:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f7;
  --text-primary: #1d1d1f;
  --text-secondary: #86868b;
  --accent: #2454d6;
  --accent-strong: #1b43b4;
  --success: #19b89d;
  --warning: #d99a2b;
  --danger: #d95c68;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-soft: rgba(245, 245, 247, 0.82);
  --separator: rgba(60, 60, 67, 0.11);
  --accent-soft: rgba(36, 84, 214, 0.1);
  --success-soft: rgba(25, 184, 157, 0.11);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  --shadow-deep: 0 24px 60px rgba(0, 0, 0, 0.12);
  --radius-card: 18px;
  --radius-large: 28px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 48px;
  --space-2xl: 96px;
  --text-hero: 600 36px/1.12 -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --text-title: 600 28px/1.2 -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --text-subtitle: 600 20px/1.28 -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --text-body: 400 16px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --text-caption: 400 13px/1.4 -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --ink: var(--text-primary);
  --muted: var(--text-secondary);
  --paper: var(--bg-secondary);
  --panel: var(--surface);
  --line: var(--separator);
  --navy: var(--accent);
  --navy-deep: var(--accent-strong);
  --teal: var(--success);
  --mint: var(--success-soft);
  --gold: var(--warning);
  --rose: var(--danger);
  --blue: var(--accent);
  --green: var(--success);
  --primary-soft: var(--accent-soft);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  color: var(--ink);
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 50% -12%, rgba(255, 255, 255, 1), rgba(245, 245, 247, 0) 380px),
    linear-gradient(180deg, var(--bg-secondary), var(--bg-primary) 55%, var(--bg-secondary)),
    var(--paper);
  color: var(--text-primary);
  font: var(--text-body);
}

.assessment-home {
  min-height: 100vh;
  display: grid;
  align-content: start;
  padding-top: var(--space-xl);
  padding-bottom: 120px;
}

.assessment-hero-clean {
  text-align: center;
  padding: 0 0 var(--space-lg);
}

.assessment-icon {
  width: 92px;
  height: 92px;
  margin: 0 auto var(--space-lg);
  display: grid;
  place-items: center;
  border-radius: 26px;
  background: linear-gradient(145deg, var(--navy), #5f7ee6);
  box-shadow: 0 24px 48px rgba(36, 84, 214, 0.22);
  font-size: 42px;
}

.assessment-hero-clean h1 {
  margin: 0;
  font: var(--text-hero);
}

.assessment-hero-clean p {
  margin: var(--space-sm) 0 0;
  color: var(--text-secondary);
}

.assessment-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  width: min(280px, 100%);
  margin: var(--space-lg) auto 0;
}

.assessment-stats div {
  display: grid;
  gap: 8px;
  place-items: center;
}

.assessment-stats strong {
  color: var(--navy);
  font-size: 30px;
  line-height: 1;
}

.assessment-stats small {
  font-size: 15px;
  margin-left: 2px;
}

.assessment-stats span {
  color: #9aa3b1;
  font-size: 13px;
}

.info-card-clean {
  margin-top: var(--space-md);
  padding: var(--space-lg);
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: var(--radius-card);
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.info-card-clean:last-of-type {
  margin-bottom: var(--space-md);
}

.info-card-clean h2 {
  margin: 0 0 var(--space-sm);
  font: var(--text-subtitle);
}

.info-card-clean p,
.info-card-clean li {
  color: var(--text-primary);
  line-height: 1.7;
}

.info-card-clean ul {
  margin: 0;
  padding-left: 18px;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.chip-row span {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  color: var(--navy);
  background: var(--primary-soft);
  font: var(--text-caption);
}

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

button {
  cursor: pointer;
}

.app-shell,
.admin-shell {
  min-height: 100vh;
}

.screen {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md) 104px;
}

.narrow {
  width: min(760px, 100%);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 42px;
  margin-bottom: 12px;
  padding: 0 2px;
  color: var(--ink);
  background: transparent;
  box-shadow: none;
}

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

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background:
    linear-gradient(135deg, var(--navy) 0 52%, transparent 52%),
    linear-gradient(315deg, var(--teal) 0 52%, var(--gold) 52%);
  box-shadow: var(--soft-shadow);
  flex: 0 0 auto;
}

.brand-title {
  margin: 0;
  font-size: 15px;
  line-height: 1.25;
  font-weight: 750;
}

.brand-subtitle {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.link-button,
.ghost-button,
.primary-button,
.secondary-button,
.danger-button,
.icon-button {
  border: 0;
  border-radius: 14px;
  min-height: 44px;
  padding: 0 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.primary-button {
  background: var(--accent);
  color: #fff;
  border-radius: 980px;
  font-weight: 600;
  box-shadow: 0 12px 28px rgba(36, 84, 214, 0.2);
}

.secondary-button {
  background: var(--success);
  color: #fff;
  border-radius: 980px;
  font-weight: 600;
  box-shadow: 0 14px 28px rgba(25, 184, 157, 0.2);
}

.ghost-button {
  color: var(--navy);
  background: var(--primary-soft);
  border-radius: 980px;
  font-weight: 600;
}

.topbar .ghost-button {
  min-height: 34px;
  color: var(--navy);
  background: var(--primary-soft);
  box-shadow: none;
}

.topbar .ghost-button:hover {
  background: #dbeaff;
}

.topbar .brand-mark {
  box-shadow: none;
}

.danger-button {
  color: #fff;
  background: var(--rose);
}

.link-button {
  color: var(--navy);
  background: transparent;
  padding: 0;
  min-height: auto;
}

.icon-button {
  width: 44px;
  padding: 0;
  color: var(--navy);
  background: rgba(118, 118, 128, 0.12);
}

.primary-button:hover,
.secondary-button:hover,
.ghost-button:hover,
.danger-button:hover,
.icon-button:hover {
  transform: translateY(-1px);
}

button:disabled,
.primary-button:disabled,
.ghost-button:disabled,
.secondary-button:disabled,
.danger-button:disabled {
  cursor: not-allowed;
  opacity: 0.62;
  transform: none;
  box-shadow: none;
}

.primary-button.is-loading::before {
  content: "";
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.45);
  border-top-color: #fff;
  animation: spin 780ms linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.button-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.sticky-actions {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 20;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
  background: rgba(245, 245, 247, 0.78);
  border-top: 1px solid rgba(60, 60, 67, 0.08);
  backdrop-filter: blur(24px) saturate(180%);
}

.sticky-actions .inner {
  width: min(760px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.sticky-actions .inner.single {
  grid-template-columns: 1fr;
}

.sticky-actions .inner.with-skip {
  grid-template-columns: 1fr 1fr;
}

.sticky-actions .inner.quiz-nav {
  grid-template-columns: 1fr 1fr;
}

.link-skip {
  grid-column: 1 / -1;
  min-height: 30px;
  border: 0;
  background: transparent;
  color: var(--muted);
}

.hero-panel,
.panel,
.card,
.question-panel {
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow);
  border-radius: var(--radius-card);
  backdrop-filter: blur(18px);
}

.hero-panel {
  overflow: hidden;
}

.hero-band {
  min-height: 210px;
  padding: 28px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 24px;
  align-items: center;
  color: #fff;
  background:
    radial-gradient(circle at 82% 18%, rgba(255, 255, 255, 0.22), transparent 24%),
    linear-gradient(135deg, var(--navy), var(--navy-deep));
}

.hero-band h1,
.section-title h1 {
  margin: 0;
  font-size: 30px;
  line-height: 1.18;
  letter-spacing: 0;
}

.hero-band p {
  margin: 12px 0 0;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.82);
}

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

.intro-radar-card {
  min-height: 230px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  background: rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  padding: 12px;
  display: grid;
  align-content: center;
}

.intro-radar-card p {
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
  text-align: center;
}

.intro-radar-card .radar text {
  fill: rgba(255, 255, 255, 0.86);
}

.intro-radar-card .radar polygon:first-child,
.intro-radar-card .radar polygon:nth-child(2),
.intro-radar-card .radar line {
  stroke: rgba(255, 255, 255, 0.28);
}

.metric-tile {
  min-height: 88px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  padding: 14px;
}

.metric-tile strong {
  display: block;
  font-size: 26px;
  line-height: 1;
}

.metric-tile span {
  display: block;
  margin-top: 8px;
  color: rgba(255, 255, 255, 0.76);
  font-size: 13px;
}

.intro-body,
.panel {
  padding: 20px;
}

.notice-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.notice-list li {
  display: flex;
  gap: 10px;
  color: var(--muted);
  line-height: 1.65;
}

.notice-list li::before {
  content: "";
  width: 7px;
  height: 7px;
  margin-top: 10px;
  background: var(--teal);
  border-radius: 50%;
  flex: 0 0 auto;
}

.grid {
  display: grid;
  gap: 14px;
}

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

.field {
  display: grid;
  gap: 8px;
}

.field label {
  color: var(--ink);
  font-size: 14px;
  font-weight: 650;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  min-height: 46px;
  padding: 10px 12px;
  outline: none;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(18, 124, 120, 0.12);
}

.progress-wrap {
  display: grid;
  gap: 8px;
  margin: 16px 0;
}

.progress-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 13px;
}

.progress-track {
  height: 8px;
  border-radius: 999px;
  background: #dfe8ee;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--teal), var(--gold));
  border-radius: inherit;
  transition: width 220ms ease;
}

.question-panel {
  padding: 22px;
  border-radius: 22px;
}

.quiz-screen {
  padding-top: 20px;
}

.quiz-header {
  margin-bottom: 14px;
  text-align: left;
}

.quiz-header h1 {
  margin: 0;
  font-size: 24px;
  line-height: 1.25;
}

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

.question-type {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  background: var(--mint);
  color: var(--teal);
  font-size: 13px;
  font-weight: 700;
}

.question-title {
  margin: 16px 0 18px;
  font-size: 20px;
  line-height: 1.55;
}

.question-image {
  margin: 0 0 18px;
  overflow: hidden;
  border-radius: 18px;
  background: var(--surface-soft);
  border: 1px solid rgba(60, 60, 67, 0.08);
}

.question-image img {
  display: block;
  width: 100%;
  max-height: 260px;
  object-fit: cover;
}

.option-list {
  display: grid;
  gap: 10px;
}

.option {
  display: grid;
  grid-template-columns: 32px 1fr;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 56px;
  padding: 12px;
  border: 1px solid rgba(60, 60, 67, 0.1);
  background: rgba(255, 255, 255, 0.82);
  color: var(--ink);
  border-radius: 16px;
  text-align: left;
}

.option .option-key {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: rgba(118, 118, 128, 0.12);
  font-weight: 750;
  font-size: 17px;
}

.option.selected {
  border-color: rgba(0, 122, 255, 0.55);
  background: rgba(0, 122, 255, 0.08);
}

.option.selected .option-key {
  background: var(--navy);
  color: #fff;
}

.result-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: var(--space-lg);
  align-items: start;
}

.result-layout > .panel:first-child {
  display: grid;
  gap: 10px;
}

.result-layout > .panel:first-child > .button-row {
  margin-top: -4px;
}

.result-layout > .panel:first-child > p.muted {
  margin: 0;
  line-height: 1.6;
}

.score-ring {
  --score: 0;
  container-type: inline-size;
  width: 184px;
  height: 184px;
  margin: 0 auto 4px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at center, var(--bg-primary) 0 58%, transparent 59%),
    conic-gradient(var(--success) calc(var(--score) * 1%), rgba(60,60,67,.1) 0);
  box-shadow: inset 0 0 0 1px var(--line);
}

.score-ring > div {
  width: 58%;
  min-height: 58%;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 3px;
  text-align: center;
}

.score-ring strong {
  display: block;
  font-weight: 700;
  font-size: clamp(32px, 18cqi, 48px);
  line-height: 1;
}

.score-ring em {
  display: block;
  margin: 0;
  max-width: 92px;
  font-size: clamp(11px, 5.3cqi, 14px);
  line-height: 1.15;
  font-style: normal;
  font-weight: 800;
  text-align: center;
}

.score-ring span {
  color: var(--muted);
  display: block;
  text-align: center;
  font-size: clamp(11px, 5cqi, 13px);
  line-height: 1.2;
  margin-top: 0;
}

.level-pill,
.tag,
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 999px;
  min-height: 28px;
  padding: 0 10px;
  font-size: 12px;
  font-weight: 750;
}

.level-pill {
  color: var(--navy);
  background: #e7eff4;
}

.tag {
  color: var(--teal);
  background: var(--mint);
}

.tag.warn {
  color: #8b5e1a;
  background: #fff2d9;
}

.tag.bad {
  color: #9b3741;
  background: #ffe8eb;
}

.status-pill {
  color: var(--blue);
  background: #e8f0fb;
}

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

.dimension-row {
  display: grid;
  gap: 8px;
}

.dimension-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.mini-bar {
  height: 9px;
  border-radius: 999px;
  background: #e6edf2;
  overflow: hidden;
}

.mini-bar span {
  display: block;
  height: 100%;
  width: var(--value);
  background: linear-gradient(90deg, var(--teal), var(--gold));
}

.radar {
  width: 100%;
  height: auto;
  display: block;
  margin-top: 2px;
  overflow: visible;
}

.radar-label {
  letter-spacing: 0;
}

.radar-score-label {
  paint-order: stroke;
  stroke: rgba(255, 255, 255, 0.82);
  stroke-width: 4px;
  stroke-linejoin: round;
  letter-spacing: 0;
}

.radar .radar-before {
  fill: rgba(47, 111, 189, 0.16);
  stroke: #2f6fbd;
}

.radar .radar-after {
  fill: rgba(32, 201, 151, 0.24);
  stroke: var(--teal);
}

.radar-preview .radar-after {
  fill: rgba(255, 255, 255, 0.18);
  stroke: #ffffff;
}

.course-screen {
  width: min(1180px, 100%);
}

.course-page {
  min-height: 100vh;
  padding-bottom: 96px;
  background: var(--bg-secondary);
}

.video-stage {
  background: #2f2f31;
  padding: 18px 16px 22px;
}

.video-stage-inner {
  width: min(980px, 100%);
  margin: 0 auto;
}

.video-stage .video-box {
  border-radius: 0;
  box-shadow: none;
  max-height: 520px;
}

.course-info-strip {
  background: #2f2f31;
  color: #fff;
  padding: 12px 16px;
}

.course-info-inner {
  width: min(980px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "title material"
    "nav nav";
  gap: 10px 18px;
  align-items: center;
}

.course-info-inner > div:first-child {
  grid-area: title;
}

.course-info-inner > .ppt-button {
  grid-area: material;
  justify-self: end;
}

.course-info-inner h1 {
  margin: 0 0 4px;
  font: 600 18px/1.25 -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", sans-serif;
  color: #fff;
}

.course-info-inner p {
  margin: 0;
  color: rgba(255,255,255,.78);
  font: var(--text-caption);
}

.lesson-marquee,
.playing-line {
  position: relative;
  --marquee-box: min(420px, 58vw);
  width: var(--marquee-box);
  overflow: hidden;
  color: rgba(255,255,255,.78);
  font: var(--text-caption);
  white-space: nowrap;
}

.playing-line {
  display: flex;
  align-items: center;
  gap: 0;
}

.playing-line strong {
  flex: 0 0 auto;
  color: #d7b56d;
  font-weight: 700;
}

.lesson-marquee span,
.playing-line span {
  display: inline-block;
  min-width: max-content;
  padding-right: 44px;
}

.lesson-marquee.long span {
  animation: marqueeTitle 10s linear infinite;
}

.playing-line span {
  animation: playingMarquee 8s ease-in-out infinite;
}

.lesson-marquee::after,
.playing-line::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 42px;
  height: 100%;
  background: linear-gradient(90deg, rgba(47,47,49,0), #2f2f31);
}

.course-info-inner .muted {
  color: rgba(255,255,255,.48);
}

.course-info-actions {
  grid-area: nav;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  min-height: 22px;
  padding-top: 2px;
}

.playing-status {
  color: #79a7ff;
  font-weight: 700;
  white-space: nowrap;
}

.playing-status::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 6px;
  border-radius: 50%;
  background: #3f7cff;
  vertical-align: middle;
}

.ppt-button {
  min-height: 28px;
  padding: 0 12px;
  border: 1px solid rgba(215, 181, 109, 0.78);
  border-radius: 999px;
  color: #f0d083;
  background: rgba(215, 181, 109, 0.12);
  font-size: 13px;
  font-weight: 700;
  box-shadow: none;
}

.course-info-actions .ghost-button {
  min-height: 34px;
  color: #fff;
  background: rgba(255,255,255,.12);
}

.course-info-actions .link-button {
  color: rgba(255,255,255,.62);
  font-size: 13px;
  min-height: 22px;
}

.course-content-shell {
  width: min(980px, 100%);
  margin: 18px auto 0;
  padding: 0 16px;
}

.course-content-shell .curriculum-panel {
  max-width: 720px;
}

.course-page > .sticky-actions {
  display: block;
}

.course-hero,
.course-titlebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  min-height: auto;
  margin-bottom: var(--space-lg);
  padding: 0 0 var(--space-md);
  border-bottom: 1px solid var(--line);
}

.course-hero h1,
.course-titlebar h1 {
  margin: 0 0 var(--space-xs);
  font: var(--text-title);
}

.course-hero p,
.course-titlebar p,
.course-time {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.now-playing-compact {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  margin-top: 0;
  padding: var(--space-sm) 2px var(--space-md);
  border-bottom: 1px solid rgba(60, 60, 67, 0.1);
}

.now-playing-compact h2 {
  margin: var(--space-xs) 0 2px;
  font: var(--text-subtitle);
}

.now-playing-compact p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.playing-dot {
  color: var(--navy);
  font-size: 13px;
  font-weight: 700;
}

.playing-dot::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 6px;
  border-radius: 50%;
  background: var(--navy);
  vertical-align: middle;
}

.course-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 400px;
  gap: var(--space-lg);
  align-items: start;
}

.player-panel {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 28px;
  background: rgba(255,255,255,.82);
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
}

.player-course-head h1 {
  margin: 0;
  font: var(--text-title);
}

.player-course-head p {
  margin: 4px 0 0;
  color: var(--muted);
  font: var(--text-caption);
}

.player-meta {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: start;
}

.player-meta h2 {
  margin: 4px 0 2px;
  font: var(--text-subtitle);
}

.player-meta p {
  margin: 0;
  color: var(--muted);
  font: var(--text-caption);
}

.player-actions {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 38px;
  padding-top: 6px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.player-actions .link-button:last-child {
  justify-self: end;
}

.player-material {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 42px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
  font-weight: 700;
}

.player-material .secondary-button {
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
}

.video-box {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-large);
  overflow: hidden;
  background:
    linear-gradient(0deg, rgba(9, 36, 71, 0.52), rgba(9, 36, 71, 0.18)),
    linear-gradient(135deg, var(--navy), var(--navy-deep) 54%, var(--teal));
  box-shadow: var(--shadow);
  color: #fff;
}

.course-nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 46px;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.course-nav .link-button:last-child {
  justify-self: end;
}

.material-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  box-shadow: none;
  border-radius: var(--radius-card);
}

.material-strip h2 {
  font-size: 14px;
}

.material-strip .secondary-button {
  min-height: 34px;
  padding: 0 12px;
  border-radius: 12px;
}

.curriculum-panel {
  padding: var(--space-md);
  border-radius: var(--radius-large);
}

.curriculum-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
  padding: var(--space-xs);
  border-radius: 980px;
  background: rgba(118, 118, 128, 0.12);
}

.segmented button {
  min-height: 36px;
  border: 0;
  border-radius: 980px;
  color: var(--muted);
  background: transparent;
  font-weight: 700;
}

.segmented button.active {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
}

.curriculum-head h2 {
  margin: 0;
}

.unit-list.compact {
  gap: var(--space-sm);
}

.unit-card.compact {
  padding: 0;
  overflow: hidden;
  box-shadow: none;
}

.unit-card.active-unit {
  background: rgba(0, 122, 255, 0.08);
  border-color: rgba(0, 122, 255, 0.18);
}

.unit-toggle {
  width: 100%;
  min-height: 52px;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 0;
  background: transparent;
  color: var(--ink);
  text-align: left;
  font-weight: 750;
}

.unit-meta {
  color: #a0a8b4;
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
}

.path-unit-head .unit-meta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
}

.path-unit-head .unit-meta em {
  min-height: 24px;
  display: inline-flex;
  align-items: center;
  padding: 0 9px;
  border-radius: 999px;
  background: rgba(215, 181, 109, 0.18);
  color: #9a6a16;
  font-style: normal;
  font-weight: 800;
  letter-spacing: 0;
}

.path-unit-head .unit-meta i {
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(118, 118, 128, 0.1);
  color: #8f98a7;
  font-style: normal;
  font-size: 0;
  line-height: 1;
}

.path-unit-head .unit-meta i::before {
  content: "";
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 7px solid #8f98a7;
}

.path-unit-head .unit-meta i.open::before {
  transform: rotate(180deg);
}

.lesson-list.compact {
  padding: 0 var(--space-sm) var(--space-sm);
}

.lesson-item.compact {
  min-height: 54px;
  border-color: transparent;
  box-shadow: none;
  grid-template-columns: 34px 1fr auto;
}

.unit-test-link {
  width: calc(100% - 24px);
  min-height: 38px;
  margin: 0 12px 12px;
  border: 0;
  border-radius: 14px;
  color: var(--navy);
  background: var(--primary-soft);
}

.unit-test-list {
  display: grid;
  gap: var(--space-sm);
}

.unit-test-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-md);
  align-items: center;
  padding: var(--space-md);
  border: 1px solid rgba(60, 60, 67, 0.1);
  border-radius: var(--radius-card);
  background: rgba(255, 255, 255, 0.82);
}

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

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

.unit-test-card .primary-button,
.unit-test-card .ghost-button {
  min-height: 36px;
  padding: 0 12px;
  border-radius: 12px;
  white-space: nowrap;
}

.course-footer-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 14px;
}

.report-link {
  width: 100%;
  margin-top: 12px;
  border: 0;
  background: transparent;
  color: #9aa3b1;
  min-height: 36px;
}

.video-box iframe,
.video-box video {
  width: 100%;
  height: 100%;
  border: 0;
}

.video-placeholder {
  height: 100%;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 26px;
}

.play-mark {
  width: 70px;
  height: 70px;
  margin: 0 auto 18px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.28);
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.13);
}

.play-mark::before {
  content: "";
  width: 0;
  height: 0;
  border-top: 13px solid transparent;
  border-bottom: 13px solid transparent;
  border-left: 20px solid #fff;
  margin-left: 4px;
}

.unit-list,
.lesson-list,
.answer-grid,
.stats-grid {
  display: grid;
  gap: 10px;
}

.unit-card,
.lesson-item,
.answer-card,
.stat-card,
.admin-row {
  border: 1px solid rgba(60, 60, 67, 0.1);
  background: rgba(255, 255, 255, 0.82);
  border-radius: 16px;
}

.unit-card {
  padding: 14px;
}

.recommend-card {
  position: relative;
  padding: 12px 14px;
  min-height: 104px;
}

.recommend-card .unit-head {
  padding-right: 112px;
  min-height: 72px;
  align-items: center;
}

.recommend-card h3 {
  font-size: 17px;
  line-height: 1.35;
}

.recommend-card p {
  margin: 8px 0 0;
  line-height: 1.55;
}

.recommend-card .secondary-button {
  position: absolute;
  right: 14px;
  top: 50%;
  bottom: auto;
  transform: translateY(-50%);
  min-height: 36px;
  padding: 0 16px;
  border-radius: 999px;
  font-size: 14px;
}

.recommend-card .secondary-button:hover {
  transform: translateY(-50%);
}

.unit-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: start;
}

.unit-card h3,
.panel h2,
.panel h3 {
  margin: 0;
}

.panel h2 {
  font-size: 19px;
}

.panel h3 {
  font-size: 16px;
}

.muted {
  color: var(--muted);
}

.small {
  font-size: 13px;
}

.lesson-item {
  width: 100%;
  display: grid;
  grid-template-columns: 28px 1fr auto;
  gap: 10px;
  align-items: center;
  min-height: 58px;
  padding: 10px;
  text-align: left;
  color: var(--ink);
}

.lesson-item.active {
  border-color: rgba(0, 122, 255, 0.18);
  background: rgba(0, 122, 255, 0.09);
}

.lesson-num {
  width: 24px;
  height: auto;
  border-radius: 0;
  background: transparent;
  display: block;
  color: #8e8e93;
  font-weight: 800;
  font-size: 13px;
}

.material-qr {
  width: 176px;
  height: 176px;
  margin: 8px auto 4px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 18px;
  background:
    linear-gradient(90deg, #111 10px, transparent 10px) 0 0 / 24px 24px,
    linear-gradient(#111 10px, transparent 10px) 0 0 / 24px 24px,
    #fff;
}

.material-qr-real {
  overflow: hidden;
  background: #fff;
  box-shadow: inset 0 0 0 1px rgba(60, 60, 67, 0.06);
}

.material-qr-real img {
  display: block;
  width: 100%;
  height: 100%;
  padding: 8px;
  object-fit: contain;
}

.material-qr-empty {
  color: var(--muted);
  font-weight: 800;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: rgba(0, 0, 0, 0.28);
  display: grid;
  place-items: center;
  padding: 18px;
}

.modal {
  width: min(420px, 100%);
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 24px;
  padding: 20px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(24px) saturate(180%);
}

.material-modal {
  position: relative;
  width: min(360px, 100%);
  display: grid;
  gap: 14px;
  padding: 22px 18px 18px;
  text-align: center;
}

.material-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  border: 0;
  border-radius: 50%;
  color: var(--muted);
  background: rgba(118, 118, 128, 0.1);
  font-size: 18px;
  line-height: 1;
}

.material-modal-head {
  display: grid;
  justify-items: center;
  gap: 8px;
  padding: 0 28px;
}

.material-modal h2 {
  margin: 0;
  font-size: 20px;
  line-height: 1.25;
}

.material-modal-head p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.keyword-box {
  display: grid;
  justify-items: center;
  gap: 8px;
  margin-top: 2px;
}

.keyword-box span,
.material-note {
  color: var(--muted);
  font-size: 13px;
}

.keyword-box strong {
  min-width: 112px;
  min-height: 42px;
  padding: 0 18px;
  display: inline-grid;
  place-items: center;
  border-radius: 12px;
  color: var(--navy);
  background: linear-gradient(180deg, rgba(36, 84, 214, 0.12), rgba(36, 84, 214, 0.07));
  font-size: 18px;
  letter-spacing: 0.4px;
}

.material-note {
  margin: 0;
  line-height: 1.6;
}

.answer-card {
  overflow: hidden;
}

.answer-summary {
  width: 100%;
  min-height: 48px;
  padding: 12px;
  border: 0;
  background: #fff;
  color: var(--ink);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  text-align: left;
}

.answer-summary.correct {
  border-left: 4px solid var(--green);
}

.answer-summary.wrong {
  border-left: 4px solid var(--rose);
}

.answer-detail {
  border-top: 1px solid var(--line);
  padding: 12px;
  background: #fbfcfd;
}

.answer-review {
  display: grid;
  gap: var(--space-md);
}

.answer-review-head {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  color: var(--text-secondary);
  font: var(--text-caption);
}

.answer-review-head h3 {
  margin: 0 auto 0 0;
  color: var(--ink);
}

.answer-review-head strong {
  color: #ff3b3b;
}

.answer-overview {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(48px, 1fr));
  gap: 7px;
}

.answer-tile {
  min-height: 50px;
  border: 1px solid transparent;
  border-radius: 13px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 2px;
  font-size: 14px;
  font-weight: 800;
}

.answer-tile span {
  font-size: 12px;
  line-height: 1;
}

.answer-tile.right {
  color: #18b957;
  background: #e8f8ee;
}

.answer-tile.wrong {
  color: #ff3b3b;
  background: #fde9e9;
}

.answer-tile.active {
  border-color: var(--navy);
  box-shadow: 0 0 0 1px var(--navy) inset;
}

.answer-focus {
  padding: var(--space-md);
  border-radius: var(--radius-card);
  background: var(--surface-soft);
}

.answer-focus-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.answer-focus h3 {
  margin: 0 0 var(--space-md);
  line-height: 1.5;
}

.ability-lift-line {
  margin: -4px 0 12px;
  text-align: center;
  font-size: 15px;
  font-weight: 800;
}

.lift-up {
  color: #19b89d;
}

.lift-down {
  color: #d95c68;
}

.lift-flat {
  color: #86868b;
}

.ability-unit-detail {
  padding: 0;
  overflow: hidden;
}

.ability-unit-detail > summary {
  list-style: none;
  cursor: pointer;
  padding: 14px;
}

.ability-unit-detail > summary::-webkit-details-marker {
  display: none;
}

.ability-unit-detail .answer-review {
  padding: 0 14px 14px;
}

.ability-unit-detail[open] summary .ghost-button {
  color: var(--muted);
}

.ability-compare {
  display: grid;
  gap: 12px;
}

.ability-compare h2 {
  margin: 0;
  font-size: 17px;
}

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

.ability-compare-row {
  display: grid;
  gap: 7px;
  padding: 12px;
  border-radius: 16px;
  background: rgba(245, 245, 247, 0.8);
  border: 1px solid rgba(60, 60, 67, 0.08);
}

.ability-compare-head,
.ability-score-pair {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.ability-compare-head strong {
  font-size: 14px;
  line-height: 1.35;
}

.ability-compare-head span {
  flex: 0 0 auto;
  font-size: 12px;
  font-weight: 800;
}

.ability-compare-head .up {
  color: #19b89d;
}

.ability-compare-head .down {
  color: #d95c68;
}

.ability-compare-head .flat {
  color: #86868b;
}

.ability-compare-head .pending {
  color: #d97706;
}

.ability-score-pair {
  justify-content: flex-end;
  color: #8f98a7;
  font-size: 12px;
  font-weight: 800;
}

.ability-score-pair span:last-child {
  color: var(--navy);
}

.dual-bars {
  display: grid;
  gap: 5px;
}

.dual-bars > div {
  height: 7px;
  overflow: hidden;
  border-radius: 999px;
  background: #e2e8f0;
}

.dual-bars span {
  display: block;
  height: 100%;
  width: var(--value);
  border-radius: inherit;
}

.bar-before span {
  background: #c6ccd6;
}

.bar-after span {
  background: var(--navy);
}

.ability-learn-link {
  width: max-content;
  min-height: 28px;
  padding: 0 10px;
  border: 0;
  border-radius: 999px;
  background: #fff3e4;
  color: #f97316;
  font-size: 12px;
  font-weight: 800;
}

.review-options {
  display: grid;
  gap: 8px;
}

.review-option {
  min-height: 44px;
  display: grid;
  grid-template-columns: 26px 1fr auto;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 12px;
  border-radius: 14px;
  color: #8b93a0;
  background: #fff;
  border: 1px solid transparent;
}

.review-option.correct {
  color: #16a34a;
  background: #effaf2;
  border-color: #b9ecc7;
}

.review-option.picked-wrong {
  color: #d97706;
  background: #fff7ed;
  border-color: #fed7aa;
}

.review-option em {
  padding: 4px 8px;
  border-radius: 7px;
  color: #fff;
  background: #22c55e;
  font-size: 12px;
  font-style: normal;
  font-weight: 800;
}

.review-option em.orange {
  background: #f59e0b;
}

.analysis-box {
  margin-top: var(--space-md);
  padding: var(--space-md);
  border-left: 3px solid var(--navy);
  border-radius: 14px;
  background: rgba(255,255,255,.86);
}

.analysis-box strong {
  color: var(--navy);
}

.analysis-box p {
  margin: var(--space-sm) 0 0;
  color: var(--text-primary);
  line-height: 1.7;
}

.profile-backdrop {
  align-items: center;
}

.profile-modal {
  width: min(520px, 100%);
  border-radius: 24px;
  padding: 22px;
}

.modal-title-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: start;
}

.muted-shell {
  opacity: 0.36;
}

.share-modal {
  display: grid;
  gap: 10px;
  text-align: center;
}

.share-modal h2 {
  margin: 0;
  font-size: 22px;
  line-height: 1.2;
}

.share-modal p {
  margin: 0;
  line-height: 1.55;
}

.wechat-button {
  border: 0;
  border-radius: 980px;
  min-height: 48px;
  color: #fff;
  background: #10c466;
  font-weight: 750;
}

.copy-box {
  padding: 16px;
  border-radius: 14px;
  background: #f6f7fa;
  color: #1f2937;
  text-align: left;
  line-height: 1.55;
  white-space: pre-wrap;
}

.share-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.share-arrow {
  width: 48px;
  height: 48px;
  margin: 0 auto 2px;
  display: grid;
  place-items: center;
  border: 2px solid #111827;
  background: var(--navy);
  color: #fff;
  font-size: 28px;
  font-weight: 800;
}

.wechat-guide-lines {
  display: grid;
  gap: 4px;
  margin: 2px 0 8px;
}

.learning-path {
  position: relative;
  display: grid;
  gap: var(--space-sm);
}

.learning-path::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 28px;
  bottom: 28px;
  width: 1px;
  background: var(--separator);
}

.path-unit {
  position: relative;
}

.path-unit-head {
  position: relative;
  width: 100%;
  min-height: 58px;
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  border: 0;
  background: transparent;
  color: var(--text-primary);
  text-align: left;
  padding: 4px 0;
}

.path-node {
  position: relative;
  z-index: 1;
  width: 34px;
  height: 34px;
  margin-left: 0;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, #3f3f46, #686872);
  color: #fff;
  font-size: 16px;
  font-weight: 800;
  box-shadow: 0 0 0 6px var(--bg-secondary);
}

.path-unit.active-unit .path-node {
  background: linear-gradient(145deg, #2454d6, #4f7dff);
  box-shadow: 0 0 0 6px var(--bg-secondary), 0 8px 18px rgba(36, 84, 214, 0.22);
}

.path-title {
  font-weight: 700;
  font-size: 17px;
  line-height: 1.35;
  min-width: 0;
}

.path-lessons {
  display: grid;
  gap: var(--space-sm);
  margin-left: 46px;
  padding-bottom: var(--space-sm);
}

.path-lesson {
  width: 100%;
  min-height: 58px;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) 52px;
  gap: 8px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid transparent;
  border-radius: 18px;
  background: rgba(255,255,255,.6);
  color: var(--text-primary);
  text-align: left;
}

.path-lesson.active {
  background: rgba(36,84,214,.08);
  border-color: rgba(36,84,214,.16);
}

.path-lesson strong {
  display: block;
  font-size: 15px;
  line-height: 1.35;
}

.path-lesson small {
  display: block;
  margin-top: 3px;
  color: var(--text-secondary);
  font: var(--text-caption);
  line-height: 1.35;
}

.path-lesson .status-pill {
  min-height: 24px;
  padding: 0 8px;
  justify-self: end;
  font-size: 12px;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes marqueeTitle {
  0%, 18% { transform: translateX(0); }
  82%, 100% { transform: translateX(-45%); }
}

@keyframes playingMarquee {
  0%, 16% { transform: translateX(0); }
  48%, 64% { transform: translateX(min(0px, calc(var(--marquee-box) - 100%))); }
  100% { transform: translateX(0); }
}

.compare-bars {
  display: grid;
  gap: var(--space-md);
}

.compare-row {
  display: grid;
  gap: 8px;
}

.bar-line {
  display: grid;
  grid-template-columns: 76px 1fr 42px;
  gap: 8px;
  align-items: center;
  font-size: 13px;
  color: var(--muted);
}

.bar-line .bar {
  height: 8px;
  border-radius: 999px;
  background: #e6edf2;
  overflow: hidden;
}

.bar-line .bar span {
  display: block;
  height: 100%;
  width: var(--value);
  background: var(--blue);
}

.bar-line.after .bar span {
  background: var(--teal);
}

.empty {
  min-height: 140px;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--muted);
}

.version-warning {
  min-height: 260px;
}

.version-warning h2 {
  color: var(--rose);
}

.version-warning p {
  max-width: 560px;
  margin: 8px auto;
  line-height: 1.7;
}

.version-warning .primary-button {
  margin-top: 12px;
}

.loading-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 12px;
  color: var(--muted);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 86px;
  z-index: 80;
  min-width: 180px;
  max-width: calc(100vw - 36px);
  transform: translate(-50%, 18px);
  opacity: 0;
  pointer-events: none;
  padding: 10px 14px;
  border-radius: 8px;
  background: rgba(23, 33, 47, 0.92);
  color: #fff;
  text-align: center;
  transition: 180ms ease;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: min(420px, 100%);
  display: grid;
  gap: 16px;
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow-deep);
  backdrop-filter: blur(24px) saturate(180%);
}

.login-card .brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
}

.login-card h1,
.login-card p {
  margin: 0;
}

.login-card p {
  color: var(--muted);
}

.login-card .primary-button {
  width: 100%;
}

.login-error {
  min-height: 20px;
  color: var(--rose);
  font-size: 13px;
  text-align: center;
}

.admin-header {
  background: var(--navy);
  color: #fff;
  padding: 22px 18px;
}

.admin-header .inner {
  width: min(1160px, 100%);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.admin-header h1 {
  margin: 0;
  font-size: 24px;
}

.admin-main {
  width: min(1160px, 100%);
  margin: 0 auto;
  padding: 18px;
}

.stats-grid {
  grid-template-columns: repeat(6, minmax(0, 1fr));
  margin-bottom: 16px;
}

.stat-card {
  padding: 14px;
}

.stat-card strong {
  display: block;
  font-size: 24px;
}

.admin-layout {
  display: grid;
  grid-template-columns: 410px 1fr;
  gap: 16px;
  align-items: start;
}

.admin-list {
  display: grid;
  gap: 10px;
  max-height: calc(100vh - 210px);
  overflow: auto;
  padding-right: 4px;
}

.admin-row {
  width: 100%;
  padding: 12px;
  color: var(--ink);
  text-align: left;
}

.admin-row.active {
  border-color: var(--teal);
  background: #f0faf7;
}

.admin-row-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

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

.admin-top p {
  margin: 6px 0 0;
  color: rgba(255, 255, 255, 0.76);
}

.admin-header-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: flex-end;
}

.admin-course-select {
  min-height: 44px;
  min-width: 220px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 999px;
  padding: 0 14px;
  color: #fff;
  background: rgba(255, 255, 255, 0.14);
  outline: none;
}

.admin-course-select option {
  color: var(--ink);
  background: #fff;
}

.admin-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding: 6px;
  border: 1px solid rgba(60, 60, 67, 0.08);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow);
}

.admin-tabs button,
.admin-preview-link {
  min-height: 40px;
  border: 0;
  border-radius: 14px;
  padding: 0 18px;
  color: var(--muted);
  background: transparent;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 750;
}

.admin-tabs button.active {
  color: var(--navy);
  background: #fff;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.admin-preview-link {
  margin-left: auto;
  color: var(--navy);
  background: var(--primary-soft);
}

.admin-config-layout {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.config-side {
  position: sticky;
  top: 16px;
  display: grid;
  gap: 6px;
  padding: 10px;
}

.config-nav {
  width: 100%;
  min-height: 42px;
  border: 0;
  border-radius: 13px;
  padding: 0 12px;
  color: var(--muted);
  background: transparent;
  text-align: left;
  font-weight: 750;
}

.config-nav.active {
  color: var(--navy);
  background: var(--primary-soft);
}

.config-panel,
.config-list,
.lesson-config-list {
  display: grid;
  gap: 14px;
}

.config-section {
  display: grid;
  gap: 16px;
}

.config-section-head,
.config-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.config-section-head h2 {
  margin: 0;
}

.config-section-head p,
.config-card-head p {
  margin: 5px 0 0;
}

.admin-form-grid {
  display: grid;
  gap: 12px;
}

.admin-form-grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.admin-form-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.admin-form-grid.four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.config-card {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid rgba(60, 60, 67, 0.1);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.78);
}

.config-card.compact {
  padding: 14px;
}

.asset-field {
  min-width: 0;
}

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

.upload-button {
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.upload-button input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.asset-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.asset-filter {
  min-height: 36px;
  border: 0;
  border-radius: 999px;
  padding: 0 14px;
  color: var(--muted);
  background: rgba(118, 118, 128, 0.12);
  font-weight: 750;
}

.asset-filter.active {
  color: var(--navy);
  background: var(--primary-soft);
}

.asset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}

.asset-grid.picker {
  max-height: min(62vh, 620px);
  overflow: auto;
  padding-right: 4px;
}

.asset-card {
  overflow: hidden;
  border: 1px solid rgba(60, 60, 67, 0.1);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.04);
}

.asset-preview {
  height: 150px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #f5f7fb, #eef3ff);
}

.asset-preview img,
.asset-preview video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.asset-file-icon {
  min-width: 72px;
  min-height: 72px;
  border-radius: 20px;
  display: grid;
  place-items: center;
  color: var(--navy);
  background: #fff;
  border: 1px solid rgba(60, 60, 67, 0.1);
  font-weight: 900;
  text-transform: uppercase;
}

.asset-body {
  display: grid;
  gap: 8px;
  padding: 12px;
}

.asset-body strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.asset-body p {
  margin: 0;
}

.asset-body code {
  overflow: hidden;
  padding: 8px 10px;
  border-radius: 12px;
  color: var(--muted);
  background: var(--surface-soft);
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

.admin-modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(0, 0, 0, 0.36);
  backdrop-filter: blur(10px);
}

.admin-modal {
  width: min(980px, 100%);
  max-height: calc(100vh - 48px);
  overflow: auto;
  border-radius: 24px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.22);
}

.asset-picker {
  display: grid;
  gap: 14px;
}

.asset-picker-upload {
  display: flex;
  justify-content: flex-end;
}

.config-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.config-actions.end {
  align-items: end;
  justify-content: flex-end;
}

.small-button {
  min-height: 34px;
  width: max-content;
  padding: 0 12px;
  border-radius: 999px;
}

.check-field {
  align-content: end;
}

.check-field input {
  width: 22px;
  height: 22px;
  min-height: 22px;
}

.binding-board {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

.binding-board div,
.binding-note,
.auto-id-note,
.wechat-config-box {
  border-radius: 16px;
  padding: 12px;
  background: var(--surface-soft);
  border: 1px solid rgba(60, 60, 67, 0.08);
}

.binding-board strong,
.binding-board span {
  display: block;
}

.binding-board span {
  margin-top: 5px;
  color: var(--muted);
  font-size: 12px;
}

.lesson-config-row {
  display: grid;
  gap: 10px;
  padding: 12px;
  border-radius: 16px;
  background: rgba(245, 245, 247, 0.72);
}

.question-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.question-toolbar span {
  margin-right: auto;
  color: var(--muted);
  font-weight: 750;
}

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

.option-config-row {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 8px;
  align-items: center;
}

.option-config-row input[type="text"],
.option-config-row input:not([type]) {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0 12px;
  outline: none;
}

.check-dot {
  min-height: 42px;
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 6px;
  align-items: center;
  padding: 0 10px;
  border-radius: 12px;
  background: var(--primary-soft);
  color: var(--navy);
  font-weight: 800;
}

.option-config-grid.judge {
  grid-template-columns: repeat(2, minmax(0, 160px));
}

.judge-choice {
  min-height: 46px;
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 8px;
  align-items: center;
  padding: 0 14px;
  border-radius: 14px;
  color: var(--navy);
  background: var(--primary-soft);
  font-size: 20px;
  font-weight: 900;
}

.binding-note {
  color: var(--navy);
  font-size: 13px;
  font-weight: 750;
}

.auto-id-note {
  display: grid;
  gap: 6px;
  align-content: center;
  min-height: 74px;
}

.auto-id-note span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 750;
}

.auto-id-note code {
  width: max-content;
  max-width: 100%;
  padding: 4px 8px;
  border-radius: 8px;
  color: var(--navy);
  background: rgba(36, 84, 214, 0.08);
  overflow: hidden;
  text-overflow: ellipsis;
}

.wechat-config-box {
  display: grid;
  gap: 8px;
  line-height: 1.7;
}

.wechat-config-box h3,
.wechat-config-box p {
  margin: 0;
}

.save-bar {
  position: sticky;
  bottom: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 14px;
  border: 1px solid rgba(60, 60, 67, 0.08);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 -8px 24px rgba(0, 0, 0, 0.06);
  backdrop-filter: blur(22px);
}

.save-bar strong,
.save-bar span {
  display: block;
}

.save-bar span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
}

.manage-grid,
.publish-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 16px;
  align-items: start;
}

.course-manage-list,
.course-question-stat-list,
.question-stat-list {
  display: grid;
  gap: 12px;
}

.course-manage-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  padding: 16px;
  border: 1px solid rgba(60, 60, 67, 0.1);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.78);
}

.course-manage-card.active {
  border-color: rgba(36, 84, 214, 0.24);
  background: rgba(36, 84, 214, 0.06);
}

.course-manage-card h3 {
  margin: 0;
  font-size: 18px;
}

.course-manage-card code {
  display: block;
  width: max-content;
  max-width: 100%;
  margin-top: 10px;
  padding: 6px 9px;
  border-radius: 10px;
  color: var(--navy);
  background: var(--primary-soft);
  overflow: hidden;
  text-overflow: ellipsis;
}

.course-manage-meta,
.course-manage-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.course-manage-meta {
  margin-top: 10px;
}

.course-manage-meta span {
  min-height: 26px;
  padding: 0 9px;
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  color: var(--muted);
  background: rgba(118, 118, 128, 0.1);
  font-size: 12px;
  font-weight: 750;
}

.course-manage-actions {
  justify-content: flex-end;
  max-width: 270px;
}

.course-manage-actions .primary-button,
.course-manage-actions .ghost-button,
.course-manage-actions .danger-button {
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 13px;
}

.publish-steps {
  display: grid;
  gap: 12px;
  line-height: 1.7;
}

.publish-steps.compact {
  gap: 8px;
}

.publish-steps p {
  margin: 0;
}

.publish-steps code {
  padding: 2px 6px;
  border-radius: 7px;
  color: var(--navy);
  background: var(--primary-soft);
}

.switch-field {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--navy);
  font-weight: 800;
}

.switch-field input {
  width: 20px;
  height: 20px;
}

.score-monitor-table {
  display: grid;
  gap: 8px;
}

.score-monitor-head,
.score-monitor-row {
  display: grid;
  grid-template-columns: 1.1fr 1.8fr .7fr .7fr .7fr .7fr;
  gap: 10px;
  align-items: center;
}

.score-monitor-head {
  min-height: 36px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.score-monitor-row {
  min-height: 54px;
  padding: 10px 12px;
  border: 1px solid rgba(60, 60, 67, 0.08);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.78);
}

.question-stat-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 74px;
  gap: 10px 16px;
  align-items: center;
  padding: 14px;
  border: 1px solid rgba(60, 60, 67, 0.08);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.78);
}

.course-question-card {
  gap: 14px;
}

.question-stat-section {
  display: grid;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px solid rgba(60, 60, 67, 0.08);
}

.question-stat-section h3 {
  margin: 0;
  font-size: 15px;
}

.question-stat-row .mini-bar {
  grid-column: 1 / -1;
}

.question-stat-score {
  justify-self: end;
  color: var(--teal);
  font-size: 20px;
  font-weight: 900;
}

.question-stat-score.warn {
  color: var(--warning);
}

.question-stat-score.bad {
  color: var(--rose);
}

@media (max-width: 900px) {
  .hero-band,
  .result-layout,
  .course-layout,
  .admin-layout {
    grid-template-columns: 1fr;
  }

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

  .hero-band h1,
  .section-title h1 {
    font-size: 25px;
  }

  .admin-list {
    max-height: none;
  }

  .admin-header .inner,
  .admin-header-actions {
    align-items: stretch;
  }

  .admin-header .inner {
    flex-direction: column;
  }

  .admin-course-select,
  .admin-header-actions .primary-button,
  .admin-header-actions .ghost-button {
    width: 100%;
  }

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

  .manage-grid,
  .publish-grid {
    grid-template-columns: 1fr;
  }

  .config-side {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .admin-form-grid.three,
  .admin-form-grid.four {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .course-manage-card,
  .score-monitor-head,
  .score-monitor-row {
    grid-template-columns: 1fr;
  }

  .score-monitor-head {
    display: none;
  }
}

@media (max-width: 560px) {
  .screen {
    padding: 14px 14px 92px;
  }

  .assessment-home {
    padding: 20px 14px 116px;
  }

  .hero-band,
  .intro-body,
  .panel,
  .question-panel {
    padding: 16px;
  }

  .result-layout {
    gap: 12px;
  }

  .result-layout > .panel:first-child {
    gap: 8px;
  }

  .score-ring {
    width: 156px;
    height: 156px;
  }

  .score-ring strong {
    font-size: clamp(30px, 18cqi, 42px);
    line-height: 1.05;
  }

  .hero-visual,
  .grid.two {
    grid-template-columns: 1fr;
  }

  .button-row {
    display: grid;
    grid-template-columns: 1fr;
  }

  .sticky-actions .inner {
    grid-template-columns: 1fr;
  }

  .sticky-actions .inner.quiz-nav {
    grid-template-columns: 1fr 1fr;
  }

  .lesson-item {
    grid-template-columns: 34px 1fr;
  }

  .lesson-item.compact {
    grid-template-columns: 34px 1fr;
  }

  .lesson-item .status-pill,
  .lesson-item .tag {
    grid-column: 2;
    width: max-content;
  }

  .unit-test-card {
    grid-template-columns: 1fr;
  }

  .unit-test-card .primary-button,
  .unit-test-card .ghost-button {
    width: 100%;
  }

  .profile-modal {
    width: 100%;
    border-radius: 24px 24px 0 0;
    max-height: 88vh;
    overflow: auto;
  }

  .course-screen {
    padding: 18px 14px 96px;
  }

  .course-page {
    padding-bottom: 96px;
  }

  .video-stage {
    padding: 0;
  }

  .video-stage .video-box {
    border-radius: 0;
    max-height: none;
  }

  .course-info-strip {
    padding: 9px 14px 7px;
  }

  .course-info-inner {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "title material"
      "nav nav";
    gap: 8px 10px;
  }

  .course-info-inner h1 {
    font-size: 18px;
    line-height: 1.2;
  }

  .course-info-inner p {
    max-width: 260px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
  }

  .lesson-marquee,
  .playing-line {
    --marquee-box: min(240px, 62vw);
  }

  .playing-status {
    justify-self: end;
    font-size: 13px;
  }

  .course-info-actions {
    grid-area: nav;
    display: flex;
    justify-content: stretch;
    gap: 0;
    min-height: 22px;
  }

  .course-info-actions .link-button {
    width: 50%;
    justify-content: center;
  }

  .ppt-button {
    min-height: 28px;
    padding: 0 10px;
    font-size: 12px;
  }

  .course-content-shell {
    margin-top: 12px;
    padding: 0 12px;
    display: block;
  }

  .course-content-shell .curriculum-panel {
    max-width: none;
  }

  .course-titlebar {
    margin-bottom: 12px;
    padding-bottom: 12px;
  }

  .course-titlebar h1 {
    font-size: 26px;
    line-height: 1.18;
  }

  .course-layout {
    gap: 12px;
  }

  .player-panel {
    padding: 14px;
    border-radius: 24px;
    gap: 10px;
  }

  .player-course-head h1 {
    font-size: 25px;
    line-height: 1.16;
  }

  .video-box {
    border-radius: 20px;
    max-height: 188px;
  }

  .video-placeholder {
    padding: 16px;
  }

  .video-placeholder h2 {
    margin: 10px 0 0;
    font-size: 22px;
    line-height: 1.2;
  }

  .video-placeholder p {
    display: none;
  }

  .play-mark {
    width: 58px;
    height: 58px;
    margin-bottom: 8px;
  }

  .player-meta h2 {
    font-size: 18px;
    margin: 4px 0 2px;
  }

  .player-meta p {
    max-width: 260px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
  }

  .player-actions {
    min-height: 38px;
    border-bottom: 0;
  }

  .player-material {
    min-height: 36px;
    padding-top: 6px;
  }

  .curriculum-panel {
    padding: 12px;
    border-radius: 18px;
  }

  .segmented {
    position: sticky;
    top: 0;
    z-index: 5;
  }

  .admin-main {
    padding: 12px;
  }

  .admin-tabs {
    overflow-x: auto;
  }

  .admin-preview-link {
    margin-left: 0;
  }

  .config-side,
  .admin-form-grid.two,
  .admin-form-grid.three,
  .admin-form-grid.four,
  .option-config-grid,
  .asset-grid {
    grid-template-columns: 1fr;
  }

  .asset-input-row {
    grid-template-columns: 1fr;
  }

  .admin-modal-backdrop {
    padding: 10px;
  }

  .admin-modal {
    max-height: calc(100vh - 20px);
    padding: 14px;
    border-radius: 20px;
  }

  .config-section-head,
  .config-card-head,
  .save-bar {
    display: grid;
  }

  .save-bar .primary-button {
    width: 100%;
  }
}