body {
    display: flex;
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
    color: #212529;
}
nav {
    width: 200px;
    background-color: #ffffff;
    height: 100vh;
    padding: 20px;
    border-right: 1px solid #ccc;
    position: sticky;
    top: 0;
}
nav ul {
    list-style-type: none;
    padding: 0;
}
nav li {
    margin-bottom: 15px;
}
nav a {
    text-decoration: none;
    color: #333;
    font-weight: bold;
}
nav a:hover {
    color: #007bff;
}
.indent {
    margin-left: 20px;
}
main {
    flex: 1;
    padding: 40px;
    text-align: center;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: #ffffff;
    line-height: 1.6;
}
.content-wrapper {
    flex: 1;
}
.logo {
    max-width: 300px;
    margin-bottom: 0;
}
.page-header {
    text-align: center;
    padding: 60px 20px;
    background-color: #f1f3f5;
    margin: -40px -40px 40px -40px;
    border-bottom: 1px solid #dee2e6;
}
.page-header h1 {
    margin: 20px 0 10px 0;
    color: #0056b3;
    font-size: 3em;
    font-weight: 800;
}
.page-header p {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.2em;
    color: #495057;
    text-align: center;
}
section {
    margin-top: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid #f0f0f0;
    text-align: left;
}
section:last-of-type {
    border-bottom: none;
}
h2 {
    color: #0056b3;
    margin-bottom: 20px;
}
h3 {
    margin-left: 20px;
    color: #495057;
    margin-top: 25px;
}
section p, section ul {
    margin-left: 20px;
    color: #4a4a4a;
}
.definition {
    position: relative;
    cursor: help;
    border-bottom: 1px dotted #007bff;
    color: #007bff;
    text-decoration: none;
}

.definition::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background-color: #333;
    color: #fff;
    padding: 8px;
    border-radius: 4px;
    font-size: 0.8em;
    white-space: normal;
    width: 200px;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s;
    z-index: 1;
    text-align: center;
}

.definition:hover::after {
    visibility: visible;
    opacity: 1;
}

footer {
    margin-top: 50px;
    padding: 20px;
    border-top: 1px solid #ccc;
    font-size: 0.8em;
    color: #666;
    text-align: center;
}