body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.8;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px 40px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

header {
    text-align: center;
    border-bottom: 2px solid #4a90e2;
    padding-bottom: 20px;
    margin-bottom: 30px;
}

header h1 {
    color: #4a90e2;
    margin: 0;
}

header p {
    color: #666;
    font-size: 1.1em;
    margin: 10px 0 0 0;
}

main h2 {
    color: #4a90e2;
    border-bottom: 1px solid #ddd;
    padding-bottom: 10px;
    margin-top: 40px;
    margin-bottom: 20px;
}

main h3 {
    color: #333;
    border-left: 4px solid #4a90e2;
    padding-left: 10px;
    margin-top: 30px;
}

main p, main li {
    font-size: 16px;
    color: #444;
}

main ul, main ol {
    padding-left: 30px;
    background-color: #fdfdfd;
    border: 1px solid #eee;
    padding-top: 15px;
    padding-bottom: 5px;
    border-radius: 4px;
}

main li {
    margin-bottom: 10px;
}

main code {
    background-color: #eef1f4;
    color: #d63384;
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;
    font-size: 0.9em;
}

main strong {
    color: #0d6efd;
    font-weight: bold;
}

main img {
    max-width: 100%;
    height: auto;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin: 20px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #ddd;
}

.back-link {
    text-decoration: none;
    color: #4a90e2;
    font-weight: 500;
    font-size: 1.1em;
    transition: color 0.2s;
}

.back-link:hover {
    color: #357ABD;
    text-decoration: underline;
}