:root{
  --bg:#f7f7fb;
  --card:#fff;
  --text:#1b1b1f;
  --muted:#6b6b76;
  --accent:#2563eb;
  --container-width:1000px;
}
*{box-sizing:border-box}
body{
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  margin:0;
  padding:0;
}
.container{
  max-width:var(--container-width);
  margin:0 auto;
  padding:28px;
}
.site-header{
  background:linear-gradient(90deg,#fff 0%, #f3f6ff 100%);
  border-bottom:1px solid #e6e9f2;
  padding:28px 0;
}
.site-header h1{margin:0;font-size:28px}
.subtitle{margin-top:6px;color:var(--muted)}

main.container{
  display:flex;
  gap:24px;
  align-items:flex-start;
  padding-top:18px;
}
.toc{
  width:220px;
  background:transparent;
  position:sticky;
  top:18px;
}
.toc h3{margin:0 0 8px 0}
.toc ul{list-style:none;padding:0;margin:0}
.toc li{margin-bottom:8px}
.toc a{color:var(--accent);text-decoration:none}

.content{flex:1}
.content article{background:var(--card);border-radius:10px;padding:20px;margin-bottom:18px;box-shadow:0 1px 0 rgba(20,20,30,0.03)}
.card-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;padding:0;list-style:none;margin:0}
.card{padding:12px;border-radius:8px;border:1px solid #eef2ff;background:linear-gradient(180deg,#fff,#fbfdff)}

.prompt{
  background:#0b1220;color:#e6f1ff;padding:12px;border-radius:8px;overflow:auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, "Roboto Mono", "Courier New", monospace;
  font-size:13px;
}

.site-footer{padding:24px 0;color:var(--muted);border-top:1px solid #eee;margin-top:18px;text-align:center}