* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
            overflow-x: hidden;
            background: white;
            
            /* [핵심] Sticky Footer를 위한 Flex 설정 */
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        /* [추가] 콘텐츠 래퍼: 남은 공간을 차지하여 푸터를 바닥으로 밈 */
        .page-wrapper {
            flex: 1;
            position: relative;
            background: linear-gradient(to bottom right, #eff6ff, #ffffff, #eff6ff);
            z-index: 1;
            padding-top: 80px; /* 헤더 높이만큼 여백 확보 */
        }

        /* ========== HEADER / NAVIGATION ========== */
        header {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            transition: all 0.3s ease;
            background: transparent;
        }

        header.scrolled {
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(12px);
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            border-bottom: 1px solid #dbeafe;
        }

        .header-inner {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 16px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 80px;
        }

        /* 로고 */
        .logo {
            display: flex;
            align-items: center;
            margin-left: -100px;
        }

        .logo-image {
            height: 100px;
            transition: transform 0.3s ease;
        }

        .logo:hover .logo-image {
            transform: scale(1.02);
        }

        /* 네비게이션 */
        nav {
            display: flex;
            align-items: center;
            gap: 32px;
        }

        nav > a {
            position: relative;
            color: #374151;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s ease;
            display: flex;
            align-items: center;
            gap: 4px;
        }

        nav > a:hover,
        nav > a.active {
            color: #1e3a8a;
        }

        /* 밑줄 애니메이션 */
        nav > a::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(to right, #1e3a8a, #1e40af);
            transition: width 0.3s ease;
        }

        nav > a:hover::after,
        nav > a.active::after {
            width: 100%;
        }

        /* 드롭다운 컨테이너 */
        .nav-item-with-dropdown {
            position: relative;
        }

        .nav-link {
            display: flex;
            align-items: center;
            gap: 4px;
            cursor: pointer;
        }

        .chevron-icon {
            width: 16px;
            height: 16px;
            transition: transform 0.3s ease;
        }

        .nav-item-with-dropdown:hover .chevron-icon {
            transform: rotate(180deg);
        }

        /* 드롭다운 메뉴 */
        .dropdown-menu {
            position: absolute;
            top: calc(100% + 8px);
            left: 0;
            width: 192px;
            background: white;
            border: 1px solid #dbeafe;
            border-radius: 8px;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
            padding: 8px 0;
            opacity: 0;
            visibility: hidden;
            transform: translateY(-10px);
            transition: all 0.3s ease;
        }

        .nav-item-with-dropdown:hover .dropdown-menu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .dropdown-menu a {
            display: block;
            padding: 8px 16px;
            color: #374151;
            text-decoration: none;
            transition: all 0.2s ease;
        }

        .dropdown-menu a:hover {
            background: #eff6ff;
            color: #1e3a8a;
        }

        /* 모바일 메뉴 버튼 */
        .mobile-menu-button {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
        }

        .mobile-menu-button svg {
            width: 24px;
            height: 24px;
            color: #1e3a8a;
        }

        /* 모바일 메뉴 */
        .mobile-menu {
            display: none;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            border-top: 1px solid #dbeafe;
            padding: 16px;
        }

        .mobile-menu.active {
            display: block;
        }

        .mobile-menu a {
            display: block;
            padding: 12px 16px;
            color: #374151;
            text-decoration: none;
            border-radius: 8px;
            transition: all 0.2s ease;
            margin-bottom: 4px;
        }

        .mobile-menu a:hover,
        .mobile-menu a.active {
            background: #eff6ff;
            color: #1e3a8a;
        }

        .mobile-submenu {
            padding-left: 16px;
            margin-top: 4px;
        }

        .mobile-submenu a {
            font-size: 0.875rem;
            color: #6b7280;
        }

        /* ========== 섹션 컨테이너 (page-wrapper 내부) ========== */
        #professor {
            padding: 80px 0;
            background: transparent; /* 배경은 page-wrapper가 담당 */
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 16px;
        }

        /* ========== 헤더 ========== */
        .section-header {
            text-align: center;
            margin-bottom: 44px;
        }

        .section-title {
            font-size: 2.25rem;
            color: #1e3a8a;
            margin-bottom: 16px;
            font-weight: bold;
        }

        .section-subtitle {
            color: #6b7280;
            font-size: 1.125rem;
        }

        /* ========== 프로필 카드 ========== */
        .profile-card {
            max-width: 896px;
            margin: 0 auto;
            background: linear-gradient(to bottom right, #eff6ff, #ffffff);
            border-radius: 12px;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
            padding: 48px;
            transition: all 0.3s ease;
        }

        .profile-card:hover {
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
        }

        /* ========== 프로필 상단 (이미지 + 기본 정보) ========== */
        .profile-top {
            display: flex;
            flex-direction: column;
            gap: 32px;
            margin-bottom: 24px;
        }

        @media (min-width: 768px) {
            .profile-top {
                flex-direction: row;
            }
        }

        .profile-image-wrapper {
            flex-shrink: 0;
        }

        .profile-image {
            width: 160px;
            height: auto;
            object-fit: cover;
            border-radius: 8px;
        }

        .profile-info {
            flex-grow: 1;
        }

        .profile-name {
            font-size: 1.5rem;
            color: #1e3a8a;
            margin-bottom: 8px;
            font-weight: bold;
        }

        .profile-position {
            color: #6b7280;
            margin-bottom: 12px;
        }

        .profile-department {
            color: #6b7280;
        }

        /* ========== 섹션 디바이더 ========== */
        .section-divider {
            border-top: 4px double rgba(30, 58, 138, 0.3);
            padding-top: 24px;
            margin-top: 24px;
        }

        .section-divider:first-of-type {
            margin-top: 0;
        }

        /* ========== 섹션 제목 ========== */
        .subsection-title {
            color: #1e3a8a;
            font-size: 1.125rem;
            margin-bottom: 12px;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .subsection-title svg {
            width: 20px;
            height: 20px;
        }

        /* ========== 연구 분야 리스트 ========== */
        .research-list {
            list-style: none;
            padding: 0;
        }

        .research-list li {
            color: #374151;
            margin-bottom: 8px;
            line-height: 1.6;
        }

        /* ========== 경력 리스트 ========== */
        .career-list {
            list-style: none;
            padding: 0;
        }

        .career-list li {
            margin-bottom: 12px;
        }

        .career-date {
            font-weight: 600;
            color: #1e3a8a;
            margin-bottom: 4px;
        }

        .career-detail {
            color: #374151;
            line-height: 1.6;
        }

        /* ========== 연락처 ========== */
        .contact-list {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .contact-item {
            display: flex;
            align-items: center;
            gap: 12px;
            color: #374151;
            text-decoration: none;
            transition: color 0.2s ease;
        }

        .contact-item svg {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
        }

        a.contact-item:hover {
            color: #1e3a8a;
        }

        /* ========== FOOTER (스타일은 유지하되 위치는 flex로 제어됨) ========== */
        /* 만약 footer.css를 따로 쓰지 않고 여기에 포함시킨다면 아래 내용을 사용하세요. */
        /* footer {
            background: linear-gradient(to bottom right, #111827, #172554, #1e3a8a);
            color: white;
            padding: 24px 0;
            position: relative;
            overflow: hidden;
            margin-top: auto; 
        } 
        ... (나머지 푸터 스타일)
        */
       
        /* ========== 반응형 ========== */
        @media (max-width: 768px) {
            .page-wrapper {
                padding-top: 60px; /* 모바일 헤더 높이에 맞춤 (필요시 조정) */
            }

            #professor {
                padding: 40px 0;
            }

            .section-header {
                margin-bottom: 40px;
            }

            .section-title {
                font-size: 2rem;
            }

            .profile-card {
                padding: 32px 24px;
            }

            .profile-name {
                font-size: 1.25rem;
            }

            .section-divider {
                padding-top: 16px;
                margin-top: 16px;
            }
        }

        @media (max-width: 640px) {
            .profile-card {
                padding: 24px 16px;
            }

            .section-title {
                font-size: 1.75rem;
            }
        }

/* ========== 반응형 (모바일) ========== */
@media (max-width: 768px) {
    
    /* [핵심 수정] 데스크탑 메뉴(긴 줄)를 숨깁니다 */
    nav {
        display: none;
    }

    /* [핵심 수정] 햄버거 버튼을 화면에 표시합니다 */
    .mobile-menu-button {
        display: block; /* 기존 none에서 block으로 변경 */
        padding: 4px;
    }

    /* 헤더 높이 및 여백 조정 */
    .header-inner {
        height: 60px;
        padding: 0 12px;
    }

    /* 로고 위치 초기화 (PC용 음수 마진 제거) */
    .logo {
        margin-left: 0;
    }

    /* 로고 이미지 크기 모바일에 맞게 축소 */
    .logo-image {
        height: 40px;
        width: auto;
    }
    

}