:root {
  --transition-speed-fast: 0.3s;
  --transition-speed-medium: 0.6s;
  --transition-speed-slow: 0.9s;
  --transition-easing: ease-in-out;
}

body {
  overflow-x: hidden; /* Empêche la barre de scroll horizontale causée par les animations */
}

/* Transitions douces pour les liens et boutons */
a, button, .btn {
  transition: all var(--transition-speed-fast) var(--transition-easing);
}

/* --- 2. Animations au chargement de la page (Section Billboard) --- */

/* On définit les animations une seule fois */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Application des animations aux éléments de la première section */
#billboard h6 {
  animation: fadeIn 1s var(--transition-easing) forwards;
}

#billboard h2 {
  animation: fadeInUp 1s var(--transition-easing) 0.2s forwards; /* 0.2s de délai */
  opacity: 0; /* État initial caché */
}

#billboard .info li {
  animation: fadeInUp 1s var(--transition-easing) forwards;
  opacity: 0; /* État initial caché */
}

/* Apparition décalée pour chaque point de la liste */
#billboard .info li:nth-child(1) { animation-delay: 0.4s; }
#billboard .info li:nth-child(2) { animation-delay: 0.6s; }
#billboard .info li:nth-child(3) { animation-delay: 0.8s; }

#billboard .btn {
  animation: fadeInUp 1s var(--transition-easing) 1s forwards;
  opacity: 0; /* État initial caché */
}


/* --- 3. Configuration des animations au scroll --- */

/* Classe de préparation pour tous les éléments qui s'animeront au scroll */
.animate-on-scroll {
  opacity: 0;
  transition: opacity var(--transition-speed-medium) var(--transition-easing), transform var(--transition-speed-medium) var(--transition-easing);
}

/* Différents types d'animation */
.animate-on-scroll.fade-in-up {
  transform: translateY(50px);
}

.animate-on-scroll.fade-in-left {
  transform: translateX(-50px);
}

.animate-on-scroll.fade-in-right {
  transform: translateX(50px);
}

.animate-on-scroll.zoom-in {
  transform: scale(0.9);
}


/* Classe 'visible' qui sera ajoutée par JavaScript pour déclencher l'animation */
.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translate(0, 0) scale(1);
}

/* --- 4. Améliorations des transitions (Hovers) --- */

/* Boutons */
.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

/* Cartes (Blog, Projets) */
.card-item, .project-content {
  transition: transform var(--transition-speed-fast) var(--transition-easing), box-shadow var(--transition-speed-fast) var(--transition-easing);
}

.card-item:hover, .project-content:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.card-item .post-image, .project-content .portfolio-img {
    transition: transform var(--transition-speed-medium) var(--transition-easing);
}

.card-item:hover .post-image, .project-content:hover .portfolio-img {
    transform: scale(1.05);
}

/* Liens du menu */
.navbar-nav .nav-link {
  position: relative;
  padding-bottom: 5px;
}

.navbar-nav .nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--bs-primary); /* Utilise la couleur primaire de Bootstrap */
  transition: width var(--transition-speed-fast) var(--transition-easing);
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
  width: 100%;
}

/* Blocs de service */
.service-block .service-bg {
    transition: transform var(--transition-speed-slow) var(--transition-easing);
}

.service-block:hover .service-bg {
    transform: scale(1.05); /* Effet de zoom léger */
}

.service-block .service-btn {
    transition: all var(--transition-speed-fast) var(--transition-easing);
}

.service-block:hover .service-btn {
    background-color: var(--bs-primary);
    color: white;
    border-color: var(--bs-primary);
}