body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(to right, #f0f4f8, #d9e4f0);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.container {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  width: 100%;
  max-width: 420px;
  text-align: center;
  animation: fadeIn 0.6s ease-out;
}

h1 {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: #666;
  margin-bottom: 1.5rem;
}

.method-grid {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.method-card {
  flex: 1;
  background: #f9fbfd;
  border: 2px solid transparent;
  border-radius: 10px;
  padding: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
}

.method-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.method-card.selected {
  border-color: #0077cc;
  background: #e6f2ff;
}

.method-card img {
  width: 40px;
  margin-bottom: 0.5rem;
}

#dynamic-fields {
  margin-top: 1rem;
  transition: opacity 0.4s ease;
}

.fade-in {
  opacity: 0;
  animation: fadeIn 0.5s forwards;
}

input {
  width: 100%;
  padding: 0.6rem;
  margin-bottom: 1rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 1rem;
}

button {
  width: 100%;
  padding: 0.8rem;
  background: #0077cc;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.3s ease;
}

button:disabled {
  background: #aacbe1;
  cursor: not-allowed;
}

button:not(:disabled):hover {
  background: #005fa3;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}