:root {
  --bg:#f6f7f9; --card:#fff; --text:#111; --muted:#6b7280; --border:#e5e7eb;
  --brand:#111;
  --danger:#b91c1c; --success:#065f46; --success-bg:#ecfdf5; --success-border:#a7f3d0;
}
*{box-sizing:border-box}
body{margin:0;font-family:Arial,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text)}
a{color:inherit}
.topbar{background:var(--brand);color:#fff;padding:12px 16px;display:flex;justify-content:space-between;align-items:center}
.container{max-width:1100px;margin:0 auto;padding:18px 16px}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:14px}
.grid{display:grid;gap:12px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
@media (max-width:800px){.grid-2{grid-template-columns:1fr}}
.btn{display:inline-block;border-radius:10px;padding:10px 12px;border:1px solid var(--brand);background:var(--brand);color:#fff;text-decoration:none;cursor:pointer}
.btn-outline{background:#fff;color:var(--brand)}
.table{width:100%;border-collapse:collapse;font-size:14px}
.table th,.table td{padding:10px;border-bottom:1px solid #eee;text-align:left}
.muted{color:var(--muted)}
.error{color:var(--danger);font-size:13px;margin-top:6px}
.success{background:var(--success-bg);border:1px solid var(--success-border);color:var(--success);padding:10px;border-radius:12px;margin-bottom:12px}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.input,select{width:100%;padding:10px;border:1px solid #ddd;border-radius:10px}
.right{margin-left:auto}
.nav a{color:#fff;text-decoration:none;margin-right:12px;font-size:14px}
code{background:#f3f4f6;padding:2px 6px;border-radius:6px}
pre{white-space:pre-wrap}
.badge{display:inline-block;padding:2px 8px;border-radius:999px;border:1px solid #ddd;font-size:12px}