/* ==========================================================================
   StepAudio-2.5-Realtime Demo · 全局样式
   章节目录：
     1. CSS Variables & Reset
     2. Global Typography & Utilities
     3. Navigation
     4. § Hero
     5. § Intro
     6. § Highlights (Bento)
     7. § Tech Timeline
     8. § Metrics
     9. § Cases
    10. Footer
    11. Reveal / Scroll animations
    12. Audio Player
    13. Responsive
   ========================================================================== */

/* ---------- 1. CSS Variables & Reset ---------- */
:root {
  --brand-1: #818cf8;
  --brand-2: #6366f1;
  --brand-3: #a78bfa;
  --bg-deep: #06060f;
  --bg-mid:  #0d0d1e;
  --bg-card: #131328;
  --bg-soft: #f8f8ff;
  --bg-paper: #ffffff;
  --text-light: #eaeaff;
  --text-light-dim: #9999c0;
  --text-dark:  #171717;
  --text-dark-dim: #525252;
  --accent-warm: #ffb86b;
  --accent-peach: #ff8ab0;
  --border-light: rgba(255, 255, 255, 0.08);
  --border-dark: rgba(0, 0, 16, 0.08);

  --ease-out: cubic-bezier(0.2, 0.8, 0.2, 1);
  --ease-in-out: cubic-bezier(0.65, 0.05, 0.35, 1);

  --nav-h: 64px;
  --container: 1200px;
  --radius-s: 10px;
  --radius-m: 16px;
  --radius-l: 24px;
}

*, *::before, *::after { box-sizing: border-box; }
html {
  scroll-behavior: smooth;   /* 仅用于锚点跳转；section 切换由 JS 劫持 */
}

body {
  margin: 0;
  font-family: 'Inter', 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-light);
  background: var(--bg-deep);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; transition: color .2s var(--ease-out); }
ul { list-style: none; padding: 0; margin: 0; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
code { font-family: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace; background: rgba(1,169,255,0.08); padding: 2px 6px; border-radius: 4px; font-size: 0.9em; }

/* ---------- 2. Global Typography & Utilities ---------- */
.gradient-text {
  background: linear-gradient(135deg, var(--brand-1), var(--brand-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.accent { color: var(--brand-1); }

.section {
  position: relative;
  padding: 120px 24px;
}
.section-header {
  max-width: var(--container);
  margin: 0 auto 64px;
  text-align: center;
}
.section-header.align-left {
  text-align: left;
  margin-left: max(24px, calc((100vw - var(--container)) / 2));
  margin-right: max(24px, calc((100vw - var(--container)) / 2));
  max-width: none;
}
.section-title {
  font-size: clamp(28px, 3.6vw, 48px);
  line-height: 1.2;
  margin: 12px 0 16px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.section-sub {
  font-size: 16px;
  color: var(--text-light-dim);
  max-width: 720px;
  margin: 0 auto;
}
.section-header.align-left .section-sub { margin: 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brand-1);
  border: 1px solid rgba(1,169,255,0.3);
  border-radius: 999px;
  background: rgba(1,169,255,0.06);
}

/* Section backgrounds — 全程深色，彼此平滑过渡 */
.section-hero        { background: radial-gradient(ellipse at 50% 40%, #12123a 0%, var(--bg-deep) 60%, #030310 100%); }
.section-intro       { background: linear-gradient(180deg, #030310 0%, #07071a 50%, #09091e 100%); color: var(--text-light); }
.section-highlights  { background: linear-gradient(180deg, #09091e 0%, #0d0d1e 100%); }
.section-tech        { background: linear-gradient(180deg, #0d0d1e 0%, #09091e 100%); color: var(--text-light); }
.section-metrics     { background: linear-gradient(180deg, #0d0d1e 0%, #06060f 100%); }
.section-emotion         { background: linear-gradient(180deg, #06060f 0%, #18142e 50%, #1e1028 100%); padding-bottom: 140px; }
.section-iq-eq           { background: linear-gradient(180deg, #06060f 0%, #0e0e2a 60%, #08081e 100%); }
.section-paralinguistic  { background: linear-gradient(180deg, #06060f 0%, #0c0c22 50%, #0a0a1c 100%); padding-bottom: 140px; }
.section-personas    { background: linear-gradient(180deg, #06060f 0%, #0a0a1e 60%, #0d0d1e 100%); padding-bottom: 140px; }
.section-expression      { background: linear-gradient(180deg, #0d0d1e 0%, #1a0e2a 55%, #1a0a20 100%); padding-bottom: 140px; }
.section-cases       { background: linear-gradient(180deg, #1a0a20 0%, #06060f 100%); color: var(--text-light); }

/* ---------- 3. Navigation ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 100;
  /* 初始完全隐藏：不可见、不可交互、向上偏移 */
  opacity: 0;
  transform: translateY(-100%);
  pointer-events: none;
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition:
    opacity 0.4s var(--ease-out),
    transform 0.4s var(--ease-out),
    background 0.4s var(--ease-out),
    border-color 0.4s var(--ease-out),
    backdrop-filter 0.4s var(--ease-out);
}
/* 滚出 hero 后从上方滑入 */
.nav.is-scrolled {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: rgba(6, 6, 20, 0.72);
  border-bottom: 1px solid var(--border-light);
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-light);
}
.nav-brand img { width: 22px; height: 22px; }
.nav-brand .nav-brand-mark {
  width: auto;
  height: 28px;
  display: block;
  /* 深色 nav 上将 logo 反白，hue-rotate 使圆环色调向靛蓝偏移 */
  filter: invert(1) hue-rotate(220deg) saturate(0.85);
}
.nav-links {
  display: flex;
  gap: 28px;
}
.nav-links a {
  font-size: 14px;
  color: var(--text-light-dim);
  position: relative;
  transition: color .2s var(--ease-out);
}
.nav-links a:hover { color: var(--text-light); }
.nav-links a.active { color: var(--text-light); }
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 2px;
  background: linear-gradient(90deg, var(--brand-1), var(--brand-2));
  transition: width .3s var(--ease-out);
  border-radius: 1px;
}
.nav-links a:hover::after { width: 100%; }
.nav-links a.active::after { width: 100%; }

/* ---------- 4. § Hero ---------- */
.section-hero {
  min-height: 100vh;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.hero-canvas-wrap {
  position: absolute;
  inset: 0;
  z-index: 1;
}
#hero-canvas {
  width: 100%;
  height: 100%;
  display: block;
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 760px;
  width: 100%;
  padding: 0 32px;
  /* 画布中心略低于屏幕中心（约 56vh），文字稍微上移让二者错开 */
  margin-top: -12vh;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* 入场动画：各元素依次淡入上移，与 model card heroFadeIn 一致 */
@keyframes heroFadeIn {
  to { opacity: 1; transform: translateY(0); }
}
.hero-content .hero-eyebrow,
.hero-content .hero-title,
.hero-content .hero-tagline {
  opacity: 0;
  transform: translateY(28px);
  animation: heroFadeIn 1s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
.hero-content .hero-eyebrow  { animation-delay: 0.05s; }
.hero-content .hero-title    { animation-delay: 0.15s; }
.hero-content .hero-tagline  { animation-delay: 0.28s; }

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.45);
  margin-bottom: 28px;
  pointer-events: auto;
}
.hero-eyebrow .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--brand-1);
  box-shadow: 0 0 12px rgba(129,140,248,0.7);
  animation: dotPulse 2.5s ease-in-out infinite;
  flex-shrink: 0;
}
@keyframes dotPulse {
  0%, 100% { box-shadow: 0 0 10px rgba(129,140,248,0.5); }
  50%       { box-shadow: 0 0 20px rgba(129,140,248,1), 0 0 40px rgba(129,140,248,0.3); }
}

.hero-title {
  margin: 0 0 16px;
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  justify-content: center;
  align-items: baseline;
  color: #fff;
}
.hero-title-mono {
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-weight: 500;
  font-size: 0.58em;
  color: var(--text-light-dim);
  letter-spacing: 0.04em;
}
.hero-tagline {
  font-size: clamp(1.3rem, 2.8vw, 2rem);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.75);
  margin: 0 0 0;
  letter-spacing: -0.01em;
  line-height: 1.4;
}
.hero-sub {
  font-size: clamp(14px, 1.1vw, 16px);
  font-weight: 300;
  color: rgba(255,255,255,0.5);
  margin: 0 auto;
  line-height: 1.75;
  max-width: 520px;
}
.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-light-dim);
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
}
.scroll-indicator-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(180deg, transparent, var(--brand-1));
  position: relative;
  overflow: hidden;
}
.scroll-indicator-line::after {
  content: '';
  position: absolute;
  top: -50%;
  left: 0;
  width: 1px;
  height: 50%;
  background: var(--brand-1);
  animation: scroll-drop 2s var(--ease-in-out) infinite;
}
@keyframes scroll-drop {
  0%   { top: -50%; opacity: 0; }
  30%  { opacity: 1; }
  100% { top: 100%; opacity: 0; }
}

/* ---------- 5. § Intro ---------- */
.intro-grid {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 80px;
  align-items: center;
}
.intro-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brand-2);
  font-weight: 600;
  margin-bottom: 20px;
}
.intro-eyebrow .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--brand-1);
  box-shadow: 0 0 0 4px rgba(129,140,248,0.22);
}
.intro-title {
  font-size: clamp(32px, 4.2vw, 60px);
  font-weight: 800;
  margin: 0 0 24px;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text-light);
}
.intro-title .accent {
  position: relative;
  color: var(--brand-1);
}
.intro-title .accent::after {
  content: '';
  position: absolute;
  left: -2px; right: -2px;
  bottom: 4px;
  height: 0.3em;
  background: rgba(129, 140, 248, 0.18);
  z-index: -1;
  border-radius: 4px;
}
.intro-body {
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-light-dim);
  margin: 0 0 32px;
  max-width: 540px;
}
.intro-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  transition: transform .2s var(--ease-out), box-shadow .2s var(--ease-out), background .2s var(--ease-out);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--brand-1), var(--brand-2));
  color: #fff;
  box-shadow: 0 8px 24px rgba(99,102,241,0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(99,102,241,0.45);
}
.btn-ghost {
  color: rgba(255,255,255,0.75);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.11);
  border-color: rgba(255,255,255,0.2);
  transform: translateY(-2px);
}

.intro-visual {
  position: relative;
}
.waveform {
  position: relative;
  padding: 48px 24px;
  border-radius: var(--radius-l);
  background: linear-gradient(135deg, rgba(129,140,248,0.1), rgba(99,102,241,0.04));
  border: 1px solid rgba(129,140,248,0.2);
  overflow: hidden;
  box-shadow: 0 0 60px rgba(99,102,241,0.08), inset 0 1px 0 rgba(255,255,255,0.05);
}
.waveform::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 50%, rgba(129,140,248,0.18), transparent 65%);
  pointer-events: none;
}
.waveform svg {
  width: 100%;
  height: 180px;
  display: block;
  position: relative;
}
.waveform-caption {
  text-align: center;
  margin-top: 20px;
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 13px;
  color: var(--brand-1);
  letter-spacing: 0.2em;
}

/* ---------- 6. § Highlights (Bento) ---------- */
.bento-grid {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: auto auto;
  gap: 20px;
}
.bento-card {
  position: relative;
  padding: 36px;
  border-radius: var(--radius-l);
  background: linear-gradient(135deg, rgba(1,169,255,0.06), rgba(1,96,255,0.02));
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: transform .3s var(--ease-out), border-color .3s var(--ease-out);
}
.bento-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(1,169,255,0.4), transparent 50%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  opacity: 0;
  transition: opacity .3s var(--ease-out);
  pointer-events: none;
}
.bento-card::after {
  content: '';
  position: absolute;
  width: 220px; height: 220px;
  top: -40%; right: -20%;
  background: radial-gradient(circle, rgba(1,169,255,0.18), transparent 60%);
  filter: blur(30px);
  opacity: 0;
  transition: opacity .4s var(--ease-out);
  pointer-events: none;
}
.bento-card:hover { transform: translateY(-4px); border-color: rgba(1,169,255,0.35); }
.bento-card:hover::before { opacity: 1; }
.bento-card:hover::after { opacity: 1; }

.bento-card.size-large { grid-column: span 2; }
.bento-card.size-small { grid-column: span 1; }

.bento-icon {
  width: 44px; height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--brand-1), var(--brand-2));
  color: #fff;
  margin-bottom: 20px;
}
.bento-icon svg { width: 22px; height: 22px; fill: currentColor; }

.bento-tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--accent-warm);
  margin-bottom: 8px;
  font-weight: 600;
  text-transform: uppercase;
}
.bento-title {
  font-size: 24px;
  margin: 0 0 14px;
  font-weight: 700;
  color: var(--text-light);
  letter-spacing: -0.01em;
}
.bento-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-light-dim);
  margin: 0;
}
.bento-card.size-large .bento-title { font-size: 28px; }

/* ---------- 7. § Tech Timeline ---------- */
.timeline {
  max-width: 880px;
  margin: 0 auto;
  position: relative;
  padding-left: 48px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 16px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--brand-1), var(--brand-2) 50%, rgba(99,102,241,0.15));
  border-radius: 2px;
}
.timeline-item {
  position: relative;
  padding: 14px 0 44px;
}
.timeline-item:last-child { padding-bottom: 0; }

.timeline-dot {
  position: absolute;
  left: -40px; top: 20px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--bg-mid);
  border: 2px solid var(--brand-1);
  box-shadow: 0 0 0 6px rgba(129,140,248,0.14), 0 0 0 12px rgba(129,140,248,0.06);
}
.timeline-step {
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 12px;
  color: var(--brand-2);
  letter-spacing: 0.2em;
  margin-bottom: 8px;
  font-weight: 600;
}
.timeline-title {
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 700;
  margin: 0 0 4px;
  color: var(--text-light);
  letter-spacing: -0.01em;
}
.timeline-sub {
  font-size: 15px;
  color: var(--brand-2);
  margin: 0 0 14px;
  font-weight: 500;
}
.timeline-desc {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-light-dim);
  margin: 0;
  max-width: 680px;
}

/* ---------- 8. § Metrics ---------- */
.metrics-layout {
  max-width: 760px;
  margin: 0 auto;
}
.metrics-chart {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-l);
  padding: 32px;
}
.chart-title {
  font-size: 14px;
  color: var(--text-light-dim);
  margin: 0 0 24px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.bar-row {
  margin-bottom: 18px;
}
.bar-row:last-child { margin-bottom: 0; }
.bar-row-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 6px;
}
.bar-row-label-text {
  font-size: 13px;
  color: var(--text-light);
  font-weight: 500;
}
.bar-row-label-hint {
  font-size: 11px;
  color: var(--text-light-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.bar-track {
  position: relative;
  height: 10px;
  background: rgba(255,255,255,0.06);
  border-radius: 999px;
  overflow: hidden;
}
.bar-fill {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 0;
  background: linear-gradient(90deg, var(--brand-1), var(--brand-2));
  border-radius: 999px;
  transition: width 1.2s var(--ease-out);
}
.bar-value {
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 18px;
  color: var(--brand-1);
  font-weight: 600;
  margin-left: 12px;
}

.metrics-table-wrap {
  overflow-x: auto;
}
.metrics-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.metrics-table th,
.metrics-table td {
  padding: 12px 10px;
  text-align: right;
  border-bottom: 1px solid var(--border-light);
  white-space: nowrap;
}
.metrics-table th:first-child,
.metrics-table td:first-child {
  text-align: left;
  color: var(--text-light);
}
.metrics-table th {
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-light-dim);
  font-weight: 500;
}
.metrics-table td {
  color: var(--text-light-dim);
  font-family: 'JetBrains Mono', Consolas, monospace;
}
.metrics-table tr.ours {
  background: linear-gradient(90deg, rgba(1,169,255,0.1), rgba(1,96,255,0.04));
}
.metrics-table tr.ours td:first-child {
  color: var(--brand-1);
  font-weight: 600;
  font-family: inherit;
}
.metrics-table tr.ours td { color: var(--text-light); font-weight: 600; }

/* ---------- 8.5 § Abilities (弧形转盘 + sticky 滚动) ---------- */
.section-iq-eq {
  padding: 0;  /* section 高度完全交给 ability-track 管理；主标题移入 sticky 内部 */
}
/* 滚动轨道：总高度 = 视口高度 + (N-1) × 每卡滚动距离 */
.ability-track {
  position: relative;
  --ability-step: 75vh;
  --ability-count: 4;
  height: calc(100vh + (var(--ability-count) - 1) * var(--ability-step));
}
.ability-sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.ability-stage {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(24px, 5vw, 64px);
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(40px, 5vw, 80px);
  align-items: center;
  position: relative;
}

/* ---- 左侧详情栏：上半常驻主标题 + 下半 per-card 正文 ---- */
.ability-detail {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 32px;
  max-width: 600px;
  min-height: 600px;
}

/* 常驻主标题区 */
.ability-main-header {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.ability-main-header .eyebrow { align-self: flex-start; }
.ability-main-title {
  font-size: clamp(30px, 3.6vw, 46px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--text-light);
}
.ability-main-sub {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-light-dim);
  margin: 0;
  max-width: 520px;
}

/* Per-card 正文（淡入淡出） */
.ability-detail-body {
  display: flex;
  flex-direction: column;
  transition: opacity 0.28s var(--ease-out);
}
.ability-detail-body.fading { opacity: 0; }

.ability-detail-index {
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--ability-accent, var(--brand-1));
  margin-bottom: 8px;
  font-weight: 600;
  text-transform: uppercase;
}
.ability-detail-title {
  /* 缩小 — 让位给主标题 */
  font-size: clamp(18px, 1.7vw, 22px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
  color: var(--ability-accent, var(--brand-1));
}
.ability-detail-tagline {
  font-size: clamp(16px, 1.4vw, 19px);
  color: var(--text-light);
  font-weight: 500;
  line-height: 1.45;
  margin: 0 0 14px;
  opacity: 0.95;
}
.ability-detail-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-light-dim);
  margin: 0 0 18px;
}
.ability-detail-scenes {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.ability-detail-scene {
  position: relative;
  padding-left: 18px;
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.55;
}
.ability-detail-scene::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 9px;
  height: 2px;
  background: var(--ability-accent, var(--brand-1));
  border-radius: 2px;
}

/* 音频 + 示波器行 */
.ability-audio-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  transition: border-color 0.25s var(--ease-out);
}
.ability-audio-row:hover { border-color: rgba(1, 169, 255, 0.35); }
.ability-audio-row.playing { border-color: var(--brand-1); }

.ability-play-btn {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-1), var(--brand-2));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s var(--ease-out), box-shadow 0.3s var(--ease-out);
  box-shadow: 0 6px 20px rgba(1, 96, 255, 0.3);
}
.ability-play-btn:hover { transform: scale(1.06); }
.ability-play-btn svg { width: 13px; height: 13px; fill: currentColor; }
.ability-play-btn .pause-icon { display: none; }
.ability-audio-row.playing .ability-play-btn .play-icon  { display: none; }
.ability-audio-row.playing .ability-play-btn .pause-icon { display: block; }

.ability-wave-wrap {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.ability-wave-canvas {
  width: 100%;
  height: 38px;
  display: block;
}
.ability-wave-meta {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-light-dim);
  font-family: 'JetBrains Mono', Consolas, monospace;
  letter-spacing: 0.06em;
}
.ability-wave-caption { font-weight: 500; }

/* ---- 右侧卡片转盘（弧形） ---- */
.ability-carousel {
  position: relative;
  height: 100%;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 1600px;
}

.ability-card {
  position: absolute;
  width: clamp(220px, 24vw, 310px);
  aspect-ratio: 4 / 5;
  border-radius: 24px;
  padding: 28px 28px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: linear-gradient(160deg, rgba(20, 20, 52, 0.88) 0%, rgba(10, 10, 28, 0.92) 55%, rgba(5, 5, 18, 0.82) 100%);
  border: 1px solid var(--border-light);
  transition:
    transform 0.75s cubic-bezier(0.34, 1.35, 0.64, 1),
    opacity 0.45s var(--ease-out),
    box-shadow 0.5s var(--ease-out),
    border-color 0.5s var(--ease-out);
  will-change: transform, opacity;
  overflow: hidden;
  isolation: isolate;
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.35);
}
.ability-card::before {
  content: '';
  position: absolute;
  inset: -10% -10% auto auto;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--ability-accent, var(--brand-1)), transparent 70%);
  filter: blur(44px);
  opacity: 0.25;
  transition: opacity 0.5s var(--ease-out);
  z-index: 0;
  pointer-events: none;
}
.ability-card.is-active::before { opacity: 0.55; }
.ability-card > *:not(.ability-card-bg) { position: relative; z-index: 1; }
.ability-card.is-active {
  border-color: var(--ability-accent, var(--brand-1));
  box-shadow:
    0 30px 70px rgba(0, 0, 0, 0.5),
    0 0 0 1px var(--ability-accent, var(--brand-1)) inset,
    0 0 40px rgba(1, 169, 255, 0.15);
}

/* 背景图层：真实 DOM 节点，避免 CSS var(url) 路径解析问题 */
.ability-card-bg {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  opacity: 0.28;
  z-index: 0;
  pointer-events: none;
  transition: opacity 0.5s var(--ease-out), transform 0.6s var(--ease-out);
}
.ability-card.is-active .ability-card-bg {
  opacity: 0.55;
}
.ability-card-content {
  position: relative;
  z-index: 1;
}

.ability-card-index {
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--ability-accent, var(--brand-1));
  font-weight: 700;
}
.ability-card-subtitle {
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-light-dim);
  margin-top: 4px;
}
.ability-card-title {
  font-size: clamp(22px, 2.3vw, 28px);
  font-weight: 800;
  line-height: 1.1;
  margin: 14px 0 0;
  color: var(--text-light);
  letter-spacing: -0.015em;
}
.ability-card-mini-wave {
  display: flex;
  gap: 3px;
  align-items: flex-end;
  height: 42px;
  margin-top: auto;
}
.ability-card-mini-wave span {
  display: block;
  flex: 1;
  min-width: 2px;
  border-radius: 1.5px;
  background: linear-gradient(180deg, var(--ability-accent, var(--brand-1)), var(--ability-accent2, var(--brand-2)));
  transform-origin: bottom center;
  opacity: 0.5;
  transition: opacity 0.4s var(--ease-out);
}
.ability-card.is-active .ability-card-mini-wave span {
  opacity: 0.9;
  animation: abilityCardBar var(--bar-dur, 1.4s) ease-in-out var(--bar-delay, 0s) infinite alternate;
}
@keyframes abilityCardBar {
  from { transform: scaleY(0.25); }
  to   { transform: scaleY(1); }
}

@media (max-width: 960px) {
  .ability-stage {
    grid-template-columns: 1fr;
    grid-template-rows: auto 360px;
    gap: 24px;
    padding: 24px;
  }
  .ability-detail { min-height: auto; gap: 20px; }
  .ability-carousel { min-height: 360px; }
  .ability-card { width: clamp(200px, 56vw, 280px); }
}


/* ---------- 8.6 § Personas (seed 风格横向大卡片画廊) ---------- */
.persona-gallery {
  position: relative;
  width: 100vw;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  cursor: grab;
  padding-block: 16px;
}
.persona-gallery::-webkit-scrollbar { display: none; }
.persona-gallery.dragging { cursor: grabbing; scroll-snap-type: none; }

.persona-track {
  display: flex;
  gap: clamp(24px, 3vw, 40px);
  /* 关键：左右 padding ≥ (viewport - card) / 2，保证首尾卡片能 snap 到正中 */
  padding-inline: max(calc((100vw - 880px) / 2 + 16px), 32px);
  padding-block: 12px;
  width: max-content;
  align-items: center;
}
.persona-track > * { user-select: none; -webkit-user-select: none; }

.persona-card {
  flex: 0 0 auto;
  width: clamp(420px, 70vw, 880px);
  aspect-ratio: 16 / 9;
  scroll-snap-align: center;
  border-radius: 32px;
  overflow: hidden;
  position: relative;
  isolation: isolate;
  background: #0c1729;
  border: 1px solid var(--border-light);
  cursor: pointer;
  transform: scale(0.95);
  opacity: 0.6;
  transition: transform .6s var(--ease-out), opacity .6s var(--ease-out), border-color .4s var(--ease-out), box-shadow .4s var(--ease-out);
}
.persona-card.is-focus {
  transform: scale(1);
  opacity: 1;
  box-shadow: 0 30px 80px rgba(0, 12, 32, 0.5);
}
.persona-card:hover.is-focus {
  border-color: rgba(255,255,255,0.24);
}
.persona-card.active {
  border-color: var(--persona-accent, var(--brand-1));
  box-shadow: 0 30px 80px rgba(1, 96, 255, 0.35),
              0 0 0 1px var(--persona-accent, var(--brand-1)) inset;
}

/* 头像 / 视频媒体层 */
.persona-media {
  position: absolute;
  inset: 0;
}
.persona-avatar {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity .6s var(--ease-out), transform 8s linear;
}
.persona-card.is-focus .persona-avatar { transform: scale(1.04); }
.persona-card.active .persona-avatar { opacity: 0; }
.persona-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity .6s var(--ease-out);
  pointer-events: none;
  user-select: none;
  -webkit-user-select: none;
}
.persona-card.active .persona-video { opacity: 1; }

/* 底部信息蒙层 */
.persona-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(6, 16, 36, 0) 0%,
    rgba(6, 16, 36, 0) 40%,
    rgba(6, 16, 36, 0.65) 78%,
    rgba(6, 16, 36, 0.92) 100%
  );
  z-index: 1;
  pointer-events: none;
}
.persona-info {
  position: absolute;
  left: clamp(24px, 3.5vw, 48px);
  right: clamp(24px, 3.5vw, 48px);
  bottom: clamp(24px, 3.5vw, 48px);
  z-index: 2;
  color: #fff;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  transition: opacity 0.35s var(--ease-out), transform 0.35s var(--ease-out);
}
/* 播放时隐藏 name/desc，避免和字幕冲突 */
.persona-card.active .persona-info {
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
}
.persona-info-text {
  flex: 1;
  min-width: 0;
}
.persona-tag {
  display: inline-block;
  padding: 5px 14px;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.3);
  background: rgba(255,255,255,0.08);
  margin-bottom: 12px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: rgba(255,255,255,0.95);
}
.persona-name {
  font-size: clamp(26px, 3.4vw, 44px);
  font-weight: 800;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
  line-height: 1.1;
  text-shadow: 0 4px 24px rgba(0,0,0,0.5);
}
.persona-desc {
  font-size: clamp(13px, 1.15vw, 15px);
  line-height: 1.65;
  color: rgba(255,255,255,0.85);
  margin: 0;
  max-width: 460px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

/* 中心大 play 按钮（idle 时提示可点击，active 时淡出） */
.persona-poster-play {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%) scale(1);
  z-index: 2;
  width: 72px; height: 72px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform 0.3s var(--ease-out), opacity 0.3s var(--ease-out), background 0.25s var(--ease-out);
  opacity: 0;
  pointer-events: none;
}
.persona-card.is-focus:not(.active):hover .persona-poster-play {
  opacity: 1;
}
.persona-card.is-focus:not(.active):hover .persona-poster-play:hover {
  transform: translate(-50%, -50%) scale(1.08);
  background: rgba(255, 255, 255, 0.28);
}
.persona-poster-play svg { width: 22px; height: 22px; fill: currentColor; }

/* 底部控件条（时间轴 + 播放/暂停 + 时间码），仅 active + hover 显示 */
.persona-controls {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 56px;
  padding: 0 clamp(16px, 2vw, 24px);
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 14px;
  background: linear-gradient(0deg, rgba(0, 0, 0, 0.82) 0%, rgba(0, 0, 0, 0.5) 60%, rgba(0, 0, 0, 0) 100%);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.28s var(--ease-out), transform 0.28s var(--ease-out);
  pointer-events: none;
}
.persona-card.active:hover .persona-controls {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
/* 触屏：active 时常驻控件，手势替代 hover */
@media (pointer: coarse) {
  .persona-card.active .persona-controls {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
}

.persona-ctrl-play {
  flex-shrink: 0;
  width: 34px; height: 34px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.2s var(--ease-out), transform 0.2s var(--ease-out);
}
.persona-ctrl-play:hover { background: rgba(255, 255, 255, 0.3); transform: scale(1.06); }
.persona-ctrl-play svg { width: 12px; height: 12px; fill: currentColor; }
.persona-ctrl-play .pause-icon { display: none; }
.persona-card.active .persona-ctrl-play .play-icon  { display: none; }
.persona-card.active .persona-ctrl-play .pause-icon { display: block; }

.persona-ctrl-time {
  flex-shrink: 0;
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.95);
  font-variant-numeric: tabular-nums;
  min-width: 36px;
  text-align: center;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
}

.persona-progress {
  flex: 1;
  height: 24px;
  display: flex;
  align-items: center;
  cursor: pointer;
  position: relative;
}
.persona-progress-track {
  width: 100%;
  height: 3px;
  background: rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  position: relative;
  transition: height 0.15s var(--ease-out);
}
.persona-progress:hover .persona-progress-track,
.persona-progress.dragging .persona-progress-track {
  height: 5px;
}
.persona-progress-fill {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 0%;
  background: linear-gradient(90deg,
    var(--persona-accent, var(--brand-1)),
    color-mix(in srgb, var(--persona-accent, var(--brand-1)) 40%, white));
  border-radius: 999px;
}
.persona-progress-thumb {
  position: absolute;
  top: 50%;
  left: 0%;
  transform: translate(-50%, -50%) scale(0);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
  transition: transform 0.15s var(--ease-out);
  pointer-events: none;
}
.persona-progress:hover .persona-progress-thumb,
.persona-progress.dragging .persona-progress-thumb {
  transform: translate(-50%, -50%) scale(1);
}

/* 正在播放指示 */
.persona-pulse {
  display: none;
  position: absolute;
  top: clamp(20px, 3vw, 40px);
  left: clamp(20px, 3vw, 40px);
  z-index: 3;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: #fff;
  text-shadow: 0 2px 10px rgba(0,0,0,0.6);
  font-weight: 500;
}
.persona-pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ff4f6e;
  box-shadow: 0 0 0 4px rgba(255,79,110,0.25);
  animation: personaPulse 1.4s ease-in-out infinite;
}
@keyframes personaPulse {
  0%, 100% { transform: scale(1);   opacity: 1; }
  50%      { transform: scale(0.7); opacity: 0.7; }
}
.persona-card.active .persona-pulse { display: flex; }

/* 字幕 overlay — 同步到音频 currentTime，放在视频底部 */
.persona-caption {
  position: absolute;
  left: clamp(24px, 4vw, 56px);
  right: clamp(24px, 4vw, 56px);
  bottom: 32px;
  z-index: 3;
  opacity: 0;
  transition: opacity 0.25s var(--ease-out), bottom 0.3s var(--ease-out);
  pointer-events: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 40%;
  overflow: hidden;
}
.persona-card.active .persona-caption { opacity: 1; }
/* 悬停时控件条出现，字幕上移避免遮挡 */
.persona-card.active:hover .persona-caption { bottom: 80px; }
@media (pointer: coarse) {
  .persona-card.active .persona-caption { bottom: 80px; }
}

.persona-caption-line {
  display: inline-block;
  align-self: flex-start;
  max-width: min(85%, 560px);
  padding: 10px 16px;
  border-radius: 14px;
  font-size: clamp(14px, 1.2vw, 16px);
  line-height: 1.55;
  color: #fff;
  background: rgba(6, 16, 36, 0.72);
  backdrop-filter: blur(12px) saturate(1.2);
  -webkit-backdrop-filter: blur(12px) saturate(1.2);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  animation: captionIn 0.25s var(--ease-out);
}
.persona-caption-line[data-speaker="user"] {
  background: rgba(6, 16, 36, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.18);
  align-self: flex-start;
}
.persona-caption-line[data-speaker="assistant"] {
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--persona-accent, #818cf8) 40%, rgba(13,13,35,0.75)),
    rgba(13, 13, 35, 0.85));
  border: 1px solid color-mix(in srgb, var(--persona-accent, #818cf8) 40%, transparent);
  align-self: flex-end;
}
.persona-caption-speaker {
  display: inline-block;
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-weight: 700;
  opacity: 0.8;
  margin-right: 8px;
  font-family: 'JetBrains Mono', Consolas, monospace;
  vertical-align: middle;
}
.persona-caption-line[data-speaker="user"] .persona-caption-speaker { color: #ffffff; }
.persona-caption-line[data-speaker="assistant"] .persona-caption-speaker {
  color: color-mix(in srgb, var(--persona-accent, #818cf8) 80%, white);
}
@keyframes captionIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* 加载/错误提示 */
.persona-state {
  position: absolute;
  top: clamp(20px, 3vw, 40px);
  right: clamp(20px, 3vw, 40px);
  z-index: 3;
  font-size: 11px;
  letter-spacing: 0.14em;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.28);
  color: rgba(255,255,255,0.9);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

/* 底部 meta 行（翻页指示 + 左右按钮） */
.persona-gallery-meta {
  max-width: var(--container);
  margin: 40px auto 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 24px;
}
.persona-indicator {
  display: flex;
  gap: 8px;
  align-items: center;
}
.persona-indicator-dot {
  width: 28px;
  height: 3px;
  background: rgba(255,255,255,0.15);
  border-radius: 2px;
  transition: background .3s var(--ease-out), width .3s var(--ease-out);
  cursor: pointer;
}
.persona-indicator-dot.active {
  background: var(--brand-1);
  width: 56px;
}
.persona-nav-btns {
  display: flex;
  gap: 12px;
}
.persona-nav {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--border-light);
  color: var(--text-light);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .2s var(--ease-out), border-color .2s var(--ease-out), opacity .2s var(--ease-out);
}
.persona-nav:hover { background: rgba(1,169,255,0.18); border-color: rgba(1,169,255,0.5); }
.persona-nav:disabled { opacity: 0.3; pointer-events: none; }

@media (max-width: 720px) {
  .persona-card { width: 86vw; border-radius: 24px; }
  .persona-gallery-meta { flex-direction: column; gap: 20px; }
}


/* ---------- 8.7 § Emotion (左 grid + 右纯文字详情，仿 iq-eq 风格) ---------- */
.section-emotion {
  padding-top: 120px;
}
.section-emotion > .section-header {
  max-width: var(--container);
  margin: 0 auto 60px;
  padding: 0 24px;
}
.emotion-layout {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: clamp(40px, 5vw, 80px);
  align-items: start;
}

/* ---- 左：场景卡 grid ---- */
.emotion-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}
.emotion-card {
  position: relative;
  text-align: left;
  padding: 22px 22px 18px;
  border-radius: 16px;
  background: rgba(255, 184, 107, 0.04);
  border: 1px solid rgba(255, 184, 107, 0.18);
  cursor: pointer;
  isolation: isolate;
  overflow: hidden;
  transition: transform 0.3s var(--ease-out), border-color 0.3s var(--ease-out), background 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 120px;
  font: inherit;
  color: inherit;
}
.emotion-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(255, 184, 107, 0.4), transparent 60%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.3s var(--ease-out);
  pointer-events: none;
  z-index: 0;
}
.emotion-card > * { position: relative; z-index: 1; }
.emotion-card:hover {
  transform: translateY(-5px);
  background: rgba(255, 184, 107, 0.07);
  border-color: rgba(255, 184, 107, 0.35);
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.35);
}
.emotion-card:hover::before { opacity: 1; }
.emotion-card.is-selected {
  background: rgba(255, 184, 107, 0.1);
  border-color: #ffb86b;
  box-shadow:
    0 18px 40px rgba(0, 0, 0, 0.4),
    0 0 0 1px #ffb86b inset;
}

.emotion-card-tag {
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: #ffb86b;
  font-weight: 600;
}
.emotion-card-title {
  font-size: clamp(16px, 1.4vw, 18px);
  font-weight: 700;
  color: var(--text-light);
  margin: 0;
  letter-spacing: -0.005em;
  line-height: 1.3;
}
.emotion-card-hint {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--text-light-dim);
  margin: 0;
  flex: 1;
}
/* 卡片底部控件：迷你波形 + 小播放/暂停 */
.emotion-card-controls {
  margin-top: auto;
  padding-top: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.emotion-card-wave {
  flex: 1;
  height: 22px;
  display: block;
  min-width: 0;
}
.emotion-card-play {
  flex-shrink: 0;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, #ffb86b, #ff8ab0);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out);
  box-shadow: 0 4px 12px rgba(255, 184, 107, 0.25);
  border: 0;
  padding: 0;
  cursor: pointer;
}
.emotion-card-play:hover { transform: scale(1.1); }
.emotion-card-play svg { width: 10px; height: 10px; fill: currentColor; }
.emotion-card-play .pause-icon { display: none; }
.emotion-card.is-playing .emotion-card-play .play-icon  { display: none; }
.emotion-card.is-playing .emotion-card-play .pause-icon { display: block; }

/* ---- 右：纯文字详情（无框） ---- */
.emotion-detail {
  position: sticky;
  top: 100px;
  display: flex;
  flex-direction: column;
  gap: 32px;
  max-width: 600px;
  /* 注意：此处刻意不加 background/border/padding，保持透明纯文字 */
}
.emotion-main-header {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.emotion-main-header .eyebrow { align-self: flex-start; }
.emotion-main-title {
  font-size: clamp(30px, 3.6vw, 46px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--text-light);
}
.emotion-main-title .accent { color: #ffb86b; }
.emotion-main-sub {
  margin: 0;
  font-size: clamp(14px, 1.05vw, 16px);
  line-height: 1.7;
  color: var(--text-muted, rgba(255, 255, 255, 0.7));
  max-width: 46ch;
}

/* per-case 正文（淡入淡出） */
.emotion-detail-body {
  display: flex;
  flex-direction: column;
  transition: opacity 0.25s var(--ease-out);
}
.emotion-detail-body.fading { opacity: 0; }

.emotion-detail-index {
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: #ffb86b;
  margin-bottom: 8px;
  font-weight: 600;
  text-transform: uppercase;
}
.emotion-detail-title {
  font-size: clamp(18px, 1.7vw, 22px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
  color: #ffb86b;
}
.emotion-detail-quote {
  font-family: 'Noto Serif SC', 'Source Han Serif SC', Georgia, serif;
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.7;
  color: var(--text-light);
  margin: 0 0 18px;
  padding-left: 20px;
  border-left: 3px solid rgba(255, 184, 107, 0.6);
  font-style: italic;
}
.emotion-detail-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-light-dim);
  margin: 0 0 22px;
}
.emotion-detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}
.emotion-tag {
  font-size: 11px;
  padding: 4px 11px;
  border-radius: 999px;
  color: #ffb86b;
  background: rgba(255, 184, 107, 0.08);
  border: 1px solid rgba(255, 184, 107, 0.28);
  letter-spacing: 0.04em;
}

/* ---- 右侧特性列表 ---- */
.emotion-feat-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.emotion-feat-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-light-dim);
  line-height: 1.5;
}
.emotion-feat-dot {
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #ffb86b;
  box-shadow: 0 0 8px rgba(255, 184, 107, 0.6);
}

/* ---- 左：大视频播放器 ---- */
.emotion-video-wrap {
  position: relative;
  border-radius: 22px;
  overflow: hidden;
  background: rgba(6, 16, 36, 0.6);
  border: 1px solid rgba(255, 184, 107, 0.18);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.45);
  aspect-ratio: 16 / 9;
}
.emotion-video {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  cursor: pointer;
}
.emotion-video-play {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 88px;
  height: 88px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 184, 107, 0.92);
  color: #1a0e22;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.3s var(--ease-out), transform 0.2s var(--ease-out), background 0.2s var(--ease-out);
  box-shadow: 0 12px 32px rgba(255, 184, 107, 0.35);
}
.emotion-video-play svg { width: 36px; height: 36px; fill: currentColor; transform: translateX(2px); }
.emotion-video-play:hover { transform: scale(1.06); background: #ffd6a8; }
.emotion-video-play.is-playing { opacity: 0; pointer-events: none; }
.emotion-video-wrap:hover .emotion-video-play.is-playing { opacity: 0.85; pointer-events: auto; }

@media (max-width: 880px) {
  .emotion-layout { grid-template-columns: 1fr; }
  .emotion-detail { position: static; }
}


/* ---------- 8.8 § Paralinguistic (诊断面板) ---------- */
.section-paralinguistic {
  padding-top: 120px;
  position: relative;
}
.section-paralinguistic::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(129, 140, 248, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(129, 140, 248, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at 50% 50%, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 50%, black 30%, transparent 80%);
}
.section-paralinguistic > .section-header,
.section-paralinguistic > .para-list {
  position: relative;
  z-index: 1;
}
.section-paralinguistic > .section-header {
  max-width: var(--container);
  margin: 0 auto 60px;
  padding: 0 24px;
}
.para-list {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.para-case {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  padding: 32px clamp(28px, 3vw, 40px);
  border-radius: 20px;
  background: rgba(12, 12, 30, 0.6);
  border: 1px solid rgba(129, 140, 248, 0.2);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}
.para-case:hover {
  border-color: rgba(129, 140, 248, 0.45);
  transform: translateY(-2px);
}
.para-left {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 20px;
  min-width: 0;
}
.para-index {
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 12px;
  color: var(--para-accent, #818cf8);
  letter-spacing: 0.3em;
  font-weight: 600;
}
.para-title {
  font-size: clamp(20px, 2.1vw, 26px);
  font-weight: 800;
  color: var(--text-light);
  margin: 6px 0 10px;
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.para-tagline {
  font-size: 14px;
  color: var(--text-light);
  font-weight: 500;
  line-height: 1.5;
  margin: 0 0 10px;
  opacity: 0.92;
}
.para-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-light-dim);
  margin: 0;
}
.para-audio-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: rgba(129, 140, 248, 0.06);
  border: 1px solid rgba(129, 140, 248, 0.22);
  border-radius: 10px;
  transition: border-color 0.25s var(--ease-out);
  margin-top: auto;
}
.para-audio-row:hover { border-color: rgba(129, 140, 248, 0.5); }
.para-audio-row.playing {
  border-color: var(--para-accent, #818cf8);
  background: rgba(129, 140, 248, 0.12);
}
.para-audio-btn {
  width: 38px; height: 38px; flex-shrink: 0; border-radius: 50%;
  background: var(--para-accent, #818cf8);
  color: #06060f;
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.2s var(--ease-out);
}
.para-audio-btn:hover { transform: scale(1.06); }
.para-audio-btn svg { width: 12px; height: 12px; fill: currentColor; }
.para-audio-btn .pause-icon { display: none; }
.para-audio-row.playing .para-audio-btn .play-icon  { display: none; }
.para-audio-row.playing .para-audio-btn .pause-icon { display: block; }
.para-audio-label {
  flex: 1;
  font-size: 12px;
  color: var(--text-light-dim);
  letter-spacing: 0.05em;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.para-audio-time {
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 11px;
  color: var(--text-light-dim);
  flex-shrink: 0;
}
.para-right {
  padding: 22px 24px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(129, 140, 248, 0.06), rgba(99, 102, 241, 0.03));
  border: 1px solid rgba(129, 140, 248, 0.18);
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.para-right-head {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--para-accent, #818cf8);
  font-weight: 700;
}
.para-right-head::before {
  content: '';
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--para-accent, #818cf8);
  box-shadow: 0 0 12px var(--para-accent, #818cf8);
  animation: paraPulse 1.6s ease-in-out infinite;
}
@keyframes paraPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.4; transform: scale(0.7); }
}
.para-detect-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 18px;
}
.para-detect-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.08);
}
.para-detect-icon {
  font-size: 16px;
  flex-shrink: 0;
}
.para-detect-label {
  font-size: 11px;
  color: var(--text-light-dim);
  letter-spacing: 0.1em;
  min-width: 40px;
}
.para-detect-value {
  font-size: 13px;
  color: var(--text-light);
  font-weight: 500;
  flex: 1;
}

@media (max-width: 720px) {
  .para-case { grid-template-columns: 1fr; }
  .para-detect-list { grid-template-columns: 1fr; }
}


/* ---------- 8.9 § Expression (中心 stage) ---------- */
.section-expression {
  padding-top: 120px;
  position: relative;
  overflow: hidden;
}
.section-expression::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 50%;
  width: 900px;
  height: 900px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.18), transparent 60%);
  filter: blur(90px);
  transform: translate(-50%, -50%);
  pointer-events: none;
}
.section-expression > .section-header,
.section-expression > .expr-stage {
  position: relative;
  z-index: 1;
}
.section-expression > .section-header {
  max-width: var(--container);
  margin: 0 auto 60px;
  padding: 0 24px;
}
.expr-stage {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}
.expr-card {
  position: relative;
  padding: 56px clamp(32px, 5vw, 72px) 48px;
  border-radius: 32px;
  background:
    radial-gradient(ellipse at 20% 10%, rgba(168, 85, 247, 0.18), transparent 60%),
    linear-gradient(160deg, rgba(26, 14, 42, 0.7), rgba(14, 8, 22, 0.92));
  border: 1px solid rgba(168, 85, 247, 0.28);
  box-shadow:
    0 40px 100px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.03) inset;
  overflow: hidden;
  isolation: isolate;
}
.expr-card-head {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 32px;
}
.expr-subtitle {
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: #a855f7;
  font-weight: 600;
}
.expr-title {
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 800;
  color: var(--text-light);
  margin: 0;
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.expr-tagline {
  font-size: clamp(16px, 1.5vw, 19px);
  color: var(--text-light);
  font-weight: 500;
  margin: 0;
  line-height: 1.5;
  opacity: 0.95;
}
.expr-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-light-dim);
  margin: 0 0 32px;
  max-width: 640px;
}
.expr-player {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 24px 28px;
  background: rgba(168, 85, 247, 0.05);
  border: 1px solid rgba(168, 85, 247, 0.25);
  border-radius: 20px;
  margin-bottom: 32px;
  transition: border-color 0.25s var(--ease-out);
}
.expr-player:hover { border-color: rgba(168, 85, 247, 0.5); }
.expr-player.playing { border-color: #a855f7; }
.expr-play-btn {
  width: 64px; height: 64px; flex-shrink: 0; border-radius: 50%;
  background: linear-gradient(135deg, #a855f7, #818cf8);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.2s var(--ease-out);
  box-shadow: 0 12px 30px rgba(168, 85, 247, 0.4);
}
.expr-play-btn:hover { transform: scale(1.06); }
.expr-play-btn svg { width: 18px; height: 18px; fill: currentColor; }
.expr-play-btn .pause-icon { display: none; }
.expr-player.playing .expr-play-btn .play-icon  { display: none; }
.expr-player.playing .expr-play-btn .pause-icon { display: block; }
.expr-wave-wrap {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.expr-wave-canvas {
  width: 100%;
  height: 56px;
  display: block;
}
.expr-wave-meta {
  display: flex;
  justify-content: space-between;
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 11px;
  color: var(--text-light-dim);
  letter-spacing: 0.06em;
}
.expr-performs-label {
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-light-dim);
  margin-bottom: 14px;
}
.expr-performs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.expr-perform-tag {
  font-size: 13px;
  padding: 7px 16px;
  border-radius: 999px;
  color: #e8d4ff;
  background: rgba(168, 85, 247, 0.08);
  border: 1px solid rgba(168, 85, 247, 0.35);
  transition: background 0.2s var(--ease-out), transform 0.2s var(--ease-out);
}
.expr-perform-tag:hover {
  background: rgba(168, 85, 247, 0.2);
  transform: translateY(-1px);
}

@media (max-width: 720px) {
  .expr-player { flex-direction: column; align-items: stretch; }
}


/* ---------- 9. § Cases ---------- */
.case-tabs {
  max-width: var(--container);
  margin: 0 auto 40px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  padding: 6px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-light);
  border-radius: 999px;
  width: fit-content;
}
.case-tab {
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-light-dim);
  transition: background .2s var(--ease-out), color .2s var(--ease-out);
}
.case-tab:hover { color: var(--text-light); }
.case-tab.active {
  background: linear-gradient(135deg, var(--brand-1), var(--brand-2));
  color: #fff;
  box-shadow: 0 6px 16px rgba(99,102,241,0.3);
}

.case-grid {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}
.case-category-header {
  grid-column: 1 / -1;
  margin: 0 4px 4px;
  font-size: 14px;
  color: var(--text-light-dim);
  display: flex;
  align-items: center;
  gap: 10px;
}
.case-category-header::before {
  content: '';
  flex-grow: 0;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--brand-1), var(--brand-2));
}
.persona-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
  color: #fff;
}
.persona-pill-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: rgba(255,255,255,0.8);
}

.case-card {
  position: relative;
  padding: 24px;
  border-radius: var(--radius-m);
  background: linear-gradient(135deg, rgba(129,140,248,0.05), rgba(99,102,241,0.02));
  border: 1px solid var(--border-light);
  transition: transform .25s var(--ease-out), box-shadow .25s var(--ease-out), border-color .25s var(--ease-out);
  animation: caseFadeUp .5s var(--ease-out) backwards;
}
.case-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.35);
  border-color: rgba(129,140,248,0.4);
}
@keyframes caseFadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

.case-authors {
  display: flex;
  gap: 6px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.case-title {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--text-light);
  letter-spacing: -0.01em;
}
.case-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-light-dim);
  margin: 0 0 18px;
  min-height: 3.4em;
}

/* ---------- 10. Footer ---------- */
.footer {
  background: radial-gradient(ellipse at 50% 0%, #12123a 0%, var(--bg-deep) 100%);
  color: var(--text-light);
  padding: 72px 24px 32px;
  border-top: 1px solid var(--border-light);
}
.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-light);
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.footer-brand img {
  width: 34px;
  height: 34px;
  /* 纯黑 logo 在深色背景上需要反白 */
  filter: invert(1) brightness(1.6);
}
.footer-brand-name { font-weight: 700; font-size: 16px; }
.footer-brand-tag  { font-size: 12px; color: var(--text-light-dim); }
.footer-links {
  display: flex;
  gap: 24px;
}
.footer-link {
  font-size: 14px;
  color: var(--text-light-dim);
  transition: color .2s var(--ease-out);
}
.footer-link:hover { color: var(--brand-1); }
.footer-copy {
  max-width: var(--container);
  margin: 28px auto 0;
  font-size: 12px;
  color: var(--text-light-dim);
  text-align: center;
  letter-spacing: 0.04em;
}

/* ---------- 11. Reveal / Scroll animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .9s var(--ease-out), transform .9s var(--ease-out);
}
.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* Section container fade – each whole section dims until it's in view */
.section {
  opacity: 0.35;
  transition: opacity 1.1s var(--ease-out);
}
.section.in-view {
  opacity: 1;
}
.section-hero { opacity: 1; }  /* 首屏不做整体 dim，立即可见 */

/* Stagger helpers via data-delay */
[data-delay="1"].in-view { transition-delay: .08s; }
[data-delay="2"].in-view { transition-delay: .16s; }
[data-delay="3"].in-view { transition-delay: .24s; }
[data-delay="4"].in-view { transition-delay: .32s; }

@media (prefers-reduced-motion: reduce) {
  .reveal, .section { opacity: 1 !important; transform: none !important; transition: none !important; }
  .scroll-indicator-line::after { animation: none !important; }
}

/* ---------- 12. Audio Player ---------- */
.audio-player {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-light);
  border-radius: 999px;
  transition: background .2s var(--ease-out), border-color .2s var(--ease-out);
}
.audio-player.disabled { opacity: 0.65; cursor: not-allowed; }
.audio-player:hover:not(.disabled) { border-color: rgba(129,140,248,0.5); background: rgba(129,140,248,0.06); }
.audio-player.playing { border-color: var(--brand-1); background: rgba(129,140,248,0.1); }

.audio-btn {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-1), var(--brand-2));
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform .2s var(--ease-out);
}
.audio-btn:hover { transform: scale(1.06); }
.audio-btn svg { width: 14px; height: 14px; fill: currentColor; }
.audio-player.disabled .audio-btn {
  background: rgba(255,255,255,0.08);
  color: var(--text-light-dim);
}

.audio-info {
  flex: 1;
  min-width: 0;
}
.audio-name {
  font-size: 13px;
  color: var(--text-light);
  font-family: 'JetBrains Mono', Consolas, monospace;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 500;
}
.audio-progress {
  height: 3px;
  background: rgba(255,255,255,0.08);
  border-radius: 999px;
  margin-top: 4px;
  overflow: hidden;
}
.audio-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--brand-1), var(--brand-2));
  transition: width .1s linear;
}
.audio-hint {
  font-size: 11px;
  color: var(--text-light-dim);
  letter-spacing: 0.06em;
  flex-shrink: 0;
  margin-left: auto;
}

/* ---------- 13. Responsive ---------- */
@media (max-width: 960px) {
  .nav { padding: 0 20px; }
  .nav-links { display: none; }
  .section { padding: 88px 20px; }
  .intro-grid { grid-template-columns: 1fr; gap: 40px; }
  .metrics-layout { grid-template-columns: 1fr; gap: 32px; }
  .bento-grid { grid-template-columns: 1fr; }
  .bento-card.size-large, .bento-card.size-small { grid-column: span 1; }
  .hero-content { margin-top: -8vh; }
  .timeline { padding-left: 36px; }
  .timeline-dot { left: -32px; }
}
@media (max-width: 560px) {
  .hero-title { font-size: clamp(32px, 9vw, 46px); }
  .hero-title-mono { font-size: 0.55em; }
  .intro-title { font-size: 36px; }
  .section-header { margin-bottom: 44px; }
  .case-grid { grid-template-columns: 1fr; }
  .bento-card { padding: 24px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}