/* ==========================================================================
   UNIVERSIDAD INTERNACIONAL VIDA · MODELO 2: INMERSIVO 3D
   SimCodec · Diseño Corporativo, Sobrio y Accesible
   ========================================================================== */

/* FUENTES TIPOGRÁFICAS LOCALES (WOFF2) */
@font-face {
  font-family: 'Inter';
  src: url('fonts/inter-400-normal.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('fonts/inter-500-normal.woff2') format('woff2');
  font-weight: 500;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('fonts/inter-600-normal.woff2') format('woff2');
  font-weight: 600;
  font-display: swap;
}
@font-face {
  font-family: 'Inter Tight';
  src: url('fonts/inter-tight-800-normal.woff2') format('woff2');
  font-weight: 800;
  font-display: swap;
}
@font-face {
  font-family: 'Instrument Serif';
  src: url('fonts/instrument-serif-400-normal.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'IBM Plex Mono';
  src: url('fonts/ibm-plex-mono-latin-400-normal.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}

/* VARIABLES DE SISTEMA */
:root {
  --papel: #F5F3EE;
  --papel-puro: #FFFFFF;
  --tinta: #14161C;
  --tinta-suave: #4A4F5A;
  --azul: #1F4E79;
  --azul-noche: #0E2238;
  --dorado: #B07A1E;
  --dorado-brillante: #D97706;
  --dorado-luz: #F59E0B;
  --linea: rgba(20, 22, 28, 0.12);
  --linea-fuerte: rgba(20, 22, 28, 0.22);
  --linea-dorada: rgba(176, 122, 30, 0.35);

  --aviso-h: 38px;
  --header-h: 76px;
  --pad: clamp(18px, 4vw, 56px);

  --sans: 'Inter', system-ui, -apple-system, sans-serif;
  --display: 'Inter Tight', 'Inter', sans-serif;
  --serif: 'Instrument Serif', Georgia, serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
}

/* RESET Y BASE */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  background: var(--papel);
  color: var(--tinta);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  background: var(--papel);
  color: var(--tinta);
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

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

/* ACCESIBILIDAD */
.saltar {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 1000;
  background: var(--azul-noche);
  color: #FFFFFF;
  padding: 10px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 4px;
  transition: top 0.2s ease;
}
.saltar:focus {
  top: 16px;
}

/* CONTENEDOR */
.contenedor {
  width: min(1280px, 100% - var(--pad) * 2);
  margin-inline: auto;
}

/* AVISO DE DEMOSTRACIÓN COMPACTO (UNA SOLA LÍNEA EN ESCRITORIO) */
.aviso {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: var(--azul-noche);
  color: #E2E8F0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.8125rem;
  padding: 7px var(--pad);
}

.aviso-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: min(1360px, 100%);
  margin-inline: auto;
}

.aviso-texto {
  margin: 0;
  white-space: nowrap;
  font-size: 0.8125rem;
  color: #E2E8F0;
}

.demo-bar-modelos {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.77rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.demo-bar-modelos__label {
  color: rgba(226, 232, 240, 0.75);
}

.demo-bar-modelos__enlace {
  color: #CBD5E1;
  padding: 2px 7px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.08);
  transition: all 0.2s ease;
}

.demo-bar-modelos__enlace:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #FFFFFF;
}

.demo-bar-modelos__enlace.actual {
  background: var(--dorado);
  color: #FFFFFF;
  font-weight: 600;
}

/* ENCABEZADO PRINCIPAL (SITE HEADER) */
.site-header {
  position: fixed;
  top: var(--aviso-h);
  left: 0;
  right: 0;
  z-index: 180;
  background: rgba(245, 243, 238, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--linea);
  transition: background 0.3s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px var(--pad);
  width: min(1360px, 100%);
  margin-inline: auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  min-width: 0;
}

.logo-badge {
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.05em;
  background: var(--azul-noche);
  color: #FFFFFF;
  padding: 6px 10px;
  border-radius: 3px;
  border-left: 3px solid var(--dorado);
}

.logo-info {
  display: flex;
  flex-direction: column;
}

.logo-nombre {
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.05rem;
  line-height: 1.15;
  color: var(--tinta);
  letter-spacing: -0.02em;
}

.logo-lugar {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--azul);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* NAVEGACIÓN */
.nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--tinta-suave);
  padding: 6px 0;
  position: relative;
  transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.actual {
  color: var(--azul-noche);
}

.nav-link.actual::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--dorado);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 0.875rem;
  font-weight: 600;
  background: var(--azul);
  color: #FFFFFF;
  border-radius: 4px;
  transition: background 0.2s ease, transform 0.2s ease;
}

.header-cta:hover {
  background: var(--azul-noche);
  transform: translateY(-1px);
}

/* BOTÓN MENÚ MÓVIL */
.hamburguesa {
  display: none;
  background: none;
  border: 1px solid var(--linea);
  border-radius: 4px;
  padding: 10px;
  cursor: pointer;
  width: 44px;
  height: 44px;
  position: relative;
}

.hamburguesa span {
  position: absolute;
  left: 10px;
  right: 10px;
  height: 2px;
  background: var(--tinta);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.hamburguesa span:first-child { top: 16px; }
.hamburguesa span:last-child { top: 26px; }

.menu-abierto .hamburguesa span:first-child {
  transform: translateY(5px) rotate(45deg);
}
.menu-abierto .hamburguesa span:last-child {
  transform: translateY(-5px) rotate(-45deg);
}

/* CONTENEDOR 3D (CANVAS) */
.canvas-3d-wrap {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1;
  pointer-events: none;
  overflow: hidden;
}

#webgl-canvas {
  width: 100%;
  height: 100%;
  display: block;
  opacity: 0;
  transition: opacity 0.8s ease-out;
}

#webgl-canvas.cargado {
  opacity: 1;
}

/* RESPALDO ESTÁTICO SIN WEBGL */
.webgl-fallback {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 65% 45%, rgba(245, 158, 11, 0.08) 0%, rgba(31, 78, 121, 0.05) 50%, var(--papel) 80%);
  align-items: center;
  justify-content: flex-end;
  padding-right: 8vw;
}

.fallback-graphic {
  width: min(480px, 60vw);
  opacity: 0.85;
}

/* CAPA DE CONTENIDO (MAIN) */
main {
  position: relative;
  z-index: 10;
}

/* HERO SECTION */
.hero {
  min-height: 100svh;
  padding: calc(var(--aviso-h) + var(--header-h) + 20px) var(--pad) 40px;
  display: flex;
  align-items: center;
  position: relative;
  width: min(1380px, 100%);
  margin-inline: auto;
}

.hero-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 24px;
  pointer-events: none;
}

/* El texto del hero a la izquierda sin tarjeta pesada */
.hero-content {
  max-width: 480px;
  width: 100%;
  padding: 0;
  background: transparent;
  border: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  pointer-events: auto;
  z-index: 10;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--azul);
  margin-bottom: 16px;
}

.hero-tag::before {
  content: '';
  width: 7px;
  height: 7px;
  background: var(--dorado);
  border-radius: 50%;
}

.hero-title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(3.0rem, 5.8vw, 5.4rem);
  line-height: 0.98;
  letter-spacing: -0.015em;
  color: var(--azul-noche);
  margin: 0 0 20px;
}

.hero-lead {
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  line-height: 1.5;
  color: var(--tinta-suave);
  margin: 0 0 28px;
  max-width: 40ch;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 13px 24px;
  border-radius: 4px;
  transition: all 0.25s ease;
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--azul);
  color: #FFFFFF;
}

.btn-primary:hover {
  background: var(--azul-noche);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(14, 34, 56, 0.18);
}

.btn-secundary {
  background: var(--papel-puro);
  color: var(--tinta);
  border: 1px solid var(--linea-fuerte);
}

.btn-secundary:hover {
  background: #EAE6DD;
  color: var(--azul-noche);
  border-color: var(--azul);
}

/* LISTA LATERAL ESTILO ACTIVE THEORY (COMPACTA Y PEGADA AL BORDE DERECHO) */
.active-theory-dock {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: rgba(14, 34, 56, 0.92);
  padding: 14px 14px;
  border-radius: 6px;
  border: 1px solid var(--linea-dorada);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 12px 28px rgba(14, 34, 56, 0.25);
  width: 220px;
  flex-shrink: 0;
  pointer-events: auto;
  align-self: center;
  z-index: 10;
}

.active-theory-dock__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  padding-bottom: 8px;
  margin-bottom: 2px;
}

.dock-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #94A3B8;
}

.dock-indicator {
  width: 6px;
  height: 6px;
  background: #10B981;
  border-radius: 50%;
  box-shadow: 0 0 8px #10B981;
}

.active-theory-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.active-theory-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  color: #E2E8F0;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.active-theory-item:hover,
.active-theory-item.activo {
  background: rgba(176, 122, 30, 0.25);
  border-color: var(--dorado-luz);
  color: #FFFFFF;
  transform: translateX(3px);
}

.active-theory-item__arrow {
  color: #94A3B8;
  transition: transform 0.2s ease;
}

.active-theory-item:hover .active-theory-item__arrow,
.active-theory-item.activo .active-theory-item__arrow {
  transform: translateX(2px);
  color: var(--dorado-luz);
}

.active-theory-item__title {
  font-weight: 500;
  letter-spacing: 0.04em;
}

/* SECCIONES ESTÁNDAR */
.seccion {
  padding: 100px 0;
  position: relative;
}

.seccion-oscura {
  background: rgba(14, 34, 56, 0.92);
  color: #F8FAFC;
  border-top: 1px solid var(--linea-dorada);
  border-bottom: 1px solid var(--linea-dorada);
}

.seccion-header {
  margin-bottom: 48px;
}

.seccion-header.centrado {
  text-align: center;
  max-width: 760px;
  margin-inline: auto;
}

.seccion-tag {
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--azul);
  margin-bottom: 12px;
}

.seccion-oscura .seccion-tag {
  color: var(--dorado-luz);
}

.seccion-titulo {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.4rem, 5.2vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
  color: var(--azul-noche);
}

.seccion-oscura .seccion-titulo {
  color: #FFFFFF;
}

.seccion-subtitulo {
  font-size: 1.15rem;
  color: var(--tinta-suave);
  max-width: 65ch;
  margin: 0;
}

.seccion-oscura .seccion-subtitulo {
  color: #CBD5E1;
}

/* TARJETAS DE OFERTA ACADÉMICA */
.grid-oferta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card-area {
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--linea);
  border-radius: 6px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: all 0.3s ease;
}

.card-area:hover {
  transform: translateY(-4px);
  border-color: var(--dorado);
  box-shadow: 0 12px 28px rgba(14, 34, 56, 0.08);
}

.card-area__num {
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--dorado);
  margin-bottom: 16px;
}

.card-area__titulo {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 2.1rem;
  letter-spacing: -0.01em;
  color: var(--azul-noche);
  margin: 0 0 12px;
}

.card-area__desc {
  font-size: 0.95rem;
  color: var(--tinta-suave);
  line-height: 1.5;
  margin: 0 0 24px;
}

.card-area__link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--azul);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.card-area__link:hover {
  color: var(--azul-noche);
}

/* PROCESO DE ADMISIÓN */
.grid-pasos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.card-paso {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  padding: 32px;
  position: relative;
}

.card-paso__num {
  font-family: var(--mono);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--dorado-luz);
  line-height: 1;
  margin-bottom: 20px;
}

.card-paso__titulo {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.85rem;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
  color: #FFFFFF;
}

.card-paso__desc {
  font-size: 0.95rem;
  color: #CBD5E1;
  line-height: 1.5;
  margin: 0;
}

/* FORMULARIO DE DEMOSTRACIÓN */
.form-wrap {
  max-width: 680px;
  margin-inline: auto;
  background: var(--papel-puro);
  border: 1px solid var(--linea);
  border-radius: 8px;
  padding: clamp(24px, 4vw, 44px);
  box-shadow: 0 16px 36px rgba(14, 34, 56, 0.06);
}

.form-nota-demo {
  background: #FEF3C7;
  color: #92400E;
  border-left: 4px solid #D97706;
  padding: 10px 14px;
  font-size: 0.85rem;
  border-radius: 0 4px 4px 0;
  margin-bottom: 24px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group.completo {
  grid-column: 1 / -1;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--tinta);
}

.form-group input,
.form-group select,
.form-group textarea {
  font-family: var(--sans);
  font-size: 0.9375rem;
  padding: 11px 14px;
  border: 1px solid var(--linea-fuerte);
  border-radius: 4px;
  background: #FAF8F5;
  color: var(--tinta);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--azul);
  background: #FFFFFF;
  outline: none;
}

.form-feedback {
  display: none;
  padding: 14px 18px;
  margin-top: 20px;
  border-radius: 4px;
  font-size: 0.9rem;
  line-height: 1.4;
}

.form-feedback.exito {
  background: #DCFCE7;
  color: #166534;
  border: 1px solid #86EFAC;
}

/* PIE DE PÁGINA (FOOTER) */
.site-footer {
  background: var(--azul-noche);
  color: #CBD5E1;
  padding: 72px 0 36px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-col__brand {
  max-width: 440px;
}

.footer-logo-title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.8rem;
  letter-spacing: -0.01em;
  color: #FFFFFF;
  margin: 0 0 12px;
}

.footer-brand-desc {
  font-size: 0.9rem;
  line-height: 1.5;
  color: #94A3B8;
  margin: 0 0 20px;
}

.footer-col-title {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dorado-luz);
  margin: 0 0 16px;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.875rem;
  color: #CBD5E1;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 32px;
  font-size: 0.8125rem;
  flex-wrap: wrap;
  gap: 16px;
  color: #94A3B8;
}

.footer-models {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-family: var(--mono);
}

.footer-models a {
  color: #CBD5E1;
  padding: 4px 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 3px;
  transition: all 0.2s ease;
}

.footer-models a:hover {
  background: rgba(255, 255, 255, 0.16);
  color: #FFFFFF;
}

.footer-models a.actual {
  background: var(--dorado);
  color: #FFFFFF;
  font-weight: 600;
}

/* CORTINA DE TRANSICIÓN ENTRE PÁGINAS */
.curtain-branches {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 9999;
  pointer-events: none;
  visibility: hidden;
  opacity: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.curtain-branches.activo {
  visibility: visible;
  opacity: 1;
}

.curtain-branches.inactivo {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}

.curtain-branch {
  position: absolute;
  top: 0;
  width: 55vw;
  height: 100vh;
  background: var(--azul-noche);
  display: flex;
  align-items: center;
  justify-content: center;
  will-change: transform;
}

.curtain-branch--left {
  left: 0;
  border-right: 2px solid var(--dorado-luz);
}

.curtain-branch--right {
  right: 0;
  border-left: 2px solid var(--dorado-luz);
}

.curtain-branch-svg {
  width: 80%;
  height: 80%;
  opacity: 0.18;
}

.curtain-emblem {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  background: rgba(14, 34, 56, 0.95);
  border: 1px solid var(--dorado-luz);
  padding: 24px 36px;
  border-radius: 6px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.curtain-emblem__logo {
  font-family: var(--display);
  font-weight: 800;
  font-size: 2.2rem;
  letter-spacing: 0.08em;
  color: #FFFFFF;
}

.curtain-emblem__sub {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dorado-luz);
}

/* RESPONSIVE DESIGN */
@media (max-width: 1100px) {
  .hero-grid {
    flex-direction: column;
    align-items: flex-start;
    gap: 32px;
  }
  .active-theory-dock {
    align-self: flex-start;
    width: 100%;
    max-width: 340px;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 860px) {
  .aviso-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
  .aviso-texto {
    white-space: normal;
    font-size: 0.75rem;
    line-height: 1.35;
  }
  .demo-bar-modelos {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }
  .nav {
    display: none;
    position: fixed;
    top: calc(var(--aviso-h) + var(--header-h));
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--papel);
    flex-direction: column;
    padding: 32px var(--pad);
    gap: 20px;
    align-items: flex-start;
    border-top: 1px solid var(--linea);
    z-index: 175;
  }
  .menu-abierto .nav {
    display: flex;
  }
  .hamburguesa {
    display: block;
  }
  .header-cta {
    display: none;
  }
  .form-grid {
    grid-template-columns: 1fr;
  }
  #webgl-canvas.cargado {
    opacity: 0.55;
  }
}

@media (max-width: 480px) {
  :root {
    --pad: 16px;
  }
  #webgl-canvas.cargado {
    opacity: 0.42;
  }
  .aviso {
    font-size: 0.75rem;
    padding: 6px 12px;
  }
  .demo-bar-modelos {
    gap: 4px;
    font-size: 0.7rem;
  }
  .hero-content {
    padding: 20px 16px;
  }
  .hero-title {
    font-size: 2.4rem;
  }
  .btn {
    width: 100%;
    justify-content: center;
  }
}

/* REDUCED MOTION */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .curtain-branch {
    transition: none !important;
  }
}