* { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: #f5f5f5;
    color: #222;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
  }
  .login-card {
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    padding: 2rem;
    width: 100%;
    max-width: 380px;
  }
  .login-card h1 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    text-align: center;
    color: #333;
  }
  .form-group { margin-bottom: 1rem; }
  .form-group label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    color: #555;
    margin-bottom: 0.25rem;
  }
  .form-group input {
    width: 100%;
    padding: 0.5rem 0.6rem;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 0.95rem;
    font-family: inherit;
  }
  .btn-login {
    width: 100%;
    padding: 0.6rem;
    border: none;
    border-radius: 6px;
    background: #4d8de8;
    color: #fff;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    margin-top: 0.5rem;
  }
  .btn-login:hover { background: #3a7bd5; }
  .error-msg {
    background: #fdecea;
    color: #c62828;
    padding: 0.5rem 0.75rem;
    border-radius: 5px;
    margin-bottom: 1rem;
    font-size: 0.85rem;
    text-align: center;
  }