.header-blue {
  background: linear-gradient(135deg, #172a74, #21a9af);
  background-color: black;
  padding-bottom: 80px;
  font-family: 'Source Sans Pro', sans-serif;
  overflow: hidden;
  background-image: url('../img/toile3.jpg');
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  
  /* Ajout de l'animation */
  animation: zoomEffect 10s infinite alternate;
}

/* Animation de zoom */
@keyframes zoomEffect {
  0% {
    background-size: 120%; /* Taille initiale */
  }
  50% {
    background-size: 150%; /* Zoom */
  }
  100% {
    background-size: 120%; /* Retour à la taille initiale */
  }
}


@media (min-width:768px) {
  .header-blue {
    padding-bottom: 120px;
  }
}

.header-blue .navbar {
  background: rgba(0, 0, 0, 0.555);
  padding-top: .75rem;
  padding-bottom: .75rem;
  color: #fff;
  border-radius: 0;
  box-shadow: none;
  border: none;
}

@media (min-width:768px) {
  .header-blue .navbar {
    padding-top: 1rem;
    padding-bottom: 1rem;
  }
}

.header-blue .navbar .navbar-brand {
  font-weight: bold;
  color: inherit;
}

.header-blue .navbar .navbar-brand:hover {
  color: #f0f0f0;
}

.header-blue .navbar .navbar-collapse {
  border-top: 1px solid rgba(255,255,255,0.3);
  margin-top: .5rem;
}

@media (min-width:768px) {
  .header-blue .navbar .navbar-collapse {
    border-color: transparent;
    margin: 0;
  }
}

.header-blue .navbar .navbar-toggler {
  border-color: rgba(255,255,255,0.3);
}

.header-blue .navbar .navbar-toggler:hover, .header-blue .navbar-toggler:focus {
  background: none;
}

.header-blue .navbar .navbar-nav a.active, .header-blue .navbar .navbar-nav > .show .dropdown-item {
  background: none;
  box-shadow: none;
}

@media (min-width: 768px) {
  .header-blue .navbar-nav .nav-link {
    padding-left: .7rem;
    padding-right: .7rem;
  }
}

@media (min-width: 992px) {
  .header-blue .navbar-nav .nav-link {
    padding-left: 1.2rem;
    padding-right: 1.2rem;
  }
}

.header-blue .action-button, .header-blue .action-button:not(.disabled):active {
  border: 1px solid rgba(255,255,255,0.7);
  border-radius: 40px;
  color: #ebeff1;
  box-shadow: none;
  text-shadow: none;
  padding: .3rem .8rem;
  background: transparent;
  transition: background-color 0.25s;
  outline: none;
}

.header-blue .action-button:hover {
  color: #fff;
}

.header-blue .hero {
  text-align: center;
  padding-bottom: 10vh;

}

@media (min-width:768px) {
  .header-blue .hero {
    margin-top: 60px;
    text-align: left;
  }
}

.header-blue .hero h1 {
  color: #fff;
  font-size: 40px;
  margin-top: 0;
  margin-bottom: 15px;
  font-weight: 300;
  line-height: 1.4;
}

@media (min-width:992px) {
  .header-blue .hero h1 {
    margin-top: 190px;
    margin-bottom: 24px;
    line-height: 1.2;
  }
}

.header-blue .hero p {
  color: rgba(255,255,255,0.8);
  font-size: 20px;
  margin-bottom: 30px;
  font-weight: 300;
}

.header-blue .phone-holder {
  text-align: right;
}

.header-blue div.iphone-mockup {
  position: relative;
  max-width: 300px;
  margin: 20px;
  display: inline-block;
}

.header-blue .iphone-mockup img.device {
  width: 100%;
  height: auto;
}

.header-blue .iphone-mockup .screen {
  position: absolute;
  width: 88%;
  height: 77%;
  top: 12%;
  border-radius: 2px;
  left: 6%;
  border: 1px solid #444;
  background-color: #aaa;
  overflow: hidden;
  background: url(screen-content-iphone-6.jpg);
  background-size: cover;
  background-position: center;
}

.header-blue .iphone-mockup .screen:before {
  content: '';
  background-color: #fff;
  position: absolute;
  width: 70%;
  height: 140%;
  top: -12%;
  right: -60%;
  transform: rotate(-19deg);
  opacity: 0.2;
}