/* Reset básico */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body, html {
    height: 100%;
    width: 100%;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    overflow: hidden;
    background-color: white; /* Fallback si imagen no carga */
  }
  
  /* Contenedor general */
  .contenedor {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    text-align: center;
    color: white;
    padding: 40px;
    z-index: 1;
  }
  
  /* Fondo de video */
  .fondo-video {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    object-fit: cover;
    z-index: -1;
  }
  
  /* Logo institucional */
  .logo {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 120px;
  }
  
  /* Título principal "ALQUIMIA MENTAL" */
  .titulo {
    position: absolute;
    top: 25%;
    left: 10%;
    color: #6A0DAD; /* Morado brillante */
    font-size: 4em;
    font-weight: 900;
    text-shadow: 2px 2px 5px #fff, -2px -2px 5px #000;
    line-height: 1.1;
    text-align: center;
    letter-spacing: 2px;
  }
  
  /* Caja de texto informativa */
  .texto-info {
    position: absolute;
    top: 20%;
    right: 5%;
    width: 35%;
    background-color: rgba(0, 0, 0, 0.7);
    padding: 25px;
    border-radius: 15px;
    color: #fff;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.6);
  }
  
  .texto-info h3 {
    font-size: 1.2em;
    margin-bottom: 12px;
    color: #ffffff;
    font-weight: bold;
    line-height: 1.5;
  }
  
  .texto-info p {
    font-size: 1em;
    line-height: 1.6;
    color: #e0e0e0;
  }
  
  /* Botón de acción */
  .boton {
    position: absolute;
    bottom: 10%;
    right: 5%;
    background: #000;
    color: #fff;
    padding: 15px 35px;
    border-radius: 50px;
    font-size: 1em;
    font-weight: bold;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  }
  
  .boton:hover {
    background-color: #444;
    transform: scale(1.05);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.5);
  }
  
  /* Menú hamburguesa */
  .menu-container {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 10;
  }
  
  .menu-icon {
    font-size: 2em;
    color: white;
    cursor: pointer;
    user-select: none;
    background: rgba(0, 0, 0, 0.6);
    padding: 10px 15px;
    border-radius: 8px;
    transition: background 0.3s;
  }
  
  .menu-icon:hover {
    background: rgba(0, 0, 0, 0.8);
  }
  
  #menu-toggle {
    display: none;
  }
  
  .menu {
    position: absolute;
    top: 60px;
    right: 0;
    background: rgba(0, 0, 0, 0.95);
    border-radius: 10px 0 0 10px;
    width: 220px;
    display: none;
    flex-direction: column;
    padding: 20px;
  }
  
  .menu ul {
    list-style: none;
    padding: 0;
  }
  
  .menu ul li {
    margin-bottom: 15px;
  }
  
  .menu ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.2s;
  }
  
  .menu ul li a:hover {
    color: #9f82ec;
  }
  
  /* Mostrar menú al activar toggle */
  #menu-toggle:checked ~ .menu {
    display: flex;
  }
  
  /* Secciones */
  .seccion {
    padding: 80px 20px;
    background: rgba(255, 255, 255, 0.95);
    color: #222;
    margin: 30px auto;
    max-width: 900px;
    border-radius: 15px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(5px);
  }
  
  .seccion h2 {
    font-size: 2em;
    margin-bottom: 15px;
    color: #6A0DAD;
  }
  
  .seccion p {
    font-size: 1.1em;
    line-height: 1.6;
  }