:root{
      --bg:#f6f7fb;
      --panel:#ffffff;
      --panel-2:#f3f6ff;
      --line:#dde4f2;
      --text:#172033;
      --muted:#5f6b84;
      --primary:#0f62fe;
      --primary-2:#00c2ff;
      --accent:#ff4d7d;
      --gold:#ffb703;
      --shadow:0 18px 45px rgba(20,42,90,.10);
      --radius:22px;
      --radius-sm:16px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:
      radial-gradient(circle at top left, rgba(15,98,254,.12), transparent 28%),
      radial-gradient(circle at 85% 10%, rgba(255,77,125,.10), transparent 24%),
      linear-gradient(180deg,#f8faff 0%, #f5f7fb 100%);
      color:var(--text); line-height:1.65}
    a{color:inherit;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:30;background:rgba(246,247,251,.82);backdrop-filter:blur(14px);border-bottom:1px solid rgba(221,228,242,.8)}
    .nav{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:42px;height:42px;border-radius:12px;object-fit:cover;background:#fff;box-shadow:0 8px 22px rgba(15,98,254,.12)}
    .brand-title{display:flex;flex-direction:column;min-width:0}
    .brand-title strong{font-size:18px;line-height:1.15}
    .brand-title span{font-size:12px;color:var(--muted)}
    .nav-links{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:flex-end}
    .nav-links a{padding:8px 12px;border-radius:999px;color:var(--text);font-size:14px}
    .nav-links a:hover{background:rgba(15,98,254,.08);color:var(--primary)}
    .nav-cta{display:flex;gap:10px;align-items:center}
    .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;box-shadow:none}
    .btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;box-shadow:0 12px 24px rgba(15,98,254,.22)}
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 30px rgba(15,98,254,.28)}
    .btn-ghost{background:#fff;color:var(--text);border:1px solid var(--line)}
    .btn-ghost:hover{border-color:rgba(15,98,254,.35);transform:translateY(-1px)}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px}
    main{padding:18px 0 0}
    section{padding:36px 0}
    .hero{padding:26px 0 44px}
    .hero-card{position:relative;overflow:hidden;border-radius:30px;background:
      linear-gradient(135deg, rgba(15,98,254,.95), rgba(0,194,255,.84) 52%, rgba(255,77,125,.92));
      color:#fff; box-shadow:0 26px 60px rgba(15,98,254,.18)}
    .hero-card::before,.hero-card::after{content:"";position:absolute;border-radius:50%;background:rgba(255,255,255,.12);filter:blur(1px)}
    .hero-card::before{width:280px;height:280px;right:-90px;top:-70px}
    .hero-card::after{width:180px;height:180px;left:-50px;bottom:-60px}
    .hero-inner{position:relative;z-index:1;padding:42px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:28px;align-items:center}
    h1{margin:0 0 14px;font-size:clamp(30px,5vw,54px);line-height:1.08;letter-spacing:-.03em}
    .hero p{margin:0;color:rgba(255,255,255,.88);font-size:16px}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
    .pill{padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.20);font-size:13px}
    .hero-panel{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);backdrop-filter:blur(10px);border-radius:24px;padding:20px}
    .hero-stat{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .stat{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.16);border-radius:18px;padding:16px}
    .stat strong{display:block;font-size:24px;line-height:1}
    .stat span{display:block;margin-top:8px;font-size:13px;color:rgba(255,255,255,.86)}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:18px}
    .section-head h2{margin:0;font-size:clamp(24px,3vw,36px);line-height:1.15}
    .section-head p{margin:0;color:var(--muted);max-width:720px}
    .grid-4,.grid-3,.grid-2{display:grid;gap:16px}
    .grid-4{grid-template-columns:repeat(4,1fr)}
    .grid-3{grid-template-columns:repeat(3,1fr)}
    .grid-2{grid-template-columns:repeat(2,1fr)}
    .card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;transition:transform .25s ease, box-shadow .25s ease, border-color .25s ease}
    .card:hover{transform:translateY(-4px);border-color:rgba(15,98,254,.22);box-shadow:0 24px 60px rgba(20,42,90,.14)}
    .metric{display:flex;flex-direction:column;gap:10px}
    .metric .num{font-size:30px;font-weight:800;color:var(--primary)}
    .metric .label{font-weight:700}
    .metric .desc,.muted{color:var(--muted)}
    .service-card h3,.feature-card h3,.case-card h3,.review-card h3,.info-card h3{margin:0 0 8px;font-size:18px}
    .badge{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border-radius:999px;background:rgba(15,98,254,.08);color:var(--primary);font-size:12px;font-weight:700}
    .feature-list{margin:14px 0 0;padding:0;list-style:none;display:grid;gap:10px}
    .feature-list li{padding-left:18px;position:relative;color:var(--muted)}
    .feature-list li::before{content:"";position:absolute;left:0;top:.75em;width:8px;height:8px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent))}
    .step{position:relative}
    .step .index{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;font-weight:800;margin-bottom:12px}
    .compare-wrap{overflow:auto;border-radius:24px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:840px}
    th,td{padding:16px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f7f9ff;color:var(--text);font-weight:800}
    tbody tr:hover{background:#fcfdff}
    .rating{display:grid;gap:12px}
    .rating-box{padding:18px;border-radius:18px;background:linear-gradient(135deg,rgba(15,98,254,.08),rgba(255,77,125,.08));border:1px solid rgba(15,98,254,.14)}
    .stars{color:#ff9f1c;font-size:20px;letter-spacing:2px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--text);font-size:13px}
    .case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .case-card .images{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:14px}
    .case-card .images img{width:100%;aspect-ratio:1/1;object-fit:cover;border-radius:14px;border:1px solid var(--line)}
    .article-list{display:grid;gap:12px}
    .article-item{display:flex;justify-content:space-between;gap:16px;padding:16px 18px;border-radius:18px;border:1px solid var(--line);background:#fff}
    .article-item:hover{border-color:rgba(15,98,254,.22);box-shadow:0 14px 30px rgba(20,42,90,.08)}
    .article-item a{color:var(--primary);font-weight:700}
    .form-card form{display:grid;gap:14px}
    .field-row{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    label{display:grid;gap:8px;font-weight:700;font-size:14px}
    input,select,textarea{width:100%;border:1px solid var(--line);border-radius:14px;padding:13px 14px;font:inherit;color:var(--text);background:#fff;outline:none;transition:border-color .2s ease, box-shadow .2s ease}
    input:focus,select:focus,textarea:focus{border-color:rgba(15,98,254,.45);box-shadow:0 0 0 4px rgba(15,98,254,.09)}
    textarea{min-height:120px;resize:vertical}
    .faq details{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px 18px;box-shadow:var(--shadow)}
    .faq details + details{margin-top:12px}
    .faq summary{cursor:pointer;font-weight:800;list-style:none}
    .faq summary::-webkit-details-marker{display:none}
    .faq p{margin:10px 0 0;color:var(--muted)}
    .timeline{display:grid;gap:14px}
    .timeline-item{display:grid;grid-template-columns:90px 1fr;gap:14px;align-items:start;padding:16px 18px;background:#fff;border:1px solid var(--line);border-radius:18px}
    .timeline-item strong{color:var(--primary)}
    .float-box{position:fixed;right:18px;bottom:18px;z-index:40;display:grid;gap:10px}
    .float-btn{padding:12px 14px;border-radius:16px;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;box-shadow:0 16px 30px rgba(15,98,254,.25);font-weight:800}
    .backtop{position:fixed;right:18px;bottom:78px;z-index:40;opacity:0;pointer-events:none;transition:.25s ease}
    .backtop.show{opacity:1;pointer-events:auto}
    .backtop button{border:0;border-radius:16px;padding:12px 14px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);font-weight:800;color:var(--text)}
    .footer{padding:26px 0 34px;border-top:1px solid var(--line);background:#f5f7fb;color:var(--text)}
    .footer a{color:var(--primary)}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:18px;align-items:start}
    .footer small{color:var(--muted)}
    .mini-links{display:flex;flex-wrap:wrap;gap:10px}
    .mini-links a{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line)}
    .scroll-reveal{opacity:0;transform:translateY(18px);transition:.6s ease}
    .scroll-reveal.show{opacity:1;transform:none}
    .mobile-only{display:none}
    @media (max-width: 1024px){
      .grid-4,.grid-3,.case-grid,.hero-grid,.footer-grid{grid-template-columns:1fr}
      .grid-2{grid-template-columns:1fr}
      .hero-inner{padding:28px}
    }
    @media (max-width: 768px){
      .nav{flex-wrap:wrap}
      .menu-toggle{display:inline-flex}
      .nav-links{display:none;width:100%;justify-content:flex-start;padding-top:6px}
      .nav-links.open{display:flex}
      .nav-cta{margin-left:auto}
      .field-row{grid-template-columns:1fr}
      .section-head{flex-direction:column;align-items:flex-start}
      .timeline-item{grid-template-columns:1fr}
      .hero-panel{padding:16px}
      .hero-stat{grid-template-columns:1fr 1fr}
      .mobile-only{display:block}
      .desktop-only{display:none}
    }