:root {
  color-scheme: light dark;
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1c1e21;
  --muted: #5c6470;
  --accent: #3a6ea5;
  --border: #e3e6ea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --card: #1d2026;
    --text: #e8eaed;
    --muted: #9aa3af;
    --accent: #8ab4dd;
    --border: #2b2f36;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
main {
  max-width: 44rem;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}
h1 { font-size: 1.8rem; margin: 0 0 0.25rem; }
h2 { font-size: 1.25rem; margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--border); }
h3 { font-size: 1rem; margin-top: 1.5rem; }
p, li { color: var(--text); }
.muted { color: var(--muted); font-size: 0.9rem; }
a { color: var(--accent); }
nav.langs {
  margin: 1.25rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.9rem;
  font-size: 0.9rem;
}
nav.langs a { text-decoration: none; }
nav.langs a:hover { text-decoration: underline; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin: 1rem 0;
}
header.site {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
header.site .logo {
  width: 44px; height: 44px;
  border-radius: 10px;
  background: linear-gradient(160deg, #7fa8cc, #3a6ea5);
  display: grid; place-items: center;
  color: #fff; font-size: 1.4rem; font-weight: 700;
  flex-shrink: 0;
}
footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}