.research_interests {
    cursor: pointer;
    font-weight: bold;
    border-bottom: 1px dashed currentColor;
    transition: opacity 0.2s ease;
}

.research_interests:hover {
	color: #575757;
}

.research_interests.fading {
    opacity: 0;
}

.ri_popup {
    position: absolute;
    background: #fff;
    border: 1px solid #ccc;
    border-radius: 2px;
    padding: 0.6rem 0.8rem;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
    z-index: 1000;
    width: 240px;
}

.ri_popup .ri_date {
    font-size: 0.85rem;
    color: #666;
    text-align: center;
}

.ri_popup input[type="range"] {
    width: 100%; margin: 0; padding: 0;
}