.theme-toggle-btn{
  width:40px;height:40px;border-radius:10px;
  background:var(--bg3,var(--bg-secondary,#0c1526));
  border:1px solid var(--bdr,var(--border,rgba(148,163,184,.2)));
  color:var(--text,var(--text-primary,#e2e8f0));
  font-size:1.05rem;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  box-shadow:var(--shadow-sm,0 2px 8px rgba(0,0,0,.12));
  transition:transform .2s,background .2s,border-color .2s;
  flex-shrink:0;
}
.theme-toggle-btn:hover{transform:scale(1.05);border-color:var(--blue,var(--indigo-light,#38bdf8))}
.theme-toggle-btn:focus-visible{outline:2px solid var(--blue,#38bdf8);outline-offset:2px}
#themeToggleSlot .theme-toggle-btn{position:static}
.theme-toggle-btn.theme-toggle-floating{
  position:fixed;bottom:1.4rem;left:1.4rem;z-index:9998;
  border-radius:50%;width:44px;height:44px;
  box-shadow:0 4px 12px rgba(0,0,0,.3);
}
@media(max-width:480px){
  .theme-toggle-btn.theme-toggle-floating{bottom:1rem;left:1rem;width:40px;height:40px;font-size:1rem}
  #themeToggleSlot .theme-toggle-btn{width:36px;height:36px;font-size:0.95rem}
}