:root{
    --ink:#0f172a; --muted:#5b6b82; --line:#e3e8ef; --bg:#ffffff; --soft:#f6f8fb;
    --brand:#0b3d91; --brand-soft:#e8effc; --accent:#0ea5a4;
    --radius:14px; --max:1120px;
  }
  *{box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{margin:0;background:var(--bg);color:var(--ink);
    font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
    -webkit-font-smoothing:antialiased}
  img{max-width:100%;display:block}
  a{color:inherit;text-decoration:none}
  .wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
  .muted{color:var(--muted)}
  .eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--brand);font-weight:700}
  h1,h2,h3{line-height:1.2;margin:0}
  h1{font-size:clamp(30px,4.6vw,52px);letter-spacing:-.02em}
  h2{font-size:clamp(24px,3vw,34px);letter-spacing:-.01em}
  h3{font-size:18px}
  section{padding:76px 0;border-top:1px solid var(--line)}
  section.tight{padding:56px 0}
  .lead{font-size:18px;color:var(--muted);max-width:62ch}

  /* header */
  header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
  .nav{display:flex;align-items:center;gap:28px;height:68px}
  .logo{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.01em}
  .logo .mark{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--accent));display:grid;place-items:center;color:#fff;font-size:14px}
  .nav nav{display:flex;gap:24px;margin-left:auto;font-size:14px}
  .nav nav a{color:var(--muted)}
  .nav nav a:hover{color:var(--ink)}
  .btn{display:inline-flex;align-items:center;gap:8px;padding:11px 18px;border-radius:10px;font-weight:650;font-size:14px;border:1px solid transparent;cursor:pointer}
  .btn.primary{background:var(--brand);color:#fff}
  .btn.ghost{border-color:var(--line);background:#fff}
  .btn:hover{opacity:.92}
  .menu-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:8px;padding:8px 10px}

  /* hero */
  .hero{padding:84px 0 64px;border-top:0}
  .hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
  .hero .lead{margin:20px 0 28px}
  .cta-row{display:flex;gap:12px;flex-wrap:wrap}
  .stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:44px}
  .stat{border:1px solid var(--line);border-radius:var(--radius);padding:18px}
  .stat b{display:block;font-size:26px;letter-spacing:-.02em}
  .stat span{font-size:13px;color:var(--muted)}
  .hero-art{border-radius:20px;overflow:hidden;border:1px solid var(--line);background:var(--soft);aspect-ratio:4/3;display:grid;place-items:center;text-align:center;color:var(--muted);font-size:13px}

  /* cards */
  .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
  .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
  .grid-2{display:grid;grid-template-columns:1fr 1fr;gap:24px}
  .card{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
  .card .ph{aspect-ratio:1/1;background:var(--soft);display:grid;place-items:center;color:#93a2b8;font-size:12px;border-bottom:1px solid var(--line)}
  .card .body{padding:16px 16px 18px}
  .card h3{margin-bottom:6px}
  .card p{margin:0;font-size:14px;color:var(--muted)}
  .tag{display:inline-block;font-size:11px;padding:3px 8px;border-radius:999px;background:var(--brand-soft);color:var(--brand);font-weight:700;margin-bottom:10px}

  table{width:100%;border-collapse:collapse;font-size:14px;margin-top:18px}
  th,td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--line)}
  th{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:700;background:var(--soft)}
  tbody tr:last-child td{border-bottom:0}

  .list{list-style:none;padding:0;margin:18px 0 0;display:grid;gap:12px}
  .list li{display:flex;gap:10px;font-size:15px}
  .list li::before{content:"";width:18px;height:18px;flex:none;border-radius:50%;background:var(--brand-soft);border:1px solid #cfdcf7;margin-top:3px}

  .steps{counter-reset:s;display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:24px}
  .step{position:relative;border:1px solid var(--line);border-radius:var(--radius);padding:20px}
  .step::before{counter-increment:s;content:counter(s);position:absolute;top:-12px;left:18px;width:26px;height:26px;border-radius:50%;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:13px;font-weight:700}
  .step b{display:block;margin-bottom:6px}
  .step span{font-size:14px;color:var(--muted)}

  .badges{display:flex;gap:14px;flex-wrap:wrap;margin-top:20px}
  .badge{border:1px dashed #c9d4e4;border-radius:10px;padding:14px 18px;font-size:13px;color:var(--muted);background:var(--soft)}

  .show{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
  .show .ph{aspect-ratio:16/10;background:var(--soft);display:grid;place-items:center;color:#93a2b8;font-size:12px}
  .show .body{padding:14px 16px}
  .show b{display:block}
  .show span{font-size:13px;color:var(--muted)}

  /* contact */
  .contact{background:var(--soft)}
  form{display:grid;gap:12px;margin-top:20px}
  .row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
  input,textarea,select{width:100%;padding:12px 14px;border:1px solid #cbd5e1;border-radius:10px;font:inherit;background:#fff}
  input:focus,textarea:focus,select:focus{outline:2px solid var(--brand-soft);border-color:var(--brand)}
  textarea{min-height:110px;resize:vertical}
  .fine{font-size:12px;color:var(--muted);margin-top:10px}
  .contact-side{display:grid;gap:16px;align-content:start}
  .contact-item{border:1px solid var(--line);border-radius:12px;padding:16px;background:#fff}
  .contact-item b{display:block;font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:4px}

  footer{padding:34px 0;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
  .foot{display:flex;gap:16px;flex-wrap:wrap;align-items:center;justify-content:space-between}

  @media (max-width:900px){
    .hero-grid,.grid-2{grid-template-columns:1fr}
    .grid-4{grid-template-columns:1fr 1fr}
    .grid-3,.steps{grid-template-columns:1fr}
    .nav nav{display:none}
    .menu-toggle{display:block}
    .nav nav.open{display:flex;position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;
      padding:16px 24px;border-bottom:1px solid var(--line);gap:14px}
  }
  @media (max-width:560px){
    .grid-4{grid-template-columns:1fr}
    .stats{grid-template-columns:1fr}
    .row{grid-template-columns:1fr}
  }

/* 全流程产线条 */
.lines{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-top:28px}
.lines > div{border:1px solid var(--line);border-radius:12px;padding:16px 12px;text-align:center;background:var(--soft)}
.lines b{display:block;font-size:26px;letter-spacing:-.02em;line-height:1.1}
.lines span{font-size:12px;color:var(--muted)}
@media (max-width:900px){.lines{grid-template-columns:repeat(2,1fr)}}