:root {
  --bg: #ffffff;
  --text: #1d1f22;
  --muted: #5b6270;
  --accent: #0f8a85;
  --line: #e2e5ea;
  --code-bg: #f2f4f6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --text: #e8eaed;
    --muted: #a3a9b4;
    --accent: #3fd5c9;
    --line: #2c3036;
    --code-bg: #22262b;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Helvetica Neue", sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
header a { color: var(--text); text-decoration: none; font-weight: 700; font-size: 20px; }
nav.lang { font-size: 14px; color: var(--muted); margin-bottom: 24px; }
a { color: var(--accent); }
h1 { font-size: 28px; line-height: 1.3; margin: 24px 0 8px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
h3 { font-size: 17px; margin: 24px 0 4px; }
p, li { overflow-wrap: anywhere; }
.updated { color: var(--muted); font-size: 14px; }
code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; font-size: 0.92em; }
hr { border: none; border-top: 1px solid var(--line); margin: 48px 0; }
footer { color: var(--muted); font-size: 14px; margin-top: 48px; }