:root {
      --primary: #2563eb;
      --primary-hover: #1d4ed8;
      --primary-light: #eff6ff;
      --accent: #f59e0b;
      --accent-hover: #d97706;
      --text-dark: #0f172a;
      --text-body: #334155;
      --text-muted: #64748b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.03);
      --radius: 12px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.2s ease;
    }

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

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .brand-logo-wrap {
      max-width: 140px;
      display: flex;
      align-items: center;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-dark);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-body);
      padding: 8px 12px;
      border-radius: 6px;
      display: inline-block;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      text-align: center;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 10px rgba(37, 99, 235, 0.2);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      color: #ffffff;
      transform: translateY(-1px);
    }

    .btn-accent {
      background-color: var(--accent);
      color: #ffffff;
      box-shadow: 0 4px 10px rgba(245, 158, 11, 0.25);
    }

    .btn-accent:hover {
      background-color: var(--accent-hover);
      color: #ffffff;
      transform: translateY(-1px);
    }

    .btn-outline {
      background-color: #ffffff;
      color: var(--primary);
      border-color: var(--primary);
    }

    .btn-outline:hover {
      background-color: var(--primary-light);
    }

    .btn-sm {
      padding: 6px 14px;
      font-size: 0.875rem;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
      color: var(--text-dark);
    }

    /* 通用区块排版 */
    .section-wrap {
      padding: 80px 0;
      border-bottom: 1px solid var(--border-color);
      background-color: #ffffff;
    }

    .section-wrap.alt-bg {
      background-color: var(--bg-page);
    }

    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
      background: var(--primary-light);
      border-radius: 20px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-dark);
      letter-spacing: -0.5px;
      margin-bottom: 14px;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Hero 首屏 (无图片，纯CSS布局与动效) */
    .hero-section {
      padding: 90px 0 70px;
      background: linear-gradient(135deg, #f0fdf4 0%, #e0f2fe 50%, #faf5ff 100%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--text-dark);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-title .highlight {
      color: var(--primary);
      background: linear-gradient(120deg, #2563eb, #0ea5e9);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 36px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }

    .stat-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .stat-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .stat-value {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 网格卡片系统 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
      align-items: center;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #bfdbfe;
    }

    .feature-icon-badge {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: bold;
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 12px;
    }

    .feature-card p {
      font-size: 0.95rem;
      color: var(--text-body);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 标签云 */
    .tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 16px;
    }

    .tag-item {
      padding: 6px 14px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      border: 1px solid #bfdbfe;
    }

    /* 流程步骤 */
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .process-step {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      position: relative;
    }

    .step-number {
      font-size: 2.5rem;
      font-weight: 900;
      color: #cbd5e1;
      line-height: 1;
      margin-bottom: 12px;
    }

    .step-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 对比评测表格 */
    .review-score-banner {
      background: linear-gradient(135deg, #1e293b, #0f172a);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 32px;
      flex-wrap: wrap;
      gap: 20px;
    }

    .score-left h3 {
      font-size: 1.5rem;
      margin-bottom: 8px;
    }

    .score-stars {
      color: #fbbf24;
      font-size: 1.25rem;
      letter-spacing: 2px;
    }

    .score-badge {
      text-align: center;
      background: rgba(255, 255, 255, 0.1);
      padding: 16px 28px;
      border-radius: 10px;
      border: 1px solid rgba(255, 255, 255, 0.2);
    }

    .score-val {
      font-size: 2.8rem;
      font-weight: 900;
      color: #38bdf8;
      line-height: 1;
    }

    .score-total {
      font-size: 0.9rem;
      color: #94a3b8;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
    }

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }

    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

    .custom-table th {
      background-color: #f1f5f9;
      color: var(--text-dark);
      font-weight: 700;
    }

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

    .highlight-col {
      background-color: #f0fdf4;
      font-weight: 600;
      color: #166534;
    }

    /* FAQ 手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 14px;
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      overflow: hidden;
      transition: all 0.2s ease;
    }

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

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      color: var(--text-dark);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

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

    .faq-icon {
      font-size: 1.2rem;
      font-weight: 400;
      transition: transform 0.3s ease;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 24px;
      color: var(--text-body);
      font-size: 0.95rem;
      line-height: 1.6;
      background-color: #f8fafc;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 24px 20px;
      border-top: 1px solid var(--border-color);
    }

    /* 客户评论卡片 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-stars {
      color: #f59e0b;
      margin-bottom: 12px;
      font-size: 0.9rem;
    }

    .review-text {
      font-size: 0.95rem;
      color: var(--text-body);
      line-height: 1.6;
      margin-bottom: 20px;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }

    .author-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #e2e8f0;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .author-info h4 {
      font-size: 0.95rem;
      color: var(--text-dark);
      font-weight: 700;
    }

    .author-info p {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 表单与联系模块 */
    .form-box {
      background: #ffffff;
      padding: 36px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      background-color: #f8fafc;
      color: var(--text-dark);
      outline: none;
      transition: border-color 0.2s ease;
    }

    .form-control:focus {
      border-color: var(--primary);
      background-color: #ffffff;
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

    .contact-info-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .contact-icon {
      width: 36px;
      height: 36px;
      border-radius: 8px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      flex-shrink: 0;
    }

    /* 媒体图库展示 */
    .media-gallery-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .media-gallery-item {
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      background: #ffffff;
    }

    .media-gallery-item img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

    .media-gallery-item:hover img {
      transform: scale(1.03);
    }

    /* 文章列表 */
    .article-list-wrap {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .article-item-link {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 20px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      color: var(--text-dark);
      font-weight: 500;
      transition: all 0.2s ease;
    }

    .article-item-link:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateX(4px);
    }

    /* 友情链接与页脚 */
    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 0.9rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

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

    .footer-links li a {
      color: #94a3b8;
    }

    .footer-links li a:hover {
      color: #38bdf8;
    }

    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .friend-links-wrap a {
      color: #94a3b8;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.85rem;
    }

    .friend-links-wrap a:hover {
      color: #ffffff;
      background: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      color: #64748b;
      font-size: 0.85rem;
    }

    /* 浮动操作栏 */
    .floating-bar {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .floating-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-lg);
      cursor: pointer;
      border: none;
      transition: transform 0.2s ease, background 0.2s ease;
    }

    .floating-btn:hover {
      transform: scale(1.08);
      background: var(--primary-hover);
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .grid-4, .hero-stats-grid, .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .review-grid, .media-gallery-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 2rem;
      }
      .hero-stats-grid, .grid-4, .grid-3, .grid-2, .review-grid, .media-gallery-grid, .article-list-wrap, .process-timeline {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .section-wrap {
        padding: 50px 0;
      }
      .section-title {
        font-size: 1.6rem;
      }
    }