:root { --bg:#ffffff; --fg:#1a1a1a; --muted:#5a5a5a; --accent:#1f5f3f; --rule:#e3e3e3; --card:#f6f6f4; }
@media (prefers-color-scheme: dark) {
  :root { --bg:#111311; --fg:#ececec; --muted:#a8a8a8; --accent:#8fd3ad; --rule:#2a2d2a; --card:#1a1d1a; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin:0; background:var(--bg); color:var(--fg); font:17px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,Ubuntu,sans-serif; }
main, header, footer { max-width: 44rem; margin: 0 auto; padding: 0 16px; }
header { padding-top: 28px; display:flex; align-items:baseline; justify-content:space-between; flex-wrap:wrap; gap:8px 20px; }
header a.brand { font-weight:700; font-size:1.25rem; color:var(--fg); text-decoration:none; letter-spacing:.02em; }
header nav a { color:var(--muted); text-decoration:none; margin-left:18px; }
header nav a:hover, a:hover { text-decoration: underline; }
a { color: var(--accent); }
h1 { font-size: clamp(1.9rem, 5vw, 2.6rem); line-height:1.15; margin: 44px 0 12px; }
h2 { font-size: 1.3rem; margin: 36px 0 8px; }
p.lede { font-size: 1.15rem; color: var(--muted); margin-top: 0; }
.promise { background: var(--card); border: 1px solid var(--rule); border-radius: 10px; padding: 16px 18px; margin: 28px 0; }
.promise strong { color: var(--accent); }
ul { padding-left: 1.2rem; }
li { margin: 6px 0; }
code { font: 0.95em ui-monospace, SFMono-Regular, Consolas, monospace; background: var(--card); padding: 1px 5px; border-radius: 4px; }
footer { margin-top: 64px; padding-top: 18px; padding-bottom: 40px; border-top: 1px solid var(--rule); color: var(--muted); font-size: .95rem; }
footer p { margin: 6px 0; }