:root {
  --bg: #ffffff;
  --fg: #1c1c1e;
  --muted: #6b6b70;
  --accent: #007aff;
  --rule: #e5e5ea;
  --code-bg: #f2f2f7;
}

body.dark {
  --bg: #000000;
  --fg: #f2f2f7;
  --muted: #98989f;
  --accent: #0a84ff;
  --rule: #2c2c2e;
  --code-bg: #1c1c1e;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

h1 { font-size: 28px; line-height: 1.3; margin: 24px 0 12px; font-weight: 700; }
h2 { font-size: 22px; line-height: 1.3; margin: 32px 0 12px; font-weight: 600; }
h3 { font-size: 18px; line-height: 1.4; margin: 24px 0 8px; font-weight: 600; }

p, ul, ol { margin: 12px 0; }
ul, ol { padding-left: 22px; }
li { margin: 6px 0; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

hr { border: none; border-top: 1px solid var(--rule); margin: 32px 0; }

strong { font-weight: 600; }
em { font-style: italic; }

code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
}

blockquote {
  border-left: 3px solid var(--accent);
  margin: 16px 0;
  padding: 4px 16px;
  color: var(--muted);
}

footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px 20px 32px;
  color: var(--muted);
  font-size: 14px;
  border-top: 1px solid var(--rule);
}

.loading { color: var(--muted); }

body.catalog ul { list-style: none; padding: 0; }
body.catalog li { padding: 8px 0; border-bottom: 1px solid var(--rule); }