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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: rgb(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.auth-container {
  width: 100%;
  max-width: 400px;
  padding: 20px;
}

.auth-form {
  background: white;
  padding: 40px;
  border-radius: 10px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  display: none;
  animation: slideIn 0.3s ease;
}

.auth-form.active {
  display: block;
}

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

.auth-form h2 {
  text-align: center;
  color: #333;
  margin-bottom: 30px;
  font-size: 28px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: #555;
  font-weight: 500;
  font-size: 14px;
}

.form-group input {
  width: 100%;
  padding: 12px 15px;
  border: 2px solid #e0e0e0;
  border-radius: 5px;
  font-size: 14px;
  transition: border-color 0.3s ease;
}

.form-group input:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.btn-primary {
  width: 100%;
  padding: 12px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  border-radius: 5px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

.form-footer {
  text-align: center;
  margin-top: 20px;
  color: #777;
  font-size: 14px;
}

.form-footer a {
  color: #667eea;
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
}

.form-footer a:hover {
  text-decoration: underline;
}

.error-message {
  color: #e74c3c;
  font-size: 14px;
  margin-top: 10px;
  padding: 10px;
  background-color: #fadbd8;
  border-radius: 5px;
  display: none;
}

.error-message:not(:empty) {
  display: block;
}

.success-message {
  background: white;
  padding: 40px;
  border-radius: 10px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  text-align: center;
  color: #27ae60;
  font-size: 18px;
  animation: slideIn 0.3s ease;
}

/* Responsive Design */
@media (max-width: 480px) {
  .auth-container {
    padding: 15px;
  }

  .auth-form {
    padding: 30px 20px;
  }

  .auth-form h2 {
    font-size: 24px;
    margin-bottom: 25px;
  }
}