/* s1te — one stylesheet, themes via custom properties (PLAN §3b) */
:root, [data-theme="light"] {
  --bg: #fdfdfc; --fg: #222; --muted: #777; --link: #0645ad;
  --code-bg: #f4f4f4; --border: #ddd; --hl-bg: #f8f8f8;
}
[data-theme="dark"] {
  --bg: #16181d; --fg: #d6d6d6; --muted: #999; --link: #7db3ff;
  --code-bg: #22252c; --border: #333; --hl-bg: #1d2027;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg: #16181d; --fg: #d6d6d6; --muted: #999; --link: #7db3ff;
    --code-bg: #22252c; --border: #333; --hl-bg: #1d2027;
  }
}
* { box-sizing: border-box; }
body {
  margin: 2rem auto; max-width: 65ch; padding: 0 1rem;
  font: 16px/1.65 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg); color: var(--fg);
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
header { margin-bottom: 2.5rem; border-bottom: 1px solid var(--border); padding-bottom: 1rem; }
.sitename { font-weight: 700; font-size: 1.15rem; color: var(--fg); }
.subline { color: var(--muted); margin-left: .6rem; font-size: .9rem; }
header nav, footer { margin-top: .4rem; font-size: .85rem; }
header nav a, footer a { margin-right: .8rem; color: var(--muted); }
footer { margin-top: 3rem; border-top: 1px solid var(--border); padding-top: .8rem;
         display: flex; gap: .2rem; flex-wrap: wrap; align-items: center; }
article.teaser { margin-bottom: 2.2rem; }
article h1, article h2 { line-height: 1.25; }
.meta { color: var(--muted); font-size: .85rem; }
.tag { background: var(--code-bg); border-radius: 3px; padding: 0 .35em; margin-right: .25em; }
pre, .codehilite { background: var(--code-bg); padding: .7em 1em; overflow-x: auto;
                   border-radius: 4px; font-size: .86em; }
.codehilite pre { margin: 0; background: none; padding: 0; }
.codehilite { background: var(--hl-bg); }
img { max-width: 100%; }
.share { font-size: .85rem; color: var(--muted); }
.pager { display: flex; justify-content: space-between; margin: 2rem 0; }