/* =====================================================
   AI 素养教育 · 对外官网 · 设计系统
   单一字体（PingFang SC）· 单色品牌（蓝） · 线性图标 · 无装饰
   ===================================================== */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; cursor: pointer; background: none; border: 0; color: inherit; }
a { color: inherit; text-decoration: none; }

/* ---------- Design tokens ---------- */
:root {
  /* Brand · 3 个蓝色（来自 PPT） */
  --blue:        #2563EB;
  --blue-dark:   #0F3D91;
  --blue-light:  #5B8CFF;
  --blue-50:     #EFF5FF;
  --blue-100:    #DBE8FF;

  /* Neutrals */
  --white:       #FFFFFF;
  --gray-50:     #F8FAFC;
  --gray-100:    #F1F5F9;
  --gray-200:    #E5E7EB;
  --gray-300:    #CBD5E1;
  --gray-400:    #94A3B8;
  --gray-500:    #64748B;
  --gray-600:    #475569;
  --gray-700:    #334155;
  --gray-800:    #1F2937;
  --gray-900:    #0F172A;

  /* Aliases */
  --bg:          var(--white);
  --bg-alt:      var(--gray-50);
  --border:      var(--gray-200);
  --border-strong:var(--gray-300);
  --text:        var(--gray-900);
  --text-2:      var(--gray-700);
  --text-3:      var(--gray-500);
  --text-mute:   var(--gray-400);

  /* Type */
  --font: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Spacing scale */
  --sp-1: 4px;  --sp-2: 8px;  --sp-3: 12px; --sp-4: 16px;
  --sp-5: 20px; --sp-6: 24px; --sp-7: 32px; --sp-8: 48px;
  --sp-9: 64px; --sp-10: 96px; --sp-11: 128px;

  /* Radius */
  --r-sm: 6px; --r-md: 8px; --r-lg: 12px;

  /* Shadow */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.08);

  /* Layout */
  --container: 1200px;
  --pad-x: clamp(20px, 4vw, 48px);
}

/* ---------- Base ---------- */
body {
  font-family: var(--font);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'palt' 1;
}

::selection { background: var(--blue); color: #fff; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font);
  color: var(--text);
  letter-spacing: -0.01em;
  font-weight: 600;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease;
}
.site-header.is-scrolled { border-bottom-color: var(--border); }

.site-header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px var(--pad-x);
  display: flex;
  align-items: center;
  gap: 32px;
  height: 64px;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 16px;
  color: var(--text);
  flex-shrink: 0;
}
.site-logo svg { width: 22px; height: 22px; color: var(--blue); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.site-nav a {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-2);
  border-radius: var(--r-sm);
  transition: color .15s ease, background .15s ease;
}
.site-nav a:hover { color: var(--text); }
.site-nav a.active { color: var(--blue); }

.site-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--white);
  background: var(--blue);
  border-radius: var(--r-md);
  transition: background .15s ease;
}
.site-cta:hover { background: var(--blue-dark); }
.site-cta svg { width: 16px; height: 16px; }

.site-nav-toggle { display: none; }

@media (max-width: 920px) {
  .site-nav { display: none; }
  .site-header-inner { gap: 16px; }
  .site-nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-left: auto;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    font-size: 13px;
    color: var(--text-2);
  }
  .site-nav-toggle svg { width: 16px; height: 16px; }
  .site-nav.is-open {
    display: flex;
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px var(--pad-x) 16px;
    background: var(--white);
    border-bottom: 1px solid var(--border);
  }
  .site-nav.is-open a {
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
  }
  .site-nav.is-open a:last-child { border-bottom: 0; }
}

/* ---------- Layout primitives ---------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}

section {
  padding: clamp(64px, 9vw, 112px) 0;
}
section.alt { background: var(--bg-alt); }
section.tight { padding: clamp(48px, 7vw, 80px) 0; }

/* ---------- Eyebrow + section heading ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--blue);
}
.eyebrow svg { width: 16px; height: 16px; }

.section-head {
  max-width: 760px;
  margin-bottom: clamp(40px, 5vw, 64px);
}
.section-head.centered {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}
.section-head h2 {
  margin-top: 16px;
  font-size: clamp(28px, 3.6vw, 42px);
  font-weight: 600;
  line-height: 1.25;
  color: var(--text);
}
.section-head .lead {
  margin-top: 16px;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-3);
  max-width: 640px;
}
.section-head.centered .lead { margin-left: auto; margin-right: auto; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--r-md);
  transition: background .15s ease, color .15s ease, border-color .15s ease;
  white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: var(--blue); color: var(--white); }
.btn-primary:hover { background: var(--blue-dark); }
.btn-ghost {
  background: var(--white);
  color: var(--text);
  border: 1px solid var(--border-strong);
}
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); }
.btn-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--blue);
  font-weight: 500;
  font-size: 15px;
}
.btn-link svg { width: 16px; height: 16px; transition: transform .15s ease; }
.btn-link:hover svg { transform: translateX(3px); }

/* ---------- Card ---------- */
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: clamp(24px, 3vw, 32px);
  transition: border-color .2s ease, box-shadow .2s ease;
}
a.card { display: block; color: inherit; }
.card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

/* Icon-prefixed card */
.card .card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--r-md);
  background: var(--blue-50);
  color: var(--blue);
  margin-bottom: 16px;
}
.card .card-icon svg { width: 22px; height: 22px; }
.card h3, .card .card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  margin: 0;
}
.card .card-desc {
  margin-top: 10px;
  font-size: 14.5px;
  color: var(--text-3);
  line-height: 1.75;
}
.card .card-foot {
  margin-top: 18px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--blue);
}
.card .card-foot svg { width: 16px; height: 16px; transition: transform .15s ease; }
a.card:hover .card-foot svg { transform: translateX(3px); }

/* ---------- Hero ---------- */
.hero {
  padding: clamp(72px, 12vw, 128px) 0 clamp(56px, 8vw, 96px);
}
.hero h1 {
  font-size: clamp(36px, 5.6vw, 64px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.022em;
  color: var(--text);
  max-width: 900px;
}
.hero .blue-accent {
  color: var(--blue);
}
.hero .lead {
  margin-top: 24px;
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.75;
  color: var(--text-3);
  max-width: 680px;
}
.hero-actions {
  margin-top: 36px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-stats {
  margin-top: clamp(48px, 6vw, 72px);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 32px);
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.hero-stat .n {
  font-size: clamp(32px, 3.6vw, 44px);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.1;
}
.hero-stat .n .suffix {
  font-size: 0.55em;
  color: var(--text-3);
  font-weight: 500;
  margin-left: 2px;
}
.hero-stat .l {
  margin-top: 6px;
  font-size: 14px;
  color: var(--text-3);
}

@media (max-width: 720px) {
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 24px 16px; }
}

/* ---------- Page hero (subpages) ---------- */
.page-hero {
  padding: clamp(72px, 9vw, 112px) 0 clamp(48px, 6vw, 72px);
  border-bottom: 1px solid var(--border);
}
.page-hero h1 {
  margin-top: 16px;
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: -0.018em;
  color: var(--text);
  max-width: 900px;
}
.page-hero .lead {
  margin-top: 20px;
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.75;
  color: var(--text-3);
  max-width: 720px;
}

/* ---------- Grid helpers ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(16px, 2vw, 24px); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(16px, 2vw, 24px); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(14px, 1.8vw, 20px); }

@media (max-width: 960px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ---------- Capability list (preview) ---------- */
.cap-card { /* Just uses .card base */ }
.cap-card .cap-num {
  font-size: 13px;
  font-weight: 500;
  color: var(--blue);
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}
.cap-card .cap-subs {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.cap-card .cap-subs span {
  font-size: 13px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--gray-50);
  color: var(--text-2);
  border: 1px solid var(--border);
}

/* ---------- Training paradigm (S2 on homepage) ---------- */
.train-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(12px, 1.8vw, 20px);
  margin-bottom: 32px;
}
.train-stage {
  padding: 28px 24px 24px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
}
.train-stage .ts-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--r-md);
  background: var(--blue-50);
  color: var(--blue);
  margin-bottom: 18px;
}
.train-stage .ts-icon svg { width: 22px; height: 22px; }
.train-stage .ts-step {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-mute);
  letter-spacing: 0.04em;
}
.train-stage .ts-name {
  margin-top: 4px;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}
.train-stage .ts-body {
  margin-top: 12px;
  font-size: 14px;
  color: var(--text-3);
  line-height: 1.75;
}
.train-stage .ts-meta {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  font-size: 12.5px;
  color: var(--text-mute);
  line-height: 1.65;
}
.train-note {
  padding: 28px 32px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
}
.train-note p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-2);
}
.train-note p + p { margin-top: 12px; }
.train-note strong { color: var(--text); font-weight: 600; }

@media (max-width: 760px) { .train-flow { grid-template-columns: 1fr; } }

/* ---------- Track list ---------- */
.track-card .card-icon {
  background: var(--blue-50);
  color: var(--blue);
}
.track-card .track-tag {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-mute);
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}
.track-card h3 {
  font-size: 19px;
  font-weight: 600;
  color: var(--text);
}
.track-card .track-en {
  margin-top: 4px;
  font-size: 13px;
  color: var(--text-mute);
}
.track-card .track-pitch {
  margin-top: 14px;
  font-size: 14.5px;
  color: var(--text-3);
  line-height: 1.75;
}

/* ---------- Pedagogy preview ---------- */
.peda-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(32px, 4vw, 56px);
  align-items: center;
}
@media (max-width: 880px) { .peda-grid { grid-template-columns: 1fr; } }

.peda-cycle {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 480px;
  margin: 0 auto;
}
.peda-cycle svg { width: 100%; height: 100%; overflow: visible; }

.peda-step-list { display: grid; gap: 16px; }
.peda-step {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 14px;
  align-items: start;
}
.peda-step .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--blue-50);
  color: var(--blue);
  font-size: 13px;
  font-weight: 600;
  flex-shrink: 0;
}
.peda-step .step-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}
.peda-step .step-desc {
  margin-top: 4px;
  font-size: 14px;
  color: var(--text-3);
  line-height: 1.7;
}

.chip-row {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--gray-50);
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-2);
}
.chip svg { width: 14px; height: 14px; color: var(--blue); }

/* ---------- Partnership modes ---------- */
.mode-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(14px, 1.6vw, 20px);
}
@media (max-width: 980px) { .mode-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .mode-grid { grid-template-columns: 1fr; } }

.mode-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 24px 22px;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.mode-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}
.mode-card .mode-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--r-md);
  background: var(--blue-50);
  color: var(--blue);
  margin-bottom: 16px;
}
.mode-card .mode-icon svg { width: 20px; height: 20px; }
.mode-card .mode-num {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-mute);
  letter-spacing: 0.04em;
}
.mode-card h4 {
  margin-top: 4px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}
.mode-card .mode-pitch {
  margin-top: 12px;
  font-size: 13.5px;
  color: var(--text-3);
  line-height: 1.75;
}

/* ---------- Benefit grid ---------- */
.benefit-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(14px, 1.8vw, 20px);
}
@media (max-width: 980px) { .benefit-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .benefit-grid { grid-template-columns: 1fr; } }

.benefit-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 28px 24px;
}
.benefit-card .benefit-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--r-md);
  background: var(--blue-50);
  color: var(--blue);
  margin-bottom: 16px;
}
.benefit-card .benefit-icon svg { width: 22px; height: 22px; }
.benefit-card h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}
.benefit-card ul {
  margin-top: 16px;
  list-style: none;
  display: grid;
  gap: 10px;
}
.benefit-card li {
  position: relative;
  padding-left: 20px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-2);
}
.benefit-card li::before {
  content: '';
  position: absolute;
  left: 0; top: 9px;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--blue-light);
}

/* ---------- CTA strip ---------- */
.cta-strip {
  margin-top: clamp(64px, 8vw, 96px);
  padding: clamp(40px, 5vw, 56px);
  background: var(--blue-dark);
  color: var(--white);
  border-radius: var(--r-lg);
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) auto;
  gap: 32px;
  align-items: center;
}
.cta-strip .eyebrow { color: var(--blue-light); }
.cta-strip h3 {
  margin-top: 12px;
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 600;
  line-height: 1.3;
  color: var(--white);
}
.cta-strip p {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.78);
  max-width: 560px;
}
.cta-strip .cta-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.cta-strip .btn-primary {
  background: var(--white);
  color: var(--blue-dark);
}
.cta-strip .btn-primary:hover { background: var(--blue-50); }
.cta-strip .btn-ghost {
  background: transparent;
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.25);
}
.cta-strip .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--white);
  color: var(--white);
}

@media (max-width: 760px) {
  .cta-strip { grid-template-columns: 1fr; }
  .cta-strip .cta-actions { justify-content: flex-start; }
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--white);
  padding: clamp(48px, 6vw, 72px) 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) repeat(2, minmax(0, 1fr));
  gap: 48px;
  margin-bottom: 40px;
}
@media (max-width: 760px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
.footer-grid h5 {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--text-mute);
  font-weight: 600;
  margin-bottom: 14px;
}
.footer-grid ul { list-style: none; display: grid; gap: 10px; }
.footer-grid li a { color: var(--text-2); font-size: 14px; }
.footer-grid li a:hover { color: var(--blue); }
.footer-blurb {
  font-size: 14px;
  color: var(--text-3);
  line-height: 1.8;
  max-width: 360px;
}
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-mute);
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Course catalog ---------- */
.form-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(14px, 2vw, 22px);
}
@media (max-width: 860px) { .form-row { grid-template-columns: 1fr; } }

.form-card {
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
}
.form-card .form-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--r-md);
  background: var(--blue-50);
  color: var(--blue);
  margin-bottom: 18px;
}
.form-card .form-icon svg { width: 22px; height: 22px; }
.form-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
}
.form-card .form-time {
  margin-top: 6px;
  font-size: 13px;
  color: var(--text-mute);
  letter-spacing: 0.04em;
}
.form-card .form-body {
  margin-top: 16px;
  font-size: 14.5px;
  color: var(--text-3);
  line-height: 1.8;
}

/* Track detail (full) */
.track-detail {
  padding: clamp(28px, 4vw, 40px);
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  margin-top: clamp(16px, 2.4vw, 24px);
}
.track-detail .td-head {
  display: flex; gap: 16px; align-items: flex-start; flex-wrap: wrap;
}
.track-detail .td-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px; height: 48px;
  border-radius: var(--r-md);
  background: var(--blue-50);
  color: var(--blue);
  flex-shrink: 0;
}
.track-detail .td-icon svg { width: 24px; height: 24px; }
.track-detail .td-tag {
  font-size: 12px;
  color: var(--text-mute);
  letter-spacing: 0.04em;
  font-weight: 500;
}
.track-detail h3 {
  margin-top: 2px;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 600;
  color: var(--text);
}
.track-detail .td-pitch {
  margin-top: 16px;
  font-size: 15.5px;
  color: var(--text-2);
  line-height: 1.85;
  max-width: 820px;
}
.track-detail .td-essence {
  margin-top: 16px;
  padding: 16px 20px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.8;
}
.track-detail .td-essence strong {
  color: var(--text);
  margin-right: 6px;
}
.track-detail .td-courses {
  margin-top: 18px;
  display: flex; flex-wrap: wrap; gap: 8px;
}
.td-pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px;
  color: var(--text-2);
}
.td-pill .td-pill-form {
  font-size: 12px;
  color: var(--text-mute);
}

.tag-pill {
  margin-left: auto;
  padding: 4px 10px;
  background: var(--blue-50);
  color: var(--blue);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
}

/* Track group (categorized course catalog) */
.track-group + .track-group { margin-top: clamp(40px, 5vw, 56px); }
.track-group-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.track-group-head .tg-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--r-md);
  background: var(--blue-50);
  color: var(--blue);
  flex-shrink: 0;
}
.track-group-head .tg-icon svg { width: 22px; height: 22px; }
.track-group-head h3 {
  font-size: 19px;
  font-weight: 600;
  color: var(--text);
}
.track-group-head .tg-en {
  font-size: 13px;
  color: var(--text-mute);
  font-weight: 500;
  margin-left: 4px;
}
.track-group-head .tg-count {
  margin-left: auto;
  padding: 4px 10px;
  background: var(--blue-50);
  color: var(--blue);
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 500;
}

/* Spec card (course catalog grid) */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: clamp(14px, 2vw, 20px);
}
.spec-card {
  display: block;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 24px;
  transition: border-color .2s ease, box-shadow .2s ease;
  color: inherit;
}
.spec-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}
.spec-card .sp-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--blue);
  margin-bottom: 12px;
}
.spec-card .sp-tag .sp-dot {
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--text-mute);
}
.spec-card .sp-tag .sp-form {
  color: var(--text-mute);
  font-weight: 500;
}
.spec-card h4 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}
.spec-card .sp-sub {
  margin-top: 8px;
  font-size: 13.5px;
  color: var(--text-3);
  line-height: 1.7;
  min-height: 2.6em;
}
.spec-card .sp-foot {
  margin-top: 18px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--blue);
}
.spec-card .sp-foot svg { width: 16px; height: 16px; transition: transform .15s ease; }
.spec-card:hover .sp-foot svg { transform: translateX(3px); }

/* ---------- Pedagogy page ---------- */
.peda-three {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 2vw, 24px);
}
@media (max-width: 880px) { .peda-three { grid-template-columns: 1fr; } }

.step-detail {
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
}
.step-detail .sd-head {
  display: flex; align-items: center; gap: 14px;
}
.step-detail .sd-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--blue-50);
  color: var(--blue);
  font-size: 14px;
  font-weight: 600;
}
.step-detail .sd-name {
  font-size: 19px;
  font-weight: 600;
  color: var(--text);
}
.step-detail .sd-tag {
  margin-left: auto;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--gray-100);
  color: var(--text-2);
  font-size: 12px;
  font-weight: 500;
}
.step-detail .sd-pitch {
  margin-top: 14px;
  font-size: 14.5px;
  color: var(--text-2);
  line-height: 1.7;
}
.step-detail dl {
  margin-top: 18px;
  display: grid;
  gap: 10px;
}
.step-detail dl > div {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 14px;
  font-size: 13.5px;
  line-height: 1.7;
}
.step-detail dt {
  color: var(--text-mute);
  font-weight: 500;
  font-size: 12.5px;
  letter-spacing: 0.04em;
}
.step-detail dd { color: var(--text-2); }
.step-detail dd .quote { color: var(--blue); }

.dont-card {
  padding: 26px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
}
.dont-card .d-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: var(--r-md);
  background: var(--gray-100);
  color: var(--gray-500);
  margin-bottom: 14px;
}
.dont-card .d-icon svg { width: 18px; height: 18px; }
.dont-card .d-num {
  font-size: 12px;
  color: var(--text-mute);
  letter-spacing: 0.04em;
}
.dont-card h4 {
  margin-top: 4px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
}
.dont-card p {
  margin-top: 10px;
  font-size: 13.5px;
  color: var(--text-3);
  line-height: 1.75;
}
.dont-card .d-instead {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--blue);
  line-height: 1.7;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.dont-card .d-instead svg {
  width: 16px; height: 16px;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ---------- Capability page ---------- */
.cap-arch {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  padding: clamp(32px, 4vw, 48px);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
}
@media (max-width: 760px) { .cap-arch { grid-template-columns: 1fr; } }
.cap-arch .arch-block {
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  gap: 16px;
}
.cap-arch .arch-block .arch-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  border-radius: var(--r-md);
  background: var(--blue-50);
  color: var(--blue);
  flex-shrink: 0;
}
.cap-arch .arch-block .arch-icon svg { width: 22px; height: 22px; }
.cap-arch .arch-block .slogan {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
}
.cap-arch .arch-block .label {
  margin-top: 2px;
  font-size: 13.5px;
  color: var(--text-3);
}

.cap-block-large {
  margin-top: clamp(40px, 5vw, 64px);
  padding: clamp(28px, 4vw, 40px);
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
}
.cap-block-large .h-row {
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
}
.cap-block-large .cap-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px; height: 48px;
  border-radius: var(--r-md);
  background: var(--blue-50);
  color: var(--blue);
}
.cap-block-large .cap-icon svg { width: 24px; height: 24px; }
.cap-block-large .num {
  font-size: 13px;
  color: var(--text-mute);
  letter-spacing: 0.04em;
  font-weight: 500;
}
.cap-block-large h3 {
  margin-top: 2px;
  font-size: clamp(22px, 2.6vw, 28px);
  font-weight: 600;
  color: var(--text);
}
.cap-block-large .body {
  margin-top: 18px;
  font-size: 15.5px;
  color: var(--text-2);
  line-height: 1.85;
  max-width: 880px;
}

.subcap-grid {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}
.subcap {
  padding: 20px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
}
.subcap .sc-num {
  font-size: 12px;
  color: var(--text-mute);
  letter-spacing: 0.04em;
  font-weight: 500;
}
.subcap h4 {
  margin-top: 4px;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--text);
}
.subcap p {
  margin-top: 8px;
  font-size: 13.5px;
  color: var(--text-3);
  line-height: 1.75;
}

/* ---------- Policy grid (partnerships) ---------- */
.policy-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(16px, 2vw, 24px);
}
@media (max-width: 760px) { .policy-grid { grid-template-columns: 1fr; } }

.policy-card {
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
}
.policy-card .p-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: var(--r-md);
  background: var(--blue-50);
  color: var(--blue);
  margin-bottom: 14px;
}
.policy-card .p-icon svg { width: 22px; height: 22px; }
.policy-card .p-eyebrow {
  font-size: 12px;
  color: var(--text-mute);
  letter-spacing: 0.04em;
  font-weight: 500;
}
.policy-card h3 {
  margin-top: 4px;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}
.policy-card .p-body {
  margin-top: 14px;
  font-size: 14.5px;
  color: var(--text-2);
  line-height: 1.85;
}
.policy-card ul {
  margin-top: 14px;
  list-style: none;
  display: grid;
  gap: 8px;
}
.policy-card li {
  position: relative;
  padding-left: 20px;
  font-size: 13.5px;
  color: var(--text-2);
  line-height: 1.7;
}
.policy-card li::before {
  content: '';
  position: absolute;
  left: 0; top: 9px;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--blue-light);
}

/* ---------- Mode detail (full) ---------- */
.mode-detail {
  display: grid;
  gap: clamp(16px, 2vw, 24px);
}
.mode-block {
  padding: clamp(28px, 4vw, 40px);
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}
@media (max-width: 720px) {
  .mode-block { grid-template-columns: 1fr; gap: 16px; }
}
.mode-block .mb-icon {
  width: 56px; height: 56px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-md);
  background: var(--blue-50);
  color: var(--blue);
}
.mode-block .mb-icon svg { width: 28px; height: 28px; }
.mode-block .mb-num {
  font-size: 13px;
  color: var(--text-mute);
  letter-spacing: 0.04em;
  font-weight: 500;
}
.mode-block h3 {
  margin-top: 2px;
  font-size: clamp(20px, 2.4vw, 24px);
  font-weight: 600;
  color: var(--text);
}
.mode-block .mb-pitch {
  margin-top: 14px;
  font-size: 15px;
  color: var(--text-2);
  line-height: 1.85;
}
.mode-block ul {
  margin-top: 16px;
  list-style: none;
  display: grid;
  gap: 8px;
}
.mode-block li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.75;
}
.mode-block li::before {
  content: '';
  position: absolute;
  left: 0; top: 10px;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--blue-light);
}

/* ---------- Utility ---------- */
.text-blue { color: var(--blue); }
.text-mute { color: var(--text-3); }
.text-strong { color: var(--text); }
.hairline {
  height: 1px;
  background: var(--border);
  border: 0;
  margin: clamp(40px, 5vw, 64px) 0;
}

/* ---------- Collapsible disclosure (details/summary) ---------- */
.disclosure {
  margin-top: 16px;
}
.disclosure > summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-2);
  cursor: pointer;
  user-select: none;
  list-style: none;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
}
.disclosure > summary::-webkit-details-marker { display: none; }
.disclosure > summary::marker { display: none; content: ''; }
.disclosure > summary:hover {
  background: var(--blue-50);
  border-color: var(--blue-100);
  color: var(--blue);
}
.disclosure > summary .chev {
  display: inline-block;
  width: 14px; height: 14px;
  flex-shrink: 0;
  transition: transform .2s ease;
}
.disclosure[open] > summary .chev { transform: rotate(180deg); }
.disclosure[open] > summary {
  background: var(--blue);
  border-color: var(--blue);
  color: var(--white);
}
.disclosure[open] > summary:hover { background: var(--blue-dark); }
.disclosure > .disclosure-body {
  margin-top: 16px;
}

/* ---------- Star ladder (5 levels) ---------- */
/* Used to show progressive behavior descriptions per sub-capability or track level. */
.star-ladder {
  list-style: none;
  display: grid;
  gap: 8px;
}
.star-ladder > li {
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: 14px;
  align-items: start;
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.7;
}
.stars {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 0;
  line-height: 1;
}
.stars i {
  display: inline-block;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--gray-200);
  flex-shrink: 0;
}
.stars i.on { background: var(--blue); }

/* Track levels ladder */
.level-grid {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}
.level-card {
  padding: 20px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.level-card .lv-pip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 4px;
}
.level-card .lv-pip i {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--blue);
}
.level-card .lv-tag {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-mute);
  letter-spacing: 0.04em;
}
.level-card h5 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}
.level-card .lv-pitch {
  font-size: 13px;
  color: var(--text-3);
  line-height: 1.7;
  flex-grow: 1;
}
.level-card dl {
  margin-top: 6px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
  display: grid;
  gap: 4px;
}
.level-card dl > div {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 8px;
  font-size: 12.5px;
  line-height: 1.65;
}
.level-card dt {
  color: var(--text-mute);
  font-weight: 500;
}
.level-card dd { color: var(--text-2); }

.level-note {
  margin-top: 16px;
  padding: 14px 18px;
  background: var(--blue-50);
  border: 1px solid var(--blue-100);
  border-radius: var(--r-md);
  font-size: 13.5px;
  color: var(--text-2);
  line-height: 1.7;
}
.level-note strong { color: var(--text); }

/* Semester sub-level cards */
.semester-levels {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px dashed var(--border);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
@media (max-width: 720px) { .semester-levels { grid-template-columns: 1fr; } }
.semester-level {
  padding: 16px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
}
.semester-level .sl-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 500;
  color: var(--blue);
  letter-spacing: 0.04em;
}
.semester-level .sl-tag i {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--blue);
}
.semester-level h5 {
  margin-top: 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}
.semester-level p {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-3);
  line-height: 1.7;
}

/* Future roadmap cards */
.future-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(16px, 2vw, 24px);
}
@media (max-width: 760px) { .future-grid { grid-template-columns: 1fr; } }
.future-card {
  padding: 32px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  position: relative;
}
.future-card .future-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--blue-50);
  color: var(--blue);
  font-size: 12px;
  font-weight: 500;
  border-radius: 999px;
  margin-bottom: 16px;
}
.future-card .future-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--r-md);
  background: var(--blue-50);
  color: var(--blue);
  margin-bottom: 18px;
}
.future-card .future-icon svg { width: 24px; height: 24px; }
.future-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
}
.future-card p {
  margin-top: 14px;
  font-size: 14.5px;
  color: var(--text-3);
  line-height: 1.85;
}

/* Principle card (deeper version with Why) */
.principle-card {
  padding: clamp(24px, 3vw, 32px);
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
}
.principle-card .pr-num {
  font-size: 13px;
  color: var(--blue);
  font-weight: 500;
  letter-spacing: 0.04em;
}
.principle-card h3 {
  margin-top: 6px;
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}
.principle-card .pr-main {
  margin-top: 14px;
  font-size: 15px;
  color: var(--text-2);
  line-height: 1.85;
}
.principle-card .pr-why {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed var(--border);
  font-size: 13.5px;
  color: var(--text-3);
  line-height: 1.85;
}
.principle-card .pr-why strong {
  color: var(--text);
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  text-transform: none;
}

/* ---------- Scroll reveal (progressive enhancement) ---------- */
.reveal { opacity: 1; transform: none; }
.js-anim .reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .6s ease, transform .6s ease;
}
.js-anim .reveal.in { opacity: 1; transform: none; }
.js-anim .reveal-delay-1 { transition-delay: .06s; }
.js-anim .reveal-delay-2 { transition-delay: .12s; }
.js-anim .reveal-delay-3 { transition-delay: .18s; }
.js-anim .reveal-delay-4 { transition-delay: .24s; }

@media (prefers-reduced-motion: reduce) {
  .js-anim .reveal, .js-anim .reveal.in { opacity: 1; transform: none; transition: none; }
}