* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.container {
  width: 100%;
  max-width: 400px;
}

.card {
  background: white;
  border-radius: 12px;
  padding: 40px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
  text-align: center;
}

h1 {
  color: #333;
  font-size: 28px;
  margin-bottom: 8px;
}

.subtitle {
  color: #666;
  font-size: 14px;
  margin-bottom: 30px;
}

.description {
  color: #555;
  font-size: 16px;
  margin-bottom: 30px;
  line-height: 1.6;
}

.help-text {
  color: #999;
  font-size: 13px;
  margin-top: 15px;
}

.btn {
  display: inline-block;
  border: none;
  padding: 14px 40px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  margin-top: 20px;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
  background: #f0f0f0;
  color: #333;
  border: 2px solid #ddd;
}

.btn-secondary:hover {
  background: #e0e0e0;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.loading {
  text-align: center;
}

.spinner {
  border: 4px solid #f3f3f3;
  border-top: 4px solid #667eea;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 20px auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.error {
  color: #e74c3c;
}

#error-message {
  margin-bottom: 15px;
}

.content {
  display: none;
}

.content.show {
  display: block;
}