:root{
  --bg:#ffffff;
  --panel:#f8f9fa;
  --panel-2:#f1f3f5;
  --text:#111111;
  --muted:#555555;
  --accent:#0056b3;
  --border:#dee2e6;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--text);font:14px/1.6 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,Helvetica,Arial}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1100px;margin:24px auto;padding:0 16px 80px}

.site-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.9);backdrop-filter:blur(6px);border-bottom:1px solid var(--border)}
.site-header .bar{display:flex;align-items:center;gap:16px;padding:12px 0;flex-wrap:wrap}
.site-title{margin:0;font-size:20px;font-weight:700;letter-spacing:.2px}
.site-nav{margin-left:auto;display:flex;gap:10px;flex-wrap:wrap}
.site-nav a{padding:6px 10px;border-radius:10px}
.site-nav a:hover{background:var(--panel-2)}

.panel, section.panel{background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:18px;margin:18px 0}
h1{font-size:22px;margin:0 0 10px}
h2{font-size:18px;margin:8px 0 10px}
h3{font-size:14px;margin:14px 0 6px;color:var(--muted);text-transform:uppercase;letter-spacing:.3px}

.table, table{width:100%;border-collapse:collapse;margin:8px 0 12px}
th,td{border:1px solid var(--border);padding:8px 10px;vertical-align:top}
th{text-align:left;background:var(--panel-2)}
tr:hover td{background:#fdfdfd}

.small{font-size:12px;color:var(--muted)}
.tag{display:inline-block;background:#e9ecef;border:1px solid var(--border);padding:4px 8px;border-radius:999px;font-size:12px}
code.inline{background:var(--panel-2);padding:2px 6px;border:1px solid var(--border);border-radius:6px}
pre{background:var(--panel-2);border:1px solid var(--border);border-radius:12px;padding:12px;overflow:auto}
.kbd{display:inline-block;border:1px solid var(--border);background:var(--panel-2);border-radius:6px;padding:2px 6px;font-family:ui-monospace, SFMono-Regular, Menlo, Consolas, 'Liberation Mono', monospace;font-size:12px}

.grid{display:grid;grid-template-columns:280px 1fr;gap:18px}
@media (max-width:960px){.grid{grid-template-columns:1fr}}

.callout{border:1px dashed var(--border);background:#fafafa;padding:12px;border-radius:12px}
footer{margin-top:24px;color:var(--muted);font-size:12px}

.toc{position:sticky;top:64px;background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:8px 12px;display:flex;gap:4px;flex-wrap:wrap;align-items:center}
.toc a{padding:6px 10px;border-radius:10px;white-space:nowrap}
.toc a:hover{background:var(--panel-2)}

/* print */
@media print{
  .site-header,.toc{display:none}
  .wrap{max-width:100%;padding:0}
  section.panel{break-inside:avoid;border-color:#ddd;background:#fff}
  pre{background:#fbfbfb;border-color:#eee}
  a{color:#000;text-decoration:underline}
}