:root {
  --primary-color: #0a2f5c;
  --dark-color: #081f3d;
  --light-color: #f4f6f9;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
}

body { color: #333; }

.container {
  max-width: 1200px;
  margin: auto;
  padding: 0 1.5rem;
}

.header {
  background: var(--primary-color);
  color: #fff;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.nav a {
  color: #fff;
  margin-left: 1rem;
  text-decoration: none;
  font-weight: bold;
}

.banner {
  background: linear-gradient(rgba(0,0,0,.5), rgba(0,0,0,.5)),
              url('../img/banner-tridente.jpg');
  background-size: cover;
  background-position: center;
  color: #fff;
  text-align: center;
  padding: 5rem 1.5rem;
}

.section { padding: 4rem 0; }

.bg-light { background: var(--light-color); }

h3 {
  text-align: center;
  margin-bottom: 2rem;
  color: var(--primary-color);
}

.center-text {
  text-align: center;
  max-width: 700px;
  margin: auto;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px,1fr));
  gap: 1.5rem;
}

.card {
  background: #fff;
  padding: 2rem;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 4px 10px rgba(0,0,0,.08);
}

.btn-primary {
  display: inline-block;
  margin-top: 1.5rem;
  background: var(--primary-color);
  color: #fff;
  padding: .8rem 1.6rem;
  border-radius: 30px;
  text-decoration: none;
}

.footer {
  background: var(--dark-color);
  color: #fff;
  text-align: center;
  padding: 1.5rem;
}

@media (max-width: 768px) {
  .header-content { flex-direction: column; }
}