body {
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #0f172a, #1e293b);
  color: white;
  margin: 0;
}

.container {
  max-width: 800px;
  margin: auto;
  padding: 20px;
}

h1 {
  text-align: center;
}

.subtitle {
  text-align: center;
  margin-bottom: 20px;
  color: #94a3b8;
}

.form {
  background: #1e293b;
  padding: 20px;
  border-radius: 10px;
}

input, select {
  width: 100%;
  padding: 10px;
  margin: 8px 0;
  border-radius: 6px;
  border: none;
}

button {
  width: 48%;
  padding: 10px;
  margin-top: 10px;
  border: none;
  border-radius: 6px;
  background: #22c55e;
  color: white;
  cursor: pointer;
}

button:hover {
  background: #16a34a;
}

.output {
  margin-top: 20px;
  background: #0f172a;
  padding: 15px;
  border-radius: 10px;
  white-space: pre-wrap;
}

.checkbox {
  margin-top: 10px;
}