/* General body styles */
        body {
            font-family: 'Noto Sans JP', sans-serif;
            line-height: 1.6;
            margin: 20px;
            background-color: #f8f9fa; /* Light gray background */
            color: #343a40; /* Dark gray text */
        }

        /* Heading 1 styles */
        h1 {
            color: #2c3e50; /* Dark blue-gray */
            text-align: center;
            padding-bottom: 10px;
            border-bottom: 2px solid #e9ecef; /* Light border */
            margin-bottom: 30px;
        }

        /* Heading 2 styles */
        h2 {
            color: #34495e; /* Slightly lighter blue-gray */
            margin-top: 40px;
            margin-bottom: 20px;
            padding-left: 10px;
            border-left: 5px solid #007bff; /* Blue accent */
        }

        /* Heading 3 styles */
        h3 {
            color: #34495e;
            margin-top: 30px;
            margin-bottom: 15px;
            padding-left: 8px;
            border-left: 3px solid #6c757d; /* Gray accent */
        }

        /* Heading 4 styles */
        h4 {
            color: #495057; /* Medium gray */
            margin-top: 20px;
            margin-bottom: 10px;
            padding-left: 5px;
        }

        /* Paragraph styles */
        p {
            margin-bottom: 10px;
            text-indent: 1em; /* Indent the first line of paragraphs */
        }

        /* Unordered list styles */
        ul {
            list-style-type: disc;
            margin-left: 40px; /* Increased margin for lists */
            margin-bottom: 15px;
        }

        /* List item styles */
        ul li {
            margin-bottom: 5px;
        }

        /* Strong text styles for emphasis */
        strong {
            font-weight: bold;
            color: #0056b3; /* Darker blue for emphasis */
        }

        /* Container for main content */
        .container {
            max-width: 900px;
            margin: 0 auto;
            padding: 20px;
            background-color: #ffffff; /* White background for content */
            box-shadow: 0 0 15px rgba(0, 0, 0, 0.05); /* Subtle shadow */
            border-radius: 8px; /* Rounded corners */
        }

        /* Navigation buttons container styles */
        .navigation-buttons {
            text-align: center;
            margin-top: 30px;
            margin-bottom: 20px;
        }

        /* Navigation button styles */
        .nav-button {
            background-color: #007bff; /* Blue button */
            color: white;
            padding: 10px 20px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 1em;
            transition: background-color 0.3s ease;
            margin: 0 5px; /* Add some space between buttons */
        }

        /* Navigation button hover effect */
        .nav-button:hover {
            background-color: #0056b3; /* Darker blue on hover */
        }

        /* Print button container styles */
        .print-button-container {
            text-align: center;
            margin-top: 30px;
            margin-bottom: 20px;
        }

        /* Print button styles */
        .print-button {
            background-color: #28a745; /* Green button */
            color: white;
            padding: 10px 20px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 1em;
            transition: background-color 0.3s ease;
        }

        /* Print button hover effect */
        .print-button:hover {
            background-color: #218838; /* Darker green on hover */
        }

        /* Media query for print styles */
        @media print {
            .print-button-container, .navigation-buttons {
                display: none; /* Hide buttons when printing */
            }
            body {
                margin: 0;
                padding: 0;
                box-shadow: none;
            }
            .container {
                box-shadow: none;
                border-radius: 0;
                padding: 0;
                margin: 0;
                width: auto;
                max-width: none;
            }
            h1, h2, h3, h4, p, ul, strong {
                color: black !important; /* Ensure text is black for printing */
            }
        }