:root{
  --ink:#111; --ink-soft:#666; --red:#cc0000; --border:#eee; --bg:#fff;
  --radius:14px; --wrap:960px; --gutter:16px;
}
*{box-sizing:border-box} body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.7 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu}
a{color:inherit;text-decoration:none}
.container{max-width:var(--wrap);margin:0 auto;padding:24px var(--gutter)}
.topbar{border-bottom:1px solid #f2f2f2;position:sticky;top:0;background:#fff;z-index:10}
.nav{display:flex;gap:14px;align-items:center;justify-content:space-between;padding:10px var(--gutter)}
.brand{font-weight:800;letter-spacing:.3px;font-size:22px}.brand b{color:var(--red)}
.card{background:#fff;border:1px solid var(--border);border-radius:14px;padding:20px}
h1{font-size:28px;margin:8px 0 12px} h2{font-size:20px;margin:18px 0 8px}
small, .muted{color:var(--ink-soft)} ul{padding-left:22px}
.footer{border-top:1px solid var(--border);color:#888;font-size:13px;margin-top:28px}
.footer a{color:#444;text-decoration:none}
.note{background:#fff8f0;border:1px solid #ffe2bb;color:#885; padding:10px 12px;border-radius:12px;margin:12px 0}
.btn{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--border);padding:8px 12px;border-radius:999px;text-decoration:none}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media (max-width:900px){ .grid2{grid-template-columns:1fr} }