/* ==========================================================================
   ADVANCED LOADING SCREEN & PERFORMANCE
   ========================================================================== */

/* Loading Screen - Optimized for Fast Loading */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    will-change: opacity, visibility;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* Faster loading for better UX */
.loading-screen.fast-loading {
    animation: fastFadeOut 0.3s ease forwards;
}

@keyframes fastFadeOut {
    from { opacity: 1; }
    to { opacity: 0; visibility: hidden; }
}

.loading-logo {
    width: 80px;
    height: 80px;
    margin-bottom: var(--space-xl);
    animation: logoFloat 1.5s ease-in-out infinite;
    object-fit: contain;
}

@keyframes logoFloat {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
}

/* Disable heavy animations on slow devices */
.reduced-animations .loading-logo {
    animation: none;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 2px solid rgba(0, 242, 169, 0.15);
    border-top: 2px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: var(--space-lg);
    will-change: transform;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Disable spinner animation on slow devices */
.reduced-animations .loading-spinner {
    animation-duration: 2s;
    border-width: 1px;
}

.loading-text {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: var(--space-md);
    animation: pulse 1.2s ease-in-out infinite;
    text-align: center;
    max-width: 200px;
}

/* Disable text animation on slow devices */
.reduced-animations .loading-text {
    animation: none;
}

.loading-progress {
    width: 240px;
    height: 4px;
    background: rgba(0, 242, 169, 0.1);
    border-radius: 2px;
    overflow: hidden;
    position: relative;
}

.loading-progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    width: 0%;
    border-radius: 2px;
    transition: width 0.1s ease;
    position: relative;
    will-change: width;
}

.loading-progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s ease-in-out infinite;
}

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

/* Page Transition Effects */
.page-transition {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-bg);
    z-index: 9998;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.page-transition.active {
    opacity: 1;
    visibility: visible;
}

/* Performance Optimizations */
.lazy-load {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.lazy-load.loaded {
    opacity: 1;
    transform: translateY(0);
}

/* Preload Critical Resources */
.preload-critical {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
}

/* Advanced Cache Control */
.cached-resource {
    will-change: auto;
}

/* Site loaded optimizations */
.site-loaded {
    opacity: 1;
}

.site-loaded .loading-screen {
    display: none;
}

/* Reduced animations for slow devices */
.reduced-animations .particles-container,
.reduced-animations .matrix-rain,
.reduced-animations .hero-geometry {
    display: none !important;
}

.reduced-animations .card::before,
.reduced-animations .card::after {
    display: none !important;
}

.reduced-animations .hero-hologram {
    animation: none !important;
}

/* Fast loading indicators */
.fast-loading .loading-progress-fill {
    transition: width 0.05s linear;
}

.fast-loading .loading-text {
    transition: all 0.1s ease;
}

/* Skip loading button */
.skip-loading {
    position: absolute;
    bottom: 30px;
    right: 30px;
    background: rgba(0, 242, 169, 0.1);
    border: 1px solid rgba(0, 242, 169, 0.3);
    color: var(--accent-primary);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.skip-loading:hover {
    background: rgba(0, 242, 169, 0.2);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.skip-loading:active {
    transform: translateY(0);
}

@media (max-width: 768px) {
    .skip-loading {
        bottom: 20px;
        right: 20px;
        padding: 6px 12px;
        font-size: 0.8rem;
    }
}

/* GPU Acceleration for Smooth Animations */
.gpu-accelerated {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* Smooth Scroll Container */
.smooth-scroll {
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

/* Performance Monitors */
.performance-warning {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(255, 107, 107, 0.9);
    color: white;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    z-index: 9997;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
}

.performance-warning.show {
    opacity: 1;
    transform: translateY(0);
}

/* Optimized Animations for Low-end Devices */
@media (max-width: 768px) {
    .loading-screen {
        background: var(--primary-bg);
    }
    
    .loading-logo {
        width: 60px;
        height: 60px;
        animation-duration: 3s;
    }
    
    .loading-spinner {
        width: 40px;
        height: 40px;
        border-width: 2px;
    }
    
    .loading-progress {
        width: 150px;
        height: 2px;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    .loading-logo,
    .loading-spinner,
    .loading-progress-fill::after {
        animation: none;
    }
    
    .loading-text {
        animation: none;
        opacity: 1;
    }
    
    .lazy-load {
        transition-duration: 0.01ms;
    }
}

/* Network Speed Optimizations */
@media (max-width: 768px) and (max-resolution: 192dpi) {
    .loading-screen {
        background-image: none;
    }
    
    .particles-container,
    .matrix-rain {
        display: none;
    }
}

/* Battery Status Optimizations */
.low-battery .particles-container,
.low-battery .matrix-rain,
.low-battery .hero-geometry {
    display: none;
}

.low-battery .card::before,
.low-battery .card::after {
    display: none;
}

.low-battery .hero-hologram {
    animation: none;
}

/* Connection Speed Indicators */
.slow-connection .loading-text::after {
    content: ' (Slow Connection)';
    color: var(--text-muted);
}

.fast-connection .loading-text::after {
    content: ' (High Speed)';
    color: var(--accent-primary);
}

/* Error States */
.loading-error {
    color: #FF6B6B;
    text-align: center;
    padding: var(--space-lg);
}

.loading-error-icon {
    font-size: 2rem;
    margin-bottom: var(--space-md);
}

.loading-retry {
    background: transparent;
    border: 2px solid #FF6B6B;
    color: #FF6B6B;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-top: var(--space-md);
}

.loading-retry:hover {
    background: #FF6B6B;
    color: white;
}

/* Success States */
.loading-success {
    color: var(--accent-primary);
    text-align: center;
}

.loading-success-icon {
    font-size: 2rem;
    margin-bottom: var(--space-md);
    animation: successPulse 0.6s ease;
}

@keyframes successPulse {
    0% { transform: scale(0.8); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 1; }
    100% { transform: scale(1); opacity: 1; }
}

/* Critical Resource Loading */
.critical-loading {
    position: relative;
}

.critical-loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 242, 169, 0.2), transparent);
    animation: criticalShimmer 1.5s ease-in-out infinite;
}

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

/* Accessibility Improvements */
.loading-screen[aria-label] {
    /* Screen reader announcements */
}

.skip-loading {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--accent-primary);
    color: var(--primary-bg);
    padding: 8px;
    text-decoration: none;
    transition: top 0.3s;
    border-radius: 0 0 4px 4px;
}

.skip-loading:focus {
    top: 0;
}