/* 부산 소개 사이드 네비게이션 스타일 */
#sideNav {
    width: 260px;
    position: sticky;
    top: 120px;
    height: fit-content;
    margin-top: 30px;
    margin-right: 50px;
    border: 1px solid #e6e6e6;
    border-radius: 8px;
    box-shadow: 0 2px 8px #0000001a;
    background: #fff;
    font-family: 'Noto Sans KR', sans-serif;
}

#sideNav h1 {
    background: linear-gradient(135deg, #d4f4ff 0%, #6dc5ff 100%);
    font-size: 24px;
    font-weight: 700;
    text-align: center;
    color: #0175c1;
    padding: 20px 15px;
    margin: 0;
    border-radius: 8px 8px 0 0;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.sideNavMenu {
    padding: 0;
}

.sideNavMenu > ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sideNavMenu > ul > li {
    border-bottom: 1px solid #f0f0f0;
}

.sideNavMenu > ul > li:last-child {
    border-bottom: none;
}

.sideNavMenuTitle {
    position: relative;
}

.sideNavMenuTitle > a {
    display: block;
    padding: 16px 20px;
    color: #121212;
    text-decoration: none;
    font-weight: 500;
    font-size: 18px;
    border-left: 4px solid transparent;
    transition: all 0.3s ease;
    background: #ffffff;
}

.sideNavMenuTitle > a:hover {
    background: #f8f9fa;
    color: #0175c1;
    border-left-color: #0175c1;
}

/* 부모 메뉴 active 상태 */
.sideNavMenu > ul > li.active .sideNavMenuTitle > a {
    background: #f0f7ff;
    color: #0175c1;
    border-left-color: #0175c1;
    font-weight: 600;
}

/* 드롭다운 버튼 스타일 */
.btnMenuDropDown {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    font-size: 0;
    width: 24px;
    height: 24px;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.btnMenuDropDown::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(45deg);
    width: 6px;
    height: 6px;
    border-right: 2px solid #666;
    border-bottom: 2px solid #666;
    transition: transform 0.3s ease;
}

.btnMenuDropDown:hover::before {
    border-color: #0175c1;
}

/* 서브메뉴가 열렸을 때 화살표 회전 */
.sideNavMenu > ul > li.active .btnMenuDropDown::before {
    transform: translate(-50%, -50%) rotate(-135deg);
}

/* 서브메뉴 스타일 */
.sideNavMenu ul ul {
    background: #f8f9fa;
    border-top: 1px solid #e6e6e6;
    display: none;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        max-height: 0;
    }
    to {
        opacity: 1;
        max-height: 200px;
    }
}

.sideNavMenu ul ul li {
    border-bottom: 1px solid #e6e6e6;
}

.sideNavMenu ul ul li:last-child {
    border-bottom: none;
}

.sideNavMenu ul ul li a {
    display: block;
    padding: 12px 20px 12px 40px;
    color: #555;
    text-decoration: none;
    font-size: 14px;
    font-weight: 400;
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
    position: relative;
}

.sideNavMenu ul ul li a::before {
    content: '•';
    position: absolute;
    left: 25px;
    color: #999;
    font-size: 12px;
}

.sideNavMenu ul ul li a:hover {
    background: #e8f4fd;
    color: #0175c1;
    border-left-color: #0175c1;
}

.sideNavMenu ul ul li.active a {
    background: #e8f4fd;
    color: #0175c1;
    border-left-color: #6daff2;
    font-weight: 500;
}

.sideNavMenu ul ul li.active a::before {
    color: #6daff2;
}

/* 외부 링크 아이콘 */
.sideNavMenu a[target="_blank"]::after {
    content: '↗';
    font-size: 12px;
    margin-left: 5px;
    opacity: 0.6;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    #sideNav {
        width: 100%;
        margin-bottom: 20px;
        position: static;
    }
    
    #sideNav h1 {
        font-size: 16px;
        padding: 15px;
    }
    
    .sideNavMenuTitle > a {
        padding: 14px 16px;
        font-size: 14px;
    }
    
    .btnMenuDropDown {
        right: 12px;
    }
    
    .sideNavMenu ul ul li a {
        padding: 10px 16px 10px 32px;
        font-size: 13px;
    }
}

/* 접근성 향상 */
.sideNavMenu a:focus {
    outline: 2px solid #6daff2;
    outline-offset: -2px;
}

.btnMenuDropDown:focus {
    outline: 2px solid #6daff2;
    outline-offset: 2px;
}

/* 스크롤바 스타일 (웹킷 브라우저) */
#sideNav::-webkit-scrollbar {
    width: 6px;
}

#sideNav::-webkit-scrollbar-track {
    background: #f1f1f1;
}

#sideNav::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 3px;
}

#sideNav::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}