body {
  background-color: #f5f7fa;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}
.login-card {
  width: 100%;
  max-width: 400px;
  padding: 30px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.login-header {
  text-align: center;
  margin-bottom: 30px;
}
.login-header h3 {
  font-weight: bold;
  color: #333;
}