body {
  margin: 0;
  font-family: Arial, sans-serif;
}

.site-header, .site-footer {
  background: #0A1A2F;
  color: #fff;
  padding: 1rem;
}

nav a {
  color: #fff;
  margin-right: 1rem;
  text-decoration: none;
}

.hero {
  min-height: 70vh;
  background:
    linear-gradient(rgba(10,26,47,0.6), rgba(10,26,47,0.6)),
    url("../images/hero.png") center / 70% no-repeat;
  display: flex;
  align-items: center;
  padding: 3rem;
  color: #fff;
}

.hero-content {
  max-width: 600px;
}

.btn {
  background: #1976D2;
  color: #fff;
  padding: 0.75rem 1.5rem;
  text-decoration: none;
  border-radius: 6px;
}

.categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  padding: 2rem;
  gap: 1rem;
}