:root{
      --bg:#f7f7fb;
      --surface:#ffffff;
      --surface-2:#f2f5ff;
      --surface-3:#fff4ef;
      --text:#172033;
      --muted:#5f6a80;
      --line:#e6e9f2;
      --primary:#ff4d5e;
      --primary-2:#6a5cff;
      --accent:#12b8a6;
      --gold:#ffb547;
      --shadow:0 18px 50px rgba(28,38,60,.10);
      --shadow-soft:0 10px 30px rgba(28,38,60,.08);
      --radius:22px;
      --radius-sm:14px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at 12% 8%, rgba(255,77,94,.12), transparent 22%),
        radial-gradient(circle at 82% 10%, rgba(106,92,255,.12), transparent 24%),
        linear-gradient(180deg, #fff 0%, #fbfbfe 16%, #f7f8fc 100%);
      line-height:1.65;
      overflow-x:hidden;
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{
      width:min(var(--container), calc(100% - 32px));
      margin:0 auto;
    }
    .skip{position:absolute;left:-9999px}
    header{
      position:sticky;top:0;z-index:50;
      backdrop-filter:saturate(180%) blur(16px);
      background:rgba(255,255,255,.82);
      border-bottom:1px solid rgba(230,233,242,.8);
    }
    .nav{
      display:flex;align-items:center;justify-content:space-between;gap:18px;
      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}
    .brand-text{display:flex;flex-direction:column;min-width:0}
    .brand-text strong{font-size:18px;line-height:1.1}
    .brand-text span{font-size:12px;color:var(--muted)}
    .nav-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:#2d3954;padding:8px 0;position:relative}
    .nav-links a::after{
      content:"";position:absolute;left:0;bottom:2px;width:0;height:2px;border-radius:999px;
      background:linear-gradient(90deg,var(--primary),var(--primary-2));transition:.25s ease;
    }
    .nav-links a:hover::after,.nav-links a:focus::after{width:100%}
    .nav-cta{display:flex;align-items:center;gap:10px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      padding:12px 18px;border-radius:999px;border:1px solid transparent;
      font-weight:700;font-size:14px;transition:.25s ease;cursor:pointer;
      box-shadow:0 10px 24px rgba(255,77,94,.12);
    }
    .btn-primary{
      background:linear-gradient(135deg,var(--primary),#ff7a4b);
      color:#fff;
    }
    .btn-secondary{
      background:#fff;border-color:var(--line);color:var(--text);
    }
    .btn:hover{transform:translateY(-2px);box-shadow:0 16px 30px rgba(31,42,68,.14)}
    .menu-toggle{
      display:none;border:1px solid var(--line);background:#fff;color:var(--text);
      width:44px;height:44px;border-radius:14px;align-items:center;justify-content:center;
    }
    .menu-toggle span{display:block;width:18px;height:2px;background:currentColor;position:relative}
    .menu-toggle span::before,.menu-toggle span::after{
      content:"";position:absolute;left:0;width:18px;height:2px;background:currentColor
    }
    .menu-toggle span::before{top:-6px}.menu-toggle span::after{top:6px}
    main{display:block}
    .hero{
      padding:44px 0 26px;
      position:relative;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.15fr .85fr;gap:26px;align-items:stretch;
    }
    .hero-panel,.hero-side{
      border:1px solid rgba(230,233,242,.9);
      border-radius:28px;
      background:
        linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.84)),
        linear-gradient(135deg, rgba(255,77,94,.06), rgba(106,92,255,.05));
      box-shadow:var(--shadow);
    }
    .hero-panel{padding:38px;position:relative;overflow:hidden}
    .hero-panel::before{
      content:"";position:absolute;inset:-40px -20px auto auto;width:260px;height:260px;border-radius:50%;
      background:radial-gradient(circle, rgba(255,77,94,.16), rgba(255,77,94,0) 65%);
      pointer-events:none;
    }
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;
      background:rgba(18,184,166,.10);color:#11786e;font-size:13px;font-weight:700;border:1px solid rgba(18,184,166,.16);
    }
    h1{margin:16px 0 14px;font-size:clamp(32px, 4vw, 56px);line-height:1.08;letter-spacing:-.03em}
    .hero p{margin:0;color:var(--muted);font-size:16px;max-width:62ch}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}
    .hero-points{
      display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:26px
    }
    .mini-stat{
      background:linear-gradient(180deg,#fff,#fff8f7);
      border:1px solid var(--line);border-radius:18px;padding:16px;
    }
    .mini-stat strong{display:block;font-size:22px;line-height:1.1}
    .mini-stat span{display:block;color:var(--muted);font-size:13px;margin-top:6px}
    .hero-side{padding:22px;display:flex;flex-direction:column;gap:16px}
    .side-card{
      background:#fff;border:1px solid var(--line);border-radius:20px;padding:18px
    }
    .side-card h2,.section-title h2{margin:0 0 8px;font-size:clamp(24px,3vw,34px);line-height:1.15}
    .section{padding:20px 0}
    .section-title{
      display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:16px;flex-wrap:wrap
    }
    .section-title p{margin:0;color:var(--muted);max-width:70ch}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
    .card{
      background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
      box-shadow:var(--shadow-soft);padding:20px;transition:transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    }
    .card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#d8def0}
    .stat{display:flex;flex-direction:column;gap:10px}
    .stat .num{font-size:28px;font-weight:800}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:9px 12px;border-radius:999px;background:linear-gradient(135deg,#fff,#f6f8ff);border:1px solid var(--line);font-size:13px;color:#30405f}
    .split{
      display:grid;grid-template-columns:1.05fr .95fr;gap:16px;align-items:start
    }
    .feature-list{display:grid;gap:12px}
    .feature-item{
      display:flex;gap:12px;align-items:flex-start;padding:14px;border-radius:18px;background:#fbfcff;border:1px solid var(--line)
    }
    .icon{
      width:38px;height:38px;border-radius:12px;flex:0 0 auto;
      display:grid;place-items:center;color:#fff;font-weight:800;
      background:linear-gradient(135deg,var(--primary),var(--primary-2));
      box-shadow:0 10px 20px rgba(106,92,255,.18);
    }
    .feature-item h3,.card h3{margin:0 0 8px;font-size:18px}
    .feature-item p,.card p{margin:0;color:var(--muted)}
    .flow{counter-reset:step}
    .flow .card{position:relative;padding-top:18px}
    .flow .card::before{
      counter-increment:step;content:counter(step, decimal-leading-zero);
      position:absolute;top:18px;right:18px;color:#cad1e3;font-weight:800;font-size:20px
    }
    .table-wrap{overflow-x:auto;border-radius:22px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow-soft)}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:16px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f7f8fd;font-size:14px;color:#33415f}
    td{color:#2a3550}
    .check{color:#0f8f7c;font-weight:700}
    .x{color:#d25c5c;font-weight:700}
    .compare-badge{
      display:inline-flex;align-items:center;gap:8px;padding:10px 14px;border-radius:999px;
      background:linear-gradient(135deg,rgba(255,77,94,.12),rgba(255,181,71,.14));border:1px solid rgba(255,77,94,.15)
    }
    .split-alt{display:grid;grid-template-columns:.92fr 1.08fr;gap:16px;align-items:start}
    .faq{display:grid;gap:12px}
    details{
      background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow-soft);overflow:hidden
    }
    summary{list-style:none;cursor:pointer;padding:18px 18px;font-weight:700;display:flex;align-items:center;justify-content:space-between;gap:12px}
    summary::-webkit-details-marker{display:none}
    summary::after{content:"+";font-size:22px;color:#8a94aa}
    details[open] summary::after{content:"–"}
    details .answer{padding:0 18px 18px;color:var(--muted)}
    .review{
      display:flex;flex-direction:column;gap:14px;height:100%
    }
    .review .meta{display:flex;align-items:center;justify-content:space-between;gap:12px}
    .stars{color:#ffb547;letter-spacing:2px;font-size:16px}
    .form{
      display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px
    }
    .field{display:flex;flex-direction:column;gap:8px}
    .field.full{grid-column:1/-1}
    label{font-size:14px;font-weight:700;color:#31405e}
    input,select,textarea{
      width:100%;border:1px solid var(--line);border-radius:14px;background:#fff;padding:13px 14px;
      font:inherit;color:var(--text);outline:none;transition:border-color .2s ease, box-shadow .2s ease
    }
    textarea{min-height:124px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#9ea8ff;box-shadow:0 0 0 4px rgba(106,92,255,.10)}
    .tips{
      display:grid;gap:10px
    }
    .tip{
      display:flex;gap:10px;align-items:flex-start;padding:12px 14px;border-radius:16px;background:#fbfcff;border:1px solid var(--line)
    }
    .timeline{display:grid;gap:12px}
    .timeline-item{
      display:grid;grid-template-columns:112px 1fr;gap:14px;padding:16px;border-radius:18px;border:1px solid var(--line);background:#fff
    }
    .timeline-item time{font-weight:800;color:#6a5cff}
    .footer-links{display:flex;flex-wrap:wrap;gap:12px}
    .footer-links a{color:#31405e}
    footer{
      margin-top:24px;padding:26px 0 20px;border-top:1px solid var(--line);background:#fff;color:var(--text)
    }
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:18px;align-items:start}
    .footer-note{color:var(--muted);font-size:14px;margin:10px 0 0}
    .floating{
      position:fixed;right:16px;bottom:16px;z-index:60;display:flex;flex-direction:column;gap:10px
    }
    .floating a,.floating button{
      width:52px;height:52px;border-radius:16px;border:none;display:grid;place-items:center;
      background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;box-shadow:var(--shadow);cursor:pointer
    }
    .floating .small{background:#fff;color:var(--text);border:1px solid var(--line)}
    .kefu{
      display:grid;grid-template-columns:88px 1fr;gap:14px;align-items:center
    }
    .ai-page-image{border-radius:18px;border:1px solid var(--line);box-shadow:var(--shadow-soft)}
    .center-badges{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
    .rating-box{
      padding:18px;border-radius:22px;background:linear-gradient(135deg,#fff4ef,#f7f4ff);border:1px solid rgba(255,77,94,.16)
    }
    .rating-line{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
    .rating-num{font-size:40px;font-weight:900;line-height:1;color:#ff4d5e}
    .muted{color:var(--muted)}
    .desktop-only{display:block}
    .mobile-only{display:none}
    .anchor{scroll-margin-top:92px}
    @media (max-width: 1024px){
      .hero-grid,.split,.split-alt,.footer-grid{grid-template-columns:1fr}
      .grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
      .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
      .nav-links{display:none}
      .menu-toggle{display:inline-flex}
      .nav.open .nav-links{
        display:flex;position:absolute;left:16px;right:16px;top:74px;padding:14px;border:1px solid var(--line);border-radius:20px;
        background:rgba(255,255,255,.98);box-shadow:var(--shadow);flex-direction:column;align-items:flex-start;gap:10px
      }
      .nav.open .nav-cta{display:flex;flex-wrap:wrap}
      .desktop-only{display:none}
      .mobile-only{display:block}
    }
    @media (max-width: 720px){
      .hero{padding-top:22px}
      .hero-panel{padding:22px}
      .hero-points,.grid-4,.grid-3,.grid-2,.form{grid-template-columns:1fr}
      .section{padding:16px 0}
      .timeline-item{grid-template-columns:1fr}
      .rating-line{align-items:flex-start}
      .kefu{grid-template-columns:1fr}
    }
    .reveal{opacity:0;transform:translateY(14px);transition:.6s ease}
    .reveal.in{opacity:1;transform:none}