:root{--brand:#14365A;--accent:#A8471F;--ink:#14263B;--muted:#4A5D72;--bg:#F4F8FC}
*{box-sizing:border-box}
body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--bg);line-height:1.5}
header{background:#fff;border-bottom:1px solid #eee;padding:12px 16px;display:flex;justify-content:space-between;align-items:center}
header a{color:var(--brand);text-decoration:none;font-weight:bold}
main{max-width:900px;margin:0 auto;padding:24px 16px}
h1{color:var(--brand);font-size:1.7rem;margin:.2em 0}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin:16px 0 20px}
.step{background:#fff;border:1px solid #eee;border-radius:10px;padding:12px}
.step b{color:var(--brand)}
.frame{background:#fff;border:1px solid #eee;border-radius:10px;overflow:hidden}
iframe{width:100%;height:1100px;border:0;display:block}
@media (max-width:600px){iframe{height:900px}}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:12px 20px;border-radius:8px;text-decoration:none;font-weight:bold}
.note{color:var(--muted);font-size:.92rem}
.alert{background:#fff4f4;border-left:4px solid #c0392b;padding:10px 12px;margin:16px 0;font-size:.95rem}