.fz-piano {
    display: flex;
    justify-content: center;
    background: #2d3748;
    padding: 8px 8px 16px;
    border-radius: 0.5rem;
    max-width: 600px;
    margin: 0 auto;
}
.fz-piano-key {
    flex: 1;
    min-height: 180px;
    background: #fff;
    border: 1px solid #ccc;
    border-radius: 0 0 6px 6px;
    cursor: pointer;
    transition: transform 0.1s, background-color 0.1s;
    user-select: none;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    padding-bottom: 10px;
    position: relative;
}
.fz-piano-key:hover {
    background-color: #f0f0f0;
}
.fz-piano-key.active {
    transform: translateY(3px);
    background-color: #e2e8f0;
}
.fz-piano-key[data-note="C4"] { border-top: 6px solid #dc3545; }
.fz-piano-key[data-note="D4"] { border-top: 6px solid #fd7e14; }
.fz-piano-key[data-note="E4"] { border-top: 6px solid #ffc107; }
.fz-piano-key[data-note="F4"] { border-top: 6px solid #198754; }
.fz-piano-key[data-note="G4"] { border-top: 6px solid #0d6efd; }
.fz-piano-key[data-note="A4"] { border-top: 6px solid #6f42c1; }
.fz-piano-key[data-note="B4"] { border-top: 6px solid #d63384; }
.fz-piano-key[data-note="C5"] { border-top: 6px solid #fd7e14; }

.fz-sfx-btn {
    border: none;
    border-radius: 0.5rem;
    padding: 1rem 0.75rem;
    cursor: pointer;
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    transition: transform 0.15s;
}
.fz-sfx-btn:hover {
    transform: translateY(-3px);
    filter: brightness(1.1);
}
.fz-sfx-btn:active {
    transform: translateY(1px);
}