/* ===== YEAR TIMELINE (NO BACKGROUND) ===== */
#yearControl {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

/* year buttons */
.year-pills {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.year-pill {
    padding: 6px 10px;
    border-radius: 8px;
    font-size: 0.75rem;
    cursor: pointer;
    text-align: center;
    user-select: none;
    background: rgba(255,255,255,0.85);
    box-shadow: 0 2px 6px rgba(0,0,0,.25);
}

.year-pill.active {
    background: #0d6efd;
    color: #fff;
}

/* horizontal slider */
#yearSlider {
    width: 300px;
    height: 8px;
    background: rgba(255,255,255,0.8);
}

#yearSlider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #0d6efd;
    cursor: pointer;
}