:root {
  color-scheme: light;
  --ink: #163026;
  --muted: #52645d;
  --paper: #f7fbf8;
  --surface: #ffffff;
  --line: #d6e5dc;
  --accent: #1f7a52;
  --accent-soft: #e5f4eb;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.65 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
main { max-width: 880px; margin: 0 auto; padding: 36px 20px 64px; }
header { margin-bottom: 28px; }
h1, h2 { line-height: 1.2; letter-spacing: -0.02em; }
h1 { font-size: clamp(2rem, 5vw, 3.2rem); margin: 0 0 12px; }
h2 { margin-top: 34px; font-size: 1.45rem; }
p, ul { max-width: 76ch; }
a { color: var(--accent); font-weight: 650; }
.meta { color: var(--muted); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 20px; margin: 18px 0; }
nav { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 28px; }
nav a { background: var(--accent-soft); border-radius: 999px; padding: 8px 14px; text-decoration: none; }
footer { color: var(--muted); border-top: 1px solid var(--line); margin-top: 40px; padding-top: 18px; font-size: .9rem; }
code { background: var(--accent-soft); border-radius: 4px; padding: 1px 4px; }
@media (prefers-color-scheme: dark) {
  :root { color-scheme: dark; --ink: #e4f2e9; --muted: #afc4b7; --paper: #0e1b15; --surface: #14251c; --line: #2c4a39; --accent: #8be0ad; --accent-soft: #1b3b2a; }
}