:root {
        --color-bg: #000;
        --color-text: #fff;
        --color-accent: #0092ef;
        --font-main: "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body { font-family: var(--font-main); background: var(--color-bg); color: var(--color-text); line-height: 1.6; }
    .body-wrap { max-width: 1000px; margin: 0 auto; padding: 20px; text-align: center; }
    .logo img { max-width: 100%; height: auto; margin-bottom: 30px; }
    .button-container { display: flex; justify-content: center; gap: 20px; margin: 30px 0; }
    .button-item a img { transition: opacity 0.3s; }
    .button-item a:hover img { opacity: 0.8; }
    .shop_info img { max-width: 100%; margin: 20px 0; }
    .under18 { margin: 40px auto; max-width: 700px; padding: 20px; border: 1px solid #333; }
    footer { margin-top: 50px; border-top: 1px solid #333; padding-top: 30px; }
    .group_link-container h2 img { max-width: 200px; }
    .propertyLink { margin: 20px 0; }
    .alt-banner { display: inline-block; width: 468px; height: 68px; background: #222; color: #fff; line-height: 68px; border: 1px solid #444; margin: 5px; }
    nav { margin: 20px 0; }
    nav a { color: #aaa; text-decoration: none; margin: 0 10px; font-size: 14px; }
    nav a:hover { color: var(--color-accent); }
    .copyright { font-size: 12px; color: #666; margin-top: 20px; }
    @media (max-width: 768px) {
        .button-container { flex-direction: column; align-items: center; }
    }