/* chatstronomy.com — shared styles. No build step; keep this readable. */
:root {
  --bg: #ffffff; --fg: #1b1f24; --muted: #5b6570; --line: #e3e7ec;
  --accent: #2b5f9e; --card: #f7f9fa; --warn-bg: #fff6ed; --warn-line: #e8b98a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151a; --fg: #e8ecef; --muted: #9aa5b0; --line: #262c33;
    --accent: #7fb2ec; --card: #191d24; --warn-bg: #2a1f14; --warn-line: #7a5a33;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header { padding: 48px 0 24px; border-bottom: 1px solid var(--line); }
header .brand { font-size: 1.15rem; font-weight: 700; letter-spacing: -0.01em; }
header .brand a { color: inherit; text-decoration: none; }
h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); line-height: 1.2; margin: 28px 0 8px; }
h2 { font-size: 1.15rem; margin: 34px 0 10px; }
h3 { font-size: 1rem; margin: 22px 0 6px; }
.updated { color: var(--muted); font-size: .9rem; margin: 0 0 8px; }
.lede { color: var(--muted); font-size: 1.05rem; }
a { color: var(--accent); }
code {
  background: var(--card); border: 1px solid var(--line); border-radius: 4px;
  padding: 1px 5px; font-size: .9em;
}
ul { padding-left: 1.2em; }
li { margin: 6px 0; }
.callout {
  background: var(--warn-bg); border: 1px solid var(--warn-line);
  border-radius: 10px; padding: 16px 18px; margin: 20px 0;
}
.callout p:first-child { margin-top: 0; }
.callout p:last-child { margin-bottom: 0; }
footer {
  margin-top: 48px; padding: 24px 0 60px; border-top: 1px solid var(--line);
  color: var(--muted); font-size: .9rem;
}
footer a { margin-right: 14px; }