/* ========== Keyframe Animations ========== */

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-10px); }
  60% { transform: translateX(-50%) translateY(-5px); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes slideInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

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

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

/* ========== Animation Classes ========== */

.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--duration-slow) var(--ease-smooth),
              transform var(--duration-slow) var(--ease-smooth);
}

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

.fade-in-scale {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity var(--duration-slow) var(--ease-smooth),
              transform var(--duration-slow) var(--ease-smooth);
}

.fade-in-scale.is-visible {
  opacity: 1;
  transform: scale(1);
}

/* ========== Stagger Animations ========== */

.stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-normal) var(--ease-smooth),
              transform var(--duration-normal) var(--ease-smooth);
}

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

.stagger > *:nth-child(1) { transition-delay: 0ms; }
.stagger > *:nth-child(2) { transition-delay: var(--delay-1); }
.stagger > *:nth-child(3) { transition-delay: var(--delay-2); }
.stagger > *:nth-child(4) { transition-delay: var(--delay-3); }
.stagger > *:nth-child(5) { transition-delay: var(--delay-4); }
.stagger > *:nth-child(6) { transition-delay: var(--delay-5); }

/* ========== Hero Animations ========== */

.hero__logo { animation: float 3s ease-in-out infinite; }
.hero__title { animation: slideInUp 0.8s var(--ease-smooth) 0ms both; }
.hero__subtitle { animation: slideInUp 0.8s var(--ease-smooth) 200ms both; }
.hero__description { animation: slideInUp 0.8s var(--ease-smooth) 400ms both; }
.hero__cta { animation: slideInUp 0.8s var(--ease-smooth) 600ms both; }
.hero__scroll-indicator { animation: bounce 2s ease-in-out infinite; animation-delay: 1s; }

/* ========== Loading States ========== */

.is-loading {
  position: relative;
  pointer-events: none;
}

.is-loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 24px;
  height: 24px;
  margin: -12px 0 0 -12px;
  border: 2px solid var(--glass-border);
  border-top-color: var(--color-accent-blue);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* ========== Reduced Motion ========== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .hero__logo,
  .hero__scroll-indicator {
    animation: none;
  }
  
  .hero__title,
  .hero__subtitle,
  .hero__description,
  .hero__cta {
    animation: none;
    opacity: 1;
    transform: none;
  }
}