/**
 * =====================================================
 * PAGE TRANSITIONS - Global Animation System
 * Sistem Inventaris Lab PTI UMS
 * =====================================================
 * 
 * Modern page transition animations with:
 * - Fade + Slide + Slight Scale effects
 * - Duration: 250-350ms (fast & smooth)
 * - Easing: cubic-bezier(0.4, 0, 0.2, 1)
 * - Respects prefers-reduced-motion
 */

/* =====================================================
   CSS CUSTOM PROPERTIES (Animation Tokens)
   ===================================================== */
:root {
    /* Transition durations */
    --page-transition-duration: 300ms;
    --page-transition-exit-duration: 200ms;
    
    /* Easing functions */
    --page-transition-ease-in: cubic-bezier(0.4, 0, 1, 1);
    --page-transition-ease-out: cubic-bezier(0, 0, 0.2, 1);
    --page-transition-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Slide distances */
    --page-slide-distance: 12px;
    --page-slide-exit-distance: 8px;
    
    /* Scale values */
    --page-scale-start: 0.98;
    --page-scale-end: 1;
}

/* =====================================================
   PAGE WRAPPER STYLES
   ===================================================== */

/* Main page wrapper - wrap entire page content */
.page-transition-wrapper {
    opacity: 1;
    transform: translateY(0) scale(1);
    transition: 
        opacity var(--page-transition-duration) var(--page-transition-ease-out),
        transform var(--page-transition-duration) var(--page-transition-ease-out);
    will-change: opacity, transform;
}

/* Initial state for page enter animation */
.page-transition-wrapper.page-enter {
    opacity: 0;
    transform: translateY(var(--page-slide-distance)) scale(var(--page-scale-start));
}

/* Active state after enter animation completes */
.page-transition-wrapper.page-enter-active {
    opacity: 1;
    transform: translateY(0) scale(1);
}

/* Exit state for page leave animation */
.page-transition-wrapper.page-exit {
    opacity: 0;
    transform: translateY(calc(var(--page-slide-exit-distance) * -1)) scale(var(--page-scale-start));
    transition-duration: var(--page-transition-exit-duration);
    pointer-events: none;
}

/* =====================================================
   CONTENT SECTION ANIMATIONS
   ===================================================== */

/* Staggered animation for content sections */
.page-transition-wrapper .animate-on-enter {
    opacity: 0;
    transform: translateY(16px);
    transition: 
        opacity 400ms var(--page-transition-ease-out),
        transform 400ms var(--page-transition-ease-out);
}

.page-transition-wrapper.page-enter-active .animate-on-enter {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delays for multiple elements */
.page-transition-wrapper.page-enter-active .animate-on-enter:nth-child(1) { transition-delay: 50ms; }
.page-transition-wrapper.page-enter-active .animate-on-enter:nth-child(2) { transition-delay: 100ms; }
.page-transition-wrapper.page-enter-active .animate-on-enter:nth-child(3) { transition-delay: 150ms; }
.page-transition-wrapper.page-enter-active .animate-on-enter:nth-child(4) { transition-delay: 200ms; }
.page-transition-wrapper.page-enter-active .animate-on-enter:nth-child(5) { transition-delay: 250ms; }
.page-transition-wrapper.page-enter-active .animate-on-enter:nth-child(6) { transition-delay: 300ms; }

/* =====================================================
   NAVBAR ANIMATION (Slide down on page load)
   ===================================================== */
.navbar-animate {
    animation: navbarSlideDown 400ms var(--page-transition-ease-out) forwards;
}

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

/* =====================================================
   CARD & COMPONENT ANIMATIONS
   ===================================================== */

/* Fade up animation for cards */
.fade-up {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 400ms var(--page-transition-ease-out) forwards;
}

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Fade in animation */
.fade-in {
    opacity: 0;
    animation: fadeIn 300ms var(--page-transition-ease-out) forwards;
}

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

/* Scale up animation */
.scale-up {
    opacity: 0;
    transform: scale(0.95);
    animation: scaleUp 350ms var(--page-transition-ease-out) forwards;
}

@keyframes scaleUp {
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Slide in from left */
.slide-in-left {
    opacity: 0;
    transform: translateX(-20px);
    animation: slideInLeft 350ms var(--page-transition-ease-out) forwards;
}

@keyframes slideInLeft {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Slide in from right */
.slide-in-right {
    opacity: 0;
    transform: translateX(20px);
    animation: slideInRight 350ms var(--page-transition-ease-out) forwards;
}

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

/* =====================================================
   STAGGERED ANIMATION DELAYS
   ===================================================== */
.delay-1 { animation-delay: 50ms !important; }
.delay-2 { animation-delay: 100ms !important; }
.delay-3 { animation-delay: 150ms !important; }
.delay-4 { animation-delay: 200ms !important; }
.delay-5 { animation-delay: 250ms !important; }
.delay-6 { animation-delay: 300ms !important; }
.delay-7 { animation-delay: 350ms !important; }
.delay-8 { animation-delay: 400ms !important; }

/* =====================================================
   LINK TRANSITION OVERLAY
   ===================================================== */
.page-transition-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0);
    pointer-events: none;
    z-index: 9999;
    transition: background 200ms var(--page-transition-ease-in);
}

.page-transition-overlay.active {
    background: rgba(255, 255, 255, 0.5);
    pointer-events: all;
}

/* Dark mode overlay */
@media (prefers-color-scheme: dark) {
    .page-transition-overlay.active {
        background: rgba(0, 0, 0, 0.3);
    }
}

/* =====================================================
   LOADING INDICATOR (Optional)
   ===================================================== */
.page-loading-indicator {
    position: fixed;
    top: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, #6366f1, #8b5cf6, #a855f7);
    z-index: 10000;
    transition: width 200ms ease-out;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

.page-loading-indicator.loading {
    animation: loadingProgress 800ms ease-out forwards;
}

.page-loading-indicator.complete {
    width: 100%;
    opacity: 0;
    transition: width 100ms ease-out, opacity 200ms ease-out 100ms;
}

@keyframes loadingProgress {
    0% { width: 0; }
    20% { width: 25%; }
    50% { width: 60%; }
    80% { width: 85%; }
    100% { width: 90%; }
}

/* =====================================================
   MOBILE OPTIMIZATIONS
   ===================================================== */
@media screen and (max-width: 768px) {
    :root {
        --page-slide-distance: 8px;
        --page-slide-exit-distance: 6px;
        --page-transition-duration: 250ms;
        --page-transition-exit-duration: 180ms;
    }
    
    /* Disable some animations on mobile for performance */
    .page-transition-wrapper .animate-on-enter {
        transform: translateY(12px);
    }
}

/* =====================================================
   REDUCED MOTION SUPPORT
   ===================================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .page-transition-wrapper,
    .page-transition-wrapper.page-enter,
    .page-transition-wrapper.page-enter-active,
    .page-transition-wrapper.page-exit {
        opacity: 1 !important;
        transform: none !important;
        transition: none !important;
    }
    
    .fade-up,
    .fade-in,
    .scale-up,
    .slide-in-left,
    .slide-in-right {
        opacity: 1 !important;
        transform: none !important;
        animation: none !important;
    }
    
    .navbar-animate {
        animation: none !important;
        opacity: 1 !important;
        transform: none !important;
    }
}

/* =====================================================
   UTILITY CLASSES
   ===================================================== */

/* Instant transition (no animation) */
.no-transition {
    transition: none !important;
    animation: none !important;
}

/* Hardware acceleration hint */
.gpu-accelerated {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* Smooth scroll for anchors */
html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}