:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #15181d;
  --muted: #5d6573;
  --line: #e2e5ea;
  --accent: #2f6bff;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1013;
    --surface: #171a1f;
    --ink: #eef0f3;
    --muted: #a0a7b3;
    --line: #262a31;
    --accent: #6d97ff;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); text-underline-offset: 3px; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header { border-bottom: 1px solid var(--line); background: var(--surface); }
header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 16px; padding-bottom: 16px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; font-size: 1.1rem; letter-spacing: -0.02em; }
.brand img { width: 30px; height: 30px; border-radius: 7px; }
nav { display: flex; gap: 18px; font-size: 0.92rem; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover, nav a[aria-current="page"] { color: var(--ink); }
main { padding: 48px 0 72px; }
h1 { margin: 0 0 8px; font-size: clamp(2rem, 6vw, 2.8rem); line-height: 1.1; letter-spacing: -0.035em; }
h2 { margin: 40px 0 10px; font-size: 1.25rem; letter-spacing: -0.02em; }
p, li { color: var(--muted); }
strong { color: var(--ink); }
ul { padding-left: 1.2rem; }
.updated { margin-bottom: 28px; font-size: 0.9rem; }
.card { margin: 24px 0; padding: 20px 22px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); }
.card p:last-child { margin-bottom: 0; }
footer { border-top: 1px solid var(--line); padding: 24px 0 40px; font-size: 0.85rem; color: var(--muted); }