/* --- Boutons Modernisés --- */
.btn-modern-primary {
  background: var(--gradient-primary);
  color: #ffffff !important;
  font-family: var(--font-heading);
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  border: none;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  cursor: pointer;
}

.btn-modern-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-primary);
  background: var(--primary-600);
}

.btn-modern-outline {
  background: transparent;
  color: var(--primary-500) !important;
  border: 2px solid var(--primary-500);
  font-family: var(--font-heading);
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  transition: var(--transition-smooth);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  cursor: pointer;
}

.btn-modern-outline:hover {
  background: var(--primary-50);
  transform: translateY(-2px);
}

.btn-modern-accent {
  background: var(--gradient-accent);
  color: #ffffff !important;
  font-family: var(--font-heading);
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  border: none;
  box-shadow: var(--shadow-md);
  transition: var(--transition-smooth);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.btn-modern-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(255, 107, 53, 0.3);
  filter: brightness(1.05);
}

/* --- Cartes (Cards) Modernisées --- */
.card-modern {
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-md);
  transition: var(--transition-smooth);
  overflow: hidden;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.card-modern:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-200);
}

.card-modern-img-wrapper {
  overflow: hidden;
  position: relative;
  aspect-ratio: 16/9;
}

.card-modern-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-smooth);
}

.card-modern:hover .card-modern-img {
  transform: scale(1.05);
}

.card-modern-body {
  padding: 24px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

/* --- Hero Section Modernisée --- */
.hero-modern {
  background: var(--gradient-hero);
  position: relative;
  padding: 120px 0 80px 0;
  color: #ffffff;
  overflow: hidden;
}

.hero-modern::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -20%;
  width: 100%;
  height: 200%;
  background: radial-gradient(circle, rgba(0, 170, 249, 0.15) 0%, transparent 60%);
  pointer-events: none;
}

.hero-modern-title {
  font-family: var(--font-heading);
  font-size: var(--text-5xl);
  font-weight: 800;
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  margin-bottom: 20px;
  color: #ffffff;
}

/* --- Animations de Défilement (Scroll Animations) --- */
.animate-fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-fade-in-up.active {
  opacity: 1;
  transform: translateY(0);
}

/* Effet Shimmer de Chargement */
.shimmer {
  background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-200) 50%, var(--gray-100) 75%);
  background-size: 200% 100%;
  animation: loading-shimmer 1.5s infinite;
}

@keyframes loading-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* --- Navigation Latérale (Sidebar) --- */
.research-sidebar {
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(241, 241, 241, 0.957); 
  overflow: hidden;
}

.sidebar-header {
  padding: 20px 24px;
  border-bottom: 2px solid var(--primary-500);
  background: var(--gray-50);
}

.sidebar-header h5 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--gray-800);
  font-size: var(--text-base);
  letter-spacing: 0.05em;
}

.sidebar-items {
  padding: 8px 0;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 24px;
  color: var(--gray-600) !important;
  font-weight: 500;
  text-decoration: none !important;
  border-left: 3px solid transparent;
  transition: var(--transition-smooth);
}

.sidebar-link i {
  font-size: 1.25rem;
  color: var(--gray-400);
  transition: var(--transition-smooth);
}

.sidebar-link:hover {
  background: var(--primary-50);
  color: var(--primary-600) !important;
  padding-left: 28px;
}

.sidebar-link:hover i {
  color: var(--primary-500);
}

.sidebar-link.active {
  background: var(--primary-50);
  color: var(--primary-600) !important;
  border-left-color: var(--primary-500);
  font-weight: 600;
}

.sidebar-link.active i {
  color: var(--primary-500);
}