body {
      background-size: cover;
      background-color: #414040;
      height: 100vh;
      margin: 0;
      font-family: sans-serif;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .login-box {
      background: rgba(0, 0, 0, 0.6);
      padding: 2rem;
      border-radius: 12px;
      width: 100%;
      max-width: 400px;
      color: #ffffff;
      box-shadow: 0 0 20px rgba(0,0,0,0.5);
    }

    .form-control {
      background-color: rgba(255, 255, 255, 0.9);
      border: none;
      border-radius: 8px;
      padding: 0.75rem 1rem;
      font-size: 1rem;
    }

    .form-control:focus {
      box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.3);
    }

    .btn-primary {
      background-color: #6db1a6;
      border: none;
      width: 100%;
      border-radius: 8px;
      padding: 0.75rem;
      font-weight: bold;
    }

    .btn-primary:hover {
      background-color: #5ba398;
    }

    .footer {
      font-size: 0.85rem;
      text-align: center;
      color: #ccc;
      margin-top: 1.5rem;
    }

    .links {
      font-size: 0.9rem;
      text-align: center;
      margin-top: 1rem;
    }

    .links a {
      color: #aee6df;
      text-decoration: none;
    }

    .links a:hover {
      text-decoration: underline;
    }

        .invalid-feedback {
      display: none;
    }

    input.is-invalid ~ .invalid-feedback {
        color: #ffaaaa; /* svetlejšia červená */
      display: block;
    }