input:invalid {
  border: 2px solid #e74c3c; /* Rouge clair */
  background-color: #ff9c9c;
}

input:valid {
  border: 2px solid #2ecc71; /* Vert */
  background-color: #f8fff9;
}
/* Style de base : le bouton est visible */
button[type="submit"] {
  visibility: visible;
  opacity: 1;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

/* Rendre le bouton invisible si l’email est vide ou invalide */
form:invalid button[type="submit"] {
  visibility: hidden;
  opacity: 0;
}

.video-container {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 ratio */
  height: 0;
  overflow: hidden;
  max-width: 100%;
}

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