:root{
      --bg:#f7fbff;
      --bg2:#eef6ff;
      --card:#ffffff;
      --text:#14324a;
      --muted:#5f7386;
      --line:#d9e6f3;
      --primary:#1677ff;
      --primary2:#19b6ff;
      --accent:#1fd1a5;
      --warm:#ffb84d;
      --shadow:0 14px 40px rgba(18, 55, 96, .10);
      --radius:20px;
      --radius-sm:14px;
      --max:1200px;
    }
    *{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(--text);
      background:
        radial-gradient(circle at top left, rgba(25,182,255,.12), transparent 35%),
        radial-gradient(circle at top right, rgba(31,209,165,.10), transparent 30%),
        linear-gradient(180deg, #fafdff 0%, #f5f9fe 48%, #f8fbff 100%);
    }
    a{color:var(--primary); text-decoration:none}
    img{display:block; max-width:100%}
    .container{width:min(var(--max), calc(100% - 32px)); margin:0 auto}
    .site-header{position:sticky; top:0; z-index:60; backdrop-filter:blur(12px); background:rgba(247,251,255,.84); border-bottom:1px solid rgba(217,230,243,.72)}
    .nav-bar{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; object-fit:contain; border-radius:12px; background:#fff; padding:6px; box-shadow:0 8px 24px rgba(22,119,255,.12)}
    .brand-text{min-width:0}
    .brand-text strong{display:block; font-size:18px; line-height:1.1}
    .brand-text span{display:block; color:var(--muted); font-size:12px; margin-top:4px}
    .nav-toggle{display:none; border:1px solid var(--line); background:#fff; color:var(--text); border-radius:12px; padding:10px 12px}
    .nav-links{display:flex; align-items:center; gap:18px; flex-wrap:wrap}
    .nav-links a{color:var(--text); font-size:14px; opacity:.9}
    .nav-links a:hover{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:1px solid transparent; border-radius:999px; padding:12px 18px;
      font-weight:700; transition:.25s ease; cursor:pointer; white-space:nowrap;
      box-shadow:none;
    }
    .btn-primary{background:linear-gradient(135deg, var(--primary), var(--primary2)); color:#fff; box-shadow:0 10px 24px rgba(22,119,255,.22)}
    .btn-ghost{background:#fff; color:var(--text); border-color:var(--line)}
    .btn:hover{transform:translateY(-1px); box-shadow:0 12px 28px rgba(18,55,96,.12)}
    .hero{
      padding:34px 0 20px;
    }
    .hero-grid{
      display:grid; grid-template-columns:1.15fr .85fr; gap:22px; align-items:stretch;
    }
    .hero-card{
      position:relative; overflow:hidden; border-radius:28px; background:
        linear-gradient(135deg, rgba(22,119,255,.98), rgba(25,182,255,.92) 52%, rgba(31,209,165,.92));
      color:#fff; box-shadow:var(--shadow); padding:34px;
      min-height:360px;
    }
    .hero-card::before, .hero-card::after{
      content:""; position:absolute; inset:auto; border-radius:50%; pointer-events:none;
      background:rgba(255,255,255,.14); filter:blur(2px)
    }
    .hero-card::before{width:260px; height:260px; right:-90px; top:-70px}
    .hero-card::after{width:180px; height:180px; right:30%; bottom:-90px}
    .eyebrow{display:inline-flex; align-items:center; gap:8px; font-size:13px; letter-spacing:.02em; padding:8px 12px; border-radius:999px; background:rgba(255,255,255,.14)}
    h1{margin:16px 0 14px; font-size:clamp(32px, 4.5vw, 54px); line-height:1.08; letter-spacing:-.02em}
    .hero p{margin:0; color:rgba(255,255,255,.92); font-size:16px; line-height:1.8; max-width:60ch}
    .hero-actions{display:flex; gap:12px; flex-wrap:wrap; margin-top:24px}
    .hero-stats{display:grid; grid-template-columns:repeat(3,1fr); gap:12px; margin-top:28px}
    .stat{
      background:rgba(255,255,255,.13); border:1px solid rgba(255,255,255,.18); border-radius:18px; padding:16px;
      backdrop-filter:blur(8px)
    }
    .stat strong{display:block; font-size:22px}
    .stat span{display:block; margin-top:6px; font-size:13px; color:rgba(255,255,255,.9)}
    .hero-side{
      display:grid; grid-template-rows:auto auto; gap:16px;
    }
    .side-panel{
      background:rgba(255,255,255,.86); border:1px solid rgba(217,230,243,.9); border-radius:24px; box-shadow:var(--shadow); padding:22px;
    }
    .side-panel h2,.section-title h2{margin:0 0 10px; font-size:26px; line-height:1.2}
    .side-panel p,.section-desc{margin:0; color:var(--muted); line-height:1.75}
    .badge-cloud{display:flex; flex-wrap:wrap; gap:10px; margin-top:16px}
    .chip{padding:8px 12px; background:#f3f8ff; border:1px solid var(--line); border-radius:999px; color:var(--text); font-size:13px}
    .floating-note{display:grid; grid-template-columns:1fr 1fr; gap:12px; margin-top:14px}
    .mini-card{background:#fff; border:1px solid var(--line); border-radius:18px; padding:16px}
    .mini-card strong{display:block; font-size:18px}
    .mini-card span{display:block; color:var(--muted); margin-top:6px; font-size:13px; line-height:1.6}
    .section{padding:22px 0}
    .section-title{display:flex; align-items:end; justify-content:space-between; gap:16px; margin-bottom:16px}
    .grid-4{display:grid; grid-template-columns:repeat(4,1fr); gap:16px}
    .grid-3{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
    .card{
      background:var(--card); border:1px solid var(--line); border-radius:var(--radius); box-shadow:0 10px 28px rgba(15,40,70,.06); padding:22px;
      transition:.25s ease;
    }
    .card:hover{transform:translateY(-3px); box-shadow:0 16px 34px rgba(15,40,70,.10)}
    .card h3{margin:0 0 10px; font-size:18px}
    .card p, .card li{color:var(--muted); line-height:1.75}
    .icon{
      width:44px; height:44px; border-radius:14px; display:grid; place-items:center; font-size:20px; margin-bottom:14px;
      background:linear-gradient(135deg, rgba(22,119,255,.14), rgba(31,209,165,.14)); color:var(--primary)
    }
    .steps{display:grid; grid-template-columns:repeat(5,1fr); gap:14px}
    .step{position:relative}
    .step .num{font-weight:800; color:var(--primary); margin-bottom:10px}
    .step:not(:last-child)::after{content:""; position:absolute; top:28px; right:-8px; width:16px; height:2px; background:linear-gradient(90deg, var(--primary), var(--accent))}
    .comparison{
      overflow:auto; border-radius:24px; border:1px solid var(--line); background:#fff; box-shadow:var(--shadow)
    }
    table{width:100%; border-collapse:collapse; min-width:860px}
    th,td{padding:16px 18px; border-bottom:1px solid var(--line); text-align:left; vertical-align:top}
    th{background:#f6fbff; color:var(--text); font-size:14px}
    td{color:var(--muted)}
    tr:last-child td{border-bottom:none}
    .highlight-row td{background:#f2fbff; color:var(--text); font-weight:600}
    .split{display:grid; grid-template-columns:1fr 1fr; gap:16px}
    .panel{
      background:linear-gradient(180deg, #fff 0%, #f8fcff 100%);
      border:1px solid var(--line); border-radius:24px; padding:22px; box-shadow:0 10px 28px rgba(15,40,70,.05)
    }
    .list-check{list-style:none; padding:0; margin:0; display:grid; gap:12px}
    .list-check li{display:flex; gap:10px; align-items:flex-start}
    .list-check li::before{content:"✓"; color:var(--accent); font-weight:900; margin-top:1px}
    .gallery{display:grid; grid-template-columns:repeat(2,1fr); gap:16px}
    .ai-page-image{width:100%; border-radius:20px; box-shadow:0 12px 28px rgba(15,40,70,.12); object-fit:cover}
    .articles{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
    .article a{display:block; font-weight:700; margin-bottom:8px}
    .article span{color:var(--muted); font-size:14px; line-height:1.7}
    .reviews,.faq-list{display:grid; gap:14px}
    .review-head{display:flex; align-items:center; justify-content:space-between; gap:10px; margin-bottom:10px}
    .stars{color:#ffb84d; letter-spacing:2px}
    details{
      background:#fff; border:1px solid var(--line); border-radius:18px; padding:16px 18px; box-shadow:0 8px 22px rgba(15,40,70,.05)
    }
    summary{cursor:pointer; font-weight:700; color:var(--text)}
    details p{margin:12px 0 0; color:var(--muted); line-height:1.75}
    .form-grid{display:grid; grid-template-columns:1fr 1fr; gap:14px}
    .field{display:flex; flex-direction:column; gap:8px}
    label{font-size:14px; font-weight:700}
    input, select, textarea{
      width:100%; border:1px solid var(--line); background:#fff; color:var(--text); border-radius:14px; padding:13px 14px; font:inherit; outline:none;
    }
    textarea{min-height:120px; resize:vertical}
    input:focus, select:focus, textarea:focus{border-color:rgba(22,119,255,.6); box-shadow:0 0 0 4px rgba(22,119,255,.10)}
    .form-actions{display:flex; gap:12px; flex-wrap:wrap; margin-top:14px}
    .footer{
      margin-top:18px; padding:22px 0 28px; border-top:1px solid var(--line); background:rgba(255,255,255,.72)
    }
    .footer-grid{display:grid; grid-template-columns:1.1fr .9fr .8fr; gap:18px}
    .footer a{color:var(--text)}
    .footer small,.footer p{color:var(--muted); line-height:1.7}
    .service-network{display:flex; flex-wrap:wrap; gap:10px}
    .sticky-float{
      position:fixed; right:16px; bottom:16px; display:grid; gap:10px; z-index:80;
    }
    .float-btn{
      width:52px; height:52px; border-radius:16px; display:grid; place-items:center; background:linear-gradient(135deg, var(--primary), var(--accent)); color:#fff; box-shadow:0 12px 26px rgba(22,119,255,.25)
    }
    .back-top{border:none; cursor:pointer}
    .mobile-only{display:none}
    .fade-up{animation:fadeUp .7s ease both}
    @keyframes fadeUp{from{opacity:0; transform:translateY(14px)} to{opacity:1; transform:translateY(0)}}
    @media (max-width: 1024px){
      .hero-grid,.split,.footer-grid,.grid-4,.grid-3,.steps,.articles{grid-template-columns:1fr 1fr}
      .hero-card{min-height:auto}
    }
    @media (max-width: 760px){
      .nav-toggle{display:inline-flex}
      .nav-links{display:none; width:100%; padding:12px 0 0; flex-direction:column; align-items:flex-start}
      .nav-links.show{display:flex}
      .nav-bar{flex-wrap:wrap}
      .nav-cta{width:100%; justify-content:flex-start; flex-wrap:wrap}
      .hero-grid,.split,.footer-grid,.grid-4,.grid-3,.steps,.articles,.gallery,.form-grid,.hero-stats,.floating-note{grid-template-columns:1fr}
      .hero-card{padding:24px}
      .side-panel,.card,.panel{padding:18px}
      .section-title{flex-direction:column; align-items:flex-start}
      .mobile-only{display:inline-flex}
      .step:not(:last-child)::after{display:none}
    }