.lang-en:not(body) { display: none; }
body.lang-en .lang-th { display: none; }
body.lang-en .lang-en { display: inline; }

#lang-toggle-btn {
  position: fixed;
  top: 14px;
  right: 14px;
  z-index: 99999;
  background: #0b1f3a;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 600;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}
#lang-toggle-btn:hover { background: #14305a; }

/* On smaller screens the mobile menu button sits at top-right of the header,
   so move the language switch button below the header to avoid overlap. */
@media (max-width: 1023px) {
  #lang-toggle-btn {
    top: 76px;
  }
}