:root {
  color-scheme: light dark;
  --bg: #f3efe8;
  --paper: #fffdf8;
  --ink: #2b2b2b;
  --muted: #6b6560;
  --link: #c0392b;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1b1a;
    --paper: #262523;
    --ink: #ece8e2;
    --muted: #a39d96;
    --link: #ff8a7a;
  }
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main {
  max-width: 720px;
  margin: 24px auto;
  padding: 24px 16px;
  background: var(--paper);
  border-radius: 12px;
}
h1 { font-size: 1.6rem; line-height: 1.3; margin-top: 0; }
h2 { font-size: 1.15rem; margin-top: 2rem; }
.meta { color: var(--muted); }
a { color: var(--link); }
ul { padding-left: 1.25rem; }

/* Site pages: header, buttons, example grids, footer. */
.site { max-width: 720px; margin: 0 auto; padding: 16px 16px 0; display: flex;
  align-items: center; gap: 12px; flex-wrap: wrap; }
.site .brand { display: flex; align-items: center; gap: 10px; color: var(--ink);
  text-decoration: none; font-weight: 700; font-size: 1.15rem; }
.site .brand img { width: 36px; height: 36px; border-radius: 8px; }
.site nav { display: flex; gap: 14px; flex-wrap: wrap; margin-left: auto; font-size: .95rem; }
.lead { font-size: 1.1rem; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 1.25rem 0; }
.button { display: inline-block; padding: 10px 18px; border-radius: 999px;
  background: var(--link); color: #fff; text-decoration: none; font-weight: 600; }
.button.secondary { background: transparent; color: var(--link); border: 2px solid var(--link); }
table.grid { border-collapse: collapse; margin: 1rem 0; font-variant-numeric: tabular-nums; }
table.grid td { width: 2.4rem; height: 2.4rem; text-align: center; border: 1.5px solid var(--muted); }
table.grid td.x { background: color-mix(in srgb, var(--link) 22%, transparent);
  text-decoration: line-through; font-weight: 700; }
.caption { color: var(--muted); font-size: .9rem; margin-top: -.5rem; }
dt { font-weight: 700; margin-top: 1.25rem; }
dd { margin: .25rem 0 0; }
footer { max-width: 720px; margin: 0 auto 32px; padding: 0 16px; color: var(--muted);
  font-size: .9rem; display: flex; gap: 14px; flex-wrap: wrap; }