:root {
      --primary: #028090;
      --primary-light: #00a896;
      --primary-dark: #05668d;
      --accent: #00b4d8;
      --bg-main: #f4f8f8;
      --bg-card: #ffffff;
      --bg-hero: linear-gradient(135deg, #e6f4f4 0%, #f4f8f8 60%, #e0f2f1 100%);
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #cbd5e1;
      --shadow-sm: 0 2px 8px rgba(2, 128, 144, 0.06);
      --shadow-md: 0 6px 20px rgba(2, 128, 144, 0.1);
      --shadow-lg: 0 12px 32px rgba(2, 128, 144, 0.14);
      --radius: 12px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: color 0.2s ease;
    }

    a:hover {
      color: var(--primary-dark);
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(2, 128, 144, 0.12);
      box-shadow: var(--shadow-sm);
    }

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

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

    .brand-logo img {
      max-height: 44px;
      width: auto;
    }

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

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

    .nav-links li {
      margin: 0 2px;
    }

    .nav-links a {
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: 6px;
      transition: all 0.2s ease;
      white-space: nowrap;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      background: rgba(2, 128, 144, 0.08);
    }

    .header-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: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(2, 128, 144, 0.25);
    }

    .btn-primary:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 18px rgba(2, 128, 144, 0.35);
      background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    }

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

    .btn-outline:hover {
      background: rgba(2, 128, 144, 0.06);
      transform: translateY(-1px);
    }

    .nav-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }

    /* 模块通用标题 */
    .section-padding {
      padding: 80px 0;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: rgba(2, 128, 144, 0.1);
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 700;
      border-radius: 20px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* 首屏 Hero - 无图片 */
    .hero-section {
      background: var(--bg-hero);
      padding: 90px 0 80px 0;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid rgba(2, 128, 144, 0.1);
    }

    .hero-body {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid rgba(2, 128, 144, 0.25);
      border-radius: 30px;
      color: var(--primary-dark);
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-h1 {
      font-size: 2.6rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-h1 span {
      background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-light) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-lead {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-ctas {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-md);
      border: 1px solid rgba(2, 128, 144, 0.12);
    }

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

    .stat-num {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* 关于我们 / 平台介绍 */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .intro-card-box {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .intro-list {
      list-style: none;
      margin-top: 20px;
    }

    .intro-list li {
      padding: 10px 0;
      border-bottom: 1px dashed var(--border-color);
      display: flex;
      align-items: flex-start;
      gap: 10px;
      font-size: 0.98rem;
    }

    .intro-list li:last-child {
      border-bottom: none;
    }

    .check-icon {
      color: var(--primary-light);
      font-weight: bold;
    }

    /* 卡片网格 */
    .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: 28px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-light);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: rgba(2, 128, 144, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.3rem;
      margin-bottom: 18px;
    }

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

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      flex: 1;
    }

    /* 支持模型标签云 */
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid rgba(2, 128, 144, 0.2);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary-dark);
      transition: all 0.2s;
    }

    .model-tag:hover {
      background: var(--primary);
      color: #ffffff;
    }

    /* 流程步骤 */
    .timeline {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 14px;
      position: relative;
    }

    .timeline-step {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 20px 14px;
      text-align: center;
      position: relative;
    }

    .step-num {
      width: 32px;
      height: 32px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 12px auto;
      font-size: 0.9rem;
    }

    .step-title {
      font-size: 0.98rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .step-desc {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* 案例展示 */
    .case-card {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
    }

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

    .case-img-wrap {
      width: 100%;
      background: #e2e8f0;
      overflow: hidden;
      aspect-ratio: 16/9;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .case-content {
      padding: 20px;
    }

    .case-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

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

    /* 对比评测 */
    .eval-box {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 32px;
      box-shadow: var(--shadow-md);
    }

    .eval-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding-bottom: 24px;
      margin-bottom: 24px;
      border-bottom: 2px solid var(--bg-main);
      flex-wrap: wrap;
      gap: 16px;
    }

    .rating-badge {
      display: flex;
      align-items: center;
      gap: 12px;
      background: rgba(2, 128, 144, 0.08);
      padding: 12px 20px;
      border-radius: 10px;
    }

    .score-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--primary);
    }

    .stars {
      color: #f59e0b;
      font-size: 1.2rem;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
    }

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

    .eval-table th,
    .eval-table td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .eval-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

    .highlight-cell {
      background: rgba(2, 128, 144, 0.04);
      font-weight: 600;
      color: var(--primary-dark);
    }

    /* 需求匹配 */
    .match-box {
      background: linear-gradient(135deg, #ffffff 0%, #e0f2f1 100%);
      border: 1px solid rgba(2, 128, 144, 0.2);
      border-radius: var(--radius);
      padding: 36px;
    }

    /* Token 比价表格 */
    .token-table-wrap {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .token-table {
      width: 100%;
      border-collapse: collapse;
    }

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

    .token-table th {
      background: #f1f5f9;
      font-weight: 700;
    }

    /* 评论卡片 */
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }

    .user-info .name {
      font-weight: 700;
      font-size: 0.98rem;
    }

    .user-info .role {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .review-text {
      font-size: 0.93rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* FAQ 折叠面板 */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      max-width: 900px;
      margin: 0 auto;
    }

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

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 1.02rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      transition: background 0.2s;
    }

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

    .faq-answer {
      padding: 0 24px 18px 24px;
      font-size: 0.95rem;
      color: var(--text-muted);
      display: none;
      line-height: 1.6;
      border-top: 1px dashed var(--border-color);
      margin-top: 6px;
      padding-top: 14px;
    }

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

    .faq-icon {
      font-weight: bold;
      transition: transform 0.2s;
    }

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

    /* 文章与百科 */
    .article-links {
      display: flex;
      flex-direction: column;
      gap: 12px;
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
    }

    .article-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 12px 0;
      border-bottom: 1px solid #f1f5f9;
    }

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

    /* 表单与联系我们 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .contact-info-card {
      background: #ffffff;
      padding: 36px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .contact-method {
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-item {
      display: flex;
      align-items: center;
      gap: 14px;
      font-size: 0.98rem;
    }

    .qr-box {
      margin-top: 24px;
      text-align: center;
      padding: 16px;
      background: #f8fafc;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      display: inline-block;
    }

    .qr-box img {
      max-width: 140px;
      height: auto;
      border-radius: 6px;
    }

    .form-card {
      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-label {
      display: block;
      font-weight: 600;
      margin-bottom: 8px;
      font-size: 0.92rem;
    }

    .form-input,
    .form-select,
    .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      background: #f8fafc;
      transition: all 0.2s;
    }

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(2, 128, 144, 0.15);
    }

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px 0;
      margin-top: auto;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 18px;
    }

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

    .footer-links a {
      color: #94a3b8;
      font-size: 0.9rem;
    }

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

    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-bottom: 24px;
    }

    .friend-links-title {
      font-size: 0.9rem;
      color: #cbd5e1;
      margin-bottom: 12px;
      font-weight: 600;
    }

    .friend-links-items {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friend-links-items a {
      color: #94a3b8;
      font-size: 0.88rem;
    }

    .friend-links-items a:hover {
      color: var(--primary-light);
    }

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

    /* 浮动客服 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
      cursor: pointer;
      font-size: 1.2rem;
      border: none;
      transition: transform 0.2s;
    }

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

    /* 响应式调整 */
    @media (max-width: 992px) {
      .grid-4, .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .timeline {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
      }
      .intro-grid, .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-stats {
        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.show {
        display: flex;
      }
      .nav-toggle {
        display: block;
      }
      .hero-h1 {
        font-size: 1.9rem;
      }
      .grid-4, .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      .timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }