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

body {
    font-family: "Inter", "Helvetica Neue", Arial, sans-serif;
    background-color: #f9faf9;
    color: #2e2e2e;
    line-height: 1.6;
    display: flex;
}

nav {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: 220px;
    background-color: #2f4f4f; 
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.1);
    padding-top: 20px;
    transition: width 0.3s ease;
    overflow: hidden;
}

nav.collapsed {
    width: 60px;
}

nav ul {
    list-style-type: none;
    padding-left: 0;
    margin-top: 40px;
}

nav ul li {
    margin-bottom: 20px;
}

nav ul li a {
    color: #e0f2e9; 
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    display: block;
    padding: 10px;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: #b0d3b9; 
}

nav.collapsed ul li a {
    font-size: 0;
    padding: 10px 0;
    text-align: center;
}

nav.collapsed ul li a::before {
    content: attr(data-icon);
    font-size: 18px;
    margin-right: 0;
    color: #e0f2e9; 
}

#toggle-btn {
    position: absolute;
    top: 20px;
    left: 10px;
    background-color: transparent;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #e0f2e9;
}

#main-content {
    padding: 40px;
    width: 100%;
    max-width: 1200px;
    margin-left: 260px;
    margin-right: auto;
    transition: margin-left 0.3s ease;
    background-color: #ffffff; 
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05); 
    border-radius: 8px;
}

nav.collapsed + #main-content {
    margin-left: 120px;
}

section {
    margin-bottom: 40px;
} 

h1 {
    color: #2f4f4f;
}

h2 {
    font-size: 24px;
    color: #2f4f4f; 
}

p {
    font-size: 16px;
    color: #2e2e2e;
}

pre {
    background-color: #e8f0e8; 
    color: #2e2e2e;
    padding: 2px;
    border-radius: 6px;
    font-size: 14px;
    overflow-x: auto;
    margin-top: 24px;
    font-family: 'Courier New', monospace;
    border: 1px solid #b0d3b9; 
}

.collapsible {
    background-color: #e0eae0; 
    color: #333;
    cursor: pointer;
    padding: 10px;
    width: 100%;
    text-align: left;
    border: none;
    font-size: 16px;
    border-bottom: 1px solid #ccc;
}

.collapsible:hover {
    background-color: #c8d8c8; 
}

.collapsible.active {
    background-color: #c8d8c8;
}

.content {
    padding: 0 18px;
    display: none;
    overflow: hidden;
    background-color: #f0f7f0; 
    margin-bottom: 10px;
}

.content p {
    padding: 10px 8px;
}


.content ul {
    padding: 10px 8px;
}

.content ol {
    padding: 10px 8px;
}