body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  background: linear-gradient(135deg, #0f172a, #1e293b);
  color: #e2e8f0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  text-align: center;
  width: 90%;
  max-width: 500px;
}

h1 {
  margin-bottom: 5px;
}

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

.card {
  background: #1e293b;
  padding: 20px;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  text-align: left;
}

label {
  display: block;
  margin-bottom: 12px;
  cursor: pointer;
}

input[type="radio"] {
  margin-right: 10px;
}

button {
  width: 100%;
  padding: 10px;
  margin-top: 15px;
  border: none;
  border-radius: 10px;
  background: #38bdf8;
  color: #0f172a;
  font-weight: bold;
  cursor: pointer;
  transition: 0.2s;
}

button:hover {
  background: #0ea5e9;
}

.result {
  margin-top: 20px;
  padding: 15px;
  border-radius: 12px;
  background: #020617;
  min-height: 50px;
  font-family: monospace;
}