/* ============================================================
   客册 CustomerFollow — 官网共享样式
   遵循 apple-design 规范：光学字距、半透明材质、即时按下反馈、
   空间一致性、reduced-motion / reduced-transparency 无障碍
   ============================================================ */

:root {
  /* 颜色 —— Apple 系统色 */
  --color-text: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-text-tertiary: #86868b;
  --color-bg: #ffffff;
  --color-bg-alt: #f5f5f7;
  --color-bg-elevated: #ffffff;
  --color-primary: #0071e3;
  --color-primary-hover: #0077ed;
  --color-primary-pressed: #006edb;
  --color-success: #34c759;
  --color-warning: #ff9f0a;
  --color-danger: #ff3b30;
  --color-separator: rgba(0, 0, 0, 0.08);
  --color-separator-strong: rgba(0, 0, 0, 0.12);

  /* 半透明材质 */
  --material-nav: rgba(255, 255, 255, 0.72);
  --material-footer: rgba(245, 245, 247, 0.9);
  --material-card: rgba(255, 255, 255, 0.72);

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 24px 80px rgba(0, 0, 0, 0.12), 0 8px 24px rgba(0, 0, 0, 0.06);

  /* 圆角 */
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  /* 间距 */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;
  --space-xxl: 96px;

  /* 字体 —— Apple 字体栈 */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    sans-serif;

  /* 容器宽度 */
  --container-max: 1080px;
  --container-narrow: 720px;
}

/* ----------------------- 基础重置 ----------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  /* iOS Safari 100vh 修正：使用 svh 避免 Dynamic Island 工具栏跳动 */
  scroll-padding-top: 52px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-size: 17px;
  line-height: 1.47059;
  letter-spacing: -0.022em;
  font-weight: 400;
  min-height: 100vh;
  /* 触摸滚动优化：iOS 顺滑、不卡顿 */
  -webkit-overflow-scrolling: touch;
  /* 防止 iOS 双击缩放（已通过 viewport 关闭） */
  touch-action: manipulation;
  /* 字体防抖动 */
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 200ms ease;
}

a:hover {
  text-decoration: underline;
}

/* 光学字距：大标题收紧，正文接近 0（apple-design §15） */
h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.08365;
  letter-spacing: -0.005em;
  color: var(--color-text);
}

h1 { font-size: clamp(40px, 6vw, 72px); letter-spacing: -0.015em; }
h2 { font-size: clamp(32px, 4.5vw, 48px); letter-spacing: -0.012em; }
h3 { font-size: clamp(22px, 3vw, 28px); letter-spacing: -0.008em; }
h4 { font-size: 19px; letter-spacing: -0.006em; }

p { line-height: 1.5; }

/* ----------------------- 容器 ----------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 22px;
}

.container-narrow {
  max-width: var(--container-narrow);
}

.section {
  padding-block: var(--space-xxl);
}

.section-alt {
  background-color: var(--color-bg-alt);
}

.eyebrow {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.012em;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.section-title {
  font-size: clamp(32px, 4.5vw, 48px);
  font-weight: 600;
  letter-spacing: -0.012em;
  line-height: 1.1;
  margin-bottom: var(--space-sm);
}

.section-lead {
  font-size: 19px;
  line-height: 1.45;
  color: var(--color-text-secondary);
  letter-spacing: -0.022em;
  max-width: 60ch;
}

/* ----------------------- 半透明导航栏（apple-design §12） ----------------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--material-nav);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-separator);
  /* iPhone 刘海/Dynamic Island 安全区适配 */
  padding-top: env(safe-area-inset-top);
}

.nav-inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 22px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 19px;
  letter-spacing: -0.012em;
  color: var(--color-text);
}

.brand:hover { text-decoration: none; }

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  display: block;
  object-fit: cover;
  flex-shrink: 0;
  box-shadow: 0 2px 6px rgba(0, 113, 227, 0.18);
}

.brand-sub {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-tertiary);
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  color: var(--color-text);
  font-size: 14px;
  font-weight: 400;
  padding: 8px 12px;
  border-radius: 980px;
  letter-spacing: -0.016em;
}

.nav-links a:hover {
  background: rgba(0, 0, 0, 0.04);
  text-decoration: none;
}

.nav-cta {
  font-weight: 500 !important;
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 980px;
}

.nav-toggle:hover { background: rgba(0, 0, 0, 0.04); }

.nav-toggle svg { width: 22px; height: 22px; display: block; }

/* ----------------------- 按钮（apple-design §1 即时反馈） ----------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 17px;
  font-weight: 400;
  letter-spacing: -0.022em;
  line-height: 1;
  padding: 14px 24px;
  border-radius: 980px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  /* 触摸目标 ≥44px（iOS HIG 最小可点击区域） */
  min-height: 44px;
  transition: transform 100ms ease-out, background-color 200ms ease, color 200ms ease;
  -webkit-tap-highlight-color: transparent;
}

/* 按下即时反馈：触摸即缩放，不等抬起（apple-design §1） */
.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  text-decoration: none;
}

.btn-primary:active {
  background: var(--color-primary-pressed);
}

.btn-secondary {
  background: rgba(0, 0, 0, 0.05);
  color: var(--color-text);
}

.btn-secondary:hover {
  background: rgba(0, 0, 0, 0.08);
  text-decoration: none;
}

.btn-lg {
  font-size: 18px;
  padding: 16px 32px;
}

.btn svg { width: 18px; height: 18px; }

/* ----------------------- Hero ----------------------- */
.hero {
  padding-block: var(--space-xxl) var(--space-xl);
  text-align: center;
  background:
    radial-gradient(120% 80% at 50% 0%, #f0f6ff 0%, rgba(240, 246, 255, 0) 60%),
    var(--color-bg);
}

.hero-eyebrow {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-sm);
}

.hero-title {
  /* 移动端起步 40px，桌面端到 88px：用 min/max/vw 复合计算确保小屏不会过小 */
  font-size: clamp(40px, 11vw, 88px);
  font-weight: 600;
  letter-spacing: -0.018em;
  line-height: 1.05;
  max-width: 18ch;
  margin-inline: auto;
  /* 防止 iOS Safari 横屏时字号被放大 */
  -webkit-text-size-adjust: 100%;
}

.hero-title .accent {
  background: linear-gradient(120deg, #0a84ff, #5e5ce6);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  font-size: clamp(17px, 4.5vw, 24px);
  font-weight: 400;
  line-height: 1.45;
  letter-spacing: -0.014em;
  color: var(--color-text-secondary);
  max-width: 50ch;
  margin: var(--space-md) auto 0;
}

.hero-actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--space-lg);
}

/* App Store 下载按钮 */
.appstore-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: #000;
  color: #fff;
  padding: 12px 22px;
  border-radius: 14px;
  transition: transform 100ms ease-out, background-color 200ms ease;
  -webkit-tap-highlight-color: transparent;
}

.appstore-btn:hover {
  background: #1d1d1f;
  text-decoration: none;
}

.appstore-btn:active {
  transform: scale(0.97);
}

.appstore-btn svg { width: 30px; height: 30px; }

.appstore-btn-text { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.1; }
.appstore-btn-text .small { font-size: 11px; letter-spacing: 0.02em; }
.appstore-btn-text .big { font-size: 19px; font-weight: 500; letter-spacing: -0.01em; }

/* ----------------------- 功能卡片 ----------------------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.feature-card {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
  transition: transform 300ms cubic-bezier(0.22, 1, 0.36, 1), box-shadow 300ms ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  margin-bottom: var(--space-sm);
  color: #fff;
}

.feature-icon svg { width: 26px; height: 26px; }

.fi-blue { background: linear-gradient(135deg, #0a84ff, #0071e3); }
.fi-green { background: linear-gradient(135deg, #30d158, #34c759); }
.fi-orange { background: linear-gradient(135deg, #ff9f0a, #ff7a00); }
.fi-purple { background: linear-gradient(135deg, #5e5ce6, #7c6cff); }
.fi-teal { background: linear-gradient(135deg, #40c8e0, #30b0c7); }
.fi-pink { background: linear-gradient(135deg, #ff375f, #ff2d55); }

.feature-card h3 {
  font-size: 21px;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--color-text-secondary);
  font-size: 16px;
  line-height: 1.45;
}

/* ----------------------- 截图展示 ----------------------- */
.shots-head {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.shots-grid {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  align-items: flex-start;
}

.shot {
  flex: 0 1 260px;
  min-width: 200px;
}

.shot-frame {
  background: #1d1d1f;
  border-radius: 36px;
  padding: 10px;
  box-shadow: var(--shadow-xl);
  transition: transform 400ms cubic-bezier(0.22, 1, 0.36, 1);
  /* 移动端防止圆角溢出父容器 */
  overflow: hidden;
}

.shot:hover .shot-frame {
  transform: scale(1.02) translateY(-6px);
}

.shot-frame img {
  border-radius: 28px;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 19.5;
  object-fit: cover;
  background: var(--color-bg-alt);
}

.shot-caption {
  text-align: center;
  margin-top: var(--space-sm);
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-secondary);
  letter-spacing: -0.016em;
}

/* 单张大幅展示（用于详情页 hero 等） */
.shot-large {
  max-width: 340px;
  margin-inline: auto;
}

/* ----------------------- 统计条 ----------------------- */
.stats-band {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-md);
  text-align: center;
}

.stat-num {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 600;
  letter-spacing: -0.02em;
  background: linear-gradient(120deg, #0a84ff, #5e5ce6);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-top: 6px;
  letter-spacing: -0.016em;
}

/* ----------------------- 法律文档页 ----------------------- */
.legal {
  padding-block: var(--space-xl) var(--space-xxl);
}

.legal-header {
  padding-block: var(--space-xl) var(--space-lg);
  background:
    radial-gradient(100% 60% at 50% 0%, #f0f6ff 0%, rgba(240, 246, 255, 0) 70%),
    var(--color-bg);
}

.legal-header .container { text-align: center; }

.legal-title {
  font-size: clamp(36px, 5vw, 56px);
  letter-spacing: -0.015em;
}

.legal-meta {
  margin-top: var(--space-sm);
  color: var(--color-text-tertiary);
  font-size: 15px;
}

.legal-body {
  max-width: var(--container-narrow);
  margin-inline: auto;
}

.legal-body h2 {
  font-size: 24px;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.01em;
}

.legal-body h2:first-child { margin-top: 0; }

.legal-body h3 {
  font-size: 19px;
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

.legal-body p,
.legal-body li {
  color: var(--color-text-secondary);
  line-height: 1.65;
  font-size: 16px;
}

.legal-body p { margin-bottom: var(--space-sm); }

.legal-body ul,
.legal-body ol {
  margin: 0 0 var(--space-sm) var(--space-sm);
  padding-left: var(--space-sm);
}

.legal-body li { margin-bottom: 6px; }

.legal-body strong { color: var(--color-text); font-weight: 600; }

.legal-body a { font-weight: 500; }

.legal-toc {
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  margin-bottom: var(--space-lg);
}

.legal-toc h2 {
  font-size: 17px;
  margin: 0 0 var(--space-xs);
  color: var(--color-text);
}

.legal-toc ol {
  margin: 0;
  padding-left: var(--space-sm);
}

.legal-toc a { font-size: 15px; }

.callout {
  background: var(--color-bg-alt);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: var(--space-sm) var(--space-md);
  margin: var(--space-md) 0;
}

.callout p { margin: 0; color: var(--color-text); }

/* ----------------------- 技术支持页 ----------------------- */
.support-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.support-card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-separator);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  transition: box-shadow 200ms ease, transform 200ms ease;
}

.support-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.support-card h3 {
  font-size: 19px;
  margin-bottom: 8px;
}

.support-card p { color: var(--color-text-secondary); font-size: 15px; line-height: 1.5; }

.support-card .icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(0, 113, 227, 0.1);
  display: grid;
  place-items: center;
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
}

.support-card .icon-wrap svg { width: 24px; height: 24px; }

.faq-list { max-width: var(--container-narrow); margin-inline: auto; margin-top: var(--space-lg); }

.faq-item {
  border-bottom: 1px solid var(--color-separator);
  padding: var(--space-sm) 0;
}

.faq-item summary {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.012em;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  padding: 4px 0;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "";
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236e6e73' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E") center/contain no-repeat;
  transition: transform 300ms cubic-bezier(0.22, 1, 0.36, 1);
}

.faq-item[open] summary::after { transform: rotate(180deg); }

.faq-answer {
  padding: var(--space-sm) 0 4px;
  color: var(--color-text-secondary);
  font-size: 16px;
  line-height: 1.6;
}

/* ----------------------- Footer ----------------------- */
.footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-separator);
  padding-block: var(--space-lg);
  /* iPhone Home Indicator 安全区适配 */
  padding-bottom: calc(var(--space-lg) + env(safe-area-inset-bottom));
  font-size: 14px;
  color: var(--color-text-tertiary);
}

.footer-inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 22px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  text-align: center;
}

.footer-brand { max-width: 320px; }

.footer-brand .brand { margin-bottom: var(--space-xs); }

.footer-brand p { font-size: 13px; line-height: 1.5; }

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--color-text-secondary);
  font-size: 14px;
}

.footer-links a:hover { color: var(--color-text); }

.footer-bottom {
  width: 100%;
  margin: var(--space-md) auto 0;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-separator);
  text-align: center;
  font-size: 12px;
}

.footer-bottom span {
  display: block;
  width: 100%;
  text-align: center;
}

/* ----------------------- 通用工具 ----------------------- */
.text-center { text-align: center; }
.mt-lg { margin-top: var(--space-lg); }
.mb-0 { margin-bottom: 0; }

/* 进入动画：温和淡入上移，克制（apple-design §14 减少动效时关闭） */
@keyframes rise {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  animation: rise 700ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.reveal-d1 { animation-delay: 80ms; }
.reveal-d2 { animation-delay: 160ms; }
.reveal-d3 { animation-delay: 240ms; }
.reveal-d4 { animation-delay: 320ms; }

/* ----------------------- 无障碍：减少动效（apple-design §14） ----------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { animation: none; opacity: 1; transform: none; }
  .btn:active,
  .appstore-btn:active { transform: none; }
  .shot:hover .shot-frame { transform: none; }
}

/* 无障碍：减少透明度时材质变实底（apple-design §14） */
@media (prefers-reduced-transparency: reduce) {
  .nav { background: #fff; -webkit-backdrop-filter: none; backdrop-filter: none; }
  .footer { background: #f0f0f2; }
}

/* 提升对比度 */
@media (prefers-contrast: more) {
  :root {
    --color-text-secondary: #1d1d1f;
    --color-text-tertiary: #424245;
    --color-separator: rgba(0, 0, 0, 0.2);
  }
  .nav { border-bottom: 1px solid rgba(0, 0, 0, 0.25); }
}

/* ----------------------- 响应式 ----------------------- */

/* 平板及以下：抽屉式菜单 */
@media (max-width: 832px) {
  .nav-links {
    position: fixed;
    /* 留出 Dynamic Island 安全区 + 导航栏高度 */
    top: calc(52px + env(safe-area-inset-top));
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    /* 移动端菜单使用实色底，避免页面内容透出影响阅读。 */
    background: #fff;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    padding: var(--space-xs) 22px var(--space-sm);
    border-bottom: 1px solid var(--color-separator);
    transform: translateY(-120%);
    transition: transform 400ms cubic-bezier(0.22, 1, 0.36, 1);
    z-index: 99;
  }

  .nav-links.open { transform: translateY(0); }

  /* 移动端菜单项触摸目标加大到 48px */
  .nav-links a {
    padding: 14px 12px;
    border-radius: var(--radius-sm);
    min-height: 48px;
    display: flex;
    align-items: center;
  }

  .nav-toggle { display: inline-flex; }

  .footer-inner { text-align: center; }
}

/* 手机：截图垂直堆叠、按钮全宽、统计条 2 列 */
@media (max-width: 600px) {
  /* 截图垂直堆叠 */
  .shots-grid {
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
  }
  .shot {
    flex-basis: auto;
    max-width: 240px;
    width: 100%;
  }
  /* 设备框 padding 收紧，圆角缩小适配小屏 */
  .shot-frame {
    border-radius: 28px;
    padding: 8px;
  }
  .shot-frame img {
    border-radius: 22px;
  }

  /* Hero 按钮组改为垂直堆叠 + 全宽 */
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-sm);
  }
  .hero-actions .btn,
  .hero-actions .appstore-btn {
    width: 100%;
    justify-content: center;
  }

  /* 统计条 2x2 网格，数字字号收紧 */
  .stats-band {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md) var(--space-sm);
  }
  .stat-num {
    font-size: clamp(32px, 9vw, 44px);
  }

  /* 功能卡片单列、padding 收紧 */
  .feature-grid {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }
  .feature-card {
    padding: var(--space-sm) var(--space-md);
  }

  /* section 间距收紧 */
  :root {
    --space-xxl: 56px;
    --space-xl: 36px;
    --space-lg: 28px;
  }

  /* 容器左右 padding 收紧到 16px */
  .container,
  .nav-inner,
  .footer-inner,
  .footer-bottom {
    padding-inline: 16px;
  }

  /* 法律文档阅读优化：更大行高、左右更宽阅读感 */
  .legal-body p,
  .legal-body li {
    font-size: 15.5px;
    line-height: 1.7;
  }
  .legal-body h2 { font-size: 22px; }
  .legal-body h3 { font-size: 18px; }
  .legal-body ul,
  .legal-body ol {
    padding-left: 20px;
  }

  /* footer 底部改为垂直堆叠 */
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  /* 支持卡片单列 */
  .support-grid {
    grid-template-columns: 1fr;
  }

  /* FAQ 标题字号收紧 */
  .faq-item summary {
    font-size: 16px;
    line-height: 1.35;
  }
  .faq-answer {
    font-size: 15px;
    line-height: 1.65;
  }
}

/* 超小屏（iPhone SE 375px 及更小） */
@media (max-width: 380px) {
  .hero-title {
    font-size: 36px;
  }
  .hero-sub {
    font-size: 16px;
  }
  /* App Store 下载按钮字号微调 */
  .appstore-btn-text .big {
    font-size: 17px;
  }
  .appstore-btn {
    padding: 10px 18px;
  }
}

/* 横屏手机：Hero 高度优化，避免内容溢出 */
@media (max-width: 832px) and (orientation: landscape) and (max-height: 450px) {
  .hero {
    padding-block: var(--space-md) var(--space-sm);
  }
  .hero-actions {
    margin-top: var(--space-sm);
  }
}

/* 大屏：限制截图最大宽度，避免拉伸过大 */
@media (min-width: 1080px) {
  .shots-grid {
    max-width: 900px;
    margin-inline: auto;
  }
}