:root{
    --brand:#7b3fe4;      /* violet accent */
    --ink:#0f1a2a;
    --muted:#6b7280;
    --soft:#f5f7fb;
    --line:#e6e9f0;
    --ok:#0ea5e9;
    --danger:#ef4444;
    --radius:16px;
    --shadow:0 8px 28px rgba(15,26,42,.08);
    --card:#ffffff;
    --bg:#ffffff;
  }
  *{box-sizing:border-box}
  html,body{
    margin:0;padding:0;background:var(--bg);color:var(--ink);
    font-family:Inter,system-ui,Segoe UI,Arial,sans-serif;
    -webkit-font-smoothing:antialiased; -moz-osx-font-smoothing:grayscale;
  }
  img{max-width:100%;height:auto;display:block}
  a{color:var(--brand);text-decoration:none}
  .container{max-width:1120px;margin:0 auto;padding:20px}
  header{display:flex;align-items:center;gap:16px;padding:14px 0}
  header .brand{font-weight:800;color:var(--brand);font-size:20px}
  header nav{margin-left:auto}
  header nav a{color:var(--muted);font-size:14px}

  .hero{display:grid;grid-template-columns:1.1fr .9fr;gap:22px;margin-top:8px}
  .card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px}
  .card img{width:100%;border-radius:12px}
  h1{margin:4px 0 10px;font-size:28px;line-height:1.2}
  h2{margin:18px 0 8px;font-size:22px}
  p{line-height:1.7}
  .muted{color:var(--muted)}
  .btn{display:inline-block;background:var(--brand);color:#fff;padding:12px 18px;border-radius:12px;font-weight:600}
  .btn.dark{background:#111}
  .pricebox{display:flex;align-items:center;gap:10px;margin-top:10px;flex-wrap:wrap}
  .price{font-size:22px;font-weight:800}
  .badge{background:#efe9ff;color:#5926df;border:1px solid #d9ccff;padding:4px 10px;border-radius:999px;font-size:12px}
  .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
  .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
  .pill{display:inline-block;background:#f1f5ff;border:1px solid #e5edff;color:#243b6b;padding:6px 10px;border-radius:999px;font-size:12px;margin:4px 6px 0 0}
  .list{padding-left:18px}
  .specs{width:100%;border-collapse:collapse}
  .specs td{padding:10px;border-bottom:1px solid var(--line);font-size:14px;vertical-align:top}
  .features{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
  .feature{background:var(--soft);border:1px solid var(--line);padding:14px;border-radius:12px}
  .gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
  .roi{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
  .faq-item{border-bottom:1px solid var(--line);padding:12px 0}

  .sticky-bar{
    position:sticky;bottom:12px;z-index:20;background:#fff;border:1px solid var(--line);
    box-shadow:var(--shadow);padding:10px 12px;border-radius:14px;display:flex;gap:12px;
    align-items:center;justify-content:space-between;margin-top:18px
  }
  footer{margin:26px 0;color:var(--muted);font-size:13px;text-align:center}

  /* ====== 响应式：平板 ====== */
  @media (max-width: 1024px){
    .container{padding:16px}
    .hero{grid-template-columns:1fr;gap:14px}
    header nav a{font-size:13px}
    h1{font-size:26px}
    h2{font-size:20px}
    .grid-3{grid-template-columns:repeat(2,1fr)}
  }

  /* ====== 响应式：手机 ====== */
  @media (max-width: 768px){
    header{flex-wrap:wrap;gap:8px}
    header nav{width:100%;margin-left:0}
    header nav a{display:inline-block;margin-top:4px}
    .card{padding:14px;border-radius:14px}
    h1{font-size:22px}
    h2{font-size:18px}
    p,.specs td{font-size:14px}
    .pricebox{gap:8px}
    .grid-2{grid-template-columns:1fr}
    .grid-3{grid-template-columns:1fr}
    .btn{width:100%;text-align:center}
    .hero .card:first-child{order:1}
    .hero aside.card{order:2}
    .sticky-bar{
      bottom:8px;padding:10px;border-radius:12px;flex-wrap:wrap;gap:8px
    }
    .sticky-bar .btn{flex:1}
  }

  /* 刘海屏等安全区域处理 */
  @supports(padding:max(0px)){
    .sticky-bar{padding-left:max(12px,env(safe-area-inset-left));padding-right:max(12px,env(safe-area-inset-right));}
    body{padding-bottom:env(safe-area-inset-bottom)}
  }