:root{
      --bg:#f7f5ef;
      --surface:#ffffff;
      --surface-2:#f0f4ff;
      --ink:#1d2433;
      --muted:#5f697d;
      --line:#d8deea;
      --primary:#ff4d6d;
      --primary-2:#6c63ff;
      --accent:#00b8a9;
      --warn:#ffb020;
      --shadow:0 18px 50px rgba(22, 34, 56, .08);
      --shadow-2:0 10px 28px rgba(23, 32, 51, .12);
      --radius:22px;
      --radius-sm:16px;
      --max: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",Arial,sans-serif;
      color:var(--ink);
      background:
        radial-gradient(circle at top left, rgba(255,77,109,.12), transparent 28%),
        radial-gradient(circle at 85% 10%, rgba(108,99,255,.12), transparent 22%),
        linear-gradient(180deg, #fffdf8 0%, #f7f5ef 48%, #f6f8fc 100%);
      line-height:1.65;
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--max), calc(100% - 32px)); margin:0 auto}
    .topbar{
      position:sticky;top:0;z-index:50;
      backdrop-filter: blur(14px);
      background:rgba(255,255,255,.8);
      border-bottom:1px solid rgba(216,222,234,.75);
    }
    .nav{
      display:flex;align-items:center;justify-content:space-between;gap:16px;
      min-height:72px;padding:10px 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 20px rgba(0,0,0,.06)}
    .brand-text{min-width:0}
    .brand-text strong{display:block;font-size:1rem;letter-spacing:.5px}
    .brand-text span{display:block;font-size:.85rem;color:var(--muted)}
    .nav-links{display:flex;flex-wrap:wrap;gap:6px;align-items:center;justify-content:flex-end}
    .nav-links a{
      padding:8px 12px;border-radius:999px;color:var(--ink);font-size:.92rem;
      transition:.2s ease;background:transparent;border:1px solid transparent
    }
    .nav-links a:hover,.nav-links a:focus-visible{background:#fff;border-color:var(--line);box-shadow:0 8px 18px rgba(24,33,56,.06)}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      border:0;cursor:pointer;font-weight:700;letter-spacing:.2px;
      padding:12px 18px;border-radius:14px;transition:.22s ease;
      box-shadow:0 10px 24px rgba(255,77,109,.12);
    }
    .btn:hover{transform:translateY(-1px);box-shadow:0 16px 30px rgba(255,77,109,.18)}
    .btn-primary{background:linear-gradient(135deg,var(--primary),#ff8a5b);color:#fff}
    .btn-secondary{background:#fff;color:var(--ink);border:1px solid var(--line);box-shadow:none}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:14px;padding:11px 13px;color:var(--ink)}
    .hero{padding:34px 0 24px}
    .hero-grid{
      display:grid;grid-template-columns:1.2fr .8fr;gap:22px;align-items:stretch;
    }
    .hero-panel{
      background:linear-gradient(145deg, rgba(255,255,255,.94), rgba(255,255,255,.8));
      border:1px solid rgba(216,222,234,.9);
      border-radius:28px;
      box-shadow:var(--shadow);
      padding:30px;
      overflow:hidden;
      position:relative;
    }
    .hero-panel::before{
      content:"";position:absolute;inset:-40px auto auto -40px;width:180px;height:180px;
      background:radial-gradient(circle, rgba(255,77,109,.15), transparent 70%);
      pointer-events:none;
    }
    .kicker{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#fff7f8;color:#bf1640;border:1px solid #ffd2db;font-weight:700;font-size:.88rem}
    h1{margin:16px 0 12px;font-size:clamp(2rem,4vw,3.6rem);line-height:1.05;letter-spacing:-.03em}
    .hero p{margin:0;color:var(--muted);font-size:1.03rem;max-width:58ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .hero-metrics{
      margin-top:22px;
      display:grid;grid-template-columns:repeat(3,1fr);gap:12px
    }
    .metric{
      background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px;
      box-shadow:0 10px 22px rgba(22, 33, 55, .05)
    }
    .metric strong{display:block;font-size:1.3rem}
    .metric span{color:var(--muted);font-size:.88rem}
    .side-card{
      background:linear-gradient(180deg,#1e2338 0%, #232d4d 100%);
      color:#fff;border-radius:28px;padding:24px;border:1px solid rgba(255,255,255,.08);
      box-shadow:var(--shadow-2);position:relative;overflow:hidden
    }
    .side-card::after{
      content:"";position:absolute;right:-60px;top:-60px;width:180px;height:180px;
      background:radial-gradient(circle, rgba(0,184,169,.35), transparent 65%)
    }
    .side-card h2,.side-card p,.side-card li{position:relative;z-index:1}
    .side-card h2{margin:0 0 10px;font-size:1.2rem}
    .side-card p{margin:0 0 16px;color:rgba(255,255,255,.84)}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:8px}
    .tag-cloud span{
      background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);
      color:#fff;padding:8px 10px;border-radius:999px;font-size:.84rem
    }
    section{padding:18px 0}
    .section-head{
      display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:16px
    }
    .section-head h2{margin:0;font-size:1.7rem}
    .section-head p{margin:0;color:var(--muted);max-width:68ch}
    .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{
      background:rgba(255,255,255,.92);border:1px solid var(--line);border-radius:24px;padding:20px;
      box-shadow:0 12px 26px rgba(17,29,51,.05);transition:.22s ease
    }
    .card:hover{transform:translateY(-2px);box-shadow:0 18px 34px rgba(17,29,51,.09)}
    .card h3{margin:0 0 8px;font-size:1.06rem}
    .card p{margin:0;color:var(--muted)}
    .icon-badge{
      width:44px;height:44px;border-radius:14px;display:grid;place-items:center;margin-bottom:12px;
      background:linear-gradient(135deg, rgba(255,77,109,.15), rgba(108,99,255,.15));color:#b81c52;font-weight:800
    }
    .split{
      display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start
    }
    .panel{
      background:rgba(255,255,255,.94);border:1px solid var(--line);border-radius:26px;padding:22px;box-shadow:var(--shadow)
    }
    .list{
      margin:0;padding:0;list-style:none;display:grid;gap:12px
    }
    .list li{
      display:flex;gap:10px;align-items:flex-start;padding:12px 14px;border-radius:16px;background:#fafcff;border:1px solid #e8edf6
    }
    .dot{width:10px;height:10px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-2));margin-top:7px;flex:0 0 auto}
    .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .step{
      padding:18px;border-radius:22px;background:linear-gradient(180deg,#fff,#fbfcff);border:1px solid var(--line)
    }
    .step b{
      display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:999px;
      background:linear-gradient(135deg,var(--primary),#ff8a5b);color:#fff;margin-bottom:12px
    }
    .table-wrap{overflow:auto;border-radius:22px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:14px 16px;border-bottom:1px solid #edf1f7;text-align:left;vertical-align:top}
    th{background:#f8faff;color:#253042;font-size:.95rem}
    td{color:#425066}
    .rating{
      display:grid;grid-template-columns:1.1fr .9fr;gap:16px
    }
    .score{
      background:linear-gradient(145deg,#1d2433,#2b3a63);color:#fff;border-radius:24px;padding:24px;position:relative;overflow:hidden
    }
    .score .big{font-size:3rem;font-weight:800;line-height:1}
    .score small{color:rgba(255,255,255,.74)}
    .faq-item{
      border:1px solid var(--line);border-radius:18px;background:#fff;overflow:hidden
    }
    .faq-q{
      width:100%;padding:16px 18px;border:0;background:transparent;color:var(--ink);font-size:1rem;
      display:flex;justify-content:space-between;align-items:center;gap:10px;cursor:pointer;text-align:left
    }
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease, padding .28s ease;border-top:1px solid transparent}
    .faq-a p{margin:0;padding:0 18px 16px;color:var(--muted)}
    .faq-item.open .faq-a{max-height:220px;border-top-color:#edf1f7}
    .faq-item.open .faq-q{background:#fbfcff}
    .reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .review{
      background:linear-gradient(180deg,#fff,#fcfdff);border:1px solid var(--line);border-radius:22px;padding:18px
    }
    .review .meta{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:10px}
    .stars{color:#ffb020;letter-spacing:1px}
    .media-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .media-grid img{
      width:100%;height:auto;border-radius:22px;border:1px solid var(--line);box-shadow:var(--shadow);background:#fff
    }
    .article-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .article{
      padding:18px;border-radius:20px;border:1px solid var(--line);background:#fff;display:flex;flex-direction:column;gap:8px
    }
    .article a{color:var(--primary);font-weight:700}
    .form-grid{
      display:grid;grid-template-columns:1fr 1fr;gap:14px
    }
    .field{display:flex;flex-direction:column;gap:8px}
    label{font-weight:700;font-size:.95rem}
    input,select,textarea{
      width:100%;padding:13px 14px;border-radius:14px;border:1px solid #d8deea;background:#fff;color:var(--ink);
      font:inherit;outline:none;transition:.2s ease
    }
    input:focus,select:focus,textarea:focus{border-color:rgba(255,77,109,.55);box-shadow:0 0 0 4px rgba(255,77,109,.08)}
    textarea{min-height:120px;resize:vertical}
    .footer{
      margin-top:20px;padding:24px 0 28px;border-top:1px solid rgba(216,222,234,.8);
      background:rgba(255,255,255,.7)
    }
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:18px}
    .footer a{color:#24324a}
    .subtle{color:var(--muted)}
    .chip-row{display:flex;flex-wrap:wrap;gap:10px}
    .chip{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#394255;font-size:.88rem}
    .floating{
      position:fixed;right:16px;bottom:18px;z-index:60;display:flex;flex-direction:column;gap:10px
    }
    .floating a,.floating button{
      width:52px;height:52px;border-radius:16px;border:0;display:grid;place-items:center;
      box-shadow:0 16px 32px rgba(0,0,0,.14);cursor:pointer
    }
    .floating .k{background:linear-gradient(135deg,var(--primary),#ff8a5b);color:#fff}
    .floating .t{background:#fff;color:var(--ink);border:1px solid var(--line)}
    .mobile-only{display:none}
    .timeline{display:grid;gap:12px}
    .timeline-item{
      display:grid;grid-template-columns:140px 1fr;gap:14px;align-items:start;
      padding:14px;border-radius:18px;background:#fff;border:1px solid var(--line)
    }
    .timeline-item strong{color:#172033}
    .timeline-item span{color:var(--muted)}
    .compare-note{
      display:flex;flex-wrap:wrap;gap:10px;margin-top:12px
    }
    .compare-note span{
      padding:8px 10px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:.88rem
    }
    .hidden-sm{display:block}
    @media (max-width: 1024px){
      .hero-grid,.split,.rating,.footer-grid{grid-template-columns:1fr}
      .grid-4,.grid-3,.reviews,.steps,.media-grid{grid-template-columns:repeat(2,1fr)}
      .article-list{grid-template-columns:1fr}
      .nav-links{display:none}
      .menu-toggle{display:inline-grid;place-items:center}
      .mobile-only{display:block}
    }
    @media (max-width: 720px){
      .container{width:min(var(--max), calc(100% - 22px))}
      .hero-panel,.side-card,.card,.panel,.score{padding:18px}
      .hero-metrics,.grid-4,.grid-3,.reviews,.steps,.media-grid,.form-grid{grid-template-columns:1fr}
      .section-head{flex-direction:column;align-items:flex-start}
      .timeline-item{grid-template-columns:1fr}
      .nav{min-height:64px}
      .brand-text span{display:none}
      .btn{width:100%}
      .hero-actions{display:grid;grid-template-columns:1fr}
      .floating{right:12px;bottom:12px}
      .floating a,.floating button{width:48px;height:48px}
    }
    .reveal{opacity:0;transform:translateY(12px);transition:.6s ease}
    .reveal.visible{opacity:1;transform:none}
    .mobile-panel{
      display:none;border-top:1px solid rgba(216,222,234,.8);background:rgba(255,255,255,.94)
    }
    .mobile-panel.open{display:block}
    .mobile-panel .container{padding:12px 0 16px}
    .mobile-panel a{display:block;padding:12px 4px;border-bottom:1px solid #eef2f7;color:var(--ink)}
    .mobile-panel a:last-child{border-bottom:0}
    .inline-home{display:inline-flex;align-items:center;gap:8px}
    .headline-underline{position:relative;display:inline-block}
    .headline-underline::after{
      content:"";position:absolute;left:0;bottom:-6px;width:100%;height:10px;border-radius:999px;
      background:linear-gradient(90deg, rgba(255,77,109,.18), rgba(108,99,255,.2));z-index:-1
    }