```css
/* ============================================================
   看片网站 - 极致画质观影体验，电影级享受免费享
   风格：科技感影视沉浸 / 渐变 / 毛玻璃 / 响应式 / 暗色模式
   ============================================================ */

/* ---------- CSS变量与主题 ---------- */
:root {
  /* 主色 - 深邃蓝紫 + 金色点缀 */
  --bg-primary: #f0f4fa;
  --bg-card: rgba(255, 255, 255, 0.75);
  --bg-card-solid: #ffffff;
  --bg-deep: #0b1a2f;
  --bg-gradient-hero: linear-gradient(120deg, #0a1628 0%, #1b2f4d 45%, #2a4a6b 100%);
  --bg-gradient-brand: linear-gradient(135deg, #f8fafd 0%, #eef2f7 100%);
  
  --text-primary: #1a2536;
  --text-secondary: #3a4a5e;
  --text-heading: #0f1e33;
  --text-accent: #d4a017;
  --text-accent-hover: #b8860b;
  --text-on-dark: #f0f4fa;
  
  --border-light: rgba(0, 0, 0, 0.08);
  --border-glass: rgba(255, 255, 255, 0.35);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.10);
  --shadow-gold: 0 4px 20px rgba(212, 160, 23, 0.15);
  
  --glass-blur: blur(14px) saturate(160%);
  --nav-bg: rgba(255, 255, 255, 0.85);
  --footer-bg: #0c1626;
  --footer-text: #cbd5e1;
  
  --btn-bg: linear-gradient(135deg, #e0a815 0%, #b8860b 100%);
  --btn-text: #ffffff;
  --btn-hover: linear-gradient(135deg, #f0b825 0%, #c9960e 100%);
  
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  
  --font-sans: 'Inter', 'Segoe UI', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
}

[data-theme="dark"] {
  --bg-primary: #0e1625;
  --bg-card: rgba(30, 41, 59, 0.75);
  --bg-card-solid: #1e293b;
  --bg-gradient-hero: linear-gradient(120deg, #070f1a 0%, #12263b 50%, #1e3a5c 100%);
  --bg-gradient-brand: linear-gradient(135deg, #131f30 0%, #1a2a40 100%);
  
  --text-primary: #e2e8f0;
  --text-secondary: #b0c4d8;
  --text-heading: #f1f5f9;
  --text-accent: #f0c040;
  --text-accent-hover: #ffd75e;
  --text-on-dark: #e2e8f0;
  
  --border-light: rgba(255, 255, 255, 0.08);
  --border-glass: rgba(255, 255, 255, 0.12);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);
  
  --nav-bg: rgba(15, 23, 42, 0.85);
  --footer-bg: #0b1525;
  --footer-text: #94a3b8;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 16px;
  transition: background var(--transition-smooth), color var(--transition-smooth);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-heading);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

p {
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

a {
  color: var(--text-accent);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--text-accent-hover);
  text-decoration: underline;
}

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

ul, ol {
  list-style: none;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* 通用卡片样式 */
.card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-fast);
  color: var(--text-primary);
  overflow: hidden;
  position: relative;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--text-accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-smooth);
}

.card:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: var(--shadow-lg);
  border-color: rgba(212, 160, 23, 0.3);
}

.card:hover::before {
  opacity: 1;
}

.card h3, .card h4 {
  margin-bottom: 0.75rem;
  font-weight: 600;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--btn-bg);
  color: var(--btn-text);
  padding: 0.7rem 2rem;
  border-radius: 50px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition-smooth);
  box-shadow: var(--shadow-gold);
  letter-spacing: 0.02em;
  font-size: 1rem;
}

.btn:hover {
  background: var(--btn-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(212, 160, 23, 0.3);
  text-decoration: none;
}

/* 章节标题 */
.section-title {
  font-size: 2rem;
  margin: 3rem 0 1.5rem;
  padding-left: 1.25rem;
  border-left: 5px solid var(--text-accent);
  position: relative;
  font-weight: 700;
  background: linear-gradient(90deg, var(--text-heading) 30%, var(--text-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--text-accent), transparent);
  margin-top: 0.5rem;
  border-radius: 2px;
}

.sub-title {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 1.05rem;
}

/* 网格系统 */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-light);
  transition: box-shadow var(--transition-smooth);
}

.navbar.scrolled {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.logo {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-heading);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  letter-spacing: -0.02em;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.02);
}

.logo svg {
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 2px 8px rgba(212, 160, 23, 0.3));
}

.menu {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.menu a {
  color: var(--text-primary);
  font-weight: 500;
  padding: 0.4rem 0;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  font-size: 0.95rem;
  position: relative;
}

.menu a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--text-accent);
  transition: width var(--transition-smooth);
}

.menu a:hover {
  color: var(--text-accent);
  text-decoration: none;
}

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

/* 搜索框 */
.search-box {
  display: flex;
  align-items: center;
  border: 1px solid var(--border-light);
  border-radius: 50px;
  background: var(--bg-card);
  padding: 0.15rem 0.15rem 0.15rem 1.2rem;
  transition: all var(--transition-fast);
  overflow: hidden;
}

.search-box:focus-within {
  border-color: var(--text-accent);
  box-shadow: 0 0 0 3px rgba(212, 160, 23, 0.15);
}

.search-box input {
  border: none;
  background: transparent;
  color: var(--text-primary);
  outline: none;
  width: 130px;
  font-size: 0.9rem;
  transition: width var(--transition-smooth);
}

.search-box input:focus {
  width: 180px;
}

.search-box button {
  background: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  border-radius: 50px;
  padding: 0.45rem 1.2rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.9rem;
}

.search-box button:hover {
  background: var(--btn-hover);
  transform: scale(1.03);
}

/* 暗黑模式按钮 */
.dark-toggle {
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--text-primary);
  transition: transform var(--transition-fast) ease;
  padding: 0.4rem;
  border-radius: 50%;
  line-height: 1;
}

.dark-toggle:hover {
  transform: rotate(20deg) scale(1.1);
}

/* 汉堡菜单 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 8px;
  transition: background var(--transition-fast);
}

.hamburger:hover {
  background: rgba(128, 128, 128, 0.1);
}

.hamburger span {
  width: 26px;
  height: 2.5px;
  background: var(--text-primary);
  border-radius: 3px;
  transition: all var(--transition-smooth);
}

/* 移动端菜单 */
.mobile-nav {
  display: none;
  flex-direction: column;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  padding: 1rem;
  gap: 0.25rem;
  border-top: 1px solid var(--border-light);
  animation: slideDown 0.3s ease;
}

.mobile-nav a {
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  transition: all var(--transition-fast);
  font-weight: 500;
}

.mobile-nav a:hover {
  background: rgba(212, 160, 23, 0.1);
  color: var(--text-accent);
  text-decoration: none;
}

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

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Hero 区域 ---------- */
.hero {
  background: var(--bg-gradient-hero);
  color: var(--text-on-dark);
  padding: 3.5rem 0;
  margin-bottom: 2.5rem;
  border-radius: 0 0 48px 48px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(212, 160, 23, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.hero .container {
  display: flex;
  align-items: center;
  gap: 3rem;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.hero-text {
  flex: 1;
  min-width: 300px;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  color: #ffffff;
  margin-bottom: 0.75rem;
  font-weight: 700;
  line-height: 1.3;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
  letter-spacing: -0.02em;
}

.hero p {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: rgba(226, 232, 240, 0.9);
  margin-bottom: 1.75rem;
  max-width: 550px;
  line-height: 1.8;
}

.hero svg {
  width: 100%;
  max-width: 380px;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.3));
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  font-size: 0.9rem;
  margin: 1rem 0;
  color: var(--text-secondary);
  padding: 0.5rem 1.5rem;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-sm);
  display: inline-block;
}

.breadcrumb span {
  color: var(--text-accent);
}

/* ---------- 徽章 ---------- */
.badge {
  display: inline-block;
  background: linear-gradient(135deg, #e2e8f0, #cbd5e1);
  color: #1a2536;
  padding: 0.2rem 0.9rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
  letter-spacing: 0.02em;
  transition: all var(--transition-fast);
}

[data-theme="dark"] .badge {
  background: linear-gradient(135deg, #334155, #475569);
  color: #e2e8f0;
}

/* ---------- 文章项 ---------- */
.article-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.article-item h3 {
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.5;
  transition: color var(--transition-fast);
}

.article-item:hover h3 {
  color: var(--text-accent);
}

.article-item .meta {
  color: var(--text-secondary);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.link-more {
  color: var(--text-accent);
  font-weight: 600;
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: gap var(--transition-fast);
}

.link-more:hover {
  gap: 0.5rem;
  text-decoration: none;
}

/* ---------- FAQ ---------- */
details {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1rem 1.5rem;
  margin-bottom: 0.75rem;
  transition: all var(--transition-smooth);
  overflow: hidden;
}

details:hover {
  border-color: var(--text-accent);
  box-shadow: var(--shadow-sm);
}

details[open] {
  border-color: var(--text-accent);
  box-shadow: var(--shadow-md);
}

summary {
  font-weight: 600;
  cursor: pointer;
  font-size: 1.05rem;
  color: var(--text-heading);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: color var(--transition-fast);
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--text-accent);
  transition: transform var(--transition-smooth);
}

details[open] summary::after {
  transform: rotate(45deg);
}

summary:hover {
  color: var(--text-accent);
}

details p {
  color: var(--text-primary);
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
  line-height: 1.8;
}

/* ---------- 表格 ---------- */
table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

th, td {
  padding: 0.85rem 1rem;
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  text-align: left;
}

th {
  background: linear-gradient(135deg, #e9edf2, #dde3e9);
  color: #17202A;
  font-weight: 600;
  letter-spacing: 0.03em;
}

[data-theme="dark"] th {
  background: linear-gradient(135deg, #1e293b, #273549);
  color: #f1f5f9;
}

tr {
  transition: background var(--transition-fast);
}

tr:hover {
  background: rgba(212, 160, 23, 0.04);
}

/* ---------- 图标 ---------- */
.svg-icon {
  width: 48px;
  height: 48px;
  color: var(--text-accent);
  margin-bottom: 1rem;
  transition: transform var(--transition-smooth);
}

.card:hover .svg-icon {
  transform: scale(1.1) rotate(-3deg);
}

/* ---------- 页脚 ---------- */
footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 3rem 0 2rem;
  margin-top: 4rem;
  position: relative;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--text-accent), transparent, var(--text-accent));
  opacity: 0.3;
}

footer h4 {
  color: #e2e8f0;
  margin-bottom: 1rem;
  font-size: 1.1rem;
  font-weight: 600;
}

footer a {
  color: var(--footer-text);
  transition: color var(--transition-fast);
}

footer a:hover {
  color: var(--text-accent);
  text-decoration: none;
}

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

.footer-bottom {
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  margin-top: 2rem;
  padding-top: 1.5rem;
  text-align: center;
  color: var(--footer-text);
  font-size: 0.9rem;
}

/* ---------- 返回顶部 ---------- */
#topBtn {
  position: fixed;
  bottom: 2rem;
  right: 1.5rem;
  background: var(--btn-bg);
  color: white;
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 1.5rem;
  cursor: pointer;
  display: none;
  z-index: 999;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-smooth);
  opacity: 0;
  transform: translateY(20px);
}

#topBtn.show {
  opacity: 1;
  transform: translateY(0);
}

#topBtn:hover {
  background: var(--btn-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(212, 160, 23, 0.4);
}

/* ---------- 滚动动画 ---------- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .container {
    padding: 0 1.25rem;
  }
  
  .grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
  
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 960px) {
  .menu,
  .search-box {
    display: none;
  }
  
  .hamburger {
    display: flex;
  }
  
  .mobile-nav.open {
    display: flex;
  }
  
  .hero h1 {
    font-size: 2.2rem;
  }
  
  .hero .container {
    gap: 1.5rem;
    text-align: center;
  }
  
  .hero-text {
    min-width: 100%;
  }
  
  .hero p {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero svg {
    margin: 0 auto;
    max-width: 280px;
  }
  
  .section-title {
    font-size: 1.5rem;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 1rem;
  }
  
  .nav-wrap {
    padding: 0.6rem 1rem;
  }
  
  .logo {
    font-size: 1.3rem;
  }
  
  .logo svg {
    width: 30px;
    height: 30px;
  }
  
  .grid-3 {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .card {
    padding: 1.25rem;
  }
  
  .hero {
    padding: 2.5rem 0;
    border-radius: 0 0 32px 32px;
  }
  
  .hero h1 {
    font-size: 1.8rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .btn {
    padding: 0.6rem 1.6rem;
    font-size: 0.95rem;
  }
  
  .section-title {
    font-size: 1.35rem;
    margin: 2rem 0 1rem;
  }
  
  details {
    padding: 0.85rem 1rem;
  }
  
  summary {
    font-size: 0.95rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  #topBtn {
    width: 44px;
    height: 44px;
    font-size: 1.3rem;
    bottom: 1.5rem;
    right: 1rem;
  }
}

/* ---------- 无障碍与可访问性 ---------- */
@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;
  }
}

::selection {
  background: rgba(212, 160, 23, 0.3);
  color: var(--text-heading);
}

/* 滚动条美化 */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--text-accent), #8a6d1a);
  border-radius: 10px;
  border: 2px solid var(--bg-primary);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, #f0c040, #b8860b);
}

/* 链接悬停下划线动画 */
a:not(.btn):not(.link-more) {
  position: relative;
}

/* 焦点可见性 */
:focus-visible {
  outline: 3px solid var(--text-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* 内容区域间距 */
main {
  min-height: 70vh;
}

/* 品牌与产品卡片特殊效果 */
#brand .card,
#products .card,
#solutions .card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
}

/* 列表样式 */
ol li {
  margin-bottom: 0.5rem;
  padding-left: 0.5rem;
  position: relative;
}

ol li::marker {
  color: var(--text-accent);
  font-weight: 600;
}

/* 联系方式区块 */
#contact .card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
}

/* 动画：卡片交错入场 */
@keyframes cardFadeIn {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.grid-3 .card,
.grid-2 .card {
  animation: cardFadeIn 0.6s ease forwards;
  opacity: 0;
}

.grid-3 .card:nth-child(1),
.grid-2 .card:nth-child(1) {
  animation-delay: 0.1s;
}

.grid-3 .card:nth-child(2),
.grid-2 .card:nth-child(2) {
  animation-delay: 0.2s;
}

.grid-3 .card:nth-child(3),
.grid-2 .card:nth-child(3) {
  animation-delay: 0.3s;
}

.grid-3 .card:nth-child(4),
.grid-2 .card:nth-child(4) {
  animation-delay: 0.4s;
}

.grid-3 .card:nth-child(5),
.grid-2 .card:nth-child(5) {
  animation-delay: 0.5s;
}

.grid-3 .card:nth-child(6),
.grid-2 .card:nth-child(6) {
  animation-delay: 0.6s;
}

.grid-3 .card:nth-child(7),
.grid-2 .card:nth-child(7) {
  animation-delay: 0.7s;
}

.grid-3 .card:nth-child(8),
.grid-2 .card:nth-child(8) {
  animation-delay: 0.8s;
}

.grid-3 .card:nth-child(9),
.grid-2 .card:nth-child(9) {
  animation-delay: 0.9s;
}

.grid-3 .card:nth-child(10),
.grid-2 .card:nth-child(10) {
  animation-delay: 1s;
}

/* 暗色模式下的卡片微调 */
[data-theme="dark"] .card {
  background: var(--bg-card);
  border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .card::before {
  background: linear-gradient(90deg, transparent, var(--text-accent), transparent);
}

/* 打印样式 */
@media print {
  .navbar,
  .hero,
  .dark-toggle,
  .hamburger,
  .mobile-nav,
  #topBtn,
  footer {
    display: none !important;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }
}
```