body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, sans-serif;
  background: linear-gradient(120deg, #f6fff8, #d4f4dd);
  color: #333;
}

.loader-wrapper {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.loader {
  border: 8px solid #d4f4dd;
  border-top: 8px solid #4CAF50;
  border-radius: 50%;
  width: 70px;
  height: 70px;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.hidden {
  display: none;
}

header {
  text-align: center;
  padding: 30px 20px;
}

.logo {
  width: 70px;
  border-radius: 50%;
}

.card {
  background: #fff;
  max-width: 500px;
  margin: 20px auto;
  padding: 30px 20px;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.card input, .card select {
  width: 100%;
  margin: 10px 0;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid #ccc;
}

.card button {
  width: 100%;
  padding: 12px;
  background: #4CAF50;
  color: white;
  border: none;
  font-size: 1rem;
  border-radius: 8px;
  transition: background 0.3s ease;
  cursor: pointer;
}

.card button:hover {
  background: #388e3c;
}

#result {
  margin-top: 20px;
  font-size: 1.2em;
  color: #2e7d32;
  font-weight: bold;
}

footer {
  text-align: center;
  padding: 20px;
  font-size: 0.9em;
  color: #444;
}