/**
 * Veelearn Loading States CSS
 * Global loading overlay, button loading states, skeleton loaders
 */

/* Global Loading Overlay */
.global-loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    z-index: 10000;
    backdrop-filter: blur(4px);
}

.global-loading-overlay.active {
    display: flex;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-text {
    color: white;
    margin-top: 20px;
    font-size: 16px;
    font-weight: 500;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Button Loading States */
button[data-loading="true"] {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.btn-spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    margin-right: 8px;
    vertical-align: middle;
}

.btn-text {
    vertical-align: middle;
}

/* Skeleton Loaders */
.skeleton-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 16px;
}

.skeleton-card {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 8px;
    padding: 16px;
}

.skeleton-image {
    height: 120px;
    border-radius: 4px;
    margin-bottom: 12px;
}

.skeleton-title {
    height: 24px;
    border-radius: 4px;
    margin-bottom: 8px;
    width: 70%;
}

.skeleton-text {
    height: 16px;
    border-radius: 4px;
    margin-bottom: 6px;
    width: 100%;
}

.skeleton-text.short {
    width: 50%;
}

.skeleton-list-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 8px;
}

.skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    flex-shrink: 0;
}

.skeleton-content {
    flex: 1;
}

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

/* Dark mode support for skeleton loaders */
@media (prefers-color-scheme: dark) {
    .skeleton-card,
    .skeleton-list-item {
        background: linear-gradient(90deg, #2a2a2a 25%, #3a3a3a 50%, #2a2a2a 75%);
        background-size: 200% 100%;
    }
}

/* Progress Indicator */
.progress-bar-container {
    width: 100%;
    height: 8px;
    background: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
    margin: 8px 0;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.progress-bar.indeterminate {
    width: 30%;
    animation: indeterminate 1.5s infinite ease-in-out;
}

@keyframes indeterminate {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(400%); }
}