:root {
  color-scheme: light dark;
  --text: #1f2933;
  --muted: #616e7c;
  --bg: #ffffff;
  --link: #0b6bcb;
  --rule: #e4e7eb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #e4e7eb;
    --muted: #9aa5b1;
    --bg: #12161b;
    --link: #6cb4ff;
    --rule: #2a3038;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}
header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-bottom: 20px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--rule);
}
header img { border-radius: 12px; flex-shrink: 0; }
h1 { font-size: 1.75rem; line-height: 1.2; margin: 0; }
h2 { font-size: 1.2rem; margin: 2em 0 0.5em; }
h3 { font-size: 1rem; margin: 1.4em 0 0.3em; }
.meta { color: var(--muted); margin: 4px 0 0; font-size: 0.9rem; }
ul, ol { padding-left: 1.3em; }
li { margin: 0.3em 0; }
a { color: var(--link); }
code { font-size: 0.9em; }
.contact { padding: 12px 16px; border-left: 3px solid var(--link); }
.back { margin-top: 2.5em; }