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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    height: 100vh;
    overflow: hidden;
}

.container {
    display: flex;
    height: 100vh;
    background-color: #f5f5f5;
}

/* Styling untuk sidebar */
.sidebar {
    width: 300px;
    background-color: #fff;
    border-right: 1px solid #ddd;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.pdf-selector {
    padding: 0px;
    border-bottom: 1px solid #ddd;
}

.pdf-selector select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: #fff;
}

.toc {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
}

.toc h3 {
    margin-bottom: 15px;
    color: #333;
    font-size: 1.2em;
}

.toc ul {
    list-style: none;
}

.toc ul li {
    margin-bottom: 10px;
}

.toc ul li a {
    color: #444;
    text-decoration: none;
    display: block;
    padding: 5px 0;
    transition: color 0.3s ease;
}

.toc ul li a:hover {
    color: #007bff;
}

/* Styling untuk area konten utama */
.main-content {
    flex: 1;
    padding: 20px;
    background-color: #f5f5f5;
    height: 100%;
}

.no-pdf {
    text-align: center;
    padding: 20px;
    color: #666;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        max-height: 40vh;
    }
    
    .main-content {
        height: 60vh;
    }
}