/**
 * SPA Transitions CSS
 * Hiệu ứng slide animation cho page transitions
 */

/* ==========================================================================
   Page Container Transitions
   ========================================================================== */

.spa-page-container {
    position: relative;
    overflow: hidden;
    min-height: 100vh;
}

/* Wrapper cho old/new pages */
.spa-page-old,
.spa-page-new {
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ==========================================================================
   Slide Animations
   ========================================================================== */

/* Slide from right to left */
.spa-slide-left-enter {
    transform: translateX(100%);
    opacity: 0;
}

.spa-slide-left-enter-active {
    transform: translateX(0);
    opacity: 1;
}

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

.spa-slide-left-exit-active {
    transform: translateX(-100%);
    opacity: 0.5;
}

/* Slide from left to right */
.spa-slide-right-enter {
    transform: translateX(-100%);
    opacity: 0;
}

.spa-slide-right-enter-active {
    transform: translateX(0);
    opacity: 1;
}

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

.spa-slide-right-exit-active {
    transform: translateX(100%);
    opacity: 0.5;
}

/* ==========================================================================
   Fade Animations (alternative)
   ========================================================================== */

.spa-fade-enter {
    opacity: 0;
}

.spa-fade-enter-active {
    opacity: 1;
}

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

.spa-fade-exit-active {
    opacity: 0;
}

/* ==========================================================================
   Loading Indicator
   ========================================================================== */

#spa-loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, #26A9E0 0%, #26A9E0 50%, transparent 50%);
    background-size: 200% 100%;
    animation: spa-loading-animation 1s linear infinite;
    z-index: 99999;
    pointer-events: none;
}

@keyframes spa-loading-animation {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: 0 0;
    }
}

/* Spinner loading (optional) */
.spa-loading-spinner {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 99998;
    pointer-events: none;
}

.spa-loading-spinner::after {
    content: '';
    display: block;
    width: 40px;
    height: 40px;
    border: 4px solid rgba(38, 169, 224, 0.2);
    border-top-color: #26A9E0;
    border-radius: 50%;
    animation: spa-spinner-rotation 0.8s linear infinite;
}

@keyframes spa-spinner-rotation {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* ==========================================================================
   Prevent Flash During Transition
   ========================================================================== */

.spa-transitioning {
    overflow: hidden;
}

.spa-transitioning * {
    pointer-events: none !important;
}

/* ==========================================================================
   Responsive Optimizations
   ========================================================================== */

@media (max-width: 768px) {
    .spa-page-old,
    .spa-page-new {
        transition-duration: 0.3s;
    }
    
    #spa-loading {
        height: 2px;
    }
}

/* ==========================================================================
   Hardware Acceleration
   ========================================================================== */

.spa-page-old,
.spa-page-new {
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    -webkit-perspective: 1000px;
    perspective: 1000px;
}

/* ==========================================================================
   Smooth Scroll
   ========================================================================== */

html {
    scroll-behavior: smooth;
}

/* Disable smooth scroll during SPA transitions */
html.spa-transitioning {
    scroll-behavior: auto;
}

/* ==========================================================================
   Z-index Management
   ========================================================================== */

.spa-page-old {
    z-index: 1;
}

.spa-page-new {
    z-index: 2;
}

/* ==========================================================================
   Additional Effects (Optional)
   ========================================================================== */

/* Scale effect */
.spa-scale-enter {
    transform: scale(0.95);
    opacity: 0;
}

.spa-scale-enter-active {
    transform: scale(1);
    opacity: 1;
}

/* Blur effect during transition */
.spa-page-old.spa-transitioning {
    filter: blur(2px);
}

/* ==========================================================================
   Mobile Optimizations
   ========================================================================== */

@media (max-width: 768px) {
    /* Faster transitions on mobile */
    .spa-page-old,
    .spa-page-new {
        transition-duration: 0.25s !important;
    }
    
    /* Reduce motion for users who prefer it */
    @media (prefers-reduced-motion: reduce) {
        .spa-page-old,
        .spa-page-new {
            transition-duration: 0.1s !important;
        }
    }
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
    #spa-loading,
    .spa-loading-spinner {
        display: none !important;
    }
}