/* Reset básico */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', Tahoma, sans-serif;
  background: linear-gradient(135deg, #e0e0e0, #f5f5f5);
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Contenedor principal */
.container {
  width: 100%;
  max-width: 400px;
  padding: 20px;
}

/* Tarjeta de login */
.card {
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 0 15px rgba(0,0,0,0.1);
  text-align: center;
}

/* Título */
.card h1 {
  margin-bottom: 20px;
  font-size: 24px;
  color: #333;
}

/* Etiquetas y campos */
form label {
  display: block;
  text-align: left;
  margin-bottom: 10px;
  color: #555;
  font-weight: 500;
}

form input[type="email"],
form input[type="password"] {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 14px;
  transition: border-color 0.3s;
}

form input:focus {
  border-color: #007bff;
  outline: none;
}

/* Botón */
button.btn.primary {
  width: 100%;
  padding: 12px;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 16px;
  cursor: pointer;
  transition: background-color 0.3s;
}

button.btn.primary:hover {
  background-color: #0056b3;
}

/* Mensaje de error */
p {
  margin-bottom: 15px;
  font-size: 14px;
}