body {
  background: whitesmoke;
}
:root {
  --green-: #7bc74d;
  --black-: #222831;
  --greenContrast-: #cdf3b6;
  --gray-: #393e46;
}

body {
  font-family: Arial, sans-serif;
  background-color: var(--black-);
  color: var(--greenContrast-);
  margin: 0;
  padding: 0;
}

h1 {
    font-size: 2rem;
  text-align: center;
  color: var(--green-);
  margin: 2rem auto;
  line-height: 150%;
}

.container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: auto;
  padding: 1rem;
}

.form-container {
  background-color: var(--gray-);
  border-radius: 8px;
  padding: 2rem;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.form-group {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  color: var(--greenContrast-);
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 0.75rem;
  border-radius: 4px;
  border: 1px solid var(--green-);
  background-color: var(--black-);
  color: var(--greenContrast-);
}

input[type="text"]::placeholder,
input[type="password"]::placeholder {
  color: var(--greenContrast-);
}

input[type="text"]:focus,
input[type="password"]:focus {
  outline: none;
  border-color: var(--green-);
  box-shadow: 0 0 5px var(--green-);
}

.btn-submit {
  width: 100%;
  padding: 0.75rem;
  background-color: var(--green-);
  color: var(--black-);
  border: none;
  border-radius: 4px;
  font-size: 1.2rem;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.btn-submit:hover {
  background-color: var(--greenContrast-);
}

.alert-danger {
  background-color: #e74c3c;
  color: white;
  padding: 1rem;
  border-radius: 4px;
  margin-bottom: 1rem;
  text-align: center;
}

@media (max-width: 768px) {
  h1 {
    font-size: 1.5rem;
  }

  .form-container {
    padding: 1.5rem;
  }

  label {
    font-size: 0.9rem;
  }

  input[type="text"],
  input[type="password"] {
    padding: 0.5rem;
    font-size: 1rem;
  }

  .btn-submit {
    padding: 0.5rem;
    font-size: 1.1rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.2rem;
  }

  .form-container {
    padding: 1rem;
  }

  input[type="text"],
  input[type="password"] {
    padding: 0.5rem;
    font-size: 0.9rem;
  }

  .btn-submit {
    padding: 0.4rem;
    font-size: 1rem;
  }
}