/**
 * Skeleton Loading & Smooth Page Transitions
 * Shows skeleton placeholder while page loads, then fades in content
 */

/* ============================================
   PAGE FADE-IN EFFECT
   ============================================ */

/* Content starts invisible, fades in when ready */
body:not(.page-ready) main,
body:not(.page-ready) .wsus__banner,
body:not(.page-ready) .wsus__modern_hero,
body:not(.page-ready) header,
body:not(.page-ready) footer,
body:not(.page-ready) section {
    opacity: 0;
}

body.page-ready main,
body.page-ready .wsus__banner,
body.page-ready .wsus__modern_hero,
body.page-ready header,
body.page-ready footer,
body.page-ready section {
    opacity: 1;
    transition: opacity 0.5s ease-out;
}

/* ============================================
   SKELETON OVERLAY
   ============================================ */

.skeleton-overlay {
    position: fixed;
    inset: 0;
    background: #f8fafc;
    z-index: 9998;
    display: flex;
    flex-direction: column;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s ease-out, visibility 0.3s ease-out;
}

.skeleton-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* Skeleton header */
.skeleton-header {
    height: 80px;
    background: #ffffff;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    align-items: center;
    padding: 0 20px;
    gap: 20px;
}

.skeleton-logo {
    width: 50px;
    height: 50px;
    border-radius: 8px;
    background: linear-gradient(90deg, #e2e8f0 25%, #f1f5f9 50%, #e2e8f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.skeleton-nav {
    display: flex;
    gap: 16px;
    flex: 1;
}

.skeleton-nav-item {
    width: 60px;
    height: 12px;
    border-radius: 6px;
    background: linear-gradient(90deg, #e2e8f0 25%, #f1f5f9 50%, #e2e8f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

/* Skeleton content */
.skeleton-content {
    flex: 1;
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.skeleton-hero {
    height: 200px;
    border-radius: 16px;
    background: linear-gradient(90deg, #e2e8f0 25%, #f1f5f9 50%, #e2e8f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.skeleton-section {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.skeleton-title {
    width: 40%;
    height: 24px;
    border-radius: 8px;
    background: linear-gradient(90deg, #e2e8f0 25%, #f1f5f9 50%, #e2e8f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.skeleton-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
}

.skeleton-card {
    height: 180px;
    border-radius: 12px;
    background: linear-gradient(90deg, #e2e8f0 25%, #f1f5f9 50%, #e2e8f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

/* Mobile bottom nav skeleton */
.skeleton-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 70px;
    background: #ffffff;
    border-top: 1px solid #e2e8f0;
    display: none;
    justify-content: space-around;
    align-items: center;
    padding: 0 16px;
}

@media (max-width: 991px) {
    .skeleton-bottom-nav {
        display: flex;
    }

    .skeleton-nav {
        display: none;
    }
}

.skeleton-nav-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: linear-gradient(90deg, #e2e8f0 25%, #f1f5f9 50%, #e2e8f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

/* Shimmer animation */
@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}

/* ============================================
   LOADING PROGRESS BAR
   ============================================ */

.page-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, #3b82f6, #8b5cf6, #ec4899);
    z-index: 99999;
    width: 0;
    transition: width 0.2s ease;
}

.page-progress.loading {
    width: 30%;
    animation: progressPulse 1s ease-in-out infinite;
}

.page-progress.complete {
    width: 100%;
    transition: width 0.15s ease, opacity 0.2s ease 0.15s;
    opacity: 0;
}

@keyframes progressPulse {

    0%,
    100% {
        width: 30%;
    }

    50% {
        width: 70%;
    }
}

/* ============================================
   SLICK SLIDER - PREVENT FLASH
   ============================================ */

.slick-slider:not(.slick-initialized) {
    visibility: hidden;
    min-height: 100px;
}

.slick-slider.slick-initialized {
    visibility: visible;
}

/* ============================================
   IMAGES
   ============================================ */

img {
    max-width: 100%;
    height: auto;
}

/* ============================================
   MOBILE OPTIMIZATIONS
   ============================================ */

@media (max-width: 991px) {

    .wsus__mobile_nav,
    .main_menu {
        transform: translateZ(0);
        backface-visibility: hidden;
        -webkit-backface-visibility: hidden;
    }

    html {
        scroll-behavior: smooth;
        -webkit-overflow-scrolling: touch;
    }

    input,
    select,
    textarea {
        font-size: 16px !important;
    }

    a,
    button {
        touch-action: manipulation;
    }
}

/* ============================================
   REDUCED MOTION
   ============================================ */

@media (prefers-reduced-motion: reduce) {

    .skeleton-logo,
    .skeleton-nav-item,
    .skeleton-hero,
    .skeleton-title,
    .skeleton-card,
    .skeleton-nav-icon {
        animation: none;
    }

    .page-progress,
    .skeleton-overlay {
        transition: none;
    }

    body.page-ready main,
    body.page-ready .wsus__banner,
    body.page-ready .wsus__modern_hero,
    body.page-ready header,
    body.page-ready footer,
    body.page-ready section {
        transition: none;
    }
}