/**
 * Общий визуальный отклик кнопок: удержание (:active) + короткая вспышка после клика (.ui-btn-flash).
 * Подключать после локальных стилей страницы.
 */
button:not(:disabled),
input[type="submit"]:not(:disabled),
input[type="button"]:not(:disabled) {
  transition: transform 0.1s ease, filter 0.1s ease, box-shadow 0.1s ease;
  touch-action: manipulation;
}

button:not(:disabled):active,
input[type="submit"]:not(:disabled):active,
input[type="button"]:not(:disabled):active {
  transform: scale(0.96);
  filter: brightness(0.9);
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.14);
}

button.secondary:not(:disabled):active,
button.icon-btn:not(:disabled):active {
  filter: brightness(0.94);
  box-shadow: inset 0 1px 5px rgba(0, 0, 0, 0.1);
}

button:focus-visible,
input[type="submit"]:focus-visible,
input[type="button"]:focus-visible {
  outline: 2px solid var(--accent, #1d72d2);
  outline-offset: 2px;
}

button.ui-btn-flash:not(:disabled),
input[type="submit"].ui-btn-flash:not(:disabled),
input[type="button"].ui-btn-flash:not(:disabled) {
  animation: ui-feedback-pulse 0.26s ease;
}

@keyframes ui-feedback-pulse {
  0% {
    filter: brightness(1);
  }
  35% {
    filter: brightness(0.85);
  }
  100% {
    filter: brightness(1);
  }
}