:root {
  color-scheme: light dark;
  --bg: #f7f5ef;
  --card: #fffdf8;
  --text: #243027;
  --muted: #5d685f;
  --accent: #2f6b4f;
  --border: #d9ded8;
}

* { box-sizing: border-box; }
html { font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif; line-height: 1.75; }
body { margin: 0; background: var(--bg); color: var(--text); }
a { color: var(--accent); text-underline-offset: .18em; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.skip-link { position: absolute; left: -9999px; top: 8px; }
.skip-link:focus { left: 12px; z-index: 2; padding: 8px 12px; background: var(--card); }
header, main, footer { width: min(100% - 32px, 760px); margin-inline: auto; }
header { padding: 32px 0 16px; }
nav { display: flex; flex-wrap: wrap; gap: 16px; }
main { padding-bottom: 32px; }
h1 { font-size: clamp(1.8rem, 6vw, 2.5rem); line-height: 1.3; margin: 20px 0 8px; }
h2 { font-size: 1.25rem; line-height: 1.45; margin-top: 2rem; }
p, li { max-width: 68ch; }
.lead { color: var(--muted); font-size: 1.05rem; }
.card { padding: 18px 20px; margin: 20px 0; background: var(--card); border: 1px solid var(--border); border-radius: 14px; }
footer { padding: 20px 0 40px; color: var(--muted); border-top: 1px solid var(--border); }
@media (prefers-color-scheme: dark) {
  :root { --bg: #151a16; --card: #1d241f; --text: #edf3ee; --muted: #bdc8bf; --accent: #8ed0a8; --border: #3b463e; }
}