@charset "utf-8";
/* CSS Document */

.iframe-container, .video-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  overflow: hidden;
  margin-bottom: 1rem;
}

.iframe-container iframe, .video-container iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Roboto', sans-serif;
  background: #f9f9f9;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column; /* menú vertical en móvil */
  gap: 0.5rem;
}

nav ul li a {
  text-decoration: none;
  padding: 0.5rem 1rem;
  background: #007acc;
  color: white;
  border-radius: 5px;
  display: block;
}
@media (min-width: 768px) {
  nav ul {
    flex-direction: row; 
    justify-content: center;
  }

  nav ul li a {
    margin: 0 1rem;
  }

  section {
    display: flex;
    gap: 2rem;
  }

 article {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  }

  aside {
    flex: 1;
    background: #eee;
    padding: 1rem;
    border-radius: 8px;
  }
  section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
  }
  aside:empty {
  display: none;
  }