/* ============================================================
   响应式站点头部导航 (mobile-friendly)
   - 桌面端：保持各页面原有头部布局（标题在左，操作区在右）
   - 移动端 (<=768px)：标题 + ☰ 汉堡按钮一行，菜单折叠为下拉，
     内部链接 / 按钮 / 语言切换全宽堆叠，不再横向溢出错乱
   该文件仅作用于 .header，不影响 .topbar 等其他结构。
   ============================================================ */

/* 移动端菜单容器：桌面端默认内联显示 */
.site-nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
    flex: 1 1 auto;
    min-width: 0;
    flex-wrap: wrap;
}
/* 防止内部 nav 的 flex:1 把菜单拉伸得很难看 */
.site-nav > nav,
.site-nav > .user-bar,
.site-nav > .header-actions {
    flex: 0 1 auto;
}

/* 汉堡按钮：桌面端隐藏 */
.site-nav__toggle {
    display: none;
    order: 2;
    flex: 0 0 auto;
    width: 40px;
    height: 36px;
    padding: 0;
    border: 1px solid currentColor;
    border-radius: 8px;
    background: transparent;
    color: inherit;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 4px;
    line-height: 0;
}
.site-nav__toggle span {
    display: block;
    width: 18px;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition: transform .2s ease, opacity .2s ease;
}
.site-nav__toggle.is-open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-nav__toggle.is-open span:nth-child(2) { opacity: 0; }
.site-nav__toggle.is-open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 768px) {
    .header {
        flex-wrap: wrap;
        gap: 10px 0;
        padding-left: 16px !important;
        padding-right: 16px !important;
    }
    /* 标题占第一行左侧，汉堡按钮占右侧 */
    .header > :first-child {
        flex: 1 1 auto;
        min-width: 0;
        order: 1;
    }

    /* 菜单容器：默认隐藏，展开时全宽下拉 */
    .site-nav {
        order: 3;
        flex: 1 1 100%;
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        gap: 10px;
        display: none;
        margin-top: 6px;
        padding-top: 10px;
        border-top: 1px solid rgba(128, 128, 128, 0.3);
    }
    .site-nav.site-nav-open { display: flex; }
    .site-nav__toggle { display: inline-flex; }

    /* 内部集群（user-bar / header-actions / nav）在移动端竖向铺满 */
    .site-nav > nav,
    .site-nav > .user-bar,
    .site-nav > .header-actions {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        width: 100%;
        gap: 8px;
        flex-wrap: wrap;
    }

    /* 链接 / 按钮全宽、居中，避免挤在一行 */
    .site-nav nav a,
    .site-nav .user-bar a,
    .site-nav .user-bar button,
    .site-nav .header-actions a,
    .site-nav .header-actions button,
    .site-nav .link-btn,
    .site-nav .btn {
        width: 100%;
        text-align: center;
        justify-content: center;
    }

    /* 语言切换在移动端也全宽 */
    .site-nav [data-i18n-switcher],
    .site-nav .lang-switch {
        width: 100%;
    }

    /* 用户名 / 积分等提示信息居中显示 */
    .site-nav .user-name,
    .site-nav .user-points {
        text-align: center;
        display: block;
    }
}