:root { --primary: #0ea5e9; --text-main: #1e293b; --border: #e2e8f0; }
    .site-wrapper { display: flex; flex-direction: column; min-height: 100vh; }
    
    .fb-header { background: #fff; border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 1000; padding: 10px 0; width: 100%; }
    .fb-header__inner { max-width: 1200px; margin: 0 auto; padding: 0 15px; display: flex; align-items: center; justify-content: space-between; height: 50px; }
    .fb-header__logo img { height: 40px; width: auto; display: block; }
    
    .fb-header__nav { display: flex; gap: 20px; }
    .fb-header__nav a { text-decoration: none; color: var(--text-main); font-size: 14px; font-weight: 700; }
    .fb-header__nav a:hover { color: var(--primary); }

    /* ハンバーガーボタンのスタイル強化 */
    .menu-trigger { 
        display: none; 
        background: #f8fafc; 
        border: 1px solid var(--border); 
        font-size: 24px; 
        cursor: pointer; 
        color: var(--text-main); 
        padding: 8px 12px; 
        border-radius: 8px;
        line-height: 1;
        z-index: 1200;
    }
    
    .mobile-menu { position: fixed; top: 0; right: -100%; width: 80%; max-width: 300px; height: 100vh; background: #0f172a; z-index: 1500; transition: 0.3s; padding: 60px 20px; box-sizing: border-box; overflow-y: auto; }
    .mobile-menu.is-active { right: 0; box-shadow: -10px 0 20px rgba(0,0,0,0.5); }
    .mobile-menu__close { position: absolute; top: 20px; right: 20px; color: #fff; font-size: 35px; background: none; border: none; cursor: pointer; }
    .mobile-menu__list { list-style: none; padding: 0; margin: 0; }
    .mobile-menu__list li { border-bottom: 1px solid #1e293b; }
    .mobile-menu__list a { display: block; padding: 18px 0; color: #fff; text-decoration: none; font-weight: 700; font-size: 16px; }
    
    .mobile-menu__sns { margin-top: 30px; padding-top: 20px; border-top: 1px solid #1e293b; display: flex; gap: 20px; justify-content: center; }
    .mobile-menu__sns a { font-size: 28px; }

    .menu-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.7); z-index: 1400; display: none; }
    .menu-overlay.is-active { display: block; }

    @media (max-width: 1024px) {
        .fb-header__nav { display: none; }
        .menu-trigger { display: inline-flex; align-items: center; justify-content: center; }
    }