html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow-x: auto;
    box-sizing: border-box;
    font-size: 13px !important;
    font-family: Arial, sans-serif !important;
}
body {
    -webkit-user-select: none; /* Safari */
    -moz-user-select: none; /* Firefox */
    -ms-user-select: none; /* Internet Explorer/Edge */
    user-select: none; /* Standard */
    font-family: Arial, sans-serif;
    line-height: 1.6;
}
#container{
    min-width: 1400px;
    margin: 0 auto;
    box-sizing: border-box; /* 패딩과 테두리를 포함한 너비 계산 */
}

.main_container {
    margin: auto;
    align-items: stretch; /* 요소의 높이를 동일하게 설정하여 균일하게 정렬 */
    padding-top:40px;
    height: 909px; /* Navbar 높이를 제외한 영역 */
    font-family: 'Arial', sans-serif;
}
/*  */
.sidebar {
    width: 300px;
    padding: 20px;
    padding-top: 40px;
    overflow-y: auto;
}

.sidebar h5 {
    font-size: 16px;
    margin-bottom: 20px;
    font-weight: bold;
}

.sidebar ul {
    list-style: none;
    padding-left: 0;
}

.sidebar ul li {
    margin-bottom: 5px;
}

/* Level 1 스타일 */
.sidebar ul li.level-1 {
    font-size: 14px;
    font-weight: bold;
    margin-top: 10px;
}

/* Level 2 스타일 */
.sidebar ul li.level-2 {
    padding-left: 20px;
    font-size: 13px;
    color: #555;
}
.content .level-3 {
    font-weight: bold;
    margin-top: 10px;
    margin-bottom: 5px;
    padding-left: 20px; 
}

.sidebar ul li a {
    text-decoration: none;
    color: #000;
    display: block;
    transition: background-color 0.3s ease;
}

.sidebar ul li a:hover {
    background-color: #f0f0f0;
}

/* 본문 스타일 */
.content {
    flex-grow: 1;
    padding: 30px;
    overflow-y: auto;
    line-height: 1.6;
    width: 900px;
}

.content p {
    font-size: 15px;
}

.discription p{
    padding-left: 20px;
}
.image-container{
    padding-left: 20px;
}

hr {
    border: 0;
    border-top: 1px solid #ddd;
    margin: 20px 0;
}

/* image */
.img-1-column{
    width:850px;
    padding-bottom: 10px;
}
.img-half-column{
    width:450px;
    padding-bottom: 10px;
}
img{
    width:100%;
    height:auto;
}
.img-example{
    padding-top: 10px;
    padding-left: 10px;
}

/* example */
.nav-btn {
    color: black !important;
}

.nav-btn.active {
    color: black !important; 
    font-weight: bold; 
}