/* 기본 스타일 초기화 */
body {
    margin: 0;
    font-family: Arial, sans-serif;
}

/* 상단 바 스타일 */
.topbar {
    height: 50px;
    background-color: #333;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.menu-icon img {
    width: 30px;
    cursor: pointer;
}

.topbar-right a {
    color: white;
    text-decoration: none;
    margin-left: 20px;
}

.topbar-right a:hover {
    color: #ddd;
}

/* 좌측 내비게이션 바 스타일 */
.sidenav {
    height: 100%;
    width: 0;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: #111;
    overflow-x: hidden;
    transition: 0.5s;
    padding-top: 60px;
}

.sidenav a {
    padding: 8px 8px 8px 32px;
    text-decoration: none;
    font-size: 25px;
    color: #818181;
    display: block;
    transition: 0.3s;
}

.sidenav a:hover {
    color: #f1f1f1;
}

.sidenav .closebtn {
    position: absolute;
    top: 0;
    right: 25px;
    font-size: 36px;
}

/* 서브메뉴 스타일 */
.submenu {
    display: none;
    list-style-type: none;
    padding-left: 20px;
}

.submenu li a {
    font-size: 20px;
}

/* 메인 콘텐츠 영역 */
#main {
    transition: margin-left .5s;
    padding: 16px;
}