:root{--bg:#f6f8fc;--card:#ffffff;--card2:#eef4ff;--text:#132238;--muted:#5c6b82;--line:#dbe4f3;--brand:#1463ff;--brand2:#00c2ff;--brand3:#7c4dff;--ok:#1ca97a;--warn:#ffb020;--shadow:0 18px 50px rgba(17,45,103,.10);--radius:20px;--max:1200px}
    *{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,#f6f8fc 35%,#f9fbff 100%);color:var(--text)}
    a{color:var(--brand);text-decoration:none} img{display:block;max-width:100%}
    .container{width:min(var(--max),calc(100% - 32px));margin:0 auto}
    .topbar,.nav,.section,.footer{width:100%}
    .topbar{background:linear-gradient(90deg,#0f2d57,#1247b5 45%,#0f7fe0);color:#fff}
    .topbar .container{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 0;font-size:14px}
    .nav{position:sticky;top:0;z-index:50;background:rgba(246,248,252,.86);backdrop-filter:blur(14px);border-bottom:1px solid rgba(219,228,243,.75)}
    .nav-inner{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 img{width:42px;height:42px;object-fit:contain}.brand strong{display:block;font-size:18px}.brand span{display:block;font-size:12px;color:var(--muted)}
    .menu{display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:flex-end}.menu a{padding:9px 12px;border-radius:999px;color:var(--text);font-size:14px}.menu a:hover,.menu a.active{background:#e8f0ff;color:#0d3ea8}
    .nav-actions{display:flex;align-items:center;gap:10px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:999px;padding:12px 18px;font-weight:700;cursor:pointer;transition:.25s transform,.25s box-shadow,.25s background,.25s color;white-space:nowrap}
    .btn:hover{transform:translateY(-2px)} .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 12px 28px rgba(20,99,255,.24)} .btn-ghost{background:#fff;color:#17335a;border:1px solid var(--line)}
    .hamburger{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px}
    .hero{padding:42px 0 26px}.hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:22px;align-items:stretch}
    .hero-card{background:linear-gradient(135deg,#102b57 0,#133b82 45%,#1d7cff 100%);color:#fff;border-radius:28px;padding:34px;box-shadow:var(--shadow);position:relative;overflow:hidden}
    .hero-card:before,.hero-card:after{content:"";position:absolute;border-radius:50%;background:rgba(255,255,255,.12);filter:blur(2px)}
    .hero-card:before{width:260px;height:260px;right:-80px;top:-80px}.hero-card:after{width:180px;height:180px;right:120px;bottom:-70px}
    h1{margin:12px 0 14px;font-size:clamp(30px,5vw,54px);line-height:1.05}.hero p{margin:0;color:#e7f1ff;line-height:1.75}
    .hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0}.tag{padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.14);font-size:13px}
    .hero-ctas{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.hero-meta{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px}
    .meta{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.14);border-radius:18px;padding:16px}.meta strong{display:block;font-size:20px}.meta span{font-size:13px;color:#dceaff}
    .side-stack{display:grid;gap:16px}.side-card{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:20px;box-shadow:var(--shadow)}
    .side-card h3,.section h2{margin:0 0 12px;font-size:24px}.section{padding:24px 0}.section-head{display:flex;align-items:end;justify-content:space-between;gap:12px;margin-bottom:18px}.section-head p{margin:0;color:var(--muted)}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .card{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:20px;box-shadow:0 10px 30px rgba(19,34,56,.05);transition:.25s transform,.25s box-shadow}.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
    .card h3{margin:0 0 10px;font-size:18px}.card p{margin:0;color:var(--muted);line-height:1.7}
    .stat{background:linear-gradient(180deg,#fff,#f5f9ff);border:1px solid #dfe8f7}.stat strong{display:block;font-size:28px;margin-bottom:6px;color:#0f2d57}.stat span{color:var(--muted)}
    .steps{counter-reset:step}.step:before{counter-increment:step;content:"0" counter(step);display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,#eaf2ff,#dff7ff);color:#0d3ea8;font-weight:800;margin-bottom:14px}
    .table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:22px;background:#fff;box-shadow:var(--shadow)} table{width:100%;border-collapse:collapse;min-width:760px} th,td{padding:16px 14px;border-bottom:1px solid #edf2f8;text-align:left;vertical-align:top} th{background:#f4f8ff;color:#17335a}
    .compare{display:grid;grid-template-columns:1fr .8fr;gap:16px;align-items:start}.rating{background:linear-gradient(135deg,#0f2d57,#1463ff);color:#fff}
    .rating .score{font-size:44px;font-weight:900;line-height:1;margin:10px 0}.rating small{color:#d8ebff}
    details{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px 18px;box-shadow:0 10px 24px rgba(19,34,56,.04)} summary{cursor:pointer;font-weight:700;list-style:none} summary::-webkit-details-marker{display:none}
    .reviews .card{background:linear-gradient(180deg,#fff,#f8fbff)} .quote{font-size:15px;line-height:1.8;color:var(--text)} .who{margin-top:14px;color:var(--muted);font-size:13px}
    .articles a{display:block;padding:14px 0;border-bottom:1px solid #edf2f8;color:var(--text)} .articles a:last-child{border-bottom:0}
    .form{display:grid;gap:14px}.field{display:grid;gap:8px} .field label{font-size:14px;font-weight:700} .field input,.field select,.field textarea{width:100%;padding:13px 14px;border:1px solid #cfdaf0;border-radius:14px;background:#fff;color:var(--text);font:inherit;outline:none} .field textarea{min-height:120px;resize:vertical}
    .footer{margin-top:26px;background:#0f1f39;color:#dbe7ff;padding:28px 0 20px}.footer a{color:#fff}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr .8fr;gap:18px}.footer .card{background:rgba(255,255,255,.05);border-color:rgba(255,255,255,.09);box-shadow:none;color:#dbe7ff}.footer .card p,.footer .card li{color:#c6d6ef}
    .links{display:flex;flex-wrap:wrap;gap:10px}.links a,.chip{padding:9px 12px;border-radius:999px;background:#eaf2ff;color:#10305d;border:1px solid #d5e3fb;font-size:13px}
    .floating{position:fixed;right:16px;bottom:18px;z-index:60;display:grid;gap:10px}.floating a,.floating button{border:0;border-radius:999px;padding:12px 14px;background:#fff;box-shadow:var(--shadow);color:var(--text);font-weight:700}
    .toc{display:flex;flex-wrap:wrap;gap:10px}
    .fade{opacity:0;transform:translateY(18px);transition:.6s ease}.fade.show{opacity:1;transform:none}
    .mobile-only{display:none}
    @media (max-width: 980px){.hero-grid,.compare,.footer-grid,.grid-4,.grid-3,.grid-2{grid-template-columns:1fr}.menu{display:none}.hamburger{display:inline-flex}.nav.open .menu{display:flex;flex-direction:column;align-items:stretch;width:100%;padding:12px 0}.nav-inner{flex-wrap:wrap}.nav-actions{margin-left:auto}.hero-card{padding:24px}.hero-meta{grid-template-columns:1fr}}
    @media (max-width: 640px){.container{width:min(var(--max),calc(100% - 22px))}.topbar .container{font-size:12px}.brand strong{font-size:16px}.hero{padding-top:24px}.hero-ctas,.section-head,.nav-inner{align-items:flex-start}.btn{width:100%}.nav-actions{width:100%}.nav-actions .btn,.nav-actions .hamburger{flex:1}.mobile-stack{display:grid;gap:16px}.desktop-only{display:none}.mobile-only{display:block}}