/* IGCert 좌측 서브메뉴 개선된 UX 디자인 - 느린 버전 */
/* 작성일: 2025년 8월 5일 */

/* 좌측 영역이 우측 컨텐츠보다 위에 표시되도록 설정 */
#left_area {
    position: relative !important;
    z-index: 999 !important;
    overflow: visible !important;
}

.left_snb {
    position: relative !important;
    z-index: 999 !important;
    overflow: visible !important;
}

/* 우측 영역의 z-index를 낮춤 */
#right_area {
    position: relative !important;
    z-index: 1 !important;
}

/* 메뉴 리스트 기본 설정 */
.left_snb ul {
    margin: 0;
    padding: 0;
    list-style: none;
    position: relative;
    z-index: 1000;
}

/* 상위 메뉴 스타일 - IGCert 브랜드 컬러 */
.left_snb > ul > li > a {
    background: #fff !important;
    color: #333 !important;
    border-bottom: 1px solid #e8e8e8 !important;
    transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94) !important;
    font-weight: 500 !important;
    position: relative !important;
    overflow: hidden !important;
}

/* 상위 메뉴 호버 효과 - 부드러운 전환 */
.left_snb > ul > li > a::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, #2563eb 0%, #1d4ed8 100%);
    transition: left 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    z-index: -1;
}

.left_snb > ul > li:hover > a::before {
    left: 0;
}

.left_snb > ul > li:hover > a {
    color: #fff !important;
    transform: translateX(3px);
}

/* 활성화된 상위 메뉴 */
.left_snb > ul > li.on > a {
    background: #1e40af !important;
    color: #fff !important;
    font-weight: 600 !important;
    box-shadow: 0 2px 4px rgba(30, 64, 175, 0.3);
}

/* 하위 메뉴가 있는 항목 표시 - 부드러운 아이콘 */
.left_snb li.has_sub > a,
#snb li.has_sub > a {
    position: relative;
    padding-right: 35px !important;
}

.left_snb li.has_sub > a::after,
#snb li.has_sub > a::after {
    content: "";
    position: absolute;
    right: 15px;
    top: 50%;
    width: 8px;
    height: 8px;
    border-right: 2px solid #999;
    border-bottom: 2px solid #999;
    transform: translateY(-50%) rotate(45deg);
    transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.left_snb li.has_sub:hover > a::after,
#snb li.has_sub:hover > a::after {
    transform: translateY(-50%) rotate(225deg);
    border-color: #fff;
}

.left_snb li.has_sub.on > a::after {
    border-color: #fff !important;
}

/* 하위 메뉴 컨테이너 - 부드러운 슬라이드 효과 */
.left_snb ul.sub_menu,
.left_snb .sub_menu,
#snb ul.sub_menu,
#snb .sub_menu,
.snb_menu ul.sub_menu,
.snb_menu .sub_menu {
    max-height: 0 !important;
    overflow: hidden !important;
    position: relative !important;
    z-index: 9999 !important;
    background: #f8fafc !important;
    border-left: 3px solid #3b82f6 !important;
    margin: 0 !important;
    padding: 0 !important;
    list-style: none !important;
    transition: max-height 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                padding 0.4s ease !important;
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.05) !important;
}

/* 호버 시 하위 메뉴 표시 */
.left_snb li.has_sub:hover > ul.sub_menu,
.left_snb li:hover > ul.sub_menu,
#snb li.has_sub:hover > ul.sub_menu,
#snb li:hover > ul.sub_menu,
.snb_menu > li.has_sub:hover > ul.sub_menu,
.snb_menu > li:hover > ul.sub_menu {
    max-height: 1000px !important;
    padding: 8px 0 !important;
}

/* 하위 메뉴 아이템 스타일 */
.left_snb ul.sub_menu > li {
    margin: 0 !important;
    padding: 0 !important;
    opacity: 0;
    transform: translateX(-10px);
    animation: slideIn 0.4s ease forwards;
}

/* 순차적 애니메이션 */
.left_snb li.has_sub:hover ul.sub_menu > li:nth-child(1) { animation-delay: 0.15s; }
.left_snb li.has_sub:hover ul.sub_menu > li:nth-child(2) { animation-delay: 0.25s; }
.left_snb li.has_sub:hover ul.sub_menu > li:nth-child(3) { animation-delay: 0.35s; }
.left_snb li.has_sub:hover ul.sub_menu > li:nth-child(4) { animation-delay: 0.45s; }
.left_snb li.has_sub:hover ul.sub_menu > li:nth-child(5) { animation-delay: 0.55s; }

@keyframes slideIn {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 하위 메뉴 링크 스타일 */
.left_snb ul.sub_menu > li > a {
    display: block !important;
    padding: 12px 15px 12px 35px !important;
    color: #4b5563 !important;
    font-size: 0.875rem !important;
    text-decoration: none !important;
    border: none !important;
    background: transparent !important;
    font-weight: 400 !important;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94) !important;
    position: relative !important;
    border-bottom: 1px solid rgba(226, 232, 240, 0.5) !important;
}

.left_snb ul.sub_menu > li:last-child > a {
    border-bottom: none !important;
}

/* 하위 메뉴 링크 화살표 */
.left_snb ul.sub_menu > li > a::before {
    content: "";
    position: absolute;
    left: 18px;
    top: 50%;
    width: 4px;
    height: 4px;
    background: #94a3b8;
    border-radius: 50%;
    transform: translateY(-50%);
    transition: all 0.4s ease;
}

/* 하위 메뉴 호버 효과 */
.left_snb ul.sub_menu > li > a:hover {
    background: linear-gradient(90deg, rgba(59, 130, 246, 0.08) 0%, transparent 100%) !important;
    color: #1e40af !important;
    padding-left: 40px !important;
}

.left_snb ul.sub_menu > li > a:hover::before {
    width: 8px;
    background: #3b82f6;
    left: 20px;
}

/* 활성화된 하위 메뉴 */
.left_snb ul.sub_menu > li.on > a {
    background: rgba(59, 130, 246, 0.1) !important;
    color: #1e40af !important;
    font-weight: 500 !important;
}

.left_snb ul.sub_menu > li.on > a::before {
    width: 8px;
    height: 8px;
    background: #2563eb !important;
}

/* 상위 메뉴가 활성화된 경우 하위 메뉴 표시 */
.left_snb > ul > li.on > ul.sub_menu {
    max-height: 1000px !important;
    padding: 8px 0 !important;
}

.left_snb > ul > li.on ul.sub_menu > li {
    opacity: 1;
    transform: translateX(0);
}

/* 포커스 상태 접근성 개선 */
.left_snb a:focus {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
}

/* 모바일 대응 */
@media (max-width: 768px) {
    /* 모바일에서는 탭으로 작동 */
    .left_snb li.has_sub > a::after {
        width: 10px;
        height: 10px;
    }
    
    .left_snb ul.sub_menu {
        transition: max-height 0.4s ease !important;
    }
    
    /* 모바일에서 하위 메뉴 스타일 조정 */
    .left_snb ul.sub_menu {
        border-left: none !important;
        border-top: 2px solid #e5e7eb !important;
        background: #fafbfc !important;
    }
    
    .left_snb ul.sub_menu > li > a {
        padding: 14px 15px 14px 30px !important;
        font-size: 0.9rem !important;
    }
}

/* 다크모드 지원 (선택사항) */
@media (prefers-color-scheme: dark) {
    .left_snb > ul > li > a {
        background: #1f2937 !important;
        color: #e5e7eb !important;
        border-bottom: 1px solid #374151 !important;
    }
    
    .left_snb ul.sub_menu {
        background: #111827 !important;
        border-left-color: #60a5fa !important;
    }
    
    .left_snb ul.sub_menu > li > a {
        color: #9ca3af !important;
        border-bottom-color: rgba(55, 65, 81, 0.5) !important;
    }
}