:root {
  /* Cores modo escuro */
  --bg-dark: #1e1e1e;
  --text-dark: #ddd;
  --primary-dark: #4a90e2;
  --primary-dark-hover: #357ABD;

  /* Cores modo claro */
  --bg-light: #f9f9f9;
  --text-light: #333;
  --primary-light: #4a90e2;
  --primary-light-hover: #2c5aa0;
}

/* Modo escuro (padrão) */
body {
  background-color: var(--bg-dark);
  color: var(--text-dark);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  transition: background-color 0.3s ease, color 0.3s ease;
}

header {
  background-color: var(--primary-dark);
  color: var(--bg-dark);
  padding: 1rem 0;
  text-align: center;
  box-shadow: 0 2px 4px rgb(0 0 0 / 0.5);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.card {
  background-color: #2c2c2c;
  border: 1px solid var(--primary-dark);
  color: var(--text-dark);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.btn-primary {
  background-color: var(--primary-dark);
  border: none;
  color: var(--bg-dark);
  transition: background-color 0.3s ease;
}

.btn-primary:hover {
  background-color: var(--primary-dark-hover);
  color: var(--bg-dark);
}

.btn-success {
  background-color: #28a745;
  border: none;
  color: white;
}

.btn-danger {
  background-color: #dc3545;
  border: none;
  color: white;
}

.alert-warning {
  background-color: #f0ad4e;
  color: var(--bg-dark);
  font-weight: bold;
  text-align: center;
}

/* Modo claro */
body[data-theme='light'] {
  background-color: var(--bg-light);
  color: var(--text-light);
}

body[data-theme='light'] header {
  background-color: var(--primary-light);
  color: var(--bg-light);
}

body[data-theme='light'] .card {
  background-color: #ffffff;
  border: 1px solid var(--primary-light);
  color: var(--text-light);
}

body[data-theme='light'] .btn-primary {
  background-color: var(--primary-light);
  color: var(--bg-light);
}

body[data-theme='light'] .btn-primary:hover {
  background-color: var(--primary-light-hover);
  color: var(--bg-light);
}