/**
 * MTG Collection Manager - Skeleton Loader Styles
 * Loading placeholders for better perceived performance
 */

/* ============================================================
   BASE SKELETON
   ============================================================ */

.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-bg-card) 0%,
        var(--color-bg-card-hover) 50%,
        var(--color-bg-card) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s ease-in-out infinite;
    border-radius: var(--radius-sm);
}

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

/* ============================================================
   SKELETON VARIANTS
   ============================================================ */

.skeleton-text {
    height: 1em;
    margin-bottom: 0.5rem;
}

.skeleton-text-sm {
    height: 0.8em;
    width: 60%;
}

.skeleton-title {
    height: 2rem;
    width: 200px;
    margin-bottom: 1rem;
}

.skeleton-card {
    height: 120px;
    border-radius: var(--radius-md);
}

.skeleton-stat {
    height: 80px;
    border-radius: var(--radius-md);
}

.skeleton-chart {
    height: 300px;
    border-radius: var(--radius-md);
}

.skeleton-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border-bottom: 1px solid var(--color-border);
}

.skeleton-avatar {
    width: 40px;
    height: 56px;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.skeleton-content {
    flex: 1;
}

.skeleton-btn {
    width: 100px;
    height: 36px;
    border-radius: var(--radius-sm);
}

/* ============================================================
   SKELETON CONTAINERS
   ============================================================ */

.skeleton-loading {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Grid of skeleton cards */
.skeleton-grid {
    display: grid;
    gap: var(--spacing-lg);
}

.skeleton-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.skeleton-grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1024px) {
    .skeleton-grid-4, .skeleton-grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .skeleton-grid-4, .skeleton-grid-3 {
        grid-template-columns: 1fr;
    }
}

/* ============================================================
   CHART LOADING SKELETON
   ============================================================ */

.chart-skeleton {
    position: relative;
    overflow: hidden;
}

.chart-skeleton::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60%;
    background: linear-gradient(
        180deg,
        transparent 0%,
        rgba(212, 175, 55, 0.05) 100%
    );
}

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

@media (prefers-reduced-motion: reduce) {
    .skeleton {
        animation: none;
        background: var(--color-bg-card-hover);
    }
}