.theme-option[data-theme-id="light"] .theme-preview {
    background: linear-gradient(135deg, #F8F9FA, #FFFFFF, #E9ECEF);
}

.theme-option[data-theme-id="dark"] .theme-preview {
    background: linear-gradient(135deg, #1A1A2E, #24243C, #2D2D44);
}