.source-guard-toast {
  position: fixed;
  left: 50%;
  bottom: max(24px, env(safe-area-inset-bottom));
  z-index: 10000;
  display: flex;
  align-items: center;
  gap: 10px;
  width: max-content;
  max-width: min(520px, calc(100vw - 32px));
  padding: 12px 16px;
  border: 1px solid rgba(125, 211, 252, 0.42);
  border-radius: 8px;
  color: #f8fbff;
  background: rgba(6, 24, 58, 0.94);
  box-shadow: 0 16px 40px rgba(2, 12, 31, 0.3);
  font: 600 13px/1.45 "Be Vietnam Pro", ui-sans-serif, system-ui, sans-serif;
  letter-spacing: 0;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 12px);
  transition: opacity 180ms ease, transform 220ms ease;
  backdrop-filter: blur(14px);
}

.source-guard-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.source-guard-toast svg {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  color: #38bdf8;
}

@media (max-width: 640px) {
  .source-guard-toast {
    bottom: max(76px, calc(env(safe-area-inset-bottom) + 18px));
    width: calc(100vw - 28px);
    justify-content: center;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .source-guard-toast {
    transition: opacity 1ms linear;
  }
}