:root {
  --bg: #070b14;
  --card: #121826;
  --text: #e8eefc;
  --muted: #9aa7c2;
  --cyan: #5ee1f5;
  --line: rgba(94, 225, 245, 0.22);
  --max: 44rem;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  background: radial-gradient(1200px 600px at 10% -10%, #12304a 0%, var(--bg) 55%);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
a { color: var(--cyan); }
header, main, footer { max-width: var(--max); margin: 0 auto; padding: 1.25rem 1.25rem; }
header {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  align-items: baseline;
  border-bottom: 1px solid var(--line);
}
header strong { font-size: 1.15rem; }
nav { display: flex; flex-wrap: wrap; gap: 0.75rem 1rem; }
nav a { text-decoration: none; color: var(--muted); }
nav a[aria-current="page"], nav a:hover { color: var(--cyan); }
h1, h2 { line-height: 1.25; }
h1 { font-size: 1.8rem; margin: 0.2rem 0 1rem; }
h2 { font-size: 1.15rem; margin-top: 1.8rem; }
p, li { color: var(--text); }
.muted, footer { color: var(--muted); font-size: 0.92rem; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem 1.1rem;
}
ul { padding-left: 1.2rem; }
footer { border-top: 1px solid var(--line); margin-top: 2rem; }
code { font-size: 0.92em; }
hr.lang { border: 0; border-top: 1px solid var(--line); margin: 2.6rem 0; }
.lang-switch { color: var(--muted); font-size: 0.95rem; margin: 0 0 1.2rem; }