:root {
  color-scheme: light dark;
  --bg: #f8f7f2;
  --surface: #ffffff;
  --text: #202124;
  --muted: #5f6368;
  --border: #dedbd2;
  --accent: #1f6feb;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
main {
  width: min(880px, calc(100% - 40px));
  margin: 0 auto;
  padding: 56px 0 72px;
}
header {
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
  padding-bottom: 24px;
}
nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 18px;
}
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
h1 { margin: 0 0 8px; font-size: clamp(32px, 5vw, 52px); line-height: 1.1; }
h2 { margin: 34px 0 10px; font-size: 24px; line-height: 1.25; }
h3 { margin: 22px 0 8px; font-size: 18px; }
p, li { font-size: 16px; }
ul { padding-left: 22px; }
.lead { font-size: 19px; color: var(--muted); max-width: 720px; }
.meta { color: var(--muted); font-size: 14px; }
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 22px;
  margin: 22px 0;
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 26px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px;
}
.card h2 { margin-top: 0; font-size: 20px; }
footer {
  border-top: 1px solid var(--border);
  margin-top: 40px;
  padding-top: 22px;
  color: var(--muted);
  font-size: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141414;
    --surface: #1e1f21;
    --text: #f2f2f2;
    --muted: #b6b6b6;
    --border: #33363a;
    --accent: #7db1ff;
  }
}