:root{
      --bg:#f7f8fc;
      --panel:#ffffff;
      --panel-2:#f2f5ff;
      --text:#132033;
      --muted:#5e6b84;
      --line:#e4e8f2;
      --primary:#6c4cff;
      --primary-2:#ff4d8d;
      --accent:#14b8a6;
      --shadow:0 18px 45px rgba(25,37,64,.08);
      --radius:20px;
      --radius-sm:14px;
      --max:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(108,76,255,.10), transparent 30%),
        radial-gradient(circle at top right, rgba(255,77,141,.08), transparent 25%),
        linear-gradient(180deg, #ffffff 0%, #f7f8fc 24%, #f7f8fc 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%;height:auto}
    .container{width:min(var(--max), calc(100% - 32px)); margin:0 auto}
    .site-header{
      position:sticky;top:0;z-index:50;
      background:rgba(255,255,255,.82);
      backdrop-filter:blur(14px);
      border-bottom:1px solid rgba(228,232,242,.8);
    }
    .nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}
    .brand{display:flex;align-items:center;gap:12px;min-width:0}
    .brand .ai-page-logo{width:44px;height:44px;border-radius:12px;object-fit:cover;background:#fff;box-shadow:0 8px 20px rgba(0,0,0,.08)}
    .brand-txt{min-width:0}
    .brand-txt strong{display:block;font-size:18px;line-height:1.1}
    .brand-txt span{display:block;font-size:12px;color:var(--muted);margin-top:3px}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--text);border-radius:12px;padding:10px 12px;font-weight:700}
    .nav-links{display:flex;align-items:center;gap:14px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:#24324b;padding:8px 10px;border-radius:999px;transition:.25s ease}
    .nav-links a:hover,.nav-links a:focus{background:#eef2ff;color:#273b8f}
    .home-link{
      background:linear-gradient(135deg,var(--primary),var(--primary-2));
      color:#fff !important;
      padding:10px 14px !important;
      box-shadow:0 12px 24px rgba(108,76,255,.22);
    }
    .hero{
      padding:34px 0 18px;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.2fr .8fr;gap:22px;align-items:stretch;
    }
    .hero-main,.hero-side,.card,.section-box,.faq-item,.review-card,.article-card,.price-box,.form-box,.timeline-item,.compare-box{
      background:var(--panel);
      border:1px solid var(--line);
      border-radius:var(--radius);
      box-shadow:var(--shadow);
    }
    .hero-main{padding:30px;position:relative;overflow:hidden}
    .hero-main:before,.hero-main:after{
      content:"";position:absolute;border-radius:999px;pointer-events:none;
      background:radial-gradient(circle, rgba(255,77,141,.18), transparent 62%);
    }
    .hero-main:before{width:240px;height:240px;right:-80px;top:-60px}
    .hero-main:after{width:180px;height:180px;left:-60px;bottom:-70px;background:radial-gradient(circle, rgba(108,76,255,.16), transparent 62%)}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;background:#f1edff;color:#5a38eb;font-size:13px;font-weight:700}
    h1{font-size:clamp(30px,5vw,52px);line-height:1.08;margin:16px 0 14px;letter-spacing:-.03em}
    .hero p{margin:0;color:var(--muted);font-size:16px;line-height:1.8;max-width:58ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:14px;padding:13px 18px;font-weight:700;cursor:pointer;transition:.25s ease}
    .btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;box-shadow:0 14px 30px rgba(108,76,255,.24)}
    .btn-secondary{background:#fff;color:var(--text);border:1px solid var(--line)}
    .btn:hover,.btn:focus{transform:translateY(-2px)}
    .hero-points{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px}
    .hero-point{padding:14px;border-radius:16px;background:linear-gradient(180deg,#fbfbff,#f4f7ff);border:1px solid #e7ebfb}
    .hero-point strong{display:block;font-size:20px}
    .hero-point span{display:block;color:var(--muted);font-size:13px;margin-top:6px;line-height:1.5}
    .hero-side{padding:20px;display:grid;gap:14px}
    .hero-side .mini{
      padding:16px;border-radius:18px;background:linear-gradient(135deg,#17203a,#2b3473);color:#fff;
    }
    .mini h3{margin:0 0 8px;font-size:17px}
    .mini p{margin:0;color:rgba(255,255,255,.82);font-size:14px;line-height:1.7}
    .stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:18px 0 18px}
    .stat{padding:18px}
    .stat strong{display:block;font-size:28px;line-height:1}
    .stat span{display:block;margin-top:8px;color:var(--muted);font-size:13px;line-height:1.5}
    .section{padding:18px 0}
    .section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:14px}
    .section-head h2{margin:0;font-size:28px}
    .section-head p{margin:0;color:var(--muted);max-width:62ch;line-height:1.7}
    .section-box{padding:24px}
    .two-col{display:grid;grid-template-columns:1fr 1fr;gap:18px}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .card{padding:20px;transition:.25s ease}
    .card:hover,.review-card:hover,.article-card:hover,.faq-item:hover,.timeline-item:hover{transform:translateY(-3px)}
    .card h3,.article-card h3,.review-card h3{margin:0 0 10px;font-size:18px}
    .card p,.article-card p,.review-card p{margin:0;color:var(--muted);line-height:1.75}
    .pill-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
    .pill{padding:8px 12px;border-radius:999px;background:#f4f7ff;border:1px solid #e1e7fb;font-size:13px;color:#31405c}
    .workflow{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .step{padding:18px;position:relative}
    .step .num{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:800;margin-bottom:12px}
    .table-wrap{overflow-x:auto}
    table{width:100%;border-collapse:separate;border-spacing:0;min-width:840px}
    th,td{padding:14px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;font-size:14px;line-height:1.6}
    th{background:#f5f7ff;font-size:13px;color:#30405d}
    tr:first-child th:first-child{border-top-left-radius:12px}
    tr:first-child th:last-child{border-top-right-radius:12px}
    .rating{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
    .stars{color:#ffb400;font-size:18px;letter-spacing:2px}
    .compare-badge{display:inline-flex;padding:8px 12px;border-radius:999px;background:#f0fff9;color:#0d766c;border:1px solid #c9f4ea;font-weight:700}
    .timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .timeline-item{padding:18px}
    .timeline-item strong{display:block;margin-bottom:8px}
    .form-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:18px}
    .form-box{padding:24px}
    form{display:grid;gap:14px}
    .field-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    label{display:block;font-size:13px;font-weight:700;margin-bottom:8px;color:#2a3550}
    input,select,textarea{
      width:100%;border:1px solid var(--line);border-radius:14px;
      background:#fff;color:var(--text);padding:13px 14px;font:inherit;outline:none;transition:.2s ease;
    }
    textarea{min-height:118px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#9bb0ff;box-shadow:0 0 0 4px rgba(108,76,255,.10)}
    .side-panel{display:grid;gap:14px}
    .contact-card,.kefu-card,.price-box{padding:18px}
    .contact-list{display:grid;gap:10px;margin:0;padding:0;list-style:none}
    .contact-list li{display:flex;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px dashed #e7ebf5;font-size:14px}
    .contact-list li:last-child{border-bottom:none}
    .faq-list{display:grid;gap:12px}
    .faq-item{overflow:hidden}
    .faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:12px;padding:18px 20px;background:#fff;border:none;color:var(--text);font:inherit;font-weight:700;text-align:left;cursor:pointer}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease;background:#fbfcff}
    .faq-a > div{padding:0 20px 18px;color:var(--muted);line-height:1.8}
    .faq-item.active .faq-a{max-height:220px}
    .reviews,.articles,.links-cloud{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .review-card,.article-card{padding:20px}
    .review-top{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:10px}
    .avatar{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,#eef2ff,#ffeaf2);display:inline-flex;align-items:center;justify-content:center;font-weight:800;color:#4e4b8f}
    .meta{font-size:13px;color:var(--muted)}
    .link-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .link-cloud a{padding:10px 12px;border-radius:999px;border:1px solid #dfe5f4;background:#fff;color:#34405e}
    .footer{
      margin-top:24px;padding:24px 0 28px;background:#111a30;color:#eaf0ff;border-top:1px solid rgba(255,255,255,.08)
    }
    .footer a{color:#dfe7ff}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:18px}
    .footer small,.footer p{color:#c5d0ea;line-height:1.8}
    .floating{
      position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px
    }
    .float-btn{
      display:flex;align-items:center;justify-content:center;min-width:48px;height:48px;padding:0 14px;
      border-radius:999px;background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;
      box-shadow:0 14px 26px rgba(108,76,255,.24);font-weight:700
    }
    .top-btn{background:#fff;color:var(--text);border:1px solid var(--line)}
    .muted{color:var(--muted)}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .tagline{font-size:14px;color:#33415e;line-height:1.7}
    .image-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .image-box{border-radius:18px;overflow:hidden;border:1px solid var(--line);background:#fff}
    .image-box img{width:100%;height:auto;display:block}
    .section-anchor{scroll-margin-top:92px}
    .tiny{font-size:12px;color:var(--muted)}
    @media (max-width: 980px){
      .hero-grid,.form-grid,.footer-grid,.two-col,.grid-3,.reviews,.articles,.timeline,.workflow,.stat-grid,.links-cloud,.image-row{grid-template-columns:1fr}
      .hero-points{grid-template-columns:1fr}
      .nav-toggle{display:inline-flex}
      .nav-links{display:none;width:100%;padding:10px 0 4px}
      .nav-links.open{display:flex}
      .nav-wrap{flex-wrap:wrap}
      .nav-links a{width:calc(50% - 7px);justify-content:center;text-align:center;background:#fff;border:1px solid #edf1f7}
      .field-grid{grid-template-columns:1fr}
      .section-head{align-items:flex-start;flex-direction:column}
    }
    @media (max-width: 640px){
      .container{width:min(var(--max), calc(100% - 22px))}
      .hero-main,.section-box,.card,.review-card,.article-card,.faq-q,.price-box,.timeline-item,.contact-card,.form-box,.kefu-card{padding:18px}
      h1{font-size:30px}
      .section-head h2{font-size:24px}
      .nav-links a{width:100%}
      .hero-actions .btn{width:100%}
      .floating{right:12px;bottom:12px}
    }
    .reveal{opacity:0;transform:translateY(16px);transition:opacity .6s ease, transform .6s ease}
    .reveal.in{opacity:1;transform:none}