.notation-toggle {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 25px;
}
.notation-btn {
    width: 44px; height: 44px;
    border-radius: 50%;
    border: 1px solid var(--item-border);
    background: var(--card-bg);
    font-family: 'Musical', sans-serif;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--text-sub);
    box-shadow: var(--card-shadow);
    font-feature-settings: normal;
}
.notation-btn:hover { transform: scale(1.1); color: var(--primary-blue); box-shadow: var(--card-hover-shadow); }
.notation-btn.active {
    background: var(--primary-blue) !important;
    color: var(--on-primary) !important;
    border-color: var(--primary-blue) !important;
    box-shadow: var(--card-shadow);
}