/* ===============================
   VARIABLES GLOBALES
================================= */
:root {
  --color-dark: #2c3e50;
  --color-light: #ecf0f1;
  --color-accent: #1abc9c;
  --color-primary: #2980b9;
  --color-primary-hover: #1f6391;
  --font-main: 'Poppins', sans-serif;
  --shadow-card: 0 8px 20px rgba(0, 0, 0, 0.2);
}

/* ===============================
   LOGIN CONTAINER
================================= */
body {
  font-family: var(--font-main);
  background: linear-gradient(135deg, #f5f7fa, #c3cfe2);
}

.login-container {
  max-width: 400px;
  width: 100%;
  margin: 50px auto;
  padding: 2rem;
  background-color: #ffffff;
  border-radius: 1rem;
  box-shadow: var(--shadow-card);
  animation: fadeInUp 0.6s ease-out;
}

.login-container h1 {
  font-size: 2rem;
  color: var(--color-dark);
  text-align: center;
}

.login-container p.lead {
  font-size: 1rem;
  color: #555;
  text-align: center;
  margin-bottom: 20px;
}

.login-container .form-label {
  font-weight: 500;
  color: var(--color-dark);
}

.login-container .form-control {
  border-radius: 0.5rem;
  font-family: var(--font-main);
}

/* ===============================
   BOTÓN
================================= */
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  font-weight: 600;
  border: none;
  font-size: 1.1rem;
  padding: 10px 25px;
  border-radius: 0.5rem;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  transition: background-color 0.3s ease;
}

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

/* ===============================
   ERROR
================================= */
.error {
  color: red;
  margin-top: 10px;
  text-align: center;
  font-size: 0.9rem;
}

/* ===============================
   ANIMACIÓN
================================= */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===============================
   RESPONSIVE
================================= */
@media (max-width: 576px) {
  .login-container {
    padding: 1.5rem;
    margin: 30px auto;
  }

  .login-container h1 {
    font-size: 1.5rem;
  }

  .btn-primary {
    font-size: 1rem;
    padding: 8px 20px;
  }
}