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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f4f4f4;
}

/* Contenedor principal */
.container {
  max-width: 1200px;
  margin: 0 auto;
  background-color: white;
  min-height: 100vh;
}

/* Header */
header {
  background: #2980b9;
  color: white;
  padding: 2rem 0;
  text-align: center;
}

header h1 {
  font-size: 2.5rem;
  font-weight: 300;
  margin-bottom: 0.5rem;
}

header p {
  font-size: 1.1rem;
  opacity: 0.9;
}

/* Navegación */
nav {
  background-color: #2c3e50;
  padding: 1rem 0;
}

nav ul {
  list-style: none;
  text-align: center;
  max-width: 800px;
  margin: 0 auto; /* Centramos el contenedor */
}

nav li {
  display: inline-block; /* Aliniamos los elementos horizontalmente */
  margin: 0 15px;
}

nav a {
  color: white;
  text-decoration: none;
  padding: 10px 20px;
  border-radius: 25px;
  transition: all 0.3s ease;
  font-weight: 500;
  display: block;
}

nav a:hover {
  background-color: #3498db;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

nav a.active {
  background-color: #3498db;
}

/* Contenido principal */
main {
  padding: 2rem;
  min-height: 500px;
}

/* Columnas */
.columna-izq,
.columna-der {
  float: left;
  width: 50%;
  padding: 0 1rem;
}

.columna-izq {
  border-right: 2px solid #ecf0f1;
}

/* Estilos para el contenido de las columnas */
.columna-izq h2,
.columna-der h2 {
  color: #2c3e50;
  margin-bottom: 1rem;
  font-size: 1.8rem;
  border-bottom: 3px solid #3498db;
  padding-bottom: 0.5rem;
}

.columna-izq p,
.columna-der p {
  margin-bottom: 1rem;
  line-height: 1.8;
  color: #555;
}

/* Tarjetas de contenido */
.card {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  border-left: 4px solid #3498db;
}

.card h3 {
  color: #2c3e50;
  margin-bottom: 0.5rem;
  font-size: 1.3rem;
}

.card p {
  color: #666;
  margin-bottom: 1rem;
}

/* Botones */
.btn {
  display: inline-block;
  padding: 10px 20px;
  background-color: #3498db;
  color: white;
  text-decoration: none;
  border-radius: 5px;
  transition: all 0.3s ease;
  font-weight: 500;
}

.btn:hover {
  background-color: #2980b9;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

/* Clearfix para el main */
main::after {
  content: "";
  display: table;
  clear: both;
}

/* Footer */
footer {
  background-color: #2c3e50;
  color: white;
  text-align: center;
  padding: 2rem;
  margin-top: 2rem;
  clear: both;
}

footer p {
  margin: 0;
  opacity: 0.8;
}