/* =====================================================================
   TOKENS — paleta tomada de la captura de referencia (rosa / ciruela / dorado)
   ===================================================================== */
:root{
  --color-bg:#FFFFFF;
  --color-bg-alt:#FBF5F9;
  --color-surface:#FFFFFF;
  --color-ink:#232326;
  --color-ink-soft:#6B7280;
  --color-heading:#3D1638;

  --color-primary:#C13C84;
  --color-primary-dark:#9B2E69;
  --color-primary-light:#FDF0F7;

  --color-plum:#5A1F53;
  --color-plum-dark:#3D1638;

  --color-gold:#DFA83E;
  --color-gold-dark:#B8842B;
  --color-gold-light:#FBF0DC;

  --color-ok:#1F6F43;
  --color-ok-bg:#E4F3EA;
  --color-error:#A1231C;
  --color-error-bg:#FBE7E5;

  --color-focus:#3D1638;
  --color-border:#E9DEE6;

  --font-body: 'Atkinson Hyperlegible', system-ui, sans-serif;
  --font-display: 'Atkinson Hyperlegible Next', 'Atkinson Hyperlegible', system-ui, sans-serif;

  --step-size: 1;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --max-width: 1160px;

  --shadow-card: 0 8px 24px rgba(61, 22, 56, 0.08);
}

body.high-contrast{
  --color-bg:#000000;
  --color-bg-alt:#0A0A0A;
  --color-surface:#000000;
  --color-ink:#FFFFFF;
  --color-ink-soft:#F5F5F5;
  --color-heading:#FFFFFF;
  --color-primary:#FF7FC0;
  --color-primary-dark:#FF7FC0;
  --color-primary-light:#3A0F2C;
  --color-plum:#000000;
  --color-plum-dark:#000000;
  --color-gold:#FFD400;
  --color-gold-dark:#FFD400;
  --color-gold-light:#3A2F00;
  --color-ok:#7CFF9E;
  --color-ok-bg:#0F3A1E;
  --color-error:#FF8A80;
  --color-error-bg:#3A0F0C;
  --color-border:#FFFFFF;
  --color-focus:#00E5FF;
}
body.high-contrast .site-header{ border-bottom:3px solid var(--color-primary); }
body.high-contrast .route{ border:2px solid var(--color-gold); }

/* =====================================================================
   RESET & BASE
   ===================================================================== */
*, *::before, *::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *, *::before, *::after{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; scroll-behavior:auto !important; }
}

[hidden]{
  display: none !important;
}

body{
  margin:0;
  font-family:var(--font-body);
  background:var(--color-bg);
  color:var(--color-ink);
  font-size:calc(1rem * var(--step-size));
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{
  font-family:var(--font-display);
  color:var(--color-heading);
  line-height:1.15;
  margin:0 0 0.6em;
  font-weight:800;
}

h1{ font-size:clamp(2.1rem, 4vw + 1rem, 3.4rem); }
h2{ font-size:clamp(1.6rem, 2.4vw + 1rem, 2.3rem); }
h3{ font-size:1.3rem; color:var(--color-primary); }
h4{ font-size:1.05rem; color:var(--color-plum); }

p{ margin:0 0 1em; max-width:70ch; color:var(--color-ink); }

a{ color:var(--color-primary); }

ul, ol{ padding-left:1.2em; }
img{ max-width:100%; display:block; }

.brand__icon-img{
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;   /* recorta la imagen para que llene el círculo sin deformarse */
  display: block;
}

:focus{ outline:none; }
:focus-visible{
  outline:3px solid var(--color-focus);
  outline-offset:3px;
  border-radius:4px;
  box-shadow:0 0 0 5px rgba(255,255,255,0.85);
}
body.high-contrast :focus-visible{ box-shadow:none; }

.sr-only{
  position:absolute; width:1px; height:1px; padding:0; margin:-1px;
  overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0;
}

.skip-link{
  position:absolute; left:1rem; top:-4rem;
  background:var(--color-primary); color:#fff; padding:0.75em 1.2em;
  border-radius:0 0 var(--radius-sm) var(--radius-sm);
  z-index:1000; font-weight:700; transition:top .2s ease;
}
.skip-link:focus{ top:0; }

/* =====================================================================
   ACCESSIBILITY TOOLBAR
   ===================================================================== */
.a11y-bar{ background:var(--color-plum-dark); color:#fff; }
.a11y-bar__inner{
  max-width:var(--max-width); margin:0 auto; padding:0.5em 1.2em;
  display:flex; flex-wrap:wrap; gap:0.5em; align-items:center; font-size:0.85rem;
}
.a11y-bar__label{ opacity:0.85; margin-right:0.3em; }
.a11y-btn{
  background:transparent; color:#fff; border:1.5px solid rgba(255,255,255,0.5);
  border-radius:999px; padding:0.3em 0.9em; font-family:var(--font-body);
  font-size:0.85rem; cursor:pointer; font-weight:700;
}
.a11y-btn:hover{ background:rgba(255,255,255,0.15); }
.a11y-btn[aria-pressed="true"]{ background:var(--color-gold); border-color:var(--color-gold); color:var(--color-plum-dark); }
.a11y-btn--link{ text-decoration:underline; border-color:transparent; }

/* =====================================================================
   HEADER & NAV — dos filas: marca+código, luego menú con pestaña activa en píldora
   ===================================================================== */
.site-header{
  background:var(--color-surface);
  position:sticky; top:0; z-index:100;
  border-bottom:1px solid var(--color-border);
}
.site-header__top{
  max-width:var(--max-width); margin:0 auto; padding:0.9em 1.2em 0.7em;
  display:flex; align-items:center; justify-content:space-between; gap:1em;
  border-bottom:1px solid var(--color-border);
}
.brand{ display:flex; align-items:center; gap:0.7em; text-decoration:none; }
.brand__text{ display:flex; flex-direction:column; line-height:1.2; }
.brand__text strong{ color:var(--color-ink); font-family:var(--font-display); font-size:1.1rem; }
.brand__text small{ color:var(--color-ink-soft); font-size:0.78rem; }

.site-header__meta{ display:flex; align-items:center; gap:1.2em; }
.project-code{ color:var(--color-ink-soft); font-size:0.85rem; white-space:nowrap; }

.nav-toggle{
  display:flex; align-items:center; gap:0.5em; background:none;
  border:1.5px solid var(--color-border); border-radius:var(--radius-sm);
  padding:0.45em 0.9em; cursor:pointer; font-family:var(--font-body);
  font-weight:700; color:var(--color-ink); font-size:0.9rem;
}
.nav-toggle__bars, .nav-toggle__bars::before, .nav-toggle__bars::after{
  display:block; width:18px; height:2px; background:var(--color-ink); position:relative;
}
.nav-toggle__bars::before{ content:""; top:-5px; }
.nav-toggle__bars::after{ content:""; top:3px; }

.main-nav{ max-width:var(--max-width); margin:0 auto; padding:0.6em 1.2em; }
.main-nav ul{
  list-style:none; display:flex; gap:0.5em; margin:0; padding:0; flex-wrap:wrap;
}
.main-nav a{
  display:inline-block; color:var(--color-ink); text-decoration:none; font-weight:700;
  font-size:0.95rem; padding:0.5em 1.1em; border-radius:999px; border:1.5px solid transparent;
}
.main-nav a:hover{ background:var(--color-primary-light); }
.main-nav a.is-active{
  background:var(--color-primary-light); border-color:var(--color-primary); color:var(--color-primary);
}

@media (min-width:881px){ .nav-toggle{ display:none; } }
@media (max-width: 880px){
  .main-nav{ display:none; }
  .main-nav.is-open{ display:block; }
  .main-nav ul{ flex-direction:column; gap:0.3em; }
  .main-nav a{ display:block; }
}

/* =====================================================================
   PÁGINAS (navegación por pestañas, sin scroll de ancla)
   ===================================================================== */
.page{ display:block; }
.page[hidden]{ display:none; }
.page:focus{ outline:none; } /* el foco es para lectores de pantalla, no necesita marco visual en todo el bloque */

.section{ padding:4.5em 1.2em; }
.section--alt{ background:var(--color-bg-alt); }
.section__inner{ max-width:var(--max-width); margin:0 auto; }
.section__lead{ font-size:1.05rem; max-width:70ch; }

.eyebrow{
  font-family:var(--font-display); font-weight:800; letter-spacing:0.02em;
  color:var(--color-primary); font-size:0.85rem; margin:0 0 0.6em; text-transform:uppercase;
}

.grid-3{ display:grid; grid-template-columns:repeat(3, 1fr); gap:1.5em; margin:2em 0; }
@media (max-width: 880px){ .grid-3{ grid-template-columns:1fr; } }

.two-col{ display:grid; grid-template-columns:1fr 1.2fr; gap:2.5em; align-items:start; margin:2em 0; }
@media (max-width: 880px){ .two-col{ grid-template-columns:1fr; } }

/* =====================================================================
   HERO — fondo blanco, título ciruela, acentos rosa/dorado
   ===================================================================== */
.hero{ background:var(--color-bg); padding:4.5em 1.2em; }
.hero__inner{
  max-width:var(--max-width); margin:0 auto; display:grid;
  grid-template-columns:1.3fr 1fr; gap:3em; align-items:center;
}
@media (max-width: 880px){ .hero__inner{ grid-template-columns:1fr; } }
.hero__lead{ color:var(--color-ink-soft); font-size:1.1rem; }
.hero__actions{ display:flex; gap:1em; flex-wrap:wrap; margin:1.5em 0; }
.hero__tags{ list-style:none; display:flex; flex-wrap:wrap; gap:0.6em; padding:0; margin:1.5em 0 0; }
.hero__tags li{
  background:var(--color-primary-light); border:1px solid var(--color-primary);
  color:var(--color-primary); padding:0.4em 0.9em; border-radius:999px; font-size:0.85rem; font-weight:700;
}

.hero__visual{ display:flex; flex-direction:column; align-items:center; gap:1em; }
.fraction-card{
  background:var(--color-plum); color:#fff; border-radius:var(--radius-lg);
  width:min(220px, 60vw); padding:1.5em; text-align:center; box-shadow:var(--shadow-card);
  position:relative; overflow:hidden;
}
.fraction-card::after{
  content:""; position:absolute; top:0; right:0; width:0; height:0;
  border-style:solid; border-width:0 34px 34px 0; border-color:transparent var(--color-gold) transparent transparent;
}
.fraction-card__num, .fraction-card__den{ font-family:var(--font-display); font-weight:800; font-size:3rem; }
.fraction-card__line{ height:4px; background:var(--color-gold); margin:0.3em auto; width:60%; border-radius:2px; }
.fraction-card__caption{ color:var(--color-ink-soft); font-weight:700; text-align:center; }

/* =====================================================================
   BUTTONS
   ===================================================================== */
.btn{
  display:inline-block; font-family:var(--font-display); font-weight:700;
  padding:0.75em 1.5em; border-radius:999px; text-decoration:none; border:2px solid transparent;
  cursor:pointer; font-size:1rem;
}
.btn--primary{ background:var(--color-primary); color:#fff; }
.btn--primary:hover{ background:var(--color-primary-dark); }
.btn--ghost{ background:transparent; border-color:var(--color-primary); color:var(--color-primary); }
.btn--ghost:hover{ background:var(--color-primary-light); }
.btn--secondary{ background:var(--color-plum); color:#fff; }
.btn--secondary:hover{ background:var(--color-plum-dark); }
a.btn[aria-disabled="true"]{ opacity:0.55; cursor:not-allowed; pointer-events:none; }

.status-note{ font-size:0.85rem; font-style:italic; margin-top:0.6em; color:var(--color-ink-soft); }

/* =====================================================================
   CARDS
   ===================================================================== */
.info-card, .practice-card{
  background:var(--color-surface); border:1px solid var(--color-border);
  border-radius:var(--radius-md); padding:1.6em; box-shadow:var(--shadow-card);
}
.practice-card{ display:flex; flex-direction:column; gap:0.6em; align-items:flex-start; }
.practice-card__num{
  font-family:var(--font-display); font-weight:800; font-size:1.4rem;
  background:var(--color-plum); color:#fff; border-radius:50%; width:2.4em; height:2.4em;
  display:flex; align-items:center; justify-content:center;
}

/* =====================================================================
   PROYECTO — texto + tarjeta "ruta" en morado con números dorados
   ===================================================================== */
.route-layout{
  display:grid; grid-template-columns:1fr 1fr; gap:2.5em; align-items:start; margin-top:2.5em;
}
@media (max-width:880px){ .route-layout{ grid-template-columns:1fr; } }

.route{
  background:var(--color-plum); color:#fff; border-radius:var(--radius-lg);
  padding:1.8em; position:relative; overflow:hidden;
}
.route::after{
  content:""; position:absolute; top:0; right:0; width:0; height:0;
  border-style:solid; border-width:0 40px 40px 0; border-color:transparent var(--color-gold) transparent transparent;
}
.route__title{ color:var(--color-gold); margin-bottom:0.9em; }
.route__steps{ list-style:none; padding:0; margin:0; display:flex; flex-direction:column; }
.route__steps li{
  display:flex; align-items:center; gap:0.9em; font-weight:700; color:#fff;
  padding:0.8em 0; border-top:1px solid rgba(255,255,255,0.18);
}
.route__steps li:first-child{ border-top:none; }
.route__num{
  display:inline-flex; align-items:center; justify-content:center; width:2em; height:2em;
  background:var(--color-gold); color:var(--color-plum-dark); border-radius:50%;
  font-family:var(--font-display); flex-shrink:0;
}

/* =====================================================================
   CHECK LIST / CALLOUT
   ===================================================================== */
.check-list{ list-style:none; padding:0; display:flex; flex-direction:column; gap:0.6em; }
.check-list li{ padding-left:1.8em; position:relative; color:var(--color-ink); font-weight:600; }
.check-list li::before{ content:"✓"; position:absolute; left:0; color:var(--color-ok); font-weight:900; }

.callout{
  display:flex; gap:1em; align-items:flex-start; background:var(--color-gold-light);
  border-radius:var(--radius-md); padding:1.4em; margin:2em 0 1em; border:1px solid var(--color-border);
}
.callout__icon{
  font-size:1.4rem; background:var(--color-gold-dark); color:#fff; width:2em; height:2em;
  border-radius:50%; display:flex; align-items:center; justify-content:center; flex-shrink:0;
}
.callout h3{ margin-bottom:0.3em; color:var(--color-plum); }
.callout p{ margin:0; }

/* =====================================================================
   TABS (Aprende con GeoGebra) — píldoras, igual criterio visual que el menú
   ===================================================================== */
.tabs__list{ display:flex; gap:0.8em; flex-wrap:wrap; margin-bottom:2em; }
.tabs__tab{
  font-family:var(--font-display); font-weight:700; background:var(--color-surface);
  border:1.5px solid var(--color-border); border-radius:999px; padding:0.7em 1.3em;
  cursor:pointer; display:flex; align-items:center; gap:0.6em; color:var(--color-ink);
}
.tabs__tab[aria-selected="true"]{
  background:var(--color-primary-light); border-color:var(--color-primary); color:var(--color-primary);
}
.tabs__num{
  display:inline-flex; align-items:center; justify-content:center; width:1.7em; height:1.7em;
  border-radius:50%; background:var(--color-plum); color:#fff; font-size:0.85rem;
}
.tabs__tab[aria-selected="true"] .tabs__num{ background:var(--color-primary); }
.tabs__panel[hidden]{ display:none; }

.example-pair{ display:flex; flex-wrap:wrap; gap:1em; margin:1.5em 0; }
.example-pair--equal{ align-items:center; }
.example-pair__item{
  background:var(--color-surface); border:1px solid var(--color-border); border-radius:var(--radius-md);
  padding:1em 1.3em; display:flex; flex-direction:column; gap:0.3em; min-width:150px;
}
.example-pair__item strong{ font-family:var(--font-display); font-size:1.15rem; color:var(--color-primary); }

.module-media{ display:grid; grid-template-columns:1fr 1fr; gap:2em; margin-top:2em; align-items:start; }
@media (max-width:960px){ .module-media{ grid-template-columns:1fr; } }

/* =====================================================================
   VIDEO PLAYER
   ===================================================================== */
.video-block{ background:var(--color-surface); border:1px solid var(--color-border); border-radius:var(--radius-md); padding:1.3em; }
.video-player__frame{
  position:relative; background:var(--color-plum-dark); border-radius:var(--radius-sm); overflow:hidden;
  aspect-ratio:16/9; display:flex; align-items:center; justify-content:center;
}
.video-player__el{ width:100%; height:100%; object-fit:cover; display:block; background:#000; }
.video-player__placeholder{
  position:absolute; inset:0; display:flex; flex-direction:column; justify-content:center;
  padding:1.5em; color:#fff; text-align:center; background:rgba(61,22,56,0.92);
}
.video-player__placeholder p{ color:#fff; }
.video-player__frame.has-source .video-player__placeholder{ display:none; }

.video-player__controls{ display:flex; align-items:center; gap:0.6em; flex-wrap:wrap; margin-top:0.8em; }
.vp-btn{
  background:var(--color-plum); color:#fff; border:none; border-radius:var(--radius-sm);
  width:2.4em; height:2.4em; display:inline-flex; align-items:center; justify-content:center;
  cursor:pointer; font-weight:700; flex-shrink:0;
}
.vp-btn[aria-pressed="false"]{ background:var(--color-ink-soft); opacity:0.7; }
.vp-btn:hover{ background:var(--color-plum-dark); }
.vp-seek{ flex:1 1 120px; accent-color:var(--color-primary); }
.vp-time{ font-size:0.8rem; font-variant-numeric:tabular-nums; min-width:5.5em; color:var(--color-ink-soft); }
.vp-speed select{
  font-family:var(--font-body); padding:0.4em 0.5em; border-radius:var(--radius-sm);
  border:1.5px solid var(--color-border); background:var(--color-surface); color:var(--color-ink);
}

.transcript{ margin-top:1em; background:var(--color-bg-alt); border-radius:var(--radius-sm); padding:0.8em 1em; }
.transcript summary{ cursor:pointer; font-weight:700; color:var(--color-primary); }
.transcript p{ margin-top:0.8em; }

/* =====================================================================
   GEOGEBRA APPLET BLOCK
   ===================================================================== */
.applet-block{ background:var(--color-surface); border:1px solid var(--color-border); border-radius:var(--radius-md); padding:1.3em; }
.applet-instructions{ font-weight:600; color:var(--color-ink); }
.applet-frame{
  position:relative; width:100%; padding-bottom:62%; border-radius:var(--radius-sm); overflow:hidden;
  border:1px solid var(--color-border); background:#fff;
}
.applet-frame iframe{ position:absolute; inset:0; width:100%; height:100%; border:0; }
.applet-note{ font-size:0.85rem; margin-top:0.8em; color:var(--color-ink-soft); }

/* =====================================================================
   PRACTICE FEEDBACK DEMO
   ===================================================================== */
.feedback-demo{ margin-top:2.5em; }
.feedback-demo__label{ font-weight:700; color:var(--color-ink); }
.feedback-demo__row{ display:flex; gap:1em; flex-wrap:wrap; }
.feedback{ display:inline-flex; align-items:center; gap:0.5em; padding:0.7em 1.1em; border-radius:var(--radius-sm); font-weight:700; }
.feedback--ok{ background:var(--color-ok-bg); color:var(--color-ok); border:1.5px solid var(--color-ok); }
.feedback--error{ background:var(--color-error-bg); color:var(--color-error); border:1.5px solid var(--color-error); }

/* =====================================================================
   ACCORDION (Docentes)
   ===================================================================== */
.accordion__item{
  background:var(--color-surface); border:1px solid var(--color-border); border-radius:var(--radius-md);
  padding:1em 1.3em; margin-bottom:0.8em;
}
.accordion__item summary{ cursor:pointer; font-family:var(--font-display); font-weight:700; font-size:1.05rem; color:var(--color-primary); }
.accordion__item p{ margin-top:0.8em; }

.instruments__title{ margin-top:2em; }
.instruments{ list-style:none; padding:0; display:grid; grid-template-columns:repeat(2,1fr); gap:0.8em; }
@media (max-width:700px){ .instruments{ grid-template-columns:1fr; } }
.instruments a{
  display:flex; justify-content:space-between; gap:1em; background:var(--color-surface);
  border:1px solid var(--color-border); border-radius:var(--radius-sm); padding:0.9em 1.1em;
  text-decoration:none; font-weight:700; color:var(--color-ink);
}
.instruments a span{ color:var(--color-ink-soft); font-weight:400; font-size:0.85rem; }
.instruments a[aria-disabled="true"]{ opacity:0.6; cursor:not-allowed; }

/* =====================================================================
   FOOTER
   ===================================================================== */
.site-footer{ background:var(--color-plum-dark); color:#F3E7F0; padding:3em 1.2em; }
.site-footer a{ color:var(--color-gold); }
.site-footer p{ color:#E2CBDD; }
.site-footer__inner{ max-width:var(--max-width); margin:0 auto; display:grid; grid-template-columns:2fr 1fr 1fr; gap:2em; }
@media (max-width:700px){ .site-footer__inner{ grid-template-columns:1fr; } }
.site-footer__brand{ font-family:var(--font-display); font-weight:800; font-size:1.2rem; color:#fff; }

.footer-container {
    display: flex;
    align-items: center; 
    gap: 15px;
    width: 100%;          /* Asegura que ocupe el ancho disponible */
    box-sizing: border-box;
  }

  /* La imagen mantendrá su tamaño fijo sin deformarse */
  .column-img img {
    max-width: 100%;
    height: auto;
    display: block;
  }

  .column-text {
    flex: 1;              /* Permite que la columna de texto tome todo el espacio restante */
  }

  .column-text p {
    margin: 0;
  }

  .site-footer__brand {
    font-weight: bold;
    margin-bottom: 4px;
  }

  /* Ajustes para pantallas pequeñas (móviles de menos de 480px) */
  @media (max-width: 480px) {
    .footer-container {
      flex-direction: column;   /* Pasa de fila a columna si la pantalla es muy pequeña */
      align-items: flex-start;  /* Alinea todo a la izquierda */
      gap: 10px;
    }
  }

  /* Footer nuevo */
  /* Estilos generales del contenedor del Footer */
  .site-footer {
    background: linear-gradient(135deg, #421b40 0%, #5b2256 100%); /* Fondo morado institucional */
    color: #ffffff;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    padding: 30px 20px;
    width: 100%;
    box-sizing: border-box;
  }

  /* Layout principal con Grid / Flex */
  .site-footer__container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 30px;
  }

  /* Grupo de Brand (Logo + Texto) */
  .site-footer__brand-wrapper {
    display: flex;
    align-items: center;
    gap: 20px;
    flex: 1 1 400px; /* Toma prioridad en espacio */
  }

  /* Contenedor blanco con bordes redondeados para el Logo */
  .site-footer__logo-box {
    background-color: #ffffff;
    padding: 8px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
    flex-shrink: 0;
  }

  .site-footer__logo {
    width: 80px;
    height: 80px;
    object-fit: contain;
  }

  .site-footer__brand-text {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .site-footer__title {
    margin: 0;
    font-size: 1.15rem;
    font-weight: 700;
    color: #ffffff;
  }

  .site-footer__description {
    margin: 0;
    font-size: 0.95rem;
    color: #e2d3e2;
    line-height: 1.4;
    max-width: 380px;
  }

  /* Bloques de información adicional (Investigadora y Código) */
  .site-footer__info-block {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 0 1 auto;
  }

  .site-footer__label {
    font-size: 0.82rem;
    font-weight: 700;
    color: #eab308; /* Color dorado/amarillo exacto */
    letter-spacing: 0.5px;
    text-transform: uppercase;
  }

  .site-footer__value {
    margin: 0;
    font-size: 1rem;
    font-weight: 700;
    color: #ffffff;
  }

  /* Responsivo para móviles y tabletas */
  @media (max-width: 900px) {
    .site-footer__container {
      flex-direction: column;
      align-items: flex-start;
      gap: 25px;
    }

    .site-footer__brand-wrapper {
      flex: 1 1 100%;
    }
  }

  @media (max-width: 480px) {
    .site-footer__brand-wrapper {
      flex-direction: column;
      align-items: flex-start;
      gap: 15px;
    }
    
    .site-footer__logo-box {
      border-radius: 12px;
    }
    
    .site-footer__logo {
      width: 65px;
      height: 65px;
    }
  }

  /* =====================================================================
   ACTIVIDADES DE OPCIÓN MÚLTIPLE (Fracciones equivalentes)
   ===================================================================== */
.check-activity{
  background:var(--color-surface); border:1px solid var(--color-border);
  border-radius:var(--radius-md); padding:1.4em; margin-bottom:1.5em;
}
.check-activity__options{
  border:none; padding:0; margin:1em 0; display:flex; flex-direction:column; gap:0.6em;
}
.check-option{
  display:flex; align-items:center; gap:0.7em; font-weight:600; color:var(--color-ink);
  cursor:pointer; padding:0.5em 0.8em; border:1.5px solid var(--color-border); border-radius:var(--radius-sm);
}
.check-option:hover{ border-color:var(--color-primary); }
.check-option input{ width:1.2em; height:1.2em; accent-color:var(--color-primary); }
.feedback-result{ margin-top:0.8em; font-weight:700; min-height:1.5em; }
.feedback-result.is-ok{ color:var(--color-ok); }
.feedback-result.is-error{ color:var(--color-error); }

.check-activity--done{
  border-color: var(--color-ok);
  background: var(--color-ok-bg);
}
.check-option:has(input:disabled){
  opacity: 0.6;
  cursor: not-allowed;
}

.applet-frame--tall{
  padding-bottom: 0;
  aspect-ratio: 1422 / 666;
}

.module-media.module-media--stacked{
  grid-template-columns: 1fr;
}

/* Encabezado resaltado (usado en "Actividades de práctica" y donde se
   quiera dar énfasis extra), con sombreado en capas y una barra
   degradada rosa→dorado debajo, siguiendo la paleta del sitio. */
.section-heading--highlight{
  display: inline-block;
  position: relative;
  color: var(--color-plum-dark);
  text-shadow:
    2px 2px 0 var(--color-gold-light),
    4px 4px 6px rgba(90, 31, 83, 0.25);
  margin-bottom: 0.9em;
}
.section-heading--highlight::after{
  content: "";
  display: block;
  height: 4px;
  width: 72px;
  margin-top: 0.35em;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-gold));
}
body.high-contrast .section-heading--highlight{
  text-shadow: none;
  color: var(--color-ink);
}

.check-activity p{
  max-width: none;
}