:root{
      --bg:#f7f8fc;
      --bg2:#fff8ef;
      --card:#ffffff;
      --text:#172033;
      --muted:#5b6477;
      --line:#e8ebf2;
      --brand:#ff5b5f;
      --brand2:#2d7ff9;
      --accent:#ffb13b;
      --shadow:0 14px 40px rgba(31,49,89,.10);
      --radius:22px;
      --max: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;background:linear-gradient(180deg,var(--bg) 0%,#fff 46%,var(--bg2) 100%);color:var(--text)}
    img{display:block;max-width:100%}
    a{color:inherit;text-decoration:none}
    .container{width:min(var(--max),calc(100% - 32px));margin:0 auto}
    .topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:blur(12px);border-bottom:1px solid rgba(232,235,242,.8)}
    .nav{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:14px 0}
    .brand{display:flex;align-items:center;gap:12px;min-width:0}
    .brand .ai-page-logo{width:44px;height:44px;object-fit:contain;border-radius:12px;background:#fff;box-shadow:0 8px 20px rgba(0,0,0,.08)}
    .brand-text{min-width:0}
    .brand-text strong{display:block;font-size:18px;line-height:1.2}
    .brand-text span{display:block;font-size:12px;color:var(--muted);margin-top:2px}
    .nav-links{display:flex;align-items:center;gap:14px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:var(--text);padding:8px 10px;border-radius:999px}
    .nav-links a:hover{background:#f2f5ff;color:var(--brand2)}
    .nav-cta{display:flex;align-items:center;gap:10px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:999px;padding:12px 18px;font-weight:700;cursor:pointer;transition:.25s ease;white-space:nowrap}
    .btn-primary{background:linear-gradient(135deg,var(--brand) 0%,#ff7a45 100%);color:#fff;box-shadow:0 12px 26px rgba(255,91,95,.28)}
    .btn-secondary{background:#fff;color:var(--brand2);border:1px solid #cfe0ff}
    .btn:hover{transform:translateY(-2px)}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);padding:10px 12px;border-radius:12px}
    .hero{padding:34px 0 20px}
    .hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:22px;align-items:stretch}
    .hero-copy{position:relative;background:linear-gradient(135deg,#fff 0%,#fff6f1 100%);border:1px solid #ffe1d1;border-radius:28px;padding:34px;box-shadow:var(--shadow);overflow:hidden}
    .hero-copy:before,.hero-copy:after{content:"";position:absolute;border-radius:999px;filter:blur(10px);opacity:.35}
    .hero-copy:before{width:180px;height:180px;background:#ff6d72;right:-40px;top:-40px}
    .hero-copy:after{width:140px;height:140px;background:#5fa8ff;left:-30px;bottom:-30px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid #ffd7d9;color:#d44549;padding:8px 12px;border-radius:999px;font-size:13px;font-weight:700}
    h1{margin:16px 0 14px;font-size:clamp(30px,5vw,54px);line-height:1.08;letter-spacing:-.03em}
    .hero p{margin:0;color:var(--muted);font-size:16px;line-height:1.8;max-width:54ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .hero-points{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px}
    .point{background:#fff;border:1px solid #eef1f6;border-radius:18px;padding:14px 14px 12px}
    .point b{display:block;font-size:18px}
    .point span{display:block;font-size:13px;color:var(--muted);margin-top:6px;line-height:1.5}
    .hero-side{display:grid;gap:14px}
    .metric-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .metric{background:linear-gradient(180deg,#ffffff 0%,#fffdfb 100%);border:1px solid var(--line);border-radius:22px;padding:20px;box-shadow:var(--shadow)}
    .metric strong{display:block;font-size:28px;line-height:1}
    .metric span{display:block;color:var(--muted);margin-top:8px;font-size:13px;line-height:1.6}
    .hero-panel{background:linear-gradient(160deg,#18233d 0%,#243b78 100%);color:#fff;border-radius:28px;padding:22px;box-shadow:var(--shadow)}
    .hero-panel h2{margin:0 0 10px;font-size:20px}
    .hero-panel p,.hero-panel li{color:rgba(255,255,255,.88);font-size:14px;line-height:1.7}
    .hero-panel ul{margin:12px 0 0;padding-left:18px}
    section{padding:22px 0}
    .section-title{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:16px}
    .section-title h2{margin:0;font-size:28px;line-height:1.15}
    .section-title p{margin:0;color:var(--muted);max-width:60ch}
    .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:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:0 10px 30px rgba(31,49,89,.06);transition:.25s ease}
    .card:hover{transform:translateY(-4px);box-shadow:0 18px 42px rgba(31,49,89,.10)}
    .card h3{margin:0 0 10px;font-size:18px}
    .card p,.card li{color:var(--muted);line-height:1.75}
    .tagcloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:9px 13px;background:#fff;border:1px solid #e9edf6;border-radius:999px;color:#334;box-shadow:0 8px 18px rgba(0,0,0,.03)}
    .accent-band{background:linear-gradient(135deg,#fff 0%,#fff6ef 100%);border:1px solid #ffe1ca;border-radius:28px;padding:22px}
    .steps{counter-reset:step;display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .step{position:relative}
    .step h3:before{counter-increment:step;content:"0" counter(step);display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:11px;background:linear-gradient(135deg,var(--brand2),#66b2ff);color:#fff;font-size:13px;margin-right:10px}
    .compare-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:820px}
    th,td{padding:16px 14px;border-bottom:1px solid #edf1f6;text-align:left;vertical-align:top}
    th{background:#f7faff;color:#223;font-size:14px}
    td{color:var(--muted)}
    .rating{display:grid;grid-template-columns:1.1fr .9fr;gap:16px;align-items:stretch}
    .rating-box{border-radius:24px;padding:22px;background:linear-gradient(135deg,#10192f 0%,#24385e 100%);color:#fff}
    .rating-box h3{margin:0 0 10px}
    .stars{font-size:24px;letter-spacing:2px;color:#ffd86b}
    .score{font-size:54px;line-height:1;margin:10px 0 6px;font-weight:800}
    .faq{display:grid;gap:12px}
    details{background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:0 8px 20px rgba(31,49,89,.05)}
    summary{list-style:none;padding:18px 20px;font-weight:700;cursor:pointer;display:flex;justify-content:space-between;gap:14px}
    summary::-webkit-details-marker{display:none}
    details .answer{padding:0 20px 18px;color:var(--muted);line-height:1.8}
    .reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .review .meta{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:14px;color:var(--muted);font-size:13px}
    .article-list{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .article-item a{color:var(--brand2);font-weight:700}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .form{background:#fff;border:1px solid var(--line);border-radius:28px;padding:22px;box-shadow:var(--shadow)}
    label{display:block;font-size:14px;font-weight:700;margin-bottom:8px}
    input,select,textarea{width:100%;border:1px solid #dfe5ef;background:#fbfcfe;color:var(--text);border-radius:14px;padding:13px 14px;font:inherit;outline:none}
    textarea{min-height:124px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#8fb9ff;box-shadow:0 0 0 4px rgba(45,127,249,.12)}
    .footer{padding:26px 0 34px}
    .footer-inner{background:#10192f;color:#e7ecff;border-radius:28px;padding:24px}
    .footer-inner a{color:#fff}
    .footer-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:20px;align-items:start}
    .footer .muted{color:rgba(231,236,255,.78);line-height:1.8}
    .contact-list{display:grid;gap:10px}
    .contact-item{display:flex;gap:10px;align-items:flex-start;color:#fff}
    .floating{position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px}
    .float-btn{background:#fff;border:1px solid var(--line);border-radius:999px;padding:12px 16px;box-shadow:var(--shadow);font-weight:700;color:var(--text)}
    .float-btn.primary{background:linear-gradient(135deg,var(--brand),#ff7a45);color:#fff}
    .center{text-align:center}
    .hero-imgs{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
    .mini-box{background:linear-gradient(135deg,#fff 0%,#f4f7ff 100%);border:1px solid #e6ecfb;border-radius:20px;padding:18px}
    .list-clean{margin:0;padding-left:18px}
    .list-clean li{margin:8px 0}
    .mobile-only{display:none}
    @media (max-width: 980px){
      .hero-grid,.rating,.footer-grid,.form-grid,.grid-4,.grid-3,.reviews,.article-list,.hero-points,.steps{grid-template-columns:1fr 1fr}
      .hero{padding-top:22px}
      .nav-links{display:none}
      .menu-btn{display:inline-flex}
      .nav.open .nav-links{display:flex;position:absolute;left:16px;right:16px;top:68px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;flex-direction:column;align-items:flex-start;box-shadow:var(--shadow)}
      .nav.open .nav-cta{display:flex}
      .hero-copy{padding:26px}
    }
    @media (max-width: 640px){
      .container{width:min(var(--max),calc(100% - 20px))}
      .hero-grid,.rating,.footer-grid,.form-grid,.grid-4,.grid-3,.reviews,.article-list,.hero-points,.steps,.metric-grid{grid-template-columns:1fr}
      .section-title{flex-direction:column;align-items:flex-start}
      .hero-copy{padding:22px;border-radius:24px}
      .hero-panel{border-radius:24px}
      h1{font-size:30px}
      .mobile-only{display:inline-flex}
      .nav{position:relative}
      .nav-cta .btn-secondary{display:none}
      table{min-width:920px}
    }
    .reveal{opacity:0;transform:translateY(16px);transition:.6s ease}
    .reveal.show{opacity:1;transform:translateY(0)}
    .badge{display:inline-flex;align-items:center;gap:6px;background:#fff2f2;color:#c93136;border:1px solid #ffd7d9;padding:7px 10px;border-radius:999px;font-size:12px;font-weight:700}