/* ==========================================================================
   羽言 YuyanSpeak 官网 — 全站设计系统（"声波脉冲"科技风）
   唯一全站样式表，零外部依赖（无外部字体 / CDN / 框架）
   ========================================================================== */

/* --------------------------------------------------------------------------
   0. 设计令牌
   -------------------------------------------------------------------------- */
:root {
  --bg-deep: #04070f;
  --bg-panel: rgba(10, 22, 44, .6);
  --bg-panel-solid: #0a162c; /* 卡片等效纯色（免 backdrop-filter，低端安卓性能） */
  --accent: #39d5ff;        /* 青色高光 */
  --accent-2: #2f6bff;      /* 渐变蓝 */
  --warm: #ffb86b;          /* 人文暖橙点缀 */
  --text-main: #eaf4ff;
  --text-dim: #9db8dd;
  --border-glow: rgba(90, 170, 255, .25);
  --radius: 14px;
  --max-w: 1200px;

  --font-zh: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --font-mono: Consolas, "Courier New", monospace;
}

/* --------------------------------------------------------------------------
   1. Reset + 基础
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px; /* 固定导航锚点偏移，防止标题被 68px header 遮挡 */
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg-deep);
  color: var(--text-main);
  font-family: var(--font-zh);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color .25s ease;
}

a:hover {
  color: #7ce6ff;
}

h1, h2, h3, h4 {
  line-height: 1.25;
  font-weight: 700;
  color: var(--text-main);
}

p {
  color: var(--text-dim);
}

ul, ol {
  padding-left: 1.4em;
}

::selection {
  background: rgba(57, 213, 255, .28);
  color: #fff;
}

/* 无障碍：所有可聚焦元素的可见焦点（硬性要求）。
   仅对支持 :focus-visible 的浏览器隐藏鼠标焦点框，
   不支持的旧 WebView 保留默认 outline，键盘焦点仍可见。 */
:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 跳转链接（无障碍） */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 10px 18px;
  background: var(--accent-2);
  color: #fff;
  border-radius: 0 0 8px 0;
  font-size: 14px;
}

.skip-link:focus-visible {
  left: 0;
}

/* --------------------------------------------------------------------------
   2. 布局
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
}

.section-title {
  font-size: 34px;
  font-weight: 800;
  margin: 14px 0 16px;
}

.section-lead {
  max-width: 640px;
  font-size: 17px;
}

.section-head {
  margin-bottom: 48px;
}

.section-head.center {
  text-align: center;
}

.section-head.center .section-lead {
  margin-left: auto;
  margin-right: auto;
}

/* --------------------------------------------------------------------------
   3. 导航 .site-header
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(4, 8, 18, .72);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-glow);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-main);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: .5px;
  white-space: nowrap;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.brand:hover {
  color: var(--text-main);
}

.brand .brand-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 1px;
  font-weight: 400;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.site-nav a {
  color: var(--text-dim);
  font-size: 15px;
  transition: color .25s ease;
}

.site-nav a:hover {
  color: var(--text-main);
}

.site-nav a[aria-current="page"] {
  color: var(--accent);
  font-weight: 600;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 9px 22px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  color: #fff !important;
  font-weight: 600;
  font-size: 14px;
  box-shadow: 0 0 18px rgba(57, 213, 255, .35);
  transition: transform .25s ease, box-shadow .25s ease;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 26px rgba(57, 213, 255, .5);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px; /* 触控目标 ≥ 44×44px */
  background: transparent;
  border: 1px solid var(--border-glow);
  border-radius: 10px;
  cursor: pointer;
  position: relative;
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  transition: transform .3s ease, opacity .3s ease;
}

.nav-toggle span {
  top: 50%;
  transform: translate(-50%, -50%);
}

.nav-toggle span::before {
  top: -6px;
}

.nav-toggle span::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] span {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] span::before {
  transform: translateX(-50%) translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span::after {
  transform: translateX(-50%) translateY(-6px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   4. 首屏 .hero
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh; /* svh 兜底移动端 URL 栏收起导致的高度跳动 */
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding: 120px 0 80px;
  background:
    radial-gradient(ellipse 60% 45% at 75% 30%, rgba(0, 180, 255, .16), transparent 70%),
    radial-gradient(ellipse 55% 45% at 18% 82%, rgba(60, 80, 255, .14), transparent 70%),
    var(--bg-deep);
}

/* 44px 网格底纹，radial mask 从中心淡出 */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(80, 160, 255, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(80, 160, 255, .06) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 45%, #000 0%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 60% at 50% 45%, #000 0%, transparent 75%);
  pointer-events: none;
}

/* HUD 角标：左上 / 右下 18px L 形描边 */
.hero::after {
  content: "";
  position: absolute;
  inset: 28px;
  pointer-events: none;
  background:
    linear-gradient(rgba(120, 200, 255, .5), rgba(120, 200, 255, .5)) left top / 18px 1px,
    linear-gradient(rgba(120, 200, 255, .5), rgba(120, 200, 255, .5)) left top / 1px 18px,
    linear-gradient(rgba(120, 200, 255, .5), rgba(120, 200, 255, .5)) right bottom / 18px 1px,
    linear-gradient(rgba(120, 200, 255, .5), rgba(120, 200, 255, .5)) right bottom / 1px 18px;
  background-repeat: no-repeat;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 860px;
}

.hero h1 {
  font-size: 56px;
  font-weight: 800;
  letter-spacing: 1px;
  margin: 22px 0 20px;
}

.hero h1 .grad {
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero .hero-lead {
  font-size: 18px;
  max-width: 620px;
  margin: 0 auto 36px;
}

.hero .btn-row {
  justify-content: center;
}

/* --------------------------------------------------------------------------
   5. 声波动效 .waveband
   -------------------------------------------------------------------------- */
.waveband {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  height: 56px;
  margin: 0 auto;
}

.waveband span {
  display: block;
  width: 4px;
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(180deg, #39d5ff, #2f6bff);
  box-shadow: 0 0 12px rgba(57, 213, 255, .55);
  transform-origin: center;
  animation: pulse 1.6s ease-in-out infinite;
}

.waveband span:nth-child(1)  { height: 30%; animation-delay: 0s; }
.waveband span:nth-child(2)  { height: 52%; animation-delay: .1s; }
.waveband span:nth-child(3)  { height: 78%; animation-delay: .2s; }
.waveband span:nth-child(4)  { height: 100%; animation-delay: .3s; }
.waveband span:nth-child(5)  { height: 72%; animation-delay: .4s; }
.waveband span:nth-child(6)  { height: 92%; animation-delay: .5s; }
.waveband span:nth-child(7)  { height: 60%; animation-delay: .6s; }
.waveband span:nth-child(8)  { height: 84%; animation-delay: .7s; }
.waveband span:nth-child(9)  { height: 46%; animation-delay: .8s; }
.waveband span:nth-child(10) { height: 66%; animation-delay: .9s; }
.waveband span:nth-child(11) { height: 38%; animation-delay: 1s; }
.waveband span:nth-child(12) { height: 56%; animation-delay: 1.1s; }

@keyframes pulse {
  0%, 100% { transform: scaleY(.5); opacity: .6; }
  50%      { transform: scaleY(1);  opacity: 1; }
}

/* --------------------------------------------------------------------------
   6. 组件
   -------------------------------------------------------------------------- */

/* 6.1 玻璃拟态卡片（纯色背景上用等效纯色面板，免 backdrop-filter 保性能） */
.glass-card {
  background: var(--bg-panel-solid);
  border: 1px solid var(--border-glow);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, .06),
    0 18px 48px rgba(2, 8, 24, .55);
  border-radius: var(--radius);
  padding: 28px;
}

/* 6.2 按钮 */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 34px;
  border: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  color: #fff;
  font-family: var(--font-zh);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 0 22px rgba(57, 213, 255, .38);
  transition: transform .25s ease, box-shadow .25s ease;
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 34px rgba(57, 213, 255, .55);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 32px;
  border: 1px solid var(--border-glow);
  border-radius: 999px;
  background: transparent;
  color: #a8d8ff;
  font-family: var(--font-zh);
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: background .25s ease, border-color .25s ease, color .25s ease;
}

.btn-ghost:hover {
  background: rgba(57, 213, 255, .08);
  border-color: rgba(90, 170, 255, .5);
  color: #d2ecff;
}

/* "未开放" 按钮：虚线描边、暗色文字、无 hover 高亮 */
.btn-ios {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 32px;
  border: 1px dashed rgba(140, 180, 255, .4);
  border-radius: 999px;
  background: transparent;
  color: #7f97c4;
  font-family: var(--font-zh);
  font-size: 16px;
  cursor: default;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

/* 6.3 等宽标签 .eyebrow / .kicker */
.eyebrow,
.kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
}

.kicker-warm {
  color: var(--warm);
}

/* 6.4 特性网格 .feature-grid / .feature-card */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.feature-card {
  background: var(--bg-panel-solid);
  border: 1px solid var(--border-glow);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, .06),
    0 18px 48px rgba(2, 8, 24, .55);
  border-radius: var(--radius);
  padding: 26px;
  transition: transform .3s ease, border-color .3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(90, 170, 255, .5);
}

.feature-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14.5px;
}

/* 6.5 步骤卡 .steps */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  counter-reset: step;
}

.step-card {
  background: var(--bg-panel-solid);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius);
  padding: 28px;
}

.step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 14px;
  text-shadow: 0 0 18px rgba(57, 213, 255, .45);
}

.step-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 14.5px;
}

/* 6.6 暖橙故事条 .story-band */
.story-band {
  border-left: 3px solid var(--warm);
  background: linear-gradient(90deg, rgba(255, 154, 61, .08), transparent 60%);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 30px 34px;
}

.story-band blockquote {
  font-size: 18px;
  font-style: italic;
  color: #ffd9a8;
  line-height: 1.8;
}

.story-band .story-by {
  margin-top: 14px;
  font-size: 13px;
  color: var(--text-dim);
}

/* 6.7 媒体徽章墙 .media-wall */
.media-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.media-badge {
  display: inline-flex;
  align-items: center;
  padding: 7px 16px;
  border: 1px solid var(--border-glow);
  border-radius: 6px;
  font-size: 13.5px;
  color: var(--text-dim);
  transition: border-color .25s ease, color .25s ease;
}

.media-badge:hover {
  border-color: rgba(90, 170, 255, .6);
  color: var(--text-main);
}

/* 6.8 定价 .price-band / .price-card */
.price-band {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

.price-card {
  background: var(--bg-panel-solid);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius);
  padding: 30px;
  text-align: center;
}

.price-card .price-name {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-dim);
}

.price-card .price-num {
  font-size: 44px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.1;
  margin: 12px 0 4px;
  text-shadow: 0 0 24px rgba(57, 213, 255, .4);
}

.price-card .price-unit {
  font-size: 14px;
  color: var(--text-dim);
}

.price-card ul {
  list-style: none;
  padding: 0;
  margin: 20px 0 0;
  text-align: left;
}

.price-card ul li {
  padding: 7px 0 7px 24px;
  position: relative;
  font-size: 14.5px;
  color: var(--text-dim);
  border-top: 1px solid rgba(90, 170, 255, .12);
}

.price-card ul li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 14px;
  width: 10px;
  height: 6px;
  border-left: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(-45deg);
}

/* 6.9 截图展示 .shot-frame / .shot-row */
.shot-row {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 28px;
  flex-wrap: wrap;
}

.shot-frame {
  flex: 0 0 auto;
}

.shot-frame img {
  width: 280px;
  border-radius: 24px;
  border: 1px solid var(--border-glow);
  box-shadow: 0 24px 60px rgba(47, 107, 255, .25);
}

.shot-frame figcaption {
  margin-top: 14px;
  text-align: center;
  font-size: 13.5px;
  color: var(--text-dim);
}

/* 6.10 左右分栏 .split / .split-reverse */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.split-reverse > :first-child {
  order: 2;
}

.split-reverse > :last-child {
  order: 1;
}

.split h2 {
  font-size: 30px;
  margin: 12px 0 16px;
}

.split p + p {
  margin-top: 12px;
}

/* 6.11 底部 CTA .final-cta */
.final-cta {
  position: relative;
  text-align: center;
  padding: 110px 0;
  overflow: hidden;
  background:
    radial-gradient(ellipse 60% 55% at 50% 100%, rgba(47, 107, 255, .22), transparent 70%),
    var(--bg-deep);
}

.final-cta h2 {
  font-size: 38px;
  font-weight: 800;
  margin-bottom: 16px;
}

.final-cta p {
  max-width: 560px;
  margin: 0 auto 34px;
}

.final-cta .btn-row {
  justify-content: center;
}

/* 6.12 合规页 .legal */
.legal {
  max-width: 760px;
  margin: 0 auto;
  line-height: 1.9;
}

.legal h2 {
  font-size: 24px;
  margin: 44px 0 14px;
  padding-top: 8px;
}

.legal h3 {
  font-size: 18px;
  margin: 28px 0 10px;
}

.legal p {
  margin-bottom: 14px;
}

.legal ul,
.legal ol {
  margin: 0 0 16px;
  padding-left: 1.6em;
}

.legal li {
  margin-bottom: 8px;
  color: var(--text-dim);
}

.legal li::marker {
  color: var(--accent);
}

.legal a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 6.13 子页小 hero .page-hero */
.page-hero {
  position: relative;
  padding: 170px 0 80px;
  text-align: center;
  background:
    radial-gradient(ellipse 55% 50% at 50% 0%, rgba(0, 180, 255, .12), transparent 70%),
    var(--bg-deep);
}

.page-hero h1 {
  font-size: 40px;
  font-weight: 800;
  margin: 16px 0 14px;
}

.page-hero p {
  max-width: 620px;
  margin: 0 auto;
  font-size: 17px;
}

/* 标题下方细分割线光晕 */
.page-hero::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: min(720px, 80%);
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(57, 213, 255, .5), transparent);
  box-shadow: 0 0 18px rgba(57, 213, 255, .35);
}

/* --------------------------------------------------------------------------
   7. 滚动入场 .reveal
   仅在 JS 就绪（<html class="js">，由脚本首行添加）后才隐藏元素，
   JS 加载失败时内容始终可见，无 "白屏" 风险。
   -------------------------------------------------------------------------- */
html.js .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s ease, transform .7s ease;
}

html.js .reveal.visible {
  opacity: 1;
  transform: none;
}

/* --------------------------------------------------------------------------
   8. 页脚 .site-footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: #02040a;
  border-top: 1px solid var(--border-glow);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}

.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 18px;
  font-weight: 600;
}

.footer-col ul {
  list-style: none;
  padding: 0;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: var(--text-dim);
  font-size: 14.5px;
}

.footer-col a:hover {
  color: var(--accent);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  color: var(--text-main);
  font-weight: 700;
}

.footer-brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.footer-col p {
  font-size: 14px;
  max-width: 340px;
}

.copyright {
  border-top: 1px solid rgba(90, 170, 255, .12);
  padding: 22px 0;
  text-align: center;
  font-size: 13px;
  color: rgba(157, 184, 221, .75);
}

.copyright a {
  color: rgba(157, 184, 221, .75);
}

/* --------------------------------------------------------------------------
   9. 响应式
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero h1 {
    font-size: 44px;
  }

  .split {
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }

  /* 导航：汉堡模式 */
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(4, 8, 18, .96);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-glow);
    padding: 12px 24px 20px;
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    padding: 13px 4px;
    font-size: 16px;
    border-bottom: 1px solid rgba(90, 170, 255, .1);
  }

  .site-nav .nav-cta {
    margin-top: 14px;
    justify-content: center;
    border-bottom: 0;
  }

  /* Hero */
  .hero h1 {
    font-size: 34px;
  }

  .hero .hero-lead {
    font-size: 16px;
  }

  .hero::after {
    inset: 16px;
  }

  .section-title {
    font-size: 27px;
  }

  /* 网格全部单列 */
  .feature-grid,
  .steps,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  /* 分栏纵向 */
  .split {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .split-reverse > :first-child {
    order: 0;
  }

  .split-reverse > :last-child {
    order: 0;
  }

  /* 截图横排：横向滑动 + scroll-snap */
  .shot-row {
    flex-wrap: nowrap;
    justify-content: flex-start;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding: 8px 24px 32px;
    margin: 0 -24px;
  }

  .shot-frame {
    scroll-snap-align: center;
  }

  .page-hero {
    padding: 140px 0 60px;
  }

  .page-hero h1 {
    font-size: 30px;
  }

  .final-cta {
    padding: 80px 0;
  }

  .final-cta h2 {
    font-size: 28px;
  }

  .btn-row {
    justify-content: center;
  }
}

/* --------------------------------------------------------------------------
   10. 无障碍：减弱动效
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  html.js .reveal {
    opacity: 1;
    transform: none;
  }
}

/* --------------------------------------------------------------------------
   11. 工具类：视觉隐藏（屏幕阅读器可读，视觉不可见）
   -------------------------------------------------------------------------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}