:root {
    --brand-blue: #F56E0F;
}

/* 共通スタイル */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

h1 {
    color: var(--brand-blue);
    border-bottom: 2px solid var(--brand-blue);
    padding-bottom: 10px;
}

h2 {
    color: var(--brand-blue);
    margin-top: 30px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.date {
    color: #666;
    font-size: 14px;
    margin-bottom: 20px;
}

p {
    margin-bottom: 15px;
}

p.note {
    color: #aaa;
    font-size: 0.9em;
}

ul,
ol {
    margin-bottom: 15px;
}

ol > li > ol {
    margin-top: 8px;
}

li {
    margin-bottom: 8px;
}

.to-base {
    color: gray;
    text-decoration: none;
}

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

.lang-switcher button {
    background: #fff;
    border: 1px solid #ccc;
    border-radius: 4px;
    width: 80px;
    height: 36px;
    margin: 0 4px;
    cursor: pointer;
    font-size: 14px;
    color: #333;
    transition: background-color 0.2s, border-color 0.2s;
}

.lang-switcher button:hover {
    border-color: var(--brand-blue);
    color: var(--brand-blue);
}

.lang-switcher button.active {
    background-color: var(--brand-blue);
    border-color: var(--brand-blue);
    color: #fff;
}