/**
 * 理理 - App 官网与隐私协议样式表
 * 现代化响应式设计 · 支持深浅色模式 · iOS 风格玻璃拟态与流体排版
 */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", Menlo, Monaco, Consolas, "Courier New", monospace;

  /* 基础色彩体系 (默认深色模式 - 深邃科技感) */
  --bg-primary: #0a0c10;
  --bg-secondary: #12161f;
  --bg-tertiary: #1a202c;
  --bg-card: rgba(24, 29, 41, 0.7);
  --bg-card-hover: rgba(32, 38, 54, 0.85);
  --bg-glass: rgba(10, 12, 16, 0.75);
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-hover: rgba(255, 255, 255, 0.18);
  --border-highlight: rgba(99, 102, 241, 0.4);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0a0c10;

  /* 品牌与点缀色 */
  --brand-primary: #6366f1;
  --brand-primary-hover: #4f46e5;
  --brand-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
  --brand-cyan: #06b6d4;
  --brand-emerald: #10b981;
  --brand-amber: #f59e0b;
  --brand-rose: #f43f5e;

  /* 阴影体系 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 12px -1px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 30px -4px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 35px rgba(99, 102, 241, 0.25);

  /* 布局与圆角 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  --max-width: 1200px;
  --nav-height: 72px;
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 浅色主题模式 */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-tertiary: #e2e8f0;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-glass: rgba(248, 250, 252, 0.82);

  --border-color: rgba(0, 0, 0, 0.08);
  --border-color-hover: rgba(0, 0, 0, 0.16);
  --border-highlight: rgba(99, 102, 241, 0.3);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;

  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 14px -2px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 36px -6px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.18);
}

/* 重置与通用规范 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 24px);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.15) 0%, transparent 60%),
    radial-gradient(circle at 100% 30%, rgba(6, 182, 212, 0.08) 0%, transparent 50%);
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 顶部导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.site-header.scrolled {
  box-shadow: var(--shadow-sm);
  border-bottom-color: var(--border-color-hover);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.brand-name {
  color: var(--text-primary);
}

.brand-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.16);
  color: #818cf8;
  border: 1px solid rgba(99, 102, 241, 0.3);
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-color-hover);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--brand-primary);
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  box-shadow: 0 2px 10px rgba(99, 102, 241, 0.35);
  transition: all var(--transition-fast);
}

.btn-primary:hover {
  background: var(--brand-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.45);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-color-hover);
  transform: translateY(-1px);
}

.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 1.25rem;
}

/* 响应式抽屉导航 (移动端) */
.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--nav-height));
  background: var(--bg-primary);
  padding: 24px;
  z-index: 99;
  flex-direction: column;
  gap: 20px;
  border-top: 1px solid var(--border-color);
  transform: translateY(-10px);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-fast);
}

.mobile-nav-drawer.open {
  display: flex;
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.mobile-nav-links a {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.mobile-nav-links a:hover {
  color: var(--text-primary);
}

/* Hero 首屏展示区 */
.hero-section {
  padding: 70px 0 90px;
  position: relative;
  overflow: hidden;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 60px;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  align-self: flex-start;
  padding: 6px 14px;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: #a5b4fc;
}

.pill-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand-cyan);
  box-shadow: 0 0 8px var(--brand-cyan);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.035em;
  color: var(--text-primary);
}

.gradient-text {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 12px;
}

.hero-cta-group .btn-primary {
  padding: 13px 26px;
  font-size: 1.05rem;
}

.hero-cta-group .btn-secondary {
  padding: 13px 24px;
  font-size: 1.05rem;
}

.hero-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.stat-item h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 拟真 iPhone 界面 Mockup (纯 CSS 原生质感) */
.hero-mockup-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
  perspective: 1200px;
}

.mockup-glow {
  position: absolute;
  width: 320px;
  height: 480px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.35) 0%, rgba(6, 182, 212, 0.15) 50%, transparent 75%);
  filter: blur(50px);
  z-index: 0;
  pointer-events: none;
}

.iphone-frame {
  position: relative;
  z-index: 1;
  width: 320px;
  background: #000000;
  border: 10px solid #1f242e;
  border-radius: 46px;
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255, 255, 255, 0.12);
  overflow: hidden;
  transform: rotateY(-4deg) rotateX(2deg);
  transition: transform var(--transition-normal);
}

.iphone-frame:hover {
  transform: rotateY(0deg) rotateX(0deg) translateY(-4px);
}

.iphone-notch {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  width: 90px;
  height: 24px;
  background: #000;
  border-radius: 20px;
  z-index: 20;
}

.phone-screen {
  background: #0d1117;
  color: #fff;
  padding: 44px 14px 16px;
  font-size: 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 580px;
}

.phone-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.phone-header-title {
  font-weight: 700;
  font-size: 0.95rem;
}

.agent-wave-indicator {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 3px 8px;
  background: rgba(99, 102, 241, 0.2);
  border-radius: 20px;
  font-size: 0.65rem;
  color: #a5b4fc;
}

.wave-bar {
  width: 2.5px;
  height: 10px;
  background: #818cf8;
  border-radius: 2px;
  animation: waveAnim 1s ease-in-out infinite alternate;
}

.wave-bar:nth-child(2) { animation-delay: 0.2s; height: 14px; }
.wave-bar:nth-child(3) { animation-delay: 0.4s; height: 8px; }
.wave-bar:nth-child(4) { animation-delay: 0.1s; height: 12px; }

@keyframes waveAnim {
  0% { transform: scaleY(0.4); }
  100% { transform: scaleY(1); }
}

.chat-bubble {
  padding: 10px 12px;
  border-radius: 14px;
  line-height: 1.45;
  font-size: 0.8rem;
}

.chat-bubble.user {
  align-self: flex-end;
  background: #4f46e5;
  color: #fff;
  border-bottom-right-radius: 4px;
  max-width: 85%;
}

.chat-bubble.agent {
  align-self: flex-start;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom-left-radius: 4px;
  max-width: 95%;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* 拟真 Intelligent UI 动态原生卡片 */
.intelligent-card {
  background: rgba(20, 24, 33, 0.85);
  border: 1px solid rgba(99, 102, 241, 0.35);
  border-radius: 10px;
  padding: 10px;
  margin-top: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.card-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  font-size: 0.76rem;
  color: #c7d2fe;
  margin-bottom: 8px;
}

.timeline-mini {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.timeline-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  color: #94a3b8;
}

.timeline-time {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: #38bdf8;
  width: 44px;
}

.timeline-text {
  color: #e2e8f0;
}

.status-badge-mini {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.65rem;
  padding: 3px 6px;
  border-radius: 4px;
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
  margin-top: 4px;
}

/* 核心特性区 (Bento Grid) */
.section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 56px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.section-tag {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #818cf8;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.6rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.bento-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

.bento-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.bento-card.col-8 {
  grid-column: span 8;
}

.bento-card.col-4 {
  grid-column: span 4;
}

.bento-card.col-6 {
  grid-column: span 6;
}

.bento-card.col-12 {
  grid-column: span 12;
}

.card-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.15);
  color: #818cf8;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  border: 1px solid rgba(99, 102, 241, 0.25);
}

.card-content h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.card-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* 视觉化功能卡内嵌预览 */
.card-preview {
  margin-top: 24px;
  padding: 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.code-pill {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  color: #38bdf8;
}

/* 深度剖析区 (Feature Deep Dive) */
.deepdive-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 56px;
  margin-bottom: 80px;
}

.deepdive-grid.reverse {
  direction: rtl;
}

.deepdive-grid.reverse > * {
  direction: ltr;
}

.deepdive-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.deepdive-content h3 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 8px;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 0.98rem;
}

.feature-list-icon {
  color: var(--brand-emerald);
  margin-top: 4px;
  flex-shrink: 0;
}

.deepdive-visual {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--shadow-md);
  position: relative;
}

/* 交互卡片示例 */
.ui-demo-widget {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color-hover);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.calc-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
}

.calc-val {
  font-family: var(--font-mono);
  font-weight: 700;
  color: #38bdf8;
}

/* 隐私安全保证徽章墙 */
.privacy-badge-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 36px;
}

.privacy-badge-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.privacy-badge-card .badge-icon {
  font-size: 2rem;
  color: var(--brand-emerald);
}

.privacy-badge-card h4 {
  font-size: 1.05rem;
  color: var(--text-primary);
}

.privacy-badge-card p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* 常见问题 (FAQ 手风琴) */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--border-color-hover);
}

.faq-question {
  width: 100%;
  padding: 22px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--text-primary);
  background: none;
}

.faq-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
  color: var(--text-secondary);
}

.faq-item.open .faq-icon {
  transform: rotate(180deg);
  color: var(--brand-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out, padding 0.35s ease-out;
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
}

.faq-item.open .faq-answer {
  max-height: 300px;
  padding-bottom: 22px;
}

/* 底部 CTA 区域 */
.cta-banner {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(6, 182, 212, 0.15) 100%);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  text-align: center;
  margin: 40px auto;
  position: relative;
  overflow: hidden;
}

.cta-banner h2 {
  font-size: clamp(2rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.cta-banner p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 28px;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* 页脚 Footer */
.site-footer {
  margin-top: auto;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 60px 0 36px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-brand p {
  color: var(--text-muted);
  max-width: 320px;
  font-size: 0.88rem;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  color: var(--text-secondary);
  font-size: 0.88rem;
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  font-size: 0.82rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 12px;
}

/* 隐私政策专门样式 (Privacy Policy) */
.privacy-header {
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.privacy-header .badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.privacy-header h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  margin-bottom: 10px;
}

.privacy-header-meta {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.privacy-body-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  padding: 48px 0 80px;
}

.privacy-toc {
  position: sticky;
  top: calc(var(--nav-height) + 24px);
  height: fit-content;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
}

.privacy-toc h4 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}

.privacy-toc ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.86rem;
}

.privacy-toc a {
  color: var(--text-secondary);
  display: block;
  padding: 4px 0;
  border-left: 2px solid transparent;
  padding-left: 8px;
}

.privacy-toc a:hover, .privacy-toc a.active {
  color: var(--brand-primary);
  border-left-color: var(--brand-primary);
  font-weight: 600;
}

.privacy-content {
  display: flex;
  flex-direction: column;
  gap: 36px;
  color: var(--text-secondary);
  line-height: 1.75;
}

.privacy-content section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.privacy-content h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-primary);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  margin-top: 10px;
}

.privacy-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 6px;
}

.privacy-content p {
  font-size: 0.96rem;
}

.privacy-content ul {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.privacy-callout {
  background: rgba(99, 102, 241, 0.08);
  border-left: 4px solid var(--brand-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  font-size: 0.92rem;
  color: var(--text-primary);
}

.privacy-callout.success {
  background: rgba(16, 185, 129, 0.08);
  border-left-color: var(--brand-emerald);
}

.privacy-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.88rem;
}

.privacy-table th, .privacy-table td {
  padding: 12px 16px;
  text-align: left;
  border: 1px solid var(--border-color);
}

.privacy-table th {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-weight: 600;
}

.privacy-table tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

/* 回到顶部悬浮按钮 */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-fast);
  z-index: 90;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
}

/* 响应式断点适配 */
@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 48px;
  }

  .pill-badge {
    align-self: center;
  }

  .hero-subtitle {
    margin: 0 auto;
  }

  .hero-cta-group {
    justify-content: center;
  }

  .hero-stats-row {
    max-width: 500px;
    margin: 24px auto 0;
  }

  .bento-card.col-8,
  .bento-card.col-4,
  .bento-card.col-6 {
    grid-column: span 12;
  }

  .deepdive-grid, .deepdive-grid.reverse {
    grid-template-columns: 1fr;
    direction: ltr;
    gap: 40px;
  }

  .privacy-badge-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .privacy-body-layout {
    grid-template-columns: 1fr;
  }

  .privacy-toc {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  .nav-links, .nav-actions .btn-primary {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .section {
    padding: 60px 0;
  }

  .hero-stats-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .privacy-badge-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .iphone-frame {
    width: 290px;
  }

  .cta-banner {
    padding: 40px 20px;
  }
}