/* ============================================================
   Geometría del espacio: piensa en 3D
   Hoja de estilos principal
   - Tokens de diseño
   - Estructura: cabecera, portada, ruta, lección, práctica
   - Componentes didácticos: definición, teorema, fórmula, ejemplo
   - Visor 3D / alternativa 2D, avatar guía, ejercicios
   - Adaptabilidad (móvil, tableta) y movimiento reducido
   ============================================================ */

/* ---------- 1. Tokens ---------- */
:root {
  --paper: #f8fafc;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --surface-3: #e2e8f0;

  --ink: #0f172a;
  --ink-2: #334155;
  --ink-3: #64748b;

  --line: #e2e8f0;
  --line-2: #cbd5e1;

  --primary: #4f46e5;
  --primary-2: #6366f1;
  --primary-soft: #eef2ff;
  --primary-ink: #312e81;

  --accent: #0284c7;
  --accent-2: #06b6d4;
  --accent-soft: #f0f9ff;

  --teal: #059669;
  --teal-soft: #ecfdf5;

  --danger: #dc2626;
  --danger-soft: #fef2f2;

  --gold: #d97706;
  --gold-soft: #fffbeb;

  --radius: 20px;
  --radius-sm: 12px;
  --radius-xs: 8px;

  --shadow-1: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-2: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);

  --max: 1320px;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: "Outfit", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --trans: 180ms cubic-bezier(.2, .7, .3, 1);
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Fondo geométrico muy discreto, decoración que no compite con el texto */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(circle at 12% -10%, rgba(79, 70, 229, .06), transparent 55%),
    radial-gradient(circle at 92% 4%, rgba(6, 182, 212, .05), transparent 45%);
}

img, svg { max-width: 100%; }

h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--ink);
  margin: 0 0 .5em;
}

h1 { font-size: clamp(1.85rem, 4.2vw, 2.9rem); }
h2 { font-size: clamp(1.35rem, 2.6vw, 1.75rem); }
h3 { font-size: 1.15rem; }

p { margin: 0 0 1em; }

a { color: var(--primary); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--primary-2); }

ul, ol { margin: 0 0 1em; padding-left: 1.35em; }
li { margin-bottom: .35em; }

strong { font-weight: 600; }

/* Accesibilidad: foco visible y salto de contenido */
:focus-visible {
  outline: 3px solid var(--primary-2);
  outline-offset: 2px;
  border-radius: 4px;
}

.salto-contenido {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 60;
  background: var(--ink);
  color: #fff;
  padding: .6rem 1rem;
  border-radius: var(--radius-xs);
  transition: top var(--trans);
}
.salto-contenido:focus { top: 12px; color: #fff; }

.visualmente-oculto {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.wrap {
  width: min(100% - 2.4rem, var(--max));
  margin-inline: auto;
  position: relative;
  z-index: 1;
}

/* ---------- 2. Cabecera ---------- */
.sitio-head {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(1.5) blur(14px);
  -webkit-backdrop-filter: saturate(1.5) blur(14px);
  border-bottom: 1px solid var(--line);
}

.sitio-head .wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 64px;
  flex-wrap: wrap;
  padding-block: .45rem;
}

.marca {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -.02em;
  margin-right: auto;
}
.marca:hover { color: var(--ink); }
.marca svg { flex: 0 0 auto; }
.marca span small {
  display: block;
  font-size: .68rem;
  font-weight: 500;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--ink-3);
  line-height: 1.1;
}
.marca span b { font-size: 1.02rem; font-weight: 600; }

.nav-principal {
  display: flex;
  align-items: center;
  gap: .2rem;
  flex-wrap: wrap;
}
.nav-principal a {
  text-decoration: none;
  color: var(--ink-2);
  font-size: .9rem;
  font-weight: 500;
  padding: .45rem .7rem;
  border-radius: var(--radius-xs);
  transition: background var(--trans), color var(--trans);
}
.nav-principal a:hover { background: var(--surface-2); color: var(--ink); }
.nav-principal a[aria-current="page"] {
  background: var(--primary-soft);
  color: var(--primary-ink);
  font-weight: 600;
}

.insignia-progreso {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 999px;
  padding: .28rem .7rem .28rem .35rem;
  font-size: .8rem;
  color: var(--ink-2);
  text-decoration: none;
  font-weight: 500;
}
.insignia-progreso:hover { border-color: var(--line-2); color: var(--ink); }
.anillo {
  width: 30px; height: 30px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: .68rem;
  font-weight: 700;
  color: var(--primary-ink);
  background: conic-gradient(var(--primary) calc(var(--p, 0) * 1%), var(--surface-3) 0);
  position: relative;
}
.anillo::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  background: var(--surface);
}
.anillo span { position: relative; z-index: 1; }

.btn-movimiento {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-2);
  border-radius: 999px;
  padding: .35rem .7rem;
  font: inherit;
  font-size: .78rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  transition: border-color var(--trans), color var(--trans), background var(--trans);
}
.btn-movimiento:hover { border-color: var(--line-2); color: var(--ink); }
.btn-movimiento[aria-pressed="true"] {
  background: var(--primary-soft);
  border-color: var(--primary-soft);
  color: var(--primary-ink);
}

/* ---------- 3. Botones ---------- */
.btn {
  --btn-bg: var(--primary);
  --btn-fg: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  border: 1px solid transparent;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font: inherit;
  font-size: .94rem;
  font-weight: 500;
  padding: .7rem 1.15rem;
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--trans), box-shadow var(--trans), background var(--trans), border-color var(--trans), color var(--trans);
  box-shadow: 0 1px 2px rgba(17, 22, 40, .12);
}
.btn:hover { background: var(--primary-2); color: #fff; transform: translateY(-1px); box-shadow: 0 6px 18px -10px rgba(44, 60, 158, .8); }
.btn:active { transform: translateY(0); }

.btn.secundario {
  --btn-bg: var(--surface);
  --btn-fg: var(--ink);
  border-color: var(--line-2);
  box-shadow: none;
}
.btn.secundario:hover { background: var(--surface-2); color: var(--ink); border-color: var(--ink-3); }

.btn.suave {
  --btn-bg: var(--primary-soft);
  --btn-fg: var(--primary-ink);
  box-shadow: none;
}
.btn.suave:hover { background: #dfe3fb; color: var(--primary-ink); }

.btn.pequeno { font-size: .82rem; padding: .45rem .8rem; }
.btn[disabled] { opacity: .55; cursor: not-allowed; transform: none; }

.enlace-flecha {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  font-weight: 500;
  font-size: .9rem;
  text-decoration: none;
  color: var(--primary);
}
.enlace-flecha:hover { gap: .55rem; }

/* ---------- 4. Portada ---------- */
.hero {
  padding: clamp(1.8rem, 3.5vw, 3rem) 0 2.2rem;
  position: relative;
}
.hero .wrap {
  display: grid;
  grid-template-columns: minmax(340px, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(1.6rem, 2.8vw, 2.6rem);
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .74rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid #c7d2fe;
  border-radius: 999px;
  padding: .35rem .9rem;
  margin-bottom: 1rem;
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.08);
}

.hero h1 {
  font-size: clamp(2.1rem, 4.2vw, 3.25rem);
  letter-spacing: -.035em;
  line-height: 1.08;
  margin-bottom: .85rem;
  font-weight: 700;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
  white-space: nowrap;
}

.hero .entradilla {
  font-size: clamp(.98rem, 1.35vw, 1.08rem);
  color: var(--ink-2);
  max-width: 44ch;
  margin-bottom: 1.4rem;
  line-height: 1.58;
}

.hero-acciones { display: flex; flex-wrap: wrap; gap: .7rem; align-items: center; }

.hero-datos {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
  margin-top: 1.5rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}
.hero-datos div {
  font-size: .78rem;
  color: var(--ink-3);
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
}
.hero-datos strong {
  display: block;
  font-size: 1.35rem;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.1;
  margin-bottom: 2px;
}

.hero-figura {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 0;
  margin: 0;
  box-shadow: 0 20px 40px -15px rgba(15, 23, 42, 0.12), 0 0 0 1px rgba(226, 232, 240, 0.6);
  overflow: hidden;
  transition: box-shadow var(--trans);
}
.hero-figura:hover {
  box-shadow: 0 25px 50px -12px rgba(79, 70, 229, 0.18), 0 0 0 1px rgba(99, 102, 241, 0.2);
}
.hero-figura svg { display: block; width: 100%; height: auto; }
.hero-figura figcaption {
  font-size: .74rem;
  color: var(--ink-3);
  text-align: center;
  padding: .5rem .8rem;
  border-top: 1px dashed var(--line);
  background: var(--surface-2);
}

/* ---------- 5. Bloques de sección ---------- */
.seccion { padding: 2.6rem 0; }
.seccion-cabeza { margin-bottom: 1.6rem; max-width: 62ch; }
.seccion-cabeza h2 { margin-bottom: .35rem; }
.seccion-cabeza p { color: var(--ink-2); font-size: .98rem; margin: 0; }

.tarjeta {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem 1.35rem;
  box-shadow: var(--shadow-1);
}

/* Continuar donde lo dejé */
.continuar {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 1.1rem;
  align-items: center;
  padding: 1.1rem 1.3rem;
  border-radius: var(--radius);
  background: linear-gradient(105deg, var(--primary) 0%, #3a4bb5 55%, #4a5bd0 100%);
  color: #fff;
  box-shadow: var(--shadow-2);
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}
.continuar::after {
  content: "";
  position: absolute;
  right: -40px; top: -60px;
  width: 200px; height: 200px;
  border-radius: 50%;
  border: 30px solid rgba(255, 255, 255, .07);
  pointer-events: none;
}
.continuar .icono {
  width: 46px; height: 46px;
  border-radius: 13px;
  background: rgba(255, 255, 255, .16);
  display: grid;
  place-items: center;
  flex: 0 0 auto;
}
.continuar h2 { color: #fff; font-size: 1.06rem; margin: 0 0 .1rem; }
.continuar p { margin: 0; font-size: .84rem; color: rgba(255, 255, 255, .78); }
.continuar .btn {
  --btn-bg: #fff;
  --btn-fg: var(--primary-ink);
  box-shadow: none;
  position: relative;
  z-index: 1;
}
.continuar .btn:hover { background: #f3f4ff; color: var(--primary-ink); }

/* ---------- 6. Ruta de módulos ---------- */
.ruta { display: grid; gap: .85rem; }

.modulo {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color var(--trans), box-shadow var(--trans);
  overflow: hidden;
}
.modulo:hover { border-color: var(--line-2); }
.modulo.abierto { box-shadow: var(--shadow-1); border-color: #d6d2c5; }

.modulo-cabeza {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  padding: 1rem 1.15rem;
  cursor: pointer;
  background: none;
  border: 0;
  width: 100%;
  text-align: left;
  font: inherit;
  color: inherit;
}
.modulo-cabeza:hover .modulo-titulo { color: var(--primary); }

.modulo-num {
  width: 42px; height: 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-weight: 600;
  font-size: .95rem;
  background: var(--surface-2);
  color: var(--ink-2);
  border: 1px solid var(--line);
  flex: 0 0 auto;
  transition: background var(--trans), color var(--trans), border-color var(--trans);
}
.modulo.completo .modulo-num {
  background: var(--teal-soft);
  border-color: #bfe4de;
  color: var(--teal);
}
.modulo.actual .modulo-num {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.modulo-titulo {
  font-weight: 600;
  font-size: 1.02rem;
  margin: 0 0 .1rem;
  letter-spacing: -.01em;
  transition: color var(--trans);
}
.modulo-desc {
  font-size: .84rem;
  color: var(--ink-3);
  margin: 0;
}
.modulo-meta {
  display: flex;
  align-items: center;
  gap: .7rem;
  flex-wrap: wrap;
}

.barra {
  width: 84px;
  height: 6px;
  background: var(--surface-3);
  border-radius: 999px;
  overflow: hidden;
  flex: 0 0 auto;
}
.barra > i {
  display: block;
  height: 100%;
  background: var(--primary);
  border-radius: 999px;
  transition: width 400ms cubic-bezier(.2, .7, .3, 1);
}
.barra.verde > i { background: var(--teal); }
.meta-texto { font-size: .74rem; color: var(--ink-3); font-variant-numeric: tabular-nums; white-space: nowrap; }

.modulo-cuerpo {
  border-top: 1px solid var(--line);
  padding: .35rem .6rem .7rem;
  display: none;
}
.modulo.abierto .modulo-cuerpo { display: block; }

.chevron { transition: transform var(--trans); color: var(--ink-3); }
.modulo.abierto .chevron { transform: rotate(180deg); }

.leccion-fila {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: .8rem;
  padding: .6rem .55rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: inherit;
  transition: background var(--trans);
}
.leccion-fila:hover { background: var(--surface-2); }
.leccion-fila + .leccion-fila { border-top: 1px dashed var(--line); }

.estado {
  width: 22px; height: 22px;
  border-radius: 50%;
  border: 1.5px solid var(--line-2);
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  background: var(--surface);
  color: transparent;
  font-size: .7rem;
}
.estado.hecho {
  background: var(--teal);
  border-color: var(--teal);
  color: #fff;
}
.estado.en-curso {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-soft);
  font-weight: 700;
}

.leccion-fila h4 { margin: 0; font-size: .92rem; font-weight: 500; }
.leccion-fila p { margin: 0; font-size: .76rem; color: var(--ink-3); }
.leccion-fila .insignia-mini {
  font-size: .64rem;
  letter-spacing: .07em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--gold);
  background: var(--gold-soft);
  border-radius: 4px;
  padding: .1rem .32rem;
  margin-left: .35rem;
  vertical-align: 1px;
}

/* ---------- 7. Página de lección ---------- */
.migas {
  padding: 1.1rem 0 .2rem;
  font-size: .8rem;
  color: var(--ink-3);
}
.migas a { color: var(--ink-3); text-decoration: none; }
.migas a:hover { color: var(--primary); text-decoration: underline; }
.migas span[aria-hidden] { margin: 0 .4rem; opacity: .6; }

.leccion-cabeza {
  padding: .8rem 0 1.4rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 1.6rem;
}
.leccion-cabeza .etiquetas { display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: .7rem; }
.pildora {
  font-size: .7rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  font-weight: 700;
  padding: .26rem .62rem;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--ink-2);
}
.pildora.insignia { background: var(--gold-soft); color: var(--gold); }
.pildora.mod { background: var(--primary-soft); color: var(--primary-ink); }

.leccion-cabeza h1 { font-size: clamp(1.6rem, 3.6vw, 2.35rem); margin-bottom: .5rem; }
.leccion-cabeza .objetivo {
  font-size: .96rem;
  color: var(--ink-2);
  max-width: 68ch;
  margin: 0;
}

.leccion-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 302px;
  gap: 2.6rem;
  align-items: start;
  padding-bottom: 3rem;
}

.contenido { min-width: 0; font-size: 1.005rem; }
.contenido > * { max-width: 72ch; }
.contenido > .bloque-figura,
.contenido > .bloque-ancho,
.contenido > .reto { max-width: none; }

.aside-leccion {
  position: sticky;
  top: 84px;
  display: grid;
  gap: 1rem;
}

.tarjeta-aside {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: .95rem 1rem;
  box-shadow: var(--shadow-1);
}
.tarjeta-aside h3 {
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 700;
  margin-bottom: .7rem;
}

.indice-leccion { list-style: none; margin: 0; padding: 0; font-size: .84rem; }
.indice-leccion li { margin: 0; }
.indice-leccion a {
  display: block;
  padding: .32rem .5rem;
  border-radius: var(--radius-xs);
  color: var(--ink-2);
  text-decoration: none;
  border-left: 2px solid transparent;
  line-height: 1.35;
}
.indice-leccion a:hover { background: var(--surface-2); color: var(--ink); }
.indice-leccion a.activo {
  color: var(--primary-ink);
  border-left-color: var(--primary);
  background: var(--primary-soft);
  font-weight: 500;
}

.progreso-leccion { font-size: .82rem; color: var(--ink-2); }
.progreso-leccion .barra { width: 100%; margin: .45rem 0 .3rem; }

/* ---------- 8. Bloques didácticos ---------- */
.bloque { margin: 0 0 1.9rem; scroll-margin-top: 96px; }
.bloque > h2,
.bloque > h3 { margin-bottom: .6rem; }

.bloque-titulo-num {
  display: inline-block;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .35rem;
}

p.parrafo { margin-bottom: 1.05rem; }

/* matemática en línea */
.m {
  font-family: var(--mono);
  font-size: .93em;
  letter-spacing: -.01em;
  color: var(--ink);
  white-space: nowrap;
}
.m var, var {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.06em;
}
sub, sup { font-size: .72em; line-height: 0; }

/* Definición */
.def {
  border-left: 3px solid var(--primary);
  background: linear-gradient(90deg, var(--primary-soft), rgba(232, 234, 250, .25) 60%, transparent);
  padding: .9rem 1.1rem .9rem 1.05rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.def h3 {
  font-size: .74rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--primary-ink);
  margin-bottom: .4rem;
  font-weight: 700;
}
.def h3 + p { margin-top: 0; }
.def p:last-child { margin-bottom: 0; }

/* Teorema */
.teo {
  border: 1px solid var(--line);
  border-top: 3px solid var(--ink);
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 1rem 1.15rem;
}
.teo h3 {
  font-size: .95rem;
  font-weight: 600;
  margin-bottom: .45rem;
}
.teo .enunciado { font-size: .98rem; }
.teo .justifica {
  margin-top: .8rem;
  padding-top: .7rem;
  border-top: 1px dashed var(--line);
  font-size: .9rem;
  color: var(--ink-2);
}
.teo .justifica strong {
  display: block;
  font-size: .68rem;
  letter-spacing: .11em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: .25rem;
}
.teo p:last-child { margin-bottom: 0; }

/* Fórmulas */
.fml {
  background: var(--ink);
  color: #f2f1ec;
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
}
.fml .titulo {
  font-size: .68rem;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: #a9b1cf;
  font-weight: 700;
  margin-bottom: .8rem;
}
.fml dl { margin: 0; display: grid; gap: .7rem; }
.fml dt {
  font-family: var(--mono);
  font-size: 1.02rem;
  color: #fff;
  letter-spacing: .01em;
}
.fml dd {
  margin: .15rem 0 0;
  font-size: .84rem;
  color: #b9c0d8;
  line-height: 1.45;
}
.fml dl > div + div { border-top: 1px solid rgba(255, 255, 255, .1); padding-top: .7rem; }

/* Aviso / nota */
.nota {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .8rem;
  padding: .85rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--line);
  font-size: .92rem;
}
.nota .icono-nota {
  width: 26px; height: 26px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: var(--surface);
  border: 1px solid var(--line);
  font-weight: 700;
  font-size: .8rem;
  color: var(--ink-2);
}
.nota p:last-child { margin-bottom: 0; }
.nota.ojo { background: var(--accent-soft); border-color: #f0dcc2; }
.nota.ojo .icono-nota { background: #fff; border-color: #eed6b6; color: var(--accent); }
.nota.dato { background: var(--teal-soft); border-color: #c6e6e1; }
.nota.dato .icono-nota { background: #fff; border-color: #b6ded8; color: var(--teal); }

/* Ejemplo resuelto */
.ejm {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
}
.ejm-cabeza {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .8rem;
  padding: .9rem 1.1rem;
  background: var(--surface-2);
  border-bottom: 1px solid var(--line);
}
.ejm-cabeza .et {
  font-size: .66rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--teal);
  background: var(--teal-soft);
  border-radius: 5px;
  padding: .2rem .45rem;
  height: fit-content;
  white-space: nowrap;
}
.ejm-cabeza h3 { font-size: .97rem; margin: 0 0 .2rem; font-weight: 600; }
.ejm-cabeza p { margin: 0; font-size: .9rem; color: var(--ink-2); }
.ejm-cuerpo { padding: 1rem 1.1rem; }
.ejm-pasos { list-style: none; margin: 0; padding: 0; counter-reset: paso; }
.ejm-pasos > li {
  position: relative;
  padding-left: 2.1rem;
  padding-bottom: .9rem;
  counter-increment: paso;
  font-size: .95rem;
}
.ejm-pasos > li::before {
  content: counter(paso);
  position: absolute;
  left: 0; top: .1rem;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--primary-soft);
  color: var(--primary-ink);
  font-size: .72rem;
  font-weight: 700;
  display: grid;
  place-items: center;
}
.ejm-pasos > li::after {
  content: "";
  position: absolute;
  left: 10.5px; top: 1.8rem; bottom: .2rem;
  width: 1px;
  background: var(--line);
}
.ejm-pasos > li:last-child::after { display: none; }
.ejm-pasos > li:last-child { padding-bottom: 0; }
.ejm-pasos .paso-titulo {
  display: block;
  font-weight: 600;
  font-size: .85rem;
  color: var(--ink);
  margin-bottom: .15rem;
}
.ejm-pasos p { margin: 0; color: var(--ink-2); font-size: .92rem; }
.ejm-pasos .cuenta {
  display: block;
  margin: .4rem 0 0;
  font-family: var(--mono);
  font-size: .87rem;
  background: var(--surface-2);
  border-left: 2px solid var(--line-2);
  padding: .35rem .6rem;
  border-radius: 0 6px 6px 0;
  color: var(--ink);
  overflow-x: auto;
}
.ejm-respuesta {
  margin-top: .9rem;
  padding: .7rem .9rem;
  border-radius: var(--radius-sm);
  background: var(--teal-soft);
  border: 1px solid #c6e6e1;
  font-size: .93rem;
  color: #08453f;
}
.ejm-respuesta strong { color: #06403a; }

/* Errores frecuentes */
.err-lista { display: grid; gap: .6rem; }
.err {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  font-size: .89rem;
  background: var(--surface);
}
.err .mal, .err .bien { padding: .7rem .85rem; }
.err .mal { background: var(--danger-soft); border-right: 1px solid var(--line); }
.err .bien { background: #eef8f6; }
.err .et {
  display: block;
  font-size: .63rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: .2rem;
}
.err .mal .et { color: var(--danger); }
.err .bien .et { color: var(--teal); }
.err .porque {
  grid-column: 1 / -1;
  padding: .55rem .85rem;
  border-top: 1px solid var(--line);
  background: var(--surface-2);
  font-size: .83rem;
  color: var(--ink-2);
}

/* Tabla */
.tabla-envoltura { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-sm); }
table.datos {
  width: 100%;
  border-collapse: collapse;
  font-size: .88rem;
  background: var(--surface);
  min-width: 420px;
}
table.datos caption {
  caption-side: top;
  text-align: left;
  padding: .6rem .8rem;
  font-size: .78rem;
  color: var(--ink-3);
  background: var(--surface-2);
  border-bottom: 1px solid var(--line);
}
table.datos th, table.datos td {
  padding: .55rem .8rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
table.datos thead th {
  background: var(--surface-2);
  font-weight: 600;
  font-size: .78rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--ink-2);
}
table.datos tbody tr:last-child td { border-bottom: 0; }
table.datos td.m { white-space: nowrap; }

/* ---------- 9. Visor de figuras y Escenario de Clase 3D ---------- */
.bloque-figura { margin: 0 0 2.2rem; }

.figura {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
  box-shadow: var(--shadow-1);
  position: relative;
  margin: 0;
}

.figura.figura-hero-modo {
  border: none;
  box-shadow: none;
  border-radius: 0;
}

/* Barra superior dedicada (fuera del lienzo: nunca tapa la figura) */
.figura-barra-sup {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .65rem;
  padding: .65rem 1rem;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.hud-titulo-wrap {
  display: flex;
  align-items: center;
  gap: .55rem;
  min-width: 0;
}
.hud-badge {
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: linear-gradient(135deg, #4f46e5, #06b6d4);
  color: #fff;
  padding: 3px 9px;
  border-radius: 999px;
  white-space: nowrap;
}
.hud-fig-titulo {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--ink);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.acciones-fig {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-wrap: wrap;
}
.btn-fig-hud {
  border: 1px solid var(--line-2);
  background: var(--surface);
  color: var(--ink-2);
  border-radius: 999px;
  font: inherit;
  font-size: 0.73rem;
  font-weight: 600;
  padding: 4px 10px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 150ms ease;
}
.btn-fig-hud:hover {
  background: var(--primary-soft);
  color: var(--primary);
  border-color: #c7d2fe;
}
.btn-fig-hud[aria-pressed="true"] {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.btn-fig-hud.btn-proyectar {
  background: var(--primary-soft);
  color: var(--primary-ink);
  border-color: #c7d2fe;
}
.btn-fig-hud.btn-proyectar:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* Rejilla del Escenario de Clase: Lienzo 3D + Columna Profesor Vértiz */
.figura-escenario-clase {
  display: grid;
  grid-template-columns: minmax(0, 1.32fr) minmax(270px, 0.88fr);
  align-items: stretch;
}
.figura-col-lienzo {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--surface);
}
.figura-stage-wrap {
  position: relative;
  width: 100%;
  flex: 1;
  overflow: hidden;
  background: radial-gradient(circle at 50% 42%, #ffffff 0%, #f1f5f9 72%, #e2e8f0 100%);
}
.figura.tema-oscuro-visor .figura-stage-wrap {
  background: radial-gradient(circle at 50% 42%, #1e293b 0%, #0f172a 85%);
}

/* Lienzo 3D 100% despejado */
.figura-lienzo {
  position: relative;
  height: clamp(320px, 40vw, 410px);
  touch-action: none;
  cursor: grab;
  width: 100%;
}
.figura-lienzo.lienzo-hero {
  height: clamp(340px, 42vw, 420px);
}
.figura-lienzo.arrastrando { cursor: grabbing; }
.figura-lienzo canvas { display: block; width: 100%; height: 100%; }
.figura-lienzo svg.figura-2d { width: 100%; height: 100%; display: block; }

.figura-aviso {
  position: absolute;
  bottom: 10px;
  right: 12px;
  font-size: 0.68rem;
  font-weight: 500;
  background: rgba(15, 23, 42, 0.68);
  color: #fff;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-radius: 999px;
  padding: 3px 10px;
  pointer-events: none;
  z-index: 4;
}

/* Barra de capas y medidas debajo del lienzo */
.figura-capas {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .38rem;
  padding: .6rem .9rem;
  border-top: 1px solid var(--line);
  background: var(--surface);
}
.figura-capas .et {
  font-size: .64rem;
  letter-spacing: .09em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--ink-3);
  margin-right: .15rem;
}
.btn-pildora-capa {
  border-radius: 999px;
  padding: 3px 9px;
  font-size: 0.72rem;
  font-weight: 600;
  border: 1px solid var(--line-2);
  background: var(--surface);
  color: var(--ink-2);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  transition: all 150ms ease;
}
.btn-pildora-capa:hover {
  background: var(--surface-2);
  color: var(--ink);
}
.btn-pildora-capa[aria-pressed="true"] {
  background: var(--primary-soft);
  border-color: #c7d2fe;
  color: var(--primary-ink);
}
.capa-color-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 5px;
  flex: 0 0 auto;
}
.figura-medidas-chips {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin-left: auto;
}
.chip-medida {
  font-family: var(--mono);
  font-size: .72rem;
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--ink-2);
  padding: 2px 7px;
  border-radius: 6px;
}
.chip-medida b { color: var(--primary-ink); font-weight: 600; }

/* Columna derecha: Panel Docente con Vértiz */
.figura-col-maestro {
  border-left: 1px solid var(--line);
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
  padding: .9rem 1rem;
  display: flex;
  flex-direction: column;
  gap: .75rem;
  justify-content: space-between;
}
.figura-col-maestro.hablando-ahora {
  background: linear-gradient(180deg, #eef2ff 0%, #ffffff 100%);
}

.mm-profesor-cabecera {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: .65rem;
  align-items: center;
  padding-bottom: .65rem;
  border-bottom: 1px solid var(--line);
}
.mm-avatar-slot {
  width: 76px;
  height: 94px;
  position: relative;
  background: radial-gradient(circle at 50% 60%, #eef2ff 0%, transparent 75%);
  border-radius: 12px;
  overflow: visible;
}
.vertiz-stage-mini .mini-escenario {
  position: relative;
  width: 76px;
  height: 94px;
  max-width: none;
  margin: 0;
}
.vertiz-stage-mini .avatar-escena {
  width: 76px;
  height: 94px;
  margin-left: -38px;
  bottom: 2px;
}
.vertiz-stage-mini .avatar-suelo {
  height: 8px;
  bottom: 0;
}

.mm-profesor-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}
.mm-profesor-top {
  display: flex;
  align-items: center;
  gap: 6px;
}
.mm-rol-tag {
  font-size: 0.63rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--primary-soft);
  padding: 2px 7px;
  border-radius: 999px;
}
.mm-profesor-nombre {
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.2;
}
.mm-controles-audio {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 2px;
}
.btn-mm-chip-voz {
  font: inherit;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid var(--line-2);
  background: var(--surface);
  color: var(--ink-2);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  transition: all 140ms ease;
}
.btn-mm-chip-voz:hover {
  background: var(--primary-soft);
  color: var(--primary);
  border-color: #c7d2fe;
}
.btn-mm-chip-voz.voz-activa {
  background: #ecfdf5;
  border-color: #6ee7b7;
  color: #047857;
}

/* Fila de pasos numerados */
.mm-progreso-fila {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  flex-wrap: wrap;
}
.mm-num-tag {
  background: var(--primary);
  color: #fff;
  padding: 2px 8px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.72rem;
  white-space: nowrap;
}
.mm-puntos-lista {
  display: flex;
  align-items: center;
  gap: 4px;
}
.mm-punto-paso {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--line-2);
  background: var(--surface);
  color: var(--ink-3);
  font: inherit;
  font-size: 0.7rem;
  font-weight: 700;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: all 140ms ease;
}
.mm-punto-paso:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.mm-punto-paso.visitado {
  background: var(--primary-soft);
  border-color: #c7d2fe;
  color: var(--primary);
}
.mm-punto-paso.activo {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: 0 2px 6px rgba(79, 70, 229, 0.35);
}

/* Tarjeta de explicación del paso */
.mm-caja-dialogo {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 4px solid var(--primary);
  border-radius: 12px;
  padding: .75rem .9rem;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.04);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}
.mm-dialogo-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: .35rem;
}
.mm-dialogo-titulo {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--ink);
}
.mm-capa-foco {
  display: inline-flex;
  align-items: center;
  font-size: 0.68rem;
  font-weight: 600;
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--ink-2);
  padding: 1px 7px;
  border-radius: 999px;
}
.mm-dialogo-texto {
  font-size: 0.86rem;
  color: var(--ink-2);
  line-height: 1.5;
  margin: 0;
}

/* Guion de pasos clicables de la figura */
.mm-guion-lista {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: auto;
}
.mm-guion-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  text-align: left;
  font: inherit;
  font-size: 0.75rem;
  padding: 5px 8px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink-3);
  cursor: pointer;
  transition: all 140ms ease;
}
.mm-guion-item:hover {
  background: var(--surface-2);
  color: var(--ink);
}
.mm-guion-item.visitado {
  color: var(--ink-2);
}
.mm-guion-item.activo {
  background: var(--primary-soft);
  border-color: #c7d2fe;
  color: var(--primary-ink);
  font-weight: 600;
}
.mm-guion-idx {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--surface-3);
  color: var(--ink-3);
  font-size: 0.66rem;
  font-weight: 700;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.mm-guion-item.visitado .mm-guion-idx {
  background: #e0e7ff;
  color: var(--primary);
}
.mm-guion-item.activo .mm-guion-idx {
  background: var(--primary);
  color: #ffffff;
}
.mm-guion-tit {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Botones de avance del Modo Maestro */
.mm-acciones-fila {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .5rem;
  align-items: center;
}
.btn-mm-nav {
  font: inherit;
  padding: .55rem .85rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 10px;
  border: 1px solid var(--line-2);
  background: var(--surface);
  color: var(--ink-2);
  cursor: pointer;
  transition: all 150ms ease;
  text-align: center;
}
.btn-mm-nav:hover:not([disabled]) {
  background: var(--surface-2);
  color: var(--ink);
  border-color: var(--ink-3);
}
.btn-mm-nav[disabled] {
  opacity: 0.42;
  cursor: not-allowed;
}
.btn-mm-sig {
  background: linear-gradient(135deg, #4f46e5 0%, #3b82f6 100%);
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.32);
  font-weight: 700;
}
.btn-mm-sig:hover:not([disabled]) {
  background: linear-gradient(135deg, #4338ca 0%, #2563eb 100%);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.42);
}
.btn-mm-sig.btn-completado {
  background: linear-gradient(135deg, #059669, #10b981);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.35);
}

.figura-pie {
  padding: .65rem 1rem .75rem;
  border-top: 1px dashed var(--line);
  font-size: .82rem;
  color: var(--ink-2);
  background: var(--surface-2);
}
.figura-pie p { margin: 0; }

/* Modo Proyector (Pantalla completa de aula) */
.figura.modo-proyector {
  position: fixed !important;
  inset: 0 !important;
  z-index: 9999 !important;
  width: 100vw !important;
  height: 100vh !important;
  border-radius: 0 !important;
  border: none !important;
  display: flex;
  flex-direction: column;
  background: var(--surface);
}
.figura.modo-proyector .figura-escenario-clase {
  flex: 1;
  min-height: 0;
  grid-template-columns: minmax(0, 1.6fr) 380px;
}
.figura.modo-proyector .figura-lienzo {
  height: 100% !important;
  min-height: 460px;
}
.figura.modo-proyector .mm-dialogo-titulo { font-size: 1.05rem; }
.figura.modo-proyector .mm-dialogo-texto { font-size: 1.06rem; line-height: 1.6; }
.figura.modo-proyector .btn-mm-nav { font-size: 0.92rem; padding: .7rem 1.1rem; }

/* ---------- 10. Avatar guía ---------- */
.avatar-caja {
  display: grid;
  gap: .65rem;
  justify-items: center;
  text-align: center;
}
.avatar-columna-figura {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .4rem;
}

.avatar-escenario {
  position: relative;
  width: 100%;
  max-width: 170px;
  height: 212px;
  margin-inline: auto;
  isolation: isolate;
}

.avatar-suelo {
  position: absolute;
  left: 8%;
  right: 8%;
  bottom: 0;
  height: 18px;
  border-radius: 50%;
  background: radial-gradient(ellipse at center, rgba(79, 70, 229, .2), rgba(79, 70, 229, 0) 72%);
}

.avatar-ondas-voz {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  height: 14px;
  margin-left: 4px;
  vertical-align: middle;
}
.avatar-ondas-voz span {
  display: block;
  width: 3px;
  height: 4px;
  border-radius: 2px;
  background: #94a3b8;
  transition: height 120ms ease, background 120ms ease;
}
.avatar-escenario.hablando .avatar-ondas-voz span,
.avatar-activo-habla .avatar-ondas-voz span,
.avatar-ondas-voz.activo span {
  animation: onda-ecualizador 520ms ease-in-out infinite alternate;
}
.avatar-ondas-voz .onda-1 { animation-delay: 0ms; }
.avatar-ondas-voz .onda-2 { animation-delay: 130ms; }
.avatar-ondas-voz .onda-3 { animation-delay: 260ms; }
.avatar-ondas-voz .onda-4 { animation-delay: 390ms; }

@keyframes onda-ecualizador {
  0% { height: 4px; background: #06b6d4; }
  50% { height: 14px; background: #4f46e5; }
  100% { height: 7px; background: #3b82f6; }
}

.avatar-controles-fila {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
}
.btn-avatar-control {
  font: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--line-2);
  background: var(--surface);
  color: var(--ink-2);
  cursor: pointer;
  transition: all 150ms ease;
}
.btn-avatar-control:hover {
  background: var(--primary-soft);
  color: var(--primary);
  border-color: #c7d2fe;
}
.btn-probar-voz {
  background: var(--primary-soft);
  border-color: #c7d2fe;
  color: var(--primary-ink);
}
.btn-probar-voz:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.btn-toggle-voz.voz-on {
  background: #ecfdf5;
  border-color: #6ee7b7;
  color: #047857;
}

.avatar-escena {
  position: absolute;
  left: 50%;
  bottom: 8px;
  width: 164px;
  height: 205px;
  margin-left: -82px;
  --dx: 0px;
  --esc: 1;
  transform: translateX(var(--dx)) scale(var(--esc));
  transform-origin: bottom center;
  transition: transform 620ms cubic-bezier(.35, .05, .25, 1);
  will-change: transform;
}
.avatar-escenario.pos-izq .avatar-escena { --dx: -18px; --esc: .95; }
.avatar-escenario.pos-der .avatar-escena { --dx: 18px; --esc: .95; }

.avatar { display: block; width: 100%; height: 100%; overflow: visible; }

/* Puntos de giro exactos para el viewBox 200 x 250 */
.avatar .pierna-izq { transform-box: view-box; transform-origin: 82px 154px; }
.avatar .pierna-der { transform-box: view-box; transform-origin: 118px 154px; }
.avatar .brazo-izq { transform-box: view-box; transform-origin: 72px 102px; }
.avatar .brazo-der { transform-box: view-box; transform-origin: 128px 102px; }
.avatar .cabeza { transform-box: view-box; transform-origin: 100px 88px; }
.avatar .ojo-izq { transform-box: view-box; transform-origin: 85px 58px; }
.avatar .ojo-der { transform-box: view-box; transform-origin: 115px 58px; }
.avatar .boca-abierta { transform-box: view-box; transform-origin: 100px 75px; opacity: 0; }
.avatar .mejilla { opacity: .55; }
.avatar .figura-cuerpo { transform-box: view-box; transform-origin: 100px 228px; }

/* Confeti geométrico */
.avatar-confeti {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 180ms ease-out;
  z-index: 2;
}
.avatar-escenario.fiesta .avatar-confeti { opacity: 1; }
.avatar-confeti i {
  position: absolute;
  top: 46%;
  left: 50%;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--accent-2);
  opacity: 0;
}
.avatar-confeti i:nth-child(2n) { border-radius: 50%; background: var(--teal); }
.avatar-confeti i:nth-child(3n) { background: var(--primary-2); }
.avatar-confeti i:nth-child(1) { --dx: -46px; --dy: -34px; --rot: -140deg; }
.avatar-confeti i:nth-child(2) { --dx: 40px; --dy: -42px; --rot: 150deg; }
.avatar-confeti i:nth-child(3) { --dx: -58px; --dy: 4px; --rot: 90deg; }
.avatar-confeti i:nth-child(4) { --dx: 56px; --dy: 8px; --rot: -80deg; }
.avatar-confeti i:nth-child(5) { --dx: -26px; --dy: -54px; --rot: 220deg; }
.avatar-confeti i:nth-child(6) { --dx: 28px; --dy: -56px; --rot: -210deg; }
.avatar-escenario.fiesta .avatar-confeti i { animation: vertiz-confeti 900ms ease-out forwards; }
.avatar-escenario.fiesta .avatar-confeti i:nth-child(2n) { animation-delay: 60ms; }
.avatar-escenario.fiesta .avatar-confeti i:nth-child(3n) { animation-delay: 120ms; }

.bocadillo {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: .75rem .9rem;
  font-size: .85rem;
  line-height: 1.5;
  color: var(--ink-2);
  width: 100%;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.04);
  text-align: left;
}
.bocadillo-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  margin-bottom: .25rem;
}
.bocadillo-pie {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: .45rem;
  flex-wrap: wrap;
}
.bocadillo p { margin: 0; }
.bocadillo .firma {
  font-size: .66rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 600;
}
.bocadillo .etiqueta-avatar {
  font-size: .65rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--primary);
}
.bocadillo .texto-avatar {
  display: block;
  font-size: .86rem;
  line-height: 1.52;
  color: var(--ink);
}
.avatar-otro {
  font: inherit;
  font-size: .72rem;
  font-weight: 600;
  padding: .26rem .65rem;
  border-radius: 999px;
  border: 1px solid var(--line-2);
  background: var(--surface-2);
  color: var(--primary-ink);
  cursor: pointer;
  transition: background var(--trans), border-color var(--trans);
}
.avatar-otro:hover { background: var(--primary-soft); border-color: #c7d2fe; }
.avatar-otro:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ---------- Estados del personaje ---------- */
.avatar .ojo { animation: vertiz-parpadeo 5.6s infinite; }
.avatar .adorno-cubo { animation: vertiz-flota 5s ease-in-out infinite; }
.avatar .adorno-tri { animation: vertiz-flota 6.4s ease-in-out infinite reverse; }

.estado-camina .avatar .figura-cuerpo { animation: vertiz-paso 480ms ease-in-out infinite; }
.estado-camina .avatar .pierna-izq { animation: vertiz-zancada 480ms ease-in-out infinite; }
.estado-camina .avatar .pierna-der { animation: vertiz-zancada 480ms ease-in-out infinite reverse; }
.estado-camina .avatar .brazo-izq { animation: vertiz-braceo 480ms ease-in-out infinite; }
.estado-camina .avatar .brazo-der { animation: vertiz-braceo 480ms ease-in-out infinite reverse; }

.estado-senala .avatar .brazo-der { animation: vertiz-senala 2.6s ease-in-out infinite; }
.estado-senala .avatar .cabeza { animation: vertiz-mira 2.6s ease-in-out infinite; }

.estado-celebra .avatar .brazo-izq { animation: vertiz-arriba-izq 560ms ease-in-out infinite alternate; }
.estado-celebra .avatar .brazo-der { animation: vertiz-arriba-der 560ms ease-in-out infinite alternate; }
.estado-celebra .avatar .figura-cuerpo { animation: vertiz-salto 560ms ease-in-out infinite alternate; }
.estado-celebra .avatar .boca-linea { opacity: 0; }
.estado-celebra .avatar .boca-abierta { opacity: 1; transform: scaleY(.6); }
.estado-celebra .avatar .mejilla { opacity: .85; }

.estado-anima .avatar .cabeza { animation: vertiz-asiente 1.5s ease-in-out infinite; }
.estado-anima .avatar .brazo-der { animation: vertiz-ofrece 1.5s ease-in-out infinite; }

.estado-piensa .avatar .cabeza { animation: vertiz-cavila 3.6s ease-in-out infinite; }
.estado-piensa .avatar .brazo-der { animation: vertiz-menton 3.6s ease-in-out infinite; }
.estado-piensa .avatar .ojo { animation: vertiz-mira-arriba 3.6s ease-in-out infinite; }

.estado-habla .avatar .boca-linea { opacity: 0; }
.estado-habla .avatar .boca-abierta { opacity: 1; animation: vertiz-habla 280ms steps(3, end) infinite alternate; }
.estado-habla .avatar .cabeza { animation: vertiz-enfasis 900ms ease-in-out infinite; }
.estado-habla .avatar .brazo-izq { animation: vertiz-acompasa 900ms ease-in-out infinite; }

.avatar-escenario.detenido .avatar * { animation-play-state: paused; }

@keyframes vertiz-parpadeo {
  0%, 92%, 100% { transform: scaleY(1); }
  95% { transform: scaleY(.12); }
}
@keyframes vertiz-flota {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}
@keyframes vertiz-paso {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}
@keyframes vertiz-zancada {
  0%, 100% { transform: rotate(14deg); }
  50% { transform: rotate(-14deg); }
}
@keyframes vertiz-braceo {
  0%, 100% { transform: rotate(-11deg); }
  50% { transform: rotate(11deg); }
}
@keyframes vertiz-senala {
  0%, 100% { transform: rotate(0deg); }
  38%, 72% { transform: rotate(-28deg); }
}
@keyframes vertiz-mira {
  0%, 100% { transform: rotate(0deg); }
  38%, 72% { transform: rotate(3.5deg); }
}
@keyframes vertiz-arriba-izq {
  from { transform: rotate(112deg); }
  to { transform: rotate(138deg); }
}
@keyframes vertiz-arriba-der {
  from { transform: rotate(-112deg); }
  to { transform: rotate(-138deg); }
}
@keyframes vertiz-salto {
  from { transform: translateY(0); }
  to { transform: translateY(-7px); }
}
@keyframes vertiz-asiente {
  0%, 100% { transform: rotate(0deg) translateY(0); }
  30% { transform: rotate(-4deg) translateY(-2px); }
  60% { transform: rotate(2deg) translateY(2px); }
}
@keyframes vertiz-ofrece {
  0%, 100% { transform: rotate(0deg); }
  50% { transform: rotate(-24deg); }
}
@keyframes vertiz-cavila {
  0%, 100% { transform: rotate(0deg); }
  50% { transform: rotate(-6deg) translateY(1px); }
}
@keyframes vertiz-menton {
  0%, 100% { transform: rotate(0deg); }
  35%, 75% { transform: rotate(-68deg); }
}
@keyframes vertiz-mira-arriba {
  0%, 100% { transform: translateY(0); }
  35%, 75% { transform: translateY(-2px); }
}
@keyframes vertiz-habla {
  from { transform: scaleY(.25); }
  to { transform: scaleY(1); }
}
@keyframes vertiz-enfasis {
  0%, 100% { transform: rotate(0deg) translateY(0); }
  50% { transform: rotate(-2deg) translateY(-2px); }
}
@keyframes vertiz-acompasa {
  0%, 100% { transform: rotate(0deg); }
  50% { transform: rotate(-12deg); }
}
@keyframes vertiz-confeti {
  0% { transform: translate(0, 0) rotate(0) scale(.5); opacity: 0; }
  15% { opacity: 1; }
  100% { transform: translate(var(--dx, 0), var(--dy, -40px)) rotate(var(--rot, 0deg)) scale(1); opacity: 0; }
}

/* ---------- 10b. Banda de Vértiz en la portada ---------- */
.banda-vertiz { padding-top: 0.5rem; }
.vertiz-marco {
  display: grid;
  grid-template-columns: minmax(340px, 1.05fr) minmax(0, 1fr);
  gap: 2rem;
  align-items: center;
  padding: 1.4rem 1.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.06), 0 0 0 1px rgba(226, 232, 240, 0.8);
}
.vertiz-marco #avatar-guia { min-width: 0; }
.vertiz-marco .avatar-caja {
  display: grid;
  grid-template-columns: 165px minmax(0, 1fr);
  gap: 1rem;
  align-items: center;
  text-align: left;
}
.vertiz-marco .avatar-escenario { max-width: 156px; height: 195px; }
.vertiz-marco .avatar-escena { width: 152px; height: 190px; margin-left: -76px; }
.vertiz-marco .bocadillo { text-align: left; }
.vertiz-texto h3 { font-size: 1.18rem; margin: .45rem 0 .4rem; font-weight: 700; color: var(--ink); }
.vertiz-texto p { font-size: .92rem; color: var(--ink-2); margin: 0 0 .6rem; max-width: 62ch; line-height: 1.6; }
.vertiz-texto .vertiz-nota { font-size: .84rem; color: var(--ink-3); margin-bottom: 0; }

/* ---------- 11. Ejercicios ---------- */
.ejercicio {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 1rem 1.1rem;
  margin: 0 0 1rem;
  scroll-margin-top: 96px;
}
.ejercicio-cabeza {
  display: flex;
  align-items: flex-start;
  gap: .7rem;
  margin-bottom: .6rem;
}
.ejercicio-cabeza .num {
  flex: 0 0 auto;
  width: 26px; height: 26px;
  border-radius: 8px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  font-size: .76rem;
  font-weight: 700;
  color: var(--ink-2);
  font-variant-numeric: tabular-nums;
}
.ejercicio-cabeza h3 { font-size: .95rem; margin: 0; font-weight: 600; }
.ejercicio-cabeza .dificultad {
  margin-left: auto;
  font-size: .64rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--ink-3);
  background: var(--surface-2);
  padding: .18rem .45rem;
  border-radius: 4px;
  white-space: nowrap;
}
.enunciado-ej { font-size: .95rem; margin-bottom: .8rem; }
.enunciado-ej:last-child { margin-bottom: 0; }

.opciones { display: grid; gap: .4rem; margin: 0 0 .8rem; }
.opcion {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .65rem;
  align-items: start;
  padding: .55rem .7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: var(--surface);
  font-size: .92rem;
  transition: border-color var(--trans), background var(--trans);
}
.opcion:hover { border-color: var(--line-2); background: #fdfcf9; }
.opcion input { margin: .22rem 0 0; accent-color: var(--primary); width: 16px; height: 16px; }
.opcion .letra {
  font-weight: 700;
  font-size: .78rem;
  color: var(--ink-3);
  margin-right: .35rem;
}
.opcion.elegida { border-color: var(--primary); background: var(--primary-soft); }
.opcion.correcta { border-color: var(--teal); background: var(--teal-soft); }
.opcion.incorrecta { border-color: var(--danger); background: var(--danger-soft); }
.opcion.bloqueada { cursor: default; }

.campo-respuesta {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  align-items: center;
  margin-bottom: .7rem;
}
.campo-respuesta label { font-size: .82rem; color: var(--ink-2); }
.campo-respuesta input[type="text"] {
  font: inherit;
  font-family: var(--mono);
  font-size: .92rem;
  padding: .42rem .6rem;
  border: 1px solid var(--line-2);
  border-radius: var(--radius-xs);
  background: var(--surface);
  width: 12ch;
  color: var(--ink);
}
.campo-respuesta input[type="text"]:focus { border-color: var(--primary); }
.campo-respuesta .unidad { font-size: .82rem; color: var(--ink-3); }

.acciones-ej { display: flex; flex-wrap: wrap; gap: .45rem; align-items: center; }

.retro {
  margin-top: .8rem;
  padding: .8rem .9rem;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  border: 1px solid var(--line);
  background: var(--surface-2);
}
.retro.ok { background: var(--teal-soft); border-color: #bfe4de; color: #08453f; }
.retro.no { background: var(--danger-soft); border-color: #f3cfcb; color: #671b15; }
.retro .titulo-retro {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-weight: 600;
  margin-bottom: .35rem;
  font-size: .88rem;
}
.retro p { margin: 0 0 .4rem; }
.retro p:last-child { margin-bottom: 0; }
.retro .et-pista {
  font-size: .64rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--accent);
  display: block;
  margin-bottom: .15rem;
}
.pistas { display: grid; gap: .45rem; margin-top: .7rem; }
.pista {
  background: var(--accent-soft);
  border: 1px solid #f0dcc2;
  border-radius: var(--radius-sm);
  padding: .6rem .75rem;
  font-size: .87rem;
  color: #6a3707;
}
.solucion-detalle {
  margin-top: .7rem;
  padding-top: .7rem;
  border-top: 1px dashed var(--line-2);
}
.solucion-detalle ol { margin: 0; padding-left: 1.2rem; font-size: .88rem; color: var(--ink-2); }
.solucion-detalle li { margin-bottom: .4rem; }

/* Retos (revelado progresivo) */
.reto {
  border: 1px solid var(--line);
  border-left: 4px solid var(--gold);
  border-radius: var(--radius);
  background: linear-gradient(180deg, #fffdf5, var(--surface) 30%);
  padding: 1.1rem 1.2rem;
  margin-bottom: 1.1rem;
}
.reto-cabeza {
  display: flex;
  align-items: center;
  gap: .55rem;
  flex-wrap: wrap;
  margin-bottom: .5rem;
}
.reto-cabeza h3 { font-size: 1rem; margin: 0; }
.reto-cabeza .nivel {
  font-size: .62rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  background: var(--gold-soft);
  color: var(--gold);
  border-radius: 4px;
  padding: .2rem .42rem;
}
.reto-cabeza .puntos {
  margin-left: auto;
  font-size: .76rem;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}
.reto .enunciado { font-size: .95rem; }
.reto .botones-reto { display: flex; gap: .45rem; flex-wrap: wrap; margin-top: .3rem; }
.reto .fase {
  margin-top: .75rem;
  padding: .75rem .9rem;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--line);
  font-size: .9rem;
}
.reto .fase[hidden] { display: none; }
.reto .fase h4 {
  font-size: .68rem;
  letter-spacing: .11em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: .35rem;
  font-weight: 700;
}
.reto .fase ol { margin: 0; padding-left: 1.2rem; }
.reto .fase li { margin-bottom: .35rem; color: var(--ink-2); }
.reto .fase li.m { font-family: var(--mono); font-size: .85rem; color: var(--ink); }
.reto .respuesta-final {
  margin-top: .7rem;
  font-size: .9rem;
  background: var(--teal-soft);
  border: 1px solid #c6e6e1;
  border-radius: var(--radius-sm);
  padding: .6rem .75rem;
  color: #08453f;
}

/* Navegación entre lecciones */
.nav-leccion {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .8rem;
  margin-top: 2.2rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
}
.nav-leccion a {
  display: grid;
  gap: .1rem;
  padding: .75rem .9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  text-decoration: none;
  color: var(--ink);
  transition: border-color var(--trans), transform var(--trans);
}
.nav-leccion a:hover { border-color: var(--line-2); transform: translateY(-1px); }
.nav-leccion a .dir {
  font-size: .66rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 700;
}
.nav-leccion a .nom { font-size: .88rem; font-weight: 500; }
.nav-leccion a.siguiente { text-align: right; }
.nav-leccion a.vacio { visibility: hidden; }

.cerrar-leccion {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  margin-top: 1.6rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  background: var(--surface-2);
  border: 1px solid var(--line);
}
.cerrar-leccion p { margin: 0; font-size: .88rem; color: var(--ink-2); }
.cerrar-leccion strong { display: block; font-size: .95rem; color: var(--ink); }

/* ---------- 12. Práctica ---------- */
.practica-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 2.2rem;
  align-items: start;
}
.panel-practica {
  position: sticky;
  top: 84px;
  display: grid;
  gap: 1rem;
}
.marcador {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .5rem;
}
.marcador div {
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  padding: .5rem .6rem;
  text-align: center;
}
.marcador strong {
  display: block;
  font-size: 1.25rem;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.marcador span { font-size: .68rem; color: var(--ink-3); text-transform: uppercase; letter-spacing: .07em; }

.filtros { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: 1.4rem; }
.chip {
  font: inherit;
  font-size: .82rem;
  padding: .35rem .75rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-2);
  cursor: pointer;
  transition: all var(--trans);
}
.chip:hover { border-color: var(--line-2); color: var(--ink); }
.chip[aria-pressed="true"] {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.vacio-aviso {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--ink-3);
  border: 1px dashed var(--line-2);
  border-radius: var(--radius);
  background: var(--surface);
}

/* ---------- 13. Acerca / documentación ---------- */
.doc-seccion { margin-bottom: 2.4rem; }
.prosa { max-width: 74ch; }
.prosa h2 { margin-top: 0; }
.prosa p, .prosa li { color: var(--ink-2); }

.tabla-larga { min-width: 720px; }
.tabla-larga th, .tabla-larga td { font-size: .84rem; }
.tabla-larga td .nota-celda { font-size: .76rem; color: var(--ink-3); display: block; }

.estado-si, .estado-no {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  font-size: .74rem;
  font-weight: 600;
  border-radius: 999px;
  padding: .14rem .5rem;
  white-space: nowrap;
}
.estado-si { background: var(--teal-soft); color: var(--teal); }
.estado-no { background: var(--surface-3); color: var(--ink-3); }

/* ---------- 14. Pie ---------- */
.sitio-pie {
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding: 2.2rem 0 1.4rem;
  margin-top: 2rem;
}
.sitio-pie .wrap {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(0, 1fr));
  gap: 2rem;
}
.sitio-pie h4 {
  font-size: .7rem;
  letter-spacing: .11em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: .5rem;
  font-weight: 700;
}
.sitio-pie ul { list-style: none; margin: 0; padding: 0; font-size: .85rem; }
.sitio-pie a { color: var(--ink-2); text-decoration: none; }
.sitio-pie a:hover { color: var(--primary); text-decoration: underline; }
.sitio-pie .legal {
  grid-column: 1 / -1;
  border-top: 1px solid var(--line);
  padding-top: .9rem;
  font-size: .76rem;
  color: var(--ink-3);
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: space-between;
}
.sitio-pie p { font-size: .85rem; color: var(--ink-2); max-width: 40ch; }

/* ---------- 15. Responsive ---------- */
@media (max-width: 1120px) {
  .hero .wrap {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.5rem;
  }
  .hero-figura {
    max-width: none;
    order: 2;
  }
  .vertiz-marco {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.4rem;
  }
  .leccion-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.6rem;
  }
  .aside-leccion {
    position: static;
    grid-row: 1;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
  .aside-leccion #avatar-guia { grid-column: 1 / -1; }
  .aside-leccion #avatar-guia .avatar-caja {
    grid-template-columns: 116px minmax(0, 1fr);
    align-items: center;
    justify-items: start;
    text-align: left;
    gap: .95rem;
  }
  .aside-leccion #avatar-guia .avatar-escenario { max-width: 108px; height: 135px; margin-inline: 0; }
  .aside-leccion #avatar-guia .avatar-escena { width: 100px; height: 125px; margin-left: -50px; }
  .aside-leccion #avatar-guia .avatar-suelo { height: 12px; }
  .aside-leccion #avatar-guia .bocadillo { width: 100%; }
  .aside-leccion #avatar-guia .bocadillo::before { left: 34px; }
  .practica-layout { grid-template-columns: minmax(0, 1fr); }
  .panel-practica { position: static; }
  .panel-practica .tarjeta-aside:first-child { display: grid; grid-template-columns: minmax(0, 1fr); }
  .sitio-pie .wrap { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .sitio-head .wrap { gap: .5rem; }
  .nav-principal { order: 3; width: 100%; overflow-x: auto; padding-bottom: .3rem; }
  .nav-principal a { white-space: nowrap; }
  .figura-escenario-clase {
    grid-template-columns: minmax(0, 1fr);
  }
  .figura-col-maestro {
    border-left: 0;
    border-top: 1px solid var(--line);
  }
  .figura.modo-proyector .figura-escenario-clase {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 680px) {
  body { font-size: 16.5px; }
  .wrap { width: calc(100% - 1.6rem); }
  .continuar { grid-template-columns: auto minmax(0, 1fr); }
  .continuar .btn { grid-column: 1 / -1; justify-content: center; }
  .modulo-cabeza { grid-template-columns: auto minmax(0, 1fr); }
  .modulo-meta { grid-column: 1 / -1; justify-content: space-between; padding-left: 2px; }
  .modulo-meta .barra { width: 60%; }
  .aside-leccion { grid-template-columns: minmax(0, 1fr); }
  .aside-leccion #avatar-guia { order: -1; }
  .aside-leccion #avatar-guia .avatar-caja {
    grid-template-columns: minmax(0, 1fr);
    justify-items: center;
    text-align: center;
    gap: .5rem;
  }
  .aside-leccion #avatar-guia .avatar-escenario { max-width: 96px; height: 120px; margin-inline: auto; }
  .aside-leccion #avatar-guia .avatar-escena { width: 88px; height: 110px; margin-left: -44px; bottom: 10px; }
  .aside-leccion #avatar-guia .avatar-suelo { height: 9px; bottom: 0; }
  .aside-leccion #avatar-guia .bocadillo::before { display: none; }
  .aside-leccion #avatar-guia .bocadillo .texto-avatar { font-size: .85rem; }
  .bocadillo::before { display: none; }
  .err { grid-template-columns: minmax(0, 1fr); }
  .err .mal { border-right: 0; border-bottom: 1px solid var(--line); }
  .nav-leccion { grid-template-columns: minmax(0, 1fr); }
  .nav-leccion a.siguiente { text-align: left; }
  .hero-datos { gap: 1.1rem; }
  .cerrar-leccion { grid-template-columns: minmax(0, 1fr); }
  .cerrar-leccion .btn { justify-content: center; }
  .figura-lienzo { height: 320px; min-height: 300px; }
  .sitio-pie .wrap { grid-template-columns: 1fr; }
  .migas { padding-top: .8rem; }
  .leccion-cabeza { padding-bottom: 1rem; margin-bottom: 1.2rem; }
  .vertiz-marco {
    grid-template-columns: minmax(0, 1fr);
    gap: 1rem;
    padding: 1.1rem 1rem;
  }
  .vertiz-marco .avatar-caja {
    grid-template-columns: minmax(0, 1fr);
    justify-items: center;
  }
  .vertiz-marco .avatar-escenario { max-width: 140px; height: 175px; }
  .vertiz-marco .avatar-escena { width: 132px; height: 165px; margin-left: -66px; }
  .vertiz-texto { text-align: left; width: 100%; }
}

@media (max-width: 420px) {
  .hero-acciones .btn { width: 100%; }
  .figura-barra-sup .acciones-fig { width: 100%; justify-content: flex-start; }
}

/* ---------- 16. Movimiento reducido ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}

/* La clase permite desactivar el movimiento manualmente desde la cabecera.
   El personaje se queda quieto, pero sigue siendo legible y explicando. */
body.movimiento-reducido .avatar *,
body.movimiento-reducido .avatar-confeti * {
  animation: none !important;
}
body.movimiento-reducido .avatar-escena { transition: none !important; }
body.movimiento-reducido .avatar .boca-abierta { opacity: 0; }
body.movimiento-reducido .estado-habla .avatar .boca-linea,
body.movimiento-reducido .estado-celebra .avatar .boca-linea { opacity: 1; }
body.movimiento-reducido .avatar-escenario.fiesta .avatar-confeti { opacity: 0; }

/* ---------- 17. Impresión ---------- */
@media print {
  .sitio-head, .aside-leccion, .figura-capas, .figura-barra-sup .acciones-fig,
  .figura-col-maestro, .nav-leccion, .sitio-pie, .cerrar-leccion, .btn { display: none !important; }
  body { background: #fff; font-size: 11pt; }
  .leccion-layout, .figura-escenario-clase { display: block; }
  .contenido > * { max-width: none; }
  .figura { break-inside: avoid; }
  .figura-lienzo { height: 240px; }
  a { color: #000; text-decoration: none; }
}