:root {
  --azul-principal: #003366;
  --azul-secundario: #0055A4;
  --cinza-claro: #f5f7fa;
  --branco: #ffffff;
  --texto: #333;
}
body {
  font-family: "Segoe UI", Arial;
  margin: 0;
  background: var(--cinza-claro);
  color: var(--texto);
}

header {
  background: var(--azul-principal);
  color: white;
  padding: 15px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav a {
  color: white;
  margin-left: 20px;
  text-decoration: none;
  font-weight: 500;
}

.hero {
  background: linear-gradient(to right, #003366, #0055A4);
  color: white;
  padding: 60px;
  text-align: center;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  padding: 40px;
  gap: 20px;
}

.card {
  background: white;
  padding: 25px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}