:root {
      --bg-base: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --text-main: #0f172a;
      --text-sub: #475569;
      --text-muted: #64748b;
      --neon-cyan: #06b6d4;
      --neon-purple: #8b5cf6;
      --neon-pink: #ec4899;
      --neon-blue: #3b82f6;
      --neon-emerald: #10b981;
      --neon-amber: #f59e0b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 20px rgba(139,92,246,0.08);
      --shadow-hover: 0 12px 32px rgba(6,182,212,0.15);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-family: var(--font-stack); background-color: var(--bg-base); color: var(--text-main); }
    body { line-height: 1.6; overflow-x: hidden; background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%); }
    a { color: inherit; text-decoration: none; transition: all 0.25s ease; }
    .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; width: 100%; }
    
    /* 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-color); box-shadow: var(--shadow-sm); }
    .header-inner { display: flex; align-items: center; justify-content: space-between; height: 74px; }
    .brand-wrap { display: flex; align-items: center; gap: 14px; }
    .brand-wrap img.ai-page-logo { height: 42px; width: auto; object-fit: contain; }
    .brand-title { font-size: 1.25rem; font-weight: 800; color: var(--text-main); letter-spacing: -0.5px; }
    .brand-title span { background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
    .nav-links { display: flex; align-items: center; gap: 0; }
    .nav-links a { padding: 8px 12px; font-size: 0.95rem; font-weight: 500; color: var(--text-sub); border-radius: var(--radius-sm); }
    .nav-links a:hover { color: var(--neon-purple); background: rgba(139, 92, 246, 0.06); }
    .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: 99px; transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); cursor: pointer; border: 1px solid transparent; }
    .btn-neon-primary { background: linear-gradient(135deg, #06b6d4 0%, #3b82f6 50%, #8b5cf6 100%); color: #ffffff; box-shadow: 0 4px 14px rgba(6, 182, 212, 0.35); }
    .btn-neon-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(139, 92, 246, 0.45); color: #ffffff; }
    .btn-neon-outline { background: #ffffff; color: var(--neon-purple); border-color: #d8b4fe; box-shadow: var(--shadow-sm); }
    .btn-neon-outline:hover { background: #faf5ff; border-color: var(--neon-purple); transform: translateY(-2px); }
    .mobile-menu-btn { display: none; background: none; border: none; font-size: 1.6rem; color: var(--text-main); cursor: pointer; }

    /* 通用Section布局 */
    section { padding: 80px 0; position: relative; }
    .section-header { text-align: center; max-width: 800px; margin: 0 auto 50px; }
    .section-badge { display: inline-block; padding: 6px 16px; font-size: 0.85rem; font-weight: 700; border-radius: 99px; text-transform: uppercase; margin-bottom: 14px; background: rgba(6, 182, 212, 0.1); color: var(--neon-cyan); border: 1px solid rgba(6, 182, 212, 0.3); }
    .section-title { font-size: 2.2rem; font-weight: 800; color: var(--text-main); margin-bottom: 16px; line-height: 1.3; }
    .section-desc { font-size: 1.05rem; color: var(--text-sub); }

    /* 首屏 Hero (无图片，纯CSS与霓虹渐变) */
    .hero-section { padding: 90px 0 70px; background: radial-gradient(circle at 50% 20%, rgba(6, 182, 212, 0.08) 0%, rgba(139, 92, 246, 0.05) 50%, rgba(248, 250, 252, 0) 100%); text-align: center; border-bottom: 1px solid var(--border-color); }
    .hero-content { max-width: 920px; margin: 0 auto; }
    .hero-tag { display: inline-flex; align-items: center; gap: 8px; background: #ffffff; border: 1px solid rgba(139, 92, 246, 0.3); padding: 8px 18px; border-radius: 99px; box-shadow: var(--shadow-sm); margin-bottom: 24px; font-size: 0.9rem; font-weight: 600; color: var(--neon-purple); }
    .hero-tag .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--neon-emerald); box-shadow: 0 0 8px var(--neon-emerald); }
    h1.hero-h1 { font-size: 2.8rem; font-weight: 900; line-height: 1.25; color: var(--text-main); margin-bottom: 22px; }
    h1.hero-h1 .glow-text { background: linear-gradient(135deg, #0284c7 0%, #6366f1 50%, #ec4899 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
    .hero-lead { font-size: 1.2rem; color: var(--text-sub); margin-bottom: 36px; line-height: 1.7; }
    .hero-actions { display: flex; justify-content: center; gap: 18px; flex-wrap: wrap; margin-bottom: 50px; }
    .hero-cta-btn { padding: 14px 36px; font-size: 1.1rem; border-radius: 99px; }
    .hero-metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 20px; }
    .metric-card { background: #ffffff; padding: 22px 16px; border-radius: var(--radius-md); border: 1px solid var(--border-color); box-shadow: var(--shadow-sm); border-top: 3px solid var(--neon-cyan); transition: transform 0.3s; }
    .metric-card:nth-child(2) { border-top-color: var(--neon-purple); }
    .metric-card:nth-child(3) { border-top-color: var(--neon-pink); }
    .metric-card:nth-child(4) { border-top-color: var(--neon-emerald); }
    .metric-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
    .metric-num { font-size: 1.9rem; font-weight: 800; color: var(--text-main); }
    .metric-label { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

    /* 模型矩阵徽章墙 */
    .model-matrix-bar { margin-top: 40px; padding: 20px; background: rgba(255, 255, 255, 0.8); border: 1px dashed var(--border-color); border-radius: var(--radius-md); }
    .model-tags-wrap { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 12px; }
    .model-tag-pill { background: #f8fafc; border: 1px solid #e2e8f0; font-size: 0.8rem; font-weight: 600; color: var(--text-sub); padding: 5px 12px; border-radius: 6px; }

    /* 卡片网格通用 */
    .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; }
    .neon-card { background: var(--bg-card); border-radius: var(--radius-md); border: 1px solid var(--border-color); padding: 28px 24px; box-shadow: var(--shadow-sm); transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); display: flex; flex-direction: column; }
    .neon-card:hover { border-color: rgba(6, 182, 212, 0.4); transform: translateY(-5px); box-shadow: var(--shadow-hover); }
    .card-icon { width: 48px; height: 48px; border-radius: 12px; display: flex; align-items: center; justify-content: center; margin-bottom: 18px; font-size: 1.4rem; font-weight: bold; background: linear-gradient(135deg, rgba(6,182,212,0.15), rgba(139,92,246,0.15)); color: var(--neon-purple); }
    .card-title { font-size: 1.25rem; font-weight: 700; color: var(--text-main); margin-bottom: 12px; }
    .card-desc { font-size: 0.95rem; color: var(--text-sub); line-height: 1.6; flex-grow: 1; }

    /* 流程与步骤 */
    .workflow-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; position: relative; }
    .step-box { background: #ffffff; border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 24px 20px; position: relative; text-align: left; }
    .step-number { font-size: 1.8rem; font-weight: 900; background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin-bottom: 8px; }
    
    /* 对比评测表格 */
    .compare-container { background: #ffffff; border-radius: var(--radius-lg); border: 1px solid var(--border-color); box-shadow: var(--shadow-md); overflow: hidden; }
    .compare-header-box { padding: 30px; background: linear-gradient(135deg, rgba(6, 182, 212, 0.08), rgba(139, 92, 246, 0.08)); border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 20px; }
    .score-badge { display: flex; align-items: center; gap: 14px; background: #ffffff; padding: 12px 24px; border-radius: 99px; border: 1px solid rgba(139, 92, 246, 0.3); box-shadow: var(--shadow-sm); }
    .score-num { font-size: 1.8rem; font-weight: 900; color: var(--neon-purple); }
    .table-responsive { width: 100%; overflow-x: auto; }
    .compare-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 0.95rem; }
    .compare-table th, .compare-table td { padding: 18px 24px; border-bottom: 1px solid var(--border-color); }
    .compare-table th { background: #f8fafc; font-weight: 700; color: var(--text-main); }
    .compare-table td.highlight { background: rgba(6, 182, 212, 0.03); font-weight: 600; color: var(--neon-purple); }

    /* 案例展示 */
    .case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .case-card { background: #ffffff; border-radius: var(--radius-md); border: 1px solid var(--border-color); overflow: hidden; box-shadow: var(--shadow-sm); transition: transform 0.3s; }
    .case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
    .case-media-box { width: 100%; aspect-ratio: 16/9; background: #f1f5f9; overflow: hidden; }
    .case-media-box img { width: 100%; height: 100%; object-fit: cover; display: block; }
    .case-media-box.square { aspect-ratio: 1/1; }
    .case-body { padding: 20px; }
    .case-tag { font-size: 0.75rem; font-weight: 700; color: var(--neon-cyan); background: rgba(6, 182, 212, 0.1); padding: 4px 10px; border-radius: 4px; display: inline-block; margin-bottom: 10px; }
    .case-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; }

    /* 资讯展示与短代码区域 */
    .articles-section { background: #ffffff; }
    .article-links-wrap { margin-top: 24px; display: flex; flex-wrap: wrap; gap: 12px; }
    .article-pill { display: inline-flex; align-items: center; padding: 8px 16px; background: var(--bg-base); border: 1px solid var(--border-color); border-radius: 6px; font-size: 0.9rem; color: var(--text-sub); }
    .article-pill:hover { border-color: var(--neon-purple); color: var(--neon-purple); }

    /* FAQ 折叠面板 */
    .faq-list { max-width: 900px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
    .faq-item { background: #ffffff; border: 1px solid var(--border-color); border-radius: var(--radius-md); overflow: hidden; transition: border-color 0.2s; }
    .faq-item:hover { border-color: rgba(139, 92, 246, 0.3); }
    .faq-question { padding: 20px 24px; font-size: 1.05rem; font-weight: 700; color: var(--text-main); cursor: pointer; display: flex; justify-content: space-between; align-items: center; user-select: none; }
    .faq-icon { font-size: 1.2rem; transition: transform 0.3s; color: var(--neon-purple); }
    .faq-answer { display: none; padding: 0 24px 20px; font-size: 0.95rem; color: var(--text-sub); line-height: 1.7; border-top: 1px solid #f8fafc; }
    .faq-item.active .faq-answer { display: block; }
    .faq-item.active .faq-icon { transform: rotate(45deg); }

    /* 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: 26px; box-shadow: var(--shadow-sm); display: flex; flex-direction: column; }
    .review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
    .review-avatar { width: 44px; height: 44px; border-radius: 50%; background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple)); color: #ffffff; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1rem; }
    .review-user { font-size: 1rem; font-weight: 700; color: var(--text-main); }
    .review-role { font-size: 0.8rem; color: var(--text-muted); }
    .review-text { font-size: 0.92rem; color: var(--text-sub); line-height: 1.65; flex-grow: 1; }
    .review-rating { color: #f59e0b; margin-top: 12px; font-size: 0.9rem; }

    /* 表单区域 */
    .form-container { background: #ffffff; border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: 40px; box-shadow: var(--shadow-md); max-width: 800px; margin: 0 auto; }
    .form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
    .form-group { display: flex; flex-direction: column; gap: 8px; }
    .form-group.full { grid-column: span 2; }
    .form-label { font-size: 0.9rem; font-weight: 600; color: var(--text-main); }
    .form-control { width: 100%; padding: 12px 16px; font-size: 0.95rem; border: 1px solid var(--border-color); border-radius: var(--radius-sm); outline: none; transition: border-color 0.2s, box-shadow 0.2s; font-family: inherit; }
    .form-control:focus { border-color: var(--neon-purple); box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15); }
    textarea.form-control { resize: vertical; min-height: 110px; }

    /* 招商加盟卡片 */
    .agent-box { background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%); color: #ffffff; border-radius: var(--radius-lg); padding: 50px 40px; text-align: center; margin-bottom: 60px; box-shadow: 0 10px 30px rgba(15, 23, 42, 0.2); }
    .agent-title { font-size: 2rem; font-weight: 800; margin-bottom: 16px; }
    .agent-desc { font-size: 1.05rem; color: #cbd5e1; max-width: 700px; margin: 0 auto 30px; }
    .agent-perks { display: flex; justify-content: center; gap: 30px; flex-wrap: wrap; margin-bottom: 36px; }
    .perk-item { background: rgba(255, 255, 255, 0.1); padding: 14px 24px; border-radius: var(--radius-sm); border: 1px solid rgba(255, 255, 255, 0.15); font-weight: 600; }

    /* 客服二维码展示 */
    .contact-card-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 30px; align-items: center; }
    .qr-showcase { text-align: center; background: #ffffff; padding: 24px; border-radius: var(--radius-md); border: 1px solid var(--border-color); }
    .qr-img-wrap { width: 170px; height: 170px; margin: 0 auto 14px; padding: 6px; border: 1px solid var(--border-color); border-radius: 12px; background: #ffffff; }
    .qr-img-wrap img { width: 100%; height: 100%; object-fit: contain; display: block; }

    /* 页脚与友情链接 */
    .site-footer { background: #0f172a; color: #94a3b8; padding: 60px 0 30px; border-top: 1px solid #1e293b; font-size: 0.9rem; }
    .footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; margin-bottom: 40px; }
    .footer-brand h4 { font-size: 1.3rem; color: #ffffff; margin-bottom: 14px; font-weight: 800; }
    .footer-col h5 { color: #ffffff; font-size: 1rem; font-weight: 700; margin-bottom: 16px; }
    .footer-links { list-style: none; display: flex; flex-direction: column; gap: 10px; }
    .footer-links a { color: #94a3b8; }
    .footer-links a:hover { color: var(--neon-cyan); }
    .footer-bottom { border-top: 1px solid #1e293b; padding-top: 24px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
    .friend-links-box { margin-bottom: 30px; padding: 18px 20px; background: rgba(255, 255, 255, 0.03); border-radius: var(--radius-sm); border: 1px solid #1e293b; }
    .friend-links-title { font-weight: 700; color: #cbd5e1; margin-bottom: 10px; font-size: 0.85rem; }
    .friend-links-list { display: flex; flex-wrap: wrap; gap: 16px; }
    .friend-links-list a { color: #94a3b8; font-size: 0.85rem; }
    .friend-links-list a:hover { color: var(--neon-cyan); }

    /* 浮动组件与返回顶部 */
    .floating-tools { position: fixed; right: 20px; bottom: 30px; z-index: 99; display: flex; flex-direction: column; gap: 10px; }
    .float-btn { width: 46px; height: 46px; border-radius: 50%; background: #ffffff; color: var(--text-main); border: 1px solid var(--border-color); display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-md); cursor: pointer; transition: all 0.2s; font-size: 1.1rem; }
    .float-btn:hover { background: var(--neon-purple); color: #ffffff; border-color: var(--neon-purple); }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .grid-3, .grid-4, .case-grid, .reviews-grid, .hero-metrics, .workflow-steps { grid-template-columns: repeat(2, 1fr); }
      .footer-top { grid-template-columns: 1fr 1fr; }
      .contact-card-grid { grid-template-columns: 1fr; }
      h1.hero-h1 { font-size: 2.2rem; }
    }
    @media (max-width: 640px) {
      .grid-3, .grid-4, .grid-2, .case-grid, .reviews-grid, .hero-metrics, .workflow-steps { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .form-group.full { grid-column: span 1; }
      .footer-top { grid-template-columns: 1fr; }
      h1.hero-h1 { font-size: 1.8rem; }
      .section-title { font-size: 1.6rem; }
      .compare-header-box { flex-direction: column; text-align: center; }
    }