:root { --theme-control-bg:#ffffff; --theme-control-text:#14233d; --theme-control-line:#c8d6e8; --theme-control-accent:#0b63ce; }
:root[data-theme="light"] { color-scheme:light; }
:root[data-theme="dark"] { color-scheme:dark; --theme-control-bg:#14233b; --theme-control-text:#f0f6ff; --theme-control-line:#49627f; --theme-control-accent:#80b8ff; }
:root button.site-theme-switch {
  display:inline-flex; align-items:center; justify-content:center; gap:6px;
  flex:0 0 auto; width:auto; min-width:36px; height:36px; min-height:36px;
  margin:0; padding:6px 10px; border:1px solid var(--theme-control-line); border-radius:10px;
  background:var(--theme-control-bg); color:var(--theme-control-text);
  font:600 13px/1.4 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  letter-spacing:normal; text-transform:none; white-space:nowrap; cursor:pointer; touch-action:manipulation;
  box-sizing:border-box; box-shadow:none; z-index:5;
}
:root button.site-theme-switch:hover { border-color:var(--theme-control-accent); }
:root button.site-theme-switch:focus-visible { outline:2px solid var(--theme-control-accent); outline-offset:3px; }
.site-theme-icon { font-size:19px; line-height:1; }
:root button.site-theme-floating { position:fixed; top:16px; right:16px; z-index:20; }
@media (max-width:620px) { .site-theme-label { display:none; } :root button.site-theme-switch { height:40px; min-height:40px; min-width:40px; padding:6px; } }