.preview-container {
    display: none;
    margin-top: 30px;
    padding: 30px;
    border-radius: var(--border-radius-md);
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
    animation: fadeIn 0.5s ease;
    transition: all 0.4s ease;
    opacity: 1;
    transform: scale(1);
    border: 1px solid var(--border-color);
}

.preview-container.hidden {
    opacity: 0;
    transform: scale(0.95);
    height: 0;
    padding: 0;
    margin: 0;
    overflow: hidden;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    padding: 1rem;
    max-height: 400px;
    overflow-y: auto;
    background: var(--bg-secondary);
    border-radius: 8px;
    margin-top: 1rem;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: all 0.4s ease;
}

.preview-grid.hidden {
    opacity: 0;
    transform: scale(0.95);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.preview-card {
    position: relative;
    background: var(--bg-primary);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
    opacity: 1;
    transform: scale(1);
}

.preview-card.removing {
    opacity: 0;
    transform: scale(0.8);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.preview-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.thumbnail-container {
    position: relative;
    width: 100%;
    padding-top: 75%; /* 4:3 Aspect Ratio */
    overflow: hidden;
    background: var(--bg-secondary);
}

.preview-thumbnail {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform 0.3s ease;
    background: var(--bg-primary);
}

.preview-card:hover .preview-thumbnail {
    transform: scale(1.05);
}

.file-info {
    padding: 0.75rem;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.file-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding-right: 1rem;
}

.file-size {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.file-size::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 4px;
    background: currentColor;
    border-radius: 50%;
    opacity: 0.5;
}

.remove-file {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--overlay-color);
    color: var(--text-primary);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    line-height: 1;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 2;
}

.preview-card:hover .remove-file {
    opacity: 1;
}

.remove-file:hover {
    background: var(--error-color);
    color: white;
    transform: scale(1.1);
}

/* Scrollbar Styles */
.preview-grid::-webkit-scrollbar {
    width: 8px;
}

.preview-grid::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

.preview-grid::-webkit-scrollbar-thumb {
    background: var(--text-secondary);
    border-radius: 4px;
}

.preview-grid::-webkit-scrollbar-thumb:hover {
    background: var(--text-primary);
}

.preview-container .file-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: 6px;
    margin-bottom: 1rem;
}

.preview-container .action-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.preview-container .btn {
    flex: 1;
    min-width: 120px;
    transition: all 0.3s ease;
}

.preview-container .btn:hover {
    transform: translateY(-1px);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .preview-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        max-height: 300px;
    }
    
    .preview-container .action-buttons {
        flex-direction: column;
    }
    
    .preview-container .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .preview-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 0.5rem;
        padding: 0.5rem;
    }
    
    .file-info {
        padding: 0.5rem;
    }
    
    .file-name {
        font-size: 0.75rem;
    }
    
    .file-size {
        font-size: 0.625rem;
    }
    
    .preview-container {
        padding: 0.75rem;
    }
}