:root {
      --primary-color: #0d9488;
      --primary-hover: #0f766e;
      --primary-light: #f0fdfa;
      --mint-accent: #2dd4bf;
      --mint-border: #99f6e4;
      --mint-soft: #ccfbf1;
      --text-main: #134e4a;
      --text-body: #334155;
      --text-muted: #64748b;
      --bg-page: #f7fdfb;
      --bg-card: #ffffff;
      --shadow-sm: 0 1px 3px rgba(13, 148, 136, 0.06);
      --shadow-md: 0 4px 14px rgba(13, 148, 136, 0.08);
      --shadow-lg: 0 10px 25px -3px rgba(13, 148, 136, 0.12);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --transition: all 0.25s ease-in-out;
    }

    * {
      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: var(--transition);
    }

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

    .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(--mint-border);
      box-shadow: var(--shadow-sm);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

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

    .nav-brand .ai-page-logo {
      height: 40px;
      width: auto;
    }

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

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

    .nav-links a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-body);
      border-radius: var(--radius-sm);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-color);
      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 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background-color: var(--primary-color);
      color: #ffffff;
      box-shadow: 0 4px 10px rgba(13, 148, 136, 0.2);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 6px 14px rgba(13, 148, 136, 0.28);
      color: #ffffff;
      transform: translateY(-1px);
    }

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

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

    .btn-large {
      padding: 14px 32px;
      font-size: 1.05rem;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 通用分节样式 */
    .section {
      padding: 70px 0;
      border-bottom: 1px solid rgba(153, 246, 228, 0.4);
    }

    .section-alt {
      background-color: #ffffff;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

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

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 90px 0 80px;
      background: radial-gradient(100% 100% at 50% 0%, #ccfbf1 0%, #f0fdfa 60%, var(--bg-page) 100%);
      position: relative;
      overflow: hidden;
    }

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

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid var(--mint-border);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.9rem;
      color: var(--primary-color);
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-badge .dot {
      width: 8px;
      height: 8px;
      background-color: var(--mint-accent);
      border-radius: 50%;
      display: inline-block;
    }

    .hero-title {
      font-size: 2.6rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-body);
      margin-bottom: 36px;
      line-height: 1.7;
    }

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

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      padding: 24px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--mint-border);
      box-shadow: var(--shadow-md);
    }

    .stat-item {
      text-align: center;
      padding: 10px;
    }

    .stat-value {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary-color);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 平台矩阵 */
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-tag {
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid var(--mint-border);
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 500;
      color: var(--text-main);
      transition: var(--transition);
    }

    .model-tag:hover {
      background: var(--primary-light);
      border-color: var(--primary-color);
      transform: translateY(-2px);
    }

    /* 网格卡片 */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .card {
      background: var(--bg-card);
      border: 1px solid var(--mint-border);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }

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

    .card-icon-wrap {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      color: var(--primary-color);
      font-size: 1.4rem;
      font-weight: bold;
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

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

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

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

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary-color);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-bottom: 16px;
    }

    /* 评测与对比表格 */
    .rating-banner {
      background: linear-gradient(135deg, var(--primary-light) 0%, #ffffff 100%);
      border: 1px solid var(--mint-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }

    .rating-score-box {
      display: flex;
      align-items: baseline;
      gap: 12px;
    }

    .rating-score {
      font-size: 3rem;
      font-weight: 800;
      color: var(--primary-color);
      line-height: 1;
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 1.3rem;
      font-weight: bold;
    }

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

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

    .custom-table th,
    .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f5f9;
      font-size: 0.95rem;
    }

    .custom-table th {
      background: var(--primary-light);
      color: var(--text-main);
      font-weight: 700;
    }

    .custom-table tr:hover td {
      background-color: #f8fafc;
    }

    .highlight-col {
      background-color: rgba(240, 253, 250, 0.6);
      font-weight: 600;
      color: var(--primary-color);
    }

    /* 案例展示 */
    .media-card {
      background: #ffffff;
      border: 1px solid var(--mint-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .media-img-wrap {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background-color: #e2e8f0;
    }

    .media-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .media-body {
      padding: 20px;
    }

    /* FAQ 折叠 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-card {
      background: #ffffff;
      border: 1px solid var(--mint-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      background: #ffffff;
    }

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

    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary-color);
      transition: transform 0.25s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background-color: #fbfdfc;
    }

    .faq-answer-inner {
      padding: 0 24px 20px;
      color: var(--text-body);
      font-size: 0.95rem;
      line-height: 1.6;
    }

    .faq-card.open .faq-icon {
      transform: rotate(45deg);
    }

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

    .review-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
      padding-top: 14px;
      border-top: 1px solid #f1f5f9;
    }

    .review-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--mint-soft);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    .review-info h4 {
      font-size: 0.95rem;
      color: var(--text-main);
      margin-bottom: 2px;
    }

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

    /* 表单与联系模块 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      background: #ffffff;
      border: 1px solid var(--mint-border);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
      margin-top: 24px;
    }

    .contact-info-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
    }

    .contact-qr {
      margin-top: 20px;
      width: 140px;
      height: 140px;
      padding: 6px;
      background: #ffffff;
      border: 1px solid var(--mint-border);
      border-radius: var(--radius-sm);
    }

    .contact-qr img {
      width: 100%;
      height: 100%;
      object-fit: contain;
    }

    .form-group {
      margin-bottom: 18px;
    }

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

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background-color: #ffffff;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary-color);
      box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
    }

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

    /* 资讯列表 */
    .article-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 20px;
    }

    .article-tag-link {
      display: inline-block;
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid var(--mint-border);
      border-radius: var(--radius-sm);
      font-size: 0.9rem;
      color: var(--text-body);
      transition: var(--transition);
    }

    .article-tag-link:hover {
      background: var(--primary-light);
      color: var(--primary-color);
      border-color: var(--primary-color);
    }

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 0.9rem;
      border-top: 3px solid var(--primary-color);
    }

    .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;
      margin-bottom: 18px;
    }

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

    .footer-col ul a:hover {
      color: var(--mint-accent);
    }

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

    .footer-friend-links a {
      color: #cbd5e1;
      padding: 4px 10px;
      background: rgba(255, 255, 255, 0.05);
      border-radius: 4px;
      font-size: 0.85rem;
    }

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

    .footer-bottom {
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

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

    .floating-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary-color);
      border: 1px solid var(--mint-border);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 1.2rem;
      transition: var(--transition);
    }

    .floating-btn:hover {
      background: var(--primary-color);
      color: #ffffff;
      transform: scale(1.05);
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .grid-4, .step-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 1px solid var(--mint-border);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
      .nav-actions {
        display: none;
      }
      .hero-title {
        font-size: 2rem;
      }
      .grid-2, .grid-3, .grid-4, .step-list {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        align-items: flex-start;
      }
    }