body {
    background-color: #f8f9fa;
}

.kana-cell {
    position: relative;
    font-size: 2rem;
    padding: 14px 0;
    text-align: center;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    border-radius: 8px;
}

.kana-cell:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    background-color: white;
}

/* Romaji overlay */
.kana-romaji {
    position: absolute;
    bottom: 4px;
    left: 0;
    right: 0;
    font-size: 0.75rem;
    color: #6c757d;
    opacity: 0;
    transition: opacity 0.2s ease;
}

/* Show romaji on hover */
.kana-cell:hover .kana-romaji {
    opacity: 1;
}

/* Show romaji on mobile tap */
.kana-cell.active .kana-romaji {
    opacity: 1;
}

/* Slightly more compact rows */
.kana-row {
    margin-bottom: 6px;
}