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

body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #f4f4f4;
  color: #333;
  line-height: 1.6;
  padding-bottom: 50px;
}

header {
  background-color: #005caa;
  color: white;
  padding: 20px;
  text-align: center;
}

header h1 {
  font-size: 1.8em;
  margin-bottom: 10px;
}

nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  list-style: none;
  gap: 10px;
}

nav ul li a {
  display: inline-block;
  padding: 10px 15px;
  background-color: #0077cc;
  color: white;
  text-decoration: none;
  border-radius: 5px;
  transition: background 0.3s;
}

nav ul li a:hover {
  background-color: #004c88;
}

main {
  max-width: 800px;
  margin: 30px auto;
  padding: 20px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

main h2 {
  margin-bottom: 15px;
  color: #005caa;
}

main ul {
  list-style-type: disc;
  margin-left: 20px;
}
.btn-simulacro {
  display: inline-block;
  padding: 12px 18px;
  background-color: #4f46e5;
  color: white;
  text-decoration: none;
  border-radius: 10px;
  font-weight: bold;
  transition: background-color 0.3s ease;
  text-align: center;
}

.btn-simulacro:hover {
  background-color: #4338ca;
}
footer {
  position: fixed;
  bottom: 0;
  width: 100%;
  background-color: #005caa;
  color: white;
  text-align: center;
  padding: 10px;
}
/* Modo oscuro */
.modo-oscuro {
  background-color: #1e1e1e;
  color: #f0f0f0;
}

.modo-oscuro main {
  background-color: #2c2c2c;
}

.completado {
  background-color: #d4edda !important;
  border-left: 5px solid green;
  padding-left: 10px;
}