body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f0f0f0;
  color: #333;
  margin: 0;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

h1 {
  text-align: center;
  font-weight: 300;
  margin-bottom: 40px;
  color: #444;
}

.icono-cabecera {
  text-align: center;
  font-size: 48px;
  color: #888;
  margin-bottom: 10px;
}

.contenedor {
  display: flex;
  gap: 50px;
  width: 100%;
  max-width: 1000px;
  justify-content: center;
}

.seccion {
  flex: 1;
}

h2 {
  font-weight: 300;
  color: #999;
  border-bottom: 1px solid #ddd;
  padding-bottom: 10px;
  margin-bottom: 20px;
}

/* Form estilos */
.grupo-formulario {
  margin-bottom: 15px;
}

label {
  display: block;
  margin-bottom: 5px;
  color: #666;
  font-size: 0.9em;
}

input[type="text"] {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  box-sizing: border-box;
}

.fila {
  display: flex;
  gap: 15px;
}

.fila .grupo-formulario {
  flex: 1;
}

button#btn-anadir-libro {
  width: 100%;
  padding: 12px;
  background-color: #ccc;
  border: none;
  color: #666;
  font-size: 1em;
  cursor: pointer;
  border-radius: 4px;
  margin-top: 20px;
  transition: background-color 0.3s;
}

button#btn-anadir-libro:hover {
  background-color: #bbb;
}

/* Lista estilos */
#lista-lectura {
  list-style: none;
  padding: 0;
  margin: 0;
  background: white;
  border-radius: 4px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.item-libro {
  padding: 15px;
  border-bottom: 1px solid #eee;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.item-libro:last-child {
  border-bottom: none;
}

.info-libro h3 {
  margin: 0 0 5px 0;
  font-size: 1em;
  font-weight: 500;
  color: #444;
}

.info-libro p {
  margin: 0;
  font-size: 0.85em;
  color: #888;
}

.estado-libro {
  font-size: 0.85em;
  color: #aaa;
  text-align: right;
}

.estado-leido {
  color: #aaa;
}

.estado-no-leido {
  color: #aaa;
}

.btn-marcar-leido {
  background: none;
  border: 1px solid #ddd;
  padding: 5px 10px;
  border-radius: 3px;
  color: #666;
  cursor: pointer;
  font-size: 0.8em;
  margin-left: 10px;
}

.btn-marcar-leido:hover {
  background-color: #f9f9f9;
}

.contador-libros {
  text-align: center;
  margin-top: 20px;
  font-size: 0.9em;
  color: #888;
}