:root { --bg: #fafaf8; --text: #1d1d1b; --muted: #5c5c57; --line: #e3e3de; --accent: #2f5d50; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #161615; --text: #ececea; --muted: #a3a39e; --line: #2c2c2a; --accent: #8cc4b2; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
       font: 17px/1.65 system-ui, -apple-system, "Segoe UI", sans-serif; }
main { max-width: 42rem; margin: 0 auto; padding: 4rem 1.25rem 3rem; }
h1 { font-size: 1.9rem; line-height: 1.2; margin: 0 0 .5rem; letter-spacing: -.01em; }
h2 { font-size: 1.1rem; margin: 2.2rem 0 .4rem; }
p, li { color: var(--text); }
.lead { color: var(--muted); font-size: 1.05rem; margin-bottom: 2rem; }
ul { padding-left: 1.2rem; }
a { color: var(--accent); }
footer { border-top: 1px solid var(--line); margin-top: 3rem; padding-top: 1rem; color: var(--muted); font-size: .9rem; }