:root {
  --azul: #007bff;
  --azul-oscuro: #0056b3;
  --azul-claro: #e9f2ff;
  --texto: #1d2028;
  --gris: #6c757d;
}

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

body {
  font-family: "Segoe UI", sans-serif;
  background: var(--azul-claro);
  color: var(--texto);
  line-height: 1.6;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--azul-oscuro);
  color: #fff;
  padding: 1rem 5%;
  position: sticky;
  top: 0;
  z-index: 1000;
}

nav .logo {
  font-size: 1.6rem;
  font-weight: bold;
  color: #fff;
  letter-spacing: 1px;
}

nav ul {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

nav a {
  color: #fff;
  text-decoration: none;
  transition: color 0.3s;
}

nav a:hover {
  color: var(--azul);
}

.hero {
  background: linear-gradient(135deg, var(--azul), var(--azul-oscuro));
  color: #fff;
  padding: 7rem 10% 6rem;
  text-align: center;
}

.hero h1 {
  font-size: 2.8rem;
  margin-bottom: 1rem;
}

.hero h1 span {
  color: var(--azul-oscuro);
  background: #fff;
  padding: 0 0.5rem;
  border-radius: 5px;
}

.hero p {
  max-width: 700px;
  margin: 0 auto 2rem;
  font-size: 1.2rem;
}

.section {
  padding: 4rem 10%;
  text-align: center;
}

.section h2 {
  font-size: 2rem;
  color: var(--azul-oscuro);
  margin-bottom: 2rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
}

.card {
  background: #fff;
  border-radius: 15px;
  padding: 2rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.card h3 {
  margin-bottom: 1rem;
  color: var(--azul-oscuro);
}

.card a {
  display: inline-block;
  margin-top: 1rem;
  background: var(--azul);
  color: #fff;
  text-decoration: none;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  transition: background 0.3s ease;
}

.card a:hover {
  background: var(--azul-oscuro);
}

.btn {
  background: var(--azul);
  color: #fff;
  text-decoration: none;
  padding: 0.9rem 1.8rem;
  border-radius: 10px;
  font-weight: bold;
  display: inline-block;
  transition: background 0.3s;
}

.btn:hover {
  background: var(--azul-oscuro);
}

footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--gris);
  font-size: 0.9rem;
  background: #fff;
  margin-top: 2rem;
}