:root {
  --bg: #F6F6F3; --surface: #FFFFFF; --text: #14171C; --muted: #5B6472; --accent: #1F5F8B; --trace: #D6006E;
  --line: #E3E3DE;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0E1116; --surface: #1A1F27; --text: #F2F4F7; --muted: #A7B0BE; --accent: #5AA9E6; --trace: #FF3D9A;
    --line: #2A313C; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; gap: 20px; align-items: center; margin-bottom: 8px; }
header img { width: 88px; height: 88px; border-radius: 20px; flex: none; }
h1 { font-size: 30px; line-height: 1.2; margin: 0 0 6px; letter-spacing: -0.01em; }
.tagline { margin: 0; color: var(--muted); }
nav { display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 24px 0 8px; padding: 12px 0;
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
nav a, .languages a { color: var(--accent); text-decoration: none; font-weight: 600; }
.languages { margin: 0 0 16px; color: var(--muted); font-size: 15px; }
.languages a[aria-current] { color: var(--text); }
section { background: var(--surface); border-radius: 16px; padding: 20px 22px; margin-top: 20px; }
h2 { font-size: 22px; margin: 0 0 12px; }
h3 { font-size: 17px; margin: 20px 0 6px; }
ul { padding-left: 20px; margin: 6px 0; }
li { margin: 6px 0; }
a { color: var(--accent); }
.note { border-left: 4px solid var(--trace); padding-left: 14px; }
details { border-top: 1px solid var(--line); padding: 10px 0; }
summary { cursor: pointer; font-weight: 600; }
footer { margin-top: 32px; color: var(--muted); font-size: 14px; }
@media (max-width: 480px) { header img { width: 64px; height: 64px; border-radius: 15px; } h1 { font-size: 24px; } }