diff --git a/scripts/gen_home_index.py b/scripts/gen_home_index.py
index adf51e4..c1130b4 100644
--- a/scripts/gen_home_index.py
+++ b/scripts/gen_home_index.py
@@ -82,7 +82,10 @@ header = {
             {'wid': 'self', 'event': 'click', 'actiontype': 'script', 'target': 'self',
              'script': scroll_script('sec_flow')}]),
         btn('🌙', 'pl-btn-ghost theme-icon-btn', script=THEME_SCRIPT, small_id='theme_toggle_btn'),
-        {'widgettype': 'urlwidget', 'options': {'url': "{{entire_url('i18n/language.ui')}}"}},
+        # 手机端隐藏语言切换（2026-09-17 手机适配）：390px 宽下 header 预算只够
+        # logo+主题+登录按钮（jp「ログイン / 新規登録」最宽），语言切换登录后仍可切。
+        {'widgettype': 'urlwidget',
+         'options': {'url': "{{entire_url('i18n/language.ui')}}", 'mobile_hidden': True}},
         btn('登录 / 注册', 'pl-btn pl-btn-sm', bind=login_bind()),
     ],
 }
diff --git a/wwwroot/home.css b/wwwroot/home.css
index f97f4b2..aafc376 100644
--- a/wwwroot/home.css
+++ b/wwwroot/home.css
@@ -130,4 +130,15 @@ html[data-theme="dark"] .pl-tag-live{color:#4ade80!important}
   .pl-card{min-height:0;padding:20px!important}
   .pl-orb{filter:blur(70px)}
   .pl-step{padding:18px!important}
+  /* header 手机排布（2026-09-17 实测 390px）：子项禁缩防登录按钮被压成圆坨折三行；
+     logo 去副标题+缩字号+ellipsis 兜底极端字体；语言切换在生成器里 mobile_hidden。 */
+  .pl-header{padding:0 14px!important;gap:8px!important}
+  .pl-header > *{flex-shrink:0!important}
+  .pl-header > *:first-child{flex-shrink:1!important;min-width:0!important}
+  .pl-logo{font-size:14px!important;white-space:nowrap!important;overflow:hidden;text-overflow:ellipsis}
+  .pl-logo-sub{display:none!important}
+  .pl-btn-sm{white-space:nowrap!important;padding:7px 14px!important;font-size:12px!important}
+  /* footer 竖排：版权行 381px+左padding 曾顶出 404px 造成 .pl-scroll 横向滚动 */
+  .pl-footer{flex-direction:column!important;align-items:flex-start!important;gap:6px!important;padding:20px 16px!important}
+  .pl-footer-t{width:100%!important;word-break:break-word!important}
 }
diff --git a/wwwroot/index.ui b/wwwroot/index.ui
index 4a3757a..40f4e79 100644
--- a/wwwroot/index.ui
+++ b/wwwroot/index.ui
@@ -725,6 +725,7 @@
   ]
 }
 
+
 {% else %}
 {
  "id": "app",
@@ -869,7 +870,8 @@
       {
        "widgettype": "urlwidget",
        "options": {
-        "url": "{{entire_url('i18n/language.ui')}}"
+        "url": "{{entire_url('i18n/language.ui')}}",
+        "mobile_hidden": true
        }
       },
       {