/**
 * Progressive Loading CSS
 * Styles for skeleton loading, animations, and smooth transitions
 */

/* Base Progressive Loading Styles */
[data-progressive] {
    transition: opacity 0.3s ease, transform 0.3s ease;
}

[data-progressive]:not(.progressive-loaded) {
    opacity: 0;
    transform: translateY(20px);
}

[data-progressive].progressive-loaded {
    opacity: 1;
    transform: translateY(0);
}

[data-progressive].progressive-loading {
    opacity: 0.6;
}

[data-progressive].progressive-error {
    opacity: 0.3;
    background-color: #f8f9fa;
}

/* Skeleton Loading Base */
.progressive-skeleton {
    position: relative;
    overflow: hidden;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

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

/* Image Skeleton */
.progressive-image-skeleton {
    background-color: #f8f9fa;
    border-radius: 8px;
    min-height: 200px;
    position: relative;
}

.progressive-image-skeleton::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    background: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iNDAiIGhlaWdodD0iNDAiIHZpZXdCb3g9IjAgMCA0MCA0MCIgZmlsbD0ibm9uZSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj4KPHBhdGggZD0iTTM1IDVINUMzLjg5NTQzIDUgMyA1Ljg5NTQzIDMgN1YzM0MzIDM0LjEwNDYgMy44OTU0MyAzNSA1IDM1SDM1QzM2LjEwNDYgMzUgMzcgMzQuMTA0NiAzNyAzM1Y3QzM3IDUuODk1NDMgMzYuMTA0NiA1IDM1IDVaIiBzdHJva2U9IiNDQ0NDQ0MiIHN0cm9rZS13aWR0aD0iMiIgc3Ryb2tlLWxpbmVjYXA9InJvdW5kIiBzdHJva2UtbGluZWpvaW49InJvdW5kIi8+CjxwYXRoIGQ9Ik0xNSAxNUMxNiA2ODU0NiAxNiAxNSAxNiAxNUMxNiAxMy44OTU0IDE1LjEwNDYgMTMgMTQgMTNDMTIuODk1NCAxMyAxMiAxMy44OTU0IDEyIDE1QzEyIDE1LjEwNDYgMTIuODk1NCAxNyAxNCAxN0MxNS4xMDQ2IDE3IDE2IDE1LjEwNDYgMTYgMTVaIiBzdHJva2U9IiNDQ0NDQ0MiIHN0cm9rZS13aWR0aD0iMiIgc3Ryb2tlLWxpbmVjYXA9InJvdW5kIiBzdHJva2UtbGluZWpvaW49InJvdW5kIi8+CjxwYXRoIGQ9Ik0zNyAyNUwyNyAxNUwxNyAyNUgzN1oiIHN0cm9rZT0iI0NDQ0NDQyIgc3Ryb2tlLXdpZHRoPSIyIiBzdHJva2UtbGluZWNhcD0icm91bmQiIHN0cm9rZS1saW5lam9pbj0icm91bmQiLz4KPC9zdmc+Cg==') no-repeat center;
    opacity: 0.3;
}

/* Text Skeleton */
.progressive-text-skeleton {
    padding: 1rem;
    border-radius: 8px;
}

.skeleton-line {
    height: 1rem;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    margin-bottom: 0.75rem;
    border-radius: 4px;
}

.skeleton-line:nth-child(1) { width: 90%; }
.skeleton-line:nth-child(2) { width: 75%; }
.skeleton-line:nth-child(3) { width: 85%; }
.skeleton-line:nth-child(4) { width: 60%; }
.skeleton-line:last-child { margin-bottom: 0; width: 40%; }

/* Heavy Content Skeleton */
.progressive-heavy-skeleton {
    min-height: 300px;
    background: #f8f9fa;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.progressive-heavy-skeleton::before {
    content: '⚡';
    font-size: 3rem;
    opacity: 0.3;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.6; }
}

/* Section Skeleton */
.progressive-section-skeleton {
    min-height: 200px;
    background: #f8f9fa;
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
}

/* Loading States */
.progressive-loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.5) 50%, transparent 70%);
    animation: shimmer 2s infinite;
    pointer-events: none;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Fade In Animation */
.progressive-fade-in {
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Slide In Animation */
.progressive-slide-in {
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Scale In Animation */
.progressive-scale-in {
    animation: scaleIn 0.4s ease-out;
}

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

/* Specific Component Styles */

/* Hero Section Progressive Loading */
.hero-grid-item[data-progressive] {
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.hero-grid-item[data-progressive]:not(.progressive-loaded) {
    opacity: 0;
    transform: scale(0.95) translateY(40px);
}

.hero-grid-item[data-progressive].progressive-loaded {
    opacity: 1;
    transform: scale(1) translateY(0);
}

/* Package Cards Progressive Loading */
.card[data-progressive] {
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.card[data-progressive]:not(.progressive-loaded) {
    opacity: 0;
    transform: translateY(30px);
}

.card[data-progressive].progressive-loaded {
    opacity: 1;
    transform: translateY(0);
}

/* Blog Items Progressive Loading */
.featured_card[data-progressive] {
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.featured_card[data-progressive]:not(.progressive-loaded) {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
}

.featured_card[data-progressive].progressive-loaded {
    opacity: 1;
    transform: translateY(0) scale(1);
}

/* Glass Container Progressive Loading */
glass-container[data-progressive] {
    transition: opacity 1s ease, transform 1s ease;
}

glass-container[data-progressive]:not(.progressive-loaded) {
    opacity: 0;
    transform: scale(0.9) rotateY(10deg);
}

glass-container[data-progressive].progressive-loaded {
    opacity: 1;
    transform: scale(1) rotateY(0deg);
}

/* Progressive Loading Performance Optimization */
.progressive-loaded {
    will-change: auto;
}

[data-progressive]:not(.progressive-loaded) {
    will-change: opacity, transform;
}

/* Progressive Loading Priority System */
[data-progressive][data-critical="true"] {
    transition-duration: 0.2s;
}

[data-progressive][data-priority="high"] {
    transition-duration: 0.3s;
}

[data-progressive][data-priority="medium"] {
    transition-duration: 0.5s;
}

[data-progressive][data-priority="low"] {
    transition-duration: 0.7s;
}

/* Skeleton Variations by Content Type */
.progressive-skeleton.package-card {
    height: 400px;
    border-radius: 12px;
    background: linear-gradient(145deg, #f8f9fa 0%, #e9ecef 100%);
}

.progressive-skeleton.blog-item {
    height: 300px;
    border-radius: 15px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.progressive-skeleton.hero-item {
    border-radius: 20px;
    background: linear-gradient(125deg, #f8f9fa 0%, #e9ecef 50%, #dee2e6 100%);
}

/* Loading Indicators */
.progressive-loading-indicator {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, #007bff, #0056b3);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
    z-index: 9999;
}

.progressive-loading-indicator.active {
    transform: scaleX(1);
}

/* Mobile Optimizations */
@media (max-width: 768px) {
    .progressive-skeleton {
        animation-duration: 2s; /* Slower animation on mobile */
    }

    [data-progressive] {
        transition-duration: 0.4s; /* Faster transitions on mobile */
    }

    .skeleton-line {
        height: 0.875rem; /* Smaller skeleton lines */
        margin-bottom: 0.5rem;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .progressive-skeleton {
        background: linear-gradient(90deg, #333 25%, #444 50%, #333 75%);
    }

    .progressive-image-skeleton {
        background-color: #2a2a2a;
    }

    .progressive-heavy-skeleton,
    .progressive-section-skeleton {
        background: #2a2a2a;
    }

    .skeleton-line {
        background: linear-gradient(90deg, #333 25%, #444 50%, #333 75%);
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    .progressive-skeleton {
        animation: none;
        background: #f0f0f0;
    }

    .skeleton-line {
        animation: none;
        background: #e0e0e0;
    }

    [data-progressive] {
        transition: none;
    }

    .progressive-loading::after {
        animation: none;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .progressive-skeleton {
        background: #e0e0e0;
        border: 2px solid #000;
    }

    .skeleton-line {
        background: #d0d0d0;
        border: 1px solid #000;
    }
}

/* Print Optimization */
@media print {
    [data-progressive]:not(.progressive-loaded) {
        opacity: 1;
        transform: none;
    }

    .progressive-skeleton {
        display: none;
    }
}

/* Utility Classes */
.progressive-immediate {
    transition-duration: 0s;
}

.progressive-delayed {
    transition-delay: 0.2s;
}

.progressive-slow {
    transition-duration: 1s;
}

.progressive-fast {
    transition-duration: 0.2s;
}

/* Progressive Loading Debug Mode */
.progressive-debug [data-progressive] {
    border: 2px dashed #007bff;
    position: relative;
}

.progressive-debug [data-progressive]::before {
    content: attr(data-progressive);
    position: absolute;
    top: -25px;
    left: 0;
    background: #007bff;
    color: white;
    padding: 2px 6px;
    font-size: 12px;
    border-radius: 3px;
    z-index: 1000;
}

.progressive-debug .progressive-loaded::before {
    background: #28a745;
    content: attr(data-progressive) " ✓";
}

.progressive-debug .progressive-error::before {
    background: #dc3545;
    content: attr(data-progressive) " ✗";
}