* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f0f2f5;
  color: #333;
  line-height: 1.6;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px;
  text-align: center;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

h1 {
  font-size: 32px;
  color: #003399;
  margin-bottom: 30px;
}

.nav-cards {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 40px 30px;
  width: 320px;
  text-decoration: none;
  color: #333;
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.12);
}

.card-icon {
  font-size: 48px;
  margin-bottom: 15px;
}

.card h2 {
  font-size: 20px;
  color: #003399;
  margin-bottom: 8px;
}

.card p {
  font-size: 14px;
  color: #666;
}

.btn-back {
  display: inline-block;
  padding: 8px 20px;
  background: #eee;
  color: #333;
  text-decoration: none;
  border-radius: 4px;
  font-size: 14px;
  transition: background 0.2s;
}

.btn-back:hover { background: #ddd; }