.popup {
  display: flex;
  align-items: center;
  justify-content: center;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.75);
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.popup-content {
  padding: 30px;
  border-radius: 16px;
  text-align: center;
  max-width: 400px;
  width: 90%;
  animation: fadeIn 0.4s ease-out;
  transition: all 0.3s ease;
}

.btn {
  border: none;
  border-radius: 8px;
  padding: 12px 24px;
  margin: 5px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

#age-warning {
  margin-top: 10px;
  font-weight: 500;
  display: none;
}

/* Анимация */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: translateY(0); }
}