```css
/* ============================================
   大哥影院 - 完整样式表 (style.css)
   风格: 现代影视 + 深蓝主调 + 毛玻璃 + 渐变光晕
   ============================================ */

/* ---------- CSS变量 & 主题 ---------- */
:root {
  --bg-body: #f4f7fb;
  --bg-primary: #ffffff;
  --bg-secondary: #eef2f7;
  --bg-card: rgba(255, 255, 255, 0.7);
  --bg-glass: rgba(255, 255, 255, 0.5);
  --bg-nav: rgba(255, 255, 255, 0.8);
  --text-primary: #1e293b;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --title-color: #0f172a;
  --border-color: #d1d9e8;
  --brand: #2c6e9e;
  --brand-light: #3b82f6;
  --brand-glow: rgba(59, 130, 246, 0.25);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.12);
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --nav-height: 68px;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
}

html[data-theme="dark"] {
  --bg-body: #0b1017;
  --bg-primary: #12181f;
  --bg-secondary: #1a2230;
  --bg-card: rgba(30, 41, 59, 0.7);
  --bg-glass: rgba(15, 23, 42, 0.6);
  --bg-nav: rgba(15, 23, 42, 0.85);
  --text-primary: #e2e8f0;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --title-color: #f8fafc;
  --border-color: #334155;
  --brand: #3b82f6;
  --brand-light: #60a5fa;
  --brand-glow: rgba(59, 130, 246, 0.2);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.75;
  transition: background-color 0.4s ease, color 0.3s ease;
  overflow-x: hidden;
  min-height: 100vh;
}

body.no-scroll {
  overflow: hidden;
}

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

a {
  color: var(--brand-light);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--brand);
}

h1, h2, h3, h4, h5, h6 {
  color: var(--title-color);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

/* ---------- 通用容器 ---------- */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(100, 116, 139, 0.3);
  border-radius: 20px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(100, 116, 139, 0.5);
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--bg-nav);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: box-shadow 0.3s ease, background-color 0.3s ease;
}

.navbar.scrolled {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--title-color);
  letter-spacing: -0.02em;
}

.logo a {
  color: inherit;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.logo .logo-icon {
  font-size: 1.8rem;
  filter: drop-shadow(0 0 8px var(--brand-glow));
}

/* 导航菜单 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-menu a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.25rem 0;
  position: relative;
  transition: color 0.3s;
}

.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--brand);
  border-radius: 2px;
  transition: width 0.3s ease;
}

.nav-menu a:hover {
  color: var(--brand);
}

.nav-menu a:hover::after {
  width: 100%;
}

/* 导航操作区 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* 搜索框 */
.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
  border: 1px solid transparent;
  border-radius: 50px;
  padding: 0.3rem 0.3rem 0.3rem 1rem;
  transition: all 0.3s ease;
  width: 220px;
}

.search-box:focus-within {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-glow);
  width: 260px;
}

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  font-size: 0.9rem;
  color: var(--text-primary);
  width: 100%;
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-box button {
  background: var(--brand);
  border: none;
  color: white;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: background-color 0.3s, transform 0.2s;
  flex-shrink: 0;
}

.search-box button:hover {
  background: var(--brand-light);
  transform: scale(1.05);
}

/* 图标按钮 */
.icon-btn {
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.3s, color 0.3s, transform 0.2s;
  position: relative;
}

.icon-btn:hover {
  background: var(--bg-secondary);
  color: var(--brand);
  transform: scale(1.05);
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.6rem;
  cursor: pointer;
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  transition: background-color 0.3s;
}

.menu-toggle:hover {
  background: var(--bg-secondary);
}

/* ---------- Hero Banner ---------- */
.hero {
  position: relative;
  padding: calc(var(--nav-height) + 3rem) 0 4rem;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #2c6e9e 100%);
  overflow: hidden;
  isolation: isolate;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(99, 102, 241, 0.2) 0%, transparent 40%);
  z-index: -1;
}

.hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
  z-index: -1;
  animation: heroGlow 10s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  from { transform: translateY(-20px) scale(1); opacity: 0.6; }
  to { transform: translateY(20px) scale(1.2); opacity: 1; }
}

.hero-content {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 900;
  color: #ffffff;
  margin-bottom: 1.2rem;
  line-height: 1.2;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.hero h1 .highlight {
  background: linear-gradient(135deg, #60a5fa, #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .lead {
  font-size: 1.15rem;
  color: rgba(226, 232, 240, 0.9);
  margin-bottom: 2rem;
  line-height: 1.8;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.2);
}

/* Hero 按钮组 */
.hero-btns {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* 按钮基础 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 2rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  gap: 0.5rem;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.5s, height 0.5s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn .btn-text {
  position: relative;
  z-index: 1;
}

.btn-primary {
  background: linear-gradient(135deg, #3b82f6, #2c6e9e);
  color: white;
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.4);
}

.btn-outline {
  border: 2px solid rgba(255, 255, 255, 0.5);
  color: white;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: white;
  transform: translateY(-2px);
}

/* Hero SVG 卡片 */
.hero-visual {
  position: relative;
}

.hero-card {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 24px;
  padding: 2rem;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  position: relative;
  overflow: hidden;
  animation: floatCard 6s ease-in-out infinite;
}

@keyframes floatCard {
  0%, 100% { transform: translateY(0) rotate(-1deg); }
  50% { transform: translateY(-10px) rotate(1deg); }
}

.hero-card svg {
  width: 100%;
  height: auto;
  border-radius: 16px;
}

/* 浮动装饰 */
.float-badge {
  position: absolute;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 16px;
  padding: 0.75rem 1.25rem;
  font-size: 0.85rem;
  color: white;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  animation: floatBadge 5s ease-in-out infinite;
}

.float-badge-1 {
  top: -20px;
  left: -20px;
  animation-delay: 0s;
}

.float-badge-2 {
  bottom: -15px;
  right: -10px;
  animation-delay: 1.5s;
}

@keyframes floatBadge {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ---------- 区块通用 ---------- */
.section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: 2.2rem;
  font-weight: 800;
  position: relative;
  display: inline-block;
  padding-bottom: 0.5rem;
}

.section-header h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 3px;
  background: linear-gradient(90deg, var(--brand), var(--brand-light));
  border-radius: 4px;
}

.section-header p {
  max-width: 600px;
  margin: 0.5rem auto 0;
  color: var(--text-muted);
}

/* 标题下划线样式（原有h2通用） */
.container > h2 {
  margin-top: 4rem;
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--border-color);
  position: relative;
}

.container > h2::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100px;
  height: 2px;
  background: var(--brand);
}

/* ---------- 卡片网格 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

/* 玻璃卡片 */
.card,
.article-card,
.faq-item,
.team-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.35s ease,
              background-color 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card::before,
.article-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--brand), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.card:hover,
.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.card:hover::before,
.article-card:hover::before {
  opacity: 1;
}

.card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--title-color);
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.card .card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  display: inline-block;
  background: rgba(59, 130, 246, 0.1);
  width: 64px;
  height: 64px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 品牌介绍卡片特殊样式 */
.card-brand {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(99, 102, 241, 0.08));
  border: 1px solid rgba(59, 130, 246, 0.2);
}

/* ---------- 文章卡片 ---------- */
.article-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-md);
}

.article-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.4;
  transition: color 0.3s;
}

.article-card:hover h3 {
  color: var(--brand);
}

.article-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.article-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  flex: 1;
}

.article-card .read-more {
  color: var(--brand);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: gap 0.3s;
}

.article-card .read-more:hover {
  gap: 0.5rem;
}

/* ---------- FAQ区块 ---------- */
.faq-item {
  margin-bottom: 0.75rem;
  padding: 0.25rem 1.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  border-radius: 16px;
}

.faq-item:hover {
  border-color: rgba(59, 130, 246, 0.4);
}

.faq-question {
  font-weight: 600;
  color: var(--title-color);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-color);
  transition: color 0.3s;
}

.faq-question:hover {
  color: var(--brand);
}

.faq-question .faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(59, 130, 246, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--brand);
  transition: transform 0.4s ease, background-color 0.3s;
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  background: var(--brand);
  color: white;
}

.faq-answer {
  padding: 0.5rem 0 1.2rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  display: none;
}

.faq-answer.show {
  display: block;
  animation: fadeInDown 0.4s ease;
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- HowTo 卡片 ---------- */
.howto-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  max-width: 800px;
  margin: 0 auto;
}

.howto-card h3 {
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--title-color);
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.howto-card h3:first-child {
  margin-top: 0;
}

.howto-card p {
  color: var(--text-secondary);
  margin-left: 1.75rem;
}

/* ---------- 用户评价 ---------- */
.testimonial-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  text-align: center;
  position: relative;
}

.testimonial-card::before {
  content: '"';
  font-size: 5rem;
  color: var(--brand);
  opacity: 0.3;
  position: absolute;
  top: -10px;
  left: 20px;
  font-family: Georgia, serif;
}

.testimonial-card p {
  font-style: italic;
  color: var(--text-primary);
  margin-bottom: 1rem;
  font-size: 1rem;
}

.testimonial-card .user {
  color: var(--brand);
  font-weight: 600;
  font-size: 0.9rem;
}

/* ---------- Footer ---------- */
.footer {
  background: #0f172a;
  color: #e2e8f0;
  margin-top: 5rem;
  padding: 4rem 0 2rem;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--brand), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer h4 {
  color: #ffffff;
  font-size: 1.1rem;
  margin-bottom: 1.25rem;
  font-weight: 700;
  position: relative;
  padding-bottom: 0.5rem;
}

.footer h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--brand-light);
}

.footer p {
  color: #94a3b8;
  font-size: 0.9rem;
  line-height: 1.8;
}

.footer a {
  color: #cbd5e1;
  transition: color 0.3s;
  display: inline-block;
  margin-bottom: 0.3rem;
}

.footer a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  padding-top: 2rem;
  text-align: center;
  color: #94a3b8;
  font-size: 0.85rem;
}

.footer-bottom p {
  color: #94a3b8;
  font-size: 0.85rem;
}

/* ---------- 返回顶部按钮 ---------- */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--brand), var(--brand-light));
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.2rem;
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.3);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
}

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

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(59, 130, 246, 0.4);
}

/* ---------- 滚动入场动画 ---------- */
.scroll-animate {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.scroll-animate.animated {
  opacity: 1;
  transform: translateY(0);
}

/* 延迟动画 */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }

/* ---------- 响应式设计 ---------- */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    text-align: center;
  }

  .hero-btns {
    justify-content: center;
  }

  .hero .lead {
    margin-left: auto;
    margin-right: auto;
  }

  .search-box {
    width: 180px;
  }

  .search-box:focus-within {
    width: 220px;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }

  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-nav);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.1);
    transform: translateY(-120%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: -1;
  }

  .nav-menu.active {
    transform: translateY(0);
  }

  .nav-menu a {
    font-size: 1rem;
    padding: 0.5rem 0;
  }

  .menu-toggle {
    display: flex;
  }

  .search-box {
    width: 40px;
    padding: 0;
    justify-content: center;
    background: transparent;
  }

  .search-box input {
    display: none;
  }

  .search-box button {
    background: transparent;
    color: var(--text-secondary);
    width: 40px;
    height: 40px;
  }

  .search-box button:hover {
    background: var(--bg-secondary);
    color: var(--brand);
  }

  .search-box:focus-within {
    width: 40px;
  }

  .hero {
    padding-top: calc(var(--nav-height) + 2rem);
    padding-bottom: 3rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero .lead {
    font-size: 1rem;
  }

  .section {
    padding: 3rem 0;
  }

  .section-header h2 {
    font-size: 1.8rem;
  }

  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    display: none;
  }

  .hero-btns {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-btns .btn {
    width: 100%;
  }

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

/* ---------- 无障碍 & 减少动画偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- 暗色模式优化 ---------- */
html[data-theme="dark"] .hero {
  background: linear-gradient(135deg, #0b1017 0%, #1e293b 50%, #1e3a5f 100%);
}

html[data-theme="dark"] .hero-card {
  background: rgba(15, 23, 42, 0.5);
  border-color: rgba(148, 163, 184, 0.2);
}

html[data-theme="dark"] .btn-outline {
  border-color: rgba(226, 232, 240, 0.3);
}

html[data-theme="dark"] .footer {
  background: #0b1017;
}

/* ---------- 工具类 ---------- */
.text-center { text-align: center; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }

/* 毛玻璃卡片容器 */
.glass-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

/* 胶卷装饰背景 */
.film-strip {
  position: relative;
}

.film-strip::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    90deg,
    transparent,
    transparent 20px,
    rgba(59, 130, 246, 0.03) 20px,
    rgba(59, 130, 246, 0.03) 22px
  );
  pointer-events: none;
}

/* 渐变文字 */
.gradient-text {
  background: linear-gradient(135deg, var(--brand), var(--brand-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 标签 */
.tag {
  display: inline-block;
  padding: 0.2rem 0.8rem;
  background: rgba(59, 130, 246, 0.1);
  color: var(--brand);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
}

/* 响应式字体 */
@media (max-width: 768px) {
  body {
    font-size: 15px;
  }
}
```