:root {
  --bg: #f8fafc;
  --fg: #0f172a;
  --muted: #475569;
  --accent: #2563eb;
  --card: #ffffff;
  --border: #e2e8f0;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}
.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 20px;
}
.header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}
.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand {
  font-weight: 700;
  font-size: 1.25rem;
}
.brand span { color: var(--accent); }
.nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 20px;
}
.nav a:hover { color: var(--accent); }
.main { padding: 48px 20px; }
.hero { margin-bottom: 40px; }
.hero h1 { font-size: 2rem; margin-bottom: 12px; }
.hero p { color: var(--muted); font-size: 1.1rem; }
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
}
.card h2 { font-size: 1.2rem; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 0.95rem; }
.footer {
  border-top: 1px solid var(--border);
  padding: 24px 20px;
  color: var(--muted);
  font-size: 0.9rem;
}