:root {
  --bg: #fbfbf9; --fg: #1d1d1f; --muted: #6e6e73; --line: #e6e4df; --accent: #2f5d50;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #161615; --fg: #ecebe7; --muted: #9b9a95; --line: #2c2b29; --accent: #8fc1b0; }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--fg); }
body {
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
main { max-width: 640px; margin: 0 auto; padding: 96px 24px 64px; }
header { margin-bottom: 56px; }
.mark { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: -0.01em; }
.mark svg { width: 22px; height: 22px; }
h1 { font-size: 40px; line-height: 1.15; letter-spacing: -0.025em; font-weight: 600; margin: 28px 0 16px; }
h2 { font-size: 20px; letter-spacing: -0.01em; font-weight: 600; margin: 40px 0 8px; }
p, li { color: var(--fg); }
.lead { font-size: 20px; color: var(--muted); }
.muted { color: var(--muted); }
a { color: var(--accent); text-underline-offset: 3px; }
ul { padding-left: 20px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 56px 0 24px; }
footer { font-size: 14px; color: var(--muted); display: flex; gap: 20px; flex-wrap: wrap; }
.lang { margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--line); }
@media (max-width: 520px) { main { padding-top: 56px; } h1 { font-size: 32px; } }