body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.7;
    color: #333;
    background-color: #f8f9fa;
}
.container {
    max-width: 900px;
    margin: 20px auto;
    padding: 25px;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    position: relative;
}
.lang-switcher {
    position: absolute;
    top: 25px;
    right: 25px;
    z-index: 10;
}
.lang-btn {
    background-color: #f0f0f0;
    border: 1px solid #ccc;
    padding: 5px 12px;
    cursor: pointer;
    border-radius: 5px;
    font-size: 0.9em;
    transition: background-color 0.2s, color 0.2s;
}
.lang-btn:hover {
    background-color: #e0e0e0;
}
.lang-btn.active {
    background-color: #3498db;
    color: white;
    border-color: #3498db;
}
h1, h2, h3 {
    color: #2c3e50;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
    margin-top: 40px;
}
h1 {
    text-align: center;
    border: none;
    font-size: 2.5em;
}
nav {
    background: #ecf0f1;
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    border-left: 5px solid #3498db;
}
nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
nav ul li {
    margin-bottom: 8px;
}
nav a {
    text-decoration: none;
    color: #2980b9;
    font-weight: 500;
    transition: color 0.2s;
}
nav a:hover {
    color: #e67e22;
}
.block-section {
    margin-bottom: 30px;
}
.block-category {
    font-size: 1.1em;
    font-weight: bold;
    color: #7f8c8d;
    margin-top: 25px;
    margin-bottom: 15px;
}
.block-item {
    margin-bottom: 20px;
    padding-left: 15px;
    border-left: 3px solid #bdc3c7;
}
.block {
    background-color: #e9ecef;
    padding: 8px 12px;
    border-radius: 5px;
    display: inline-block;
    margin-bottom: 8px;
    font-family: "Menlo", "Monaco", monospace;
    font-size: 0.95em;
    color: #495057;
}
.block-reporter {
    border-radius: 20px;
}
.block-boolean {
    padding: 8px 15px;
}
.description {
    margin-left: 5px;
}
.note {
    background-color: #fffbe6;
    border-left: 5px solid #ffc107;
    padding: 12px 18px;
    margin: 10px 0;
    border-radius: 0 5px 5px 0;
}
code {
    background-color: #ecf0f1;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: "Menlo", "Monaco", monospace;
}
hr {
    border: 0;
    height: 1px;
    background: #ddd;
    margin: 50px 0;
}
.arg {
    background-color: white;
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid #ccc;
}
/* Language visibility logic */
.lang-en {
    display: none;
}
body.lang-en-active .lang-ja {
    display: none;
}
body.lang-en-active .lang-en {
    display: revert;
}