@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Serif+SC:wght@500;600;700;900&display=swap");

:root {
  --bg: #08080b;
  --bg2: #101014;
  --bg3: #18181d;
  --card: rgba(28, 28, 34, 0.92);
  --card-strong: rgba(35, 35, 42, 0.96);
  --card-soft: rgba(255, 255, 255, 0.045);
  --ink: #fafafa;
  --muted: #a1a1aa;
  --muted-2: #71717a;
  --gold: #e2b64f;
  --gold-2: #f5d98a;
  --gold-soft: rgba(226, 182, 79, 0.13);
  --line: rgba(245, 217, 138, 0.13);
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.35);
  --radius-xl: 30px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  color: var(--ink);
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 18% 8%, rgba(226, 182, 79, 0.14), transparent 28%),
    radial-gradient(circle at 82% 16%, rgba(94, 78, 44, 0.24), transparent 22%),
    linear-gradient(180deg, #050506 0%, var(--bg) 42%, #0d0d10 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.72), transparent 75%);
}

body[data-lang="zh"] .copy-en,
body[data-lang="en"] .copy-zh {
  display: none !important;
}

body[data-lang="dual"] .copy-zh,
body[data-lang="dual"] .copy-en,
body[data-lang="zh"] .copy-zh,
body[data-lang="en"] .copy-en {
  display: block;
}

a {
  color: var(--gold-2);
}

nav {
  position: sticky;
  top: 0;
  z-index: 30;
  min-height: 64px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 10px 16px;
  background: rgba(8, 8, 11, 0.88);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

nav a,
.back-link,
.curriculum-link,
.spotlight-actions a,
.course-nav > a,
.course-nav > span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, color 180ms ease;
}

nav a:hover,
nav a.active,
.back-link:hover,
.curriculum-link:hover,
.course-nav a:hover {
  transform: translateY(-1px);
  color: #16130a;
  background: linear-gradient(135deg, var(--gold-2), var(--gold));
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.045);
}

.lang-pill {
  min-height: 30px;
  padding: 0 10px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
}

.lang-pill.active {
  background: var(--gold-soft);
  color: var(--gold-2);
}

.c,
.container {
  position: relative;
  z-index: 1;
  width: min(1160px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 42px 0 64px;
}

body.lesson-page .container {
  width: min(860px, calc(100vw - 32px));
}

body.thinker-page .container {
  width: min(1040px, calc(100vw - 32px));
}

.hero,
.header,
.course-header {
  position: relative;
  overflow: hidden;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at 70% 18%, rgba(245, 217, 138, 0.13), transparent 30%),
    linear-gradient(145deg, rgba(24, 24, 29, 0.98), rgba(12, 12, 15, 0.96));
  box-shadow: var(--shadow);
}

.hero {
  min-height: 520px;
  display: grid;
  place-items: center;
  padding: 76px 34px 58px;
}

.header,
.course-header {
  padding: 44px 30px;
  margin-bottom: 22px;
}

.hero::after,
.header::after,
.course-header::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(115deg, transparent 0 38%, rgba(226, 182, 79, 0.06) 39% 41%, transparent 42%),
    radial-gradient(circle at 50% 110%, rgba(226, 182, 79, 0.16), transparent 36%);
}

.hero > *,
.header > *,
.course-header > * {
  position: relative;
  z-index: 1;
}

.hero h1,
.header h1,
.course-header h1,
.section-head h3,
.quick-title,
h2 {
  font-family: "Noto Serif SC", serif;
}

.hero h1 {
  max-width: 920px;
  color: var(--ink);
  font-size: clamp(3.1rem, 8vw, 6.2rem);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.06em;
}

.header h1,
.course-header h1 {
  color: var(--ink);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.04em;
}

.hero p,
.subtitle,
.section p,
.section-head p,
.audio-player small {
  color: var(--muted);
  line-height: 1.85;
}

.hero p {
  max-width: 760px;
  margin: 18px auto 0;
  font-size: 1.05rem;
}

.hero .stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  width: min(720px, 100%);
  margin: 34px auto 0;
}

.hero .stat,
.curriculum-stat {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.045);
}

.hero .sn,
.curriculum-stat strong {
  color: var(--gold-2);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
}

.hero .sl,
.curriculum-stat span {
  display: block;
  margin-top: 7px;
  color: var(--muted-2);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h2 {
  position: relative;
  margin: 36px 0 14px;
  padding-left: 18px;
  color: var(--ink);
  font-size: 1.38rem;
  letter-spacing: -0.02em;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 4px;
  border-radius: 999px;
  background: var(--gold);
}

.academy-toolbar {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(260px, 0.72fr);
  gap: 14px;
  margin: 18px 0;
}

.course-search,
.voice-mode {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: var(--shadow);
}

.course-search label,
.voice-mode strong {
  display: block;
  margin-bottom: 10px;
  color: var(--gold-2);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.course-search input {
  width: 100%;
  min-height: 48px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  outline: none;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.06);
  font: inherit;
}

.course-search input:focus {
  border-color: rgba(245, 217, 138, 0.52);
  box-shadow: 0 0 0 4px rgba(226, 182, 79, 0.1);
}

.voice-mode p {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.75;
}

.spark-system,
.reference-shelf,
.section,
.audio-player,
.course-nav,
.learning-card,
.kpi-card,
.spark-card,
.capsule,
.source-card,
.case-card,
.module-card,
.blueprint-card,
.domain-card,
.tc,
.ci-card {
  border: 1px solid var(--line);
  background: var(--card);
  box-shadow: var(--shadow);
}

.spark-system,
.reference-shelf {
  margin: 22px 0;
  padding: 24px;
  border-radius: var(--radius-lg);
}

.reference-shelf {
  background:
    radial-gradient(circle at 82% 15%, rgba(226, 182, 79, 0.12), transparent 28%),
    linear-gradient(145deg, rgba(28, 28, 34, 0.96), rgba(11, 11, 14, 0.96));
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: 20px;
  align-items: start;
  margin-bottom: 18px;
}

.section-head h3 {
  margin-top: 10px;
  color: var(--ink);
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  font-weight: 800;
  line-height: 1.15;
}

.eyebrow,
.badge,
.tt,
.tag,
.reference-kind,
.blueprint-num,
.domain-count {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 28px;
  padding: 0 10px;
  border: 1px solid rgba(226, 182, 79, 0.16);
  border-radius: 999px;
  background: var(--gold-soft);
  color: var(--gold-2);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.blueprint-grid,
.domain-grid,
.learning-grid,
.lesson-kpis,
.spark-grid,
.capsule-grid,
.module-ladder,
.source-grid,
.case-grid,
.detail-dual-grid,
.reference-grid {
  display: grid;
  gap: 14px;
}

.blueprint-grid {
  grid-template-columns: repeat(auto-fit, minmax(176px, 1fr));
  margin-bottom: 14px;
}

.domain-grid,
.learning-grid,
.lesson-kpis,
.spark-grid,
.capsule-grid,
.source-grid,
.case-grid,
.detail-dual-grid,
.reference-grid,
.module-ladder {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.blueprint-card,
.domain-card,
.learning-card,
.kpi-card,
.spark-card,
.capsule,
.source-card,
.case-card,
.module-card,
.reference-card {
  min-height: 100%;
  padding: 18px;
  border-radius: var(--radius-md);
}

.domain-card {
  border-top: 4px solid var(--domain-accent, var(--gold));
}

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

.domain-top span,
.course-note,
.mini-note,
.blueprint-card small,
.domain-card small,
.module-card small,
.case-card small,
.source-card small,
.reference-meta {
  display: block;
  margin-top: 9px;
  color: var(--muted-2);
  font-size: 0.8rem;
  line-height: 1.6;
}

.blueprint-card strong,
.domain-card strong,
.learning-card strong,
.kpi-card strong,
.spark-card strong,
.capsule strong,
.module-card strong,
.source-card strong,
.case-card strong,
.reference-card strong,
.ci-title,
.tc b {
  display: block;
  color: var(--ink);
  line-height: 1.4;
}

.blueprint-card p,
.domain-card p,
.learning-card p,
.kpi-card p,
.spark-card p,
.capsule p,
.module-card p,
.source-card p,
.case-card p,
.reference-card p {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.72;
}

.copy-en:not(strong):not(b):not(h1):not(h2):not(h3) {
  color: #8f8f98;
  font-size: 0.9rem;
}

.phase-section {
  margin: 26px 0 34px;
}

.phase-header {
  position: sticky;
  top: 64px;
  z-index: 12;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  margin-bottom: 10px;
  padding: 12px 0;
  background: linear-gradient(180deg, rgba(8, 8, 11, 0.96), rgba(8, 8, 11, 0.82));
  backdrop-filter: blur(12px);
}

.phase-header h2 {
  margin: 0;
}

.phase-header p {
  color: var(--muted-2);
  font-size: 0.86rem;
}

.thinker-grid,
.course-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.tc,
.ci-card {
  position: relative;
  overflow: hidden;
  text-decoration: none;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.tc {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  min-height: 92px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  color: var(--ink);
}

.tc::before {
  content: "智";
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  border-radius: 15px;
  color: #17130a;
  background: linear-gradient(135deg, var(--gold-2), var(--gold));
  font-family: "Noto Serif SC", serif;
  font-weight: 900;
}

.tc:hover,
.ci-card:hover,
.featured-card:hover {
  transform: translateY(-2px);
  border-color: rgba(245, 217, 138, 0.34);
  background: var(--card-strong);
}

.tc small,
.ci-sub,
.subtitle {
  font-size: 0.88rem;
  line-height: 1.6;
}

.ci-audio {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 28px;
  margin-top: 10px;
  padding: 0 10px;
  border: 1px solid rgba(226, 182, 79, 0.16);
  border-radius: 999px;
  background: var(--gold-soft);
  color: var(--gold-2);
  font-size: 0.76rem;
  font-weight: 700;
}

.ci-audio .copy-zh,
.ci-audio .copy-en,
.lesson-meta .copy-zh,
.lesson-meta .copy-en,
.audio-label .copy-zh,
.audio-label .copy-en,
.course-search label .copy-zh,
.course-search label .copy-en,
.voice-mode strong .copy-zh,
.voice-mode strong .copy-en {
  display: inline;
}

body[data-lang="dual"] .ci-audio .copy-zh::after,
body[data-lang="dual"] .lesson-meta .copy-zh::after,
body[data-lang="dual"] .audio-label .copy-zh::after {
  content: " / ";
  color: var(--muted-2);
}

.ci-card {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  color: inherit;
}

.ci-num {
  display: grid;
  place-items: center;
  width: 68px;
  height: 68px;
  border-radius: 16px;
  color: #17130a;
  background: linear-gradient(135deg, var(--gold-2), var(--gold));
  font-weight: 800;
  font-size: 0.88rem;
}

.back-link {
  margin-bottom: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.045);
}

.signature {
  max-width: 680px;
  margin: 20px auto 0;
  padding: 18px 20px;
  border-left: 4px solid var(--gold);
  border-radius: var(--radius-sm);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.045);
  text-align: left;
  font-family: "Noto Serif SC", serif;
  font-style: italic;
  line-height: 1.8;
}

.header .tags,
.header-tags {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.lesson-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 50;
  width: 100%;
  height: 3px;
  background: rgba(255, 255, 255, 0.08);
}

.lesson-progress span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--gold), var(--gold-2));
  box-shadow: 0 0 18px rgba(245, 217, 138, 0.55);
}

.lesson-meta {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 9px;
  margin: 18px 0 0;
}

.lesson-meta span {
  min-height: 30px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.04);
  font-size: 0.78rem;
}

.audio-player {
  display: grid;
  gap: 14px;
  margin: 0 0 24px;
  padding: 20px;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 88% 12%, rgba(226, 182, 79, 0.14), transparent 26%),
    var(--card-strong);
}

.audio-head {
  display: flex;
  align-items: center;
  gap: 14px;
}

.audio-icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 15px;
  color: #17130a;
  background: linear-gradient(135deg, var(--gold-2), var(--gold));
  font-size: 1.2rem;
}

.audio-label {
  display: block;
  color: var(--gold-2);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.audio-player audio {
  width: 100%;
  height: 44px;
  filter: sepia(18%) saturate(130%) hue-rotate(345deg);
}

.section {
  margin-bottom: 18px;
  padding: 24px;
  border-radius: var(--radius-lg);
}

.section h2 {
  margin-top: 0;
}

.section p {
  margin-top: 10px;
  font-size: 1rem;
  white-space: pre-line;
}

.bullet-list,
.action-list {
  display: grid;
  gap: 10px;
  padding-left: 1.25rem;
}

.bullet-list li,
.action-list li {
  color: var(--muted);
  line-height: 1.82;
}

.memory-line {
  background:
    radial-gradient(circle at 90% 20%, rgba(226, 182, 79, 0.14), transparent 30%),
    var(--card-strong);
}

.memory-line p {
  color: var(--ink);
  font-family: "Noto Serif SC", serif;
  font-size: 1.08rem;
}

.reference-group + .reference-group {
  margin-top: 18px;
}

.reference-group h4 {
  margin: 0 0 12px;
  color: var(--gold-2);
  font-size: 0.96rem;
  letter-spacing: 0.06em;
}

.reference-card {
  border: 1px solid rgba(245, 217, 138, 0.12);
  background: rgba(255, 255, 255, 0.052);
}

.course-nav {
  display: grid;
  gap: 14px;
  padding: 18px;
  margin-top: 28px;
  border-radius: var(--radius-lg);
}

.course-nav > a,
.course-nav > span {
  width: fit-content;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.045);
}

.course-nav .disabled {
  opacity: 0.52;
}

.course-index {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(108px, 1fr));
  gap: 8px;
}

.course-index a {
  display: grid;
  place-items: center;
  min-height: 42px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.04);
  text-decoration: none;
  font-size: 0.82rem;
}

.course-index a.current {
  color: #17130a;
  border-color: transparent;
  background: linear-gradient(135deg, var(--gold-2), var(--gold));
}

@media (max-width: 960px) {
  .hero .stats,
  .academy-toolbar,
  .section-head {
    grid-template-columns: 1fr;
  }

  .phase-header {
    top: 58px;
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 680px) {
  nav {
    justify-content: flex-start;
    overflow-x: auto;
  }

  .c,
  .container {
    width: calc(100vw - 24px);
    padding-top: 28px;
  }

  .hero {
    min-height: auto;
    padding: 46px 20px;
  }

  .hero h1 {
    font-size: 2.35rem;
  }

  .header,
  .course-header,
  .spark-system,
  .reference-shelf,
  .section,
  .audio-player {
    padding: 20px;
  }

  .tc,
  .ci-card {
    grid-template-columns: 1fr;
  }

  .tc::before,
  .ci-num {
    width: 54px;
    height: 54px;
  }
}