```css
/* =========================================================
   蓝颜TV - 完整样式表
   风格：现代科技蓝 + 玻璃拟态 + 微动效
   响应式 + 暗色模式适配
   ========================================================= */

/* ---------- CSS 变量（色彩体系） ---------- */
:root {
  --bg: #f4f7fb;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-footer: #0b1f2a;
  --text-primary: #1F2937;
  --text-secondary: #3e4c5e;
  --text-heading: #111827;
  --text-link: #1d4ed8;
  --text-footer: #d1d5db;
  --border-color: #d0d7de;
  --btn-bg: #0b3b5c;
  --btn-text: #ffffff;
  --nav-bg: rgba(255, 255, 255, 0.7);
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.1);
  --banner-gradient: linear-gradient(135deg, #0b3b5c 0%, #1a5a7a 50%, #2d7a9e 100%);
  --banner-text: #ffffff;
  --tag-bg: #e6edf3;
  --tag-text: #1F2937;
  --glass-bg: rgba(255, 255, 255, 0.6);
  --glass-border: rgba(255, 255, 255, 0.4);
  --card-hover: rgba(255, 255, 255, 0.95);
  --accent-glow: rgba(29, 78, 216, 0.15);
  --footer-link: #b0c8d9;
}

/* 暗色模式 */
[data-theme="dark"] {
  --bg: #0f1a24;
  --bg-card: rgba(30, 42, 54, 0.85);
  --bg-footer: #0a121a;
  --text-primary: #E2E8F0;
  --text-secondary: #b0c4de;
  --text-heading: #F8FAFC;
  --text-link: #7cb8ff;
  --text-footer: #cbd5e1;
  --border-color: #2d3f4e;
  --btn-bg: #2079b0;
  --btn-text: #ffffff;
  --nav-bg: rgba(15, 26, 36, 0.7);
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.5);
  --banner-gradient: linear-gradient(135deg, #0a1a2a 0%, #1f4a66 50%, #2d6a8a 100%);
  --tag-bg: #2a3b4a;
  --tag-text: #E2E8F0;
  --glass-bg: rgba(30, 42, 54, 0.6);
  --glass-border: rgba(255, 255, 255, 0.1);
  --card-hover: rgba(30, 42, 54, 0.95);
  --accent-glow: rgba(124, 184, 255, 0.15);
  --footer-link: #b0c8d9;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  line-height: 1.7;
  transition: background 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

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

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(135deg, var(--btn-bg), #1a5a7a);
  border-radius: 10px;
  border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
  background: #1a5a7a;
}

/* ---------- 链接 ---------- */
a {
  color: var(--text-link);
  text-decoration: none;
  transition: color 0.2s ease, text-decoration 0.2s ease;
}

a:hover {
  text-decoration: underline;
  color: var(--text-link);
  opacity: 0.85;
}

/* ---------- 标题 ---------- */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-heading);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.6rem, 4vw, 2rem);
  margin: 2rem 0 1rem;
  position: relative;
  display: inline-block;
}

h2::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--btn-bg), #1a5a7a);
  border-radius: 4px;
}

h3 {
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  margin: 1.5rem 0 0.8rem;
}

h4 {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  margin: 1rem 0 0.5rem;
}

p {
  margin-bottom: 1rem;
}

/* ---------- 容器 ---------- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

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

/* ---------- 导航栏（毛玻璃） ---------- */
.navbar {
  background: var(--nav-bg);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: background 0.3s ease;
}

.nav-flex {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.logo {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-heading);
  background: linear-gradient(135deg, var(--btn-bg), #1a5a7a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.03em;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--text-primary);
  font-weight: 500;
  position: relative;
  padding: 0.3rem 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--btn-bg);
  transition: width 0.3s ease;
}

.nav-links a:hover {
  color: var(--text-link);
  text-decoration: none;
}

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

.theme-toggle {
  background: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  padding: 0.5rem 1.2rem;
  border-radius: 2rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.theme-toggle:hover {
  background: #1a5a7a;
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

/* 移动端菜单按钮 */
.menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  color: var(--text-heading);
  cursor: pointer;
  transition: transform 0.3s ease;
}

.menu-btn:hover {
  transform: scale(1.1);
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    background: var(--bg-card);
    padding: 1.5rem;
    gap: 1rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
  }

  .nav-links.show {
    display: flex;
    animation: slideDown 0.3s ease;
  }

  .menu-btn {
    display: block;
  }
}

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

/* ---------- Banner（渐变+毛玻璃） ---------- */
.banner {
  background: var(--banner-gradient);
  color: var(--banner-text);
  padding: 4rem 0 3.5rem;
  margin-bottom: 2.5rem;
  border-radius: 0 0 3rem 3rem;
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

.banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  transform: rotate(30deg);
}

.banner h1 {
  color: #ffffff;
  margin-bottom: 0.8rem;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
  position: relative;
  z-index: 1;
}

.banner p {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: rgba(255, 255, 255, 0.9);
  max-width: 600px;
  margin-bottom: 1.5rem;
  position: relative;
  z-index: 1;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

/* 按钮 */
.btn {
  display: inline-block;
  background: var(--btn-bg);
  color: var(--btn-text);
  padding: 0.8rem 2rem;
  border-radius: 2rem;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  z-index: 1;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.btn:hover {
  background: #1a5a7a;
  color: white;
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.btn:active {
  transform: translateY(-1px);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-size: 0.9rem;
  margin-bottom: 2rem;
  color: var(--text-secondary);
  padding: 0.5rem 0;
}

.breadcrumb span {
  transition: color 0.2s;
}

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

/* ---------- 卡片（毛玻璃+圆角） ---------- */
.card {
  background: var(--bg-card);
  border-radius: 1.5rem;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--btn-bg), #1a5a7a, #2d7a9e);
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

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

/* ---------- 网格布局 ---------- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

/* ---------- 列表样式 ---------- */
.list-styled {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.list-styled li {
  margin-bottom: 0.6rem;
  position: relative;
  padding-left: 0.5rem;
}

.list-styled li::marker {
  color: var(--btn-bg);
}

/* 有序列表 */
ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

ol li {
  margin-bottom: 0.5rem;
  padding-left: 0.3rem;
}

/* ---------- FAQ 手风琴 ---------- */
.faq-item {
  border-bottom: 1px solid var(--border-color);
  padding: 1.2rem 0;
  transition: background 0.3s ease;
}

.faq-item:first-child {
  border-top: 1px solid var(--border-color);
}

.faq-question {
  font-weight: 600;
  cursor: pointer;
  color: var(--text-heading);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.05rem;
  transition: color 0.2s;
  padding: 0.3rem 0;
}

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

.faq-question::after {
  content: '▾';
  font-size: 1.4rem;
  transition: transform 0.3s ease;
  color: var(--btn-bg);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  color: var(--text-primary);
  padding-top: 0;
  line-height: 1.8;
}

.faq-item.open .faq-answer {
  max-height: 500px;
  padding-top: 0.8rem;
}

/* ---------- 表格 ---------- */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  border-radius: 0.8rem;
  overflow: hidden;
  box-shadow: var(--shadow);
}

th, td {
  padding: 0.8rem 1.2rem;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  text-align: left;
}

th {
  background-color: var(--tag-bg);
  color: var(--text-heading);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}

tr {
  transition: background 0.2s;
}

tr:hover {
  background: var(--tag-bg);
  opacity: 0.9;
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 0.3rem 1.2rem;
  border-radius: 2rem;
  font-size: 0.8rem;
  margin: 0.2rem;
  font-weight: 500;
  transition: all 0.2s ease;
  border: 1px solid var(--border-color);
}

.tag:hover {
  background: var(--btn-bg);
  color: var(--btn-text);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* ---------- 文章卡片 ---------- */
.article-card {
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem 0;
  transition: all 0.3s ease;
  border-radius: 0.5rem;
}

.article-card:last-child {
  border-bottom: none;
}

.article-card:hover {
  background: var(--glass-bg);
  padding-left: 1rem;
  padding-right: 1rem;
  border-radius: 1rem;
}

.article-card h3 {
  margin-bottom: 0.3rem;
  font-size: 1.2rem;
}

.article-card h3 a {
  color: var(--text-heading);
  transition: color 0.2s;
}

.article-card h3 a:hover {
  color: var(--text-link);
  text-decoration: none;
}

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

.article-meta::before {
  content: '📅';
  font-size: 0.9rem;
}

/* ---------- 统计数字 ---------- */
.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-heading);
  background: linear-gradient(135deg, var(--btn-bg), #1a5a7a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- 页脚 ---------- */
footer {
  background: var(--bg-footer);
  color: var(--text-footer);
  padding: 3rem 0 2rem;
  margin-top: 3rem;
  border-top: 1px solid #1f3a4a;
  position: relative;
}

footer a {
  color: var(--footer-link);
  transition: color 0.2s;
}

footer a:hover {
  color: #ffffff;
  text-decoration: none;
}

footer p, footer li, footer span {
  color: var(--text-footer);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-bottom: 2rem;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

.footer-title {
  color: #ffffff;
  font-weight: 700;
  margin-bottom: 1rem;
  font-size: 1.1rem;
  position: relative;
  display: inline-block;
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--btn-bg);
}

.copyright {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid #1f3a4a;
  margin-top: 2rem;
  font-size: 0.9rem;
}

.copyright p {
  margin-bottom: 0.5rem;
}

/* ---------- 返回顶部按钮 ---------- */
#backToTop {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--btn-bg);
  color: white;
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  font-size: 1.5rem;
  cursor: pointer;
  display: none;
  z-index: 1000;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  transition: all 0.3s ease;
}

#backToTop:hover {
  transform: translateY(-4px) scale(1.05);
  background: #1a5a7a;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

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

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 延迟动画 */
.reveal[data-delay="1"] { transition-delay: 0.1s; }
.reveal[data-delay="2"] { transition-delay: 0.2s; }
.reveal[data-delay="3"] { transition-delay: 0.3s; }
.reveal[data-delay="4"] { transition-delay: 0.4s; }
.reveal[data-delay="5"] { transition-delay: 0.5s; }

/* ---------- 高亮文本 ---------- */
::selection {
  background: var(--btn-bg);
  color: #ffffff;
}

/* ---------- 表单控件 ---------- */
input, textarea, select {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.8rem 1rem;
  border-radius: 0.8rem;
  transition: all 0.3s ease;
  font-size: 1rem;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--btn-bg);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ---------- 响应式调整 ---------- */
@media (max-width: 1024px) {
  .container {
    max-width: 100%;
    padding: 0 1.5rem;
  }
}

@media (max-width: 768px) {
  .banner {
    padding: 3rem 0 2.5rem;
    border-radius: 0 0 2rem 2rem;
  }

  .card {
    padding: 1.5rem;
    border-radius: 1.2rem;
  }

  .grid-2, .grid-3 {
    gap: 1rem;
  }

  h1 {
    font-size: 1.8rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .theme-toggle {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
  }

  #backToTop {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 42px;
    height: 42px;
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 0.8rem;
  }

  .card {
    padding: 1.2rem;
  }

  .footer-grid {
    gap: 1rem;
  }

  .banner p {
    font-size: 1rem;
  }

  .btn {
    padding: 0.6rem 1.5rem;
    font-size: 0.9rem;
  }
}

/* ---------- 打印样式 ---------- */
@media print {
  .navbar, .banner, #backToTop, footer, .breadcrumb {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }
}

/* ---------- 无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

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

/* ---------- 高对比度模式 ---------- */
@media (prefers-contrast: high) {
  :root {
    --text-primary: #000000;
    --text-secondary: #1a1a1a;
    --bg: #ffffff;
    --bg-card: #ffffff;
    --border-color: #000000;
  }

  [data-theme="dark"] {
    --text-primary: #ffffff;
    --text-secondary: #e0e0e0;
    --bg: #000000;
    --bg-card: #1a1a1a;
    --border-color: #ffffff;
  }
}

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

/* ---------- 动画微交互 ---------- */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

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

/* 卡片悬浮微光效 */
.card:hover {
  box-shadow: var(--shadow-hover), 0 0 40px var(--accent-glow);
}

/* 图片响应式 */
img {
  max-width: 100%;
  height: auto;
  border-radius: 0.8rem;
}

/* 代码块 */
pre, code {
  background: var(--tag-bg);
  color: var(--text-primary);
  border-radius: 0.5rem;
  padding: 0.2rem 0.5rem;
  font-family: 'Fira Code', monospace;
  font-size: 0.9rem;
}

pre {
  padding: 1rem;
  overflow-x: auto;
  border: 1px solid var(--border-color);
}

/* 分隔线 */
hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 2rem 0;
}

/* 块引用 */
blockquote {
  border-left: 4px solid var(--btn-bg);
  padding-left: 1.2rem;
  margin: 1.5rem 0;
  color: var(--text-secondary);
  font-style: italic;
}

/* 联系方式卡片图标 */
#contact p {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

#contact p::before {
  font-size: 1.2rem;
}

/* 联系方式图标 */
#contact p:nth-of-type(1)::before { content: '📍'; }
#contact p:nth-of-type(2)::before { content: '📞'; }
#contact p:nth-of-type(3)::before { content: '✉️'; }
#contact p:nth-of-type(4)::before { content: '🕐'; }
#contact p:nth-of-type(5)::before { content: '🛡️'; }

/* 网站地图链接样式 */
.card h3 + p a {
  margin-right: 0.5rem;
  display: inline-block;
  padding: 0.3rem 0.8rem;
  border-radius: 0.5rem;
  transition: all 0.2s;
}

.card h3 + p a:hover {
  background: var(--tag-bg);
  text-decoration: none;
  transform: translateY(-2px);
}

/* 页脚链接悬停 */
.footer-grid div p a {
  display: block;
  margin-bottom: 0.3rem;
  transition: padding-left 0.2s;
}

.footer-grid div p a:hover {
  padding-left: 0.5rem;
  color: #ffffff;
}

/* 版权区域 */
.copyright p:last-child {
  font-size: 0.85rem;
  opacity: 0.8;
}

/* 表格响应式 */
@media (max-width: 600px) {
  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}

/* FAQ 区域动画 */
.faq-item {
  animation: fadeInUp 0.4s ease;
}

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

/* 文章卡片时间线装饰 */
.article-card {
  position: relative;
}

.article-card::before {
  content: '';
  position: absolute;
  left: -1.5rem;
  top: 1.5rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--btn-bg);
  opacity: 0;
  transition: opacity 0.3s;
}

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

/* 品牌区域特殊样式 */
#brand .card {
  background: linear-gradient(135deg, var(--bg-card), var(--glass-bg));
}

#brand h2 {
  color: var(--btn-bg);
}

/* 产品区域网格 */
#products .grid-2 > div:first-child {
  border-right: 1px solid var(--border-color);
  padding-right: 2rem;
}

@media (max-width: 768px) {
  #products .grid-2 > div:first-child {
    border-right: none;
    padding-right: 0;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
  }
}

/* 解决方案卡片 */
#solutions .grid-3 div {
  padding: 1.5rem;
  border-radius: 1rem;
  background: var(--glass-bg);
  border: 1px solid var(--border-color);
  transition: all 0.3s;
}

#solutions .grid-3 div:hover {
  background: var(--bg-card);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

/* 案例区域 */
#cases .grid-2 > div {
  background: var(--glass-bg);
  padding: 1.5rem;
  border-radius: 1rem;
  border: 1px solid var(--border-color);
}

/* 下载按钮特殊样式 */
.btn[href="#download"] {
  background: linear-gradient(135deg, #ff6b35, #f7931e);
  box-shadow: 0 4px 20px rgba(255, 107, 53, 0.4);
}

.btn[href="#download"]:hover {
  background: linear-gradient(135deg, #e55a2b, #e6821a);
  box-shadow: 0 8px 30px rgba(255, 107, 53, 0.5);
}

/* 无脚本提示 */
noscript {
  display: block;
  background: #ff6b6b;
  color: white;
  padding: 1rem;
  text-align: center;
  font-weight: 600;
}

/* 暗色模式下的特殊调整 */
[data-theme="dark"] .card {
  backdrop-filter: blur(20px);
  background: rgba(30, 42, 54, 0.7);
}

[data-theme="dark"] .nav-links a::after {
  background: #7cb8ff;
}

[data-theme="dark"] .btn[href="#download"] {
  background: linear-gradient(135deg, #ff8c5a, #ffa64d);
}

/* 移动端菜单动画 */
@media (max-width: 768px) {
  .nav-links.show {
    position: absolute;
    top: 100%;
    left: 1rem;
    right: 1rem;
    z-index: 999;
  }
}

/* 滚动进度条效果（可选） */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--btn-bg), #1a5a7a, #2d7a9e);
  z-index: 2000;
  transition: width 0.1s ease;
  width: 0;
}

/* 当页面滚动时更新 */
body.scrolled::before {
  width: calc(var(--scroll-progress) * 100%);
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  .card:hover {
    transform: none;
  }

  .btn:hover {
    transform: none;
  }
}

/* 安全区域适配 */
@supports (padding: env(safe-area-inset-bottom)) {
  footer {
    padding-bottom: calc(2rem + env(safe-area-inset-bottom));
  }
}

/* 打印时显示URL */
@media print {
  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }
}

/* 暗色模式下的图片滤镜 */
[data-theme="dark"] img {
  filter: brightness(0.9) contrast(1.05);
}

/* 圆角统一 */
.card, .banner, .btn, .theme-toggle, input, textarea, select {
  border-radius: 1rem;
}

/* 阴影层次 */
.card {
  box-shadow: 0 1px 3px rgba(0,0,0,0.05), 0 8px 24px rgba(0,0,0,0.05);
}

.card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.08), 0 16px 40px rgba(0,0,0,0.1);
}

/* 字体优化 */
body {
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 行高微调 */
p, li {
  line-height: 1.75;
}

/* 标题字重 */
h1, h2, h3 {
  font-weight: 700;
}

/* 链接下划线动画 */
.nav-links a, .card a {
  position: relative;
}

/* 卡片内链接 */
.card a:not(.btn) {
  font-weight: 500;
}

.card a:not(.btn):hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* FAQ 展开动画优化 */
.faq-answer {
  transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease;
}

/* 文章卡片悬停效果增强 */
.article-card {
  position: relative;
  overflow: hidden;
}

.article-card::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--btn-bg), #1a5a7a);
  transform: scaleY(0);
  transition: transform 0.3s ease;
  transform-origin: top;
}

.article-card:hover::after {
  transform: scaleY(1);
}

/* 品牌 logo 动画 */
.logo {
  transition: transform 0.3s ease;
}

.logo:hover {
  transform: scale(1.05);
}

/* 面包屑分隔符样式 */
.breadcrumb span:not(:last-child)::after {
  content: '›';
  margin-left: 0.5rem;
  color: var(--text-secondary);
  opacity: 0.6;
}

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

/* 移动端卡片间距 */
@media (max-width: 480px) {
  .card {
    margin-bottom: 1.5rem;
  }
}

/* 暗色模式滚动条 */
[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: linear-gradient(135deg, #2079b0, #1a5a7a);
  border: 2px solid #0f1a24;
}

/* 完成 */
```