:root{--bg:#f7f9fc;--card:#ffffff;--card2:#f3f7ff;--text:#142033;--muted:#5d6b83;--line:#dbe4f3;--brand:#2563eb;--brand2:#14b8a6;--warm:#ffb703;--shadow:0 14px 40px rgba(20,32,51,.08);--radius:20px}
    *{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:radial-gradient(circle at top left,#eef5ff 0,#f7f9fc 36%,#f6fbff 100%);color:var(--text)}
    a{color:inherit;text-decoration:none}img{display:block;max-width:100%}button,input,select,textarea{font:inherit}
    .container{width:min(1180px,calc(100% - 32px));margin:0 auto}
    header{position:sticky;top:0;z-index:30;background:rgba(247,249,252,.88);backdrop-filter:blur(14px);border-bottom:1px solid rgba(219,228,243,.8)}
    .nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}
    .brand{display:flex;align-items:center;gap:12px;min-width:0}
    .brand .ai-page-logo{width:42px;height:42px;object-fit:contain;border-radius:12px;background:#fff;padding:4px;box-shadow:var(--shadow)}
    .brand strong{display:block;font-size:18px;line-height:1.1}
    .brand span{display:block;font-size:12px;color:var(--muted);margin-top:3px}
    .nav-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:#31415b;padding:8px 10px;border-radius:999px;transition:.2s}
    .nav-links a:hover{background:#eaf1ff;color:var(--brand)}
    .nav-cta{display:flex;gap:10px;align-items:center}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:999px;padding:12px 18px;font-weight:700;cursor:pointer;transition:.22s ease;box-shadow:none}
    .btn-primary{background:linear-gradient(135deg,var(--brand),#4f8cff);color:#fff;box-shadow:0 12px 26px rgba(37,99,235,.24)}
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 30px rgba(37,99,235,.3)}
    .btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
    .btn-ghost:hover{border-color:#bcd0f6;transform:translateY(-1px)}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 12px}
    main{overflow:hidden}
    .section{padding:34px 0}
    .hero{padding:36px 0 18px}
    .hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:22px;align-items:stretch}
    .hero-panel,.glass-card,.info-card,.feature-card,.quote-card,.faq-item,.article-card,.case-card,.match-card,.compare-card,.form-card,.footer-card{background:linear-gradient(180deg,rgba(255,255,255,.98),rgba(250,252,255,.96));border:1px solid rgba(219,228,243,.95);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-panel{padding:30px;position:relative;overflow:hidden}
    .hero-panel:before{content:"";position:absolute;inset:auto -10% -35% auto;width:280px;height:280px;background:radial-gradient(circle,rgba(37,99,235,.16),transparent 65%);pointer-events:none}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:#e8f2ff;color:#1657d1;border:1px solid #cfe0ff;border-radius:999px;padding:8px 12px;font-size:13px;font-weight:700}
    h1{margin:16px 0 12px;font-size:clamp(30px,4vw,52px);line-height:1.1;letter-spacing:-.03em}
    .lead{font-size:16px;line-height:1.8;color:var(--muted);max-width:56ch;margin:0}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0 18px}
    .hero-points{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:16px}
    .mini{padding:14px;background:#f7fbff;border:1px solid #e4edf9;border-radius:16px}
    .mini b{display:block;font-size:18px;margin-bottom:6px;color:#14304e}.mini span{color:var(--muted);font-size:13px;line-height:1.55}
    .side-stack{display:grid;gap:14px}
    .hero-stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .stat{padding:18px 16px;min-height:110px}
    .stat .num{font-size:30px;font-weight:800;color:#123d9b}.stat p{margin:8px 0 0;color:var(--muted);font-size:13px;line-height:1.55}
    .badge-row{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:9px 12px;background:#f0f6ff;border:1px solid #d8e6ff;border-radius:999px;color:#29456f;font-size:13px}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
    .section h2{margin:0 0 10px;font-size:28px}.section .sub{margin:0 0 18px;color:var(--muted);line-height:1.8}
    .feature-card,.quote-card,.article-card,.case-card,.match-card,.compare-card,.form-card,.footer-card,.glass-card{padding:22px}
    .feature-card h3,.case-card h3,.article-card h3,.match-card h3,.compare-card h3,.form-card h3{margin:0 0 10px;font-size:18px}
    .feature-card p,.case-card p,.article-card p,.match-card p,.compare-card p,.form-card p,.quote-card p{margin:0;color:var(--muted);line-height:1.75}
    .icon-dot{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,#e7f0ff,#dffcf8);display:grid;place-items:center;color:var(--brand);font-weight:800;margin-bottom:14px}
    .flow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .step{padding:20px;border-radius:18px;background:#fff;border:1px solid var(--line)}
    .step b{display:inline-flex;width:30px;height:30px;border-radius:10px;align-items:center;justify-content:center;background:#e9f1ff;color:#1557d6;margin-bottom:12px}
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:840px}
    th,td{padding:16px 14px;border-bottom:1px solid #edf2fb;text-align:left;vertical-align:top}
    th{background:#f6f9ff;color:#19304d;font-size:14px}
    td{color:#33445f;font-size:14px;line-height:1.65}
    .rating{font-weight:800;color:#0f5bd6}
    .faq{display:grid;gap:12px}
    .faq-item{padding:0;overflow:hidden}
    .faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;border:0;background:transparent;padding:18px 20px;color:var(--text);font-weight:700;text-align:left;cursor:pointer}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .26s ease;padding:0 20px;color:var(--muted);line-height:1.8}
    .faq-item.open .faq-a{padding-bottom:18px;max-height:220px}
    .reviews,.articles,.cases,.compare-grid,.network,.footer-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .review-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}
    .avatar{width:42px;height:42px;border-radius:50%;background:linear-gradient(135deg,#dff2ff,#e9fff8);display:grid;place-items:center;font-weight:800;color:#1a4fa3}
    .form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    label{display:block;font-size:13px;color:#304560;margin-bottom:8px;font-weight:700}
    input,select,textarea{width:100%;border:1px solid var(--line);border-radius:14px;background:#fff;padding:13px 14px;color:var(--text);outline:none;transition:.2s}
    input:focus,select:focus,textarea:focus{border-color:#8db5ff;box-shadow:0 0 0 4px rgba(37,99,235,.08)}
    textarea{min-height:120px;resize:vertical}
    .span-2{grid-column:span 2}
    .footer{padding:24px 0 30px}
    .footer-grid{grid-template-columns:1.15fr .85fr .9fr}
    .footer small,.footer p,.footer a{color:var(--muted)}
    .floating{position:fixed;right:16px;bottom:18px;z-index:40;display:grid;gap:10px}
    .float-btn{width:52px;height:52px;border-radius:16px;background:linear-gradient(135deg,var(--brand),#43c4ff);color:#fff;display:grid;place-items:center;box-shadow:0 16px 32px rgba(37,99,235,.28)}
    .float-btn.secondary{background:linear-gradient(135deg,var(--brand2),#25d0b5)}
    .backtop{position:fixed;left:16px;bottom:18px;z-index:40;width:46px;height:46px;border-radius:14px;border:1px solid var(--line);background:#fff;color:var(--text);display:grid;place-items:center;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:.2s}
    .backtop.show{opacity:1;pointer-events:auto}
    .fade-up{opacity:0;transform:translateY(18px);transition:.6s ease}
    .fade-up.in{opacity:1;transform:none}
    .anchor{scroll-margin-top:92px}
    .note{padding:14px 16px;border-radius:16px;background:#f6fbff;border:1px dashed #cfe0ff;color:#35526f;line-height:1.7}
    @media (max-width: 960px){
      .hero-grid,.grid-3,.grid-2,.reviews,.articles,.cases,.compare-grid,.network,.footer-grid,.flow{grid-template-columns:1fr}
      .hero-points,.hero-stats,.form-grid{grid-template-columns:1fr}
      .span-2{grid-column:auto}
      .nav-links,.nav-cta{display:none}
      .menu-btn{display:inline-flex}
      .nav.open .nav-links,.nav.open .nav-cta{display:flex}
      .nav.open{align-items:flex-start;flex-wrap:wrap}
      .nav.open .nav-links{width:100%;order:3;justify-content:flex-start;padding-top:8px}
      .nav.open .nav-cta{width:100%;order:4}
    }