:root {
  color-scheme: light dark;
  --background: #f7f8f3;
  --surface: #ffffff;
  --text: #203a32;
  --muted: #53685f;
  --line: #dbe3dc;
  --accent: #176447;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-text-size-adjust: 100%;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--background); color: var(--text); font-size: 17px; line-height: 1.8; }
main { max-width: 800px; margin: auto; padding: 48px 24px 64px; }
header { margin-bottom: 32px; }
.brand { color: var(--muted); font-size: 13px; letter-spacing: .25em; }
h1 { margin: 12px 0 20px; font-size: clamp(28px, 6vw, 36px); line-height: 1.35; }
h1 span { font-weight: 500; }
h2 { margin: 0 0 16px; font-size: 25px; }
h3 { margin: 26px 0 8px; font-size: 19px; line-height: 1.6; }
p { margin: 10px 0; }
a { color: var(--accent); text-underline-offset: 4px; overflow-wrap: anywhere; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; border-radius: 3px; }
nav { display: flex; flex-wrap: wrap; gap: 4px 24px; }
nav a { display: inline-flex; align-items: center; min-height: 44px; }
section { margin: 24px 0; padding: 28px 32px; background: var(--surface); border: 1px solid var(--line); border-radius: 20px; scroll-margin-top: 20px; }
li { margin: 8px 0; padding-left: 4px; }
ol { padding-left: 24px; }
footer { margin-top: 30px; color: var(--muted); font-size: 14px; }
footer a { display: inline-block; padding: 10px 0; }
@media (max-width: 500px) {
  main { padding: 28px 16px 40px; }
  section { padding: 22px 20px; }
}
@media (prefers-color-scheme: dark) {
  :root { --background: #14221d; --surface: #1c2d25; --text: #e4eee7; --muted: #b8cbbd; --line: #395045; --accent: #90d6ae; }
}