.japan-phone-generator {
  font-family: Arial, sans-serif;
  background: #0f0f0f;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 30px 25px;
  max-width: 450px;
  margin: 0 auto;
  color: #fff;
  text-align: center;
  box-shadow: 0 0 25px rgba(76, 175, 80, 0.3);
  transition: all 0.3s ease-in-out;
}

.japan-phone-generator__title {
  font-size: 1.6rem;
  margin-bottom: 25px;
  background: linear-gradient(90deg, #4CAF50, #00ff99);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: bold;
  text-transform: uppercase;
}

.japan-phone-generator__container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.japan-phone-generator__button {
  background-color: #4CAF50;
  border: none;
  border-radius: 6px;
  color: #fff;
  font-size: 18px;
  padding: 14px 25px;
  cursor: pointer;
  transition: all 0.3s ease;
  width: 100%;
  max-width: 280px;
  font-weight: bold;
}

.japan-phone-generator__button:hover {
  background-color: #45a049;
  box-shadow: 0 0 15px rgba(76, 175, 80, 0.6);
  transform: scale(1.03);
}

.japan-phone-generator__output {
  font-size: 20px;
  font-weight: bold;
  color: #00ffcc;
  background: rgba(255, 255, 255, 0.05);
  padding: 14px;
  border-radius: 6px;
  width: 100%;
  max-width: 300px;
  min-height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.japan-phone-generator__output.active {
  box-shadow: 0 0 20px rgba(0, 255, 204, 0.3);
}

@media (max-width: 600px) {
  .japan-phone-generator {
    padding: 20px 15px;
  }

  .japan-phone-generator__title {
    font-size: 1.4rem;
  }

  .japan-phone-generator__button {
    font-size: 16px;
  }

  .japan-phone-generator__output {
    font-size: 18px;
  }
}