@media screen and (max-width: 480px){
    /* 抽屉（菜单浮层） */
    .menu-inner_sp {
        position: fixed;
        inset: 0;
        background: #fff;
        transform: translateX(100%);
        transition: transform .3s ease;
        z-index: 1000;
    }
    .menu-inner_sp.show { transform: translateX(0); }

    .header-navi { list-style: none; margin: 0; padding: 1rem; }
    .header-navi > li { position: relative; }

    /* 锁滚动（配合 JS 的 body.style.top） */
    .is-noscroll {
        position: fixed;
        left: 0; right: 0;
        overflow: hidden;
    }

    /* 子菜单显隐（语义化） */
    .sub-menu[hidden] { display: none !important; }
    .sub-menu { list-style: none; margin: .5rem 0 0; padding-left: 1rem; }

    /* 预留箭头空间：父链接右侧空出位 */
    .header-navi > li.menu-item-has-children > .menu-item-inner {
        display: flex;
        align-items: center;
        flex-direction: row-reverse;
    }
    .header-navi > li.menu-item-has-children > .menu-item-inner > a {
        text-indent: -2em;
        text-align: center;
        padding: 0;
        margin: 0;
        line-height: 42px;
        cursor: pointer;
        display: block;
        flex: 1;
        text-decoration: none;
        border-radius: 0;
        background: rgba(255, 255, 255, 0);
        border: 0 solid #000000;
        white-space: nowrap;
        text-transform: none;
        color: #30623C;
        letter-spacing: 0;
        font-style: normal;
        font-family: "FOT-筑紫ゴシック Pr5N R","FOT-筑紫ゴシック Pr5 R", "ms gothic", "ヒラギノ角ゴ pro w3", "hiragino kaku gothic pro", osaka, sans-serif;
        font-size: 16px;
        font-weight: 700;
    }
    .header-navi > li.menu-item-has-children > a {
        order: 2;                  /* 让 a 在右边 */
        flex: 1;
        padding-left: .5rem;       /* 调整间距 */
    }

    .submenu-toggle {
        order: 1;                  /* 箭头在左 */
        margin-right: .25rem;
        background: none;
        border: none;
        width: 1.5rem;
        height: 1.5rem;
    }

    /* 箭头按钮（插在 <a> 后），看起来像 a::before */
    /*.submenu-toggle {*/
    /*    position: absolute;*/
    /*    left: .5rem;*/
    /*    top: 50%;*/
    /*    transform: translateY(-50%);*/
    /*    width: 1.75rem;*/
    /*    height: 1.75rem;*/
    /*    border: 0;*/
    /*    background: transparent;*/
    /*    cursor: pointer;*/
    /*}*/
    .submenu-toggle::before {
        content: '';
        display: inline-block;
        width: .6rem;
        height: .6rem;
        border-right: 2px solid currentColor;
        border-bottom: 2px solid currentColor;
        transform: rotate(45deg);
    }
    /* 展开态：小箭头旋转 */
    li.is-open > .submenu-toggle::before { transform: rotate(-135deg); }

    .header-navi .current_page_item > a {
        background-color: #d1d3c699;
    }
    /* 汉堡按钮（示意；可用你现有样式替换） */
    .hamburger-menu { width: 32px; height: 20px; position: relative; cursor: pointer; }
    .hamburger-menu span,
    .hamburger-menu::before,
    .hamburger-menu::after {
        content: '';
        position: absolute; left: 0; right: 0;
        height: 2px; background: #30623c;
        transition: transform .2s ease, top .2s ease, opacity .2s ease;
    }
    .hamburger-menu span { transform: translateY(-50%); }
    .hamburger-menu.active::before { top: 50%; transform: translateY(-50%) rotate(45deg); }
    .hamburger-menu.active span { opacity: 0; }
    .hamburger-menu.active::after { bottom: auto; top: 50%; transform: translateY(-50%) rotate(-45deg); }
}