:root{
  --bg:#f6f7f5;
  --surface:#ffffff;
  --ink:#182433;
  --ink-2:#4a5a6b;
  --ink-3:#7c8b99;
  --line:#e2e7e9;
  --brand:#163a5f;
  --brand-2:#245b8f;
  --accent:#e2722c;
  --accent-soft:#fdf1e7;
  --ok:#2c7a5b;
  --shadow:0 1px 2px rgba(20,40,60,.05),0 8px 28px rgba(20,40,60,.06);
  --radius:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font:15px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand-2);text-decoration:none}
a:hover{text-decoration:underline}
img{display:block;max-width:100%}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav .wrap{height:62px;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink);font-size:16px;letter-spacing:.2px}
.brand:hover{text-decoration:none}
.brand .mark{width:28px;height:28px;border-radius:8px;background:var(--brand);display:grid;place-items:center}
.brand .mark svg{width:18px;height:18px}
.brand small{font-weight:500;color:var(--ink-3);font-size:11px;letter-spacing:1.2px;text-transform:uppercase;margin-left:2px}
.nav-links{display:flex;gap:22px;margin-left:auto;align-items:center}
.nav-links a{color:var(--ink-2);font-size:14px}
.nav-links a:hover{color:var(--brand);text-decoration:none}
.nav .btn{padding:8px 15px;font-size:13px;color:#fff}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:9px;border:1px solid transparent;
  padding:11px 20px;font-size:14px;font-weight:600;cursor:pointer;transition:.18s;white-space:nowrap}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 4px 14px rgba(22,58,95,.18)}
.btn-primary:hover{background:var(--brand-2)}
.btn-accent{background:var(--accent);color:#fff;box-shadow:0 4px 14px rgba(226,114,44,.2)}
.btn-accent:hover{background:#c9611f}
.btn-ghost{background:#fff;color:var(--brand);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--brand-2);background:#fafbfc}
.btn-sm{padding:7px 13px;font-size:12.5px;border-radius:7px}

/* ---------- hero ---------- */
.hero{background:linear-gradient(160deg,#fff 0%,#f2f6f9 58%,#eaf1f4 100%);border-bottom:1px solid var(--line);overflow:hidden}
.hero .wrap{padding-top:64px;padding-bottom:56px;display:grid;grid-template-columns:1.08fr .92fr;gap:54px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;background:var(--accent-soft);color:#a5501a;border:1px solid #f3d7bf;
  border-radius:100px;padding:5px 13px;font-size:12px;font-weight:600;letter-spacing:.3px}
.hero h1{font-size:42px;line-height:1.22;margin:20px 0 16px;letter-spacing:-.8px;font-weight:750}
.hero h1 span{color:var(--accent)}
.hero p{font-size:16px;color:var(--ink-2);margin:0 0 26px;max-width:540px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.hero-meta{margin-top:26px;display:flex;gap:24px;flex-wrap:wrap;font-size:12.5px;color:var(--ink-3)}
.hero-meta b{display:block;font-size:18px;color:var(--brand);font-weight:700;line-height:1.3}
.hero-visual{position:relative;border-radius:18px;overflow:hidden;box-shadow:0 22px 60px rgba(20,45,70,.18);border:1px solid #d8e2e8;background:#fff}
.hero-visual img{width:100%;aspect-ratio:16/10;object-fit:cover}
.hero-visual .cap{position:absolute;left:0;right:0;bottom:0;padding:12px 16px;color:#fff;font-size:12.5px;
  background:linear-gradient(transparent,rgba(12,30,45,.78));display:flex;justify-content:space-between}

/* ---------- sections ---------- */
section{padding:58px 0}
.sec-head{margin-bottom:28px}
.sec-head .kicker{font-size:12px;letter-spacing:2px;text-transform:uppercase;color:var(--accent);font-weight:700}
.sec-head h2{font-size:27px;margin:8px 0 8px;letter-spacing:-.4px}
.sec-head p{color:var(--ink-2);margin:0;max-width:720px}

/* ---------- cards ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);
  display:flex;flex-direction:column;transition:.2s}
.card:hover{transform:translateY(-3px);box-shadow:0 12px 34px rgba(20,40,60,.11)}
.card .thumb{aspect-ratio:16/9;background:#eef2f4;overflow:hidden;position:relative}
.card .thumb img{width:100%;height:100%;object-fit:cover;transition:.35s}
.card:hover .thumb img{transform:scale(1.04)}
.card .tag{position:absolute;top:10px;left:10px;background:rgba(14,36,56,.82);color:#fff;font-size:11px;padding:4px 9px;border-radius:6px}
.card .body{padding:16px 17px 18px;display:flex;flex-direction:column;flex:1}
.card h3{font-size:16.5px;margin:0 0 6px}
.card .desc{font-size:13px;color:var(--ink-2);margin:0 0 14px;flex:1}
.card .facts{display:flex;gap:12px;font-size:11.5px;color:var(--ink-3);margin-bottom:14px;flex-wrap:wrap}
.card .facts b{color:var(--brand);font-weight:700}
.card .acts{display:flex;gap:8px;align-items:center}

/* ---------- feature grid ---------- */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.feat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 18px}
.feat .num{font-size:11px;font-weight:700;color:var(--accent);letter-spacing:1.5px}
.feat h4{margin:9px 0 7px;font-size:15px}
.feat p{margin:0;font-size:13px;color:var(--ink-2);line-height:1.6}

/* ---------- flow ---------- */
.flow{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.flow .step{padding:24px 22px;position:relative;border-right:1px solid var(--line)}
.flow .step:last-child{border-right:0}
.flow .step .n{width:30px;height:30px;border-radius:9px;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:13px;font-weight:700;margin-bottom:12px}
.flow .step h4{margin:0 0 8px;font-size:15px}
.flow .step p{margin:0;font-size:13px;color:var(--ink-2)}
.flow .step code{background:#f1f4f6;padding:1px 5px;border-radius:4px;font-size:12px;color:#b3541c}

/* ---------- cta band ---------- */
.cta{background:var(--brand);color:#fff;border-radius:16px;padding:36px 40px;display:flex;align-items:center;gap:30px;flex-wrap:wrap}
.cta h3{margin:0 0 6px;font-size:22px}
.cta p{margin:0;color:#c7d8e6;font-size:14px;max-width:560px}
.cta .btn{margin-left:auto}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);margin-top:36px;padding:28px 0 40px;color:var(--ink-3);font-size:12.5px}
footer .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
footer a{color:var(--ink-2)}

/* ---------- studio ---------- */
.studio{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.studio-top{padding:20px 22px;border-bottom:1px solid var(--line);display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.studio-top .title{font-weight:700;font-size:15px;margin-right:auto}
.studio-grid{display:grid;grid-template-columns:1fr 300px;min-height:420px}
.studio-main{padding:20px 22px;border-right:1px solid var(--line);display:flex;flex-direction:column}
.studio-side{padding:20px 18px;background:#fafbfc}
textarea#spec{width:100%;flex:1;min-height:330px;resize:vertical;border:1px solid var(--line);border-radius:10px;padding:14px;
  font:12.5px/1.6 ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;color:#22303e;background:#fcfdfd;outline:none}
textarea#spec:focus{border-color:var(--brand-2);box-shadow:0 0 0 3px rgba(36,91,143,.1)}
.side-block{margin-bottom:22px}
.side-block h5{margin:0 0 9px;font-size:12px;letter-spacing:1px;text-transform:uppercase;color:var(--ink-3)}
.side-block .row{display:flex;gap:8px;flex-wrap:wrap}
.chip{border:1px solid var(--line);background:#fff;border-radius:7px;padding:6px 10px;font-size:12.5px;color:var(--ink-2);cursor:pointer}
.chip:hover,.chip.on{border-color:var(--brand-2);color:var(--brand);background:#f0f6fb}
.stat{display:flex;justify-content:space-between;font-size:13px;padding:5px 0;border-bottom:1px dashed var(--line)}
.stat span:last-child{font-weight:700;color:var(--brand)}
.msg{margin-top:14px;padding:10px 13px;border-radius:8px;font-size:13px;display:none}
.msg.ok{display:block;background:#eaf6f0;color:var(--ok);border:1px solid #c9e6d8}
.msg.err{display:block;background:#fdecec;color:#a33;border:1px solid #f3cccc}
.hint{font-size:12.5px;color:var(--ink-3);margin:10px 0 0}
.preview{position:fixed;inset:0;z-index:100;background:#0e1620;display:none;flex-direction:column}
.preview.on{display:flex}
.preview-bar{height:52px;flex:none;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px;padding:0 16px}
.preview-bar .t{font-weight:700;font-size:14px;margin-right:auto}
.preview iframe{flex:1;width:100%;border:0;background:#fff}
.spec-table{width:100%;border-collapse:collapse;font-size:13px;background:#fff}
.spec-table th,.spec-table td{border:1px solid var(--line);padding:9px 11px;text-align:left;vertical-align:top}
.spec-table th{background:#f5f8fa;width:150px;font-weight:600}
.spec-table code{color:#b3541c;font-size:12px}

@media(max-width:960px){
  .hero .wrap{grid-template-columns:1fr;gap:30px;padding-top:44px}
  .hero h1{font-size:33px}
  .cards{grid-template-columns:repeat(2,1fr)}
  .features{grid-template-columns:repeat(2,1fr)}
  .studio-grid{grid-template-columns:1fr}
  .studio-main{border-right:0;border-bottom:1px solid var(--line)}
  .flow{grid-template-columns:1fr}
  .flow .step{border-right:0;border-bottom:1px solid var(--line)}
  .flow .step:last-child{border-bottom:0}
}
@media(max-width:620px){
  .wrap{padding:0 16px}
  .cards,.features{grid-template-columns:1fr}
  .hero h1{font-size:28px}
  .nav-links a:not(.btn){display:none}
  .cta{padding:26px 22px}
  .cta .btn{margin-left:0}
}