*{
    margin: 0;
    padding: 0;
}
body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}

ul {
    list-style: none; 
    padding: 0;     
    margin: 0;
}

header {
    background-color: #004080;
    color: white;
    text-align: center;
    padding: 20px;
}

section {
    background: white;
    margin: 20px auto;
    padding: 20px;
    width: 80%;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.menu-nav {
  display: flex;
  justify-content: flex-start;
  padding: 10px 20px;
}
.menu-nav select {
  appearance: none; /* Remueve la flecha por defecto del navegador */
  -webkit-appearance: none;
  -moz-appearance: none;
  
  background-color: #ffffff;
  color: #004080; /* Azul similar al tono de tu encabezado */
  font-size: 16px;
  font-weight: bold;
  padding: 10px 40px 10px 18px;
  border: 2px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  outline: none;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
  transition: all 0.3s ease;
  
  /* Flecha personalizada dibujada en SVG */
  background-image: url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23004080'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 20px;
}
.menu-nav select:hover {
  background-color: #f0f4f8;
  border-color: #4CAF50; /* Verde a juego con tus títulos */
  transform: translateY(-2px);
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.2);
}
.menu-nav select:focus {
  border-color: #4CAF50;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.3);
}
.menu-nav select option {
  background-color: #ffffff;
  color: #333333;
  padding: 10px;
  font-weight: normal;
}
.menu-nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

.menu-nav a {
    text-decoration: none;
    color: #ffffff;
    font-weight: 600;
    display: inline-block;
    padding: 5px 10px;
}
h2 {
    color:rgb(69, 157, 69);
}
/*diseño resposiuvo*/
@media(max-width:768px){
    .encabezado-principal{
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    .hero h2{
        font-size: 1.5rem;
    }
}
footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: #1a252f;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
}