:root {
  color-scheme: light;
  --bg: #f8fafc;
  --text: #0f172a;
  --muted: #475569;
  --brand: #1d4ed8;
  --card: #ffffff;
  --border: #dbeafe;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, Segoe UI, Roboto, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 1.25rem;
}
h1, h2 { line-height: 1.2; }
.tagline { color: var(--muted); font-size: 1.1rem; }
nav { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: .5rem; }
nav a { color: var(--brand); text-decoration: none; font-weight: 600; }
nav a:hover { text-decoration: underline; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(2, 6, 23, .04);
}
footer { color: var(--muted); font-size: .95rem; }