/**
 * ANIMATIONS & TRANSITIONS
 * Modern, smooth animation system
 */

/* ============================================================================
   FADE ANIMATIONS
   ============================================================================ */

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

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

.fade-in {
  animation: fadeIn 0.6s var(--timing-ease-in-out) forwards;
}

.fade-out {
  animation: fadeOut 0.6s var(--timing-ease-in-out) forwards;
}

/* ============================================================================
   SLIDE ANIMATIONS
   ============================================================================ */

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

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

.slide-in-up {
  animation: slideInUp 0.6s var(--timing-ease-in-out) forwards;
}

.slide-in-down {
  animation: slideInDown 0.6s var(--timing-ease-in-out) forwards;
}

.slide-in-left {
  animation: slideInLeft 0.6s var(--timing-ease-in-out) forwards;
}

.slide-in-right {
  animation: slideInRight 0.6s var(--timing-ease-in-out) forwards;
}

/* ============================================================================
   SCALE ANIMATIONS
   ============================================================================ */

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

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

.scale-in {
  animation: scaleIn 0.4s var(--timing-ease-in-out) forwards;
}

.scale-out {
  animation: scaleOut 0.4s var(--timing-ease-in-out) forwards;
}

/* ============================================================================
   PULSE & BREATHING ANIMATIONS
   ============================================================================ */

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

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

.pulse {
  animation: pulse 2s var(--timing-ease-in-out) infinite;
}

.breath {
  animation: breath 3s var(--timing-ease-in-out) infinite;
}

/* ============================================================================
   SHIMMER & SKELETON LOADING
   ============================================================================ */

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

.skeleton {
  background: linear-gradient(
    90deg,
    rgba(0, 0, 0, 0.1) 0%,
    rgba(0, 0, 0, 0.2) 50%,
    rgba(0, 0, 0, 0.1) 100%
  );
  background-size: 1000px 100%;
  animation: shimmer 2s infinite;
}

/* ============================================================================
   GRADIENT ANIMATIONS
   ============================================================================ */

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

.gradient-animated {
  background-size: 200% 200%;
  animation: gradientShift 3s ease infinite;
}

/* ============================================================================
   BOUNCE ANIMATIONS
   ============================================================================ */

@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.bounce {
  animation: bounce 1s ease-in-out infinite;
}

/* ============================================================================
   SPIN ANIMATIONS
   ============================================================================ */

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

.spin {
  animation: spin 1s linear infinite;
}

/* ============================================================================
   FLIP ANIMATIONS
   ============================================================================ */

@keyframes flipIn {
  from {
    opacity: 0;
    transform: perspective(400px) rotateY(90deg);
  }
  to {
    opacity: 1;
    transform: perspective(400px) rotateY(0deg);
  }
}

.flip-in {
  animation: flipIn 0.6s var(--timing-ease-in-out) forwards;
}

/* ============================================================================
   STAGGER ANIMATIONS
   ============================================================================ */

.stagger {
  animation: slideInUp 0.6s var(--timing-ease-in-out) forwards;
}

.stagger > * {
  animation: slideInUp 0.6s var(--timing-ease-in-out) forwards;
}

.stagger > *:nth-child(1) { animation-delay: 0ms; }
.stagger > *:nth-child(2) { animation-delay: 100ms; }
.stagger > *:nth-child(3) { animation-delay: 200ms; }
.stagger > *:nth-child(4) { animation-delay: 300ms; }
.stagger > *:nth-child(5) { animation-delay: 400ms; }
.stagger > *:nth-child(n+6) { animation-delay: 500ms; }

/* ============================================================================
   HOVER EFFECTS
   ============================================================================ */

.hover-lift {
  transition: transform var(--duration-200) var(--timing-ease),
              box-shadow var(--duration-200) var(--timing-ease);
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.hover-glow {
  transition: text-shadow var(--duration-300) var(--timing-ease-in-out);
}

.hover-glow:hover {
  text-shadow: 0 0 20px rgba(99, 102, 241, 0.5);
}

/* ============================================================================
   TRANSITION UTILITIES
   ============================================================================ */

.transition-fast {
  transition: all var(--duration-100) var(--timing-ease);
}

.transition-base {
  transition: all var(--duration-200) var(--timing-ease);
}

.transition-slow {
  transition: all var(--duration-500) var(--timing-ease-in-out);
}