:root{
      --bg:#f5f7fb;
      --bg2:#eef3ff;
      --card:#ffffff;
      --text:#18304a;
      --muted:#5e6f84;
      --line:#dbe3ef;
      --brand:#2f6bff;
      --brand2:#7a5cff;
      --accent:#ff8c66;
      --accent2:#31c48d;
      --shadow:0 14px 40px rgba(24,48,74,.08);
      --radius:22px;
      --radius-sm:16px;
      --max:1200px;
    }
    *{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;
      color:var(--text);
      background:
        radial-gradient(1200px 500px at 10% 0%, rgba(47,107,255,.10), transparent 58%),
        radial-gradient(900px 460px at 90% 10%, rgba(122,92,255,.10), transparent 54%),
        linear-gradient(180deg, #fbfcff 0%, var(--bg) 52%, #f8fafc 100%);
    }
    a{color:inherit;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:50;
      backdrop-filter:saturate(160%) blur(16px);
      background:rgba(245,247,251,.78);
      border-bottom:1px solid rgba(219,227,239,.75);
    }
    .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 img{width:42px; height:42px; object-fit:contain; border-radius:12px; background:#fff; box-shadow:0 8px 18px rgba(24,48,74,.08)}
    .brand-text{display:flex; flex-direction:column; min-width:0}
    .brand-text strong{font-size:1.02rem; letter-spacing:.4px}
    .brand-text span{font-size:.82rem; color:var(--muted); white-space:nowrap; overflow:hidden; text-overflow:ellipsis}
    .nav-toggle{display:none; border:1px solid var(--line); background:#fff; color:var(--text); border-radius:14px; padding:10px 12px}
    .nav-links{display:flex; align-items:center; gap:14px; flex-wrap:wrap; justify-content:flex-end}
    .nav-links a{font-size:.92rem; color:#27415e; padding:8px 10px; border-radius:999px}
    .nav-links a:hover{background:#edf3ff; color:var(--brand)}
    .container-inner{padding:28px 0 8px}
    .hero{
      position:relative;
      overflow:hidden;
      padding:28px 0 10px;
    }
    .hero-grid{
      display:grid; grid-template-columns:1.15fr .85fr; gap:22px; align-items:stretch;
    }
    .hero-copy,.hero-panel,.section-card,.info-card,.review-card,.faq-item,.article-card,.case-card,.timeline-card,.pricing-card,.compare-card,.form-card,.network-card,.help-card{
      background:linear-gradient(180deg, rgba(255,255,255,.98), rgba(255,255,255,.92));
      border:1px solid rgba(219,227,239,.95);
      border-radius:var(--radius);
      box-shadow:var(--shadow);
    }
    .hero-copy{padding:30px}
    .eyebrow{
      display:inline-flex; align-items:center; gap:8px;
      padding:8px 12px; border-radius:999px;
      background:linear-gradient(90deg, rgba(47,107,255,.12), rgba(122,92,255,.12));
      color:#315ebd; font-weight:700; font-size:.84rem;
    }
    h1{margin:16px 0 14px; font-size:clamp(2rem, 4vw, 3.45rem); line-height:1.08; letter-spacing:-.03em}
    .lead{margin:0; color:var(--muted); line-height:1.9; font-size:1.02rem; max-width:62ch}
    .hero-actions{display:flex; flex-wrap:wrap; gap:12px; margin-top:22px}
    .btn{
      display:inline-flex; align-items:center; justify-content:center; gap:8px;
      min-height:46px; padding:0 18px; border-radius:14px; font-weight:700;
      border:1px solid transparent; transition:.25s ease;
    }
    .btn-primary{background:linear-gradient(135deg, var(--brand), var(--brand2)); color:#fff; box-shadow:0 12px 24px rgba(47,107,255,.22)}
    .btn-primary:hover{transform:translateY(-2px); box-shadow:0 16px 28px rgba(47,107,255,.28)}
    .btn-ghost{background:#fff; color:var(--text); border-color:var(--line)}
    .btn-ghost:hover{border-color:#c8d6ef; transform:translateY(-1px)}
    .hero-stats{
      display:grid; grid-template-columns:repeat(2, minmax(0,1fr)); gap:14px; margin-top:24px
    }
    .stat{padding:16px; border-radius:18px; background:linear-gradient(180deg, #f8fbff, #fff); border:1px solid #e4ebf7}
    .stat strong{display:block; font-size:1.25rem; margin-bottom:6px}
    .stat span{color:var(--muted); font-size:.92rem; line-height:1.6}
    .hero-panel{padding:22px; display:grid; gap:14px}
    .panel-top{display:flex; justify-content:space-between; align-items:flex-start; gap:12px}
    .panel-top h2{margin:0; font-size:1.1rem}
    .panel-top p{margin:6px 0 0; color:var(--muted); font-size:.92rem; line-height:1.7}
    .mini-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:12px}
    .mini{
      padding:16px; border-radius:18px; background:linear-gradient(180deg, #fff, #f7f9fe);
      border:1px solid #e3eaf6;
    }
    .mini b{display:block; margin-bottom:6px}
    .mini small{color:var(--muted); line-height:1.65; display:block}
    .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:1.55rem}
    .section-head p{margin:0; color:var(--muted); line-height:1.7; max-width:68ch}
    .grid-3{display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:16px}
    .grid-4{display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:16px}
    .section-card{padding:22px}
    .icon-badge{
      width:48px; height:48px; border-radius:16px; display:grid; place-items:center;
      background:linear-gradient(135deg, rgba(47,107,255,.12), rgba(49,196,141,.12));
      color:var(--brand); font-weight:900; margin-bottom:14px
    }
    .section-card h3,.article-card h3,.case-card h3,.faq-item h3,.review-card h3,.compare-card h3,.pricing-card h3,.timeline-card h3,.help-card h3,.network-card h3,.form-card h3{margin:0 0 10px; font-size:1.08rem}
    .section-card p,.article-card p,.case-card p,.review-card p,.network-card p,.help-card p,.pricing-card p{margin:0; color:var(--muted); line-height:1.8}
    .tags{display:flex; flex-wrap:wrap; gap:10px; margin-top:14px}
    .tag{padding:8px 12px; border-radius:999px; background:#f3f7ff; color:#3152a6; border:1px solid #dbe6ff; font-size:.88rem}
    .table-wrap{overflow-x:auto; border-radius:18px; border:1px solid var(--line); background:#fff}
    table{width:100%; border-collapse:collapse; min-width:760px}
    th,td{padding:14px 16px; border-bottom:1px solid #edf2f8; text-align:left; vertical-align:top}
    th{background:#f7faff; color:#28425f; font-size:.95rem}
    td{color:#38516d; line-height:1.7}
    .strong{font-weight:800; color:#1d3f77}
    .rating{display:flex; align-items:center; gap:10px; margin-top:10px; color:#304a69}
    .stars{color:#ffb74d; letter-spacing:2px; font-size:1.1rem}
    .timeline{display:grid; gap:12px}
    .step{
      display:grid; grid-template-columns:auto 1fr; gap:14px; align-items:start;
      padding:16px; border-radius:18px; background:linear-gradient(180deg,#fff,#f8fbff); border:1px solid #e4ebf7
    }
    .step-num{width:34px;height:34px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-weight:800}
    .case-card,.article-card,.review-card,.faq-item,.pricing-card,.timeline-card,.help-card,.network-card,.compare-card,.form-card{padding:20px}
    .case-meta,.article-meta{display:flex; gap:8px; flex-wrap:wrap; margin-top:12px}
    .pill{font-size:.82rem; padding:6px 10px; border-radius:999px; background:#eef4ff; color:#315ebd}
    .faq-list{display:grid; gap:12px}
    .faq-item button{
      width:100%; text-align:left; border:0; background:transparent; padding:0; color:inherit; font:inherit; cursor:pointer;
      display:flex; justify-content:space-between; align-items:center; gap:16px
    }
    .faq-item .answer{display:none; margin-top:12px; color:var(--muted); line-height:1.85}
    .faq-item.open .answer{display:block}
    .faq-item .chev{transition:.25s ease; flex:0 0 auto}
    .faq-item.open .chev{transform:rotate(180deg)}
    .reviews{display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:16px}
    .review-top{display:flex; justify-content:space-between; align-items:center; gap:10px; margin-bottom:12px}
    .review-top strong{font-size:1rem}
    .review-top span{color:var(--muted); font-size:.88rem}
    .form-grid{display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:14px}
    .field{display:flex; flex-direction:column; gap:8px}
    label{font-size:.92rem; font-weight:700; color:#2a4360}
    input,select,textarea{
      width:100%; border:1px solid #d9e2ee; border-radius:14px; padding:13px 14px; background:#fff; color:var(--text);
      outline:none; transition:.2s ease; font:inherit
    }
    input:focus,select:focus,textarea:focus{border-color:#8eb0ff; box-shadow:0 0 0 4px rgba(47,107,255,.10)}
    textarea{min-height:124px; resize:vertical}
    .form-actions{display:flex; flex-wrap:wrap; gap:12px; margin-top:6px}
    .footer{
      margin-top:18px;
      padding:26px 0 30px;
      color:#27415e;
    }
    .footer-inner{
      border-top:1px solid rgba(219,227,239,.85);
      padding-top:22px;
      display:grid;
      grid-template-columns:1.2fr .8fr;
      gap:18px;
      align-items:start;
    }
    .footer-links{display:flex; flex-wrap:wrap; gap:10px}
    .footer-links a{padding:8px 12px; border-radius:999px; background:#fff; border:1px solid var(--line); color:#34506f}
    .footer small{color:var(--muted); line-height:1.8}
    .floating{
      position:fixed; right:16px; bottom:16px; z-index:60; display:grid; gap:10px;
    }
    .float-btn{
      width:48px; height:48px; border-radius:16px; display:grid; place-items:center;
      background:linear-gradient(135deg,var(--brand),var(--brand2)); color:#fff; box-shadow:0 16px 30px rgba(47,107,255,.25)
    }
    .float-btn.secondary{background:#fff; color:var(--text); border:1px solid var(--line)}
    .side-contact{
      position:fixed; left:16px; bottom:16px; z-index:55;
      width:min(320px, calc(100% - 32px));
      background:rgba(255,255,255,.96); border:1px solid rgba(219,227,239,.95); border-radius:20px; box-shadow:var(--shadow);
      padding:14px; display:none;
    }
    .side-contact.open{display:block}
    .side-contact .top{display:flex; justify-content:space-between; align-items:center; gap:10px}
    .side-contact img{width:104px; height:104px; object-fit:cover; border-radius:16px; border:1px solid var(--line); margin-top:10px}
    .fade-up{opacity:0; transform:translateY(14px); transition:opacity .7s ease, transform .7s ease}
    .fade-up.in{opacity:1; transform:none}
    .topline{display:flex; gap:10px; flex-wrap:wrap; margin-top:14px}
    .compact{display:flex; gap:12px; flex-wrap:wrap}
    .price-grid{display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:16px}
    .price{padding:18px; border:1px solid #e2eaf6; border-radius:18px; background:linear-gradient(180deg,#fff,#f8fbff)}
    .price strong{font-size:1.1rem}
    .price .num{font-size:1.6rem; font-weight:900; margin:8px 0 10px; color:#193f83}
    .service-network{display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:16px}
    .network-card ul,.help-card ul{margin:10px 0 0; padding-left:18px; color:var(--muted); line-height:1.8}
    .banner-strip{display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:14px}
    .banner-strip img{border-radius:18px; border:1px solid #e1e8f3; box-shadow:var(--shadow)}
    .articles{display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:16px}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-4,.reviews,.price-grid,.service-network,.footer-inner,.articles,.grid-4,.banner-strip{grid-template-columns:1fr}
      .hero-stats,.mini-grid,.form-grid{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{flex-wrap:wrap}
    }
    @media (max-width: 640px){
      .container{width:min(var(--max), calc(100% - 24px))}
      .hero-copy,.hero-panel,.section-card,.case-card,.article-card,.review-card,.faq-item,.pricing-card,.timeline-card,.help-card,.network-card,.compare-card,.form-card{padding:18px}
      h1{font-size:2rem}
      .section-head{align-items:start; flex-direction:column}
      table{min-width:880px}
    }