* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f8f9fa;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 20px;
}

h1 {
  text-align: center;
  margin-bottom: 40px;
  font-size: 2em;
  color: #343a40;
}

.nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  width: 100%;
  max-width: 800px;
}

.nav-card {
  background: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  text-align: center;
  text-decoration: none;
  color: #212529;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.nav-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 14px rgba(0,0,0,0.1);
}

.nav-card h2 {
  margin: 0 0 10px;
  font-size: 1.2em;
}

.nav-card p {
  font-size: 0.95em;
  color: #6c757d;
}

.footer {
  margin-top: 60px;
  font-size: 0.9em;
  color: #adb5bd;
}