:root{--bg:#ffffff;--text:#0b1320;--muted:#4b5563;--brand:#10b981;--border:#e5e7eb}
*{box-sizing:border-box}
body{margin:0;font:16px/1.55 system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:linear-gradient(180deg,#f8fafc,#fff)}
.wrap{max-width:1080px;margin:0 auto;padding:32px 20px}
h1{font-size:36px;margin:4px 0 4px;text-align:center;color:#0b1320}
.lead{margin:0 auto 18px;text-align:center;color:var(--muted);max-width:760px}
.actions{display:flex;gap:10px;justify-content:center;margin:14px 0 30px}
.btn{display:inline-block;padding:12px 16px;border-radius:10px;border:1px solid var(--border);text-decoration:none}
.btn.primary{background:var(--brand);color:#fff;border-color:#0ea371}
.btn.secondary{background:#fff;color:#0b1320}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:18px}
.panel{background:#fff;border:1px solid var(--border);border-radius:12px;padding:10px;box-shadow:0 10px 24px rgba(2,6,23,.04)}
.panel h3{margin:0 0 8px;font-size:14px;color:#334155}
.frame-box{height:420px;border:1px solid var(--border);border-radius:10px;overflow:hidden;background:#eef2f7;display:flex;align-items:center;justify-content:center}
.frame-box iframe{width:100%;height:100%;border:0;background:#fff}
.code{font-family:ui-monospace,Consolas,monospace;background:#0b1220;color:#e5edf7;border-radius:8px;padding:12px 14px;display:inline-block;margin-top:8px}
.footer{margin:30px 0 10px;text-align:center;color:#94a3b8;font-size:14px}
@media (max-width:900px){.grid{grid-template-columns:1fr} .frame-box{height:360px}}