.psk-theme-toggle {
  position: fixed;
  left: 16px;
  bottom: 16px;
  z-index: 9000;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border, rgba(127,127,127,.25));
  background: var(--bg-card, var(--bg-soft, #fff));
  color: var(--text, #222);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  box-shadow: 0 6px 20px rgba(0,0,0,.18);
  transition: transform .15s ease, background .2s ease, color .2s ease;
}
.psk-theme-toggle:hover { transform: scale(1.08); }
@media (max-width: 560px) {
  .psk-theme-toggle { width: 38px; height: 38px; left: 12px; bottom: 12px; font-size: 15px; }
}