/* ==========================================================================
   Módulo 9 — Innovación e IA en la Educación Científica · UTP
   Hoja de estilos principal
   ========================================================================== */

:root {
  /* Paleta institucional (azul del logo UTP) */
  --azul-900: #051F38;
  --azul-800: #062A4A;
  --azul-700: #003B71;
  --azul-600: #0B5FA5;
  --azul-500: #1E7BC4;
  --azul-200: #A9CDEC;
  --azul-100: #DCEAF7;
  --azul-50:  #EEF5FC;

  --dorado:       #F5A800;
  --dorado-700:   #8A5B00;
  --dorado-claro: #FFF3D6;

  --tinta:    #10243B;
  --gris-700: #44546A;
  --gris-500: #64748B;
  --gris-300: #CBD5E1;
  --gris-100: #EEF2F7;
  --blanco:   #FFFFFF;
  --fondo:    #F7FAFD;

  --radio:    16px;
  --radio-sm: 10px;
  --sombra-sm: 0 1px 2px rgba(6, 42, 74, 0.06), 0 2px 8px rgba(6, 42, 74, 0.06);
  --sombra-md: 0 6px 24px rgba(6, 42, 74, 0.10);
  --sombra-lg: 0 16px 48px rgba(6, 42, 74, 0.16);

  --fuente-titulos: "Space Grotesk", "Inter", system-ui, sans-serif;
  --fuente-cuerpo:  "Inter", system-ui, -apple-system, sans-serif;

  --ancho-max: 1120px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 92px; }

body {
  font-family: var(--fuente-cuerpo);
  color: var(--tinta);
  background: var(--fondo);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--azul-600); }

.contenedor {
  width: min(var(--ancho-max), 92%);
  margin-inline: auto;
}

/* Accesibilidad ------------------------------------------------------- */
.salto-contenido {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--azul-700);
  color: var(--blanco);
  padding: 10px 18px;
  border-radius: 0 0 var(--radio-sm) 0;
  z-index: 200;
}
.salto-contenido:focus { left: 0; }

:focus-visible {
  outline: 3px solid var(--dorado);
  outline-offset: 2px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

/* Encabezado ----------------------------------------------------------- */
.encabezado {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.encabezado.con-scroll {
  border-bottom-color: var(--gris-100);
  box-shadow: var(--sombra-sm);
}

.encabezado .contenedor {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 76px;
}

.marca {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--tinta);
}
.marca img { height: 38px; width: auto; flex-shrink: 0; }
.marca .marca-texto { line-height: 1.15; }
.marca .marca-texto strong {
  display: block;
  font-family: var(--fuente-titulos);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--azul-700);
  max-width: 260px;
}
.marca .marca-texto span { display: block; font-size: 0.74rem; color: var(--gris-500); margin-top: 2px; }

.navegacion ul {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}
.navegacion a {
  display: inline-block;
  padding: 8px 11px;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gris-700);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.2s ease, color 0.2s ease;
}
.navegacion a:hover { background: var(--azul-50); color: var(--azul-700); }
.navegacion a.activo { background: var(--azul-100); color: var(--azul-700); }
.navegacion a.nav-cta {
  background: var(--azul-700);
  color: var(--blanco);
  margin-left: 8px;
}
.navegacion a.nav-cta:hover { background: var(--azul-600); }

.boton-menu {
  display: none;
  background: none;
  border: 1.5px solid var(--gris-300);
  border-radius: var(--radio-sm);
  padding: 8px 10px;
  font-size: 1.25rem;
  line-height: 1;
  color: var(--azul-700);
  cursor: pointer;
}

/* Botones --------------------------------------------------------------- */
.boton {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: 999px;
  font-family: var(--fuente-cuerpo);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}
.boton:hover { transform: translateY(-2px); }
.boton:active { transform: translateY(0); }

.boton-primario {
  background: var(--azul-700);
  color: var(--blanco);
  box-shadow: 0 8px 20px rgba(0, 59, 113, 0.28);
}
.boton-primario:hover { background: var(--azul-600); box-shadow: 0 10px 26px rgba(0, 59, 113, 0.32); }

.boton-secundario {
  background: var(--blanco);
  color: var(--azul-700);
  border-color: var(--azul-200);
}
.boton-secundario:hover { border-color: var(--azul-600); background: var(--azul-50); }

.boton-dorado {
  background: var(--dorado);
  color: var(--azul-900);
  box-shadow: 0 8px 20px rgba(245, 168, 0, 0.30);
}
.boton-dorado:hover { background: #FFB820; }

/* Héroe ------------------------------------------------------------------ */
.heroe {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(900px 480px at 85% -10%, rgba(30, 123, 196, 0.14), transparent 60%),
    radial-gradient(700px 420px at -10% 110%, rgba(245, 168, 0, 0.10), transparent 60%),
    linear-gradient(180deg, #FFFFFF 0%, var(--fondo) 100%);
}
.heroe::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 59, 113, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 59, 113, 0.045) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 20%, black 35%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 20%, black 35%, transparent 75%);
  pointer-events: none;
}

.heroe .contenedor {
  position: relative;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
  padding-block: 96px 110px;
}

.heroe-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--blanco);
  border: 1px solid var(--azul-100);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--azul-700);
  box-shadow: var(--sombra-sm);
}
.heroe-eyebrow .punto {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--dorado);
}

.heroe h1 {
  font-family: var(--fuente-titulos);
  font-size: clamp(2.35rem, 5.2vw, 3.9rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--azul-900);
  margin: 22px 0 20px;
}
.heroe h1 .resaltado {
  position: relative;
  z-index: 0;
  white-space: nowrap;
  color: var(--azul-700);
}
.heroe h1 .resaltado::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0.06em;
  height: 0.32em;
  background: var(--dorado);
  opacity: 0.38;
  border-radius: 4px;
  z-index: -1;
}

.heroe-descripcion {
  font-size: 1.13rem;
  color: var(--gris-700);
  max-width: 54ch;
  margin-bottom: 32px;
}

.heroe-acciones { display: flex; flex-wrap: wrap; gap: 14px; }

.heroe-notas {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 30px;
  font-size: 0.88rem;
  color: var(--gris-500);
}
.heroe-notas span { display: inline-flex; align-items: center; gap: 7px; }
.heroe-notas i { color: var(--azul-600); font-size: 1rem; }

/* Tarjeta de chat del héroe */
.heroe-visual { position: relative; }

.chat-tarjeta {
  background: var(--blanco);
  border: 1px solid var(--azul-100);
  border-radius: var(--radio);
  box-shadow: var(--sombra-lg);
  padding: 22px;
  max-width: 420px;
  margin-inline: auto;
  position: relative;
  z-index: 2;
}
.chat-cabecera {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--gris-100);
  margin-bottom: 14px;
}
.chat-cabecera .chat-icono {
  width: 38px; height: 38px;
  border-radius: 12px;
  background: var(--azul-700);
  color: var(--blanco);
  display: grid;
  place-items: center;
  font-size: 1.15rem;
}
.chat-cabecera strong { font-size: 0.95rem; color: var(--azul-900); display: block; line-height: 1.2; }
.chat-cabecera small { color: var(--gris-500); font-size: 0.78rem; }
.chat-cabecera .chat-estado {
  margin-left: auto;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: #34C77B;
}

.chat-burbuja {
  border-radius: 14px;
  padding: 12px 15px;
  font-size: 0.88rem;
  line-height: 1.5;
  margin-bottom: 10px;
  max-width: 92%;
}
.chat-burbuja.docente {
  background: var(--azul-700);
  color: var(--blanco);
  border-bottom-right-radius: 4px;
  margin-left: auto;
}
.chat-burbuja.ia {
  background: var(--azul-50);
  color: var(--tinta);
  border: 1px solid var(--azul-100);
  border-bottom-left-radius: 4px;
}
.chat-burbuja.ia .escribiendo {
  display: inline-flex;
  gap: 4px;
  align-items: center;
}
.chat-burbuja.ia .escribiendo i {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--azul-500);
  animation: pulso 1.2s infinite ease-in-out;
}
.chat-burbuja.ia .escribiendo i:nth-child(2) { animation-delay: 0.15s; }
.chat-burbuja.ia .escribiendo i:nth-child(3) { animation-delay: 0.3s; }

@keyframes pulso {
  0%, 100% { opacity: 0.35; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(-3px); }
}

.chip-flotante {
  position: absolute;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--blanco);
  border: 1px solid var(--azul-100);
  border-radius: 999px;
  padding: 9px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--azul-800);
  box-shadow: var(--sombra-md);
  z-index: 3;
  animation: flotar 5.5s ease-in-out infinite;
}
.chip-flotante i { color: var(--azul-600); font-size: 1.05rem; }
.chip-flotante.fisica   { top: -18px; left: 4%;  animation-delay: 0s; }
.chip-flotante.quimica  { top: 46%;  right: -14px; animation-delay: 1.2s; }
.chip-flotante.biologia { bottom: -16px; left: 10%; animation-delay: 2.1s; }
.chip-flotante.ia-chip  { bottom: 26%; left: -26px; animation-delay: 3s; }
.chip-flotante.ia-chip i { color: var(--dorado-700); }

@keyframes flotar {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* Franja de cifras ------------------------------------------------------- */
.cifras {
  background: var(--azul-700);
  color: var(--blanco);
}
.cifras .contenedor {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding-block: 38px;
}
.cifra { text-align: center; }
.cifra .numero {
  font-family: var(--fuente-titulos);
  font-size: clamp(1.9rem, 3.4vw, 2.6rem);
  font-weight: 700;
  line-height: 1.1;
}
.cifra .numero small { font-size: 0.55em; font-weight: 500; }
.cifra .detalle {
  font-size: 0.88rem;
  color: var(--azul-200);
  margin-top: 2px;
}

/* Secciones -------------------------------------------------------------- */
.seccion { padding-block: 92px; }
.seccion.alterna { background: var(--blanco); }

.seccion-cabecera { max-width: 720px; margin-bottom: 52px; }
.seccion-cabecera.centrada { margin-inline: auto; text-align: center; }

.etiqueta {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--azul-600);
  background: var(--azul-50);
  border: 1px solid var(--azul-100);
  border-radius: 999px;
  padding: 6px 14px;
  margin-bottom: 16px;
}

.seccion h2 {
  font-family: var(--fuente-titulos);
  font-size: clamp(1.8rem, 3.6vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--azul-900);
  margin-bottom: 14px;
}
.seccion-cabecera p { color: var(--gris-700); font-size: 1.05rem; }

/* El módulo ---------------------------------------------------------------- */
.modulo-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 44px;
  align-items: start;
}
.modulo-texto p { color: var(--gris-700); margin-bottom: 16px; }
.modulo-texto strong { color: var(--azul-800); }

.tarjeta-cts {
  background: linear-gradient(135deg, var(--azul-700), var(--azul-800));
  color: var(--blanco);
  border-radius: var(--radio);
  padding: 30px;
  box-shadow: var(--sombra-md);
}
.tarjeta-cts h3 {
  font-family: var(--fuente-titulos);
  font-size: 1.3rem;
  margin-bottom: 10px;
}
.tarjeta-cts p { color: var(--azul-100); font-size: 0.95rem; margin-bottom: 18px; }
.tarjeta-cts ul { list-style: none; display: grid; gap: 12px; }
.tarjeta-cts li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 0.93rem;
}
.tarjeta-cts li i {
  flex-shrink: 0;
  width: 30px; height: 30px;
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.14);
  color: var(--dorado);
  display: grid;
  place-items: center;
  font-size: 1rem;
}
.tarjeta-cts li strong { display: block; color: var(--blanco); }
.tarjeta-cts li span { color: var(--azul-200); }

/* Resultados de aprendizaje ------------------------------------------------ */
.resultados-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 18px;
}
.resultado {
  flex: 1 1 300px;
  max-width: 348px;
  background: var(--blanco);
  border: 1px solid var(--gris-100);
  border-radius: var(--radio);
  padding: 26px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  box-shadow: var(--sombra-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.resultado:hover {
  transform: translateY(-4px);
  box-shadow: var(--sombra-md);
  border-color: var(--azul-100);
}
.resultado .indice {
  flex-shrink: 0;
  width: 42px; height: 42px;
  border-radius: 12px;
  background: var(--azul-50);
  color: var(--azul-700);
  font-family: var(--fuente-titulos);
  font-weight: 700;
  font-size: 1.1rem;
  display: grid;
  place-items: center;
}
.resultado p { font-size: 0.95rem; color: var(--gris-700); }
.resultado p strong { color: var(--azul-900); display: block; margin-bottom: 4px; }

/* Clases (tarjetas en home) ------------------------------------------------ */
.clases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(255px, 1fr));
  gap: 18px;
}
.clase-tarjeta {
  position: relative;
  background: var(--blanco);
  border: 1px solid var(--gris-100);
  border-radius: var(--radio);
  padding: 28px 24px 24px;
  text-decoration: none;
  box-shadow: var(--sombra-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.clase-tarjeta:hover {
  transform: translateY(-5px);
  box-shadow: var(--sombra-md);
  border-color: var(--azul-200);
}
.clase-tarjeta .numero-clase {
  font-family: var(--fuente-titulos);
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--azul-100);
  transition: color 0.2s ease;
}
.clase-tarjeta:hover .numero-clase { color: var(--dorado); }
.clase-tarjeta h3 {
  font-family: var(--fuente-titulos);
  font-size: 1.12rem;
  color: var(--azul-900);
  line-height: 1.3;
}
.clase-tarjeta p { font-size: 0.9rem; color: var(--gris-500); flex-grow: 1; }
.clase-tarjeta .enlace {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--azul-600);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Metodología ---------------------------------------------------------------- */
.metodologia-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}
.metodo {
  background: var(--blanco);
  border: 1px solid var(--gris-100);
  border-radius: var(--radio);
  padding: 24px 20px;
  text-align: center;
  box-shadow: var(--sombra-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.metodo:hover { transform: translateY(-4px); box-shadow: var(--sombra-md); }
.metodo i {
  font-size: 1.7rem;
  color: var(--azul-600);
  background: var(--azul-50);
  width: 56px; height: 56px;
  border-radius: 16px;
  display: inline-grid;
  place-items: center;
  margin-bottom: 14px;
}
.metodo h3 { font-family: var(--fuente-titulos); font-size: 1rem; color: var(--azul-900); margin-bottom: 6px; }
.metodo p { font-size: 0.86rem; color: var(--gris-500); }

/* Evaluación ----------------------------------------------------------------- */
.evaluacion-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  align-items: center;
}
.barra-evaluacion {
  display: flex;
  height: 56px;
  border-radius: var(--radio-sm);
  overflow: hidden;
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: var(--sombra-sm);
}
.barra-evaluacion .tramo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--blanco);
}
.barra-evaluacion .proceso { width: 30%; background: var(--azul-500); }
.barra-evaluacion .producto { width: 70%; background: var(--azul-700); }

.desglose { margin-top: 26px; display: grid; gap: 12px; }
.desglose-fila { display: grid; grid-template-columns: 170px 1fr 52px; align-items: center; gap: 14px; font-size: 0.92rem; }
.desglose-fila .nombre { color: var(--gris-700); font-weight: 500; }
.desglose-fila .pista {
  display: block;
  height: 12px;
  background: var(--gris-100);
  border-radius: 999px;
  overflow: hidden;
}
.desglose-fila .relleno {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--dorado), #FFC533);
  border-radius: 999px;
  width: 0;
  transition: width 1s cubic-bezier(0.22, 1, 0.36, 1);
}
.desglose-fila .valor { font-weight: 700; color: var(--azul-800); text-align: right; }

.evaluacion-nota {
  background: var(--blanco);
  border: 1px solid var(--gris-100);
  border-left: 5px solid var(--dorado);
  border-radius: var(--radio-sm);
  padding: 22px 24px;
}
.evaluacion-nota h3 { font-family: var(--fuente-titulos); font-size: 1.1rem; color: var(--azul-900); margin-bottom: 8px; }
.evaluacion-nota p { font-size: 0.93rem; color: var(--gris-700); }
.evaluacion-nota ul { margin: 12px 0 0 18px; font-size: 0.93rem; color: var(--gris-700); }
.evaluacion-nota li { margin-bottom: 6px; }

/* Herramientas ----------------------------------------------------------------- */
.herramientas-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}
.herramienta {
  flex: 1 1 280px;
  max-width: 348px;
  background: var(--blanco);
  border: 1px solid var(--gris-100);
  border-radius: var(--radio);
  padding: 22px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  text-decoration: none;
  box-shadow: var(--sombra-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.herramienta:hover { transform: translateY(-4px); box-shadow: var(--sombra-md); border-color: var(--azul-200); }
.herramienta i {
  flex-shrink: 0;
  font-size: 1.4rem;
  color: var(--azul-600);
  background: var(--azul-50);
  width: 46px; height: 46px;
  border-radius: 13px;
  display: grid;
  place-items: center;
}
.herramienta strong { display: block; color: var(--azul-900); font-size: 0.98rem; }
.herramienta span { font-size: 0.85rem; color: var(--gris-500); }

/* Docente ------------------------------------------------------------------------ */
.docente-tarjeta {
  background: var(--blanco);
  border: 1px solid var(--gris-100);
  border-radius: var(--radio);
  box-shadow: var(--sombra-md);
  padding: 36px;
  display: flex;
  gap: 28px;
  align-items: center;
  max-width: 760px;
  margin-inline: auto;
}
.docente-avatar {
  flex-shrink: 0;
  width: 96px; height: 96px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--azul-700), var(--azul-500));
  color: var(--blanco);
  font-family: var(--fuente-titulos);
  font-size: 2rem;
  font-weight: 700;
  display: grid;
  place-items: center;
}
.docente-info h3 { font-family: var(--fuente-titulos); font-size: 1.35rem; color: var(--azul-900); }
.docente-info .rol { color: var(--azul-600); font-weight: 600; font-size: 0.92rem; margin-bottom: 8px; }
.docente-info p { font-size: 0.94rem; color: var(--gris-700); }

/* Llamado final --------------------------------------------------------------------- */
.cta-final {
  background:
    radial-gradient(700px 300px at 90% 0%, rgba(245, 168, 0, 0.16), transparent 60%),
    linear-gradient(135deg, var(--azul-800), var(--azul-700));
  color: var(--blanco);
  text-align: center;
  border-radius: calc(var(--radio) + 8px);
  padding: 64px 28px;
}
.cta-final h2 { color: var(--blanco); font-family: var(--fuente-titulos); font-size: clamp(1.7rem, 3.4vw, 2.4rem); margin-bottom: 12px; }
.cta-final p { color: var(--azul-100); max-width: 56ch; margin: 0 auto 28px; }

/* Pie de página ----------------------------------------------------------------------- */
.pie {
  background: var(--azul-900);
  color: var(--azul-200);
  margin-top: 92px;
}
.pie-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 36px;
  padding-block: 56px;
}
.pie h4 { color: var(--blanco); font-family: var(--fuente-titulos); font-size: 1rem; margin-bottom: 14px; }
.pie p, .pie a { font-size: 0.9rem; color: var(--azul-200); }
.pie a { text-decoration: none; }
.pie a:hover { color: var(--blanco); text-decoration: underline; }
.pie ul { list-style: none; display: grid; gap: 9px; }
.pie .pie-marca { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.pie .pie-marca img { height: 40px; filter: brightness(0) invert(1); opacity: 0.95; }
.pie .pie-marca strong { color: var(--blanco); font-family: var(--fuente-titulos); }
.pie-inferior {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-block: 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--azul-200);
}

/* Página de contenidos ------------------------------------------------------------------ */
.subheroe {
  background:
    radial-gradient(800px 380px at 80% -20%, rgba(30, 123, 196, 0.16), transparent 60%),
    linear-gradient(180deg, #FFFFFF 0%, var(--fondo) 100%);
  padding-block: 72px 56px;
  text-align: center;
}
.subheroe h1 {
  font-family: var(--fuente-titulos);
  font-size: clamp(2rem, 4.4vw, 3rem);
  letter-spacing: -0.02em;
  color: var(--azul-900);
  margin: 18px 0 12px;
}
.subheroe p { color: var(--gris-700); max-width: 62ch; margin-inline: auto; font-size: 1.05rem; }

.acordeon-clases { display: grid; gap: 18px; max-width: 960px; margin-inline: auto; }

details.clase-bloque {
  background: var(--blanco);
  border: 1px solid var(--gris-100);
  border-radius: var(--radio);
  box-shadow: var(--sombra-sm);
  overflow: hidden;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}
details.clase-bloque[open] { box-shadow: var(--sombra-md); border-color: var(--azul-200); }

details.clase-bloque summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 24px 26px;
  user-select: none;
}
details.clase-bloque summary::-webkit-details-marker { display: none; }
details.clase-bloque summary:hover { background: var(--azul-50); }

.clase-numero {
  flex-shrink: 0;
  width: 54px; height: 54px;
  border-radius: 16px;
  background: var(--azul-700);
  color: var(--blanco);
  font-family: var(--fuente-titulos);
  font-size: 1.35rem;
  font-weight: 700;
  display: grid;
  place-items: center;
}
details.clase-bloque[open] .clase-numero { background: var(--dorado); color: var(--azul-900); }

.clase-titular { flex-grow: 1; min-width: 0; }
.clase-titular h2 {
  font-family: var(--fuente-titulos);
  font-size: 1.18rem;
  color: var(--azul-900);
  line-height: 1.3;
  margin-bottom: 4px;
}
.clase-titular .clase-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.8rem;
}
.clase-meta span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--azul-50);
  border: 1px solid var(--azul-100);
  color: var(--azul-700);
  border-radius: 999px;
  padding: 3px 11px;
  font-weight: 600;
}

.clase-chevron {
  flex-shrink: 0;
  font-size: 1.3rem;
  color: var(--azul-600);
  transition: transform 0.25s ease;
}
details.clase-bloque[open] .clase-chevron { transform: rotate(180deg); }

.clase-cuerpo {
  border-top: 1px solid var(--gris-100);
  padding: 28px 26px 30px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  animation: aparecer 0.35s ease;
}
@keyframes aparecer {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.panel {
  background: var(--fondo);
  border: 1px solid var(--gris-100);
  border-radius: var(--radio-sm);
  padding: 22px;
}
.panel.ancho { grid-column: 1 / -1; }
.panel h3 {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--fuente-titulos);
  font-size: 1rem;
  color: var(--azul-800);
  margin-bottom: 12px;
}
.panel h3 i { color: var(--azul-600); font-size: 1.15rem; }
.panel p { font-size: 0.92rem; color: var(--gris-700); }
.panel ul { list-style: none; display: grid; gap: 9px; }
.panel ul li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 0.92rem;
  color: var(--gris-700);
}
.panel ul li::before {
  content: "";
  flex-shrink: 0;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--dorado);
  margin-top: 8px;
}

.panel.laboratorio { background: var(--dorado-claro); border-color: #F2DEAE; }
.panel.laboratorio h3 i { color: var(--dorado-700); }
.panel.laboratorio .lab-titulo {
  font-weight: 700;
  color: var(--azul-900);
  margin-bottom: 6px;
  font-size: 0.95rem;
}

.panel.materiales { background: var(--azul-50); border-color: var(--azul-100); }

.material-lista { display: grid; gap: 10px; }
.material-enlace {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--blanco);
  border: 1.5px solid var(--azul-200);
  border-radius: var(--radio-sm);
  padding: 13px 16px;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.material-enlace:hover {
  transform: translateY(-2px);
  border-color: var(--azul-600);
  box-shadow: var(--sombra-sm);
}
.material-enlace > i:first-child { font-size: 1.5rem; color: var(--azul-600); }
.material-enlace span { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.material-enlace strong { color: var(--azul-900); font-size: 0.95rem; }
.material-enlace small { color: var(--gris-500); font-size: 0.8rem; }
.material-enlace > i:last-child { color: var(--azul-500); font-size: 1.1rem; }

/* Vista previa de la presentación */
.material-presentacion {
  display: grid;
  grid-template-columns: minmax(0, 300px) 1fr;
  gap: 18px;
  align-items: start;
}
.preview-diapositiva {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  border: 1px solid var(--azul-100);
  border-radius: var(--radio-sm);
  overflow: hidden;
  cursor: pointer;
  background: var(--azul-900);
  aspect-ratio: 16 / 9;
  box-shadow: var(--sombra-sm);
}
.preview-diapositiva img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.35s ease;
}
.preview-diapositiva:hover img { transform: scale(1.05); }
.preview-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(6, 42, 74, 0.34);
  transition: background 0.2s ease;
}
.preview-diapositiva:hover .preview-overlay { background: rgba(6, 42, 74, 0.5); }
.preview-boton {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--blanco);
  color: var(--azul-700);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 10px 18px;
  border-radius: 999px;
  box-shadow: 0 6px 18px rgba(6, 42, 74, 0.28);
  transition: transform 0.2s ease;
}
.preview-diapositiva:hover .preview-boton { transform: translateY(-2px); }
.preview-boton i { color: var(--azul-600); font-size: 1.05rem; }

.material-acciones { display: grid; gap: 10px; }
.material-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--gris-500);
  margin-bottom: 2px;
}
.material-meta i { color: var(--azul-500); font-size: 1rem; }

/* Visor a pantalla completa (lightbox) */
.visor {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(5, 17, 33, 0.95);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  flex-direction: column;
}
.visor[hidden] { display: none; }
.visor-barra {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  flex-shrink: 0;
}
.visor-titulo {
  flex: 1;
  min-width: 0;
  color: var(--blanco);
  font-family: var(--fuente-titulos);
  font-size: 0.95rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.visor-contador {
  color: var(--azul-200);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}
.visor-descarga {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--blanco);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 999px;
  padding: 7px 14px;
  flex-shrink: 0;
  transition: background 0.2s ease;
}
.visor-descarga:hover { background: rgba(255, 255, 255, 0.12); }
.visor-cerrar {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.12);
  color: var(--blanco);
  font-size: 1.3rem;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: background 0.2s ease;
}
.visor-cerrar:hover { background: rgba(255, 255, 255, 0.25); }
.visor-escenario {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 76px 24px;
  min-height: 0;
}
.visor-img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}
.visor-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.14);
  color: var(--blanco);
  font-size: 1.5rem;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: background 0.2s ease, transform 0.2s ease;
}
.visor-nav:hover { background: rgba(255, 255, 255, 0.3); }
.visor-nav:disabled { opacity: 0.25; cursor: default; }
.visor-nav:not(:disabled):hover { transform: translateY(-50%) scale(1.08); }
.visor-prev { left: 16px; }
.visor-next { right: 16px; }

@media (max-width: 640px) {
  .material-presentacion { grid-template-columns: 1fr; }
  .visor-escenario { padding: 0 12px 16px; }
  .visor-nav { width: 42px; height: 42px; font-size: 1.25rem; }
  .visor-prev { left: 6px; }
  .visor-next { right: 6px; }
  .visor-titulo { font-size: 0.85rem; }
  .visor-descarga span { display: none; }
}
.material-pendiente {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--blanco);
  border: 1.5px dashed var(--azul-200);
  border-radius: var(--radio-sm);
  padding: 14px 16px;
  font-size: 0.9rem;
  color: var(--gris-500);
}
.material-pendiente i { font-size: 1.25rem; color: var(--azul-500); }

/* Animación de aparición --------------------------------------------------------------- */
.revelar {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.revelar.visible { opacity: 1; transform: translateY(0); }

/* Responsive ----------------------------------------------------------------------------- */
@media (max-width: 980px) {
  .heroe .contenedor { grid-template-columns: 1fr; gap: 64px; padding-block: 72px 88px; }
  .heroe-visual { max-width: 460px; margin-inline: auto; width: 100%; }
  .modulo-grid, .evaluacion-grid { grid-template-columns: 1fr; }
  .pie-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 1080px) {
  .boton-menu { display: block; }
  .navegacion {
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--blanco);
    border-bottom: 1px solid var(--gris-100);
    box-shadow: var(--sombra-md);
    display: none;
    padding: 14px;
  }
  .navegacion.abierta { display: block; }
  .navegacion ul { flex-direction: column; align-items: stretch; gap: 4px; }
  .navegacion a { display: block; border-radius: var(--radio-sm); }
  .navegacion a.nav-cta { margin-left: 0; text-align: center; }
}

@media (max-width: 820px) {
  .cifras .contenedor { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .clase-cuerpo { grid-template-columns: 1fr; }
  .docente-tarjeta { flex-direction: column; text-align: center; }
  .desglose-fila { grid-template-columns: 130px 1fr 48px; }
}

@media (max-width: 520px) {
  .seccion { padding-block: 64px; }
  .heroe-acciones .boton { width: 100%; justify-content: center; }
  .pie-grid { grid-template-columns: 1fr; }
  .chip-flotante.ia-chip { left: -8px; }
  .chip-flotante.quimica { right: -6px; }
  .marca .marca-texto span { display: none; }
  .marca .marca-texto strong { max-width: 240px; font-size: 0.8rem; }
}