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%;
}

.fb-share-btn {
  display: inline-flex;
  align-items: center;
  background-color: #1877F2;
  color: #fff;
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: bold;
  text-decoration: none;
  transition: all 0.3s ease;
}
.fb-share-btn:hover {
  background-color: #145dbf;
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(24, 119, 242, 0.4);
}

.slideshow-container {
  position: relative;
  width: 100%;
  max-width: 480px;
  height: 320px;           /* hauteur fixe */
  margin: 20px auto;
  overflow: hidden;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  background: #fff;        /* couleur de fond pour bandes */
}

.mySlides {
  display: none;
  width: 100%;
  height: 100%;
  text-align: center;      /* centre horizontalement */
  line-height: 320px;      /* centre verticalement pour inline-block */
}

.mySlides img {
  max-height: 100%;        /* hauteur limitée à 320px */
  max-width: 100%;         /* largeur max à 100% */
  vertical-align: middle;  /* aligne au centre vertical */
  display: inline-block;
}