:root{--bg:#f7f5f1;--panel:#ffffff;--text:#1f2937;--muted:#5b6472;--line:#e7e1d8;--brand:#4f46e5;--brand2:#0ea5e9;--accent:#8b5cf6;--shadow:0 18px 50px rgba(31,41,55,.08)}
    *{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;font-family:Inter,system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;background:radial-gradient(circle at top left,rgba(79,70,229,.10),transparent 28%),radial-gradient(circle at top right,rgba(14,165,233,.10),transparent 26%),linear-gradient(180deg,#fff 0%,var(--bg) 100%);color:var(--text)}
    a{color:inherit;text-decoration:none} img{display:block;max-width:100%} .container{width:min(1180px,calc(100% - 32px));margin:0 auto}
    .site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.78);backdrop-filter:blur(16px);border-bottom:1px solid rgba(231,225,216,.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:44px;height:44px;object-fit:contain;border-radius:12px;background:#fff;border:1px solid var(--line);padding:4px;box-shadow:0 8px 20px rgba(0,0,0,.05)} .brand strong{display:block;font-size:1rem;line-height:1.2}.brand span{display:block;color:var(--muted);font-size:.86rem}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 12px;color:var(--text)}
    .nav-links{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:10px 16px;align-items:center}.nav-links a{font-size:.92rem;color:#374151;padding:8px 10px;border-radius:10px}.nav-links a:hover{background:#f3f4f6}
    .hero{padding:32px 0 22px}.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:stretch}.hero-card{background:linear-gradient(135deg,rgba(79,70,229,.10),rgba(14,165,233,.10) 48%,rgba(139,92,246,.12));border:1px solid rgba(79,70,229,.14);border-radius:28px;box-shadow:var(--shadow);padding:30px;position:relative;overflow:hidden}.hero-card:before,.hero-card:after{content:"";position:absolute;border-radius:999px;filter:blur(4px);opacity:.7}.hero-card:before{width:180px;height:180px;right:-40px;top:-50px;background:radial-gradient(circle,rgba(255,255,255,.92),rgba(79,70,229,.15) 70%,transparent 72%)}.hero-card:after{width:220px;height:220px;left:-90px;bottom:-110px;background:radial-gradient(circle,rgba(14,165,233,.22),transparent 72%)}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:.84rem;font-weight:700;color:#4338ca;background:rgba(255,255,255,.8);border:1px solid rgba(79,70,229,.12);border-radius:999px;padding:8px 12px}
    h1{font-size:clamp(2rem,4vw,3.6rem);line-height:1.06;margin:16px 0 14px;letter-spacing:-.03em}
    .lead{font-size:1.05rem;line-height:1.8;color:var(--muted);max-width:58ch;margin:0 0 20px}
    .cta-row{display:flex;flex-wrap:wrap;gap:12px;margin:22px 0 0}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 18px;border-radius:14px;font-weight:700;border:1px solid transparent;transition:transform .2s ease,box-shadow .2s ease,background .2s ease}.btn:hover{transform:translateY(-2px);box-shadow:0 12px 24px rgba(79,70,229,.16)} .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff}.btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
    .hero-side{display:grid;gap:14px}.hero-metrics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.metric,.info-card,.review-card,.feature-card,.case-card,.faq-item,.timeline-item,.price-card,.article-card,.service-card,.compare-card,.network-card{background:var(--panel);border:1px solid var(--line);border-radius:22px;box-shadow:0 10px 30px rgba(17,24,39,.05)}.metric{padding:18px;transition:transform .2s ease}.metric:hover,.feature-card:hover,.service-card:hover,.case-card:hover,.article-card:hover,.compare-card:hover,.review-card:hover,.price-card:hover{transform:translateY(-3px)} .metric b{display:block;font-size:1.55rem;margin-bottom:6px}.metric span{color:var(--muted);font-size:.92rem}
    .hero-promo{padding:18px}.hero-promo h3{margin:0 0 10px;font-size:1.05rem}.hero-promo p{margin:0;color:var(--muted);line-height:1.75}.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}.tag-cloud span,.chip{display:inline-flex;align-items:center;padding:8px 11px;border-radius:999px;background:#f8fafc;border:1px solid #e5e7eb;color:#374151;font-size:.86rem}
    section{padding:18px 0}.section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:16px}.section-head h2{margin:0;font-size:1.6rem}.section-head p{margin:0;color:var(--muted);max-width:62ch;line-height:1.7}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.feature-card,.service-card,.case-card,.article-card,.review-card,.compare-card,.network-card,.info-card,.price-card{padding:20px}.feature-card h3,.service-card h3,.case-card h3,.article-card h3,.review-card h3,.compare-card h3,.network-card h3,.info-card h3,.price-card h3{margin:0 0 10px;font-size:1.02rem}.feature-card p,.service-card p,.case-card p,.article-card p,.review-card p,.compare-card p,.network-card p,.info-card p,.price-card p{margin:0;color:var(--muted);line-height:1.75}
    .steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.step{padding:20px;border-radius:22px;background:linear-gradient(180deg,#fff,#fbfbfd);border:1px solid var(--line);position:relative}.step b{display:inline-flex;width:34px;height:34px;border-radius:12px;align-items:center;justify-content:center;background:linear-gradient(135deg,rgba(79,70,229,.12),rgba(14,165,233,.12));color:#3730a3;margin-bottom:10px}
    .comparison-table{width:100%;border-collapse:separate;border-spacing:0 10px}.comparison-wrap{overflow:auto}.comparison-table th,.comparison-table td{text-align:left;padding:14px 16px;background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.comparison-table th:first-child,.comparison-table td:first-child{border-left:1px solid var(--line);border-radius:16px 0 0 16px}.comparison-table th:last-child,.comparison-table td:last-child{border-right:1px solid var(--line);border-radius:0 16px 16px 0}.comparison-table thead th{background:#f8fafc;color:#111827}.rating{font-weight:800;color:#4f46e5}
    .faq-list{display:grid;gap:12px}.faq-item button{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 20px;border:0;background:transparent;color:var(--text);font-size:1rem;font-weight:700;text-align:left;cursor:pointer}.faq-answer{max-height:0;overflow:hidden;transition:max-height .28s ease;padding:0 20px}.faq-answer p{margin:0 0 18px;color:var(--muted);line-height:1.8}.faq-item.active .faq-answer{max-height:180px}
    .form{display:grid;gap:12px}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.form input,.form select,.form textarea{width:100%;padding:13px 14px;border-radius:14px;border:1px solid #d9dfe8;background:#fff;color:var(--text);font:inherit;outline:none}.form textarea{min-height:120px;resize:vertical}.form input:focus,.form select:focus,.form textarea:focus{border-color:#8b5cf6;box-shadow:0 0 0 4px rgba(139,92,246,.12)}
    .footer{margin-top:10px;padding:24px 0 30px;background:#111827;color:#e5e7eb}.footer a{color:#fff}.footer .muted{color:#c7ced9}.footer-grid{display:grid;grid-template-columns:1.1fr .9fr .9fr;gap:16px;align-items:start}.footer .box{padding:18px;border-radius:20px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08)} .footer small{display:block;margin-top:14px;color:#aeb7c6;line-height:1.7}
    .floating{position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px}.floating a,.floating button{width:48px;height:48px;border-radius:16px;border:1px solid var(--line);background:#fff;display:grid;place-items:center;box-shadow:var(--shadow);cursor:pointer;color:#111827}
    .backtop{opacity:0;pointer-events:none;transform:translateY(8px);transition:.2s}.backtop.show{opacity:1;pointer-events:auto;transform:none}
    .fade-in{opacity:0;transform:translateY(16px);transition:opacity .65s ease,transform .65s ease}.fade-in.show{opacity:1;transform:none}
    .list{margin:0;padding-left:18px;color:var(--muted);line-height:1.8}.inline-links{display:flex;flex-wrap:wrap;gap:10px}.table-note{color:var(--muted);font-size:.92rem;margin-top:10px}
    .gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.gallery img,.square img{border-radius:20px;border:1px solid var(--line);box-shadow:var(--shadow)}
    .square{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.square .img-box{background:#fff;border:1px solid var(--line);border-radius:20px;padding:12px}
    @media (max-width: 960px){.hero-grid,.grid-3,.steps,.footer-grid,.grid-2,.gallery,.square{grid-template-columns:1fr}.hero-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}}
    @media (max-width: 720px){.nav-toggle{display:inline-flex}.nav-links{display:none;width:100%;padding:12px 0 0}.nav-links.open{display:flex}.nav{flex-wrap:wrap}.hero{padding-top:22px}.hero-card{padding:22px}.form-grid,.hero-metrics{grid-template-columns:1fr}.section-head{align-items:flex-start;flex-direction:column}.comparison-wrap{margin-right:-16px;padding-right:16px}.floating{right:12px;bottom:12px}}