:root {
      --primary: #2563eb;
      --primary-dark: #1d4ed8;
      --accent: #f97316;
      --gradient-brand: linear-gradient(135deg, #2563eb 0%, #7c3aed 50%, #f97316 100%);
      --gradient-light: linear-gradient(180deg, #f0f7ff 0%, #ffffff 100%);
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(37, 99, 235, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
      --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, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-group {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .brand-group .logo-wrap {
      max-width: 160px;
      display: flex;
      align-items: center;
    }
    .ai-page-home-link {
      font-weight: 600;
      color: var(--primary);
      padding: 6px 12px;
      background: #eff6ff;
      border-radius: 6px;
      font-size: 14px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: 6px;
      transition: all 0.2s;
    }
    .nav-links li a:hover {
      color: var(--primary);
      background: #f1f5f9;
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 15px;
      font-weight: 600;
      border-radius: 8px;
      transition: all 0.25s ease;
      cursor: pointer;
      border: 1px solid transparent;
      line-height: 1.2;
    }
    .btn-primary {
      background: var(--gradient-brand);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
    }
    .btn-primary:hover {
      opacity: 0.92;
      transform: translateY(-1px);
      box-shadow: 0 6px 18px rgba(37, 99, 235, 0.4);
    }
    .btn-secondary {
      background: #ffffff;
      color: var(--primary);
      border-color: #cbd5e1;
    }
    .btn-secondary:hover {
      background: #f8fafc;
      border-color: var(--primary);
    }
    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 统一 Section */
    section {
      padding: 80px 0;
    }
    .section-title-wrap {
      text-align: center;
      margin-bottom: 50px;
    }
    .badge {
      display: inline-block;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      background: #e0f2fe;
      border-radius: 999px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto;
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 90px 0 80px;
      background: radial-gradient(circle at 50% 20%, #e0e7ff 0%, #f8fafc 70%);
      position: relative;
    }
    .hero-content {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }
    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid #bfdbfe;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }
    h1.hero-heading {
      font-size: 42px;
      font-weight: 900;
      line-height: 1.25;
      color: #0f172a;
      margin-bottom: 24px;
      letter-spacing: -0.8px;
    }
    .hero-sub {
      font-size: 18px;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 40px;
    }
    .hero-features {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 20px;
    }
    .feature-pill {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 18px;
      border-radius: 50px;
      font-size: 13px;
      font-weight: 500;
      color: var(--text-muted);
      box-shadow: var(--shadow-sm);
    }

    /* 数据指标 */
    .stats-bar {
      margin-top: 50px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 30px;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    .stat-item {
      text-align: center;
    }
    .stat-val {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .stat-lab {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 平台介绍 */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
    }
    .intro-text p {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 20px;
    }
    .intro-specs {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .spec-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px;
      box-shadow: var(--shadow-sm);
    }
    .spec-box h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .spec-box p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
      margin-bottom: 0;
    }

    /* 模型矩阵云 */
    .model-tags-wrap {
      background: #ffffff;
      padding: 30px;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }
    .model-tag {
      padding: 8px 16px;
      background: #f1f5f9;
      color: #334155;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 600;
      border: 1px solid #e2e8f0;
      transition: all 0.2s;
    }
    .model-tag:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    /* 场景卡片网格 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }
    .card-icon {
      width: 44px;
      height: 44px;
      background: #eff6ff;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 800;
      font-size: 18px;
      margin-bottom: 18px;
    }
    .card h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 流程步骤 */
    .steps-wrapper {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 24px;
      border-radius: var(--radius);
      position: relative;
    }
    .step-index {
      font-size: 28px;
      font-weight: 900;
      color: #93c5fd;
      margin-bottom: 8px;
    }
    .step-box h3 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-box p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 素材展示区 */
    .media-showcase {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      margin-top: 30px;
    }
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .media-card-body {
      padding: 20px;
    }
    .media-card-body h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .media-card-body p {
      font-size: 13px;
      color: var(--text-muted);
    }
    .media-box {
      width: 100%;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }
    .media-box img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    /* 对比表格 */
    .table-container {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }
    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 640px;
    }
    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }
    .custom-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }
    .custom-table tr:last-child td {
      border-bottom: none;
    }
    .highlight-cell {
      background: #eff6ff;
      color: var(--primary);
      font-weight: 700;
    }

    /* 评测卡片 */
    .eval-card {
      background: linear-gradient(135deg, #eff6ff 0%, #ffffff 100%);
      border: 2px solid #bfdbfe;
      border-radius: var(--radius);
      padding: 30px;
      margin-top: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }
    .eval-score-box {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .score-num {
      font-size: 46px;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }
    .score-meta {
      font-size: 14px;
      color: var(--text-muted);
    }
    .score-stars {
      color: #f59e0b;
      font-size: 18px;
      margin-bottom: 4px;
    }

    /* 需求匹配与表单 */
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 40px;
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .form-group.full {
      grid-column: span 2;
    }
    .form-group label {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      font-size: 14px;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    }
    .form-textarea {
      resize: vertical;
      min-height: 100px;
    }

    /* FAQ 折叠面板 */
    .faq-grid {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }
    .faq-question::after {
      content: "+";
      font-size: 20px;
      color: var(--primary);
      transition: transform 0.25s ease;
    }
    .faq-item.active .faq-question::after {
      transform: rotate(45deg);
    }
    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* 用户评论卡片 */
    .reviews-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;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: var(--shadow-sm);
    }
    .review-body {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      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: 15px;
    }
    .author-info h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }
    .author-info p {
      font-size: 12px;
      color: #64748b;
    }

    /* 文章列表 & 宣传横幅 */
    .article-section {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      margin-top: 30px;
    }
    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }
    .article-link-item {
      padding: 8px 14px;
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 13px;
      color: var(--text-muted);
      transition: all 0.2s;
    }
    .article-link-item:hover {
      color: var(--primary);
      border-color: var(--primary);
      background: #eff6ff;
    }
    .banner-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 30px;
    }
    .banner-box {
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      background: #ffffff;
    }
    .banner-box img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* 加盟代理 */
    .agent-card {
      background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
      color: #ffffff;
      border-radius: 16px;
      padding: 50px 40px;
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 30px;
      align-items: center;
    }
    .agent-text h3 {
      font-size: 28px;
      font-weight: 800;
      margin-bottom: 14px;
      color: #f8fafc;
    }
    .agent-text p {
      font-size: 15px;
      color: #94a3b8;
      line-height: 1.7;
      margin-bottom: 24px;
    }
    .agent-box {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius);
      padding: 24px;
      text-align: center;
    }

    /* 页脚与联系方式 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      font-size: 15px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 18px;
    }
    .footer-col p, .footer-col ul {
      font-size: 13px;
      line-height: 1.8;
      list-style: none;
    }
    .footer-col ul li a {
      color: #94a3b8;
    }
    .footer-col ul li a:hover {
      color: #ffffff;
    }
    .qr-wrap {
      max-width: 120px;
      border-radius: 8px;
      overflow: hidden;
      background: #ffffff;
      padding: 6px;
      margin-top: 10px;
    }
    .qr-wrap img {
      width: 100%;
      height: auto;
      display: block;
    }
    .friend-links {
      border-top: 1px solid #1e293b;
      padding: 20px 0;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      font-size: 13px;
    }
    .friend-links span {
      color: #64748b;
    }
    .friend-links a {
      color: #94a3b8;
    }
    .friend-links a:hover {
      color: #ffffff;
    }
    .copyright-bar {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      font-size: 12px;
      color: #64748b;
      text-align: center;
    }

    /* 浮动客服 */
    .float-kefu {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 99;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 50px;
      padding: 10px 18px;
      box-shadow: var(--shadow-lg);
      display: flex;
      align-items: center;
      gap: 10px;
      cursor: pointer;
      transition: all 0.25s;
    }
    .float-kefu:hover {
      transform: translateY(-3px);
      box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
    }
    .kefu-dot {
      width: 10px;
      height: 10px;
      background: #22c55e;
      border-radius: 50%;
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .cards-grid, .reviews-grid, .banner-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-wrapper, .stats-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .agent-card {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      h1.hero-heading {
        font-size: 30px;
      }
      .cards-grid, .reviews-grid, .banner-grid, .intro-grid, .steps-wrapper, .stats-bar, .media-showcase {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full {
        grid-column: span 1;
      }
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        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-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
      }
      .header-actions {
        display: none;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }