/* ==========================================================================
   Portada · Intro tipográfica + construcción del título final
   Va con js/hero-intro.js. Se carga después de foro.css y solo en la portada.
   Solo usa tipografías y colores del sitio (foro.css): Foro Display (--display),
   Barlow (--sans), el azul fuerte del ∞ (--b-strong), el celeste de las
   etiquetas de las bandas oscuras (.band--dark .band__eyebrow) y --f-neon.
   ========================================================================== */

.film {
  --i-azul: var(--b-strong, #1f56e8);  /* azul fuerte del ∞ */
  --i-celeste: #8fe3ff;                /* etiqueta de .band--dark */
  --i-verde: var(--f-neon, #4ee37f);
}

/* ---------- Mientras corre la intro, el corto y el respaldo esperan ocultos ---------- */
.film.is-intro :is(.film__canvas, .film__poster, .film__copy, .film__bar) {
  opacity: 0 !important;
  visibility: hidden !important;
}
.film.intro-done .film__canvas {
  animation: iEntraCorto 1.2s var(--ease-out) both;
}

/* ==========================================================================
   ACTO 1 · INTRO
   ========================================================================== */
.intro {
  position: absolute;
  z-index: 6;
  inset: 0;
  display: grid;
  place-items: center;
  padding: calc(var(--hdr-full, 104px) * 0.6) var(--gutter, 24px) 2rem;
  color: var(--f-ink, #f1f4ff);
  text-align: center;
  pointer-events: none;
  transition: opacity 0.9s var(--ease-out);
}
.film.intro-done .intro {
  opacity: 0;
}

.intro__slide {
  grid-area: 1 / 1;
  visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: min(94vw, 1150px);
  perspective: 900px;
}
.intro__slide.is-in {
  visibility: visible;
}

.intro__row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: baseline;
  column-gap: 0.3em;
  margin: 0;
  line-height: 0.95;
}

/* Cada bloque sale de una máscara */
.intro .w {
  display: inline-block;
  overflow: hidden;
  padding: 0.08em 0.04em 0.28em;  /* aire para los descendentes (g, p, y) */
  margin-bottom: -0.12em;
  line-height: 1;
}
.intro .w > span {
  display: inline-block;
  padding-bottom: 0.14em;  /* el degradado de texto cubre también la cola de la g */
  transform: translateY(115%) rotate(7deg);
  transform-origin: 0 100%;
}
.intro .is-in .w > span {
  animation: iSube 0.95s cubic-bezier(0.16, 1.25, 0.3, 1) both;
  animation-delay: calc(var(--i, 0) * 0.16s);
}

/* ---------- Escala de tamaños: el contraste marca el ritmo ---------- */
/* Palabras pequeñas: mismo estilo que las etiquetas de las bandas oscuras */
.intro .w--sm {
  font: 600 clamp(0.95rem, 1.7vw, 1.35rem) / 1 var(--sans);
  text-transform: uppercase;
  letter-spacing: 0.24em;
  color: var(--i-celeste);
}
.intro .w--md {
  font: 600 clamp(1.9rem, 4.6vw, 3.7rem) / 1 var(--display);
}
.intro .w--lg {
  font: 700 clamp(2.5rem, 7vw, 5.6rem) / 1 var(--display);
  letter-spacing: -0.01em;
}
.intro .w--xl {
  font: 700 clamp(3.6rem, 13vw, 10.5rem) / 0.9 var(--display);
  letter-spacing: -0.03em;
}
.intro .w--azul {
  color: var(--i-azul);
}

/* ---------- XL: letra por letra, cae y rebota ---------- */
.intro .w[data-split] {
  overflow: visible;
}
.intro .wd {
  display: inline-block;
  white-space: nowrap;
}
.intro .ch {
  display: inline-block;
  opacity: 0;
}
.intro .is-in .ch {
  animation: iCae 0.9s cubic-bezier(0.2, 1.55, 0.35, 1) both;
  animation-delay: calc(var(--i, 0) * 0.16s + var(--n) * 0.045s);
}

/* ---------- Número gigante: golpe + contador ---------- */
.intro .w--num {
  overflow: visible;
  font: 700 clamp(6.5rem, 26vw, 18rem) / 0.85 var(--display);
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
}
.intro .w--num > span {
  transform: none;
  background: linear-gradient(180deg, #fff 15%, var(--i-azul) 65%, var(--i-verde));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.intro .is-in .w--num > span {
  animation: iGolpe 1.1s cubic-bezier(0.2, 1.3, 0.3, 1) both;
  animation-delay: calc(var(--i) * 0.16s);
}

/* ---------- FCA UNAM: el espaciado se abre ---------- */
.intro .w--track {
  overflow: visible;
  margin-top: 0.7em;
  font: 600 clamp(1rem, 2vw, 1.35rem) / 1 var(--sans);
  color: var(--i-verde);
}
.intro .w--track > span {
  transform: none;
  letter-spacing: 0.55em;
  margin-right: -0.55em; /* compensa el espacio final para centrar */
}
.intro .is-in .w--track > span {
  animation: iAbre 1.2s cubic-bezier(0.2, 0.8, 0.2, 1) both;
  animation-delay: calc(var(--i) * 0.16s);
}

/* ---------- "estrategias.": se tiñe de azul a verde ---------- */
.intro .w--acento > span {
  background: linear-gradient(90deg, #fff 0 38%, var(--i-azul) 58%, var(--i-verde) 75% 100%);
  background-size: 260% 100%;
  background-position: 0 0;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.intro .is-in .w--acento > span {
  animation:
    iSube 0.95s cubic-bezier(0.16, 1.25, 0.3, 1) both,
    iTinta 1.3s ease-in-out both;
  animation-delay:
    calc(var(--i) * 0.16s),
    calc(var(--i) * 0.16s + 0.7s);
}

/* ---------- Salidas ---------- */
.intro__slide.is-out {
  animation: iSale 0.7s cubic-bezier(0.7, 0, 0.84, 0) forwards;
}
.intro__slide--num.is-out {
  animation-name: iSaleArriba;
}

/* ---------- Botón saltar ---------- */
.intro__skip {
  position: absolute;
  z-index: 7;
  right: var(--gutter, 24px);
  bottom: clamp(20px, 4vh, 36px);
  font: 500 14px/1 var(--sans);
  color: var(--f-ink, #fff);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--f-line, rgba(160, 180, 255, 0.2));
  border-radius: 999px;
  padding: 0.7em 1.2em;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  cursor: pointer;
  transition: background 0.2s;
}
.intro__skip[hidden] {
  display: none;
}
.intro__skip:focus-visible {
  outline: 2px solid var(--i-verde);
  outline-offset: 3px;
}
@media (hover: hover) {
  .intro__skip:hover {
    background: rgba(255, 255, 255, 0.16);
  }
}

/* ==========================================================================
   ACTO 3 · CONSTRUCCIÓN DEL TÍTULO FINAL
   foro.css ya revela .film__copy y la franja inferior al llegar data-beat="title".
   Aquí se reemplaza la entrada del título, el subtítulo y los botones por una
   construcción animada; la franja inferior conserva su transición original.
   ========================================================================== */
.film.has-build:not(.is-built) :is(.film__title, .film__tag, .film__actions > *) {
  opacity: 0;
}
/* Las piezas que animamos no usan la transición de foro.css (evita doble efecto) */
.film.has-build .film__copy > :is(.film__title, .film__tag) {
  translate: none !important;
  filter: none !important;
}
.film__title {
  perspective: 900px;
}
.film__title .wd {
  display: inline-block;
  white-space: nowrap;
}
.film__title .ch {
  display: inline-block;
}

/* "Foro de Vinculación": letras que caen con rebote */
.film.is-built .film__title > span .ch {
  animation: fCae 0.85s cubic-bezier(0.2, 1.55, 0.35, 1) backwards;
  animation-delay: calc(var(--n) * 0.035s);
}
/* "y Emprendimiento": palabras que se voltean en 3D */
.film.is-built .film__title em .wd {
  transform-origin: 50% 100%;
  animation: fVoltea 1s cubic-bezier(0.2, 1.35, 0.4, 1) backwards;
  animation-delay: calc(0.75s + var(--w) * 0.18s);
}
/* Subtítulo: el espaciado se cierra */
.film.is-built .film__tag {
  animation: fAbre 1.1s cubic-bezier(0.2, 0.8, 0.2, 1) 1.2s backwards;
}
.film.is-built .film__tag b {
  display: inline-block;
  animation: fPop 0.6s cubic-bezier(0.3, 1.8, 0.5, 1) 1.85s backwards;
}
/* Botones: saltan uno tras otro */
.film.is-built .film__actions > * {
  animation: fBoton 0.75s cubic-bezier(0.3, 1.6, 0.5, 1) backwards;
}
.film.is-built .film__actions > :nth-child(1) {
  animation-delay: 1.7s;
}
.film.is-built .film__actions > :nth-child(2) {
  animation-delay: 1.85s;
}

/* ==========================================================================
   KEYFRAMES
   ========================================================================== */
@keyframes iSube {
  to { transform: translateY(0) rotate(0); }
}
@keyframes iCae {
  from { opacity: 0; transform: translateY(-0.7em) scale(1.8) rotate(-12deg); filter: blur(10px); }
  to { opacity: 1; transform: none; filter: blur(0); }
}
@keyframes iGolpe {
  from { opacity: 0; transform: scale(2.6); filter: blur(16px); }
  to { opacity: 1; transform: none; filter: blur(0); }
}
@keyframes iAbre {
  from { opacity: 0; letter-spacing: -0.4em; filter: blur(8px); }
  to { opacity: 1; letter-spacing: 0.55em; filter: blur(0); }
}
@keyframes iTinta {
  to { background-position: 100% 0; }
}
@keyframes iSale {
  to { opacity: 0; transform: scale(1.18); filter: blur(14px); }
}
@keyframes iSaleArriba {
  to { opacity: 0; transform: translateY(-25%) scale(0.85); filter: blur(10px); }
}
@keyframes iEntraCorto {
  from { opacity: 0; }
}
@keyframes fCae {
  from { opacity: 0; transform: translateY(-0.9em) rotate(-10deg) scale(1.4); filter: blur(8px); }
}
@keyframes fVoltea {
  from { opacity: 0; transform: rotateX(-100deg) translateY(0.3em); filter: blur(6px); }
}
@keyframes fAbre {
  from { opacity: 0; letter-spacing: -0.25em; filter: blur(6px); }
}
@keyframes fPop {
  from { opacity: 0; transform: scale(0.4); }
}
@keyframes fBoton {
  from { opacity: 0; transform: translateY(1.2em) scale(0.85); }
}

/* ==========================================================================
   Accesibilidad: sin movimiento, composición final directa
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  .intro,
  .intro__skip {
    display: none !important;
  }
  .film :is(.film__title, .film__tag, .film__actions > *, .film__title .ch, .film__title .wd, .film__tag b) {
    opacity: 1 !important;
    animation: none !important;
  }
}