:root {
      --bg-primary: #f8fafc;
      --bg-surface: #ffffff;
      --bg-glass: rgba(255, 255, 255, 0.85);
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --neon-cyan: #00d2ff;
      --neon-purple: #7000ff;
      --neon-pink: #ff007f;
      --neon-green: #00e676;
      --border-color: #e2e8f0;
      --shadow-glow: 0 10px 30px rgba(112, 0, 255, 0.08);
      --radius: 12px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-primary);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 10% 20%, rgba(0, 210, 255, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(112, 0, 255, 0.05) 0%, transparent 40%);
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* 顶部导航 */
    header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: var(--bg-glass);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    }

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

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

    .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

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

    .nav-links a {
      color: var(--text-main);
      text-decoration: none;
      font-weight: 500;
      padding: 8px 14px;
      font-size: 14px;
      transition: var(--transition);
      border-radius: 6px;
    }

    .nav-links a:hover {
      color: var(--neon-purple);
      background: rgba(112, 0, 255, 0.05);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 8px;
      text-decoration: none;
      transition: var(--transition);
      cursor: pointer;
      border: none;
    }

    .btn-neon {
      background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(112, 0, 255, 0.25);
    }

    .btn-neon:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 210, 255, 0.4);
      color: #ffffff;
    }

    .btn-outline {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
    }

    .btn-outline:hover {
      border-color: var(--neon-purple);
      color: var(--neon-purple);
      background: rgba(112, 0, 255, 0.02);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 80px 0 60px;
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      background: linear-gradient(135deg, rgba(0, 210, 255, 0.1), rgba(112, 0, 255, 0.1));
      border: 1px solid rgba(112, 0, 255, 0.2);
      border-radius: 50px;
      font-size: 13px;
      font-weight: 600;
      color: var(--neon-purple);
      margin-bottom: 24px;
    }

    .hero-section h1 {
      font-size: 42px;
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: var(--text-main);
      line-height: 1.25;
    }

    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 60px;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      padding: 30px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-glow);
    }

    .stat-item h3 {
      font-size: 32px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 4px;
    }

    .stat-item p {
      font-size: 14px;
      color: var(--text-light);
    }

    /* 板块通用 */
    .section-padding {
      padding: 70px 0;
    }

    .section-header {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 50px;
    }

    .section-header h2 {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 12px;
      position: relative;
      display: inline-block;
    }

    .section-header p {
      font-size: 15px;
      color: var(--text-muted);
    }

    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }

    .card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      transition: var(--transition);
      position: relative;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-glow);
      border-color: rgba(112, 0, 255, 0.3);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: linear-gradient(135deg, rgba(0, 210, 255, 0.1), rgba(112, 0, 255, 0.1));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 18px;
      color: var(--neon-purple);
    }

    .card h3 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 10px;
    }

    .card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 标签云与模型展示 */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 20px;
    }

    .tag-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 500;
      color: var(--text-main);
      transition: var(--transition);
    }

    .tag-item:hover {
      border-color: var(--neon-cyan);
      color: var(--neon-purple);
      box-shadow: 0 2px 10px rgba(0, 210, 255, 0.15);
    }

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

    .process-step {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      position: relative;
    }

    .step-number {
      font-size: 12px;
      font-weight: 800;
      color: var(--neon-cyan);
      background: rgba(0, 210, 255, 0.1);
      display: inline-block;
      padding: 4px 10px;
      border-radius: 4px;
      margin-bottom: 12px;
    }

    /* 对比表格 */
    .table-responsive {
      overflow-x: auto;
      background: var(--bg-surface);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-glow);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

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

    .compare-table th {
      background: #f1f5f9;
      font-weight: 600;
    }

    .compare-table tr.highlight {
      background: rgba(112, 0, 255, 0.03);
    }

    .compare-table tr.highlight td {
      font-weight: 600;
      color: var(--neon-purple);
    }

    /* 评测分数卡片 */
    .rating-banner {
      background: linear-gradient(135deg, rgba(0, 210, 255, 0.08), rgba(112, 0, 255, 0.08));
      border: 1px solid rgba(112, 0, 255, 0.2);
      border-radius: var(--radius);
      padding: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
    }

    .rating-score {
      font-size: 36px;
      font-weight: 900;
      color: var(--neon-purple);
    }

    /* 素材与案例 */
    .media-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
    }

    .media-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
    }

    .media-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }

    .media-card-body {
      padding: 16px;
    }

    /* 评论卡片 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 20px;
    }

    .review-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
    }

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

    .avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: bold;
    }

    /* 表单样式 */
    .form-wrapper {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-glow);
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 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;
    }

    .form-group input, .form-group select, .form-group textarea {
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 14px;
      outline: none;
      transition: var(--transition);
      background: #fafafa;
    }

    .form-group input:focus, .form-group select:focus, .form-group textarea:focus {
      border-color: var(--neon-purple);
      box-shadow: 0 0 0 3px rgba(112, 0, 255, 0.1);
      background: #ffffff;
    }

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

    .faq-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-question::after {
      content: "+";
      font-size: 20px;
      color: var(--neon-purple);
      transition: var(--transition);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 14px;
    }

    .faq-item.active .faq-answer {
      padding: 0 24px 20px;
      max-height: 300px;
    }

    /* 友情链接与文章 */
    .links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      padding: 20px;
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
    }

    .links-box a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 13px;
      transition: var(--transition);
    }

    .links-box a:hover {
      color: var(--neon-purple);
    }

    /* 页脚 */
    footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      margin-top: 80px;
      font-size: 14px;
    }

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

    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      font-weight: 600;
      margin-bottom: 16px;
    }

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

    .footer-col a {
      color: #94a3b8;
      text-decoration: none;
      transition: var(--transition);
    }

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

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
    }

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

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
      cursor: pointer;
      text-decoration: none;
      font-size: 20px;
      transition: var(--transition);
      position: relative;
    }

    .float-btn:hover {
      transform: scale(1.1);
    }

    .qr-popover {
      display: none;
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 12px;
      box-shadow: 0 10px 25px rgba(0,0,0,0.15);
      border: 1px solid var(--border-color);
      width: 140px;
      text-align: center;
    }

    .qr-popover img {
      width: 100%;
      height: auto;
      border-radius: 6px;
    }

    .float-btn:hover .qr-popover {
      display: block;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-stats, .process-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full {
        grid-column: span 1;
      }
    }

    @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: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .hero-section h1 {
        font-size: 28px;
      }
      .hero-stats, .process-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        text-align: center;
        gap: 16px;
      }
    }