:root{--bg:#f8fafc;--ink:#0f172a;--muted:#475569;--line:#e2e8f0;--btn:#2563eb}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 system-ui}
.wrap{max-width:980px;margin:32px auto;padding:0 16px}
h1{margin:0 0 6px 0}
.muted{color:var(--muted)}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px;margin:12px 0}
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.row{display:flex;align-items:center;justify-content:space-between;gap:12px}
.btn{display:inline-block;padding:8px 12px;background:var(--btn);color:#fff;text-decoration:none;border-radius:10px;font-weight:700}
.badge{display:inline-block;font-size:12px;padding:3px 8px;border:1px solid var(--line);border-radius:999px;margin-right:6px;color:var(--muted)}
pre.preview{white-space:pre-wrap;background:#f8fafc;border:1px dashed var(--line);border-radius:10px;padding:10px;margin:10px 0 0 0}
@media (max-width:840px){.grid{grid-template-columns:1fr}}