:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5b5b5b;
  --line: #e4e4e4;
  --accent: #1558d6;
  --code-bg: #f4f4f5;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a;
    --fg: #e9e9ea;
    --muted: #a2a2a6;
    --line: #2c2d31;
    --accent: #7aa2f7;
    --code-bg: #232428;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.wrap {
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 20px 64px;
}

h1 {
  font-size: 1.9rem;
  margin: 0 0 4px;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 1.15rem;
  margin: 32px 0 8px;
}

.lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 8px;
}

section { border-top: 1px solid var(--line); padding-top: 8px; }

p { margin: 8px 0; }

ul { margin: 8px 0; padding-left: 20px; }

li { margin: 4px 0; }

a { color: var(--accent); }

code {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 5px;
  font: 0.9em/1.5 ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  word-break: break-all;
}

footer {
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}