:root {
  --bg: #ffffff;
  --text: #1c1d21;
  --muted: #5b5f6b;
  --accent: #1a5fb4;
  --card: #f3f5f9;
  --line: #e1e5ee;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121316;
    --text: #e8e9ee;
    --muted: #a3a7b3;
    --accent: #8ab4f8;
    --card: #1c1e23;
    --line: #2c2f37;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main, header, footer { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header { display: flex; align-items: center; justify-content: space-between; padding-top: 20px; }
.logo { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 20px; }
.logo img { width: 36px; height: 36px; border-radius: 9px; }
nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
h1 { font-size: 30px; line-height: 1.25; margin: 40px 0 8px; }
h2 { font-size: 21px; margin: 32px 0 6px; }
p, li { color: var(--text); }
.lead { color: var(--muted); font-size: 19px; margin-top: 0; }
.muted { color: var(--muted); font-size: 15px; }
a { color: var(--accent); }
.card {
  display: flex; gap: 16px; align-items: center;
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 16px; margin: 24px 0;
}
.card img { width: 64px; height: 64px; border-radius: 14px; flex: none; }
.card h2 { margin: 0; font-size: 19px; }
.card p { margin: 4px 0 0; color: var(--muted); }
.summary { background: var(--card); border-left: 4px solid var(--accent); border-radius: 8px; padding: 12px 16px; }
footer { margin-top: 48px; padding-bottom: 32px; border-top: 1px solid var(--line); padding-top: 16px; }
footer p { color: var(--muted); font-size: 14px; margin: 4px 0; }