:root {
  --bg: #f4f5f3; --ink: #17201c; --muted: #56615c; --line: #d6dbd8; --accent: #1f5fd1;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #121614; --ink: #e8edea; --muted: #9aa5a0; --line: #2b3330; --accent: #7ba6ff; color-scheme: dark; }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}
main {
  max-width: 640px; margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  padding-block: 48px 64px;
}
h1 { font-size: 32px; line-height: 1.15; margin: 0 0 8px; letter-spacing: -0.01em; }
h2 { font-size: 19px; margin: 32px 0 6px; }
p, li { color: var(--ink); }
.lede { color: var(--muted); margin-top: 0; }
a { color: var(--accent); }
nav { display: flex; gap: 16px; margin-top: 40px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 15px; }