/**
 * Performance optimization CSS for cmejansunwai25
 * Handles loading indicators and visual performance improvements
 */

/* Loading indicator */
#loading-indicator {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, #007bff, #28a745, #ffc107, #dc3545);
    background-size: 200% 100%;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
    z-index: 9999;
    animation: loading-gradient 2s linear infinite;
}

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

/* Optimize image loading */
img {
    max-width: 100%;
    height: auto;
}

img[data-src] {
    opacity: 0;
    transition: opacity 0.3s ease;
}

img[data-src].loaded {
    opacity: 1;
}

/* Lazy loading placeholder */
.img-placeholder {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading-shimmer 1.5s infinite;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
}

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

/* Optimize form performance */
form {
    will-change: transform;
}

button[type="submit"]:disabled,
input[type="submit"]:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    position: relative;
}

button[type="submit"]:disabled::after,
input[type="submit"]:disabled::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 2px solid transparent;
    border-top: 2px solid #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Optimize table performance */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

table {
    table-layout: fixed;
    width: 100%;
}

/* Optimize card performance */
.card {
    will-change: transform;
    backface-visibility: hidden;
}

.card:hover {
    transform: translateZ(0);
}

/* Optimize animations */
.animate__animated {
    animation-duration: 0.5s;
    animation-fill-mode: both;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Optimize scrolling */
html {
    scroll-behavior: smooth;
}

/* Critical CSS for above-the-fold content */
.hero-section,
.navbar,
.header {
    contain: layout style paint;
}

/* Skeleton loading for content */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading-shimmer 1.5s infinite;
}

.skeleton-text {
    height: 1em;
    margin-bottom: 0.5em;
    border-radius: 4px;
}

.skeleton-text:last-child {
    width: 80%;
}

/* Optimize modal performance */
.modal {
    will-change: transform, opacity;
}

.modal.fade {
    transition: opacity 0.15s linear;
}

/* Optimize dropdown performance */
.dropdown-menu {
    will-change: transform, opacity;
    transform: translateZ(0);
}

/* Performance hints for browsers */
.performance-hint {
    contain: layout style paint;
    will-change: transform;
}

/* Optimize grid layouts */
.row {
    contain: layout;
}

/* Reduce repaints */
.no-repaint {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* Optimize search inputs */
input[type="search"],
input[name*="search"] {
    will-change: contents;
}

/* Loading states */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    z-index: 1;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #007bff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 2;
}

/* Optimize print styles */
@media print {
    .no-print {
        display: none !important;
    }
    
    * {
        background: transparent !important;
        color: black !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }
}