body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 20px;
    color: #333;
}

header {
    margin-bottom: 40px;
}

header h1 {
    font-size: 2em;
}

header p {
    margin: 0 auto;
}

.volume {
    margin-bottom: 40px;
}

.volume h2 a {
    color: #007bff;
    text-decoration: none;
    transition: color 0.3s ease;
}

.volume h2 a:hover {
    color: #0056b3;
}

.contents h3, .contents h4, .contents h5 {
    margin: 8px 0;
}

.contents h3 {
    padding-left: 0;
    font-size: 1.1em;
}

.contents h4 {
    padding-left: 20px;
    font-size: 1em;
}

.contents h5 {
    padding-left: 40px;
    font-size: 0.9em;
}

.contents a {
    color: inherit;
    text-decoration: none;
    display: block;
    transition: background-color 0.3s ease, padding-left 0.3s ease;
}

.contents a:hover {
    background-color: #f8f9fa;
    padding-left: 5px; /* Gentle shift */
}