:root {
  --bg: #ffffff;
  --fg: #1c1c1e;
  --muted: #6b6b70;
  --accent: #d6336c;
  --card: #f5f5f7;
  --border: #e3e3e8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --fg: #f2f2f7;
    --muted: #a0a0a8;
    --accent: #ff6b9a;
    --card: #1c1c1f;
    --border: #2c2c31;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 32px 16px 64px; }
header.site {
  display: flex; flex-wrap: wrap; gap: 12px;
  align-items: center; justify-content: space-between;
  margin-bottom: 32px; padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
header.site a.brand { font-weight: 700; color: var(--fg); text-decoration: none; }
nav a { margin-left: 16px; }
nav a:first-child { margin-left: 0; }
a { color: var(--accent); }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 1.2rem; margin: 32px 0 8px; }
p.lead { color: var(--muted); margin-top: 0; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 16px 20px; margin: 16px 0; }
ul { padding-left: 20px; }
footer { margin-top: 48px; color: var(--muted); font-size: 0.9rem; }
.lang { border: 1px solid var(--border); background: transparent; color: var(--fg); border-radius: 8px; padding: 4px 10px; font: inherit; font-size: 0.9rem; cursor: pointer; }
html[data-lang="en"] [lang="it"], html[data-lang="it"] [lang="en"] { display: none; }