```css
/* ===== 优优色影院 - 完整样式表 ===== */
:root {
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --bg-header: #0f172a;
  --bg-footer: #0b1120;
  --bg-soft: #eef2f6;
  --text-primary: #1e293b;
  --text-secondary: #334155;
  --text-heading: #0f172a;
  --text-link: #1d4ed8;
  --text-nav: #f1f5f9;
  --text-btn: #ffffff;
  --btn-bg: #dc2626;
  --border: #cbd5e1;
  --chip-bg: #e2e8f0;
  --code-bg: #f1f5f9;
  --text-white: #ffffff;
  --shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
  --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.12);
  --radius: 16px;
  --radius-sm: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --header-height: 70px;
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-banner: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
  --gradient-text: linear-gradient(135deg, #ff6b6b, #f0e68c);
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.15);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* 暗色模式变量覆盖 */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-soft: #1e293b;
    --text-primary: #e2e8f0;
    --text-secondary: #b0c4de;
    --text-heading: #f8fafc;
    --border: #334155;
    --chip-bg: #334155;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
  }
}

/* 手动暗黑模式 */
body.darkmode {
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-soft: #1e293b;
  --text-primary: #e2e8f0;
  --text-secondary: #b0c4de;
  --text-heading: #f8fafc;
  --border: #334155;
  --chip-bg: #334155;
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
}

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

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

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  line-height: 1.6;
  font-size: 16px;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

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

a:hover {
  color: var(--btn-bg);
}

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

p {
  color: var(--text-primary);
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

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

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, #667eea, #764ba2);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, #5a67d8, #6b46c1);
}

/* ===== 导航栏 ===== */
.site-header {
  background: var(--bg-header);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  background: rgba(15, 23, 42, 0.95);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.header-flex {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  width: 100%;
}

.logo {
  color: var(--text-white);
  font-weight: 700;
  font-size: 1.6rem;
  letter-spacing: 1px;
  text-decoration: none;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: transform 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

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

.nav-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
}

.nav-links a {
  color: #e2e8f0;
  text-decoration: none;
  font-weight: 500;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
  position: relative;
  font-size: 0.95rem;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #ff6b6b, #f0e68c);
  transition: width 0.3s ease;
}

.nav-links a:hover {
  color: #ffffff;
}

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

/* 搜索框 */
.search-box {
  display: flex;
  background: rgba(30, 41, 59, 0.8);
  border-radius: 30px;
  padding: 4px 6px;
  border: 1px solid rgba(51, 65, 85, 0.6);
  backdrop-filter: blur(5px);
  transition: var(--transition);
  align-items: center;
}

.search-box:focus-within {
  border-color: #ff6b6b;
  box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.1);
}

.search-box input {
  background: transparent;
  border: none;
  color: #f8fafc;
  padding: 6px 12px;
  outline: none;
  width: 180px;
  font-size: 0.9rem;
  transition: var(--transition);
}

.search-box input::placeholder {
  color: #94a3b8;
}

.search-box button {
  background: linear-gradient(135deg, #dc2626, #b91c1c);
  border: none;
  border-radius: 30px;
  padding: 8px 16px;
  color: white;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.9rem;
}

.search-box button:hover {
  background: linear-gradient(135deg, #b91c1c, #991b1b);
  transform: scale(1.02);
}

/* 移动端汉堡菜单 */
.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  z-index: 1100;
}

.burger span {
  width: 26px;
  height: 3px;
  background: #f1f5f9;
  border-radius: 2px;
  transition: var(--transition);
}

.burger.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.burger.active span:nth-child(2) {
  opacity: 0;
}

.burger.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ===== Banner 轮播 ===== */
.banner {
  background: var(--gradient-banner);
  color: white;
  padding: 60px 0;
  position: relative;
  overflow: hidden;
  min-height: 400px;
  display: flex;
  align-items: center;
}

.banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='80' height='80' viewBox='0 0 80 80' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M50 50c0-5.523 4.477-10 10-10s10 4.477 10 10-4.477 10-10 10c0 5.523-4.477 10-10 10s-10-4.477-10-10c-5.523 0-10-4.477-10-10s4.477-10 10-10c0-5.523 4.477-10 10-10s10 4.477 10 10z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  animation: starMove 60s linear infinite;
  opacity: 0.5;
}

@keyframes starMove {
  from { transform: translateY(0); }
  to { transform: translateY(-80px); }
}

.banner-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.banner-item {
  background: var(--glass-bg);
  border-radius: 24px;
  padding: 40px 30px;
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--glass-shadow);
  transition: var(--transition);
  animation: fadeInUp 0.6s ease both;
  position: relative;
  overflow: hidden;
}

.banner-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #ff6b6b, #f0e68c);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s ease;
}

.banner-item:hover::before {
  transform: scaleX(1);
}

.banner-item:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.banner-item h2 {
  color: white;
  font-size: 1.8rem;
  margin: 0 0 12px;
  background: linear-gradient(135deg, #ff6b6b, #f0e68c);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
}

.banner-item p {
  color: #cbd5e1;
  font-size: 1.05rem;
  line-height: 1.6;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 主体内容区 ===== */
.section-title {
  font-size: 2rem;
  color: var(--text-heading);
  margin: 50px 0 25px;
  border-left: 6px solid var(--btn-bg);
  padding-left: 18px;
  position: relative;
  font-weight: 800;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--btn-bg), transparent);
  border-radius: 2px;
}

/* ===== 卡片网格 ===== */
.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--text-link);
}

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

.card h3 {
  color: var(--text-heading);
  font-size: 1.3rem;
  margin-top: 0;
  position: relative;
  z-index: 1;
}

.card h4 {
  color: var(--text-heading);
  font-size: 1.1rem;
  position: relative;
  z-index: 1;
}

.card p {
  color: var(--text-primary);
  position: relative;
  z-index: 1;
}

.card a {
  color: var(--text-link);
  font-weight: 600;
  text-decoration: none;
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: var(--transition);
}

.card a:hover {
  color: var(--btn-bg);
  gap: 8px;
}

/* Badge */
.badge {
  display: inline-block;
  background: var(--chip-bg);
  color: var(--text-heading);
  padding: 4px 14px;
  border-radius: 30px;
  font-weight: 600;
  font-size: 0.8rem;
  margin-right: 8px;
  transition: var(--transition);
}

.badge:hover {
  background: var(--text-link);
  color: white;
}

/* ===== 公司信息 ===== */
.company-info {
  background: var(--bg-soft);
  border-radius: 20px;
  padding: 35px;
  border: 1px solid var(--border);
  color: var(--text-primary);
  transition: var(--transition);
  margin: 30px 0;
}

.company-info:hover {
  box-shadow: var(--shadow-hover);
}

.company-info strong {
  color: var(--text-heading);
}

.company-info p {
  margin-bottom: 12px;
}

/* ===== 表格 ===== */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  border-collapse: collapse;
  color: var(--text-primary);
}

th {
  background: var(--bg-header);
  color: #ffffff;
  padding: 14px 16px;
  text-align: left;
  font-weight: 600;
  letter-spacing: 0.02em;
}

td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  transition: background-color 0.2s ease;
}

tr:hover td {
  background: rgba(102, 126, 234, 0.05);
}

tr:last-child td {
  border-bottom: none;
}

/* ===== FAQ 样式 ===== */
.faq-item {
  background: var(--bg-card);
  border-radius: 12px;
  margin-bottom: 10px;
  border: 1px solid var(--border);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--text-link);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.faq-q {
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  padding: 20px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-heading);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  gap: 16px;
}

.faq-q:hover {
  background: rgba(102, 126, 234, 0.05);
}

.faq-a {
  display: none;
  padding: 0 20px 20px;
  color: var(--text-primary);
  animation: fadeIn 0.3s ease;
}

.faq-item.open .faq-a {
  display: block;
}

.faq-item.open .faq-q::after {
  content: "−";
  color: var(--btn-bg);
}

.faq-q::after {
  content: "+";
  font-size: 1.8rem;
  color: var(--btn-bg);
  font-weight: 300;
  line-height: 1;
  transition: var(--transition);
  flex-shrink: 0;
}

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

/* ===== 文章列表 ===== */
.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}

.article-list .card {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-list .card h4 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.article-meta {
  color: var(--text-secondary);
  font-weight: 400;
  font-size: 0.85rem;
  opacity: 0.8;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
  margin-bottom: 8px;
}

/* ===== 场景解决方案 ===== */
.solution-box {
  background: var(--bg-soft);
  padding: 24px;
  border-radius: 12px;
  transition: var(--transition);
  border: 1px solid transparent;
  flex: 1;
  min-width: 200px;
}

.solution-box:hover {
  transform: translateY(-4px);
  border-color: var(--text-link);
  box-shadow: var(--shadow);
}

.solution-box h4 {
  margin-bottom: 10px;
  color: var(--text-heading);
  font-size: 1.2rem;
}

/* ===== 评价卡片 ===== */
.review-card {
  flex: 1;
  min-width: 220px;
  background: var(--bg-card);
  border-left: 4px solid var(--btn-bg);
  padding: 20px;
  border-radius: 0 8px 8px 0;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

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

.review-card p {
  font-style: italic;
}

/* ===== 使用指南 ===== */
.guide-box {
  background: var(--bg-soft);
  padding: 25px;
  border-radius: 14px;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

.guide-box ol {
  padding-left: 20px;
  margin: 15px 0;
}

.guide-box li {
  margin-bottom: 8px;
  line-height: 1.6;
}

.guide-box li::marker {
  color: var(--btn-bg);
  font-weight: bold;
}

/* ===== 联系信息 ===== */
.contact-info {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.contact-info p {
  margin-bottom: 12px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.contact-info strong {
  color: var(--text-heading);
  min-width: 80px;
  display: inline-block;
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--bg-footer);
  color: #cbd5e1;
  padding: 50px 0 30px;
  margin-top: 60px;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #ff6b6b, #f0e68c, #667eea, #764ba2);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 30px;
  margin-bottom: 20px;
}

.site-footer h4 {
  color: #ffffff;
  margin-bottom: 15px;
  font-size: 1.1rem;
}

.site-footer a {
  color: #a5b4cb;
  text-decoration: none;
  transition: var(--transition);
  line-height: 1.8;
}

.site-footer a:hover {
  color: #ffffff;
  padding-left: 5px;
}

.copyright {
  border-top: 1px solid rgba(30, 41, 59, 0.8);
  padding-top: 24px;
  margin-top: 30px;
  color: #94a3b8;
  font-size: 0.9rem;
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  margin-top: 20px;
  color: #94a3b8;
  font-size: 0.8rem;
}

.footer-links a {
  color: #94a3b8;
  transition: var(--transition);
}

.footer-links a:hover {
  color: #ffffff;
}

/* ===== 返回顶部按钮 ===== */
.to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: linear-gradient(135deg, var(--btn-bg), #b91c1c);
  color: white;
  border: none;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
  z-index: 1000;
  display: none;
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
  align-items: center;
  justify-content: center;
}

.to-top.show {
  display: flex;
  opacity: 1;
  transform: translateY(0);
}

.to-top:hover {
  transform: translateY(-4px) scale(1.1);
  box-shadow: 0 12px 24px rgba(220, 38, 38, 0.4);
}

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

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

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
  .banner-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .banner-item:last-child {
    grid-column: span 2;
  }
  
  .container {
    padding: 0 16px;
  }
  
  .section-title {
    font-size: 1.6rem;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }
  
  .site-header {
    height: auto;
    min-height: var(--header-height);
    padding: 10px 0;
  }
  
  .burger {
    display: flex;
  }
  
  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 0;
    gap: 10px;
    background: var(--bg-header);
    border-radius: 12px;
    margin-top: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  }
  
  .nav-links.open {
    display: flex;
    animation: slideDown 0.3s ease;
  }
  
  @keyframes slideDown {
    from {
      opacity: 0;
      transform: translateY(-10px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  .nav-links a {
    width: 100%;
    padding: 12px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }
  
  .nav-links a::after {
    display: none;
  }
  
  .search-box {
    width: 100%;
    margin-top: 10px;
  }
  
  .search-box input {
    flex: 1;
    width: auto;
  }
  
  .banner {
    padding: 40px 0;
    min-height: auto;
  }
  
  .banner-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .banner-item {
    padding: 25px;
  }
  
  .banner-item:last-child {
    grid-column: auto;
  }
  
  .banner-item h2 {
    font-size: 1.4rem;
  }
  
  .grid-cards,
  .article-list {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
  }
  
  .section-title {
    font-size: 1.4rem;
    margin: 35px 0 20px;
  }
  
  .company-info {
    padding: 20px;
  }
  
  .footer-grid {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 20px;
  }
  
  .to-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    font-size: 1.2rem;
  }
  
  .contact-info {
    padding: 20px;
  }
  
  .contact-info p {
    flex-direction: column;
    gap: 4px;
  }
  
  .contact-info strong {
    min-width: auto;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 12px;
  }
  
  .logo {
    font-size: 1.3rem;
  }
  
  .banner-item {
    padding: 20px;
  }
  
  .banner-item h2 {
    font-size: 1.2rem;
  }
  
  .grid-cards,
  .article-list {
    grid-template-columns: 1fr;
  }
  
  .card {
    padding: 18px;
  }
  
  .section-title {
    font-size: 1.2rem;
  }
  
  .faq-q {
    padding: 16px;
    font-size: 0.95rem;
  }
  
  .faq-a {
    padding: 0 16px 16px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-links {
    flex-direction: column;
    align-items: center;
    gap: 10px;
  }
}

/* ===== 打印样式 ===== */
@media print {
  .site-header,
  .banner,
  .to-top,
  .search-box,
  .burger {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .card,
  .company-info,
  .faq-item {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }
}

/* ===== 无障碍 & 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;
  }
}

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

/* 选中文本样式 */
::selection {
  background: var(--text-link);
  color: white;
  text-shadow: none;
}

/* 暗色模式下的额外调整 */
body.darkmode .site-header {
  background: rgba(2, 6, 23, 0.95);
}

body.darkmode .banner {
  background: linear-gradient(135deg, #020617 0%, #0f172a 100%);
}

body.darkmode .card {
  background: var(--bg-card);
}

body.darkmode .company-info {
  background: var(--bg-card);
}

body.darkmode .faq-item {
  background: var(--bg-card);
}

body.darkmode .review-card {
  background: var(--bg-card);
}

body.darkmode .contact-info {
  background: var(--bg-card);
}

body.darkmode .guide-box {
  background: var(--bg-card);
}

body.darkmode .solution-box {
  background: var(--bg-card);
}

/* ===== 特殊效果 ===== */
/* 卡片悬浮光效 */
.card::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 0.5s ease;
  pointer-events: none;
}

.card:hover::after {
  left: 100%;
}

/* 玻璃拟态通用 */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

/* 渐变文本 */
.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 主按钮样式 */
.btn-primary {
  background: linear-gradient(135deg, var(--btn-bg), #b91c1c);
  color: white;
  border: none;
  padding: 12px 28px;
  border-radius: 30px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 15px rgba(220, 38, 38, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(220, 38, 38, 0.4);
  color: white;
}

/* 次级按钮 */
.btn-secondary {
  background: transparent;
  color: var(--text-link);
  border: 2px solid var(--text-link);
  padding: 10px 24px;
  border-radius: 30px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-secondary:hover {
  background: var(--text-link);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(29, 78, 216, 0.3);
}

/* 分隔线 */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 30px 0;
  border: none;
}

/* 标签 */
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--chip-bg);
  color: var(--text-primary);
  margin: 4px;
  transition: var(--transition);
  cursor: default;
}

.tag:hover {
  background: var(--text-link);
  color: white;
  transform: scale(1.05);
}

/* 动画悬浮效果 */
.hover-lift {
  transition: var(--transition);
}

.hover-lift:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}

/* 加载动画 */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.loading {
  animation: pulse 1.5s ease-in-out infinite;
}

/* 旋转动画 */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.spin {
  animation: spin 2s linear infinite;
}

/* 缩放动画 */
@keyframes zoomIn {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.zoom-in {
  animation: zoomIn 0.5s ease both;
}

/* 文字动画 */
@keyframes textShine {
  from { background-position: 0% 50%; }
  to { background-position: 100% 50%; }
}

.text-shine {
  background: linear-gradient(90deg, #ff6b6b, #f0e68c, #ff6b6b);
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: textShine 3s linear infinite;
}

/* ===== 工具类 ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-1 { margin-top: 10px; }
.mb-1 { margin-bottom: 10px; }
.mt-2 { margin-top: 20px; }
.mb-2 { margin-bottom: 20px; }
.mt-3 { margin-top: 30px; }
.mb-3 { margin-bottom: 30px; }
.mt-4 { margin-top: 40px; }
.mb-4 { margin-bottom: 40px; }

.p-1 { padding: 10px; }
.p-2 { padding: 20px; }
.p-3 { padding: 30px; }
.p-4 { padding: 40px; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 10px; }
.gap-2 { gap: 20px; }
.gap-3 { gap: 30px; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.relative { position: relative; }
.absolute { position: absolute; }
.hidden { display: none; }

.rounded { border-radius: var(--radius); }
.rounded-lg { border-radius: 24px; }
.rounded-full { border-radius: 50%; }

.shadow { box-shadow: var(--shadow); }
.shadow-lg { box-shadow: var(--shadow-hover); }
.shadow-none { box-shadow: none; }

.bg-white { background: white; }
.bg-dark { background: var(--bg-header); }
.bg-primary { background: var(--btn-bg); }

.text-white { color: white; }
.text-dark { color: var(--text-primary); }
.text-muted { color: var(--text-secondary); }
.text-error { color: #dc2626; }
.text-success { color: #16a34a; }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }
.font-light { font-weight: 300; }

.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 1.875rem; }
.text-4xl { font-size: 2.25rem; }
.text-5xl { font-size: 3rem; }

.leading-tight { line-height: 1.25; }
.leading-normal { line-height: 1.5; }
.leading-relaxed { line-height: 1.625; }

.overflow-hidden { overflow: hidden; }
.overflow-x-auto { overflow-x: auto; }
.overflow-y-auto { overflow-y: auto; }

.z-0 { z-index: 0; }
.z-10 { z-index: 10; }
.z-20 { z-index: 20; }
.z-30 { z-index: 30; }
.z-40 { z-index: 40; }
.z-50 { z-index: 50; }

.opacity-0 { opacity: 0; }
.opacity-25 { opacity: 0.25; }
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }
.opacity-100 { opacity: 1; }

.transition { transition: var(--transition); }
.transition-fast { transition: all 0.15s ease; }
.transition-slow { transition: all 0.6s ease; }

.cursor-pointer { cursor: pointer; }
.cursor-default { cursor: default; }
.cursor-not-allowed { cursor: not-allowed; }

.user-select-none {
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

.pointer-events-none { pointer-events: none; }
.pointer-events-auto { pointer-events: auto; }

.clearfix::after {
  content: '';
  display: table;
  clear: both;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* 自定义滚动条 */
.custom-scrollbar::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

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

.custom-scrollbar::-webkit-scrollbar-thumb {
  background: var(--text-link);
  border-radius: 3px;
}

.custom-scrollbar::-webkit-scrollbar-thumb:hover {
  background: var(--btn-bg);
}

/* 卡片链接区域点击 */
.card-link {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  opacity: 0;
  cursor: pointer;
}

/* 响应式字体 */
@media (max-width: 768px) {
  .text-4xl { font-size: 1.875rem; }
  .text-5xl { font-size: 2.25rem; }
}

/* 打印优化 */
@media print {
  .no-print {
    display: none !important;
  }
  
  .print-only {
    display: block !important;
  }
  
  a {
    text-decoration: underline;
  }
  
  a[href]::after {
    content: " (" attr(href) ")";
  }
}
```