body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  /* City of Columbus, Ohio skyline background */
  background: #263238;
  background-image: linear-gradient(
      rgba(38, 50, 56, 0.65),
      /* less opaque for more background visibility */ rgba(99, 130, 145, 0.65),
      rgba(31, 69, 152, 0.4) 90%
    ),
    url("../img/columbus.jpg");
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
  position: relative;
  overflow: auto;
  padding: 0;
}

.login-container,
.signup-container {
  width: 100%;
  max-width: 400px;
  margin: 2rem auto;
  padding: 2rem;
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}
.logo,
.signup-container .logo {
  text-align: center;
  margin-bottom: 2rem;
}
.logo img,
.signup-container .logo img {
  max-width: 200px;
  width: 100%;
  height: auto;
}
.form-control:focus,
.signup-container .form-control:focus {
  border-color: #0d6efd;
  box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}
.btn-primary,
.signup-container .btn-primary {
  background-color: #0d6efd;
  border-color: #0d6efd;
}
.btn-primary:hover,
.signup-container .btn-primary:hover {
  background-color: #0b5ed7;
  border-color: #0a58ca;
}
.forgot-password {
  text-align: right;
  margin-top: 0.5rem;
}
.signup-link,
.signup-container .login-link {
  text-align: center;
  margin-top: 1.5rem;
}

/* Responsive styles */
@media (max-width: 768px) {
  body {
    padding: 0 1rem;
    background-size: cover;
    min-height: 100vh;
  }
  .login-container,
  .signup-container {
    width: 100%;
    max-width: 450px;
    min-width: 0;
    padding: 1.5rem;
    margin: 1.5rem auto;
  }
  .logo img,
  .signup-container .logo img {
    max-width: 160px;
  }

  .form-control {
    font-size: 1rem;
    padding: 0.8rem;
  }

  .btn-primary {
    padding: 0.8rem;
    font-size: 1rem;
  }
}

@media (max-width: 576px) {
  body {
    padding: 0 0.5rem;
  }

  .login-container,
  .signup-container {
    width: 100%;
    max-width: 100%;
    min-width: 0;
    padding: 1.25rem;
    border-radius: 8px;
    margin: 1rem auto;
  }

  .logo img,
  .signup-container .logo img {
    max-width: 140px;
  }

  h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
  }

  .form-label {
    font-size: 0.9rem;
  }

  .form-control {
    font-size: 0.95rem;
    padding: 0.7rem;
    margin-bottom: 0.75rem;
  }

  .btn-primary {
    padding: 0.7rem;
    font-size: 0.95rem;
  }

  .forgot-password,
  .signup-link,
  .signup-container .login-link {
    font-size: 0.9rem;
  }
}

/* Very small devices */
@media (max-width: 360px) {
  .login-container,
  .signup-container {
    padding: 1rem;
    margin: 0.5rem auto;
  }

  h2 {
    font-size: 1.3rem;
  }

  .logo img,
  .signup-container .logo img {
    max-width: 120px;
  }
}