body {
  font-family: Arial, sans-serif;
  background: #f3f6fb;
  padding: 40px;
}

.container {
  max-width: 420px;
  background: #ffffff;
  padding: 25px;
  border-radius: 12px;
  margin: auto;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1 {
  text-align: center;
}

.form-group {
  margin-bottom: 18px;
}

label {
  font-weight: bold;
  display: block;
  margin-bottom: 6px;
}

select {
  width: 100%;
  padding: 8px;
  margin-bottom: 8px;
}

button {
  width: 100%;
  padding: 10px;
  background: #4f7cff;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  background: #3b66e0;
}

.result {
  margin-top: 20px;
  padding: 12px;
  background: #eef3ff;
  border-radius: 6px;
  display: none;
}

.notification {
  margin-top: 12px;
  padding: 8px;
  border-radius: 6px;
  text-align: center;
  font-size: 14px;
  opacity: 0;
  transform: translateY(-6px);
  transition: 0.3s ease;
}

.notification.error {
  background: #ffe5e5;
  color: #b30000;
}

.notification.success {
  background: #e6fff2;
  color: #1b5e3c;
}