/**
 * Animation Utilities
 * Professional micro-interactions and animations
 */

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

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

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

.fade-in {
    animation: fadeIn var(--duration-base) var(--ease-in-out);
}

.fade-out {
    animation: fadeOut var(--duration-base) var(--ease-in-out);
}

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

@keyframes slideInUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes slideInDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes slideInLeft {
    from {
        transform: translateX(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.slide-in-up {
    animation: slideInUp var(--duration-base) var(--ease-out);
}

.slide-in-down {
    animation: slideInDown var(--duration-base) var(--ease-out);
}

.slide-in-left {
    animation: slideInLeft var(--duration-base) var(--ease-out);
}

.slide-in-right {
    animation: slideInRight var(--duration-base) var(--ease-out);
}

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

@keyframes scaleIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes scaleOut {
    from {
        transform: scale(1);
        opacity: 1;
    }
    to {
        transform: scale(0.9);
        opacity: 0;
    }
}

.scale-in {
    animation: scaleIn var(--duration-base) var(--ease-out);
}

.scale-out {
    animation: scaleOut var(--duration-base) var(--ease-in);
}

/* =============================================================================
   ROTATE ANIMATIONS
   ============================================================================= */

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

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

.spin-slow {
    animation: spin 2s linear infinite;
}

.spin-fast {
    animation: spin 0.5s linear infinite;
}

/* =============================================================================
   PULSE ANIMATION
   ============================================================================= */

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

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

/* =============================================================================
   BOUNCE ANIMATION
   ============================================================================= */

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

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

/* =============================================================================
   SHAKE ANIMATION
   ============================================================================= */

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-10px);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(10px);
    }
}

.shake {
    animation: shake 0.5s ease-in-out;
}

/* =============================================================================
   SHIMMER LOADING EFFECT
   ============================================================================= */

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

.shimmer {
    background: linear-gradient(
        90deg,
        var(--color-gray-200) 0%,
        var(--color-gray-300) 50%,
        var(--color-gray-200) 100%
    );
    background-size: 1000px 100%;
    animation: shimmer 2s infinite;
}

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

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

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

.hover-grow {
    transition: transform var(--duration-fast) var(--ease-out);
}

.hover-grow:hover {
    transform: scale(1.05);
}

.hover-shrink {
    transition: transform var(--duration-fast) var(--ease-out);
}

.hover-shrink:hover {
    transform: scale(0.95);
}

/* =============================================================================
   GRADIENT ANIMATION
   ============================================================================= */

@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;
}

/* =============================================================================
   SKELETON LOADING
   ============================================================================= */

.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-gray-200) 0%,
        var(--color-gray-300) 50%,
        var(--color-gray-200) 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

.skeleton-text {
    height: 1em;
    margin-bottom: var(--space-2);
}

.skeleton-title {
    height: 2em;
    margin-bottom: var(--space-3);
}

.skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
}

.skeleton-button {
    height: 40px;
    width: 120px;
}

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

.transition-none {
    transition: none !important;
}

.transition-all {
    transition: all var(--duration-base) var(--ease-in-out);
}

.transition-colors {
    transition: var(--transition-colors);
}

.transition-transform {
    transition: var(--transition-transform);
}

.transition-opacity {
    transition: var(--transition-opacity);
}

.transition-shadow {
    transition: var(--transition-shadow);
}

/* Transition Durations */
.duration-fast {
    transition-duration: var(--duration-fast) !important;
}

.duration-base {
    transition-duration: var(--duration-base) !important;
}

.duration-slow {
    transition-duration: var(--duration-slow) !important;
}

/* =============================================================================
   ENTRANCE ANIMATIONS
   ============================================================================= */

.entrance-fade {
    animation: fadeIn var(--duration-base) var(--ease-in-out);
}

.entrance-slide-up {
    animation: slideInUp var(--duration-base) var(--ease-out);
}

.entrance-scale {
    animation: scaleIn var(--duration-base) var(--ease-out);
}

/* Stagger animations */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }

/* =============================================================================
   PROGRESS INDICATORS
   ============================================================================= */

@keyframes progress {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

.progress-indeterminate::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        var(--color-primary),
        transparent
    );
    animation: progress 1.5s ease-in-out infinite;
}

/* =============================================================================
   RESPONSIVE ANIMATIONS
   ============================================================================= */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .skeleton,
    .shimmer,
    .spin,
    .pulse,
    .bounce {
        animation: none !important;
    }
}