.menu-group {
    margin: 4px 0;
}

.menu-group-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 16px;
    cursor: pointer;
    user-select: none;
    transition: all 0.2s;
    color: #202124;
    font-size: 0.95em;
    font-weight: 500;
    border-radius: 0 24px 24px 0;
    margin-right: 8px;
    letter-spacing: 0.2px;
}

.menu-group-title:hover {
    background: rgba(32, 33, 36, 0.039);
}

.menu-group-title i {
    font-size: 0.9em;
    color: #5f6368;
    transition: all 0.2s ease;
}

.menu-group-title.collapsed i {
    transform: rotate(90deg);
}

.menu-group-title:not(.collapsed) i {
    transform: rotate(0deg);
}

.menu-group-content {
    overflow: hidden;
    transition: height 0.2s ease-out;
    height: auto;
    display: block;
}

.menu-group-content.collapsed {
    height: 0;
    display: none;
}

.menu-group-content button {
    width: 100%;
    text-align: left;
    padding: 12px 16px 12px 50px;
    border: none;
    background: transparent;
    color: #3c4043;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.875em;
    border-radius: 0 24px 24px 0;
    margin: 2px 8px 2px 0;
    position: relative;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 400;
    letter-spacing: 0.2px;
    box-shadow: 0 0 0 0 rgba(26, 115, 232, 0);
}

.menu-group-content button:hover {
    background: rgba(32, 33, 36, 0.059);
    color: #1967d2;
    box-shadow: 0 1px 3px rgba(60, 64, 67, 0.05);
}

.menu-group-content button.active {
    background: #e8f0fe;
    color: #1a73e8;
    font-weight: 500;
    position: relative;
    box-shadow: 0 1px 3px rgba(26, 115, 232, 0.15);
}

/* 오디오 플레이어 특별 스타일 */
#audioPlayer .menu-group-content {
    padding: 0 16px;
}

.audio-container {
    background: white;
    border-radius: 8px;
    padding: 12px;
    width: 100%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.08);
    margin: 0;
}

/* 모바일 대응 */
@media (max-width: 768px) {
    .menu-group-title {
        padding: 12px 16px;
    }
    
    .menu-group-content button {
        padding: 12px 16px 12px 50px;
    }
    
    #bgmPlayer {
        padding: 12px;
    }
    
    .audio-container {
        max-width: none;
    }
}

/* 메뉴 구분선 */
.menu-group:not(:last-child) {
    border-bottom: 1px solid rgba(0,0,0,0.08);
    padding-bottom: 8px;
    margin-bottom: 8px;
}

/* 메뉴 아이콘 스타일 */
.menu-group-title span {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* 활성화된 메뉴 그룹 스타일 */
.menu-group-title:has(+ .menu-group-content:not(.collapsed)) {
    color: #1a73e8;
}

.menu-group-title:has(+ .menu-group-content:not(.collapsed)) i {
    color: #1a73e8;
}

/* 메뉴 버튼 아이콘 스타일 */
.menu-group-content button::before {
    content: '';
    position: absolute;
    left: 20px;
    width: 20px;
    height: 20px;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    opacity: 0.7;
    transition: all 0.2s;
}

.menu-group-content button:hover::before {
    opacity: 0.9;
}

.menu-group-content button.active::before {
    opacity: 1;
}

/* 버튼 리플 효과 */
.menu-group-content button::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    background: rgba(26, 115, 232, 0.1);
    border-radius: 0 24px 24px 0;
    opacity: 0;
    transform: scale(0.8);
    transition: all 0.2s;
}

.menu-group-content button:active::after {
    opacity: 1;
    transform: scale(1);
    transition: all 0.1s;
}

/* 메뉴 그룹 제목 스타일 개선 */
.menu-group-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 16px;
    cursor: pointer;
    user-select: none;
    transition: all 0.2s;
    color: #202124;
    font-size: 0.95em;
    font-weight: 500;
    border-radius: 0 24px 24px 0;
    margin-right: 8px;
    letter-spacing: 0.2px;
}

.menu-group-title:hover {
    background: rgba(32, 33, 36, 0.039);
}

/* 구분선 스타일 개선 */
.menu-group:not(:last-child) {
    border-bottom: 1px solid rgba(0,0,0,0.08);
    padding-bottom: 8px;
    margin-bottom: 8px;
}

/* 호버 효과 부드럽게 */
.menu-group-content button,
.menu-group-title {
    transition: all 0.15s ease-in-out;
}

/* 아이콘 크기 및 색상 조정 */
.menu-group-title i {
    font-size: 0.9em;
    color: #5f6368;
    transition: all 0.2s ease;
}

/* 배경음악 플레이어 스타일 */
#bgmPlayer {
    padding: 0 16px 16px 16px;
    margin: 0 0 8px 0;
    border-bottom: 1px solid rgba(0,0,0,0.08);
}

.audio-container {
    background: white;
    border-radius: 8px;
    padding: 12px;
    width: 100%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.08);
    margin: 0;
}

/* 불필요한 스타일 제거 */
/* 아래 스타일을 삭제합니다 */
#bgmPlayer .menu-group-content,
#bgmPlayer .menu-group-title i {
    display: none;
}

/* 메뉴 토글 버튼 스타일 */
.menu-toggle {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1001;
    background: none;
    color: #333;
    border: none;
    padding: 1.2rem 1rem;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    width: auto;
}

/* 모바일 메뉴 스타일 */
@media (max-width: 768px) {
    .menu-toggle {
        display: inline-block;
        height: auto;
    }

    #menu {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        width: 280px;
        background: white;
        box-shadow: 2px 0 8px rgba(0,0,0,0.1);
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 1000;
        overflow-y: auto;
        padding-top: 50px;
    }

    #menu.menu-open {
        transform: translateX(0);
    }
}

/* 메뉴 배경 오버레이 */
@media (max-width: 768px) {
    .menu-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0,0,0,0.3);
        z-index: 999;
    }

    #menu.menu-open + .menu-overlay {
        display: block;
    }
}

/* 메뉴 그룹 첫번째 여백 제거 */
.menu-group:first-child {
    margin-top: 0;
    padding-top: 0;
}

/* 메뉴 그룹 전체 여백 조정 */
.menu-group {
    margin: 4px 0;
}

/* 메뉴 그룹 제목 패딩 조정 */
.menu-group-title {
    padding: 8px 16px;
}

/* 오디오 컨테이너 여백 조정 */
.audio-container {
    margin-top: 0;
}