:root {
      --primary-color: #2563eb;
      --primary-light: #60a5fa;
      --secondary-color: #7c3aed;
      --accent-coral: #f43f5e;
      --accent-emerald: #10b981;
      --accent-amber: #f59e0b;
      --accent-cyan: #06b6d4;
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-light: #e2e8f0;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 20px 35px -10px rgba(37, 99, 235, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-max: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      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;
    }

    body {
      background: radial-gradient(circle at 10% 10%, rgba(96, 165, 250, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 90% 20%, rgba(124, 58, 237, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 50% 80%, rgba(16, 185, 129, 0.06) 0%, transparent 50%),
                  var(--bg-page);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .brand-title {
      font-size: 20px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      text-decoration: none;
      transition: color 0.2s ease, background-color 0.2s ease;
      border-radius: var(--radius-sm);
    }
    .nav-links li a:hover {
      color: var(--primary-color);
      background-color: rgba(37, 99, 235, 0.05);
    }
    .nav-cta-group {
      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: 50px;
      text-decoration: none;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      cursor: pointer;
      border: 1px solid transparent;
    }
    .btn-primary {
      background: linear-gradient(135deg, #2563eb, #7c3aed);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(124, 58, 237, 0.4);
      color: #ffffff;
    }
    .btn-secondary {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-light);
    }
    .btn-secondary:hover {
      background: #f1f5f9;
      color: var(--primary-color);
      border-color: var(--primary-light);
    }
    .btn-rainbow {
      background: linear-gradient(135deg, #ec4899, #8b5cf6, #3b82f6);
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(236, 72, 153, 0.3);
    }
    .btn-rainbow:hover {
      transform: translateY(-2px) scale(1.02);
      box-shadow: 0 8px 25px rgba(139, 92, 246, 0.45);
      color: #ffffff;
    }

    /* 汉堡菜单 */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* Hero 首屏 (无图模式) */
    .hero-section {
      padding: 80px 0 60px;
      position: relative;
      overflow: hidden;
      text-align: center;
    }
    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: linear-gradient(90deg, rgba(236, 72, 153, 0.1), rgba(59, 130, 246, 0.1));
      border: 1px solid rgba(139, 92, 246, 0.25);
      border-radius: 50px;
      font-size: 14px;
      font-weight: 600;
      color: var(--secondary-color);
      margin-bottom: 24px;
    }
    .hero-badge-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10b981;
      box-shadow: 0 0 10px #10b981;
    }
    .hero-title {
      font-size: 44px;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title .gradient-text {
      background: linear-gradient(135deg, #2563eb 0%, #ec4899 50%, #7c3aed 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      max-width: 820px;
      margin: 0 auto 36px;
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1040px;
      margin: 0 auto;
    }
    .stat-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      position: relative;
      overflow: hidden;
    }
    .stat-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
    }
    .stat-card:nth-child(1)::before { background: linear-gradient(90deg, #3b82f6, #06b6d4); }
    .stat-card:nth-child(2)::before { background: linear-gradient(90deg, #ec4899, #f43f5e); }
    .stat-card:nth-child(3)::before { background: linear-gradient(90deg, #8b5cf6, #6366f1); }
    .stat-card:nth-child(4)::before { background: linear-gradient(90deg, #10b981, #84cc16); }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .stat-num {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 通用区块 */
    .section-wrap {
      padding: 70px 0;
    }
    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }
    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: rgba(37, 99, 235, 0.08);
      color: var(--primary-color);
      border-radius: 50px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }
    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
    }

    /* 斑斓彩调模型胶囊 */
    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-bottom: 40px;
    }
    .model-pill {
      padding: 8px 18px;
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: 50px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: all 0.25s ease;
    }
    .model-pill span {
      width: 8px;
      height: 8px;
      border-radius: 50%;
    }
    .model-pill:hover {
      border-color: var(--secondary-color);
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(124, 58, 237, 0.15);
    }

    /* 场景卡片矩阵网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
      gap: 24px;
    }
    .feature-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 26px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      position: relative;
    }
    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: rgba(37, 99, 235, 0.3);
    }
    .feature-icon-badge {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 18px;
      background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(124, 58, 237, 0.1));
      color: var(--primary-color);
    }
    .feature-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      flex-grow: 1;
    }
    .feature-footer-tag {
      margin-top: 16px;
      font-size: 12px;
      font-weight: 600;
      color: var(--secondary-color);
    }

    /* 对比评测卡片 */
    .review-score-banner {
      background: linear-gradient(135deg, #eff6ff, #faf5ff);
      border: 2px solid rgba(124, 58, 237, 0.2);
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
      margin-bottom: 36px;
      box-shadow: var(--shadow-md);
    }
    .score-left h3 {
      font-size: 24px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .star-rating {
      color: #f59e0b;
      font-size: 20px;
      letter-spacing: 2px;
    }
    .score-badge {
      text-align: right;
    }
    .score-big {
      font-size: 48px;
      font-weight: 900;
      color: var(--primary-color);
      line-height: 1;
    }
    .score-max {
      font-size: 16px;
      color: var(--text-muted);
    }

    /* 对比表格 */
    .compare-table-wrap {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    .compare-table th, .compare-table td {
      padding: 18px 22px;
      border-bottom: 1px solid var(--border-light);
      font-size: 14px;
    }
    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }
    .compare-table th.highlight-col, .compare-table td.highlight-col {
      background: rgba(37, 99, 235, 0.03);
      font-weight: 600;
      color: var(--primary-color);
      border-left: 1px solid rgba(37, 99, 235, 0.15);
      border-right: 1px solid rgba(37, 99, 235, 0.15);
    }

    /* 流程步骤 */
    .workflow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .step-item {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-light);
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
      font-size: 15px;
    }
    .step-item h4 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-item p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 案例素材图库展示 */
    .gallery-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 20px;
      margin-top: 24px;
    }
    .gallery-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      background: #ffffff;
      transition: transform 0.3s ease;
    }
    .gallery-item:hover {
      transform: translateY(-4px);
    }
    .gallery-item img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }
    .banner-strip {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }
    .banner-strip img {
      width: 100%;
      height: auto;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-light);
    }

    /* 客户评价 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-content {
      font-size: 14px;
      color: var(--text-main);
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-light);
      padding-top: 16px;
    }
    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, #a78bfa, #38bdf8);
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
    }
    .author-meta h5 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }
    .author-meta span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* FAQ 手风琴 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      overflow: hidden;
      transition: all 0.25s ease;
    }
    .faq-question {
      padding: 20px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 700;
      font-size: 16px;
      color: var(--text-main);
      user-select: none;
    }
    .faq-toggle-icon {
      font-size: 18px;
      transition: transform 0.25s ease;
      color: var(--primary-color);
    }
    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }
    .faq-item.active {
      border-color: rgba(37, 99, 235, 0.3);
      box-shadow: var(--shadow-sm);
    }
    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }

    /* 需求匹配与表单 */
    .form-container {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid var(--border-light);
      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 {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group.full-width {
      grid-column: span 2;
    }
    .form-group label {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
    }
    .form-control {
      padding: 12px 16px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      font-size: 14px;
      background: #f8fafc;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s ease, background 0.2s ease;
      font-family: inherit;
    }
    .form-control:focus {
      border-color: var(--primary-color);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    }

    /* 资讯列表 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 16px;
      margin-top: 24px;
    }
    .news-card {
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      text-decoration: none;
      color: var(--text-main);
      transition: all 0.25s ease;
      display: block;
    }
    .news-card:hover {
      border-color: var(--primary-color);
      transform: translateY(-3px);
      box-shadow: var(--shadow-sm);
    }
    .news-card h4 {
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .news-card span {
      font-size: 12px;
      color: var(--primary-color);
      font-weight: 600;
    }

    /* 底部页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-light);
      padding: 60px 0 30px;
      margin-top: auto;
      color: var(--text-main);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 18px;
      color: var(--text-main);
    }
    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links-list a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 14px;
      transition: color 0.2s ease;
    }
    .footer-links-list a:hover {
      color: var(--primary-color);
    }
    .qr-box {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .qr-box img {
      width: 100px;
      height: 100px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-light);
      padding: 4px;
      background: #ffffff;
    }
    .qr-info {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }
    .friendly-links {
      border-top: 1px solid var(--border-light);
      padding: 24px 0;
      font-size: 13px;
      color: var(--text-muted);
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 12px;
    }
    .friendly-links a {
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s;
    }
    .friendly-links a:hover {
      color: var(--primary-color);
    }
    .footer-bottom {
      border-top: 1px solid #f1f5f9;
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 浮动客服与返回顶部 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 99;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary-color);
      font-size: 20px;
      text-decoration: none;
      transition: all 0.3s ease;
    }
    .float-btn:hover {
      background: var(--primary-color);
      color: #ffffff;
      transform: translateY(-3px);
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .hero-stats-grid, .workflow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .gallery-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 30px;
      }
      .mobile-menu-btn {
        display: block;
      }
      .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-light);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-cta-group {
        display: none;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full-width {
        grid-column: span 1;
      }
      .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .banner-strip {
        grid-template-columns: repeat(2, 1fr);
      }
    }