:root{
      --bg:#f5f8ff;
      --bg2:#eef4ff;
      --card:#ffffff;
      --text:#13203a;
      --muted:#5f6e88;
      --line:#d7e1f3;
      --brand:#1d4ed8;
      --brand2:#0f7bff;
      --brand3:#3b82f6;
      --accent:#ffb703;
      --shadow:0 18px 50px rgba(16,42,98,.12);
      --radius:20px;
      --radius-sm:14px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);background:linear-gradient(180deg,#f8fbff 0%,#f1f6ff 38%,#f7f9fd 100%);}
    a{color:var(--brand);text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container),calc(100% - 32px));margin:0 auto}
    .site-header{position:sticky;top:0;z-index:50;background:rgba(245,248,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(215,225,243,.8)}
    .nav-wrap{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:46px;height:46px;object-fit:contain;border-radius:12px;background:#fff;padding:6px;border:1px solid var(--line)}
    .brand-text{display:flex;flex-direction:column;line-height:1.1}
    .brand-text strong{font-size:18px}
    .brand-text span{font-size:12px;color:var(--muted)}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--text);border-radius:12px;padding:10px 12px;font-size:14px}
    .nav{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .nav a{font-size:14px;color:var(--text);padding:8px 0;opacity:.86}
    .nav .home-btn{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;padding:10px 14px;border-radius:999px;box-shadow:0 10px 24px rgba(29,78,216,.22)}
    .hero{padding:42px 0 24px;position:relative;overflow:hidden}
    .hero::before,.hero::after{content:"";position:absolute;inset:auto;border-radius:50%;filter:blur(10px);pointer-events:none}
    .hero::before{width:260px;height:260px;right:-90px;top:-40px;background:radial-gradient(circle,rgba(59,130,246,.26),transparent 70%)}
    .hero::after{width:320px;height:320px;left:-120px;bottom:-140px;background:radial-gradient(circle,rgba(29,78,216,.16),transparent 70%)}
    .hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:22px;align-items:stretch}
    .hero-main,.hero-side,.panel,.card,.faq-item,.review,.article,.timeline li,.step,.value,.compare,.form-box,.quote{background:rgba(255,255,255,.88);border:1px solid rgba(215,225,243,.95);box-shadow:var(--shadow);border-radius:var(--radius)}
    .hero-main{padding:34px}
    .kicker{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#eaf2ff;color:var(--brand);font-size:13px;font-weight:700}
    h1{margin:16px 0 14px;font-size:clamp(30px,5vw,54px);line-height:1.08;letter-spacing:-.02em}
    .hero-main p{margin:0;color:var(--muted);font-size:16px;line-height:1.8;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;border:0;border-radius:999px;padding:13px 18px;font-weight:700;cursor:pointer;transition:.25s ease;line-height:1}
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 14px 28px rgba(29,78,216,.22)}
    .btn-ghost{background:#fff;color:var(--brand);border:1px solid var(--line)}
    .btn:hover,.card:hover,.review:hover,.article:hover,.step:hover,.value:hover,.compare:hover,.faq-item:hover,.timeline li:hover{transform:translateY(-3px)}
    .hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:26px}
    .stat{padding:16px;border-radius:18px;background:linear-gradient(180deg,#f7fbff,#edf4ff);border:1px solid #dce6f8}
    .stat strong{display:block;font-size:24px;color:var(--brand)}
    .stat span{font-size:13px;color:var(--muted)}
    .hero-side{padding:22px;display:grid;gap:14px;align-content:start}
    .side-top{display:flex;justify-content:space-between;gap:10px;align-items:flex-start}
    .pill{padding:7px 10px;background:#eef5ff;color:var(--brand);border-radius:999px;font-size:12px;font-weight:700}
    .mini-list{display:grid;gap:10px;margin:0;padding:0;list-style:none}
    .mini-list li{display:flex;justify-content:space-between;gap:12px;padding:10px 12px;border-radius:14px;background:#f7faff;color:var(--text);font-size:14px;border:1px solid #e4ecfb}
    .section{padding:20px 0}
    .section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:16px}
    .section-head h2{margin:0;font-size:clamp(22px,3vw,34px)}
    .section-head p{margin:0;color:var(--muted);max-width:68ch;line-height:1.7}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .card,.value,.step,.review,.article,.compare,.faq-item,.form-box,.quote,.panel{padding:20px}
    .card h3,.value h3,.step h3,.review h3,.article h3,.compare h3,.faq-item summary{margin:0 0 10px;font-size:18px}
    .card p,.value p,.step p,.review p,.article p,.compare p,.quote p,.panel p{margin:0;color:var(--muted);line-height:1.75}
    .icon{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,#e8f1ff,#dbe8ff);color:var(--brand);font-weight:800;margin-bottom:12px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:9px 12px;background:#fff;border:1px solid var(--line);border-radius:999px;color:var(--text);font-size:13px}
    .media-row{display:grid;grid-template-columns:1.08fr .92fr;gap:14px}
    .image-strip{display:grid;gap:12px}
    .ai-page-image{border-radius:18px;border:1px solid var(--line);box-shadow:0 14px 36px rgba(16,42,98,.10)}
    .steps{counter-reset:step}
    .step::before{counter-increment:step;content:"0" counter(step);display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;border-radius:14px;background:#eaf2ff;color:var(--brand);font-weight:800;margin-bottom:12px}
    .compare-table{width:100%;border-collapse:separate;border-spacing:0;overflow:hidden}
    .compare-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line);background:#fff}
    .compare-table th,.compare-table td{padding:14px 12px;text-align:left;border-bottom:1px solid #edf2fb;white-space:nowrap;font-size:14px}
    .compare-table th{background:#edf4ff;color:var(--text)}
    .compare-table tr:last-child td{border-bottom:0}
    .rating{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
    .stars{color:#ffb703;font-size:20px;letter-spacing:2px}
    details{border:none}
    .faq-item{padding:0;overflow:hidden}
    .faq-item summary{list-style:none;padding:18px 20px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:14px}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item summary span:last-child{color:var(--brand);font-size:22px}
    .faq-item .answer{padding:0 20px 18px;color:var(--muted);line-height:1.8}
    .review .meta{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:10px}
    .review .role{color:var(--brand);font-size:13px;font-weight:700}
    .timeline{list-style:none;margin:0;padding:0;display:grid;gap:12px}
    .timeline li{padding:16px 18px;position:relative}
    .timeline strong{display:block;margin-bottom:6px}
    .articles{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .article .label{display:inline-block;margin-bottom:10px;padding:6px 10px;border-radius:999px;background:#eef5ff;color:var(--brand);font-size:12px;font-weight:700}
    .form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .field{display:flex;flex-direction:column;gap:8px}
    label{font-size:14px;font-weight:700;color:var(--text)}
    input,select,textarea{width:100%;border:1px solid #d8e2f3;background:#fff;border-radius:14px;padding:13px 14px;font:inherit;color:var(--text);outline:none;transition:border-color .2s,box-shadow .2s}
    input:focus,select:focus,textarea:focus{border-color:var(--brand3);box-shadow:0 0 0 4px rgba(59,130,246,.12)}
    textarea{min-height:120px;resize:vertical}
    .full{grid-column:1/-1}
    .submit-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:14px}
    .quote{border-left:5px solid var(--brand)}
    .footer{margin-top:22px;padding:22px 0 28px;background:#eef4ff;border-top:1px solid #d8e2f3;color:var(--text)}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:18px;align-items:start}
    .footer a{color:var(--brand)}
    .footer small,.footer p{color:var(--muted)}
    .floating{position:fixed;right:18px;bottom:18px;z-index:60;display:grid;gap:10px}
    .floating a,.floating button{display:grid;place-items:center;width:48px;height:48px;border-radius:16px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow);cursor:pointer}
    .floating .top{display:none}
    .menu-panel{display:none}
    .qr-box{display:grid;gap:12px;align-items:start}
    .qr-box img{width:180px;border-radius:16px;border:1px solid var(--line)}
    .side-links{display:grid;gap:10px}
    .side-links a{padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--text)}
    @media (max-width: 980px){
      .hero-grid,.media-row,.grid-4,.grid-3,.articles,.footer-grid{grid-template-columns:1fr}
      .grid-2{grid-template-columns:1fr}
      .section-head{align-items:flex-start;flex-direction:column}
      .nav-toggle{display:inline-flex}
      .nav{display:none}
      .nav.open{display:flex;flex-direction:column;align-items:flex-start;gap:12px;padding:12px 0 16px}
      .menu-panel{display:block}
    }
    @media (max-width: 640px){
      .container{width:min(var(--container),calc(100% - 24px))}
      .hero-main,.hero-side,.card,.step,.review,.article,.compare,.faq-item,.form-box,.quote,.panel{padding:18px}
      .hero{padding-top:26px}
      .hero-stats{grid-template-columns:1fr}
      .form-grid{grid-template-columns:1fr}
      .floating .top{display:grid}
    }