/**
 * Skeleton Loading CSS
 * Mejora UX durante la carga de contenido AJAX
 */

/* Animación de pulso para skeletons */
@keyframes skeleton-pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.4;
    }
}

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

/* Base skeleton */
.skeleton {
    background: linear-gradient(90deg, #e5e7eb 25%, #f3f4f6 50%, #e5e7eb 75%);
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite;
    border-radius: 4px;
}

.skeleton-pulse {
    animation: skeleton-pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Skeleton Card para anuncios */
.skeleton-card {
    background: white;
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.skeleton-card .skeleton-image {
    height: 12rem;
    background: linear-gradient(90deg, #e5e7eb 25%, #f3f4f6 50%, #e5e7eb 75%);
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite;
}

.skeleton-card .skeleton-content {
    padding: 1rem;
}

.skeleton-card .skeleton-line {
    height: 0.75rem;
    background: linear-gradient(90deg, #e5e7eb 25%, #f3f4f6 50%, #e5e7eb 75%);
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.skeleton-card .skeleton-line.short {
    width: 60%;
}

.skeleton-card .skeleton-line.medium {
    width: 80%;
}

.skeleton-card .skeleton-line.tiny {
    width: 40%;
    height: 0.5rem;
}

/* Grid de skeletons */
.skeleton-grid {
    display: grid;
    gap: 1.5rem;
}

/* Responsive grid igual que el de anuncios */
@media (min-width: 640px) {
    .skeleton-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .skeleton-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

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

/* Loading overlay para el grid existente */
.grid-loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    border-radius: 0.5rem;
}

.grid-loading-overlay .loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.grid-loading-overlay .loading-spinner i {
    font-size: 2rem;
    color: #ec4899;
}

.grid-loading-overlay .loading-spinner span {
    font-size: 0.875rem;
    color: #6b7280;
}

/* Container con posición relativa para el overlay */
.grid-container-relative {
    position: relative;
}

/* Botón de carga mejorado */
.btn-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 1rem;
    height: 1rem;
    top: 50%;
    left: 50%;
    margin-left: -0.5rem;
    margin-top: -0.5rem;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* Fade in para contenido nuevo */
.fade-in-content {
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Progress bar para carga */
.loading-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #ec4899, #8b5cf6);
    transform-origin: left;
    z-index: 9999;
    animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
    0% {
        transform: scaleX(0);
    }
    50% {
        transform: scaleX(0.7);
    }
    100% {
        transform: scaleX(1);
    }
}