:root{
      --bg:#f6f8fc;
      --bg2:#eef3ff;
      --card:#ffffff;
      --line:#dbe3f1;
      --text:#122033;
      --muted:#5b6b84;
      --brand:#4f7cff;
      --brand2:#8a5cff;
      --accent:#00c2ff;
      --shadow:0 18px 50px rgba(18,32,51,.09);
      --shadow2:0 12px 30px rgba(79,124,255,.16);
      --radius:20px;
      --radius2:28px;
      --max:1200px;
    }
    *{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",Arial,sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(79,124,255,.12), transparent 30%),
        radial-gradient(circle at top right, rgba(0,194,255,.10), transparent 25%),
        linear-gradient(180deg, #fbfcff 0%, #f3f6fc 46%, #f7f8fc 100%);
      overflow-x:hidden;
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(100% - 32px, var(--max)); margin:0 auto}
    .site-header{
      position:sticky; top:0; z-index:50;
      backdrop-filter:saturate(180%) blur(14px);
      background:rgba(247,248,252,.88);
      border-bottom:1px solid rgba(219,227,241,.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; box-shadow:0 8px 24px rgba(18,32,51,.08)}
    .brand-text{min-width:0}
    .brand-text strong{display:block; font-size:1.05rem; letter-spacing:.5px}
    .brand-text span{display:block; font-size:.82rem; color:var(--muted); margin-top:2px}
    .nav-links{display:flex; align-items:center; gap:18px; flex-wrap:wrap; justify-content:flex-end}
    .nav-links a{font-size:.95rem; color:#29405f; padding:8px 0; position:relative}
    .nav-links a::after{
      content:""; position:absolute; left:0; bottom:2px; width:0; height:2px; background:linear-gradient(90deg,var(--brand),var(--accent));
      transition:.25s ease;
    }
    .nav-links a:hover::after,.nav-links a:focus::after{width:100%}
    .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:999px;
      padding:12px 18px; font-weight:700; cursor:pointer;
      transition:transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
      white-space:nowrap;
    }
    .btn:hover{transform:translateY(-1px); box-shadow:var(--shadow2)}
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2)); color:#fff}
    .btn-ghost{background:#fff; color:var(--text); border-color:var(--line)}
    .menu-toggle{
      display:none; width:44px; height:44px; border-radius:12px;
      border:1px solid var(--line); background:#fff; color:var(--text);
    }
    .hero{
      position:relative;
      padding:54px 0 28px;
      overflow:hidden;
    }
    .hero::before{
      content:""; position:absolute; inset:auto -80px 0 auto; width:280px; height:280px; border-radius:50%;
      background:radial-gradient(circle, rgba(79,124,255,.22), transparent 64%);
      filter:blur(10px); pointer-events:none;
    }
    .hero-grid{
      display:grid; grid-template-columns:1.2fr .8fr; gap:24px; align-items:stretch;
    }
    .hero-main{
      background:linear-gradient(160deg, rgba(255,255,255,.95), rgba(245,248,255,.86));
      border:1px solid rgba(219,227,241,.9);
      border-radius:var(--radius2);
      box-shadow:var(--shadow);
      padding:34px;
      position:relative;
      overflow:hidden;
    }
    .hero-main::after{
      content:""; position:absolute; inset:auto -60px -70px auto; width:220px; height:220px; border-radius:50%;
      background:linear-gradient(135deg, rgba(79,124,255,.16), rgba(0,194,255,.14));
    }
    .eyebrow{
      display:inline-flex; align-items:center; gap:8px;
      padding:8px 12px; border-radius:999px; background:#eef4ff; color:#3153b9;
      font-size:.86rem; font-weight:700;
    }
    h1{margin:18px 0 14px; font-size:clamp(2rem,5vw,3.8rem); line-height:1.08; letter-spacing:-.03em}
    .lead{margin:0; color:var(--muted); font-size:1.05rem; line-height:1.8; max-width:56ch}
    .hero-actions{display:flex; flex-wrap:wrap; gap:12px; margin-top:24px}
    .hero-points{display:grid; grid-template-columns:repeat(3,1fr); gap:12px; margin-top:26px}
    .point{
      background:#fff; border:1px solid var(--line); border-radius:18px; padding:14px 14px 12px; box-shadow:0 8px 22px rgba(18,32,51,.04)
    }
    .point strong{display:block; font-size:1.05rem}
    .point span{display:block; margin-top:6px; color:var(--muted); font-size:.9rem; line-height:1.6}
    .hero-side{
      display:grid; gap:14px;
    }
    .side-card{
      background:linear-gradient(180deg,#0f1726,#17233b);
      color:#f3f7ff;
      border-radius:var(--radius2);
      padding:24px;
      box-shadow:var(--shadow);
      border:1px solid rgba(255,255,255,.08);
    }
    .side-card h2,.section-title{margin:0}
    .side-card h2{font-size:1.2rem}
    .side-card p{margin:10px 0 0; color:#c8d5f4; line-height:1.75}
    .mini-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:12px; margin-top:16px}
    .mini{
      background:rgba(255,255,255,.07); border:1px solid rgba(255,255,255,.08); border-radius:16px; padding:14px
    }
    .mini strong{display:block; font-size:1.02rem}
    .mini span{display:block; margin-top:5px; color:#bfd0ef; font-size:.88rem}
    section{padding:26px 0}
    .section-head{display:flex; align-items:end; justify-content:space-between; gap:16px; margin-bottom:16px}
    .section-title{font-size:1.65rem; line-height:1.2}
    .section-desc{color:var(--muted); margin:6px 0 0; line-height:1.7}
    .grid-4{display:grid; grid-template-columns:repeat(4,1fr); gap:16px}
    .grid-3{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
    .card{
      background:var(--card);
      border:1px solid var(--line);
      border-radius:var(--radius);
      box-shadow:0 10px 26px rgba(18,32,51,.05);
      padding:20px;
      transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease;
    }
    .card:hover{transform:translateY(-3px); box-shadow:var(--shadow); border-color:#c6d4ef}
    .card h3{margin:0 0 10px; font-size:1.08rem}
    .card p{margin:0; color:var(--muted); line-height:1.72}
    .metric{
      display:flex; flex-direction:column; gap:10px;
      background:linear-gradient(180deg,#fff, #f7f9ff);
    }
    .metric .num{font-size:2rem; font-weight:800; letter-spacing:-.03em; background:linear-gradient(135deg,var(--brand),var(--brand2)); -webkit-background-clip:text; background-clip:text; color:transparent}
    .metric small{color:var(--muted)}
    .pill-row{display:flex; flex-wrap:wrap; gap:10px}
    .pill{
      padding:10px 14px; border-radius:999px; background:#eef4ff; border:1px solid #d9e4ff; color:#3555b7; font-size:.92rem; font-weight:600
    }
    .split{
      display:grid; grid-template-columns:1.05fr .95fr; gap:16px; align-items:start;
    }
    .panel{
      background:linear-gradient(180deg,#fff,#f8fbff);
      border:1px solid var(--line);
      border-radius:var(--radius2);
      padding:22px;
      box-shadow:var(--shadow);
    }
    .timeline{display:grid; gap:12px}
    .step{
      display:grid; grid-template-columns:auto 1fr; gap:14px; padding:16px; border:1px solid var(--line); border-radius:18px; background:#fff
    }
    .step-badge{
      width:38px; height:38px; border-radius:12px; display:grid; place-items:center;
      background:linear-gradient(135deg,var(--brand),var(--accent)); color:#fff; font-weight:800
    }
    .step strong{display:block; margin-bottom:5px}
    .step span{color:var(--muted); line-height:1.65}
    .table-wrap{overflow-x:auto; border:1px solid var(--line); border-radius:18px; background:#fff; box-shadow:var(--shadow)}
    table{width:100%; border-collapse:collapse; min-width:760px}
    th,td{padding:16px 14px; text-align:left; border-bottom:1px solid #edf1f7; vertical-align:top}
    th{background:#f7f9ff; font-size:.95rem}
    td{color:#2c3f58}
    .rating{display:inline-flex; align-items:center; gap:8px; padding:8px 12px; background:#eef7ff; color:#1d57a6; border-radius:999px; font-weight:700}
    .list-check{display:grid; gap:10px; margin:0; padding:0; list-style:none}
    .list-check li{
      position:relative; padding-left:24px; color:var(--text); line-height:1.7
    }
    .list-check li::before{
      content:""; position:absolute; left:0; top:9px; width:12px; height:12px; border-radius:50%;
      background:linear-gradient(135deg,var(--brand),var(--accent));
      box-shadow:0 0 0 4px rgba(79,124,255,.12);
    }
    .two-col{display:grid; grid-template-columns:repeat(2,1fr); gap:16px}
    .review{
      display:flex; flex-direction:column; gap:12px; height:100%;
      background:linear-gradient(180deg,#fff,#f8fbff);
    }
    .review .who{display:flex; align-items:center; justify-content:space-between; gap:10px}
    .review .avatar{
      width:44px; height:44px; border-radius:14px; display:grid; place-items:center; color:#fff; font-weight:800;
      background:linear-gradient(135deg,var(--brand),var(--brand2));
    }
    .review .meta{flex:1}
    .review .meta strong{display:block}
    .review .meta span{display:block; color:var(--muted); font-size:.9rem; margin-top:3px}
    .quote{color:#20314a; line-height:1.8}
    .tag-cloud{display:flex; flex-wrap:wrap; gap:10px}
    .tag-cloud a{
      padding:9px 12px; border-radius:999px; border:1px solid var(--line); background:#fff; color:#314463; font-size:.92rem;
      transition:.2s ease;
    }
    .tag-cloud a:hover{border-color:#aec0ea; box-shadow:var(--shadow2); transform:translateY(-1px)}
    .accordion{display:grid; gap:12px}
    .faq-item{
      border:1px solid var(--line); border-radius:18px; background:#fff; overflow:hidden; box-shadow:0 8px 22px rgba(18,32,51,.04)
    }
    .faq-q{
      width:100%; text-align:left; padding:16px 18px; background:transparent; border:0; font-size:1rem; font-weight:700; color:var(--text);
      display:flex; justify-content:space-between; align-items:center; gap:14px; cursor:pointer;
    }
    .faq-a{
      max-height:0; overflow:hidden; transition:max-height .28s ease;
    }
    .faq-a p{margin:0; padding:0 18px 16px; color:var(--muted); line-height:1.75}
    .faq-item.active .faq-a{max-height:220px}
    .faq-item.active .chev{transform:rotate(180deg)}
    .chev{transition:transform .25s ease}
    .article-list{display:grid; gap:12px}
    .article-item{
      display:flex; justify-content:space-between; gap:14px; align-items:flex-start; padding:16px 18px;
      border:1px solid var(--line); border-radius:18px; background:#fff
    }
    .article-item strong{display:block; margin-bottom:6px}
    .article-item span{color:var(--muted); line-height:1.65}
    .form-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:14px}
    .field{display:flex; flex-direction:column; gap:8px}
    label{font-weight:700; font-size:.95rem}
    input,select,textarea{
      width:100%; border:1px solid #d7e0ef; border-radius:14px; padding:13px 14px; font:inherit; color:var(--text); background:#fff;
      outline:none; transition:border-color .2s ease, box-shadow .2s ease;
    }
    textarea{min-height:120px; resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#8fb0ff; box-shadow:0 0 0 4px rgba(79,124,255,.12)}
    .full{grid-column:1/-1}
    .footer{
      margin-top:18px;
      background:#0f1726;
      color:#d8e3f9;
      padding:28px 0 20px;
      border-top:1px solid rgba(255,255,255,.08);
    }
    .footer a{color:#f0f5ff}
    .footer-grid{display:grid; grid-template-columns:1.3fr .9fr .8fr; gap:18px}
    .footer .card{background:rgba(255,255,255,.04); border-color:rgba(255,255,255,.08); box-shadow:none}
    .footer .section-desc,.footer p,.footer li,.footer span{color:#b6c4df}
    .footer-links{display:flex; flex-wrap:wrap; gap:10px}
    .footer-links a{padding:8px 11px; border-radius:999px; background:rgba(255,255,255,.06)}
    .copyright{margin-top:18px; padding-top:18px; border-top:1px solid rgba(255,255,255,.08); color:#9eb0d3; font-size:.92rem}
    .float-tools{
      position:fixed; right:16px; bottom:16px; z-index:60; display:grid; gap:10px;
    }
    .float-tools a,.float-tools button{
      width:48px; height:48px; border-radius:16px; border:1px solid rgba(219,227,241,.9); background:#fff; color:var(--text);
      box-shadow:var(--shadow); display:grid; place-items:center; cursor:pointer;
    }
    .float-tools .primary{background:linear-gradient(135deg,var(--brand),var(--brand2)); color:#fff; border-color:transparent}
    .fade-in{opacity:0; transform:translateY(16px); transition:opacity .7s ease, transform .7s ease}
    .fade-in.show{opacity:1; transform:none}
    .image-row{display:grid; grid-template-columns:repeat(4,1fr); gap:14px}
    .image-row img{
      width:100%; aspect-ratio:1/1; object-fit:cover; border-radius:18px; border:1px solid var(--line); background:#fff; box-shadow:var(--shadow)
    }
    .wide-image-row{display:grid; grid-template-columns:repeat(2,1fr); gap:14px}
    .wide-image-row img{width:100%; aspect-ratio:16/9; object-fit:cover; border-radius:20px; border:1px solid var(--line); box-shadow:var(--shadow)}
    .topnote{
      display:flex; justify-content:space-between; gap:14px; flex-wrap:wrap; align-items:center; margin-top:16px
    }
    .badge{
      padding:8px 12px; border-radius:999px; background:#edf5ff; color:#2d57b2; border:1px solid #dce8ff; font-weight:700; font-size:.9rem
    }
    .scroll-indicator{
      display:flex; align-items:center; gap:10px; color:var(--muted); font-size:.9rem;
    }
    .dot{width:9px; height:9px; border-radius:50%; background:linear-gradient(135deg,var(--brand),var(--accent)); box-shadow:0 0 0 6px rgba(79,124,255,.12)}
    @media (max-width: 1080px){
      .hero-grid,.split,.footer-grid{grid-template-columns:1fr}
      .grid-4{grid-template-columns:repeat(2,1fr)}
      .grid-3,.two-col,.image-row,.wide-image-row{grid-template-columns:repeat(2,1fr)}
      .hero-points{grid-template-columns:1fr}
      .nav-links{display:none}
      .menu-toggle{display:inline-grid; place-items:center}
      .nav.open .nav-links{
        display:flex; flex-direction:column; align-items:flex-start; width:100%; padding:14px 0 2px; gap:10px
      }
      .nav.open{flex-wrap:wrap}
      .nav.open .nav-actions{width:100%}
    }
    @media (max-width: 720px){
      .container{width:min(100% - 22px, var(--max))}
      .hero{padding-top:26px}
      .hero-main,.panel{padding:20px}
      .grid-4,.grid-3,.two-col,.form-grid,.image-row,.wide-image-row{grid-template-columns:1fr}
      .section-head{align-items:flex-start; flex-direction:column}
      .article-item{flex-direction:column}
      .nav{padding:12px 0}
      .brand-text span{display:none}
      .hero-actions{flex-direction:column}
      .btn{width:100%}
      .float-tools{right:12px; bottom:12px}
    }