/* ===== MATERIALES / RECURSOS EDUCATIVOS ===== */

.exam-main {
  padding: 40px var(--space-3) var(--space-8);
  background: linear-gradient(135deg, var(--background-light) 0%, var(--gray-50) 100%);
  min-height: 100vh;
}

.exam-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-3);
}

#contenedor-materiales {
  padding: 0;
  opacity: 0;
  animation: fadeInMaterials 0.35s ease forwards;
}

#contenedor-materiales.loaded {
  opacity: 1;
}

@keyframes fadeInMaterials {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== CABECERA ===== */

.titulo-niveles-principal {
  color: var(--dark-text);
  font-size: clamp(var(--text-2xl), 4vw, var(--text-3xl));
  font-weight: 800;
  margin: 0 0 var(--space-3);
  line-height: 1.1;
  text-align: center;
}

.titulo-niveles-principal span {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.descripcion-materiales {
  margin: 0 auto var(--space-5);
  color: var(--medium-text);
  font-size: var(--text-sm);
  line-height: 1.5;
  text-align: center;
  max-width: 820px;
}

.descripcion-materiales p {
  margin: 0;
  max-width: 760px;
}

/* ===== FILTROS ===== */

.filtros-materiales-wrapper {
  margin-bottom: var(--space-6);
}

.filtros-materiales-botones {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn-filtro-material {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 18px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--medium-text);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-filtro-material:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
}

.btn-filtro-material.active {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-color: var(--primary);
  color: var(--white);
  box-shadow: 0 4px 12px rgba(52, 152, 219, 0.18);
}

/* ===== SECCIONES ===== */

.material-seccion {
  margin-bottom: var(--space-10);
}

.material-seccion:last-child {
  margin-bottom: 0;
}

.subtitulo-material-modalidad {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0 0 var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--gray-200);
  color: var(--dark-text);
  font-size: var(--text-2xl);
  font-weight: 800;
  line-height: 1.2;
}

.subtitulo-material-modalidad i {
  color: var(--primary);
}

.subtitulo-material-nivel {
  margin: var(--space-6) 0 var(--space-3);
  color: var(--primary);
  font-size: var(--text-xl);
  font-weight: 700;
  line-height: 1.2;
}

/* ===== GRID ===== */

.grid-materiales {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 280px));
  gap: 16px;
  justify-content: start;
  align-items: stretch;
}

/* ===== TARJETAS ===== */

.tarjeta-material {
  width: 100%;
  max-width: 280px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all 0.18s ease;
  opacity: 0;
  transform: translateY(10px);
}

.tarjeta-material.fade-in {
  animation: cardFadeInMaterial 0.28s ease forwards;
}

@keyframes cardFadeInMaterial {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.tarjeta-material:hover {
  transform: translateY(-3px);
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
}

.tarjeta-material-contenido {
  padding: 14px 14px 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.material-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.material-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  width: fit-content;
  padding: 6px 10px;
  background: #eef6ff;
  color: var(--primary-dark);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.material-badge i {
  color: var(--primary);
  font-size: 11px;
}

.material-titulo {
  margin: 0;
  color: var(--dark-text);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 2.6em;
}

.material-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.material-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 8px;
  background: var(--background-light);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 600;
  color: var(--medium-text);
  line-height: 1.2;
}

.material-meta-item i {
  color: var(--primary);
  font-size: 11px;
}

/* ===== FOOTER ===== */

.tarjeta-material-footer {
  padding: 0 14px 14px;
  margin-top: auto;
}

.btn-material-descargar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  min-height: 40px;
  padding: 10px 14px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--white);
  border-radius: var(--radius-full);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 700;
  transition: all 0.18s ease;
}

.btn-material-descargar:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(52, 152, 219, 0.22);
}

.btn-material-descargar i {
  transition: transform 0.18s ease;
}

.btn-material-descargar:hover i {
  transform: translateX(3px);
}

/* ===== MENSAJES ===== */

.mensaje-materiales {
  text-align: center;
  padding: var(--space-8) var(--space-5);
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-2xl);
  color: var(--medium-text);
}

.mensaje-materiales i {
  display: block;
  margin-bottom: var(--space-3);
  font-size: 2rem;
  color: var(--primary);
}

.mensaje-materiales.error i {
  color: var(--error);
}

.mensaje-materiales p {
  margin: 0;
  font-size: var(--text-sm);
}

/* ===== RESPONSIVE ===== */

@media (min-width: 1024px) {
  .exam-main {
    padding-top: calc(var(--space-20) + 40px);
  }
}

@media (max-width: 768px) {
  .titulo-niveles-principal {
    font-size: var(--text-2xl);
  }

  .subtitulo-material-modalidad {
    font-size: var(--text-xl);
  }

  .subtitulo-material-nivel {
    font-size: var(--text-lg);
  }

  .grid-materiales {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }

  .tarjeta-material {
    max-width: none;
  }
}

@media (max-width: 640px) {
  .filtros-materiales-botones {
    flex-direction: column;
  }

  .btn-filtro-material {
    width: 100%;
  }

  .grid-materiales {
    grid-template-columns: 1fr;
  }

  .tarjeta-material {
    max-width: none;
  }
}