:root{
      --bg:#f4f7fb;
      --panel:#ffffff;
      --panel-2:#eef4ff;
      --text:#102033;
      --muted:#5a6b82;
      --line:#d8e1ee;
      --primary:#165dff;
      --primary-2:#0b3ea8;
      --accent:#00a3ff;
      --gold:#f6b84e;
      --shadow:0 18px 40px rgba(18,47,87,.10);
      --radius:22px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:Inter,system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(22,93,255,.10), transparent 26%),
        radial-gradient(circle at right 20%, rgba(0,163,255,.10), transparent 18%),
        linear-gradient(180deg, #f7fbff 0%, #f4f7fb 38%, #eef4ff 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(100% - 32px, var(--container)); margin:0 auto}
    .site-header{
      position:sticky; top:0; z-index:50;
      backdrop-filter: blur(14px);
      background:rgba(244,247,251,.82);
      border-bottom:1px solid rgba(216,225,238,.8);
    }
    .nav{
      display:flex; align-items:center; justify-content:space-between; gap:16px;
      min-height:74px;
    }
    .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 18px rgba(22,93,255,.10)}
    .brand-text{min-width:0}
    .brand-text strong{display:block; font-size:18px; letter-spacing:.5px}
    .brand-text span{display:block; font-size:12px; color:var(--muted)}
    .nav-toggle{
      display:none; border:1px solid var(--line); background:#fff; color:var(--text);
      padding:10px 12px; border-radius:12px; box-shadow:0 8px 18px rgba(18,47,87,.06);
    }
    .nav-links{display:flex; align-items:center; gap:4px; flex-wrap:wrap; justify-content:flex-end}
    .nav-links a{
      padding:10px 12px; border-radius:12px; color:#29415f; font-size:14px;
      transition:.25s ease;
    }
    .nav-links a:hover,.nav-links a:focus-visible{background:#eaf1ff; color:var(--primary)}
    .nav-cta{
      display:inline-flex; align-items:center; gap:8px;
      padding:11px 16px; border-radius:999px;
      background:linear-gradient(135deg, var(--primary), #1d8bff);
      color:#fff !important; box-shadow:0 14px 28px rgba(22,93,255,.24);
    }
    .hero{
      padding:34px 0 18px;
    }
    .hero-grid{
      display:grid; grid-template-columns:1.2fr .8fr; gap:24px; align-items:stretch;
    }
    .hero-copy{
      background:
        linear-gradient(180deg, rgba(255,255,255,.92), rgba(240,246,255,.94)),
        linear-gradient(135deg, rgba(22,93,255,.08), rgba(0,163,255,.06));
      border:1px solid rgba(216,225,238,.9);
      border-radius:28px;
      padding:34px;
      box-shadow:var(--shadow);
      position:relative;
      overflow:hidden;
    }
    .hero-copy::after{
      content:"";
      position:absolute; inset:auto -40px -60px auto;
      width:220px; height:220px; border-radius:50%;
      background:radial-gradient(circle, rgba(22,93,255,.15), transparent 65%);
      pointer-events:none;
    }
    .eyebrow{
      display:inline-flex; align-items:center; gap:8px;
      padding:8px 12px; border-radius:999px;
      background:#eaf1ff; color:var(--primary-2); font-size:13px; font-weight:600;
      border:1px solid rgba(22,93,255,.12);
    }
    h1{margin:16px 0 12px; font-size:clamp(30px, 5vw, 52px); line-height:1.08}
    .hero p{margin:0; color:var(--muted); font-size:16px; line-height:1.85; max-width:62ch}
    .hero-actions{display:flex; flex-wrap:wrap; gap:12px; margin-top:24px}
    .btn{
      display:inline-flex; align-items:center; justify-content:center; gap:8px;
      padding:13px 18px; border-radius:14px; border:1px solid transparent;
      font-weight:700; transition:transform .2s ease, box-shadow .2s ease, background .2s ease;
      cursor:pointer;
    }
    .btn:hover{transform:translateY(-2px)}
    .btn-primary{background:linear-gradient(135deg, var(--primary), #1d8bff); color:#fff; box-shadow:0 14px 24px rgba(22,93,255,.22)}
    .btn-ghost{background:#fff; color:var(--primary-2); border-color:var(--line)}
    .hero-metrics{
      display:grid; grid-template-columns:repeat(2,1fr); gap:14px;
    }
    .metric, .card, .review, .faq-item, .timeline-item, .price-box, .compare-box, .form-card, .case-card, .news-card, .channel-card, .help-card, .tag-cloud, .about-card{
      background:var(--panel);
      border:1px solid rgba(216,225,238,.9);
      border-radius:var(--radius);
      box-shadow:var(--shadow);
    }
    .metric{padding:20px}
    .metric strong{display:block; font-size:28px; color:var(--primary)}
    .metric span{display:block; margin-top:6px; color:var(--muted); font-size:14px; line-height:1.6}
    .hero-visual{
      display:grid; gap:14px;
      grid-template-rows:auto auto;
    }
    .visual-panel{
      border-radius:28px;
      border:1px solid rgba(216,225,238,.9);
      background:
        linear-gradient(135deg, rgba(22,93,255,.94), rgba(18,47,87,.94));
      color:#fff;
      padding:26px;
      box-shadow:var(--shadow);
      min-height:220px;
      display:flex; flex-direction:column; justify-content:space-between;
      overflow:hidden;
      position:relative;
    }
    .visual-panel::before{
      content:"";
      position:absolute; inset:18px 18px auto auto;
      width:140px; height:140px; border-radius:50%;
      background:radial-gradient(circle, rgba(255,255,255,.22), transparent 68%);
    }
    .visual-panel h2,.visual-panel p{margin:0}
    .visual-panel h2{font-size:24px; line-height:1.2; max-width:12ch}
    .visual-panel p{opacity:.88; line-height:1.7; max-width:32ch}
    .quick-tags{display:flex; flex-wrap:wrap; gap:10px}
    .quick-tags span{
      padding:9px 11px; border-radius:999px; background:#fff; color:#16355f; font-size:13px;
      border:1px solid rgba(255,255,255,.18)
    }
    main{padding:10px 0 34px}
    section{padding:16px 0}
    .section-head{display:flex; align-items:flex-end; justify-content:space-between; gap:18px; margin-bottom:16px}
    .section-head h2{margin:0; font-size:28px}
    .section-head p{margin:0; color:var(--muted); line-height:1.7; max-width:56ch}
    .grid-3{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
    .grid-4{display:grid; grid-template-columns:repeat(4,1fr); gap:16px}
    .card{padding:22px; transition:transform .22s ease, box-shadow .22s ease}
    .card:hover,.case-card:hover,.review:hover,.news-card:hover,.help-card:hover{transform:translateY(-4px)}
    .card h3,.case-card h3,.help-card h3,.review h3{margin:0 0 10px; font-size:18px}
    .card p,.case-card p,.help-card p,.review p,.news-card p{margin:0; color:var(--muted); line-height:1.75}
    .badge{
      display:inline-flex; align-items:center; gap:6px;
      padding:7px 10px; border-radius:999px; background:#eef4ff; color:var(--primary-2);
      font-size:12px; font-weight:700; margin-bottom:14px;
    }
    .icon{
      width:42px; height:42px; border-radius:14px; display:grid; place-items:center;
      background:linear-gradient(135deg, #eaf1ff, #dcecff); color:var(--primary); font-weight:900;
      margin-bottom:14px;
    }
    .split{
      display:grid; grid-template-columns: .95fr 1.05fr; gap:16px; align-items:start;
    }
    .about-card{padding:24px}
    .about-list{display:grid; gap:12px; margin-top:18px}
    .about-item{
      display:flex; gap:12px; align-items:flex-start;
      padding:14px; border-radius:18px; background:#f8fbff; border:1px solid var(--line);
    }
    .about-item b{display:block; margin-bottom:4px}
    .about-item span{color:var(--muted); font-size:14px; line-height:1.7}
    .ribbon{
      display:flex; flex-wrap:wrap; gap:10px; margin-top:16px
    }
    .ribbon span{padding:8px 12px; border-radius:999px; background:#f0f5ff; border:1px solid var(--line); color:#27405e; font-size:13px}
    .steps{display:grid; grid-template-columns:repeat(4,1fr); gap:16px}
    .step{padding:22px; position:relative}
    .step .num{font-size:13px; color:var(--primary); font-weight:800; letter-spacing:.06em}
    table{
      width:100%; border-collapse:separate; border-spacing:0; overflow:hidden;
      border:1px solid var(--line); border-radius:20px; background:#fff;
    }
    th,td{padding:14px 14px; text-align:left; border-bottom:1px solid #e8edf5; vertical-align:top}
    th{background:#edf4ff; color:#16355f}
    tr:last-child td{border-bottom:none}
    .table-wrap{overflow:auto; border-radius:20px; box-shadow:var(--shadow)}
    .scroll-note{margin-top:10px; color:var(--muted); font-size:13px}
    .compare-highlight{
      display:grid; grid-template-columns:repeat(3,1fr); gap:16px; margin-top:16px;
    }
    .compare-box{padding:20px}
    .compare-box strong{display:block; font-size:26px; color:var(--primary)}
    .compare-box span{display:block; color:var(--muted); margin-top:6px; line-height:1.6}
    .tag-cloud{padding:22px}
    .tag-cloud .tags{display:flex; flex-wrap:wrap; gap:10px}
    .tag-cloud .tags span{padding:8px 12px; border-radius:999px; background:#f2f6ff; border:1px solid var(--line); color:#27405e; font-size:13px}
    .media-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:14px}
    .media-grid .img-card{
      border-radius:20px; overflow:hidden; border:1px solid var(--line); background:#fff; box-shadow:var(--shadow)
    }
    .media-grid img{width:100%; aspect-ratio:16/10; object-fit:cover}
    .media-grid .img-card .cap{padding:14px; color:#36506f; font-size:14px}
    .review-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
    .review{padding:20px}
    .review .meta{display:flex; justify-content:space-between; gap:10px; margin-top:14px; color:#36506f; font-size:13px}
    .stars{color:#f4a024; letter-spacing:2px}
    .news-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
    .news-card{padding:20px}
    .news-card .date{display:inline-flex; margin-bottom:12px; color:var(--primary-2); background:#edf4ff; padding:6px 10px; border-radius:999px; font-size:12px; font-weight:700}
    .news-card a{color:var(--primary); font-weight:700}
    .contact-grid{display:grid; grid-template-columns:.96fr 1.04fr; gap:16px}
    .form-card,.help-card{padding:22px}
    .form-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:12px}
    .field{display:flex; flex-direction:column; gap:8px}
    .field.full{grid-column:1 / -1}
    label{font-size:14px; font-weight:700; color:#2d4562}
    input,select,textarea{
      width:100%; border:1px solid var(--line); border-radius:14px; padding:12px 14px;
      font:inherit; color:var(--text); background:#fff; outline:none;
    }
    input:focus,select:focus,textarea:focus{border-color:#7aa7ff; box-shadow:0 0 0 4px rgba(22,93,255,.10)}
    textarea{min-height:124px; resize:vertical}
    .submit-row{display:flex; flex-wrap:wrap; gap:12px; margin-top:14px}
    .timeline{display:grid; gap:14px}
    .timeline-item{padding:18px 20px; display:flex; gap:14px; align-items:flex-start}
    .timeline-item .dot{
      width:14px; height:14px; border-radius:50%; margin-top:6px; background:linear-gradient(135deg, var(--primary), #1d8bff); box-shadow:0 0 0 6px rgba(22,93,255,.10)
    }
    .timeline-item b{display:block; margin-bottom:4px}
    .faq{display:grid; gap:12px}
    .faq-item{overflow:hidden}
    .faq-q{
      width:100%; background:none; border:0; padding:18px 20px; text-align:left;
      display:flex; align-items:center; justify-content:space-between; gap:14px; color:var(--text); font:inherit; font-weight:700; cursor:pointer;
    }
    .faq-a{max-height:0; overflow:hidden; transition:max-height .28s ease; padding:0 20px}
    .faq-item.open .faq-a{max-height:180px; padding-bottom:18px}
    .faq-a p{margin:0; color:var(--muted); line-height:1.8}
    .footer{
      padding:18px 0 28px;
      color:#dfe9f7;
      background:linear-gradient(135deg, #0b2252, #113a86);
      margin-top:18px;
    }
    .footer a{color:#ffffff}
    .footer-grid{display:grid; grid-template-columns:1.1fr .9fr; gap:18px; align-items:start}
    .footer-card{
      border:1px solid rgba(255,255,255,.12);
      background:rgba(255,255,255,.06);
      border-radius:24px;
      padding:20px;
    }
    .footer small{color:#d5e2f7}
    .footer-links{display:flex; flex-wrap:wrap; gap:10px; margin-top:12px}
    .footer-links a{padding:8px 10px; border-radius:999px; background:rgba(255,255,255,.08)}
    .float-box{
      position:fixed; right:18px; bottom:18px; z-index:60;
      display:grid; gap:10px;
    }
    .float-btn{
      width:54px; height:54px; border-radius:18px; border:0; cursor:pointer;
      display:grid; place-items:center; background:linear-gradient(135deg, var(--primary), #1d8bff); color:#fff;
      box-shadow:0 18px 28px rgba(22,93,255,.25);
    }
    .float-panel{
      display:none; position:absolute; right:0; bottom:64px; width:280px;
      background:#fff; border:1px solid var(--line); border-radius:20px; box-shadow:var(--shadow); padding:16px;
    }
    .float-panel.open{display:block}
    .float-panel img{width:100%; border-radius:16px; border:1px solid var(--line)}
    .float-panel p{margin:10px 0 0; color:var(--muted); line-height:1.7; font-size:14px}
    .anchor-space{scroll-margin-top:92px}
    .mini-note{font-size:13px; color:var(--muted); margin-top:10px; line-height:1.7}
    .divider{height:1px; background:linear-gradient(90deg, transparent, var(--line), transparent); margin:14px 0}
    @media (max-width: 1024px){
      .hero-grid,.split,.contact-grid,.footer-grid{grid-template-columns:1fr}
      .grid-4,.steps,.grid-3,.review-grid,.news-grid,.media-grid,.compare-highlight{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width: 760px){
      .nav-toggle{display:inline-flex}
      .nav-links{
        display:none; position:absolute; left:16px; right:16px; top:74px;
        padding:12px; background:#fff; border:1px solid var(--line); border-radius:18px; box-shadow:var(--shadow);
      }
      .nav-links.open{display:flex; flex-direction:column; align-items:stretch}
      .nav-links a{padding:12px 14px}
      .nav{position:relative}
      .hero{padding-top:22px}
      .hero-copy{padding:24px}
      .hero-metrics,.grid-4,.steps,.grid-3,.review-grid,.news-grid,.media-grid,.compare-highlight,.form-grid{grid-template-columns:1fr}
      .section-head{flex-direction:column; align-items:flex-start}
      .float-box{right:12px; bottom:12px}
      h1{font-size:30px}
      .btn{width:100%}
    }
    .reveal{opacity:0; transform:translateY(18px); transition:opacity .6s ease, transform .6s ease}
    .reveal.show{opacity:1; transform:translateY(0)}
    .rating{
      display:flex; align-items:center; gap:10px; flex-wrap:wrap; margin-top:12px
    }
    .score{
      display:inline-flex; align-items:center; gap:8px;
      padding:8px 12px; border-radius:999px; background:#eef4ff; color:#16355f; font-size:13px; font-weight:700;
    }