:root {
      --primary: #ff5722;
      --primary-hover: #f4511e;
      --primary-light: #fff3e0;
      --primary-gradient: linear-gradient(135deg, #ff5722 0%, #ff8a50 100%);
      --accent: #ff9800;
      --dark: #1f2937;
      --text-main: #2b2f38;
      --text-muted: #6b7280;
      --bg-page: #fbfbfd;
      --bg-card: #ffffff;
      --border-color: #f1ede8;
      --shadow-sm: 0 2px 8px rgba(255, 87, 34, 0.06);
      --shadow-md: 0 8px 24px rgba(255, 87, 34, 0.08);
      --shadow-lg: 0 16px 32px rgba(255, 87, 34, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * { 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-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 10% 10%, rgba(255, 87, 34, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(255, 152, 0, 0.03) 0%, transparent 40%);
    }
    a { text-decoration: none; color: inherit; transition: var(--transition); }
    ul { list-style: none; }
    .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }
    
    /* 头部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-wrap { display: flex; align-items: center; gap: 12px; }
    .ai-page-logo { height: 40px; width: auto; object-fit: contain; }
    .brand-title { font-size: 20px; font-weight: 800; color: var(--dark); letter-spacing: -0.5px; }
    .brand-badge { background: var(--primary-light); color: var(--primary); font-size: 11px; padding: 2px 8px; border-radius: 20px; font-weight: 600; }
    .nav-links { display: flex; align-items: center; gap: 0; }
    .nav-links a { font-size: 14px; font-weight: 500; color: var(--dark); padding: 8px 12px; border-radius: 6px; }
    .nav-links a:hover { color: var(--primary); background: var(--primary-light); }
    .header-actions { display: flex; align-items: center; gap: 12px; }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      font-size: 14px;
      font-weight: 600;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--primary-gradient);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(255, 87, 34, 0.25);
    }
    .btn-primary:hover {
      box-shadow: 0 6px 20px rgba(255, 87, 34, 0.35);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: #ffffff;
      color: var(--primary);
      border-color: var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary-light);
    }
    .mobile-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--dark); }

    /* 通用版块规范 */
    .section { padding: 80px 0; }
    .section-alt { background: #ffffff; border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
    .section-header { text-align: center; max-width: 760px; margin: 0 auto 50px auto; }
    .section-tag { display: inline-block; font-size: 12px; font-weight: 700; color: var(--primary); text-transform: uppercase; letter-spacing: 1px; background: var(--primary-light); padding: 4px 14px; border-radius: 20px; margin-bottom: 12px; }
    .section-title { font-size: 32px; font-weight: 800; color: var(--dark); line-height: 1.3; margin-bottom: 14px; letter-spacing: -0.5px; }
    .section-desc { font-size: 16px; color: var(--text-muted); line-height: 1.6; }

    /* 首屏 Hero (无图，纯CSS与数据构建) */
    .hero-section {
      padding: 90px 0 70px;
      background: radial-gradient(circle at 50% 20%, rgba(255, 87, 34, 0.08) 0%, rgba(255, 255, 255, 0) 70%);
      text-align: center;
      position: relative;
    }
    .hero-badge-wrap { display: inline-flex; align-items: center; gap: 8px; background: #ffffff; border: 1px solid #ffd8cc; padding: 6px 16px; border-radius: 30px; box-shadow: var(--shadow-sm); margin-bottom: 24px; }
    .hero-badge-wrap span { font-size: 13px; font-weight: 600; color: var(--primary); }
    .hero-title { font-size: 44px; font-weight: 900; color: var(--dark); line-height: 1.25; margin-bottom: 20px; letter-spacing: -1px; }
    .hero-title .highlight { color: var(--primary); position: relative; display: inline-block; }
    .hero-subtitle { font-size: 18px; color: var(--text-muted); max-width: 820px; margin: 0 auto 36px auto; line-height: 1.6; }
    .hero-cta-group { display: flex; justify-content: center; gap: 16px; margin-bottom: 50px; flex-wrap: wrap; }
    .hero-cta-group .btn-lg { font-size: 16px; padding: 14px 32px; border-radius: var(--radius-md); }
    
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }
    .hero-stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .hero-stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: #ffccbc; }
    .stat-num { font-size: 32px; font-weight: 900; color: var(--primary); margin-bottom: 4px; font-family: Impact, "Arial Black", sans-serif; }
    .stat-label { font-size: 13px; font-weight: 600; color: var(--dark); margin-bottom: 2px; }
    .stat-desc { font-size: 12px; color: var(--text-muted); }

    /* 模型矩阵标签云 */
    .model-tags-section { padding: 30px 0; background: #ffffff; border-bottom: 1px solid var(--border-color); }
    .model-tags-title { text-align: center; font-size: 13px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; margin-bottom: 16px; letter-spacing: 1px; }
    .model-tags-cloud { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
    .model-tag { background: #fafafa; border: 1px solid #ebebeb; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 500; color: var(--dark); transition: var(--transition); }
    .model-tag:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }

    /* 平台介绍 */
    .platform-intro-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .intro-feature-list { display: flex; flex-direction: column; gap: 16px; }
    .intro-feature-item { display: flex; align-items: flex-start; gap: 12px; }
    .intro-feature-icon { background: var(--primary-light); color: var(--primary); width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: bold; flex-shrink: 0; }
    .intro-feature-item strong { display: block; font-size: 15px; color: var(--dark); margin-bottom: 2px; }
    .intro-feature-item p { font-size: 13px; color: var(--text-muted); }

    /* 服务能力卡片 Grid */
    .services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: #ffab91; }
    .service-badge { font-size: 11px; font-weight: 700; color: var(--primary); background: var(--primary-light); padding: 2px 8px; border-radius: 4px; align-self: flex-start; margin-bottom: 12px; }
    .service-card h3 { font-size: 18px; font-weight: 700; color: var(--dark); margin-bottom: 10px; }
    .service-card p { font-size: 14px; color: var(--text-muted); line-height: 1.6; flex-grow: 1; }

    /* 制作场景全家桶 */
    .scenario-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
    .scenario-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      transition: var(--transition);
    }
    .scenario-box:hover { border-color: var(--primary); box-shadow: var(--shadow-md); }
    .scenario-box h4 { font-size: 16px; font-weight: 700; color: var(--dark); margin-bottom: 8px; display: flex; align-items: center; justify-content: space-between; }
    .scenario-box p { font-size: 13px; color: var(--text-muted); line-height: 1.5; }

    /* 标准流程时间线 */
    .process-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; position: relative; }
    .step-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      position: relative;
    }
    .step-num { width: 44px; height: 44px; background: var(--primary-gradient); color: #ffffff; font-size: 18px; font-weight: 800; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 16px auto; box-shadow: 0 4px 10px rgba(255,87,34,0.3); }
    .step-item h4 { font-size: 16px; font-weight: 700; margin-bottom: 8px; color: var(--dark); }
    .step-item p { font-size: 13px; color: var(--text-muted); }

    /* 对比评测专属板块 */
    .eval-highlight-card {
      background: linear-gradient(135deg, #fff7f2 0%, #fff 100%);
      border: 2px solid #ffccbc;
      border-radius: var(--radius-lg);
      padding: 36px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 30px;
    }
    .eval-score-box { text-align: center; flex-shrink: 0; background: #ffffff; padding: 20px 32px; border-radius: var(--radius-md); border: 1px solid #ffd8cc; box-shadow: var(--shadow-sm); }
    .eval-stars { color: #ff9800; font-size: 22px; letter-spacing: 2px; margin-bottom: 4px; }
    .eval-score { font-size: 38px; font-weight: 900; color: var(--primary); font-family: Impact, sans-serif; }
    .eval-score-max { font-size: 14px; color: var(--text-muted); }
    .eval-text-content h3 { font-size: 22px; font-weight: 800; color: var(--dark); margin-bottom: 8px; }
    .eval-text-content p { font-size: 14px; color: var(--text-muted); line-height: 1.6; }
    
    .comparison-table-wrap { overflow-x: auto; background: #ffffff; border-radius: var(--radius-md); border: 1px solid var(--border-color); box-shadow: var(--shadow-sm); }
    .comparison-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 14px; }
    .comparison-table th, .comparison-table td { padding: 16px 20px; border-bottom: 1px solid var(--border-color); }
    .comparison-table th { background: #fafafa; font-weight: 700; color: var(--dark); }
    .comparison-table td.brand-col { background: #fffcf9; font-weight: 600; color: var(--primary); }
    .badge-win { background: #e8f5e9; color: #2e7d32; font-size: 11px; padding: 2px 8px; border-radius: 4px; font-weight: bold; }

    /* 案例中心图文卡片 */
    .case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .case-img-wrap { aspect-ratio: 16/10; width: 100%; overflow: hidden; background: #f0f0f0; }
    .case-img-wrap img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
    .case-card:hover .case-img-wrap img { transform: scale(1.05); }
    .case-body { padding: 20px; flex-grow: 1; display: flex; flex-direction: column; }
    .case-body h4 { font-size: 16px; font-weight: 700; margin-bottom: 8px; color: var(--dark); }
    .case-body p { font-size: 13px; color: var(--text-muted); margin-bottom: 14px; flex-grow: 1; }

    /* Token比价板块 */
    .price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .price-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      text-align: center;
      position: relative;
      transition: var(--transition);
    }
    .price-card.featured { border-color: var(--primary); box-shadow: var(--shadow-lg); transform: translateY(-4px); }
    .price-card-badge { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--primary-gradient); color: #ffffff; font-size: 11px; font-weight: 700; padding: 4px 14px; border-radius: 20px; }
    .price-val { font-size: 32px; font-weight: 900; color: var(--primary); margin: 16px 0; }
    .price-val span { font-size: 14px; color: var(--text-muted); font-weight: normal; }
    .price-features { margin: 20px 0; text-align: left; display: flex; flex-direction: column; gap: 10px; font-size: 13px; color: var(--text-main); }
    .price-features li { display: flex; align-items: center; gap: 8px; }

    /* 用户评论 */
    .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-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-text { font-size: 14px; color: var(--text-main); line-height: 1.6; margin-bottom: 16px; font-style: italic; }
    .review-author { display: flex; align-items: center; gap: 12px; border-top: 1px solid #f5f5f5; padding-top: 12px; }
    .author-avatar { width: 38px; height: 38px; border-radius: 50%; background: var(--primary-light); color: var(--primary); font-weight: bold; display: flex; align-items: center; justify-content: center; font-size: 14px; }
    .author-info h5 { font-size: 14px; font-weight: 700; color: var(--dark); }
    .author-info span { font-size: 12px; color: var(--text-muted); }

    /* FAQ 折叠面板 */
    .faq-list { 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-sm);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      width: 100%;
      padding: 18px 24px;
      text-align: left;
      background: none;
      border: none;
      font-size: 15px;
      font-weight: 700;
      color: var(--dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-question:hover { color: var(--primary); }
    .faq-icon { font-size: 16px; transition: transform 0.3s ease; color: var(--primary); }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.6;
    }
    .faq-item.active { border-color: #ffccbc; }
    .faq-item.active .faq-icon { transform: rotate(45deg); }
    .faq-item.active .faq-answer { max-height: 500px; padding: 0 24px 20px 24px; }

    /* 资讯中心与文章 */
    .articles-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 30px; }
    .article-lead-card { background: #ffffff; border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 30px; box-shadow: var(--shadow-sm); }
    .article-links-list { display: flex; flex-direction: column; gap: 12px; }
    .article-link-item {
      padding: 14px 18px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 14px;
      color: var(--dark);
      font-weight: 500;
      transition: var(--transition);
    }
    .article-link-item:hover { border-color: var(--primary); color: var(--primary); background: #fffaf7; transform: translateX(4px); }

    /* 智能需求匹配与表单 */
    .contact-form-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
      max-width: 860px;
      margin: 0 auto;
    }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
    .form-group-full { grid-column: span 2; }
    .form-label { display: block; font-size: 13px; font-weight: 600; color: var(--dark); margin-bottom: 8px; }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 14px;
      border: 1px solid #d1d5db;
      border-radius: var(--radius-sm);
      outline: none;
      transition: var(--transition);
      background: #fafafa;
    }
    .form-control:focus { border-color: var(--primary); background: #ffffff; box-shadow: 0 0 0 3px rgba(255, 87, 34, 0.15); }
    textarea.form-control { resize: vertical; min-height: 100px; }

    /* 底部专属统一规范 */
    .site-footer {
      background: #191c21;
      color: #9ca3af;
      padding: 60px 0 30px 0;
      border-top: 1px solid #2d333b;
      font-size: 14px;
    }
    .footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 40px; }
    .footer-col h4 { color: #ffffff; font-size: 16px; font-weight: 700; margin-bottom: 18px; }
    .footer-col p { line-height: 1.6; margin-bottom: 12px; }
    .footer-links-col { display: flex; flex-direction: column; gap: 8px; }
    .footer-links-col a { color: #9ca3af; }
    .footer-links-col a:hover { color: var(--primary); }
    .footer-qr-wrap { display: flex; align-items: center; gap: 14px; }
    .footer-qr-wrap img { width: 90px; height: 90px; border-radius: var(--radius-sm); background: #fff; padding: 4px; }
    .friend-links-bar { border-top: 1px solid #262c35; border-bottom: 1px solid #262c35; padding: 18px 0; margin-bottom: 24px; display: flex; flex-wrap: wrap; gap: 14px; align-items: center; font-size: 13px; }
    .friend-links-bar span { color: #ffffff; font-weight: 600; }
    .friend-links-bar a { color: #9ca3af; }
    .friend-links-bar a:hover { color: var(--primary); }
    .footer-bottom { text-align: center; font-size: 12px; color: #6b7280; }

    /* 悬浮客服 */
    .float-kefu {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      background: var(--primary-gradient);
      color: #ffffff;
      padding: 12px 18px;
      border-radius: 30px;
      box-shadow: 0 8px 24px rgba(255, 87, 34, 0.4);
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
    }
    .float-kefu:hover { transform: scale(1.05); }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-title { font-size: 34px; }
      .hero-stats-grid, .services-grid, .scenario-grid, .process-steps, .case-grid, .price-grid, .reviews-grid { grid-template-columns: repeat(2, 1fr); }
      .platform-intro-card, .eval-highlight-card, .articles-grid, .footer-grid { grid-template-columns: 1fr; }
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
    }
    @media (max-width: 640px) {
      .hero-title { font-size: 26px; }
      .hero-stats-grid, .services-grid, .scenario-grid, .process-steps, .case-grid, .price-grid, .reviews-grid, .form-grid { grid-template-columns: 1fr; }
      .form-group-full { grid-column: span 1; }
      .section { padding: 50px 0; }
      .eval-highlight-card { flex-direction: column; text-align: center; }
    }