.filter-group {
    margin-bottom: 1.5rem;
}

.filter-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.filter-options {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 0.5rem;
}

.filter-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-button {
    padding: 0.5rem 1rem;
    margin-top: 1rem;
    margin-right: 0.5rem;
    cursor: pointer;
}

.filter-button.reset {
    background-color: #f0f0f0;
}

.project-thumbnail {
    overflow: hidden;
    border-radius: 4px;
}

.project-thumbnail img {
    transition: transform 0.3s ease;
}

.project-thumbnail:hover img {
    transform: scale(1.05);
}

.project-region {
    margin-top: 1rem;
}

.project-region a {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background-color: #f0f0f0;
    border-radius: 4px;
    margin-right: 0.5rem;
    font-size: 0.8rem;
}

.loading-spinner {
    border: 3px solid rgba(0, 0, 0, 0.1);
    border-top: 3px solid #007cba;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 2rem auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}