:root {
  --bg: #ffffff;
  --surface: #f5f7fb;
  --text: #0f172a;
  --muted: #475569;
  --primary: #2563eb;
  --border: #e2e8f0;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --surface: #131c2e;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --primary: #60a5fa;
    --border: #1e293b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

a { color: var(--primary); }

header, main, footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 16px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  padding-bottom: 20px;
}

header nav { display: flex; gap: 16px; }
header nav a { color: var(--muted); text-decoration: none; }
.brand { font-weight: 800; font-size: 20px; color: var(--text); text-decoration: none; }

main { padding-bottom: 48px; }
h1 { font-size: 34px; line-height: 1.2; margin: 24px 0 8px; }
h2 { font-size: 22px; margin: 36px 0 8px; }
h3 { font-size: 18px; margin: 24px 0 4px; }
.lead { font-size: 20px; color: var(--muted); }
.meta { color: var(--muted); font-size: 15px; }

.cards { display: grid; gap: 12px; margin: 28px 0; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 16px 18px; }
.card h3 { margin-top: 0; }
.card p { margin: 0; color: var(--muted); }

table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 8px 6px; border-bottom: 1px solid var(--border); }
.table-wrap { overflow-x: auto; }

footer { border-top: 1px solid var(--border); padding-top: 20px; padding-bottom: 40px; color: var(--muted); font-size: 15px; }
footer a { color: var(--muted); }