:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5a6472;
  --accent: #2563eb;
  --border: #e5e7eb;
  --card: #f8fafc;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #e8eaed;
    --muted: #9aa4b2;
    --accent: #6ea8fe;
    --border: #232833;
    --card: #171a21;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header { padding: 64px 0 40px; border-bottom: 1px solid var(--border); }
header h1 { font-size: 2rem; margin: 0 0 8px; line-height: 1.2; }
header p { color: var(--muted); margin: 4px 0; }
nav {
  position: sticky; top: 0; background: var(--bg);
  border-bottom: 1px solid var(--border); z-index: 5;
}
nav .wrap { display: flex; flex-wrap: wrap; gap: 16px; padding: 12px 20px; }
nav a { color: var(--muted); text-decoration: none; font-size: 0.9rem; }
nav a:hover { color: var(--accent); }
section { padding: 40px 0; border-bottom: 1px solid var(--border); }
section h2 { font-size: 1.35rem; margin: 0 0 16px; }
h3 { font-size: 1.05rem; margin: 24px 0 8px; }
a { color: var(--accent); }
ul { padding-left: 20px; }
li { margin: 6px 0; }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; padding: 16px 20px; margin: 16px 0;
}
.muted { color: var(--muted); }
.note { font-size: 0.8rem; color: var(--muted); padding: 24px 0 48px; }
table { width: 100%; border-collapse: collapse; margin: 12px 0; }
th, td {
  text-align: left; padding: 8px 10px;
  border-bottom: 1px solid var(--border); font-size: 0.92rem;
}
th { color: var(--muted); font-weight: 600; }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--card); border: 1px solid var(--border);
  padding: 1px 5px; border-radius: 4px; font-size: 0.85em;
}
ol { padding-left: 22px; }
ol > li { margin: 12px 0; }
.contact { font-size: 0.9rem; }