.header {
    z-index: 100000;
    margin: 0;
    line-height: normal;
    width: 1920px;
    height: 80px;
    position: fixed;
    top: 0;
    backdrop-filter: blur(20px);
    background-color: rgba(244, 244, 245, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.14);
    box-sizing: border-box;
    overflow: visible; /* 드롭다운이 헤더 밖으로 보이도록 수정 */
    text-align: left;
    font-size: 16px;
    color: #292a2d;
    font-family: Roboto;
}

/* 헤더 로고 ===================================================== */
.header-logo {
    position: absolute;
    width: 81px;
    height: 28px;
    top: 26px;
    left: 27px;
    font-size: 22px;
    line-height: 28px;
    font-weight: 600;
    color: #292a2d;
    text-align: left;
    display: inline-block;
}

/* 헤더 네비게이션 ===================================================== */
.header-nav {
    position: absolute;
    width: 491px;
    height: 44px;
    top: 18px;
    left: 714px;
    box-shadow: -1.8583999872207642px -1.7319999933242798px 12px -8px rgba(0, 0, 0, 0.1), 2.146451950073242px 2.000459909439087px 9.24px rgba(255, 255, 255, 0.13) inset, 1.2172520160675049px 1.1344599723815918px 4.62px rgba(255, 255, 255, 0.13) inset;
    backdrop-filter: blur(15.16px);
    border-radius: 40px;
    background-color: #dbdcdf;
    border: 1px solid rgba(255, 255, 255, 0.35);
    box-sizing: border-box;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    padding: 4px 5px;
    mix-blend-mode: normal;
    color: #5a5c63;
    text-align: left;
}

.header-nav-link-01 {
    width: 160px;
    border-radius: 8px;
    height: 36px;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    padding: 12px 0px;
    box-sizing: border-box;
    cursor: pointer;
}

.header-nav-link-02 {
    width: 160px;
    border-radius: 8px;
    height: 36px;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    padding: 12px 0px;
    box-sizing: border-box;
    cursor: pointer;
}

.header-nav-link-text {
    position: relative;
    line-height: 24px;
}

/* 헤더 로그인 ===================================================== */
.header-login {
    position: absolute;
    width: 110px;
    height: 36px;
    top: 18px;
    left: 1782px;
    backdrop-filter: blur(20px);
    border-radius: 8px;
    background-color: #46474c;
    border: 1px solid #37383c;
    box-sizing: border-box;
    text-align: center;
    font-size: 16px;
    color: #fff;
    font-family: Roboto;
}

.header-login-text {
    position: relative;
    top: 6px;
    width: 100%;
}

/* 헤더 다크모드 ===================================================== */
.header-darkmode {
    position: absolute;
    top: 24px;
    left: 1682px;
    width: 24px;
    height: 24px;
    cursor: pointer;
}

.header-darkmode-icon {
    overflow: hidden;
}

/* 헤더 사용자 ===================================================== */
.header-user-container {
    position: absolute;
    width: 36px;
    height: 36px;
    top: 18px;
    left: 1726px;
    cursor: pointer;
}

.header-user-icon {
    width: 36px;
    height: 36px;
}

/* User Dropdown Menu ===================================================== */
.header-user-dropdown {
    display: none;
    position: absolute;
    top: 54px; /* header-user-icon height + some margin */
    right: 0;
    background-color: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    min-width: 200px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    padding: 8px 0;
    z-index: 99999;
}

.header-user-dropdown.show {
    display: block;
}

.header-dropdown-item {
    display: block;
    padding: 10px 16px;
    color: #333;
    text-decoration: none;
    font-size: 14px;
}

.header-dropdown-item:hover {
    background-color: #f1f1f1;
}

.header-dropdown-divider {
    height: 1px;
    margin: 8px 0;
    overflow: hidden;
    background-color: #e5e5e5;
}

.header-dropdown-header {
    padding: 10px 16px;
}

.header-user-name {
    font-weight: 600;
    font-size: 15px;
}

/* Active navigation link marker */
.header-nav-link-02 {
    position: relative;
}

.nav-active-mark-01 {
    position: absolute;
    left: 17%;
    top: 50%;
    transform: translate(-50%, -50%);
}
.nav-active-mark-02 {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}
.nav-active-mark-03 {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.header-user-institution {
    font-size: 12px;
    color: #666;
}