/* ============================================================================
   SMOOTH PAGE TRANSITIONS - CSS Styles
   File: static/css/page-transitions.css
   ============================================================================ */

/* ============================================================================
   LOADING PROGRESS BAR
   ============================================================================ */
.page-transition-loading-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.page-transition-loading-bar.active {
    opacity: 1;
}

.page-transition-loading-bar-inner {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2, #667eea);
    background-size: 200% 100%;
    animation: loadingBarGradient 1.5s ease-in-out infinite;
    width: 0%;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
}

.page-transition-loading-bar.error .page-transition-loading-bar-inner {
    background: linear-gradient(90deg, #ef4444, #dc2626, #ef4444);
    background-size: 200% 100%;
}

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

/* ============================================================================
   PAGE CONTAINER
   ============================================================================ */
[data-barba="container"] {
    position: relative;
    width: 100%;
}

/* Prevent layout shift during transitions */
[data-barba="wrapper"] {
    position: relative;
    overflow-x: hidden;
}

/* ============================================================================
   TRANSITION OVERLAY
   ============================================================================ */
.page-transition-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    z-index: 9998;
    transform-origin: bottom;
    transform: scaleY(0);
    pointer-events: none;
}

/* ============================================================================
   FADE TRANSITION STYLES
   ============================================================================ */
.fade-transition-enter {
    opacity: 0;
}

.fade-transition-enter-active {
    opacity: 1;
    transition: opacity 0.4s ease-in-out;
}

.fade-transition-exit {
    opacity: 1;
}

.fade-transition-exit-active {
    opacity: 0;
    transition: opacity 0.4s ease-in-out;
}

/* ============================================================================
   SLIDE TRANSITION STYLES
   ============================================================================ */
.slide-transition-enter {
    opacity: 0;
    transform: translateX(100%);
}

.slide-transition-enter-active {
    opacity: 1;
    transform: translateX(0);
    transition: all 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.slide-transition-exit {
    opacity: 1;
    transform: translateX(0);
}

.slide-transition-exit-active {
    opacity: 0;
    transform: translateX(-100%);
    transition: all 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
}

/* ============================================================================
   SLIDE UP TRANSITION STYLES
   ============================================================================ */
.slide-up-transition-enter {
    opacity: 0;
    transform: translateY(50px);
}

.slide-up-transition-enter-active {
    opacity: 1;
    transform: translateY(0);
    transition: all 0.5s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.slide-up-transition-exit {
    opacity: 1;
    transform: translateY(0);
}

.slide-up-transition-exit-active {
    opacity: 0;
    transform: translateY(-50px);
    transition: all 0.5s cubic-bezier(0.165, 0.84, 0.44, 1);
}

/* ============================================================================
   SCALE TRANSITION STYLES
   ============================================================================ */
.scale-transition-enter {
    opacity: 0;
    transform: scale(1.1);
}

.scale-transition-enter-active {
    opacity: 1;
    transform: scale(1);
    transition: all 0.5s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.scale-transition-exit {
    opacity: 1;
    transform: scale(1);
}

.scale-transition-exit-active {
    opacity: 0;
    transform: scale(0.9);
    transition: all 0.5s cubic-bezier(0.165, 0.84, 0.44, 1);
}

/* ============================================================================
   NOTIFICATION SYSTEM
   ============================================================================ */
.page-transition-notification {
    position: fixed;
    top: 80px;
    right: 20px;
    padding: 16px 24px;
    border-radius: 12px;
    background: white;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    z-index: 10000;
    font-size: 14px;
    font-weight: 600;
    opacity: 0;
    transform: translateX(400px);
    transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
    max-width: 350px;
}

.page-transition-notification.show {
    opacity: 1;
    transform: translateX(0);
}

.page-transition-notification.info {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
}

.page-transition-notification.success {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.page-transition-notification.error {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
}

.page-transition-notification.warning {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
}

/* ============================================================================
   LOADING SPINNER (OPTIONAL)
   ============================================================================ */
.page-transition-spinner {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50px;
    height: 50px;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.page-transition-spinner.active {
    opacity: 1;
}

.page-transition-spinner::before {
    content: '';
    display: block;
    width: 100%;
    height: 100%;
    border: 4px solid rgba(102, 126, 234, 0.2);
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ============================================================================
   PREFETCH INDICATOR
   ============================================================================ */
a[data-barba-prefetch]::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    transition: width 0.3s ease;
}

a[data-barba-prefetch].prefetched::after {
    width: 100%;
}

/* ============================================================================
   SMOOTH SCROLL BEHAVIOR
   ============================================================================ */
html {
    scroll-behavior: smooth;
}

/* Disable during transitions */
html.is-changing {
    overflow: hidden;
}

/* ============================================================================
   LINK HOVER EFFECTS (Enhanced for transitions)
   ============================================================================ */
a:not(.no-transition) {
    position: relative;
    transition: all 0.3s ease;
}

a:not(.no-transition):hover {
    transform: translateY(-1px);
}

/* ============================================================================
   PREVENT LAYOUT SHIFT
   ============================================================================ */
.barba-container {
    min-height: 100vh;
}

/* ============================================================================
   CUSTOM TRANSITION CLASSES
   ============================================================================ */

/* Homepage to Product Detail */
.transition-to-product {
    animation: slideInFromRight 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
}

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

/* Product Detail back to Homepage */
.transition-to-home {
    animation: slideInFromLeft 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
}

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

/* Dashboard transitions */
.transition-to-dashboard {
    animation: scaleIn 0.5s cubic-bezier(0.165, 0.84, 0.44, 1);
}

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

/* ============================================================================
   RESPONSIVE ADJUSTMENTS
   ============================================================================ */
@media (max-width: 768px) {
    .page-transition-notification {
        top: 70px;
        right: 10px;
        left: 10px;
        max-width: none;
    }
    
    /* Simpler transitions on mobile */
    .slide-transition-enter,
    .slide-transition-exit-active {
        transform: translateX(0);
    }
    
    .slide-transition-enter {
        opacity: 0;
    }
    
    .slide-transition-enter-active,
    .slide-transition-exit {
        opacity: 1;
    }
}

/* ============================================================================
   ACCESSIBILITY
   ============================================================================ */

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
    .page-transition-loading-bar-inner,
    .page-transition-spinner::before,
    .page-transition-notification,
    [data-barba="container"],
    a:not(.no-transition) {
        animation: none !important;
        transition: none !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .page-transition-loading-bar-inner {
        background: #000;
    }
    
    .page-transition-notification {
        border: 2px solid currentColor;
    }
}

/* ============================================================================
PRINT STYLES
   ============================================================================ */
@media print {
    .page-transition-loading-bar,
    .page-transition-overlay,
    .page-transition-notification,
    .page-transition-spinner {
        display: none !important;
    }
}

/* ============================================================================
DARK MODE SUPPORT
   ============================================================================ */
@media (prefers-color-scheme: dark) {
    .page-transition-notification {
        background: #1f2937;
        color: #f9fafb;
    }
    
    .page-transition-notification.info {
        background: linear-gradient(135deg, #1e40af, #1e3a8a);
    }
    
    .page-transition-notification.success {
        background: linear-gradient(135deg, #047857, #065f46);
    }
    
    .page-transition-notification.error {
        background: linear-gradient(135deg, #b91c1c, #991b1b);
    }
    
    .page-transition-notification.warning {
        background: linear-gradient(135deg, #d97706, #b45309);
    }
}

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

/* Disable transition for specific links */
.no-transition {
    /* Barba will skip these links */
}

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

/* Add loading cursor during transitions */
.is-loading {
    cursor: wait !important;
}

html.is-changing,
html.is-loading {
    cursor: wait;
}

html.is-changing *,
html.is-loading * {
    pointer-events: none;
}

/* ============================================================================
   PERFORMANCE OPTIMIZATIONS
   ============================================================================ */

/* GPU acceleration for transitions */
[data-barba="container"] {
    will-change: transform, opacity;
    backface-visibility: hidden;
    perspective: 1000px;
}

/* Prevent flicker */
.page-transition-loading-bar,
.page-transition-overlay,
.page-transition-notification {
    backface-visibility: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}