:root {
  --font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --bg: #f4f7f6;
  --surface: #ffffff;
  --surface-soft: #f8faf9;
  --surface-strong: #ecf2ef;
  --text: #13231f;
  --muted: #6c7c77;
  --border: #dce6e2;

  --primary: #0b6fd3;
  --primary-hover: #05685c;
  --primary-soft: #deefff;
  --primary-ink: #064d45;

  --secondary: #00a6e8;
  --secondary-soft: #dff6ff;

  --warning: #d98213;
  --warning-soft: #fff1d8;
  --danger: #d44646;
  --danger-soft: #ffe7e7;
  --success: #21845b;
  --success-soft: #e1f6ea;

  --shadow-sm: 0 6px 20px rgba(24, 58, 48, .06);
  --shadow-md: 0 18px 55px rgba(24, 58, 48, .10);
  --shadow-lg: 0 30px 80px rgba(15, 38, 31, .18);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-xl: 28px;

  --sidebar-width: 260px;
  --topbar-height: 84px;
}

html[data-theme="dark"] {
  --bg: #0e1714;
  --surface: #15211d;
  --surface-soft: #192823;
  --surface-strong: #22342e;
  --text: #ecf6f2;
  --muted: #9eb0aa;
  --border: #2d423b;

  --primary: #65d5c3;
  --primary-hover: #7de0d0;
  --primary-soft: #193d36;
  --primary-ink: #b9f5e9;

  --secondary: #b9a4ff;
  --secondary-soft: #332d50;

  --warning-soft: #45351c;
  --danger-soft: #442326;
  --success-soft: #1c3c2f;

  --shadow-sm: 0 8px 24px rgba(0, 0, 0, .18);
  --shadow-md: 0 22px 60px rgba(0, 0, 0, .28);
  --shadow-lg: 0 34px 90px rgba(0, 0, 0, .42);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 15px;
  color: var(--text);
  background:
    radial-gradient(circle at 92% 3%, rgba(74, 194, 169, .14), transparent 30%),
    radial-gradient(circle at 62% 28%, rgba(111, 85, 199, .08), transparent 28%),
    var(--bg);
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
}

[hidden] {
  display: none !important;
}

.app {
  min-height: 100vh;
}

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 50;
  width: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 26px 18px;
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  border-right: 1px solid var(--border);
  backdrop-filter: blur(20px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 10px 10px;
}

.brand-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  color: #fff;
  font-size: 22px;
  font-weight: 800;
  border-radius: 15px;
  background: linear-gradient(145deg, #0a8676, #075d54);
  box-shadow: 0 12px 25px rgba(8, 121, 107, .27);
}

.brand strong,
.brand span {
  display: block;
}

.brand strong {
  font-size: 21px;
  letter-spacing: -.03em;
}

.brand span {
  margin-top: 2px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.nav {
  display: grid;
  gap: 5px;
  overflow: auto;
  padding-right: 2px;
}

.nav-item {
  width: 100%;
  min-height: 48px;
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 10px 13px;
  border: 0;
  border-radius: 14px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  text-align: left;
  transition: transform .18s ease, color .18s ease, background .18s ease;
}

.nav-item:hover {
  color: var(--primary);
  background: var(--surface-strong);
  transform: translateX(2px);
}

.nav-item.active {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), #09665d);
  box-shadow: 0 12px 28px rgba(8, 121, 107, .22);
}

html[data-theme="dark"] .nav-item.active {
  color: #0d2822;
  background: linear-gradient(135deg, #75decd, #56c5b3);
}

.nav-item span:last-child {
  font-size: 14px;
  font-weight: 700;
}

.nav-icon,
.icon {
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
}

.nav-icon svg,
.icon svg,
[data-icon] svg {
  width: 100%;
  height: 100%;
  display: block;
}

.sidebar-card {
  margin-top: auto;
  padding: 17px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .55);
  border-radius: 20px;
  color: #fff;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, .12), transparent),
    linear-gradient(135deg, #0b7569, #07554e);
  box-shadow: 0 18px 42px rgba(8, 96, 86, .23);
}

.sidebar-card::after {
  content: "";
  position: absolute;
}

.sidebar-card strong {
  display: block;
  margin: 7px 0 14px;
  font-size: 21px;
}

.sidebar-card .eyebrow {
  color: rgba(255, 255, 255, .72);
}

.logout-button {
  margin-top: -8px;
  color: var(--muted);
}

.logout-button:hover {
  color: var(--danger);
  background: var(--danger-soft);
}

.workspace {
  min-height: 100vh;
  margin-left: var(--sidebar-width);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 30px;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  backdrop-filter: blur(20px);
}

.topbar-left,
.topbar-actions {
  display: flex;
  align-items: center;
}

.topbar-left {
  gap: 14px;
}

.topbar-left h1 {
  margin: 3px 0 0;
  font-size: 23px;
  letter-spacing: -.025em;
}

.topbar-actions {
  gap: 10px;
}

.eyebrow {
  color: var(--primary);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.search-box {
  width: min(290px, 25vw);
  height: 43px;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 14px;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  transition: border-color .18s ease, box-shadow .18s ease;
}

.search-box:focus-within {
  border-color: color-mix(in srgb, var(--primary) 55%, var(--border));
  box-shadow: 0 0 0 4px var(--primary-soft);
}

.search-box>span {
  width: 19px;
  height: 19px;
}

.search-box input {
  width: 100%;
  min-width: 0;
  color: var(--text);
  border: 0;
  outline: 0;
  background: transparent;
}

.search-box input::placeholder {
  color: var(--muted);
}

.icon-button {
  width: 43px;
  height: 43px;
  display: grid;
  place-items: center;
  padding: 11px;
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--muted);
  background: var(--surface);
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease, transform .18s ease, background .18s ease;
}

.icon-button:hover {
  color: var(--primary);
  border-color: color-mix(in srgb, var(--primary) 34%, var(--border));
  background: var(--primary-soft);
  transform: translateY(-1px);
}

.notification-button {
  position: relative;
}

.notification-button i {
  position: absolute;
  top: 9px;
  right: 9px;
  width: 8px;
  height: 8px;
  border: 2px solid var(--surface);
  border-radius: 50%;
  background: var(--danger);
}

.profile-chip {
  height: 47px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 5px 8px 5px 5px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  cursor: pointer;
}

.profile-chip>[data-icon] {
  width: 17px;
  height: 17px;
  color: var(--muted);
}

.avatar {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  color: #fff;
  font-size: 12px;
  font-weight: 800;
  border-radius: 12px;
  background: linear-gradient(135deg, #00a6e8, #9f8de0);
}

.profile-copy {
  display: grid;
  gap: 1px;
  text-align: left;
}

.profile-copy strong {
  font-size: 12px;
}

.profile-copy small {
  color: var(--muted);
  font-size: 10px;
}

.mobile-menu-button {
  display: none;
}

.mobile-overlay {
  display: none;
}

.content {
  width: min(1440px, 100%);
  margin: 0 auto;
  padding: 28px 30px 48px;
  outline: 0;
}

.page-stack {
  display: grid;
  gap: 24px;
  animation: page-in .26s ease-out both;
}

@keyframes page-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
}

.hero {
  position: relative;
  min-height: 230px;
  display: grid;
  grid-template-columns: 1.35fr .65fr;
  align-items: center;
  gap: 30px;
  padding: 34px;
  overflow: hidden;
  border-radius: var(--radius-xl);
  color: #fff;
  background:
    radial-gradient(circle at 85% 20%, rgba(255, 255, 255, .22), transparent 28%),
    radial-gradient(circle at 70% 110%, rgba(117, 222, 205, .30), transparent 40%),
    linear-gradient(135deg, #075fbd, #087fd4 58%, #00a8df);
  box-shadow: 0 26px 65px rgba(4, 92, 83, .24);
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, .14);
}

.hero::before {
  width: 260px;
  height: 260px;
  right: -85px;
  top: -125px;
}

.hero::after {
  width: 150px;
  height: 150px;
  right: 90px;
  bottom: -95px;
}

.hero-copy,
.hero-visual {
  position: relative;
  z-index: 1;
}

.hero-copy h2 {
  max-width: 660px;
  margin: 10px 0 12px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.1;
  letter-spacing: -.045em;
}

.hero-copy p {
  max-width: 620px;
  margin: 0;
  color: rgba(255, 255, 255, .78);
  font-size: 15px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 23px;
}

.hero-visual {
  display: grid;
  place-items: center;
}

.progress-orbit {
  position: relative;
  width: 176px;
  height: 176px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: conic-gradient(#9cf0df 0 75%, rgba(255, 255, 255, .18) 75% 100%);
  box-shadow: 0 25px 60px rgba(0, 0, 0, .18);
}

.progress-orbit::before {
  content: "";
  width: 137px;
  height: 137px;
  border-radius: 50%;
  background: rgba(7, 82, 75, .92);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .14);
}

.progress-orbit div {
  position: absolute;
  z-index: 1;
  display: grid;
  text-align: center;
}

.progress-orbit strong {
  font-size: 36px;
  letter-spacing: -.05em;
}

.progress-orbit span {
  color: rgba(255, 255, 255, .7);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
}

.button {
  min-height: 43px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 17px;
  border: 1px solid transparent;
  border-radius: 13px;
  font-weight: 800;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, border-color .18s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  color: #fff;
  background: var(--primary);
  box-shadow: 0 10px 22px rgba(8, 121, 107, .20);
}

.button-primary:hover {
  background: var(--primary-hover);
}

.button-secondary {
  color: var(--secondary);
  background: var(--secondary-soft);
}

.button-ghost {
  color: var(--text);
  border-color: var(--border);
  background: var(--surface);
}

.button-ghost:hover {
  border-color: color-mix(in srgb, var(--primary) 34%, var(--border));
  background: var(--primary-soft);
}

.button-light {
  color: var(--primary-ink);
  background: #fff;
}

.button-soft {
  color: var(--primary);
  background: var(--primary-soft);
}

.button-danger {
  color: var(--danger);
  background: var(--danger-soft);
}

.button-small {
  min-height: 35px;
  padding: 0 13px;
  font-size: 12px;
  border-radius: 11px;
}

.button svg {
  width: 18px;
  height: 18px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
}

.section-head h2,
.section-head h3 {
  margin: 4px 0 0;
  letter-spacing: -.025em;
}

.section-head h2 {
  font-size: 24px;
}

.section-head h3 {
  font-size: 19px;
}

.section-head p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.section-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.stat-card,
.card {
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 96%, transparent);
  box-shadow: var(--shadow-sm);
}

.stat-card {
  position: relative;
  min-height: 142px;
  padding: 20px;
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.stat-card::after {
  content: "";
  position: absolute;
  width: 100px;
  height: 100px;
  right: -38px;
  bottom: -45px;
  border-radius: 50%;
  background: var(--stat-soft, var(--primary-soft));
}

.stat-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.stat-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  padding: 10px;
  border-radius: 13px;
  color: var(--stat-color, var(--primary));
  background: var(--stat-soft, var(--primary-soft));
}

.stat-trend {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--success);
  font-size: 11px;
  font-weight: 800;
}

.stat-card strong {
  display: block;
  margin-top: 18px;
  font-size: 27px;
  letter-spacing: -.04em;
}

.stat-card p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.grid-main {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(300px, .75fr);
  gap: 20px;
}

.card {
  padding: 22px;
  border-radius: var(--radius-lg);
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 18px;
}

.card-header h3 {
  margin: 0;
  font-size: 17px;
}

.card-header p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.course-list {
  display: grid;
  gap: 12px;
}

.course-item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) minmax(120px, 190px) 32px;
  align-items: center;
  gap: 15px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 17px;
  background: var(--surface-soft);
  cursor: pointer;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.course-item:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--primary) 38%, var(--border));
  box-shadow: var(--shadow-sm);
}

.course-thumb {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  padding: 13px;
  border-radius: 15px;
  color: var(--course-color, var(--primary));
  background: var(--course-soft, var(--primary-soft));
}

.course-copy {
  min-width: 0;
}

.course-copy strong {
  display: block;
  overflow: hidden;
  font-size: 13px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.course-copy span {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 11px;
}

.badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 24px;
  padding: 0 9px;
  border-radius: 999px;
  color: var(--badge-color, var(--primary));
  background: var(--badge-soft, var(--primary-soft));
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.progress-block {
  display: grid;
  gap: 7px;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
}

.progress-meta strong {
  color: var(--text);
}

.progress-track {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface-strong);
}

.progress-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), #67d6c3);
}

.chevron {
  width: 20px;
  height: 20px;
  color: var(--muted);
}

.mini-calendar {
  display: grid;
  gap: 16px;
}

.calendar-row {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
}

.date-box {
  width: 48px;
  height: 52px;
  display: grid;
  place-items: center;
  align-content: center;
  border-radius: 14px;
  color: var(--primary);
  background: var(--primary-soft);
}

.date-box strong {
  font-size: 17px;
}

.date-box span {
  font-size: 9px;
  font-weight: 800;
  text-transform: uppercase;
}

.calendar-copy strong {
  display: block;
  font-size: 12px;
}

.calendar-copy span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 10px;
}

.streak-card {
  padding: 18px;
  border-radius: 18px;
  color: #fff;
  background: linear-gradient(135deg, #116ec6, #23b9ed);
}

.streak-card strong {
  display: block;
  margin-top: 8px;
  font-size: 24px;
}

.streak-days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
  margin-top: 15px;
}

.streak-day {
  display: grid;
  gap: 5px;
  color: rgba(255, 255, 255, .7);
  font-size: 9px;
  text-align: center;
}

.streak-day i {
  width: 100%;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 9px;
  background: rgba(255, 255, 255, .14);
}

.streak-day.active i {
  color: #664eae;
  background: #fff;
}

.segmented {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-strong);
}

.segmented button {
  min-height: 34px;
  padding: 0 13px;
  border: 0;
  border-radius: 10px;
  color: var(--muted);
  background: transparent;
  font-size: 11px;
  font-weight: 800;
  cursor: pointer;
}

.segmented button.active {
  color: var(--primary);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.upload-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, .75fr);
  gap: 20px;
}

.upload-zone {
  min-height: 360px;
  display: grid;
  place-items: center;
  padding: 30px;
  border: 2px dashed color-mix(in srgb, var(--primary) 38%, var(--border));
  border-radius: 22px;
  background:
    radial-gradient(circle at 50% 25%, var(--primary-soft), transparent 43%),
    var(--surface-soft);
  text-align: center;
  cursor: pointer;
  transition: border-color .18s ease, transform .18s ease, background .18s ease;
}

.upload-zone:hover,
.upload-zone.dragging {
  transform: translateY(-2px);
  border-color: var(--primary);
  background:
    radial-gradient(circle at 50% 25%, color-mix(in srgb, var(--primary-soft) 74%, transparent), transparent 48%),
    var(--surface);
}

.upload-icon {
  width: 78px;
  height: 78px;
  display: grid;
  place-items: center;
  margin: 0 auto 18px;
  padding: 20px;
  border-radius: 23px;
  color: var(--primary);
  background: var(--primary-soft);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--primary) 16%, transparent);
}

.upload-zone h3 {
  margin: 0;
  font-size: 20px;
}

.upload-zone p {
  max-width: 450px;
  margin: 10px auto 18px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

.upload-zone input {
  display: none;
}

.preview-image {
  max-height: 270px;
  margin: 0 auto 18px;
  border-radius: 17px;
  box-shadow: var(--shadow-md);
  object-fit: contain;
}

.solve-options {
  display: grid;
  gap: 14px;
}

.option-card {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 17px;
  background: var(--surface-soft);
}

.option-card h4 {
  margin: 0 0 12px;
  font-size: 13px;
}

.radio-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9px;
}

.choice {
  position: relative;
  display: block;
  cursor: pointer;
}

.choice input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.choice span {
  min-height: 46px;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 13px;
  color: var(--muted);
  background: var(--surface);
  font-size: 12px;
  font-weight: 800;
  transition: border-color .18s ease, color .18s ease, background .18s ease;
}

.choice input:checked+span {
  color: var(--primary);
  border-color: var(--primary);
  background: var(--primary-soft);
}

.solve-result {
  display: grid;
  gap: 17px;
}

.solution-step {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 14px;
  border-radius: 15px;
  background: var(--surface-soft);
}

.solution-step>strong {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  color: var(--primary);
  border-radius: 11px;
  background: var(--primary-soft);
}

.solution-step h4 {
  margin: 0;
  font-size: 13px;
}

.solution-step p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.65;
}

.wallet-grid {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(360px, 1.1fr);
  gap: 20px;
}

.balance-card {
  min-height: 240px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 28px;
  overflow: hidden;
  border-radius: var(--radius-xl);
  color: #fff;
  background:
    radial-gradient(circle at 100% 0, rgba(255, 255, 255, .25), transparent 30%),
    linear-gradient(135deg, #0b6fd3, #075fbd 58%, #00a8df);
  box-shadow: 0 26px 65px rgba(5, 91, 82, .22);
}

.balance-card h2 {
  margin: 9px 0 0;
  font-size: 39px;
  letter-spacing: -.05em;
}

.balance-meta {
  display: flex;
  gap: 22px;
}

.balance-meta div {
  display: grid;
  gap: 4px;
}

.balance-meta span {
  color: rgba(255, 255, 255, .66);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .1em;
}

.balance-meta strong {
  font-size: 13px;
}

.amount-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 9px;
}

.amount-button {
  min-height: 52px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: 13px;
  color: var(--text);
  background: var(--surface);
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
}

.amount-button.active {
  color: var(--primary);
  border-color: var(--primary);
  background: var(--primary-soft);
}

.field {
  display: grid;
  gap: 7px;
}

.field label,
.field>span {
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
}

.input,
.select,
.textarea {
  width: 100%;
  min-height: 46px;
  padding: 0 13px;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 13px;
  outline: 0;
  background: var(--surface);
  transition: border-color .18s ease, box-shadow .18s ease;
}

.textarea {
  min-height: 110px;
  padding-top: 12px;
  resize: vertical;
}

.input:focus,
.select:focus,
.textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-soft);
}

.secret-input-control {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: stretch;
  gap: 8px;
}

.secret-visibility-toggle {
  min-width: 64px;
  padding: 0 14px;
  color: var(--primary);
  border: 1px solid var(--border);
  border-radius: 13px;
  background: var(--surface);
  font: inherit;
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
  transition: border-color .18s ease, box-shadow .18s ease, background .18s ease;
}

.secret-visibility-toggle:hover {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.secret-visibility-toggle:focus-visible {
  outline: 0;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-soft);
}

.payment-methods {
  display: grid;
  gap: 9px;
}

.payment-method {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) 22px;
  align-items: center;
  gap: 12px;
  padding: 13px;
  border: 1px solid var(--border);
  border-radius: 15px;
  background: var(--surface-soft);
  cursor: pointer;
}

.payment-method.active {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.payment-logo {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: var(--method-color, var(--primary));
  background: var(--surface);
  font-weight: 900;
}

.payment-method strong {
  display: block;
  font-size: 12px;
}

.payment-method span {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 10px;
}

.radio-dot {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-radius: 50%;
}

.payment-method.active .radio-dot {
  border: 5px solid var(--primary);
}

.affiliate-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, .8fr);
  gap: 20px;
}

.referral-card {
  padding: 28px;
  border-radius: var(--radius-xl);
  color: #fff;
  background:
    radial-gradient(circle at 88% 10%, rgba(255, 255, 255, .22), transparent 32%),
    linear-gradient(135deg, #075fbd, #00a8df);
  box-shadow: 0 24px 60px rgba(82, 59, 150, .22);
}

.referral-card h2 {
  margin: 9px 0 8px;
  font-size: 28px;
  letter-spacing: -.04em;
}

.referral-card p {
  margin: 0;
  color: rgba(255, 255, 255, .74);
  font-size: 13px;
  line-height: 1.65;
}

.referral-field {
  display: flex;
  gap: 8px;
  margin-top: 20px;
  padding: 7px;
  border-radius: 15px;
  background: rgba(255, 255, 255, .12);
  border: 1px solid rgba(255, 255, 255, .18);
}

.referral-field input {
  min-width: 0;
  flex: 1;
  color: #fff;
  border: 0;
  outline: 0;
  background: transparent;
}

.referral-field input::selection {
  background: rgba(255, 255, 255, .25);
}

.ranking-card {
  display: grid;
  place-items: center;
  padding: 24px;
  text-align: center;
}

.rank-circle {
  width: 120px;
  height: 120px;
  display: grid;
  place-items: center;
  align-content: center;
  border-radius: 50%;
  color: var(--warning);
  background: var(--warning-soft);
  box-shadow: inset 0 0 0 10px color-mix(in srgb, var(--surface) 55%, transparent);
}

.rank-circle strong {
  font-size: 31px;
}

.rank-circle span {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 17px;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

th,
td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

th {
  color: var(--muted);
  background: var(--surface-soft);
  font-size: 10px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

td {
  font-size: 12px;
}

tbody tr:last-child td {
  border-bottom: 0;
}

tbody tr:hover {
  background: var(--surface-soft);
}

.user-cell {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-cell .avatar {
  width: 34px;
  height: 34px;
  border-radius: 11px;
}

.user-cell strong,
.user-cell span {
  display: block;
}

.user-cell strong {
  font-size: 12px;
}

.user-cell span {
  margin-top: 3px;
  color: var(--muted);
  font-size: 10px;
}

.status {
  display: inline-flex;
  min-height: 25px;
  align-items: center;
  padding: 0 9px;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 800;
}

.status.success {
  color: var(--success);
  background: var(--success-soft);
}

.status.pending {
  color: var(--warning);
  background: var(--warning-soft);
}

.status.failed {
  color: var(--danger);
  background: var(--danger-soft);
}

.history-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.history-toolbar .input,
.history-toolbar .select {
  width: auto;
  min-width: 180px;
}

.activity-list {
  display: grid;
}

.activity-item {
  display: grid;
  grid-template-columns: 43px minmax(0, 1fr) auto;
  align-items: center;
  gap: 13px;
  padding: 15px 0;
  border-bottom: 1px solid var(--border);
}

.activity-item:last-child {
  border-bottom: 0;
}

.activity-icon {
  width: 43px;
  height: 43px;
  display: grid;
  place-items: center;
  padding: 11px;
  color: var(--activity-color, var(--primary));
  border-radius: 13px;
  background: var(--activity-soft, var(--primary-soft));
}

.activity-copy strong {
  display: block;
  font-size: 12px;
}

.activity-copy span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 10px;
}

.activity-value {
  text-align: right;
}

.activity-value strong,
.activity-value span {
  display: block;
}

.activity-value strong {
  font-size: 12px;
}

.activity-value span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 10px;
}

.connection-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.connection-card {
  display: grid;
  gap: 18px;
  padding: 21px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.connection-head {
  display: flex;
  justify-content: space-between;
  gap: 14px;
}

.provider-logo {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 15px;
  color: var(--provider-color, var(--primary));
  background: var(--provider-soft, var(--primary-soft));
  font-size: 17px;
  font-weight: 900;
}

.connection-card h3 {
  margin: 0;
  font-size: 15px;
}

.connection-card p {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.6;
}

.connection-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 10px;
}

.settings-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 20px;
}

.settings-nav {
  display: grid;
  align-content: start;
  gap: 5px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.settings-nav button {
  min-height: 43px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 12px;
  border: 0;
  border-radius: 12px;
  color: var(--muted);
  background: transparent;
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
  text-align: left;
}

.settings-nav button.active {
  color: var(--primary);
  background: var(--primary-soft);
}

.settings-nav button [data-icon] {
  width: 18px;
  height: 18px;
}

.settings-panel {
  display: grid;
  gap: 18px;
}

.profile-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.profile-avatar-large {
  width: 76px;
  height: 76px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  color: #fff;
  border-radius: 24px;
  background: linear-gradient(135deg, #00a6e8, #9f8de0);
  font-size: 21px;
  font-weight: 900;
}

.profile-header h3 {
  margin: 0;
  font-size: 18px;
}

.profile-header p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 11px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 15px 0;
  border-bottom: 1px solid var(--border);
}

.setting-row:last-child {
  border-bottom: 0;
}

.setting-row strong {
  display: block;
  font-size: 12px;
}

.setting-row p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.55;
}

.switch {
  position: relative;
  width: 45px;
  height: 26px;
  flex: 0 0 auto;
}

.switch input {
  position: absolute;
  opacity: 0;
}

.switch span {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: var(--surface-strong);
  cursor: pointer;
  transition: background .18s ease;
}

.switch span::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  left: 3px;
  top: 3px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 3px 9px rgba(0, 0, 0, .16);
  transition: transform .18s ease;
}

.switch input:checked+span {
  background: var(--primary);
}

.switch input:checked+span::after {
  transform: translateX(19px);
}

.course-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(340px, .8fr);
  gap: 20px;
}

.course-cover {
  min-height: 310px;
  display: flex;
  align-items: flex-end;
  padding: 28px;
  overflow: hidden;
  border-radius: var(--radius-xl);
  color: #fff;
  background:
    radial-gradient(circle at 80% 20%, rgba(255, 255, 255, .20), transparent 25%),
    linear-gradient(135deg, #0c7368, #094b47 60%, #3c2d79);
  box-shadow: var(--shadow-md);
}

.course-cover h2 {
  max-width: 630px;
  margin: 10px 0 9px;
  font-size: 34px;
  letter-spacing: -.045em;
}

.course-cover p {
  max-width: 640px;
  margin: 0;
  color: rgba(255, 255, 255, .75);
  font-size: 13px;
  line-height: 1.7;
}

.course-info-card {
  display: grid;
  gap: 16px;
}

.info-row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.info-row:last-of-type {
  border-bottom: 0;
}

.info-row span {
  color: var(--muted);
  font-size: 11px;
}

.info-row strong {
  font-size: 11px;
  text-align: right;
}

.lesson-list {
  display: grid;
  gap: 9px;
}

.lesson-item {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 15px;
  background: var(--surface-soft);
}

.lesson-number {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  color: var(--primary);
  border-radius: 12px;
  background: var(--primary-soft);
  font-size: 11px;
  font-weight: 900;
}

.lesson-item strong {
  display: block;
  font-size: 12px;
}

.lesson-item span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 10px;
}

.popover-wrap {
  position: relative;
}

.popover {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  z-index: 80;
  width: min(360px, calc(100vw - 28px));
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow-lg);
  animation: popover-in .16s ease-out both;
}

@keyframes popover-in {
  from {
    opacity: 0;
    transform: translateY(-6px) scale(.98);
  }
}

.popover-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px;
}

.text-button {
  padding: 0;
  border: 0;
  color: var(--primary);
  background: transparent;
  font-size: 10px;
  font-weight: 800;
  cursor: pointer;
}

.notification-item {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 10px;
  padding: 11px;
  border-radius: 13px;
}

.notification-item:hover {
  background: var(--surface-soft);
}

.notification-item .activity-icon {
  width: 38px;
  height: 38px;
  border-radius: 12px;
}

.notification-item strong {
  display: block;
  font-size: 11px;
}

.notification-item span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.5;
}

.toast-stack {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 200;
  display: grid;
  gap: 9px;
  pointer-events: none;
}

.toast {
  width: min(350px, calc(100vw - 32px));
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 15px;
  background: var(--surface);
  box-shadow: var(--shadow-lg);
  animation: toast-in .22s ease-out both;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
}

.toast .activity-icon {
  width: 34px;
  height: 34px;
  border-radius: 11px;
}

.toast strong {
  display: block;
  font-size: 11px;
}

.toast span {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 10px;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(8, 19, 16, .55);
  backdrop-filter: blur(6px);
}

.modal {
  width: min(520px, 100%);
  max-height: calc(100vh - 36px);
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 23px;
  background: var(--surface);
  box-shadow: var(--shadow-lg);
  animation: modal-in .2s ease-out both;
}

@keyframes modal-in {
  from {
    opacity: 0;
    transform: translateY(12px) scale(.98);
  }
}

.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 15px;
  padding: 22px 22px 14px;
}

.modal-header h2 {
  margin: 4px 0 0;
  font-size: 21px;
}

.modal-body {
  padding: 4px 22px 22px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 9px;
  padding: 15px 22px 22px;
  border-top: 1px solid var(--border);
}

.empty-state {
  display: grid;
  place-items: center;
  min-height: 240px;
  padding: 30px;
  color: var(--muted);
  text-align: center;
}

.empty-state>div {
  max-width: 380px;
}

.empty-icon {
  width: 62px;
  height: 62px;
  display: grid;
  place-items: center;
  margin: 0 auto 14px;
  padding: 16px;
  color: var(--primary);
  border-radius: 18px;
  background: var(--primary-soft);
}

.empty-state h3 {
  margin: 0;
  color: var(--text);
}

.empty-state p {
  margin: 8px 0 0;
  font-size: 12px;
  line-height: 1.65;
}

@media (max-width: 1180px) {
  :root {
    --sidebar-width: 228px;
  }

  .profile-copy {
    display: none;
  }

  .profile-chip {
    padding-right: 5px;
  }

  .grid-main,
  .upload-layout,
  .wallet-grid,
  .affiliate-hero,
  .course-hero {
    grid-template-columns: 1fr;
  }

  .connection-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 940px) {
  .sidebar {
    transform: translateX(-102%);
    transition: transform .24s ease;
    box-shadow: var(--shadow-lg);
  }

  body.menu-open .sidebar {
    transform: translateX(0);
  }

  .mobile-overlay {
    position: fixed;
    inset: 0;
    z-index: 45;
    display: block;
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    background: rgba(9, 20, 17, .50);
    transition: opacity .2s ease, visibility .2s ease;
  }

  body.menu-open .mobile-overlay {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
  }

  .workspace {
    margin-left: 0;
  }

  .mobile-menu-button {
    display: grid;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .settings-layout {
    grid-template-columns: 1fr;
  }

  .settings-nav {
    grid-template-columns: repeat(4, 1fr);
  }

  .settings-nav button {
    justify-content: center;
  }

  .settings-nav button span:last-child {
    display: none;
  }
}

@media (max-width: 720px) {
  :root {
    --topbar-height: 72px;
  }

  .topbar {
    padding: 0 16px;
  }

  .topbar-left h1 {
    font-size: 18px;
  }

  .topbar-left .eyebrow {
    display: none;
  }

  .content {
    padding: 20px 16px 38px;
  }

  .search-box {
    display: none;
  }

  .hero {
    min-height: 0;
    grid-template-columns: 1fr;
    padding: 26px 22px;
  }

  .hero-copy h2 {
    font-size: 31px;
  }

  .hero-visual {
    display: none;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 11px;
  }

  .stat-card {
    min-height: 130px;
    padding: 16px;
  }

  .stat-card strong {
    font-size: 22px;
  }

  .course-item {
    grid-template-columns: 44px minmax(0, 1fr) 25px;
  }

  .course-thumb {
    width: 44px;
    height: 44px;
    padding: 11px;
  }

  .course-item .progress-block {
    grid-column: 1 / -1;
  }

  .section-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .connection-grid,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .settings-nav {
    grid-template-columns: repeat(2, 1fr);
  }

  .amount-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .profile-chip>[data-icon] {
    display: none;
  }
}

@media (max-width: 460px) {
  .topbar-actions {
    gap: 7px;
  }

  .topbar .icon-button,
  .profile-chip {
    width: 39px;
    height: 39px;
    border-radius: 12px;
  }

  .profile-chip {
    padding: 3px;
  }

  .profile-chip .avatar {
    width: 31px;
    height: 31px;
    border-radius: 10px;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions,
  .section-actions {
    width: 100%;
  }

  .hero-actions .button,
  .section-actions .button {
    flex: 1;
  }

  .radio-grid {
    grid-template-columns: 1fr;
  }
}

/* Shared dimensions for icons created dynamically by app.js. */
[data-icon-name] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

[data-icon-name]:not(.nav-icon):not(.icon):not(.chevron) {
  width: 1em;
  height: 1em;
}

[data-icon-name] svg {
  width: 100%;
  height: 100%;
  display: block;
}

.icon-button [data-icon-name] {
  width: 20px;
  height: 20px;
}

.stat-icon>[data-icon-name],
.course-thumb>[data-icon-name],
.activity-icon>[data-icon-name],
.upload-icon>[data-icon-name],
.payment-logo>[data-icon-name],
.lesson-number>[data-icon-name],
.empty-icon>[data-icon-name] {
  width: 100%;
  height: 100%;
}

.stat-trend .icon {
  width: 14px;
  height: 14px;
}


/* Standalone/runtime safeguards */
[data-icon-name] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

[data-icon-name]>svg {
  width: 100%;
  height: 100%;
}

button:disabled {
  cursor: not-allowed;
  opacity: 1;
}


/* Question solver: lấy câu hỏi từ môn học thay cho tải ảnh */
.question-solver-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(340px, .65fr);
  gap: 20px;
  align-items: start;
}

.question-browser,
.solve-control-panel {
  min-width: 0;
}

.solve-control-panel {
  position: sticky;
  top: calc(var(--topbar-height) + 20px);
  display: grid;
  gap: 14px;
}

.source-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

.source-tabs button {
  min-height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 16px;
  border: 1px solid var(--border);
  border-radius: 15px;
  color: var(--muted);
  background: var(--surface-soft);
  font-weight: 800;
  cursor: pointer;
  transition: .18s ease;
}

.source-tabs button:hover {
  color: var(--primary);
  border-color: color-mix(in srgb, var(--primary) 40%, var(--border));
}

.source-tabs button.active {
  color: var(--primary);
  border-color: var(--primary);
  background: var(--primary-soft);
  box-shadow: 0 8px 22px rgba(8, 121, 107, .10);
}

.source-tabs button [data-icon-name] {
  width: 20px;
  height: 20px;
}

.learning-path-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.learning-path-wide {
  grid-column: 1 / -1;
}

.lesson-source-card {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr) auto;
  align-items: center;
  gap: 13px;
  margin-top: 16px;
  padding: 14px;
  border: 1px solid color-mix(in srgb, var(--primary) 24%, var(--border));
  border-radius: 16px;
  background: linear-gradient(135deg, var(--primary-soft), var(--surface-soft));
}

.lesson-source-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  padding: 12px;
  color: var(--primary);
  border-radius: 14px;
  background: var(--surface);
}

.lesson-source-card strong,
.lesson-source-card p {
  display: block;
}

.lesson-source-card strong {
  margin-top: 4px;
  font-size: 13px;
}

.lesson-source-card p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 10px;
}

.question-list-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px;
  margin: 22px 0 12px;
}

.question-list-head h3 {
  margin: 0;
  font-size: 16px;
}

.question-list-head p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 11px;
}

.question-count {
  flex: 0 0 auto;
  color: var(--primary);
  font-size: 11px;
  font-weight: 800;
}

.question-bank-list {
  display: grid;
  gap: 9px;
}

.question-bank-item {
  width: 100%;
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 12px;
  padding: 13px;
  border: 1px solid var(--border);
  border-radius: 15px;
  color: var(--text);
  background: var(--surface-soft);
  cursor: pointer;
  text-align: left;
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}

.question-bank-item:hover {
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--primary) 38%, var(--border));
}

.question-bank-item.active {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.question-number,
.question-index {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  color: var(--primary);
  border-radius: 12px;
  background: var(--surface);
  font-size: 12px;
  font-weight: 900;
}

.question-bank-copy {
  min-width: 0;
}

.question-bank-copy strong {
  display: -webkit-box;
  margin-top: 6px;
  overflow: hidden;
  font-size: 12px;
  line-height: 1.55;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.selected-question-card {
  padding: 17px;
  border: 1px solid var(--border);
  border-radius: 17px;
  background: var(--surface-soft);
}

.selected-question-card h3 {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.65;
}

.question-choice-list {
  display: grid;
  gap: 8px;
  margin-top: 14px;
}

.question-choice-list>span {
  display: block;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--muted);
  background: var(--surface);
  font-size: 11px;
  line-height: 1.5;
}

.solve-action-stack {
  display: grid;
  gap: 9px;
}

.integration-note {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 12px;
  border-radius: 14px;
  color: var(--muted);
  background: var(--surface-soft);
}

.integration-note>span {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  padding: 6px;
  color: var(--primary);
  border-radius: 9px;
  background: var(--primary-soft);
}

.integration-note p {
  margin: 0;
  font-size: 10px;
  line-height: 1.55;
}

.answer-list {
  display: grid;
  gap: 16px;
}

.answer-card {
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface-soft);
}

.answer-card-head {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.answer-card-head h4 {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.65;
}

.answer-highlight {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  padding: 12px;
  border: 1px solid color-mix(in srgb, var(--success) 24%, var(--border));
  border-radius: 14px;
  color: var(--success);
  background: var(--success-soft);
}

.answer-highlight>span {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  padding: 8px;
  border-radius: 11px;
  background: var(--surface);
}

.answer-highlight small,
.answer-highlight strong {
  display: block;
}

.answer-highlight small {
  font-size: 9px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.answer-highlight strong {
  margin-top: 3px;
  font-size: 12px;
  color: var(--text);
}

.answer-explanation {
  margin: 13px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.65;
}

.solution-step-list {
  display: grid;
  gap: 9px;
  margin-top: 14px;
}

@media (max-width: 1180px) {
  .question-solver-layout {
    grid-template-columns: 1fr;
  }

  .solve-control-panel {
    position: static;
  }
}

@media (max-width: 640px) {

  .learning-path-grid,
  .source-tabs {
    grid-template-columns: 1fr;
  }

  .learning-path-wide {
    grid-column: auto;
  }

  .lesson-source-card {
    grid-template-columns: 42px minmax(0, 1fr);
  }

  .lesson-source-card .status {
    grid-column: 1 / -1;
    width: fit-content;
  }

  .question-bank-item {
    grid-template-columns: 34px minmax(0, 1fr);
  }

  .question-bank-item .chevron {
    display: none;
  }
}



/* Liên kết trực quan: Môn học -> Chương -> Bài học */
.learning-path-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 34px minmax(0, 1fr) 34px minmax(0, 1fr);
  align-items: end;
  gap: 8px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--primary-soft) 55%, transparent), transparent),
    var(--surface-soft);
}

.learning-path-step {
  min-width: 0;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  align-items: end;
  gap: 9px;
}

.path-step-number {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  margin-bottom: 8px;
  color: #fff;
  border-radius: 10px;
  background: var(--primary);
  font-size: 11px;
  font-weight: 900;
  box-shadow: 0 7px 16px rgba(8, 121, 107, .18);
}

.path-connector {
  position: relative;
  width: 34px;
  height: 46px;
  display: grid;
  place-items: center;
  align-self: end;
  color: var(--primary);
}

.path-connector::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--primary) 45%, var(--border));
}

.path-connector [data-icon-name] {
  position: relative;
  z-index: 1;
  width: 19px;
  height: 19px;
  padding: 3px;
  border-radius: 999px;
  background: var(--surface);
  box-shadow: 0 0 0 4px var(--surface-soft);
}

.learning-path-breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 10px;
  padding: 10px 12px;
  color: var(--muted);
  border-radius: 13px;
  background: var(--surface-strong);
  font-size: 10px;
  line-height: 1.5;
}

.learning-path-breadcrumb strong {
  color: var(--primary);
}

.learning-path-breadcrumb [data-icon-name] {
  width: 13px;
  height: 13px;
  flex: 0 0 auto;
}

@media (max-width: 1050px) {
  .learning-path-flow {
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  .learning-path-step {
    align-items: center;
  }

  .path-step-number {
    margin-bottom: 0;
  }

  .path-connector {
    width: 30px;
    height: 22px;
    margin-left: 4px;
    transform: rotate(90deg);
    align-self: auto;
  }
}

@media (max-width: 520px) {
  .learning-path-flow {
    padding: 12px;
  }

  .learning-path-step {
    grid-template-columns: 26px minmax(0, 1fr);
  }

  .path-step-number {
    width: 26px;
    height: 26px;
    border-radius: 8px;
  }
}



/* Khu vực mã QR thanh toán */
.payment-qr-panel {
  display: grid;
  grid-template-columns: minmax(190px, .72fr) minmax(0, 1.28fr);
  gap: 18px;
  align-items: center;
  margin-top: 17px;
  padding: 17px;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--primary) 30%, var(--border));
  border-radius: 19px;
  background:
    radial-gradient(circle at 0 0, color-mix(in srgb, var(--primary-soft) 70%, transparent), transparent 42%),
    var(--surface-soft);
}

.payment-qr-media {
  display: grid;
  place-items: center;
  min-height: 225px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 17px;
  background: #ffffff;
  box-shadow: var(--shadow-sm);
}

.payment-qr-image {
  width: min(100%, 230px);
  aspect-ratio: 1;
  display: block;
  object-fit: contain;
  border-radius: 12px;
}

.payment-qr-content h3 {
  margin: 6px 0 6px;
  font-size: 19px;
}

.payment-qr-content>p {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.65;
}

.payment-qr-info {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
  margin-top: 14px;
}

.payment-qr-info>div {
  min-width: 0;
  padding: 10px 11px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.payment-qr-info span,
.payment-qr-info strong {
  display: block;
}

.payment-qr-info span {
  color: var(--muted);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.payment-qr-info strong {
  margin-top: 5px;
  overflow-wrap: anywhere;
  font-size: 11px;
}

.payment-note {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  color: var(--success);
  font-size: 10px;
  font-weight: 700;
}

.payment-note [data-icon-name] {
  width: 17px;
  height: 17px;
  flex: 0 0 auto;
}

.payment-qr-modal {
  display: grid;
  grid-template-columns: minmax(190px, .8fr) minmax(0, 1.2fr);
  gap: 18px;
  align-items: center;
}

.payment-qr-modal>img {
  width: 100%;
  max-width: 260px;
  aspect-ratio: 1;
  margin: auto;
  padding: 9px;
  border: 1px solid var(--border);
  border-radius: 17px;
  background: #ffffff;
  object-fit: contain;
  box-shadow: var(--shadow-sm);
}

.payment-qr-modal-copy h3 {
  margin: 10px 0 6px;
  color: var(--text);
  font-size: 18px;
}

.payment-qr-modal-copy>p {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.6;
}

@media (max-width: 720px) {

  .payment-qr-panel,
  .payment-qr-modal {
    grid-template-columns: 1fr;
  }

  .payment-qr-media {
    min-height: auto;
  }

  .payment-qr-image {
    max-width: 250px;
  }
}

@media (max-width: 460px) {
  .payment-qr-info {
    grid-template-columns: 1fr;
  }
}



/* QR chỉ hiển thị sau khi người dùng bấm Thanh toán */
.modal:has(.payment-qr-modal-centered) {
  width: min(620px, 100%);
}

.payment-qr-modal-centered {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.payment-qr-modal-centered>img {
  width: min(360px, 82vw);
  max-width: 100%;
  aspect-ratio: 1;
  margin: 0 auto;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: #ffffff;
  object-fit: contain;
  box-shadow: var(--shadow-md);
}

.payment-qr-modal-centered .payment-qr-modal-copy {
  width: 100%;
}

.payment-qr-modal-centered .payment-qr-modal-copy h3 {
  margin: 10px 0 6px;
}

.payment-qr-modal-centered .payment-qr-modal-copy p {
  max-width: 430px;
  margin: 0 auto;
}

.payment-qr-info-centered {
  width: 100%;
  max-width: 440px;
}

@media (max-width: 520px) {
  .payment-qr-modal-centered>img {
    width: min(300px, 90vw);
  }

  .payment-qr-info-centered {
    grid-template-columns: 1fr;
  }
}



/* Sửa liên kết thẻ môn học và trang chi tiết động */
.course-cover {
  background:
    radial-gradient(circle at 80% 20%, rgba(255, 255, 255, .20), transparent 25%),
    linear-gradient(135deg, var(--course-accent, #0c7368), color-mix(in srgb, var(--course-accent, #0c7368) 68%, #102b29) 60%, #3c2d79);
}

.course-lesson-link {
  cursor: default;
}

.course-lesson-link .button {
  white-space: nowrap;
}

@media (max-width: 560px) {
  .course-lesson-link {
    grid-template-columns: 38px minmax(0, 1fr);
  }

  .course-lesson-link .button {
    grid-column: 1 / -1;
    width: 100%;
  }
}



/* ================================================================
   CMC UNIVERSITY-INSPIRED BLUE THEME
   Chỉ thay đổi màu sắc và hiệu ứng thị giác, không thay đổi dữ liệu.
   ================================================================ */

:root {
  --bg: #eaf5ff;
  --surface: #ffffff;
  --surface-soft: #f5faff;
  --surface-strong: #dceeff;
  --text: #102a43;
  --muted: #647f99;
  --border: #c8def2;

  --primary: #0b6fd3;
  --primary-hover: #085caf;
  --primary-soft: #deefff;
  --primary-ink: #084b88;

  --secondary: #00a6e8;
  --secondary-soft: #dff6ff;

  --warning: #e58a17;
  --warning-soft: #fff3dc;
  --danger: #d94a5b;
  --danger-soft: #ffe8ec;
  --success: #16805b;
  --success-soft: #e2f7ed;

  --shadow-sm: 0 8px 24px rgba(24, 103, 177, .08);
  --shadow-md: 0 20px 56px rgba(22, 91, 158, .13);
  --shadow-lg: 0 32px 86px rgba(13, 65, 118, .20);
}

html[data-theme="dark"] {
  --bg: #07182b;
  --surface: #0d2239;
  --surface-soft: #112a45;
  --surface-strong: #173754;
  --text: #edf7ff;
  --muted: #a8bfd2;
  --border: #294b68;

  --primary: #6bc5ff;
  --primary-hover: #8bd2ff;
  --primary-soft: #173e60;
  --primary-ink: #ccecff;

  --secondary: #43d5ff;
  --secondary-soft: #153c50;

  --warning-soft: #49391e;
  --danger-soft: #48262f;
  --success-soft: #173f33;

  --shadow-sm: 0 8px 28px rgba(0, 0, 0, .20);
  --shadow-md: 0 24px 64px rgba(0, 0, 0, .30);
  --shadow-lg: 0 36px 96px rgba(0, 0, 0, .44);
}

body {
  background:
    radial-gradient(circle at 88% 3%, rgba(57, 177, 245, .24), transparent 32%),
    radial-gradient(circle at 58% 24%, rgba(11, 111, 211, .10), transparent 30%),
    linear-gradient(180deg, #e6f4ff 0%, #f4faff 46%, #eaf5ff 100%);
}

html[data-theme="dark"] body {
  background:
    radial-gradient(circle at 88% 3%, rgba(43, 155, 224, .16), transparent 34%),
    radial-gradient(circle at 58% 24%, rgba(67, 213, 255, .07), transparent 30%),
    linear-gradient(180deg, #07182b 0%, #091d31 100%);
}

.sidebar {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .97), rgba(238, 248, 255, .96));
  border-right-color: #c4def3;
  box-shadow: 12px 0 34px rgba(25, 102, 171, .07);
}

html[data-theme="dark"] .sidebar {
  background:
    linear-gradient(180deg, rgba(12, 34, 57, .98), rgba(8, 26, 45, .98));
  border-right-color: var(--border);
}

.brand-mark {
  background: linear-gradient(145deg, #0872d8, #00aeea);
  box-shadow: 0 14px 30px rgba(11, 111, 211, .30);
}

.brand strong {
  color: #0a5fae;
}

html[data-theme="dark"] .brand strong {
  color: #72caff;
}

.nav-item:hover {
  color: var(--primary);
  background: #e5f2ff;
}

html[data-theme="dark"] .nav-item:hover {
  background: var(--surface-strong);
}

.nav-item.active {
  color: #ffffff;
  background: linear-gradient(135deg, #086bd0, #00a9e8);
  box-shadow: 0 14px 30px rgba(11, 111, 211, .25);
}

html[data-theme="dark"] .nav-item.active {
  color: #05213a;
  background: linear-gradient(135deg, #68c2ff, #44ddff);
}

.sidebar-card {
  border-color: rgba(255, 255, 255, .52);
  background:
    radial-gradient(circle at 100% 0%, rgba(255, 255, 255, .25), transparent 34%),
    linear-gradient(135deg, #086bc9, #00a9df);
  box-shadow: 0 20px 48px rgba(8, 103, 192, .26);
}

.topbar {
  background: color-mix(in srgb, #eef8ff 84%, transparent);
  border-bottom-color: rgba(164, 204, 237, .75);
  box-shadow: 0 8px 24px rgba(18, 95, 162, .04);
}

html[data-theme="dark"] .topbar {
  background: color-mix(in srgb, #091d31 84%, transparent);
  border-bottom-color: var(--border);
}

.search-box,
.icon-button,
.profile-chip {
  border-color: #c8def2;
  background: rgba(255, 255, 255, .92);
}

.search-box:focus-within {
  border-color: #45a8ec;
  box-shadow: 0 0 0 4px rgba(64, 168, 236, .15);
}

.card,
.stat-card,
.connection-card,
.settings-nav {
  border-color: #c9e0f3;
  background: color-mix(in srgb, #ffffff 96%, transparent);
  box-shadow: 0 10px 32px rgba(24, 103, 177, .08);
}

.card:hover,
.stat-card:hover {
  border-color: #aad2ef;
}

.hero {
  background:
    radial-gradient(circle at 85% 18%, rgba(255, 255, 255, .25), transparent 27%),
    radial-gradient(circle at 68% 112%, rgba(90, 220, 255, .34), transparent 42%),
    linear-gradient(135deg, #075fbf 0%, #087fd8 50%, #00a9dd 100%);
  box-shadow: 0 28px 70px rgba(7, 103, 190, .28);
}

.progress-orbit {
  background: conic-gradient(#8feaff 0 75%, rgba(255, 255, 255, .20) 75% 100%);
}

.progress-orbit::before {
  background: rgba(5, 83, 159, .94);
}

.button-primary {
  background: linear-gradient(135deg, #0b6fd3, #008fd5);
  box-shadow: 0 12px 26px rgba(11, 111, 211, .24);
}

.button-primary:hover {
  background: linear-gradient(135deg, #085eb7, #007dbd);
}

.button-soft,
.choice input:checked+span,
.amount-button.active,
.payment-method.active,
.settings-nav button.active,
.segmented button.active {
  color: var(--primary);
  border-color: #59aee7;
  background: #e0f1ff;
}

.progress-fill {
  background: linear-gradient(90deg, #0b6fd3, #36c8f4);
}

.streak-card {
  background:
    radial-gradient(circle at 100% 0%, rgba(255, 255, 255, .20), transparent 34%),
    linear-gradient(135deg, #116ec6, #23b9ed);
}

.balance-card {
  background:
    radial-gradient(circle at 100% 0, rgba(255, 255, 255, .27), transparent 32%),
    linear-gradient(135deg, #075fbd, #087fd4 58%, #00a8df);
  box-shadow: 0 28px 68px rgba(8, 103, 190, .25);
}

.referral-card {
  background:
    radial-gradient(circle at 88% 10%, rgba(255, 255, 255, .24), transparent 32%),
    linear-gradient(135deg, #075fbd, #1187dc 58%, #23b9ed);
  box-shadow: 0 26px 64px rgba(8, 103, 190, .24);
}

.course-cover {
  background:
    radial-gradient(circle at 80% 18%, rgba(255, 255, 255, .24), transparent 27%),
    linear-gradient(135deg, #075fbd, #087fd4 58%, #00a8df);
  box-shadow: 0 24px 60px rgba(8, 103, 190, .22);
}

.source-tabs button.active,
.question-bank-item.active {
  border-color: #43a8e8;
  background: #e0f1ff;
  box-shadow: 0 9px 24px rgba(11, 111, 211, .11);
}

.learning-path-flow {
  border-color: #bfddf4;
  background:
    linear-gradient(135deg, rgba(216, 238, 255, .86), rgba(247, 252, 255, .94));
}

.path-step-number {
  background: linear-gradient(135deg, #0b6fd3, #00a6e8);
  box-shadow: 0 8px 18px rgba(11, 111, 211, .22);
}

.path-connector {
  color: #1592df;
}

.lesson-source-card,
.payment-qr-panel {
  border-color: #bddcf3;
  background:
    linear-gradient(135deg, #e1f2ff, #f8fcff);
}

.badge {
  border: 1px solid color-mix(in srgb, currentColor 14%, transparent);
}

.input:focus,
.select:focus,
.textarea:focus {
  border-color: #3ca6e9;
  box-shadow: 0 0 0 4px rgba(60, 166, 233, .14);
}

::-webkit-scrollbar-thumb {
  background: #9bc7e7;
}

::-webkit-scrollbar-thumb:hover {
  background: #5b9fd0;
}



/* ================================================================
   BACKEND API INTEGRATION LAYER
   Chỉ bổ sung các trạng thái/biểu mẫu cần thiết để khớp WebHocV2 API.
   ================================================================ */
.api-banner {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--muted);
  background: var(--surface-soft);
  font-size: 13px;
  line-height: 1.6;
}

.api-banner.warning {
  color: var(--warning);
  border-color: color-mix(in srgb, var(--warning) 32%, var(--border));
  background: var(--warning-soft);
}

.api-banner.error {
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 32%, var(--border));
  background: var(--danger-soft);
}

.api-banner.success {
  color: var(--success);
  border-color: color-mix(in srgb, var(--success) 30%, var(--border));
  background: var(--success-soft);
}

.api-banner [data-icon-name] {
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
  margin-top: 1px;
}

.backend-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.backend-card {
  display: grid;
  gap: 15px;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 19px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.backend-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.backend-card h3 {
  margin: 0;
  font-size: 15px;
}

.backend-card p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.backend-account-list {
  display: grid;
  gap: 8px;
}

.backend-account {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-soft);
}

.backend-account strong,
.backend-account span {
  display: block;
}

.backend-account strong {
  font-size: 15px;
}

.backend-account span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.api-workflow {
  display: grid;
  gap: 14px;
}

.api-workflow-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 11px;
}

.api-result {
  overflow: auto;
  max-height: 360px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 15px;
  background: var(--surface-soft);
}

.api-result pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text);
  font: 13px/1.6 ui-monospace, SFMono-Regular, Menlo, monospace;
}

.api-question-list {
  display: grid;
  gap: 9px;
}

.api-question {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-soft);
}

.api-question strong {
  display: block;
  font-size: 14px;
  line-height: 1.55;
}

.api-question p {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.wallet-live {
  display: grid;
  grid-template-columns: minmax(0, .85fr) minmax(360px, 1.15fr);
  gap: 20px;
}

.giftcode-box {
  display: grid;
  gap: 12px;
}

.manual-topup {
  padding: 15px;
  border: 1px dashed #98c8e9;
  border-radius: 16px;
  background: #f5fbff;
}

.manual-topup h4 {
  margin: 0;
  font-size: 13px;
}

.manual-topup p {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.operation-list {
  display: grid;
  gap: 9px;
}

.operation-chip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 11px;
  border: 1px solid var(--border);
  border-radius: 13px;
  background: var(--surface-soft);
}

.operation-chip code {
  overflow: hidden;
  color: var(--primary);
  font-size: 12px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-layout {
  display: grid;
  grid-template-rows: minmax(320px, 1fr) auto;
  gap: 12px;
  min-height: 560px;
}

.chat-messages {
  display: grid;
  align-content: start;
  gap: 9px;
  overflow-y: auto;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 17px;
  background: var(--surface-soft);
}

.chat-message {
  max-width: min(76%, 620px);
  padding: 10px 12px;
  border-radius: 14px;
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.chat-message.user {
  margin-left: auto;
  color: #fff;
  background: linear-gradient(135deg, #0b6fd3, #008fd5);
}

.chat-message strong,
.chat-message span {
  display: block;
}

.chat-message strong {
  font-size: 13px;
}

.chat-message span {
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.55;
  white-space: pre-wrap;
}

.chat-message small {
  display: block;
  margin-top: 6px;
  opacity: .7;
  font-size: 12px;
}

.chat-compose {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 9px;
}

.maintenance-strip {
  position: sticky;
  top: var(--topbar-height);
  z-index: 35;
  padding: 10px 22px;
  color: #85530b;
  background: #fff2cf;
  border-bottom: 1px solid #efd69d;
  font-size: 13px;
  font-weight: 800;
  text-align: center;
}

@media (max-width: 1180px) {
  .backend-grid {
    grid-template-columns: 1fr 1fr;
  }

  .wallet-live {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 800px) {

  .backend-grid,
  .api-workflow-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .chat-compose {
    grid-template-columns: 1fr;
  }

  .chat-message {
    max-width: 90%;
  }
}



/* ================================================================
   SOFT NIGHT MODE
   Làm sáng chế độ tối để dễ nhìn ban đêm, không thay đổi bố cục/logic.
   ================================================================ */
html[data-theme="dark"] {
  color-scheme: dark;

  --bg: #1a3850;
  --surface: #24465f;
  --surface-soft: #2a4e68;
  --surface-strong: #345a73;

  --text: #f1f7fb;
  --muted: #bfd0dc;
  --border: #4a6d84;

  --primary: #66c8f5;
  --primary-hover: #83d5f8;
  --primary-soft: #315c78;
  --primary-ink: #d8f3ff;

  --secondary: #6edcf3;
  --secondary-soft: #31586a;

  --warning: #ffc46d;
  --warning-soft: #5b4930;
  --danger: #ff9aa6;
  --danger-soft: #5b3944;
  --success: #7edbb5;
  --success-soft: #315846;

  --shadow-sm: 0 8px 24px rgba(7, 27, 43, .14);
  --shadow-md: 0 20px 54px rgba(7, 27, 43, .20);
  --shadow-lg: 0 30px 78px rgba(7, 27, 43, .28);
}

html[data-theme="dark"] body {
  background:
    radial-gradient(circle at 88% 3%, rgba(76, 180, 235, .18), transparent 34%),
    radial-gradient(circle at 52% 25%, rgba(104, 199, 245, .09), transparent 30%),
    linear-gradient(180deg, #1c3d57 0%, #18374f 48%, #163349 100%);
}

html[data-theme="dark"] .sidebar {
  background:
    linear-gradient(180deg, rgba(31, 68, 95, .98), rgba(25, 58, 82, .98));
  border-right-color: #4a6d84;
  box-shadow: 12px 0 34px rgba(7, 27, 43, .10);
}

html[data-theme="dark"] .topbar {
  background: color-mix(in srgb, #21465f 88%, transparent);
  border-bottom-color: #4a6d84;
  box-shadow: 0 8px 24px rgba(7, 27, 43, .08);
}

html[data-theme="dark"] .brand strong {
  color: #87d8fb;
}

html[data-theme="dark"] .nav-item {
  color: #c6d6e1;
}

html[data-theme="dark"] .nav-item:hover {
  color: #ecf8ff;
  background: #315a75;
}

html[data-theme="dark"] .nav-item.active {
  color: #10334b;
  background: linear-gradient(135deg, #72d0f6, #55c5ed);
  box-shadow: 0 13px 28px rgba(7, 27, 43, .16);
}

html[data-theme="dark"] .search-box,
html[data-theme="dark"] .icon-button,
html[data-theme="dark"] .profile-chip,
html[data-theme="dark"] .input,
html[data-theme="dark"] .select,
html[data-theme="dark"] .textarea {
  color: var(--text);
  border-color: var(--border);
  background: #294d67;
}

html[data-theme="dark"] .search-box input,
html[data-theme="dark"] .input::placeholder,
html[data-theme="dark"] .textarea::placeholder {
  color: #a9c0cf;
}

html[data-theme="dark"] .card,
html[data-theme="dark"] .stat-card,
html[data-theme="dark"] .connection-card,
html[data-theme="dark"] .settings-nav,
html[data-theme="dark"] .backend-card,
html[data-theme="dark"] .modal {
  color: var(--text);
  border-color: var(--border);
  background: linear-gradient(145deg, #294c65, #24445c);
  box-shadow: var(--shadow-sm);
}

html[data-theme="dark"] .card:hover,
html[data-theme="dark"] .stat-card:hover {
  border-color: #638ba3;
}

html[data-theme="dark"] .settings-nav button {
  color: #bdd0dc;
}

html[data-theme="dark"] .settings-nav button:hover {
  color: var(--text);
  background: #315a75;
}

html[data-theme="dark"] .settings-nav button.active,
html[data-theme="dark"] .button-soft,
html[data-theme="dark"] .choice input:checked+span,
html[data-theme="dark"] .amount-button.active,
html[data-theme="dark"] .payment-method.active,
html[data-theme="dark"] .segmented button.active,
html[data-theme="dark"] .source-tabs button.active,
html[data-theme="dark"] .question-bank-item.active {
  color: #dff5ff;
  border-color: #67b9e2;
  background: #35647f;
}

html[data-theme="dark"] .button-ghost {
  color: var(--text);
  border-color: var(--border);
  background: #2a4e68;
}

html[data-theme="dark"] .button-ghost:hover {
  background: #345d78;
}

html[data-theme="dark"] .learning-path-flow,
html[data-theme="dark"] .lesson-source-card,
html[data-theme="dark"] .payment-qr-panel,
html[data-theme="dark"] .selected-question-card,
html[data-theme="dark"] .api-result,
html[data-theme="dark"] .api-question,
html[data-theme="dark"] .backend-account,
html[data-theme="dark"] .operation-chip,
html[data-theme="dark"] .chat-messages,
html[data-theme="dark"] .api-banner {
  color: var(--text);
  border-color: var(--border);
  background: linear-gradient(145deg, #2d526c, #294a63);
}

html[data-theme="dark"] .question-bank-item,
html[data-theme="dark"] .choice span,
html[data-theme="dark"] .amount-button,
html[data-theme="dark"] .payment-method,
html[data-theme="dark"] .setting-row,
html[data-theme="dark"] .activity-item {
  border-color: var(--border);
  background: #294d67;
}

html[data-theme="dark"] .manual-topup {
  border-color: #5f8eaa;
  background: #2b526d;
}

html[data-theme="dark"] .chat-message {
  color: var(--text);
  border: 1px solid var(--border);
  background: #315a75;
}

html[data-theme="dark"] .chat-message.user {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, #207db4, #21a7d2);
}

html[data-theme="dark"] .profile-avatar-large {
  box-shadow: 0 12px 26px rgba(7, 27, 43, .18);
}

html[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: #648ba2;
}

html[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: #79a5bd;
}



/* ================================================================
   WALLET & GIFTCODE REDESIGN + MINI MESSENGER
   ================================================================ */

.wallet-page-hero {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(260px, .75fr);
  gap: 18px;
  padding: 24px;
  color: #fff;
  border-radius: 24px;
  background:
    radial-gradient(circle at 88% 8%, rgba(255, 255, 255, .24), transparent 28%),
    radial-gradient(circle at 70% 115%, rgba(74, 220, 255, .34), transparent 42%),
    linear-gradient(135deg, #075fbd 0%, #087fd4 54%, #00a8df 100%);
  box-shadow: 0 28px 72px rgba(8, 103, 190, .25);
}

.wallet-page-hero::after {
  content: "";
  position: absolute;
  right: -55px;
  bottom: -75px;
  width: 240px;
  height: 240px;
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 50%;
  box-shadow:
    0 0 0 28px rgba(255, 255, 255, .05),
    0 0 0 58px rgba(255, 255, 255, .035);
}

.wallet-hero-main,
.wallet-hero-side {
  position: relative;
  z-index: 1;
}

.wallet-hero-main h2 {
  margin: 10px 0 5px;
  font-size: clamp(30px, 4vw, 46px);
  letter-spacing: -.05em;
}

.wallet-hero-main p {
  max-width: 570px;
  margin: 0;
  color: rgba(255, 255, 255, .78);
  font-size: 11px;
  line-height: 1.6;
}

.wallet-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 18px;
}

.wallet-hero-actions .button {
  border-color: rgba(255, 255, 255, .26);
}

.wallet-hero-actions .button-primary {
  color: #075fbd;
  background: #fff;
  box-shadow: 0 12px 28px rgba(4, 53, 102, .17);
}

.wallet-hero-actions .button-ghost {
  color: #fff;
  background: rgba(255, 255, 255, .12);
  backdrop-filter: blur(10px);
}

.wallet-hero-side {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.wallet-hero-stat {
  padding: 13px 14px;
  border: 1px solid rgba(255, 255, 255, .20);
  border-radius: 16px;
  background: rgba(255, 255, 255, .11);
  backdrop-filter: blur(12px);
}

.wallet-hero-stat span,
.wallet-hero-stat strong {
  display: block;
}

.wallet-hero-stat span {
  color: rgba(255, 255, 255, .68);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.wallet-hero-stat strong {
  margin-top: 6px;
  font-size: 14px;
}

.wallet-action-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, .75fr);
  gap: 18px;
}

.topup-card,
.giftcode-premium-card {
  position: relative;
  overflow: hidden;
}

.topup-card::before,
.giftcode-premium-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, #0b6fd3, #00a6e8);
}

.topup-title-row,
.giftcode-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.wallet-feature-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  padding: 11px;
  color: var(--primary);
  border-radius: 15px;
  background: linear-gradient(145deg, var(--primary-soft), var(--secondary-soft));
}

.topup-amount-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 9px;
  margin-top: 13px;
}

.topup-amount {
  min-height: 49px;
  padding: 0 10px;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 13px;
  background: var(--surface-soft);
  font-size: 11px;
  font-weight: 900;
  cursor: pointer;
  transition: .17s ease;
}

.topup-amount:hover {
  color: var(--primary);
  border-color: #78b8e4;
  transform: translateY(-1px);
}

.topup-amount.active {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, #0b6fd3, #00a6e8);
  box-shadow: 0 11px 24px rgba(11, 111, 211, .20);
}

.topup-payment-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 9px;
  margin-top: 9px;
}

.topup-payment {
  min-width: 0;
  display: grid;
  grid-template-columns: 35px minmax(0, 1fr);
  align-items: center;
  gap: 9px;
  min-height: 61px;
  padding: 9px;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-soft);
  text-align: left;
  cursor: pointer;
  transition: .17s ease;
}

.topup-payment:hover,
.topup-payment.active {
  border-color: #66b2e3;
  background: var(--primary-soft);
}

.topup-payment.active {
  box-shadow: inset 0 0 0 1px #66b2e3;
}

.topup-payment-logo {
  width: 35px;
  height: 35px;
  display: grid;
  place-items: center;
  padding: 8px;
  color: var(--primary);
  border-radius: 11px;
  background: #fff;
  box-shadow: var(--shadow-sm);
  font-size: 13px;
  font-weight: 900;
}

.topup-payment strong,
.topup-payment span {
  display: block;
  min-width: 0;
}

.topup-payment strong {
  overflow: hidden;
  font-size: 9px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topup-payment span {
  margin-top: 3px;
  overflow: hidden;
  color: var(--muted);
  font-size: 8px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topup-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 14px;
  padding: 12px 13px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: linear-gradient(135deg, var(--surface-soft), var(--primary-soft));
}

.topup-summary span,
.topup-summary strong {
  display: block;
}

.topup-summary span {
  color: var(--muted);
  font-size: 9px;
}

.topup-summary strong {
  margin-top: 4px;
  font-size: 16px;
}

.giftcode-premium-card {
  background:
    radial-gradient(circle at 100% 0, rgba(0, 166, 232, .12), transparent 34%),
    var(--surface);
}

.giftcode-visual {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 120px;
  margin: 15px 0;
  overflow: hidden;
  color: #fff;
  border-radius: 18px;
  background:
    radial-gradient(circle at 85% 15%, rgba(255, 255, 255, .24), transparent 26%),
    linear-gradient(135deg, #0b6fd3, #00a6e8);
}

.giftcode-visual::before,
.giftcode-visual::after {
  content: "";
  position: absolute;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--surface);
}

.giftcode-visual::before {
  left: -19px;
}

.giftcode-visual::after {
  right: -19px;
}

.giftcode-visual strong {
  position: relative;
  z-index: 1;
  font-size: 20px;
  letter-spacing: .12em;
}

.giftcode-visual span {
  position: relative;
  z-index: 1;
  margin-top: 6px;
  color: rgba(255, 255, 255, .72);
  font-size: 9px;
  letter-spacing: .09em;
  text-transform: uppercase;
}

.giftcode-input-wrap {
  position: relative;
}

.giftcode-input-wrap .input {
  min-height: 50px;
  padding-right: 46px;
  font-weight: 800;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.giftcode-input-wrap .icon {
  position: absolute;
  top: 50%;
  right: 14px;
  width: 20px;
  height: 20px;
  color: var(--primary);
  transform: translateY(-50%);
}

.wallet-help-strip {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 17px;
  background:
    linear-gradient(135deg, var(--surface), var(--surface-soft));
  box-shadow: var(--shadow-sm);
}

.wallet-help-strip h4,
.wallet-help-strip p {
  margin: 0;
}

.wallet-help-strip h4 {
  font-size: 12px;
}

.wallet-help-strip p {
  margin-top: 4px;
  color: var(--muted);
  font-size: 9px;
  line-height: 1.5;
}

/* Messenger mini */
.messenger-mini {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 175;
  pointer-events: none;
}

.messenger-fab {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  padding: 15px;
  color: #fff;
  border: 0;
  border-radius: 20px;
  background: linear-gradient(145deg, #0b6fd3, #00a6e8);
  box-shadow: 0 18px 44px rgba(7, 83, 159, .34);
  cursor: pointer;
  pointer-events: auto;
  transition: .18s ease;
}

.messenger-fab:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 22px 50px rgba(7, 83, 159, .40);
}

.messenger-fab svg {
  width: 28px;
  height: 28px;
}

.messenger-badge {
  position: absolute;
  top: -5px;
  right: -5px;
  min-width: 21px;
  height: 21px;
  display: grid;
  place-items: center;
  padding: 0 5px;
  color: #fff;
  border: 3px solid var(--surface);
  border-radius: 999px;
  background: var(--danger);
  font-size: 8px;
  font-weight: 900;
}

.messenger-panel {
  position: absolute;
  right: 0;
  bottom: 72px;
  width: min(370px, calc(100vw - 28px));
  height: min(560px, calc(100vh - 120px));
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  overflow: hidden;
  visibility: hidden;
  opacity: 0;
  border: 1px solid var(--border);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: 0 30px 90px rgba(8, 55, 100, .28);
  pointer-events: auto;
  transform: translateY(14px) scale(.97);
  transform-origin: bottom right;
  transition: .2s ease;
}

.messenger-mini.open .messenger-panel {
  visibility: visible;
  opacity: 1;
  transform: translateY(0) scale(1);
}

.messenger-mini.open .messenger-fab {
  opacity: 0;
  pointer-events: none;
  transform: scale(.82);
}

.messenger-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 15px;
  color: #fff;
  background:
    radial-gradient(circle at 100% 0, rgba(255, 255, 255, .20), transparent 32%),
    linear-gradient(135deg, #075fbd, #00a6e8);
}

.messenger-admin {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.messenger-admin-avatar {
  position: relative;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border: 1px solid rgba(255, 255, 255, .32);
  border-radius: 14px;
  background: rgba(255, 255, 255, .18);
  font-size: 12px;
  font-weight: 900;
}

.messenger-online-dot {
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 11px;
  height: 11px;
  border: 2px solid #087fd4;
  border-radius: 50%;
  background: #63e6ae;
}

.messenger-admin strong,
.messenger-admin span {
  display: block;
}

.messenger-admin strong {
  font-size: 12px;
}

.messenger-admin span {
  margin-top: 3px;
  color: rgba(255, 255, 255, .72);
  font-size: 8px;
}

.messenger-head-actions {
  display: flex;
  gap: 5px;
}

.messenger-icon-button {
  width: 33px;
  height: 33px;
  display: grid;
  place-items: center;
  padding: 8px;
  color: #fff;
  border: 0;
  border-radius: 11px;
  background: rgba(255, 255, 255, .13);
  cursor: pointer;
}

.messenger-messages {
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 15px;
  background:
    radial-gradient(circle at 100% 0, rgba(0, 166, 232, .07), transparent 28%),
    var(--surface-soft);
}

.mini-message-row {
  display: flex;
  align-items: flex-end;
  gap: 7px;
}

.mini-message-row.user {
  justify-content: flex-end;
}

.mini-message-bubble {
  max-width: 79%;
  padding: 9px 11px;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 15px 15px 15px 5px;
  background: var(--surface);
  box-shadow: 0 6px 17px rgba(24, 103, 177, .05);
}

.mini-message-row.user .mini-message-bubble {
  color: #fff;
  border-color: transparent;
  border-radius: 15px 15px 5px 15px;
  background: linear-gradient(135deg, #0b6fd3, #00a6e8);
}

.mini-message-bubble p {
  margin: 0;
  overflow-wrap: anywhere;
  font-size: 10px;
  line-height: 1.55;
  white-space: pre-wrap;
}

.mini-message-bubble time {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 7px;
}

.mini-message-row.user .mini-message-bubble time {
  color: rgba(255, 255, 255, .68);
  text-align: right;
}

.messenger-welcome {
  margin: auto;
  padding: 20px;
  color: var(--muted);
  text-align: center;
}

.messenger-welcome .wallet-feature-icon {
  margin: 0 auto 10px;
}

.messenger-welcome strong {
  display: block;
  color: var(--text);
  font-size: 12px;
}

.messenger-welcome p {
  margin: 7px 0 0;
  font-size: 9px;
  line-height: 1.55;
}

.messenger-compose {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 42px;
  align-items: end;
  gap: 8px;
  padding: 11px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.messenger-compose textarea {
  min-height: 42px;
  max-height: 105px;
  padding: 11px 12px;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 14px;
  outline: 0;
  background: var(--surface-soft);
  resize: none;
}

.messenger-compose textarea:focus {
  border-color: #57ace2;
  box-shadow: 0 0 0 3px rgba(60, 166, 233, .13);
}

.messenger-send {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  padding: 11px;
  color: #fff;
  border: 0;
  border-radius: 14px;
  background: linear-gradient(135deg, #0b6fd3, #00a6e8);
  cursor: pointer;
}

.messenger-send:disabled {
  opacity: 1;
  color: #405d73;
  border: 1px solid #afc4d5;
  background: #dce7f0;
  box-shadow: none;
  cursor: wait;
}

html[data-theme="dark"] .wallet-help-strip,
html[data-theme="dark"] .topup-payment,
html[data-theme="dark"] .topup-amount,
html[data-theme="dark"] .topup-summary {
  border-color: var(--border);
  background: #294d67;
}

html[data-theme="dark"] .topup-payment-logo {
  color: #dff5ff;
  background: #345d78;
}

html[data-theme="dark"] .topup-amount.active {
  color: #10334b;
  background: linear-gradient(135deg, #72d0f6, #55c5ed);
}

html[data-theme="dark"] .giftcode-visual::before,
html[data-theme="dark"] .giftcode-visual::after {
  background: #24465f;
}

html[data-theme="dark"] .messenger-panel {
  background: #24465f;
}

html[data-theme="dark"] .messenger-messages {
  background:
    radial-gradient(circle at 100% 0, rgba(96, 203, 246, .09), transparent 28%),
    #203f57;
}

html[data-theme="dark"] .mini-message-bubble {
  background: #2b526d;
}

@media (max-width: 980px) {

  .wallet-page-hero,
  .wallet-action-grid {
    grid-template-columns: 1fr;
  }

  .wallet-hero-side {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 680px) {
  .wallet-page-hero {
    padding: 19px;
  }

  .wallet-hero-side,
  .topup-amount-grid,
  .topup-payment-list {
    grid-template-columns: 1fr;
  }

  .wallet-help-strip {
    grid-template-columns: 42px minmax(0, 1fr);
  }

  .wallet-help-strip .button {
    grid-column: 1 / -1;
    width: 100%;
  }

  .messenger-mini {
    right: 14px;
    bottom: 14px;
  }

  .messenger-panel {
    position: fixed;
    inset: 10px;
    width: auto;
    height: auto;
    max-height: none;
    border-radius: 20px;
    transform-origin: bottom right;
  }
}



/* ================================================================
   SUPPORT GUIDE LIBRARY + DRAGGABLE ASSISTANT
   ================================================================ */

.support-library-hero {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, .65fr);
  align-items: center;
  gap: 22px;
  padding: 27px;
  color: #fff;
  border-radius: 25px;
  background:
    radial-gradient(circle at 86% 10%, rgba(255, 255, 255, .24), transparent 26%),
    radial-gradient(circle at 72% 116%, rgba(84, 223, 255, .32), transparent 42%),
    linear-gradient(135deg, #075fbd 0%, #087fd4 56%, #00a8df 100%);
  box-shadow: 0 28px 72px rgba(8, 103, 190, .24);
}

.support-library-hero::after {
  content: "";
  position: absolute;
  right: -62px;
  bottom: -88px;
  width: 250px;
  height: 250px;
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 50%;
  box-shadow:
    0 0 0 30px rgba(255, 255, 255, .05),
    0 0 0 62px rgba(255, 255, 255, .035);
}

.support-hero-copy,
.support-hero-preview {
  position: relative;
  z-index: 1;
}

.support-hero-copy h2 {
  max-width: 650px;
  margin: 9px 0 8px;
  font-size: clamp(26px, 4vw, 42px);
  letter-spacing: -.045em;
}

.support-hero-copy p {
  max-width: 620px;
  margin: 0;
  color: rgba(255, 255, 255, .78);
  font-size: 11px;
  line-height: 1.7;
}

.support-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 19px;
}

.support-hero-actions .button-primary {
  color: #075fbd;
  background: #fff;
  box-shadow: 0 12px 28px rgba(4, 53, 102, .17);
}

.support-hero-actions .button-ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, .28);
  background: rgba(255, 255, 255, .12);
  backdrop-filter: blur(10px);
}

.support-hero-preview {
  display: grid;
  gap: 10px;
}

.support-preview-card {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: center;
  gap: 11px;
  padding: 13px;
  border: 1px solid rgba(255, 255, 255, .20);
  border-radius: 17px;
  background: rgba(255, 255, 255, .11);
  backdrop-filter: blur(12px);
}

.support-preview-card .icon-box {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  padding: 11px;
  color: #fff;
  border-radius: 14px;
  background: rgba(255, 255, 255, .16);
}

.support-preview-card strong,
.support-preview-card span {
  display: block;
}

.support-preview-card strong {
  font-size: 11px;
}

.support-preview-card span {
  margin-top: 4px;
  color: rgba(255, 255, 255, .68);
  font-size: 8px;
  line-height: 1.45;
}

.support-library-tools {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 15px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.support-guide-search {
  width: min(360px, 100%);
  min-height: 43px;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 13px;
  background: var(--surface-soft);
}

.support-guide-search .icon {
  width: 18px;
  height: 18px;
  color: var(--muted);
}

.support-guide-search input {
  width: 100%;
  border: 0;
  outline: 0;
  color: var(--text);
  background: transparent;
}

.support-category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.support-category-tab {
  min-height: 35px;
  padding: 0 12px;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-soft);
  font-size: 9px;
  font-weight: 900;
  cursor: pointer;
}

.support-category-tab.active {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, #0b6fd3, #00a6e8);
  box-shadow: 0 9px 20px rgba(11, 111, 211, .18);
}

.support-section-title {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px;
}

.support-section-title h3,
.support-section-title p {
  margin: 0;
}

.support-section-title h3 {
  font-size: 17px;
}

.support-section-title p {
  margin-top: 5px;
  color: var(--muted);
  font-size: 10px;
}

.support-guide-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 15px;
}

.support-guide-card {
  min-width: 0;
  overflow: hidden;
  display: grid;
  grid-template-rows: 160px minmax(0, 1fr);
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 19px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: .18s ease;
}

.support-guide-card:hover {
  border-color: #84bee6;
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.support-guide-media {
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: center;
  color: #fff;
  background:
    radial-gradient(circle at 82% 16%, rgba(255, 255, 255, .23), transparent 27%),
    linear-gradient(135deg, #0b6fd3, #00a6e8);
}

.support-guide-card[data-guide-type="image"] .support-guide-media {
  background:
    radial-gradient(circle at 82% 16%, rgba(255, 255, 255, .22), transparent 27%),
    linear-gradient(135deg, #5b7ee5, #24bcd5);
}

.support-guide-media img,
.support-guide-media video {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.support-guide-placeholder {
  display: grid;
  place-items: center;
  gap: 8px;
  text-align: center;
}

.support-guide-placeholder .icon {
  width: 42px;
  height: 42px;
  padding: 11px;
  border-radius: 15px;
  background: rgba(255, 255, 255, .17);
}

.support-guide-placeholder span {
  color: rgba(255, 255, 255, .74);
  font-size: 9px;
  font-weight: 800;
}

.support-guide-type {
  position: absolute;
  top: 11px;
  left: 11px;
  min-height: 24px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 0 9px;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, .24);
  border-radius: 999px;
  background: rgba(6, 53, 94, .36);
  backdrop-filter: blur(9px);
  font-size: 8px;
  font-weight: 900;
}

.support-guide-duration {
  position: absolute;
  right: 11px;
  bottom: 10px;
  min-height: 23px;
  display: inline-flex;
  align-items: center;
  padding: 0 8px;
  color: #fff;
  border-radius: 8px;
  background: rgba(5, 31, 55, .66);
  font-size: 8px;
  font-weight: 900;
}

.support-guide-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 15px;
}

.support-guide-body h4,
.support-guide-body p {
  margin: 0;
}

.support-guide-body h4 {
  font-size: 12px;
  line-height: 1.45;
}

.support-guide-body p {
  color: var(--muted);
  font-size: 9px;
  line-height: 1.55;
}

.support-guide-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 9px;
  margin-top: auto;
  padding-top: 7px;
}

.support-guide-footer span {
  color: var(--primary);
  font-size: 9px;
  font-weight: 900;
}

.support-guide-footer .icon {
  width: 16px;
  height: 16px;
  color: var(--primary);
}

.support-help-banner {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) auto;
  align-items: center;
  gap: 13px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 19px;
  background:
    radial-gradient(circle at 100% 0, rgba(0, 166, 232, .10), transparent 34%),
    var(--surface);
  box-shadow: var(--shadow-sm);
}

.support-help-banner h4,
.support-help-banner p {
  margin: 0;
}

.support-help-banner h4 {
  font-size: 13px;
}

.support-help-banner p {
  margin-top: 5px;
  color: var(--muted);
  font-size: 9px;
  line-height: 1.55;
}

.support-guide-detail {
  display: grid;
  gap: 14px;
}

.support-guide-detail-media {
  min-height: 260px;
  overflow: hidden;
  display: grid;
  place-items: center;
  color: #fff;
  border-radius: 18px;
  background:
    radial-gradient(circle at 82% 16%, rgba(255, 255, 255, .23), transparent 27%),
    linear-gradient(135deg, #0b6fd3, #00a6e8);
}

.support-guide-detail-media img,
.support-guide-detail-media video {
  width: 100%;
  max-height: 500px;
  display: block;
  object-fit: contain;
  background: #071b2c;
}

.support-guide-detail-empty {
  max-width: 430px;
  padding: 30px;
  text-align: center;
}

.support-guide-detail-empty .icon {
  width: 54px;
  height: 54px;
  margin: 0 auto 12px;
  padding: 14px;
  border-radius: 18px;
  background: rgba(255, 255, 255, .16);
}

.support-guide-detail-empty strong {
  display: block;
  font-size: 14px;
}

.support-guide-detail-empty p {
  margin: 7px 0 0;
  color: rgba(255, 255, 255, .72);
  font-size: 10px;
  line-height: 1.6;
}

/* Trợ lý hỗ trợ kéo thả */
.messenger-mini {
  left: auto;
  top: auto;
  right: 22px;
  bottom: 22px;
  width: 62px;
  height: 62px;
  touch-action: none;
}

.messenger-mini.drag-positioned {
  right: auto;
  bottom: auto;
}

.messenger-fab {
  left: 0;
  top: 0;
  right: auto;
  bottom: auto;
  width: 62px;
  height: 62px;
  padding: 14px;
  border-radius: 21px;
  cursor: grab;
  user-select: none;
  touch-action: none;
}

.messenger-fab.dragging,
.messenger-head.dragging {
  cursor: grabbing;
}

.messenger-fab .assistant-bot-icon {
  width: 31px;
  height: 31px;
}

.assistant-label {
  position: absolute;
  right: 72px;
  top: 50%;
  width: max-content;
  max-width: 190px;
  padding: 8px 11px;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow-md);
  font-size: 9px;
  font-weight: 900;
  opacity: 0;
  pointer-events: none;
  transform: translate(8px, -50%);
  transition: .16s ease;
}

.messenger-fab:hover .assistant-label {
  opacity: 1;
  transform: translate(0, -50%);
}

.messenger-mini.anchor-left .assistant-label {
  left: 72px;
  right: auto;
  transform: translate(-8px, -50%);
}

.messenger-mini.anchor-left .messenger-fab:hover .assistant-label {
  transform: translate(0, -50%);
}

.messenger-panel {
  right: 0;
  bottom: 76px;
  left: auto;
  top: auto;
}

.messenger-mini.anchor-left .messenger-panel {
  left: 0;
  right: auto;
}

.messenger-mini.anchor-top .messenger-panel {
  top: 76px;
  bottom: auto;
}

.messenger-mini.anchor-bottom .messenger-panel {
  top: auto;
  bottom: 76px;
}

.messenger-head {
  cursor: grab;
  user-select: none;
  touch-action: none;
}

.messenger-head button,
.messenger-compose,
.messenger-messages {
  touch-action: auto;
}

.messenger-drag-hint {
  display: inline-flex !important;
  align-items: center;
  gap: 4px;
}

.messenger-drag-hint::before {
  content: "⋮⋮";
  color: rgba(255, 255, 255, .62);
  font-size: 10px;
  letter-spacing: -2px;
}

html[data-theme="dark"] .support-library-tools,
html[data-theme="dark"] .support-guide-card,
html[data-theme="dark"] .support-help-banner {
  border-color: var(--border);
  background: #294d67;
}

html[data-theme="dark"] .support-guide-search,
html[data-theme="dark"] .support-category-tab {
  border-color: var(--border);
  background: #24465f;
}

html[data-theme="dark"] .support-category-tab.active {
  color: #10334b;
  background: linear-gradient(135deg, #72d0f6, #55c5ed);
}

@media (max-width: 1020px) {
  .support-library-hero {
    grid-template-columns: 1fr;
  }

  .support-hero-preview {
    grid-template-columns: repeat(2, 1fr);
  }

  .support-guide-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .support-library-hero {
    padding: 20px;
  }

  .support-hero-preview,
  .support-guide-grid {
    grid-template-columns: 1fr;
  }

  .support-library-tools {
    align-items: stretch;
    flex-direction: column;
  }

  .support-guide-search {
    width: 100%;
  }

  .support-help-banner {
    grid-template-columns: 44px minmax(0, 1fr);
  }

  .support-help-banner .button {
    grid-column: 1 / -1;
    width: 100%;
  }

  .messenger-mini {
    width: 58px;
    height: 58px;
  }

  .messenger-fab {
    width: 58px;
    height: 58px;
  }

  .assistant-label {
    display: none;
  }

  .messenger-panel {
    position: fixed !important;
    inset: 10px !important;
    width: auto !important;
    height: auto !important;
    max-height: none !important;
  }
}

/* API-backed screens. These rules extend the existing visual system. */
.modal-backdrop {
  z-index: 1200;
}

.form-gap {
  margin-top: 12px;
}

.modal-open {
  overflow: hidden;
}

.nav-badge {
  min-width: 22px;
  height: 20px;
  display: inline-grid;
  place-items: center;
  margin-left: auto;
  padding: 0 6px;
  color: #fff;
  border-radius: 999px;
  background: var(--danger);
  font-size: 8px;
  font-style: normal;
  font-weight: 900;
}

.full-button {
  width: 100%;
}

.uppercase-input {
  text-transform: uppercase;
}

.compact-input {
  width: 110px;
}

.large-textarea {
  min-height: 180px;
}

.field-button {
  width: 100%;
  margin-top: 7px;
}

.api-result-title {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
}

.api-banner>div {
  min-width: 0;
}

.api-banner>div>strong,
.api-banner>div>span {
  display: block;
}

.api-banner>div>span {
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.5;
}

.quick-action-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.quick-action {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 13px;
  color: var(--text);
  text-align: left;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-soft);
  cursor: pointer;
  transition: .18s ease;
}

.quick-action:hover {
  border-color: var(--primary);
  transform: translateY(-1px);
}

.quick-action>[data-icon-name] {
  width: 24px;
  height: 24px;
  color: var(--primary);
  flex: 0 0 auto;
}

.quick-action strong,
.quick-action small {
  display: block;
}

.quick-action strong {
  font-size: 15px;
}

.quick-action small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.key-value-list {
  display: grid;
  gap: 8px;
}

.key-value-list>div {
  display: grid;
  grid-template-columns: minmax(120px, .8fr) minmax(0, 1.2fr);
  align-items: start;
  gap: 12px;
  padding: 10px 11px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-soft);
}

.key-value-list span {
  color: var(--muted);
  font-size: 13px;
  word-break: break-word;
}

.key-value-list strong {
  font-size: 13px;
  line-height: 1.5;
  text-align: right;
  word-break: break-word;
}

.inline-form {
  display: flex;
  align-items: center;
  gap: 9px;
}

.inline-form .input,
.inline-form .select {
  min-width: 0;
}

.inline-form-wrap {
  flex-wrap: wrap;
}

.connection-layout {
  grid-template-columns: minmax(300px, .8fr) minmax(0, 1.2fr);
}

.connection-id {
  display: block;
  overflow: auto;
  padding: 9px;
  border-radius: 9px;
  background: var(--surface-soft);
  font-size: 12px;
}

.paid-action-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 15px;
  border: 1px solid color-mix(in srgb, var(--primary) 30%, var(--border));
  border-radius: 16px;
  background: color-mix(in srgb, var(--primary-soft) 55%, var(--surface));
}

.paid-action-panel h4,
.paid-action-panel p {
  margin: 0;
}

.paid-action-panel h4 {
  font-size: 16px;
}

.paid-action-panel p {
  margin-top: 5px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.exam-panel,
.progress-form {
  grid-template-columns: 1fr;
}

.checkbox-line {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.wallet-action-grid {
  align-items: start;
}

.payment-live-card {
  display: grid;
  gap: 15px;
}

.payment-detail-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 9px;
}

.payment-detail-grid>div {
  padding: 11px;
  border: 1px solid var(--border);
  border-radius: 13px;
  background: var(--surface-soft);
}

.payment-detail-grid span,
.payment-detail-grid strong {
  display: block;
}

.payment-detail-grid span {
  color: var(--muted);
  font-size: 13px;
}

.payment-detail-grid strong {
  margin-top: 5px;
  font-size: 15px;
  word-break: break-word;
}

.payment-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.secret-once {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 12px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 13px;
  background: var(--surface-soft);
}

.secret-once code {
  min-width: 0;
  flex: 1;
  overflow-wrap: anywhere;
  font-size: 13px;
}

.notification-row {
  align-items: center;
}

.notification-row .activity-copy {
  min-width: 0;
  flex: 1;
}

.notification-row small {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 12px;
}

.notification-item {
  width: 100%;
  text-align: left;
  border: 0;
  background: transparent;
}

.unread-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--primary);
}

.settings-actions {
  align-items: center;
  margin-top: 15px;
}

.settings-actions>span {
  color: var(--muted);
  font-size: 13px;
}

.theme-choice {
  display: flex;
  gap: 9px;
}

.messenger-message {
  max-width: 82%;
  padding: 10px 12px;
  border-radius: 15px;
  font-size: 13px;
  line-height: 1.5;
}

.messenger-message.admin {
  justify-self: start;
  color: var(--text);
  border: 1px solid var(--border);
  background: var(--surface-soft);
  border-bottom-left-radius: 5px;
}

.messenger-message.user {
  justify-self: end;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-bottom-right-radius: 5px;
}

.messenger-message p {
  margin: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.messenger-message>span {
  display: block;
  margin-top: 5px;
  color: inherit;
  opacity: .72;
  font-size: 12px;
}

.chat-media {
  width: min(220px, 100%);
  max-height: 190px;
  display: block;
  margin-bottom: 7px;
  border-radius: 10px;
  object-fit: contain;
  background: #071b2c;
}

.messenger-compose-extended {
  grid-template-columns: 92px minmax(0, 1fr) auto;
}

.messenger-compose-extended select,
.messenger-media-fields input {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 9px;
  color: var(--text);
  background: var(--surface-soft);
  font-size: 12px;
}

.messenger-compose-extended select {
  height: 34px;
  padding: 0 6px;
}

.messenger-media-fields {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 5px;
}

.messenger-media-fields[hidden] {
  display: none;
}

.messenger-media-fields input {
  height: 32px;
  padding: 0 7px;
}

@media (max-width: 900px) {

  .connection-layout,
  .payment-detail-grid {
    grid-template-columns: 1fr;
  }

  .paid-action-panel {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {

  .quick-action-grid,
  .key-value-list>div {
    grid-template-columns: 1fr;
  }

  .key-value-list strong {
    text-align: left;
  }

  .inline-form {
    align-items: stretch;
    flex-direction: column;
  }

  .inline-form .button {
    width: 100%;
  }

  .messenger-compose-extended {
    grid-template-columns: 78px minmax(0, 1fr) auto;
  }

  .messenger-media-fields {
    grid-template-columns: 1fr;
  }
}

/* Readability: keep explanatory text legible on desktop and mobile. */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.brand span,
.eyebrow,
.profile-copy small,
.field label,
.field>span,
.card-header p,
.course-copy span,
.progress-meta,
.date-box span,
.calendar-copy span,
.balance-meta span,
.connection-card p,
.connection-meta,
.profile-header p,
.setting-row p,
.info-row span,
.info-row strong,
.activity-copy span,
.activity-value span,
.notification-item strong,
.notification-item span,
.toast strong,
.toast span,
.integration-note p,
.answer-highlight small,
.answer-explanation,
.payment-qr-content>p,
.payment-qr-info span,
.payment-qr-info strong,
.payment-qr-modal-copy>p,
.support-hero-copy p,
.support-preview-card strong,
.support-preview-card span,
.support-section-title p,
.support-guide-placeholder span,
.support-guide-body p,
.support-guide-footer span,
.support-help-banner p,
.messenger-admin span,
.mini-message-bubble p,
.mini-message-bubble time,
.messenger-welcome p {
  font-size: 13px;
}

.stat-trend,
.badge,
.rank-circle span,
.status,
.text-button,
.lesson-number,
.topup-amount,
.support-category-tab,
.support-guide-type,
.support-guide-duration,
.nav-badge {
  font-size: 12px;
}

.streak-day,
.wallet-hero-stat span,
.topup-payment span,
.topup-summary span,
.giftcode-visual span,
.wallet-help-strip p {
  font-size: 12px;
}

.topup-payment strong,
.payment-method span,
.payment-method strong,
.user-cell span,
.activity-copy strong,
.activity-value strong,
.lesson-item span,
.lesson-item strong,
.support-guide-body h4 {
  font-size: 13px;
}

.messenger-message>span,
.chat-message small,
.secret-once code {
  font-size: 12px;
}

/* Learning progress tree and one-click solver. */
.learning-page {
  gap: 0;
}

.learning-shell {
  padding: 0;
  overflow: hidden;
}

.learning-titlebar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 22px;
  padding: 26px 28px 22px;
  border-bottom: 1px solid var(--border);
}

.learning-titlebar>div {
  min-width: 0;
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.learning-title-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  padding: 10px;
  color: var(--primary);
  border-radius: 13px;
  background: var(--primary-soft);
}

.learning-titlebar h2 {
  margin: 3px 0 7px;
  font-size: clamp(23px, 3vw, 30px);
  line-height: 1.18;
  letter-spacing: -.035em;
}

.learning-titlebar p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.learning-tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 28px;
  border-bottom: 1px solid var(--border);
}

.learning-tabs button {
  min-width: 112px;
  min-height: 50px;
  padding: 0 18px;
  color: var(--muted);
  border: 0;
  border-bottom: 3px solid transparent;
  background: transparent;
  font-size: 14px;
  font-weight: 850;
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease, background .18s ease;
}

.learning-tabs button:hover {
  color: var(--text);
  background: var(--surface-soft);
}

.learning-tabs button.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.learning-tree-box {
  min-height: 300px;
  padding: 22px 28px 24px;
}

.learning-tree {
  display: grid;
  gap: 12px;
}

.learning-accordion {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  transition: border-color .18s ease, box-shadow .18s ease, opacity .18s ease;
}

.learning-accordion:hover,
.learning-accordion.open {
  border-color: color-mix(in srgb, var(--primary) 34%, var(--border));
}

.learning-accordion.open {
  box-shadow: 0 10px 30px rgba(22, 65, 54, .08);
}

.learning-accordion.nested {
  border-radius: 13px;
  background: var(--surface-soft);
  box-shadow: none;
}

.learning-accordion.complete {
  opacity: 1;
  border-color: color-mix(in srgb, var(--success) 28%, var(--border));
  background: color-mix(in srgb, var(--success-soft) 22%, var(--surface));
}

.learning-accordion-head {
  width: 100%;
  min-height: 76px;
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 14px 16px;
  color: var(--text);
  text-align: left;
  border: 0;
  background: transparent;
  cursor: pointer;
  transition: background .16s ease;
}

.learning-accordion.nested>.learning-accordion-head {
  min-height: 66px;
  padding: 11px 13px;
}

.learning-accordion-head:hover,
.learning-accordion.open>.learning-accordion-head {
  background: color-mix(in srgb, var(--primary-soft) 38%, transparent);
}

.learning-chevron {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  color: var(--muted);
  transform: rotate(-90deg);
  transition: transform .2s ease, color .2s ease;
}

.learning-chevron [data-icon-name] {
  width: 18px;
  height: 18px;
}

.learning-accordion.open>.learning-accordion-head .learning-chevron {
  color: var(--primary);
  transform: rotate(0);
}

.learning-course-copy {
  min-width: 0;
  display: grid;
  flex: 1 1 auto;
  gap: 4px;
}

.learning-course-copy>strong {
  overflow-wrap: anywhere;
  font-size: 16px;
  line-height: 1.35;
}

.learning-accordion.nested .learning-course-copy>strong {
  font-size: 14px;
}

.learning-course-copy>span:not(.learning-badges) {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.learning-badges {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.learning-badge {
  min-height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 3px 9px;
  border-radius: 999px;
  color: var(--muted);
  background: var(--surface-strong);
  font-size: 11px;
  font-weight: 850;
  line-height: 1.2;
  white-space: nowrap;
}

.learning-badge.success {
  color: var(--success);
  background: var(--success-soft);
}

.learning-badge.pending {
  color: var(--warning);
  background: var(--warning-soft);
}

.learning-badge.exam {
  color: var(--primary);
  background: var(--primary-soft);
}

.learning-badge.failed {
  color: var(--danger);
  background: var(--danger-soft);
}

.learning-progress {
  min-width: 138px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  flex: 0 0 auto;
}

.learning-progress progress,
.learning-run>progress {
  overflow: hidden;
  border: 0;
  border-radius: 999px;
  appearance: none;
  background: var(--surface-strong);
}

.learning-progress progress {
  width: 94px;
  height: 7px;
}

.learning-progress progress::-webkit-progress-bar,
.learning-run>progress::-webkit-progress-bar {
  border-radius: 999px;
  background: var(--surface-strong);
}

.learning-progress progress::-webkit-progress-value,
.learning-run>progress::-webkit-progress-value {
  border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.learning-progress progress::-moz-progress-bar,
.learning-run>progress::-moz-progress-bar {
  border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.learning-progress strong {
  min-width: 38px;
  color: var(--muted);
  font-size: 12px;
  text-align: right;
}

.learning-accordion-body {
  border-top: 1px solid var(--border);
}

.learning-accordion-inner {
  display: grid;
  gap: 9px;
  padding: 12px;
}

.learning-accordion.nested>.learning-accordion-body>.learning-accordion-inner {
  padding: 8px 10px 10px;
}

.learning-select-all {
  min-height: 46px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  color: var(--primary);
  border: 1px solid color-mix(in srgb, var(--primary) 18%, var(--border));
  border-radius: 11px;
  background: color-mix(in srgb, var(--primary-soft) 55%, var(--surface));
  font-size: 13px;
  font-weight: 850;
  cursor: pointer;
}

.learning-select-all input,
.learning-unit input {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  margin: 0;
  accent-color: var(--primary);
  cursor: pointer;
}

.learning-unit-list {
  display: grid;
  gap: 4px;
}

.learning-unit {
  min-height: 54px;
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 9px 11px;
  border: 1px solid transparent;
  border-radius: 11px;
  cursor: pointer;
  transition: background .15s ease, border-color .15s ease, opacity .15s ease;
}

/* Mục còn bấm được (checkbox chưa bị disabled): sáng màu, viền nhấn để dễ nhận ra. */
.learning-unit:has(> input:not(:disabled)) {
  opacity: 1;
  border-color: color-mix(in srgb, var(--primary) 42%, var(--border));
  background: color-mix(in srgb, var(--primary-soft) 24%, transparent);
}

.learning-unit:has(> input:not(:disabled)):hover {
  border-color: var(--primary);
  background: color-mix(in srgb, var(--primary-soft) 44%, transparent);
}

/* Trạng thái không thể bấm vẫn phải rõ chữ; phân biệt bằng màu nền/viền thay vì làm mờ. */
.learning-unit:has(> input:disabled),
.learning-unit.complete,
.learning-unit.locked {
  opacity: 1;
  cursor: default;
  border-color: color-mix(in srgb, var(--border) 86%, var(--primary));
  background: color-mix(in srgb, var(--surface-soft) 88%, var(--surface));
}

.learning-unit.complete {
  color: color-mix(in srgb, var(--text) 88%, var(--success));
  border-color: color-mix(in srgb, var(--success) 30%, var(--border));
  background: color-mix(in srgb, var(--success-soft) 58%, var(--surface));
}

.learning-unit.locked {
  color: var(--text);
  border-color: color-mix(in srgb, var(--warning) 26%, var(--border));
  background: color-mix(in srgb, var(--warning-soft) 48%, var(--surface));
}

.learning-unit input:disabled {
  cursor: default;
}

.learning-unit-copy {
  min-width: 0;
  display: grid;
  flex: 1 1 auto;
  gap: 3px;
}

.learning-unit-copy strong {
  overflow-wrap: anywhere;
  font-size: 14px;
  line-height: 1.4;
}

.learning-unit-copy small {
  color: var(--muted);
  font-size: 12px;
}

.learning-lesson-group h5 {
  margin: 12px 10px 4px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.learning-note {
  padding: 13px;
  color: var(--muted);
  border-radius: 10px;
  background: var(--surface-soft);
  font-size: 13px;
  line-height: 1.55;
}

.learning-solve-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 28px;
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-soft) 84%, var(--surface));
}

.learning-solve-bar>div {
  min-width: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 5px 11px;
}

.learning-solve-bar strong {
  font-size: 15px;
}

.learning-solve-bar span {
  color: var(--muted);
  font-size: 14px;
}

.learning-solve-bar span b {
  color: var(--success);
  font-size: 16px;
}

.learning-solve-bar small {
  flex-basis: 100%;
  color: var(--muted);
  font-size: 11px;
}

.learning-solve-button {
  min-width: 134px;
  min-height: 48px;
  flex: 0 0 auto;
  font-size: 15px;
}

.learning-run {
  display: grid;
  gap: 13px;
  margin: 0 28px 26px;
  padding: 18px;
  border: 1px solid color-mix(in srgb, var(--primary) 22%, var(--border));
  border-radius: 16px;
  background: color-mix(in srgb, var(--primary-soft) 28%, var(--surface));
}

.learning-run-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.learning-run-head>div {
  display: grid;
  gap: 3px;
}

.learning-run-head span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.learning-run-head strong {
  font-size: 15px;
}

.learning-run>progress {
  width: 100%;
  height: 9px;
}

.learning-run ul {
  max-height: 330px;
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
  overflow: auto;
  list-style: none;
}

.learning-run li {
  min-height: 50px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 10px;
  background: var(--surface);
}

.learning-run li>span:nth-child(2) {
  min-width: 0;
  display: grid;
  flex: 1 1 auto;
  gap: 3px;
}

.learning-run li strong {
  overflow-wrap: anywhere;
  font-size: 13px;
}

.learning-run li small {
  color: var(--muted);
  font-size: 11px;
}

.learning-run-icon {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  padding: 7px;
  color: var(--primary);
  border-radius: 9px;
  background: var(--primary-soft);
}

.learning-empty,
.learning-loading {
  min-height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 9px;
  padding: 30px;
  color: var(--muted);
  text-align: center;
}

.learning-empty>[data-icon-name] {
  width: 42px;
  height: 42px;
  margin-bottom: 4px;
  color: var(--primary);
}

.learning-empty strong,
.learning-loading strong {
  color: var(--text);
  font-size: 17px;
}

.learning-empty span,
.learning-loading span:not(.learning-spinner) {
  max-width: 500px;
  font-size: 13px;
  line-height: 1.55;
}

.learning-connect-empty .button {
  margin-top: 8px;
}

.learning-spinner {
  width: 34px;
  height: 34px;
  border: 3px solid var(--surface-strong);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: learning-spin .75s linear infinite;
}

@keyframes learning-spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 760px) {
  .learning-titlebar {
    padding: 20px 18px 17px;
  }

  .learning-titlebar>div {
    gap: 10px;
  }

  .learning-title-icon {
    width: 38px;
    height: 38px;
  }

  .learning-titlebar .button {
    min-width: 44px;
    width: 44px;
    min-height: 44px;
    padding: 0;
    overflow: hidden;
    gap: 0;
    font-size: 0;
  }

  .learning-titlebar .button [data-icon-name] {
    color: var(--text);
  }

  .learning-tabs {
    padding: 0 18px;
  }

  .learning-tabs button {
    min-width: 0;
    flex: 1 1 50%;
  }

  .learning-tree-box {
    padding: 16px 14px 18px;
  }

  .learning-accordion-head {
    min-height: 72px;
    gap: 8px;
    padding: 12px 11px;
  }

  .learning-chevron {
    width: 24px;
    height: 24px;
  }

  .learning-progress {
    min-width: 43px;
  }

  .learning-progress progress {
    display: none;
  }

  .learning-unit {
    min-height: 58px;
  }

  .learning-solve-bar {
    align-items: stretch;
    flex-direction: column;
    padding: 16px 18px 18px;
  }

  .learning-solve-button {
    width: 100%;
  }

  .learning-run {
    margin: 0 14px 18px;
    padding: 14px;
  }
}

@media (max-width: 940px) {
  body.menu-open {
    overflow: hidden;
  }

  .mobile-menu-button {
    position: relative;
    z-index: 2;
    width: 48px;
    height: 48px;
    min-width: 48px;
    min-height: 48px;
    touch-action: manipulation;
    pointer-events: auto;
  }
}

@media (max-width: 460px) {
  .topbar .mobile-menu-button {
    width: 48px;
    height: 48px;
  }

  .learning-titlebar p {
    font-size: 13px;
  }

  .learning-title-icon {
    display: none;
  }

  .learning-course-copy>strong {
    font-size: 14px;
  }

  .learning-badge {
    padding-inline: 7px;
    font-size: 10px;
  }

  .learning-unit {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .learning-unit .learning-badge {
    margin-left: 29px;
  }

  .learning-run li {
    align-items: flex-start;
    flex-wrap: wrap;
  }
}



/* ================================================================
   THU NHỎ & CO GIÃN GIAO DIỆN THEO MÀN HÌNH
   Giảm kích thước tổng thể khoảng 10% và cho các thành phần chính co
   giãn mượt (fluid) theo bề rộng màn hình bằng clamp(). Chỉ điều chỉnh
   kích thước và khoảng cách, không thay đổi màu sắc hay logic.
   Không dùng zoom vì layout phụ thuộc 100vh và position: fixed.
   ================================================================ */
:root {
  --sidebar-width: clamp(208px, 15.5vw, 242px);
  --topbar-height: 72px;
}

body {
  font-size: clamp(13px, 0.3vw + 12.4px, 14.5px);
}

.content {
  width: min(1320px, 100%);
  padding: clamp(15px, 1.7vw, 24px) clamp(15px, 2vw, 28px) 40px;
}

.page-stack {
  gap: clamp(16px, 1.6vw, 22px);
}

/* Thanh bên */
.brand-mark {
  width: 40px;
  height: 40px;
  font-size: 20px;
  border-radius: 13px;
}

.brand strong {
  font-size: 19px;
}

.nav-item {
  min-height: 44px;
  padding: 9px 12px;
}

.nav-item span:last-child {
  font-size: 13px;
}

.sidebar-card strong {
  font-size: 19px;
}

/* Thanh trên cùng */
.topbar {
  padding: 0 clamp(16px, 2vw, 26px);
}

.topbar-left h1 {
  font-size: clamp(17px, 1.2vw, 20px);
}

.search-box {
  width: min(280px, 24vw);
  height: 40px;
}

.icon-button {
  width: 40px;
  height: 40px;
}

.profile-chip {
  height: 44px;
}

/* Tiêu đề mục & thẻ */
.section-head h2 {
  font-size: clamp(19px, 1.5vw, 22px);
}

.section-head h3 {
  font-size: 17px;
}

.card {
  padding: clamp(16px, 1.5vw, 20px);
}

.card-header h3 {
  font-size: 15px;
}

/* Thẻ thống kê */
.stats-grid {
  gap: clamp(12px, 1.2vw, 16px);
}

.stat-card {
  min-height: 124px;
  padding: 17px;
}

.stat-card strong {
  margin-top: 14px;
  font-size: clamp(20px, 1.9vw, 25px);
}

.stat-icon {
  width: 38px;
  height: 38px;
}

/* Ví & số dư */
.balance-card {
  min-height: 208px;
  padding: 24px;
}

.balance-card h2 {
  font-size: clamp(28px, 3.2vw, 36px);
}

/* Ô nhập liệu */
.input,
.select {
  min-height: 42px;
}

.textarea {
  min-height: 100px;
}

.backend-card {
  padding: 17px;
}



/* ================================================================
   V3 — Sửa layout & thành phần mới
   - Thẻ số dư sidebar không bị cắt nút "Nạp thêm" (nav co giãn, thẻ giữ cỡ)
   - Thanh "Giải ngay" dính đáy màn hình khi có lựa chọn
   - Nhãn deadline, chọn hàng loạt, banner nạp tiền
   - Lịch sử giao dịch dạng tìm kiếm, khối HƯỚNG DẪN, hiệu ứng vén màn
   Chỉ dùng Flexbox/Grid, không fix tạm bằng margin/top/left tuyệt đối.
   ================================================================ */

/* --- Sidebar: nav cuộn, thẻ số dư + nút Nạp thêm luôn hiển thị đầy đủ --- */
.sidebar {
  gap: 16px;
}

.nav {
  flex: 1 1 auto;
  min-height: 0;
}

.sidebar-card {
  position: relative;
  flex: 0 0 auto;
  overflow: visible;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-card strong {
  margin: 6px 0 12px;
  overflow-wrap: anywhere;
}

.sidebar-card .button {
  width: 100%;
}

.logout-button {
  flex: 0 0 auto;
  margin-top: 0;
}

/* --- Thanh Giải ngay: sticky đáy để không phải kéo xuống cuối trang --- */
.learning-shell {
  overflow: visible;
}

.learning-solve-bar {
  position: sticky;
  bottom: clamp(8px, 1.5vw, 16px);
  z-index: 6;
  gap: 12px;
  flex-wrap: wrap;
  box-shadow: 0 16px 36px rgba(8, 96, 86, .18);
}

.learning-page.has-selection .learning-solve-button {
  animation: solvePulse 1.7s ease-in-out infinite;
}

@keyframes solvePulse {

  0%,
  100% {
    box-shadow: 0 10px 24px rgba(8, 121, 107, .28);
  }

  50% {
    box-shadow: 0 14px 32px rgba(8, 121, 107, .5);
  }
}

/* --- Chọn nhanh (chọn tất cả / bỏ chọn) --- */
.learning-bulk {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-strong);
}

.learning-bulk-label {
  font-weight: 700;
  font-size: 13px;
  color: var(--muted);
}

.learning-bulk small {
  flex-basis: 100%;
  color: var(--muted);
  font-size: 12px;
  margin: 0;
}

/* --- Nhãn deadline + trạng thái xếp gọn ở cuối mỗi mục --- */
.learning-unit-tags {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 5px;
  flex: 0 0 auto;
}

.learning-unit-tags .learning-badge {
  white-space: nowrap;
}

/* --- Banner nạp tiền khi thiếu số dư --- */
.learning-topup {
  align-items: center;
}

.learning-topup .button {
  margin-left: auto;
  flex: 0 0 auto;
}

/* --- Lịch sử giao dịch: thanh tìm kiếm + khu vực chi tiết lớn --- */
.billing-search {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.billing-search .input {
  flex: 1 1 260px;
  min-width: 0;
}

.billing-search-icon {
  display: inline-flex;
  align-items: center;
  color: var(--muted);
}

.billing-search-icon svg {
  width: 20px;
  height: 20px;
}

.billing-recent {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.billing-recent-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .06em;
}

.billing-detail-card pre {
  max-height: 60vh;
}

/* --- Khối HƯỚNG DẪN ở trang Tổng quan --- */
.guide-card {
  border: 1px dashed color-mix(in srgb, var(--primary) 45%, var(--border));
  background: color-mix(in srgb, var(--primary) 6%, var(--surface));
}

.guide-head {
  display: flex;
  align-items: center;
  gap: 14px;
}

.guide-head .guide-icon {
  width: 40px;
  height: 40px;
  color: var(--primary);
  flex: 0 0 auto;
}

.guide-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--primary);
  line-height: 1.1;
}

.guide-body {
  margin-top: 12px;
  color: var(--muted);
  font-size: 15px;
}

/* --- Rèm vải mở từ giữa và co/gom về hai mép khi tải trang --- */
#page-curtain {
  position: fixed;
  inset: 0;
  z-index: 999;
  overflow: hidden;
  pointer-events: auto;
  isolation: isolate;
}

#page-curtain::after {
  content: "";
  position: absolute;
  z-index: 2;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  background: linear-gradient(180deg, rgba(255, 255, 255, .12), rgba(0, 0, 0, .32), rgba(255, 255, 255, .10));
  box-shadow: 0 0 22px rgba(0, 0, 0, .28);
  opacity: .72;
  transition: opacity .2s ease .08s;
}

#page-curtain.lifted {
  pointer-events: none;
}

#page-curtain.lifted::after {
  opacity: 0;
}

.page-curtain-panel {
  position: absolute;
  z-index: 1;
  top: 0;
  bottom: 0;
  width: 50.1%;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .16), transparent 12%, rgba(0, 0, 0, .11) 80%, rgba(0, 0, 0, .25)),
    repeating-linear-gradient(90deg,
      #075f59 0%, #0d8176 5%, #064f4a 10%, #0b7569 15%,
      #043f3b 20%, #0d8176 25%, #075f59 30%);
  box-shadow: inset 0 0 42px rgba(0, 0, 0, .25);
  will-change: transform, filter;
  transition: transform 1.05s cubic-bezier(.72, 0, .18, 1), filter .8s ease;
}

.page-curtain-panel::before,
.page-curtain-panel::after {
  content: "";
  position: absolute;
  right: 0;
  left: 0;
  height: 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, .15), rgba(0, 0, 0, .22));
  box-shadow: 0 5px 12px rgba(0, 0, 0, .14);
}

.page-curtain-panel::before {
  top: 0;
}

.page-curtain-panel::after {
  bottom: 0;
  transform: scaleY(-1);
}

.page-curtain-left {
  left: 0;
  transform-origin: left center;
  border-right: 1px solid rgba(255, 255, 255, .08);
}

.page-curtain-right {
  right: 0;
  transform-origin: right center;
  border-left: 1px solid rgba(0, 0, 0, .12);
}

.page-curtain-fold {
  position: absolute;
  inset: 18px 0;
  background:
    radial-gradient(ellipse at 18% 50%, rgba(255, 255, 255, .13), transparent 19%),
    radial-gradient(ellipse at 52% 45%, rgba(255, 255, 255, .10), transparent 22%),
    radial-gradient(ellipse at 86% 55%, rgba(0, 0, 0, .16), transparent 22%);
  mix-blend-mode: soft-light;
}

#page-curtain.lifted .page-curtain-left,
#page-curtain.lifted .page-curtain-right {
  transform: scaleX(.035);
  filter: brightness(.78) saturate(.86);
}

.page-curtain-tie {
  position: absolute;
  z-index: 4;
  top: calc(50% - 45px);
  width: 24px;
  height: 90px;
  border: 2px solid rgba(255, 230, 168, .88);
  border-radius: 45% 55% 55% 45%;
  background: linear-gradient(90deg, #8c6117, #f0cf72 42%, #a97620 72%, #f7dc88);
  box-shadow: 0 8px 18px rgba(0, 0, 0, .28), inset 0 0 5px rgba(255, 255, 255, .42);
  will-change: left, right;
  transition: left 1.05s cubic-bezier(.72, 0, .18, 1), right 1.05s cubic-bezier(.72, 0, .18, 1), opacity .2s ease .9s;
}

.page-curtain-tie::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 7px;
  height: 36px;
  border-radius: 999px;
  background: #f7dc88;
  box-shadow: 0 29px 0 -1px #d7a83d;
  transform: translate(-50%, -2px) rotate(15deg);
}

.page-curtain-tie-left {
  left: calc(50% - 24px);
}

.page-curtain-tie-right {
  right: calc(50% - 24px);
  border-radius: 55% 45% 45% 55%;
}

#page-curtain.lifted .page-curtain-tie-left {
  left: 7px;
  opacity: 0;
}

#page-curtain.lifted .page-curtain-tie-right {
  right: 7px;
  opacity: 0;
}

.page-curtain-inner {
  position: absolute;
  z-index: 5;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: #fff;
  text-shadow: 0 2px 15px rgba(0, 0, 0, .34);
  transition: opacity .18s ease, transform .24s ease;
}

#page-curtain.lifted .page-curtain-inner {
  opacity: 0;
  transform: scale(.92);
}

.page-curtain-logo {
  width: 72px;
  height: 72px;
  display: grid;
  place-items: center;
  color: #087065;
  border: 1px solid rgba(255, 255, 255, .75);
  border-radius: 24px;
  background: linear-gradient(145deg, #fff, #e9fffa);
  box-shadow: 0 18px 44px rgba(0, 0, 0, .28), inset 0 0 0 4px rgba(7, 117, 105, .06);
  font-size: 36px;
  font-weight: 900;
}

.page-curtain-title {
  font-size: 19px;
  font-weight: 850;
  letter-spacing: .22em;
  text-transform: uppercase;
}

.page-curtain-subtitle {
  margin-top: -7px;
  color: rgba(255, 255, 255, .68);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: .2em;
  text-transform: uppercase;
}

.page-curtain-spinner {
  width: 30px;
  height: 30px;
  margin-top: 4px;
  border: 3px solid rgba(255, 255, 255, .28);
  border-top-color: #fff;
  border-radius: 50%;
  animation: curtainSpin .8s linear infinite;
}

@keyframes curtainSpin {
  to {
    transform: rotate(360deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-curtain-panel {
    transition: opacity .25s ease;
  }

  #page-curtain.lifted .page-curtain-panel {
    opacity: 0;
    transform: none;
  }

  .page-curtain-tie {
    display: none;
  }

  .page-curtain-inner {
    transition: opacity .2s ease;
  }

  #page-curtain.lifted .page-curtain-inner {
    transform: none;
  }

  .page-curtain-spinner {
    animation-duration: 1.8s;
  }

  .learning-page.has-selection .learning-solve-button {
    animation: none;
  }
}

/* ===== Unified dashboard visual system (2026) ===== */
:root {
  --bg: #f1f7ff;
  --surface: #ffffff;
  --surface-soft: #f7fbff;
  --surface-strong: #e8f2ff;
  --text: #102a43;
  --muted: #5f7489;
  --border: #cfe0f1;
  --primary: #1668dc;
  --primary-hover: #0e56bd;
  --primary-soft: #e5efff;
  --primary-ink: #0a438f;
  --secondary: #00a7d9;
  --secondary-soft: #dff7ff;
  --success: #14795a;
  --success-soft: #dff4e9;
  --warning: #ad5d00;
  --warning-soft: #fff0cc;
  --danger: #c83d52;
  --danger-soft: #ffe5e9;
  --shadow-sm: 0 8px 24px rgba(23, 91, 157, .08);
  --shadow-md: 0 20px 52px rgba(18, 75, 134, .13);
  --shadow-lg: 0 34px 86px rgba(10, 52, 99, .20);
  --sidebar-width: 276px;
  --sidebar-collapsed-width: 84px;
  --sidebar-current-width: var(--sidebar-width);
  --topbar-height: 88px;
}

html[data-theme="dark"] {
  --bg: #081523;
  --surface: #102235;
  --surface-soft: #142a40;
  --surface-strong: #1b3550;
  --text: #edf6ff;
  --muted: #a8bfd2;
  --border: #2b4862;
  --primary: #69a9ff;
  --primary-hover: #89bbff;
  --primary-soft: #1d3d64;
  --primary-ink: #c6dcff;
  --secondary: #55d8f2;
  --secondary-soft: #153e4c;
  --success: #63d5a9;
  --success-soft: #173f34;
  --warning: #ffc466;
  --warning-soft: #49381c;
  --danger: #ff8d9d;
  --danger-soft: #4d2831;
}

body {
  background:
    radial-gradient(circle at 92% 2%, rgba(0, 167, 217, .17), transparent 28%),
    radial-gradient(circle at 50% 36%, rgba(22, 104, 220, .07), transparent 34%),
    linear-gradient(180deg, #edf6ff 0%, var(--bg) 46%, #f7fbff 100%);
}

html[data-theme="dark"] body {
  background:
    radial-gradient(circle at 90% 0, rgba(65, 151, 255, .13), transparent 30%),
    radial-gradient(circle at 25% 70%, rgba(0, 190, 220, .07), transparent 34%),
    var(--bg);
}

.sidebar {
  width: var(--sidebar-current-width);
  gap: 16px;
  padding: 24px 18px 18px;
  overflow: visible;
  border-right-color: color-mix(in srgb, var(--primary) 14%, var(--border));
  background:
    radial-gradient(circle at 20% 0, rgba(0, 167, 217, .10), transparent 24%),
    color-mix(in srgb, var(--surface) 96%, transparent);
  box-shadow: 12px 0 38px rgba(22, 85, 145, .06);
  transition: width .24s ease, padding .24s ease, transform .24s ease;
}

.sidebar-head {
  min-height: 54px;
  display: flex;
  align-items: center;
}

.brand {
  width: 100%;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 3px 8px 9px;
  color: var(--text);
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.brand:hover .brand-mark {
  transform: translateY(-2px) rotate(-3deg);
  box-shadow: 0 17px 32px rgba(22, 104, 220, .34);
}

.brand-mark {
  background: linear-gradient(145deg, #1668dc, #00a7d9);
  box-shadow: 0 13px 28px rgba(22, 104, 220, .28);
  transition: transform .2s ease, box-shadow .2s ease;
}

.brand-copy {
  min-width: 0;
  white-space: nowrap;
}

.sidebar-collapse-button {
  position: absolute;
  top: 70px;
  right: -15px;
  z-index: 2;
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  padding: 7px;
  color: var(--primary);
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: color .18s ease, transform .24s ease, background .18s ease;
}

.sidebar-collapse-button:hover {
  color: #fff;
  background: var(--primary);
  transform: scale(1.08);
}

.nav {
  gap: 6px;
  padding: 5px 0 8px;
  overflow-x: hidden;
}

.nav-item {
  min-height: 48px;
  color: #526b82;
  border: 1px solid transparent;
  border-radius: 14px;
  transition: transform .18s ease, color .18s ease, background .18s ease, box-shadow .18s ease;
}

html[data-theme="dark"] .nav-item {
  color: var(--muted);
}

.nav-item:hover {
  color: var(--primary);
  border-color: color-mix(in srgb, var(--primary) 16%, var(--border));
  background: var(--primary-soft);
}

.nav-item.active {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, #1668dc, #008fca);
  box-shadow: 0 13px 28px rgba(22, 104, 220, .25);
}

.nav-section-label {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 13px 9px 3px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.nav-section-label::after {
  content: "";
  height: 1px;
  flex: 1;
  background: var(--border);
}

.logout-button {
  margin-top: auto;
}

.workspace {
  margin-left: var(--sidebar-current-width);
  transition: margin-left .24s ease;
}

body.sidebar-collapsed {
  --sidebar-current-width: var(--sidebar-collapsed-width);
}

body.sidebar-collapsed .sidebar {
  padding-inline: 12px;
}

body.sidebar-collapsed .brand {
  justify-content: center;
  padding-inline: 0;
}

body.sidebar-collapsed .brand-copy,
body.sidebar-collapsed .nav-item>span:not(.nav-icon),
body.sidebar-collapsed .nav-badge,
body.sidebar-collapsed .nav-section-label>span {
  display: none;
}

body.sidebar-collapsed .nav-item {
  justify-content: center;
  gap: 0;
  padding-inline: 0;
}

body.sidebar-collapsed .nav-section-label {
  margin-inline: 10px;
}

body.sidebar-collapsed .sidebar-collapse-button [data-icon] {
  transform: rotate(180deg);
}

.topbar {
  height: var(--topbar-height);
  padding: 0 28px;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom-color: color-mix(in srgb, var(--primary) 12%, var(--border));
  box-shadow: 0 8px 28px rgba(20, 79, 139, .04);
}

.account-balance {
  min-height: 48px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 5px 14px 5px 7px;
  color: var(--text);
  border: 1px solid color-mix(in srgb, var(--primary) 24%, var(--border));
  border-radius: 15px;
  background: linear-gradient(135deg, var(--surface), var(--primary-soft));
  box-shadow: 0 8px 22px rgba(22, 104, 220, .09);
  cursor: pointer;
  white-space: nowrap;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.account-balance:hover {
  border-color: var(--primary);
  box-shadow: 0 12px 28px rgba(22, 104, 220, .16);
  transform: translateY(-2px);
}

.account-balance-icon {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  padding: 8px;
  color: #fff;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
}

.account-balance small,
.account-balance strong {
  display: block;
  text-align: left;
}

.account-balance small {
  color: var(--muted);
  font-size: 10px;
  font-weight: 750;
}

.account-balance strong {
  margin-top: 2px;
  color: var(--primary-ink);
  font-size: 14px;
  font-weight: 900;
}

.content {
  width: min(1560px, 100%);
  padding: 30px 30px 56px;
}

.card,
.backend-card,
.learning-shell,
.stat-card {
  border-color: color-mix(in srgb, var(--primary) 10%, var(--border));
  box-shadow: var(--shadow-sm);
}

.card:hover,
.backend-card:hover,
.stat-card:hover {
  border-color: color-mix(in srgb, var(--primary) 28%, var(--border));
}

.button {
  border-radius: 12px;
  transition: transform .17s ease, box-shadow .17s ease, background .17s ease, border-color .17s ease, color .17s ease;
}

.button-primary {
  color: #fff;
  background: linear-gradient(135deg, #1668dc, #008fc9);
  box-shadow: 0 10px 24px rgba(22, 104, 220, .23);
}

.button-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #0e56bd, #0079ae);
  box-shadow: 0 14px 30px rgba(22, 104, 220, .31);
}

.button:disabled,
.icon-button:disabled,
.learning-tabs button:disabled {
  opacity: 1;
  color: #243f54;
  border-color: #a9c0d2;
  background: #dce7f0;
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

html[data-theme="dark"] .button:disabled,
html[data-theme="dark"] .icon-button:disabled,
html[data-theme="dark"] .learning-tabs button:disabled {
  color: #c5d7e5;
  border-color: #49677f;
  background: #29465d;
}

/* Learning states: actionable = bright, completed = darker, locked = neutral. */
.learning-accordion.complete {
  opacity: 1;
  border-color: color-mix(in srgb, var(--success) 30%, var(--border));
  background: color-mix(in srgb, var(--success-soft) 45%, var(--surface-strong));
}

.learning-unit:has(> input:not(:disabled)) {
  opacity: 1;
  color: var(--text);
  border-color: color-mix(in srgb, var(--primary) 48%, var(--border));
  background: color-mix(in srgb, var(--primary-soft) 48%, var(--surface));
  box-shadow: 0 5px 16px rgba(22, 104, 220, .08);
}

.learning-unit:has(> input:not(:disabled)):hover {
  border-color: var(--primary);
  background: color-mix(in srgb, var(--primary-soft) 75%, var(--surface));
  box-shadow: 0 9px 22px rgba(22, 104, 220, .14);
  transform: translateY(-1px);
}

.learning-unit:has(> input:disabled),
.learning-unit.complete,
.learning-unit.locked {
  opacity: 1;
}

.learning-unit.complete {
  color: color-mix(in srgb, var(--text) 84%, var(--success));
  border-color: color-mix(in srgb, var(--success) 34%, var(--border));
  background: color-mix(in srgb, var(--success-soft) 58%, var(--surface-strong));
}

.learning-unit.complete .learning-unit-copy small,
.learning-accordion.complete .learning-course-copy>span:not(.learning-badges) {
  color: color-mix(in srgb, var(--muted) 78%, var(--success));
}

.learning-unit.locked {
  color: #536b80;
  border-color: var(--border);
  background: var(--surface-strong);
}

.learning-unit:has(> input:disabled):not(.complete):not(.locked) {
  color: var(--muted);
  border-color: var(--border);
  background: color-mix(in srgb, var(--surface-strong) 72%, var(--surface));
}

.learning-badge.success {
  color: #fff;
  background: #14795a;
  box-shadow: 0 5px 12px rgba(20, 121, 90, .16);
}

.learning-badge.pending {
  color: #7d4100;
  border: 1px solid #f2ca7a;
  background: #ffebbd;
}

.learning-badge.neutral {
  color: #455f76;
  border: 1px solid #c3d2df;
  background: #e0e9f1;
}

html[data-theme="dark"] .learning-badge.success {
  color: #06291e;
  background: #63d5a9;
}

html[data-theme="dark"] .learning-badge.pending {
  color: #2d1b00;
  border-color: #9d762d;
  background: #ffc466;
}

html[data-theme="dark"] .learning-badge.neutral {
  color: #d5e4f1;
  border-color: #48647d;
  background: #2b465e;
}

/* Dedicated guide page. */
.guide-hero {
  position: relative;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  overflow: hidden;
  padding: clamp(26px, 5vw, 54px);
  color: #fff;
  border-radius: 26px;
  background:
    radial-gradient(circle at 88% 18%, rgba(255, 255, 255, .24), transparent 24%),
    linear-gradient(135deg, #104fa9, #167bdc 58%, #00a7d9);
  box-shadow: 0 24px 58px rgba(22, 104, 220, .22);
}

.guide-hero .eyebrow {
  color: rgba(255, 255, 255, .78);
}

.guide-hero h2 {
  max-width: 760px;
  margin: 10px 0 10px;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.08;
  letter-spacing: -.045em;
}

.guide-hero p {
  max-width: 720px;
  margin: 0;
  color: rgba(255, 255, 255, .82);
  font-size: 15px;
  line-height: 1.7;
}

.guide-hero-icon {
  width: 112px;
  height: 112px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  padding: 27px;
  border: 1px solid rgba(255, 255, 255, .24);
  border-radius: 30px;
  background: rgba(255, 255, 255, .14);
  transform: rotate(4deg);
}

.guide-steps {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.guide-step-card {
  position: relative;
  min-height: 230px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-content: start;
  gap: 14px;
  overflow: hidden;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.guide-step-card:hover {
  border-color: color-mix(in srgb, var(--primary) 38%, var(--border));
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.guide-step-number {
  position: absolute;
  right: 18px;
  top: 12px;
  color: color-mix(in srgb, var(--primary) 12%, transparent);
  font-size: 68px;
  font-weight: 950;
  letter-spacing: -.08em;
}

.guide-step-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  padding: 12px;
  color: var(--primary);
  border-radius: 15px;
  background: var(--primary-soft);
}

.guide-step-card h3 {
  position: relative;
  margin: 3px 0 7px;
  font-size: 18px;
}

.guide-step-card p {
  position: relative;
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.guide-step-card .button {
  grid-column: 1 / -1;
  align-self: end;
  justify-self: start;
  margin-top: 10px;
}

.guide-tip-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.guide-tip-grid>div {
  padding: 15px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-soft);
}

.guide-tip-grid strong,
.guide-tip-grid span {
  display: block;
}

.guide-tip-grid span {
  margin-top: 6px;
  color: var(--muted);
  line-height: 1.55;
}

/* The guide stays visible from every user page and gives new accounts a clear start. */
.topbar-guide-button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 14px;
  color: #fff;
  border: 1px solid color-mix(in srgb, var(--primary) 65%, #fff);
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), #008fc9);
  box-shadow: 0 9px 22px rgba(22, 104, 220, .2);
  font-size: 13px;
  font-weight: 850;
  white-space: nowrap;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease;
}

.topbar-guide-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 13px 28px rgba(22, 104, 220, .3);
}

.topbar-guide-button [data-icon] {
  width: 19px;
  height: 19px;
}

.beginner-guide-notice {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  padding: 22px;
  border: 1px solid color-mix(in srgb, var(--primary) 38%, var(--border));
  border-radius: 22px;
  background:
    radial-gradient(circle at 92% 15%, color-mix(in srgb, var(--primary) 18%, transparent), transparent 32%),
    linear-gradient(135deg, var(--surface), color-mix(in srgb, var(--primary-soft) 74%, var(--surface)));
  box-shadow: 0 16px 36px rgba(22, 104, 220, .12);
}

.beginner-guide-icon,
.new-user-guide-modal-icon {
  display: grid;
  place-items: center;
  color: #fff;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--primary), #00a7d9);
  box-shadow: 0 12px 28px rgba(22, 104, 220, .25);
}

.beginner-guide-icon {
  width: 62px;
  height: 62px;
  padding: 16px;
}

.beginner-guide-copy h3 {
  margin: 5px 0 7px;
  font-size: 20px;
  letter-spacing: -.025em;
}

.beginner-guide-copy p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.beginner-guide-actions,
.guide-hero-actions,
.guide-inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.new-user-guide-modal {
  display: grid;
  justify-items: center;
  text-align: center;
}

.new-user-guide-modal-icon {
  width: 76px;
  height: 76px;
  padding: 19px;
  margin-bottom: 10px;
}

.new-user-guide-modal p {
  margin: 7px 0;
}

.new-user-guide-modal ul {
  width: 100%;
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  text-align: left;
}

.new-user-guide-modal li {
  position: relative;
  padding: 9px 10px 9px 31px;
  border-bottom: 1px solid var(--border);
}

.new-user-guide-modal li::before {
  position: absolute;
  left: 9px;
  content: "✓";
  color: var(--success);
  font-weight: 900;
}

.connection-guide-hint {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  color: var(--muted);
  border: 1px solid color-mix(in srgb, var(--primary) 20%, var(--border));
  border-radius: 12px;
  background: var(--primary-soft);
  font-size: 12px;
}

.connection-guide-hint [data-icon-name] {
  width: 18px;
  height: 18px;
  color: var(--primary);
  flex: 0 0 auto;
}

.connection-guide-hint span {
  flex: 1;
}

.connection-guide-hint .text-button {
  font-size: 12px;
}

.guide-hero-actions {
  margin-top: 20px;
}

.guide-hero-button {
  min-height: 40px;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, .35);
  background: rgba(255, 255, 255, .14);
  backdrop-filter: blur(8px);
}

.guide-hero-button:hover {
  color: var(--primary-ink);
  background: #fff;
}

.guide-jump-nav {
  position: sticky;
  top: calc(var(--topbar-height) + 10px);
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(18px);
}

.guide-jump-nav>strong {
  flex: 0 0 auto;
  font-size: 12px;
}

.guide-jump-nav>div {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.guide-jump-nav button {
  min-height: 32px;
  padding: 0 11px;
  color: var(--primary);
  border: 1px solid color-mix(in srgb, var(--primary) 22%, var(--border));
  border-radius: 999px;
  background: var(--primary-soft);
  font-size: 11px;
  font-weight: 800;
  cursor: pointer;
}

.guide-section,
.guide-detail-card,
.guide-security {
  scroll-margin-top: calc(var(--topbar-height) + 90px);
}

.guide-section {
  display: grid;
  gap: 16px;
}

.guide-section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
}

.guide-section-heading h2 {
  margin: 5px 0 0;
  font-size: clamp(22px, 3vw, 30px);
  letter-spacing: -.035em;
}

.guide-section-heading p {
  margin: 7px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.guide-topic-grid,
.guide-payment-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  align-items: start;
}

.guide-detail-card {
  display: grid;
  gap: 16px;
}

.guide-visual {
  margin: 0;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--primary) 24%, var(--border));
  border-radius: 16px;
  background: var(--surface-soft);
}

.guide-image-button {
  position: relative;
  width: 100%;
  display: block;
  overflow: hidden;
  padding: 0;
  border: 0;
  background: #eef5ff;
  cursor: zoom-in;
}

.guide-image-button img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform .24s ease, filter .24s ease;
}

.guide-image-button:hover img {
  transform: scale(1.015);
  filter: saturate(1.04);
}

.guide-image-zoom {
  position: absolute;
  right: 12px;
  bottom: 12px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 11px;
  color: #fff;
  border-radius: 999px;
  background: rgba(8, 38, 85, .86);
  box-shadow: 0 8px 20px rgba(8, 38, 85, .24);
  backdrop-filter: blur(8px);
  font-size: 11px;
  font-weight: 850;
}

.guide-image-zoom [data-icon-name] {
  width: 16px;
  height: 16px;
}

.guide-visual figcaption {
  padding: 11px 13px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.guide-video-block {
  display: grid;
  gap: 12px;
  padding: 14px;
  border: 1px solid color-mix(in srgb, var(--primary) 24%, var(--border));
  border-radius: 16px;
  background: color-mix(in srgb, var(--primary) 5%, var(--surface));
}

.guide-video-block h4 {
  margin: 0;
  color: var(--text);
  font-size: 15px;
  line-height: 1.35;
}

.guide-video-block p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.guide-video-block video {
  display: block;
  width: 100%;
  max-height: 560px;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  border: 1px solid color-mix(in srgb, var(--primary) 18%, var(--border));
  border-radius: 12px;
  background: #071321;
  box-shadow: 0 12px 32px rgba(8, 38, 85, .16);
}

.modal.modal-guide-image {
  width: min(1500px, calc(100vw - 28px));
}

.modal-guide-image .modal-body {
  padding-inline: 14px;
}

.guide-image-modal-scroll {
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #eef5ff;
}

.guide-image-modal-media {
  width: 100%;
  min-width: 900px;
  height: auto;
  display: block;
}

.guide-image-modal-link {
  margin: 10px 2px 0;
  text-align: right;
}

.guide-image-modal-link a {
  color: var(--primary);
  font-weight: 800;
}

.guide-detail-head {
  display: flex;
  align-items: center;
  gap: 13px;
}

.guide-detail-head h3 {
  margin: 4px 0 0;
  font-size: 20px;
}

.guide-detail-head code,
.guide-checklist code,
.guide-alternative code {
  overflow-wrap: anywhere;
  color: var(--primary-ink);
}

.guide-platform-label {
  color: var(--primary);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: .13em;
}

.guide-detail-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  padding: 12px;
  color: var(--primary);
  border-radius: 15px;
  background: var(--primary-soft);
}

.guide-callout {
  display: grid;
  gap: 5px;
  padding: 13px 14px;
  color: var(--primary-ink);
  border: 1px solid color-mix(in srgb, var(--primary) 24%, var(--border));
  border-radius: 13px;
  background: var(--primary-soft);
  line-height: 1.55;
}

.guide-callout.success {
  color: color-mix(in srgb, var(--success) 82%, var(--text));
  border-color: color-mix(in srgb, var(--success) 30%, var(--border));
  background: var(--success-soft);
}

.guide-callout span {
  color: inherit;
  opacity: .88;
}

.guide-checklist {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-checklist>li {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 11px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 13px;
  background: var(--surface-soft);
}

.guide-checklist>li>span {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  color: #fff;
  border-radius: 10px;
  background: var(--primary);
  font-size: 12px;
  font-weight: 900;
}

.guide-checklist strong {
  display: block;
}

.guide-checklist p {
  margin: 4px 0 0;
  color: var(--muted);
  line-height: 1.55;
}

.guide-checklist kbd {
  display: inline-block;
  padding: 1px 6px;
  color: var(--text);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--surface);
  font: 11px ui-monospace, monospace;
}

.guide-alternative {
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 13px;
  background: var(--surface-soft);
}

.guide-alternative summary {
  color: var(--primary);
  font-weight: 850;
  cursor: pointer;
}

.guide-alternative ol {
  margin: 12px 0 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.65;
}

.guide-payment-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
}

.guide-payment-card h3 {
  margin: 2px 0 10px;
  font-size: 19px;
}

.guide-payment-card ol {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.7;
}

.guide-payment-card .guide-callout {
  margin-top: 14px;
}

.guide-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.guide-feature-grid button {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  color: var(--text);
  text-align: left;
  border: 1px solid var(--border);
  border-radius: 15px;
  background: var(--surface);
  cursor: pointer;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.guide-feature-grid button:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.guide-feature-grid [data-icon-name] {
  width: 34px;
  height: 34px;
  padding: 7px;
  color: var(--primary);
  border-radius: 10px;
  background: var(--primary-soft);
  flex: 0 0 auto;
}

.guide-feature-grid strong,
.guide-feature-grid small {
  display: block;
}

.guide-feature-grid small {
  margin-top: 4px;
  color: var(--muted);
  line-height: 1.45;
}

.guide-security {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  padding: 22px;
  border-color: color-mix(in srgb, var(--warning) 34%, var(--border));
  background: color-mix(in srgb, var(--warning-soft) 55%, var(--surface));
}

.guide-security-icon {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  padding: 14px;
  color: var(--warning);
  border-radius: 17px;
  background: var(--warning-soft);
}

.guide-security h3 {
  margin: 5px 0 9px;
  font-size: 20px;
}

.guide-security ul {
  margin: 0;
  padding-left: 19px;
  color: var(--muted);
  line-height: 1.7;
}

.guide-final-card {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 0;
}

.guide-final-card h3 {
  margin: 0 0 5px;
}

.guide-final-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

/* Embedded administration keeps the shared shell and receives content styles only. */
.admin-portal {
  display: grid;
  gap: 18px;
  animation: page-rise .22s ease-out both;
}

.admin-portal .content-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.admin-portal .content-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.admin-portal .table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 15px;
}

.admin-portal .data-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
}

.admin-portal .data-table th,
.admin-portal .data-table td {
  padding: 13px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.admin-portal .data-table th {
  color: var(--muted);
  background: var(--surface-soft);
  font-size: 10px;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.admin-portal .data-table td {
  font-size: 12px;
}

.admin-portal .filter-form {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 10px;
}

.admin-portal .filter-form .field {
  min-width: 150px;
  flex: 1 1 170px;
}

.admin-portal .detail-item {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 13px;
  background: var(--surface-soft);
}

.admin-portal .detail-item span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
}

.admin-portal .pagination-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 14px;
}

@keyframes page-rise {
  from {
    opacity: 0;
    transform: translateY(7px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1280px) {
  .search-box {
    width: min(220px, 19vw);
  }

  .account-balance {
    padding-right: 10px;
  }

  .topbar-guide-button {
    width: 44px;
    padding-inline: 0;
  }

  .topbar-guide-button>span:last-child {
    display: none;
  }
}

@media (max-width: 1080px) {
  .search-box {
    display: none;
  }

  .guide-tip-grid {
    grid-template-columns: 1fr;
  }

  .guide-topic-grid,
  .guide-payment-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 940px) {
  :root {
    --sidebar-current-width: var(--sidebar-width);
  }

  body.sidebar-collapsed {
    --sidebar-current-width: var(--sidebar-width);
  }

  .sidebar {
    width: var(--sidebar-width);
    padding: 24px 18px 18px;
  }

  body.sidebar-collapsed .brand-copy,
  body.sidebar-collapsed .nav-item>span:not(.nav-icon),
  body.sidebar-collapsed .nav-section-label>span {
    display: initial;
  }

  body.sidebar-collapsed .nav-item {
    justify-content: flex-start;
    gap: 13px;
    padding: 10px 13px;
  }

  .sidebar-collapse-button {
    display: none;
  }

  .workspace {
    margin-left: 0;
  }

  .guide-steps,
  .admin-portal .content-grid.three {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 720px) {
  :root {
    --topbar-height: 74px;
  }

  .topbar {
    padding-inline: 14px;
  }

  .account-balance {
    min-height: 42px;
    padding: 4px 9px 4px 5px;
    border-radius: 13px;
  }

  .account-balance-icon {
    width: 32px;
    height: 32px;
    border-radius: 10px;
  }

  .account-balance small {
    display: none;
  }

  .account-balance strong {
    margin: 0;
    font-size: 12px;
  }

  .content {
    padding: 20px 15px 42px;
  }

  .guide-hero {
    min-height: 0;
    padding: 28px 23px;
  }

  .guide-hero-icon {
    display: none;
  }

  .guide-steps,
  .admin-portal .content-grid,
  .admin-portal .content-grid.three {
    grid-template-columns: 1fr;
  }

  .beginner-guide-notice {
    grid-template-columns: auto minmax(0, 1fr);
    padding: 18px;
  }

  .beginner-guide-actions {
    grid-column: 1 / -1;
  }

  .guide-jump-nav {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .guide-section-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .guide-feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .learning-tree-box {
    padding-inline: 14px;
  }

  .learning-titlebar,
  .learning-solve-bar {
    padding-inline: 16px;
  }
}

@media (max-width: 480px) {
  .account-balance {
    padding-right: 7px;
  }

  .account-balance span:not(.account-balance-icon) {
    max-width: 78px;
    overflow: hidden;
  }

  .account-balance strong {
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .guide-step-card {
    padding: 20px;
  }

  .beginner-guide-notice {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .beginner-guide-icon {
    margin-inline: auto;
  }

  .beginner-guide-actions {
    grid-column: auto;
    justify-content: center;
  }

  .beginner-guide-actions .button {
    width: 100%;
  }

  .guide-hero-actions .button {
    width: 100%;
  }

  .guide-feature-grid {
    grid-template-columns: 1fr;
  }

  .guide-payment-card,
  .guide-security {
    grid-template-columns: 1fr;
  }

  .guide-payment-card>.guide-detail-icon,
  .guide-security-icon {
    margin-inline: auto;
  }

  .guide-security {
    text-align: left;
  }

  .connection-guide-hint {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .profile-chip {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

/* Runtime feedback: completion, history, and proactive support. */
.learning-unit.complete,
.learning-unit.locked,
.learning-unit:has(> input:disabled) {
  opacity: 1 !important;
}

.learning-unit.complete .learning-unit-copy strong {
  color: var(--text) !important;
  font-weight: 850;
}

.learning-badge.success {
  color: #fff !important;
  background: #14795a !important;
}

.learning-completion-card {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(180px, 1fr) auto auto;
  align-items: center;
  gap: 16px;
  margin: 18px 28px 0;
  padding: 17px 48px 17px 17px;
  overflow: hidden;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 18px;
  background:
    radial-gradient(circle at 90% 0, rgba(255, 255, 255, .20), transparent 28%),
    linear-gradient(135deg, #116c50, #148866 58%, #0c9d86);
  box-shadow: 0 16px 36px rgba(20, 121, 90, .20);
  animation: completion-in .28s ease-out both;
}

.learning-completion-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, .25);
  border-radius: 15px;
  background: rgba(255, 255, 255, .15);
}

.learning-completion-copy .eyebrow {
  color: rgba(255, 255, 255, .72);
}

.learning-completion-copy h3 {
  margin: 4px 0 3px;
  font-size: 17px;
}

.learning-completion-copy p {
  margin: 0;
  color: rgba(255, 255, 255, .76);
  font-size: 12px;
}

.learning-completion-meta {
  display: flex;
  align-items: stretch;
  gap: 8px;
  margin: 0;
}

.learning-completion-meta>div {
  min-width: 120px;
  padding: 9px 11px;
  border-radius: 12px;
  background: rgba(4, 57, 43, .24);
}

.learning-completion-meta dt {
  color: rgba(255, 255, 255, .68);
  font-size: 9px;
  font-weight: 800;
  text-transform: uppercase;
}

.learning-completion-meta dd {
  margin: 4px 0 0;
  font-size: 12px;
  font-weight: 900;
}

.completion-dismiss {
  position: absolute;
  top: 9px;
  right: 9px;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  padding: 8px;
  color: rgba(255, 255, 255, .75);
  border: 0;
  border-radius: 9px;
  background: transparent;
  cursor: pointer;
}

.completion-dismiss:hover {
  color: #fff;
  background: rgba(255, 255, 255, .14);
}

@keyframes completion-in {
  from {
    opacity: 0;
    transform: translateY(-8px) scale(.985);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.history-card {
  padding: 0;
  overflow: hidden;
}

.history-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  padding: 7px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-soft);
}

.history-tabs button {
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  color: var(--muted);
  border: 1px solid transparent;
  border-radius: 12px;
  background: transparent;
  font-weight: 850;
  cursor: pointer;
  transition: .18s ease;
}

.history-tabs button [data-icon-name] {
  width: 18px;
  height: 18px;
}

.history-tabs button:hover {
  color: var(--primary);
  background: var(--primary-soft);
}

.history-tabs button.active {
  color: #fff;
  background: linear-gradient(135deg, #1668dc, #008fc9);
  box-shadow: 0 9px 22px rgba(22, 104, 220, .20);
}

.history-content {
  min-height: 260px;
  padding: 16px;
}

.history-list {
  display: grid;
  gap: 9px;
}

.history-row {
  display: grid;
  grid-template-columns: 44px minmax(190px, 1.4fr) minmax(130px, .8fr) minmax(80px, .45fr) minmax(120px, .6fr);
  align-items: center;
  gap: 13px;
  padding: 13px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  transition: border-color .17s ease, transform .17s ease, box-shadow .17s ease;
}

.history-row:hover {
  border-color: color-mix(in srgb, var(--primary) 35%, var(--border));
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.history-row-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  padding: 10px;
  color: var(--primary);
  border-radius: 13px;
  background: var(--primary-soft);
}

.history-row.deposit .history-row-icon {
  color: var(--success);
  background: var(--success-soft);
}

.history-row>div {
  min-width: 0;
}

.history-row>div>span {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.history-row>div>strong {
  display: block;
  overflow-wrap: anywhere;
  font-size: 12px;
}

.history-main strong {
  font-size: 14px !important;
}

.history-main span {
  margin-top: 4px;
  margin-bottom: 0 !important;
  text-transform: none !important;
}

.history-loading {
  min-height: 220px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 12px;
  color: var(--muted);
}

.billing-lookup {
  padding: 0;
  overflow: hidden;
}

.billing-lookup>summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 17px 19px;
  cursor: pointer;
  list-style: none;
}

.billing-lookup>summary::-webkit-details-marker {
  display: none;
}

.billing-lookup>summary>span {
  display: flex;
  align-items: center;
  gap: 9px;
}

.billing-lookup>summary>span [data-icon-name] {
  width: 18px;
  height: 18px;
  color: var(--primary);
}

.billing-lookup>summary small {
  color: var(--muted);
}

.billing-lookup-body {
  display: grid;
  gap: 15px;
  padding: 0 19px 19px;
  border-top: 1px solid var(--border);
}

.billing-lookup-body .billing-search {
  margin-top: 17px;
}

.support-nudge {
  position: absolute;
  right: 74px;
  bottom: 8px;
  width: max-content;
  max-width: min(270px, calc(100vw - 100px));
  min-height: 44px;
  padding: 10px 14px;
  color: var(--text);
  border: 1px solid color-mix(in srgb, var(--primary) 24%, var(--border));
  border-radius: 14px;
  background: var(--surface);
  box-shadow: var(--shadow-md);
  font-size: 12px;
  font-weight: 800;
  line-height: 1.4;
  text-align: left;
  cursor: pointer;
  pointer-events: auto;
  opacity: 0;
  transform: translateX(8px) scale(.96);
  transform-origin: right center;
  transition: opacity .24s ease, transform .24s ease;
}

.support-nudge i {
  position: absolute;
  right: -6px;
  bottom: 15px;
  width: 12px;
  height: 12px;
  border-top: 1px solid var(--border);
  border-right: 1px solid var(--border);
  background: var(--surface);
  transform: rotate(45deg);
}

.support-nudge.visible {
  opacity: 1;
  transform: translateX(0) scale(1);
}

.messenger-mini.open .support-nudge {
  opacity: 0;
  pointer-events: none;
}

.messenger-mini.anchor-left .support-nudge {
  left: 74px;
  right: auto;
  transform-origin: left center;
  transform: translateX(-8px) scale(.96);
}

.messenger-mini.anchor-left .support-nudge.visible {
  transform: translateX(0) scale(1);
}

.messenger-mini.anchor-left .support-nudge i {
  left: -6px;
  right: auto;
  border: 0;
  border-bottom: 1px solid var(--border);
  border-left: 1px solid var(--border);
}

@media (max-width: 1040px) {
  .learning-completion-card {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .learning-completion-meta {
    grid-column: 1 / -1;
  }

  .history-row {
    grid-template-columns: 42px minmax(150px, 1fr) minmax(120px, .7fr);
  }

  .history-row>div:nth-last-child(-n+2) {
    grid-column: span 1;
  }
}

@media (max-width: 680px) {
  .learning-completion-card {
    margin-inline: 14px;
    padding: 15px 42px 15px 15px;
  }

  .learning-completion-icon {
    width: 42px;
    height: 42px;
  }

  .learning-completion-meta {
    display: grid;
    grid-template-columns: 1fr;
    width: 100%;
  }

  .learning-completion-meta>div {
    min-width: 0;
  }

  .history-tabs button {
    font-size: 12px;
  }

  .history-row {
    grid-template-columns: 40px minmax(0, 1fr);
    align-items: start;
  }

  .history-row>div:not(.history-main) {
    grid-column: 2;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding-top: 7px;
    border-top: 1px dashed var(--border);
  }

  .history-row>div>span {
    margin: 0;
  }

  .billing-lookup>summary {
    align-items: flex-start;
    flex-direction: column;
  }

  .support-nudge {
    right: 70px;
    max-width: min(230px, calc(100vw - 92px));
    font-size: 11px;
  }
}

/* PayOS ten-minute lifetime */
.payment-expiry {
  display: flex;
  align-items: center;
  gap: 13px;
  margin: 0 0 16px;
  padding: 13px 15px;
  color: var(--primary-ink);
  border: 1px solid color-mix(in srgb, var(--primary) 30%, var(--border));
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary-soft), var(--secondary-soft));
}

.payment-expiry>[data-icon-name] {
  width: 28px;
  height: 28px;
  flex: 0 0 auto;
}

.payment-expiry-clock {
  min-width: 76px;
  display: inline-grid;
  place-items: center;
  padding: 8px 10px;
  color: #fff;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  box-shadow: 0 7px 18px rgba(22, 104, 220, .20);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 18px;
  font-weight: 900;
  letter-spacing: .03em;
}

.payment-expiry strong,
.payment-expiry span {
  display: block;
}

.payment-expiry div>span {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.payment-expiry.expired {
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 38%, var(--border));
  background: var(--danger-soft);
}

.payment-expiry.expired div>span {
  color: color-mix(in srgb, var(--danger) 72%, var(--muted));
}

.payment-expiry.paid {
  color: var(--success);
  border-color: color-mix(in srgb, var(--success) 38%, var(--border));
  background: var(--success-soft);
}

.payment-live-card.is-expired .payment-qr-panel,
.payment-live-card.is-expired a[href*="payos"] {
  display: none !important;
}

.payment-live-card.is-expired {
  border-color: color-mix(in srgb, var(--danger) 36%, var(--border));
}

@media (max-width: 520px) {
  .payment-expiry {
    align-items: flex-start;
  }

  .payment-expiry-clock {
    min-width: 68px;
    font-size: 16px;
  }
}

/* Final contrast guard: native disabled controls must not fade their whole learning row. */
.learning-unit.complete,
.learning-unit.locked,
.learning-unit:has(> input:disabled) {
  opacity: 1 !important;
}

.learning-unit.complete .learning-unit-copy strong,
.learning-unit.locked .learning-unit-copy strong,
.learning-unit:has(> input:disabled) .learning-unit-copy strong {
  color: var(--text) !important;
}

.learning-unit.complete .learning-unit-copy small,
.learning-unit.locked .learning-unit-copy small,
.learning-unit:has(> input:disabled) .learning-unit-copy small {
  color: color-mix(in srgb, var(--text) 68%, var(--muted)) !important;
}

.learning-unit.complete {
  background: color-mix(in srgb, var(--success) 16%, var(--surface)) !important;
  border-color: color-mix(in srgb, var(--success) 48%, var(--border)) !important;
}

.learning-accordion.complete {
  background: color-mix(in srgb, var(--success) 8%, var(--surface)) !important;
  border-color: color-mix(in srgb, var(--success) 36%, var(--border)) !important;
}

html[data-theme="dark"] .messenger-send:disabled {
  color: #c5d7e5;
  border-color: #49677f;
  background: #29465d;
}

/* High-contrast terminal learning states (must remain last in the cascade). */
.learning-accordion.complete {
  opacity: 1 !important;
  filter: none !important;
}

.learning-accordion.complete>.learning-accordion-head .learning-course-copy>strong {
  color: #173d31 !important;
}

.learning-unit.complete {
  opacity: 1 !important;
  filter: none !important;
  color: #173d31 !important;
  border-color: #65a98f !important;
  background: #d8eee5 !important;
}

.learning-unit.complete .learning-unit-copy strong {
  color: #173d31 !important;
  opacity: 1 !important;
}

.learning-unit.complete .learning-unit-copy small {
  color: #315f50 !important;
  opacity: 1 !important;
}

.learning-unit.complete .learning-unit-tags,
.learning-unit.complete .learning-badge,
.learning-unit.complete input:disabled {
  opacity: 1 !important;
  filter: none !important;
}

.learning-unit.locked,
.learning-unit:has(> input:disabled):not(.complete) {
  opacity: 1 !important;
  filter: none !important;
  color: #243f54 !important;
  border-color: #b5c8d7 !important;
  background: #e5edf3 !important;
}

html[data-theme="dark"] .learning-accordion.complete>.learning-accordion-head .learning-course-copy>strong,
html[data-theme="dark"] .learning-unit.complete,
html[data-theme="dark"] .learning-unit.complete .learning-unit-copy strong {
  color: #e7f8f1 !important;
}

html[data-theme="dark"] .learning-unit.complete {
  border-color: #4f9c7e !important;
  background: #23463a !important;
}

html[data-theme="dark"] .learning-unit.complete .learning-unit-copy small {
  color: #b8d9cc !important;
}

html[data-theme="dark"] .learning-unit.locked,
html[data-theme="dark"] .learning-unit:has(> input:disabled):not(.complete) {
  color: #d3e2ee !important;
  border-color: #49677f !important;
  background: #29465d !important;
}


/* Messenger-style support chat with real media uploads. */
.messenger-backdrop {
  position: fixed;
  inset: 0;
  z-index: 168;
  opacity: 0;
  background: rgba(9, 30, 53, .22);
  backdrop-filter: blur(2px);
  pointer-events: auto;
  transition: opacity .22s ease;
}

.messenger-backdrop.visible {
  opacity: 1;
}

.messenger-mini {
  z-index: 175;
}

.messenger-panel {
  width: min(392px, calc(100vw - 28px));
  height: min(620px, calc(100vh - 108px));
  grid-template-rows: auto minmax(0, 1fr) auto;
  border: 0;
  border-radius: 19px;
  background: var(--surface);
  box-shadow: 0 24px 80px rgba(13, 44, 74, .30), 0 3px 12px rgba(13, 44, 74, .12);
  transform: translateY(18px) scale(.94);
  transition: opacity .22s ease, visibility .22s ease, transform .32s cubic-bezier(.16, 1, .3, 1);
}

.messenger-mini.open .messenger-panel {
  transform: translateY(0) scale(1);
}

.messenger-head {
  min-height: 70px;
  padding: 12px 13px;
  color: #fff;
  background: linear-gradient(135deg, #087cf0 0%, #0084ff 52%, #0099ff 100%);
}

.messenger-admin-avatar {
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 2px solid rgba(255, 255, 255, .42);
  border-radius: 50%;
  background: rgba(255, 255, 255, .17);
}

.messenger-admin-avatar>[data-icon-name] {
  width: 22px;
  height: 22px;
}

.messenger-online-dot {
  right: 0;
  bottom: 0;
  width: 12px;
  height: 12px;
  border: 2px solid #0784f6;
  background: #31c969;
}

.messenger-admin strong {
  font-size: 14px;
  letter-spacing: -.01em;
}

.messenger-admin>div>span {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-top: 3px;
  color: rgba(255, 255, 255, .82);
  font-size: 10px;
}

.messenger-presence-dot {
  width: 6px;
  height: 6px;
  margin: 0 !important;
  border-radius: 50%;
  background: #75f2a5;
}

.messenger-head-actions {
  gap: 4px;
}

.messenger-icon-button {
  width: 36px;
  height: 36px;
  padding: 9px;
  border-radius: 50%;
  transition: background .16s ease, transform .16s ease;
}

.messenger-icon-button:hover {
  background: rgba(255, 255, 255, .24);
  transform: scale(1.05);
}

.messenger-messages {
  gap: 4px;
  padding: 16px 12px 18px;
  overscroll-behavior: contain;
  background: var(--surface);
  scrollbar-width: thin;
}

.mini-message-row {
  gap: 7px;
  margin-top: 2px;
  animation: messenger-message-in .22s ease both;
}

.mini-message-row.user {
  justify-content: flex-end;
}

.mini-message-avatar {
  width: 27px;
  height: 27px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  color: #fff;
  border-radius: 50%;
  background: linear-gradient(135deg, #0084ff, #28a8ff);
  font-size: 11px;
  font-weight: 900;
}

.mini-message-stack {
  max-width: min(78%, 285px);
  display: grid;
  gap: 3px;
}

.mini-message-row.user .mini-message-stack {
  justify-items: end;
}

.mini-message-bubble {
  width: fit-content;
  max-width: 100%;
  padding: 9px 12px;
  border: 0;
  border-radius: 18px 18px 18px 5px;
  background: #e9edf2;
  box-shadow: none;
}

.mini-message-row.user .mini-message-bubble {
  border-radius: 18px 18px 5px 18px;
  background: #0084ff;
  box-shadow: none;
}

.mini-message-bubble:has(.chat-media) {
  overflow: hidden;
  padding: 3px;
}

.mini-message-bubble:has(.chat-media) p {
  padding: 7px 9px 4px;
}

.mini-message-bubble:has(.chat-media) time {
  padding: 0 8px 6px;
}

.mini-message-bubble p {
  font-size: 13px;
  line-height: 1.36;
}

.mini-message-bubble time {
  margin-top: 4px;
  color: #7b8490;
  font-size: 9px;
}

.mini-message-row.user .mini-message-bubble time {
  color: rgba(255, 255, 255, .72);
}

.messenger-delivery {
  padding-inline: 5px;
  color: var(--muted);
  font-size: 9px;
}

.messenger-media-link {
  display: block;
  color: inherit;
}

.chat-media {
  display: block;
  width: min(100%, 270px);
  max-height: 300px;
  object-fit: cover;
  border-radius: 15px;
  background: #101820;
}

video.chat-media {
  object-fit: contain;
}

.messenger-welcome {
  max-width: 280px;
  padding: 32px 18px;
}

.messenger-welcome-mark {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  margin: 0 auto 12px;
  padding: 14px;
  color: #fff;
  border-radius: 50%;
  background: linear-gradient(135deg, #087cf0, #00a5ff);
  box-shadow: 0 12px 30px rgba(0, 132, 255, .25);
}

.messenger-welcome strong {
  font-size: 15px;
}

.messenger-welcome p {
  font-size: 11px;
}

.messenger-compose {
  display: block;
  padding: 8px 9px 10px;
  border-top: 1px solid color-mix(in srgb, var(--border) 76%, transparent);
  background: var(--surface);
}

.messenger-composer-row {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) 38px;
  align-items: end;
  gap: 6px;
}

.messenger-attach,
.messenger-send {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  padding: 9px;
  border: 0;
  border-radius: 50%;
  cursor: pointer;
  transition: transform .16s ease, background .16s ease;
}

.messenger-attach {
  color: #0084ff;
  background: transparent;
}

.messenger-attach:hover {
  background: rgba(0, 132, 255, .10);
  transform: scale(1.06);
}

.messenger-send {
  color: #fff;
  background: #0084ff;
  box-shadow: 0 6px 16px rgba(0, 132, 255, .25);
}

.messenger-send:hover {
  transform: scale(1.06);
  background: #087cf0;
}

.messenger-attach svg,
.messenger-send svg {
  width: 20px;
  height: 20px;
}

.messenger-input-shell {
  min-height: 40px;
  display: grid;
  gap: 1px;
  padding: 7px 12px 5px;
  border: 1px solid transparent;
  border-radius: 20px;
  background: var(--surface-strong);
  cursor: text;
  transition: border-color .16s ease, box-shadow .16s ease;
}

.messenger-input-shell:focus-within {
  border-color: rgba(0, 132, 255, .28);
  box-shadow: 0 0 0 3px rgba(0, 132, 255, .08);
}

.messenger-compose .messenger-input-shell textarea {
  width: 100%;
  min-height: 20px;
  max-height: 116px;
  padding: 0;
  overflow-y: auto;
  border: 0;
  border-radius: 0;
  outline: 0;
  background: transparent;
  box-shadow: none;
  font-size: 13px;
  line-height: 1.4;
  resize: none;
}

.messenger-compose .messenger-input-shell textarea:focus {
  border: 0;
  box-shadow: none;
}

.messenger-input-shell small {
  overflow: hidden;
  color: var(--muted);
  font-size: 8px;
  line-height: 1.25;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.messenger-attachment-preview {
  position: relative;
  display: grid;
  grid-template-columns: 50px minmax(0, 1fr) 30px;
  align-items: center;
  gap: 9px;
  margin: 0 0 8px;
  padding: 7px;
  border: 1px solid rgba(0, 132, 255, .20);
  border-radius: 14px;
  background: rgba(0, 132, 255, .07);
  animation: messenger-attachment-in .2s ease both;
}

.messenger-attachment-visual {
  width: 50px;
  height: 50px;
  overflow: hidden;
  border-radius: 11px;
  background: #101820;
}

.messenger-attachment-visual img,
.messenger-attachment-visual video {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.messenger-attachment-copy {
  min-width: 0;
}

.messenger-attachment-copy strong,
.messenger-attachment-copy span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.messenger-attachment-copy strong {
  font-size: 11px;
}

.messenger-attachment-copy span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 9px;
}

.messenger-remove-attachment {
  width: 29px;
  height: 29px;
  display: grid;
  place-items: center;
  padding: 7px;
  color: var(--muted);
  border: 0;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
}

.messenger-remove-attachment:hover {
  color: var(--danger);
  background: var(--danger-soft);
}

.messenger-panel.is-sending::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, #0084ff, transparent);
  animation: messenger-uploading 1s linear infinite;
}

.messenger-panel button:disabled,
.messenger-panel textarea:disabled {
  opacity: .58;
  cursor: wait;
}

html[data-theme="dark"] .messenger-panel,
html[data-theme="dark"] .messenger-messages,
html[data-theme="dark"] .messenger-compose {
  background: var(--surface);
}

html[data-theme="dark"] .mini-message-bubble {
  color: var(--text);
  background: var(--surface-strong);
}

html[data-theme="dark"] .mini-message-row.user .mini-message-bubble {
  color: #fff;
  background: #087cf0;
}

html[data-theme="dark"] .messenger-input-shell {
  background: var(--surface-strong);
}

@keyframes messenger-message-in {
  from {
    opacity: 0;
    transform: translateY(5px) scale(.98);
  }

  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes messenger-attachment-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }

  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes messenger-uploading {
  from {
    transform: translateX(-100%);
  }

  to {
    transform: translateX(100%);
  }
}

@media (max-width: 680px) {
  body.messenger-is-open {
    overflow: hidden;
  }

  .messenger-panel,
  .messenger-mini.anchor-left .messenger-panel,
  .messenger-mini.anchor-top .messenger-panel,
  .messenger-mini.anchor-bottom .messenger-panel {
    position: fixed;
    inset: 8px;
    width: auto;
    height: auto;
    max-height: none;
    border-radius: 17px;
    transform-origin: center;
  }

  .messenger-head {
    min-height: 66px;
  }

  .mini-message-stack {
    max-width: 84%;
  }
}

@media (prefers-reduced-motion: reduce) {

  .messenger-panel,
  .messenger-backdrop,
  .mini-message-row,
  .messenger-attachment-preview {
    animation: none !important;
    transition: none !important;
  }
}