:root {
  --bg: #ffffff;
  --fg: #111827;
  --muted: #6b7280;
  --primary: #2563eb;
  --border: #e5e7eb;
}
:root[data-theme="dark"] {
  --bg: #0b1220;
  --fg: #e5e7eb;
  --muted: #94a3b8;
  --primary: #60a5fa;
  --border: #1f2937;
}
html, body { margin: 0; padding: 0; }
body {
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--fg); background: var(--bg);
  line-height: 1.7;
}
.container { max-width: 980px; margin: 0 auto; padding: 24px; }
.site-header, .site-footer { border-bottom: 1px solid var(--border); }
.site-footer { border-top: 1px solid var(--border); border-bottom: 0; }
.brand { font-weight: 700; color: var(--fg); text-decoration: none; }
.nav a { margin-left: 16px; color: var(--muted); text-decoration: none; }
.nav .btn { padding: 6px 10px; border-radius: 8px; }
h1 { font-size: 32px; margin: 16px 0 8px; }
h2 { font-size: 22px; margin: 24px 0 12px; }
p { margin: 12px 0; }
table { width: 100%; border-collapse: collapse; margin: 12px 0 24px; }
th, td { border: 1px solid var(--border); padding: 12px; text-align: left; vertical-align: top; }
th { background: #f8fafc; }
.btn { display: inline-block; background: var(--primary); color: #fff; padding: 10px 16px; border-radius: 8px; text-decoration: none; }
.list-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card { border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.muted { color: var(--muted); }
ul { padding-left: 20px; }