```css
body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #000;
  color: white;
  text-align: center;
}

header {
  padding: 40px 20px;
}

.logo {
  width: 120px;
  margin-bottom: 10px;
}

h1 {
  color: #ffd000;
  margin: 0;
}

.card {
  background: #111;
  margin: 20px auto;
  padding: 25px;
  border-radius: 12px;
  max-width: 400px;
  box-shadow: 0 0 15px rgba(255,208,0,0.2);
}

label {
  display: block;
  margin-top: 15px;
}

input, select {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  border-radius: 6px;
  border: none;
}

.result {
  margin-top: 20px;
  font-size: 18px;
}

.btn {
  display: block;
  background: #ffd000;
  color: black;
  padding: 12px;
  margin-top: 20px;
  text-decoration: none;
  border-radius: 8px;
  font-weight: bold;
}

footer {
  margin: 30px 0;
  font-size: 12px;
  opacity: 0.6;
}
```