:root {
      --primary-color: #0284c7;
      --primary-hover: #0369a1;
      --accent-color: #06b6d4;
      --text-main: #0f172a;
      --text-muted: #475569;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --container-max-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
    }

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

    .container {
      max-width: var(--container-max-width);
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* 顶部导航 */
    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);
    }

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

    .brand {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
      color: var(--text-main);
      font-weight: 700;
      font-size: 1.25rem;
    }

    .brand img {
      max-height: 40px;
      width: auto;
      display: block;
    }

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

    .nav-links a {
      text-decoration: none;
      color: var(--text-muted);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 8px 12px;
      transition: color 0.2s ease;
      white-space: nowrap;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-color);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: 6px;
      font-weight: 600;
      font-size: 0.95rem;
      text-decoration: none;
      transition: all 0.2s ease;
      cursor: pointer;
      border: 1px solid transparent;
    }

    .btn-primary {
      background-color: var(--primary-color);
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(2, 132, 199, 0.25);
    }

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

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

    .btn-outline:hover {
      background-color: #f0f9ff;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .mobile-menu-btn span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--text-main);
      margin: 5px 0;
      transition: 0.3s;
    }

    /* 首屏 Hero */
    .hero-section {
      background: linear-gradient(135deg, #f0fdf4 0%, #e0f2fe 50%, #eff6ff 100%);
      padding: 80px 0 60px;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

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

    .hero-tag {
      display: inline-block;
      background: #e0f2fe;
      color: var(--primary-hover);
      padding: 6px 16px;
      border-radius: 20px;
      font-size: 0.875rem;
      font-weight: 600;
      margin-bottom: 20px;
      border: 1px solid #bae6fd;
    }

    .hero-title {
      font-size: 2.5rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.65;
    }

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

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(4px);
      padding: 24px;
      border-radius: 12px;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-color);
    }

    .metric-item {
      text-align: center;
    }

    .metric-number {
      font-size: 1.75rem;
      font-weight: 700;
      color: var(--primary-color);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 0.875rem;
      color: var(--text-muted);
    }

    /* 通用Section */
    .section-block {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 680px;
      margin: 0 auto 48px;
    }

    .section-header h2 {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-header p {
      color: var(--text-muted);
      font-size: 1rem;
    }

    /* 模块卡片布局 */
    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 24px;
      box-shadow: var(--card-shadow);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
    }

    .card h3 {
      font-size: 1.15rem;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .card p {
      color: var(--text-muted);
      font-size: 0.925rem;
      line-height: 1.55;
    }

    /* 平台矩阵标签条 */
    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 14px;
      border-radius: 6px;
      font-size: 0.85rem;
      color: var(--text-main);
      font-weight: 500;
    }

    /* 步骤流程 */
    .step-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .step-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 24px;
      text-align: center;
      position: relative;
    }

    .step-index {
      width: 36px;
      height: 36px;
      background: #e0f2fe;
      color: var(--primary-color);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-weight: 700;
      font-size: 1rem;
    }

    /* 表格 */
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: var(--bg-card);
      border-radius: 8px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }

    .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: #f1f5f9;
      color: var(--text-main);
      font-weight: 600;
    }

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

    .badge-highlight {
      background-color: #dbeafe;
      color: #1e40af;
      padding: 4px 8px;
      border-radius: 4px;
      font-weight: 600;
      font-size: 0.85rem;
    }

    /* 案例展示区图片容器 */
    .media-container {
      width: 100%;
      border-radius: 6px;
      overflow: hidden;
      margin-bottom: 16px;
      background: #f1f5f9;
    }

    .media-container img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    /* 评测分数指示 */
    .rating-highlight {
      background: #eff6ff;
      border-left: 4px solid var(--primary-color);
      padding: 16px 20px;
      border-radius: 4px;
      margin-bottom: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }

    .rating-score {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-color);
    }

    /* FAQ 手风琴 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 6px;
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 20px;
      cursor: pointer;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-main);
      user-select: none;
    }

    .faq-question:hover {
      background-color: #f8fafc;
    }

    .faq-icon {
      font-size: 1.2rem;
      line-height: 1;
      color: var(--primary-color);
      transition: transform 0.2s ease;
    }

    .faq-answer {
      padding: 0 20px 18px;
      color: var(--text-muted);
      font-size: 0.95rem;
      display: none;
      line-height: 1.6;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

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

    /* 评论卡片 */
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
      padding-top: 16px;
      border-top: 1px solid var(--border-color);
    }

    .review-avatar-text {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    .review-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 表单与联系 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 40px;
      box-shadow: var(--card-shadow);
    }

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

    .form-group label {
      display: block;
      margin-bottom: 8px;
      font-weight: 500;
      font-size: 0.9rem;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 0.95rem;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s ease;
    }

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

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

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    .qr-box {
      margin-top: 20px;
      text-align: center;
      display: inline-block;
      padding: 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      background: #fafafa;
    }

    .qr-box img {
      max-width: 140px;
      height: auto;
      display: block;
      margin: 0 auto 8px;
    }

    .qr-box span {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 文章列表 */
    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-link-item {
      background: #f8fafc;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 4px;
      text-decoration: none;
      color: var(--text-main);
      font-size: 0.9rem;
      transition: border-color 0.2s;
    }

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

    /* 页脚 */
    footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 24px;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 16px;
      font-weight: 600;
    }

    .footer-col p {
      font-size: 0.875rem;
      line-height: 1.6;
    }

    .footer-col ul {
      list-style: none;
    }

    .footer-col ul li {
      margin-bottom: 8px;
    }

    .footer-col a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.875rem;
      transition: color 0.2s ease;
    }

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

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }

    .friend-links a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.85rem;
      margin-right: 8px;
    }

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

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

    /* 悬浮客服 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 80px;
      z-index: 999;
      background: var(--primary-color);
      color: #ffffff;
      width: 52px;
      height: 52px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
      cursor: pointer;
      text-decoration: none;
      transition: transform 0.2s;
    }

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

    .floating-kefu svg {
      width: 26px;
      height: 26px;
      fill: #ffffff;
    }

    .back-to-top {
      position: fixed;
      right: 20px;
      bottom: 20px;
      z-index: 999;
      background: #ffffff;
      color: var(--text-main);
      width: 44px;
      height: 44px;
      border-radius: 50%;
      display: none;
      align-items: center;
      justify-content: center;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
      cursor: pointer;
      border: 1px solid var(--border-color);
      transition: opacity 0.2s;
    }

    .back-to-top:hover {
      background: #f1f5f9;
    }

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .card-grid-4,
      .step-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-metrics {
        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: 16px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .card-grid-3,
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }