.perspective-tag {
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    background-color: #f0f0f0;
    color: #666;
    font-size: 12px;
    transition: background-color 0.2s, color 0.2s;
}

.perspective-tag:hover {
    background-color: #e0e0e0;
}

input[type="radio"]:checked + .perspective-tag {
    background-color: #d0d0d0;
    color: #333;
    font-weight: 500;
}

.reference-source-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 6px;
    border-radius: 3px;
    background-color: #e8f4f8;
    color: #555;
    font-size: 11px;
    line-height: 1.2;
}

.reference-source-tag .close-btn {
    cursor: pointer;
    padding: 0;
    margin: 0;
    width: 14px;
    height: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: transparent;
    color: #666;
    font-size: 14px;
    transition: background-color 0.2s, color 0.2s;
}

.reference-source-tag .close-btn:hover {
    background-color: rgba(0, 0, 0, 0.1);
    color: #333;
}