:root{
      --bg:#f6f9fc;
      --panel:#ffffff;
      --panel-2:#f9fbff;
      --text:#16202d;
      --muted:#5d6b7c;
      --line:#dce5ef;
      --brand:#1f6feb;
      --brand-2:#14b8a6;
      --accent:#ffb347;
      --shadow:0 16px 40px rgba(21, 45, 76, .08);
      --radius:20px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family: -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at 15% 10%, rgba(31,111,235,.08), transparent 24%),
        radial-gradient(circle at 85% 12%, rgba(20,184,166,.08), transparent 22%),
        linear-gradient(180deg, #fdfefe 0%, #f6f9fc 40%, #f7fbff 100%);
      line-height:1.7;
    }
    a{color:var(--brand); text-decoration:none}
    img{display:block; max-width:100%; height:auto}
    .container{width:min(var(--container), calc(100% - 32px)); margin:0 auto}
    .topbar{
      position:sticky; top:0; z-index:40;
      background:rgba(247,251,255,.92);
      backdrop-filter: blur(14px);
      border-bottom:1px solid rgba(220,229,239,.9);
    }
    .nav{
      display:flex; align-items:center; justify-content:space-between; gap:16px;
      min-height:72px;
    }
    .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; box-shadow:0 6px 18px rgba(31,111,235,.12)}
    .brand h2{margin:0; font-size:1.04rem; line-height:1.2}
    .brand p{margin:2px 0 0; color:var(--muted); font-size:.84rem}
    .nav-links{display:flex; align-items:center; gap:10px; flex-wrap:wrap; justify-content:flex-end}
    .nav-links a{
      color:var(--text); font-size:.92rem; padding:10px 12px; border-radius:999px;
    }
    .nav-links a:hover,.nav-links a:focus{background:#eef5ff; color:var(--brand)}
    .nav-actions{display:flex; align-items:center; gap:10px}
    .btn{
      display:inline-flex; align-items:center; justify-content:center; gap:8px;
      border:1px solid transparent; border-radius:14px; padding:12px 16px;
      font-weight:700; cursor:pointer; transition:.22s ease;
      white-space:nowrap;
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),#4f8efc); color:#fff; box-shadow:0 10px 24px rgba(31,111,235,.18)}
    .btn-primary:hover{transform:translateY(-2px); box-shadow:0 14px 30px rgba(31,111,235,.22)}
    .btn-secondary{background:#fff; color:var(--text); border-color:var(--line)}
    .btn-secondary:hover{border-color:#bfd1ea; transform:translateY(-1px)}
    .menu-toggle{display:none; width:44px; height:44px; border:1px solid var(--line); background:#fff; border-radius:12px}
    .menu-toggle span{display:block; width:18px; height:2px; margin:4px auto; background:var(--text); border-radius:2px}
    header, main, footer{position:relative}
    .hero{
      padding:44px 0 26px;
    }
    .hero-grid{
      display:grid; grid-template-columns: 1.2fr .8fr; gap:22px; align-items:stretch;
    }
    .hero-card{
      background:
        linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.86)),
        radial-gradient(circle at top right, rgba(31,111,235,.10), transparent 28%),
        radial-gradient(circle at bottom left, rgba(20,184,166,.10), transparent 26%);
      border:1px solid rgba(220,229,239,.9);
      border-radius:28px;
      padding:34px;
      box-shadow:var(--shadow);
      overflow:hidden;
    }
    .eyebrow{
      display:inline-flex; align-items:center; gap:8px;
      background:#eef5ff; color:#1d4ed8; border:1px solid #dbeafe;
      padding:8px 12px; border-radius:999px; font-size:.86rem; font-weight:700;
    }
    h1{
      margin:16px 0 14px;
      font-size:clamp(2rem, 4vw, 3.7rem);
      line-height:1.08;
      letter-spacing:-.02em;
    }
    .lead{margin:0; color:var(--muted); font-size:1.02rem; max-width:58ch}
    .hero-actions{display:flex; flex-wrap:wrap; gap:12px; margin-top:24px}
    .hero-meta{
      display:flex; flex-wrap:wrap; gap:12px; margin-top:22px;
    }
    .chip{
      padding:10px 12px; border-radius:999px; background:#f4f8fd; border:1px solid var(--line);
      color:#314155; font-size:.9rem;
    }
    .hero-side{
      display:grid; gap:16px;
    }
    .mini-panel{
      background:linear-gradient(180deg,#fff,#f8fbff);
      border:1px solid var(--line);
      border-radius:24px;
      padding:22px;
      box-shadow:var(--shadow);
    }
    .mini-panel h3{margin:0 0 10px; font-size:1.08rem}
    .stat-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:12px}
    .stat{
      background:#fff;
      border:1px solid var(--line);
      border-radius:18px;
      padding:16px;
    }
    .stat strong{display:block; font-size:1.5rem; color:var(--brand)}
    .stat span{display:block; color:var(--muted); font-size:.88rem}
    .section{padding:14px 0 2px}
    .section-head{display:flex; align-items:end; justify-content:space-between; gap:16px; margin-bottom:18px}
    .section-head h2{margin:0; font-size:1.7rem}
    .section-head p{margin:0; color:var(--muted); max-width:64ch}
    .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(--panel);
      border:1px solid var(--line);
      border-radius:22px;
      padding:22px;
      box-shadow:0 8px 24px rgba(15,35,61,.05);
      transition:transform .22s ease, box-shadow .22s ease, border-color .22s ease;
    }
    .card:hover{transform:translateY(-3px); box-shadow:0 16px 32px rgba(15,35,61,.08); border-color:#c8d8ea}
    .card h3{margin:0 0 10px; font-size:1.08rem}
    .card p,.card li{color:var(--muted)}
    .list-clean{margin:0; padding-left:18px}
    .tag-cloud{display:flex; flex-wrap:wrap; gap:10px}
    .tag-cloud span{
      background:#f1f7ff; color:#214a87; border:1px solid #d9e7fb;
      padding:8px 12px; border-radius:999px; font-size:.9rem;
    }
    .timeline{display:grid; gap:14px}
    .timeline-item{
      display:grid; grid-template-columns:86px 1fr; gap:16px; align-items:start;
      padding:18px; background:#fff; border:1px solid var(--line); border-radius:18px;
    }
    .timeline-item strong{color:var(--brand)}
    .table-wrap{overflow: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 #edf2f7; text-align:left; vertical-align:top}
    th{background:#f7fbff; color:#20314a; font-size:.95rem}
    tr:last-child td{border-bottom:none}
    .badge{
      display:inline-flex; align-items:center; padding:6px 10px; border-radius:999px;
      background:#ecfdf5; color:#166534; border:1px solid #bbf7d0; font-size:.82rem; font-weight:700;
    }
    .badge.orange{background:#fff7ed; color:#9a3412; border-color:#fed7aa}
    .badge.blue{background:#eff6ff; color:#1d4ed8; border-color:#bfdbfe}
    .accordion{display:grid; gap:12px}
    details{
      background:#fff; border:1px solid var(--line); border-radius:18px; padding:2px 18px;
      box-shadow:0 8px 22px rgba(15,35,61,.04);
    }
    summary{
      list-style:none; cursor:pointer; padding:16px 0; font-weight:700; color:#1b2a3b;
    }
    summary::-webkit-details-marker{display:none}
    details p{margin:0 0 16px; color:var(--muted)}
    .reviews{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
    .review{
      background:linear-gradient(180deg,#fff,#f9fbff);
      border:1px solid var(--line); border-radius:22px; padding:20px;
    }
    .review .meta{display:flex; justify-content:space-between; gap:10px; align-items:center; margin-bottom:10px}
    .stars{color:#f59e0b; letter-spacing:1px}
    .review p{margin:10px 0 0; color:var(--muted)}
    .article-list{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
    .article{
      padding:20px; border-radius:22px; background:#fff; border:1px solid var(--line);
    }
    .article time{display:block; color:#6b7280; font-size:.88rem; margin-bottom:8px}
    .article a{font-weight:700}
    .form-wrap{
      display:grid; grid-template-columns:1.05fr .95fr; gap:16px;
    }
    form{
      background:#fff; border:1px solid var(--line); border-radius:24px; padding:22px; box-shadow:var(--shadow)
    }
    .field-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:14px}
    label{display:block; font-weight:700; margin-bottom:8px; font-size:.94rem}
    input,select,textarea{
      width:100%; border:1px solid #d8e3f0; border-radius:14px; padding:12px 14px;
      font:inherit; color:var(--text); background:#fbfdff; outline:none;
    }
    input:focus,select:focus,textarea:focus{border-color:#8bb3ff; box-shadow:0 0 0 4px rgba(31,111,235,.10)}
    textarea{min-height:130px; resize:vertical}
    .support-box{
      background:linear-gradient(180deg,#ffffff,#f7fbff);
      border:1px solid var(--line); border-radius:24px; padding:22px; box-shadow:var(--shadow)
    }
    .support-qr{display:flex; align-items:center; gap:16px; margin-top:16px}
    .support-qr img{width:124px; border-radius:18px; border:1px solid var(--line); background:#fff}
    .support-list{margin:14px 0 0; padding-left:18px}
    footer{
      margin-top:28px;
      background:#eff5fb;
      border-top:1px solid #dbe5f1;
      color:#20314a;
    }
    footer a{color:#1d4ed8}
    .footer-grid{
      display:grid; grid-template-columns:1.15fr .85fr .9fr; gap:18px;
      padding:28px 0;
    }
    .footer-note{border-top:1px solid #d8e3f0; padding:14px 0 20px; color:#5d6b7c; font-size:.92rem}
    .floating{
      position:fixed; right:16px; bottom:16px; z-index:50; display:grid; gap:10px;
    }
    .floating a,.floating button{
      width:52px; height:52px; border-radius:16px; border:1px solid var(--line);
      background:#fff; box-shadow:0 12px 26px rgba(15,35,61,.12); display:grid; place-items:center;
      color:var(--text); cursor:pointer;
    }
    .floating a:hover,.floating button:hover{transform:translateY(-2px)}
    .scroll-reveal{opacity:0; transform:translateY(18px); transition:opacity .7s ease, transform .7s ease}
    .scroll-reveal.show{opacity:1; transform:translateY(0)}
    .home-link{font-weight:700}
    .hero-bullets{display:grid; gap:10px; margin-top:18px}
    .hero-bullets div{display:flex; gap:10px; align-items:flex-start; color:#314155}
    .dot{width:9px; height:9px; border-radius:50%; margin-top:9px; background:linear-gradient(135deg,var(--brand),var(--brand-2))}
    .comparison-score{
      display:flex; flex-wrap:wrap; gap:12px; margin:14px 0 0;
    }
    .score-pill{
      padding:10px 14px; border-radius:999px; background:#eefbf7; border:1px solid #c8f0e3; color:#0f766e; font-weight:700;
    }
    .mini-links{display:flex; flex-wrap:wrap; gap:10px}
    .mini-links a{
      padding:8px 12px; border-radius:12px; border:1px solid var(--line); background:#fff; color:#243548;
    }
    .mini-links a:hover{border-color:#b6cae2; background:#f7fbff}
    @media (max-width: 1024px){
      .hero-grid,.form-wrap,.footer-grid,.grid-3,.reviews,.article-list{grid-template-columns:1fr}
      .grid-2{grid-template-columns:1fr}
      .nav-links{display:none}
      .menu-toggle{display:inline-grid; place-items:center}
      .nav.open .nav-links{
        display:flex; position:absolute; left:16px; right:16px; top:72px; flex-direction:column;
        background:#fff; border:1px solid var(--line); border-radius:18px; padding:12px; box-shadow:var(--shadow); align-items:stretch;
      }
      .nav.open .nav-actions{margin-left:auto}
      .field-grid{grid-template-columns:1fr}
    }
    @media (max-width: 640px){
      .hero-card,.mini-panel,form,.support-box{padding:20px}
      .section-head{flex-direction:column; align-items:flex-start}
      h1{font-size:2rem}
      .nav{min-height:68px}
      .brand h2{font-size:.98rem}
      .support-qr{flex-direction:column; align-items:flex-start}
      .timeline-item{grid-template-columns:1fr}
      .floating{right:12px; bottom:12px}
    }