/* Core Animations and Intersection Observer Classes */

.fade-in {
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.fade-in.is-visible {
  opacity: 1;
}

.slide-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.slide-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.slide-left {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.slide-left.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.slide-right {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.slide-right.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* Stagger Children */
.stagger-container.is-visible .stagger-item:nth-child(1) { transition-delay: 0.1s; }
.stagger-container.is-visible .stagger-item:nth-child(2) { transition-delay: 0.2s; }
.stagger-container.is-visible .stagger-item:nth-child(3) { transition-delay: 0.3s; }
.stagger-container.is-visible .stagger-item:nth-child(4) { transition-delay: 0.4s; }
.stagger-container.is-visible .stagger-item:nth-child(5) { transition-delay: 0.5s; }
.stagger-container.is-visible .stagger-item:nth-child(6) { transition-delay: 0.6s; }

.stagger-item {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.stagger-container.is-visible .stagger-item {
  opacity: 1;
  transform: translateY(0);
}

/* Hover Effects */
.hover-lift {
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.hover-lift:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

/* Infinite Animations */
@keyframes float {
  0% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
  100% { transform: translateY(0); }
}

.animate-float {
  animation: float 6s ease-in-out infinite;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

.animate-pulse {
  animation: pulse 3s ease-in-out infinite;
}

/* Page Transition */
.page-loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-primary);
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: opacity 0.5s ease-out, visibility 0.5s ease-out;
}

.page-loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255,255,255,0.2);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}