:root {
  --bg: #0f0f13;
  --surface: #17171d;
  --border: #26262f;
  --text: #e8e8ee;
  --muted: #8b8b99;
  --accent: #e11d48;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 system-ui, -apple-system, "Segoe UI", sans-serif;
}
.layout { display: flex; max-width: 1080px; margin: 0 auto; padding: 32px 16px; gap: 40px; }
.sidebar { width: 200px; flex-shrink: 0; position: sticky; top: 32px; align-self: flex-start; max-height: calc(100vh - 64px); overflow-y: auto; }
.brand { font-size: 22px; font-weight: 700; color: var(--text); text-decoration: none; }
.nav { display: grid; gap: 4px; margin-top: 20px; }
.nav a { color: var(--muted); text-decoration: none; padding: 4px 8px; border-radius: 6px; }
.nav a:hover { color: var(--text); background: var(--surface); }
.nav a.active { color: var(--accent); background: var(--surface); }
.content { flex: 1; min-width: 0; }
.content h1 { font-size: 30px; border-bottom: 1px solid var(--border); padding-bottom: 12px; }
.content h2 { font-size: 21px; margin-top: 36px; }
.content pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  overflow-x: auto;
}
.content code { font: 14px ui-monospace, SFMono-Regular, Menlo, monospace; }
.content :not(pre) > code { background: var(--surface); padding: 2px 6px; border-radius: 5px; }
.content table { border-collapse: collapse; width: 100%; margin: 16px 0; }
.content th, .content td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.content blockquote { border-left: 3px solid var(--accent); margin: 0; padding: 4px 16px; color: var(--muted); }
.content a { color: var(--accent); }
.toc { width: 180px; flex-shrink: 0; position: sticky; top: 32px; align-self: flex-start; display: grid; gap: 6px; max-height: calc(100vh - 64px); overflow-y: auto; }
.toc-title { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; }
.toc-item { color: var(--muted); font-size: 13px; }
footer { text-align: center; color: var(--muted); font-size: 13px; padding: 24px; }
.meta { color: var(--muted); font-size: 13px; margin-top: 32px; }

/* playgrounds */
.playground { border: 1px solid var(--border); border-radius: 10px; margin: 16px 0; overflow: hidden; background: var(--bg); }
.playground .pg-code { display: block; background: var(--surface); border: none; border-radius: 0; margin: 0; border-bottom: 1px solid var(--border); }
.pg-view { padding: 14px 16px; min-height: 20px; }
.pg-hint { color: var(--muted); font-size: 13px; }
.main { display: flex; gap: 40px; flex: 1; min-width: 0; }

/* shiki */
.content pre.shiki, .playground .pg-code {
  background-color: var(--surface) !important;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  overflow-x: auto;
}
.content pre.shiki code, .pg-code code { font: 14px ui-monospace, SFMono-Regular, Menlo, monospace; }