.ts-back-button {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 9999;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid rgba(203, 213, 225, 0.26);
  background: rgba(15, 23, 42, 0.92);
  color: #f1f5f9;
  font: 600 0.86rem/1 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  letter-spacing: 0.01em;
  box-shadow: 0 10px 25px rgba(2, 6, 23, 0.35);
  text-decoration: none;
}
.ts-back-button:hover { background: rgba(30, 41, 59, 0.96); }
.ts-back-button:focus-visible { outline: 2px solid #a7f3d0; outline-offset: 2px; }
.ts-back-button[hidden] { display: none; }