.tooltip-popup {
    position: absolute;
    background: rgba(0, 0, 0, 0.88);
    color: #fff;
    font-size: 17px;
    font-weight: 600;
    padding: 8px 14px;
    border-radius: 6px;
    white-space: nowrap;
    z-index: 9999;
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 0.15s ease, transform 0.15s ease;
}

/* 말풍선 꼬리 */
.tooltip-popup::after {
    content: "";
    position: absolute;
    bottom: -6px;
    left: 50%;
    transform: translateX(-50%);
    border-width: 6px;
    border-style: solid;
    border-color: rgba(0, 0, 0, 0.88) transparent transparent transparent;
}

.tooltip-popup.show {
    opacity: 1;
    transform: translateY(0);
}

button:hover, button:focus {
    opacity: 0.85;
    box-shadow: 0 0 5px rgba(0,0,0,0.2);
}

a:hover, a:focus {
    opacity: 0.85;
    box-shadow: 0 0 5px rgba(0,0,0,0.2);
}

a {
    cursor: pointer;
}