* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #66cbb0, #629cc3, #52ffd4);
  background-attachment: fixed;
  color: #333;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.container {
  background: #ffffff;
  padding: 35px 30px;
  border-radius: 20px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 480px;
}

h1 {
  text-align: center;
  font-size: 1.8rem;
  color: #a400ad;
  margin-bottom: 25px;
}

label {
  display: block;
  margin: 15px 0 5px;
  font-weight: 600;
  color: #333;
}

select,
input[type="text"] {
  width: 100%;
  padding: 12px;
  margin-bottom: 10px;
  border: none;
  border-radius: 10px;
  background: #f1f5ff;
  box-shadow: inset 2px 2px 6px rgba(0, 0, 0, 0.05),
              inset -2px -2px 6px rgba(255, 255, 255, 0.9);
  font-size: 1rem;
  transition: 0.3s;
}

select:focus,
input:focus {
  outline: none;
  background: #ffffff;
  box-shadow: 0 0 0 2px #88baff;
}

button {
  width: 100%;
  padding: 14px;
  background-color: #00adaa;
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.3s;
  margin-top: 20px;
}

button:hover {
  background-color: #007f57;
}

#result {
  margin-top: 25px;
  padding: 15px;
  background-color: #e9f3ff;
  border-left: 5px solid #00ad90;
  border-radius: 10px;
  color: #00ad99;
  font-weight: bold;
  text-align: center;
  display: none;
}

#dialog-box {
  position: fixed;
  top: 30px;
  left: 50%;
  transform: translateX(-50%);
  background-color: #0085ad;
  color: white;
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 1rem;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  z-index: 9999;
  display: none;
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  0% {
    transform: translateX(-50%) translateY(-20px);
    opacity: 0;
  }
  100% {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
  }
}

@media (max-width: 500px) {
  .container {
    padding: 25px 20px;
  }

  h1 {
    font-size: 1.5rem;
  }
}

@media (max-width: 400px) {
  .container {
    padding: 20px 15px;
  }

  h1 {
    font-size: 1.3rem;
  }

  select,
  input[type="text"],
  button {
    font-size: 0.95rem;
    padding: 10px;
  }

  #result {
    font-size: 0.95rem;
  }
}