/* Estilos para la sección Introducción */

#introduccion {
    max-width: 900px;
    margin: 3rem auto;
    padding: 0 1rem;
    font-family: 'Arial', sans-serif;
    color: #222;
}

h1 {
  font-size: 3rem;
  color: #003b6f;
  text-align: center;
  margin: 0px 0 50px;
  font-weight: 700;
  font-family: 'Montserrat', sans-serif;
  letter-spacing: 1.5px;
  position: relative;
}

h1::after {
  content: '';
  display: block;
  width: 70px;
  height: 4px;
  background-color: #0077b6;
  margin: 10px auto 0;
  border-radius: 2px;
}

.video-container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto 2rem;
    aspect-ratio: 16 / 9;
    background: black;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.video-container video {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.texto-introduccion p {
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    text-align: justify;
}

.contenedor{
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
  width: 100%;
}

/* =========================
   Referencias bibliográficas (sin secciones)
   ========================= */

.referencias {
  padding-top: 26px;
}

.lista-referencias {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: .75rem;
}

/* Cada referencia como “card” */
.ref-item {
  padding: 1rem 1rem 1rem 1.2rem;
  border-radius: 12px;
  border: 1px solid rgba(0,0,0,.08);
  border-left: 4px solid #0077b6;
  background: #ffffff;
  line-height: 1.65;
  font-size: 0.98rem;
  box-shadow: 0 1px 6px rgba(0,0,0,0.04);
}

.ref-item:hover {
  background-color: #f5f9fc;
  transition: background-color 0.2s ease;
}

/* Tipografía clave */
.lista-referencias .autor {
  font-weight: 800;
  color: #003b6f;
  font-family: 'Montserrat', sans-serif;
}

.lista-referencias .titulo {
  font-weight: 650;
}

.lista-referencias em {
  font-style: italic;
  color: #444;
}

.meta{
  font-weight: 800;
  color: #003b6f;
  font-family: 'Montserrat', sans-serif;
}

/* Chips de enlaces */
.ref-links{
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: .65rem;
}

.ref-link{
  display: inline-flex;
  align-items: center;
  padding: .35rem .6rem;
  border-radius: 999px;
  background: #e9f3fb;
  color: #003b6f;
  font-weight: 800;
  font-size: .85rem;
  text-decoration: none;
  border: 1px solid rgba(0,119,182,0.25);
  font-family: 'Montserrat', sans-serif;
}

.ref-link:hover{
  background: #d9edf9;
}

.consulta{
  display: inline-block;
  margin-top: .65rem;
  font-size: .85rem;
  color: #666;
  background: #f2f2f2;
  padding: .25rem .55rem;
  border-radius: 999px;
}

/* Responsive */
@media (max-width: 600px) {
    #introduccion h1 {
        font-size: 1.8rem;
    }

    .video-container {
        height: 40vh;
    }

    .texto-introduccion p {
        font-size: 1rem;
    }

    .ref-item{
      padding: .9rem .9rem .9rem 1rem;
      font-size: 0.95rem;
    }
}