:root {
  --bg: #ffffff;
  --text: #12302d;
  --muted: #4d6764;
  --accent: #0f766e;
  --spark: #f59e0b;
  --panel: #f0faf8;
  --border: #d5e7e4;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1716;
    --text: #e3efed;
    --muted: #a3b9b6;
    --accent: #3cc4b4;
    --panel: #142321;
    --border: #24403c;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 "Segoe UI", system-ui, -apple-system, sans-serif;
}
header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header { display: flex; align-items: center; gap: 12px; padding-top: 28px; padding-bottom: 8px; }
header img { width: 40px; height: 40px; }
header a { color: var(--text); text-decoration: none; font-weight: 700; font-size: 20px; }
nav { margin-left: auto; display: flex; gap: 16px; font-size: 15px; }
nav a { font-weight: 500; font-size: 15px; color: var(--muted); }
h1 { font-size: 34px; line-height: 1.2; margin: 32px 0 8px; }
h2 { font-size: 23px; margin: 36px 0 8px; }
h3 { font-size: 18px; margin: 24px 0 4px; }
a { color: var(--accent); }
p.lead { font-size: 19px; color: var(--muted); margin-top: 0; }
.note { background: var(--panel); border-left: 4px solid var(--spark); padding: 12px 16px; border-radius: 6px; }
.card { display: flex; gap: 16px; align-items: center; background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.card img { width: 64px; height: 64px; flex: none; }
ol li, ul li { margin: 4px 0; }
code { background: var(--panel); padding: 1px 5px; border-radius: 4px; }
footer { color: var(--muted); font-size: 14px; border-top: 1px solid var(--border); margin-top: 48px; padding-top: 16px; padding-bottom: 32px; }
@media (max-width: 520px) { nav { display: none; } h1 { font-size: 28px; } }