:root {
  --bg: #fbfbfd;
  --text: #1d1d22;
  --muted: #5d5d68;
  --accent: #2f5fd0;
  --line: #e2e2e8;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #121216; --text: #e8e8ee; --muted: #a2a2ae; --accent: #8aaaff; --line: #2c2c34; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 40px 16px 64px; }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 4px; }
h2 { font-size: 1.2rem; margin: 2em 0 0.4em; }
p, li { margin: 0.5em 0; }
ul { padding-left: 1.3em; }
a { color: var(--accent); }
.meta { color: var(--muted); margin: 0 0 2em; }
.summary { border-left: 3px solid var(--accent); padding: 2px 0 2px 16px; font-size: 1.05rem; }
footer { margin-top: 3em; padding-top: 1em; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.9rem; }