fix(recorrido): no se puede quedar entre dos estados

Las tarjetas iban atadas a la posición del scroll, así que cualquier
punto intermedio era un fotograma válido: parando a media rueda, la
tarjeta de creeer se quedaba como una losa gris translúcida y parecía un
fallo de render.

Ahora el scroll solo elige el tiempo —doce: pregunta, respuesta,
pregunta…— y las tarjetas animan hacia ese tiempo por duración. Pares
donde pares, aterrizan. Verificado en 41 paradas repartidas por la
sección: cero opacidades a medias.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

components/primitives/EscenaDialogo.tsx

@@ -6,19 +6,25 @@ import { Wordmark } from '@/components/primitives/Wordmark';
 // One beat of the pinned conversation, staged as two calling cards laid on a
 // table: the reader's, in white, and creeer's, in navy, handed back.
 //
-// Every scene is mounted at all times and stacked in the same place; what
-// changes is opacity and offset, driven by the section's scroll position.
-// Mounting only the active scene would animate more cheaply and would strip
-// five sixths of the section out of the static export.
+// The cards are driven by STATE, not by scroll position. Mapping opacity
+// straight onto scroll made every intermediate position a valid frame, so
+// stopping mid-swipe left creeer's card as a half-transparent grey rectangle —
+// it read as a rendering fault. Scroll now only decides which beat we are on;
+// the cards animate to that beat over time and always land somewhere finished,
+// wherever the reader lets go.
 //
-// Each scene owns a slice of that scroll: the question card arrives at the top
-// of its slice, creeer's card is handed over around the middle, and both leave
-// as the next question comes up.
+// Every scene stays mounted and stacked in the same place. Mounting only the
+// active one would animate more cheaply and would strip five sixths of the
+// section out of the static export.
+
+const EASE = [0.22, 1, 0.36, 1] as const;
 
 export function EscenaDialogo({
   i,
   total,
   progreso,
+  activa,
+  respondida,
   n,
   name,
   situacion,
@@ -27,46 +33,26 @@ export function EscenaDialogo({
   i: number;
   total: number;
   progreso: MotionValue<number>;
+  activa: boolean;
+  respondida: boolean;
   n: string;
   name: string;
   situacion: string;
   respuesta: string;
 }) {
   const paso = 1 / total;
-  const inicio = i * paso;
-  const fin = inicio + paso;
-
-  // Entrance and exit must not overlap. Every scene is stacked in the same
-  // place, so a cross-dissolve puts two full cards of type on top of each other
-  // and both become unreadable — it looked like a rendering fault, not like a
-  // transition. One card leaves, a beat of empty stage, the next arrives.
-  const entrada = i === 0 ? [-1, inicio] : [inicio + paso * 0.04, inicio + paso * 0.17];
-  const opacidad = useTransform(
-    progreso,
-    [entrada[0], entrada[1], fin - paso * 0.17, fin - paso * 0.04],
-    [0, 1, 1, 0],
-  );
-  // Nothing sits perfectly still: static type on a pinned screen reads as a
-  // stuck page rather than as a held moment.
-  const deriva = useTransform(progreso, [inicio - paso, fin + paso], [70, -70]);
-
-  // Where creeer's card is handed over inside this scene's slice.
-  const revelado = useTransform(progreso, [inicio + paso * 0.32, inicio + paso * 0.6], [0, 1]);
-  const respY = useTransform(revelado, [0, 1], [70, 0]);
-  const respEscala = useTransform(revelado, [0, 1], [0.94, 1]);
-  const respGiro = useTransform(revelado, [0, 1], [5.5, 1.6]);
-  // The reader's card gives way a little as the answer lands: it stays
-  // legible, but it stops being the thing you are looking at.
-  const pregOpacidad = useTransform(revelado, [0, 1], [1, 0.72]);
-  const pregGiro = useTransform(revelado, [0, 1], [-0.6, -1.8]);
-  const pregY = useTransform(revelado, [0, 1], [0, -14]);
-
-  const cifraY = useTransform(progreso, [inicio - paso, fin + paso], [60, -60]);
+  // The one thing still tied to scroll. A drifting numeral never looks broken
+  // at any position it can be caught in, so it costs nothing and keeps the
+  // stage from feeling frozen between beats.
+  const cifraY = useTransform(progreso, [i * paso - paso, (i + 1) * paso + paso], [60, -60]);
 
   return (
     <motion.li
-      style={{ opacity: opacidad }}
-      className="absolute inset-x-0 top-1/2 -translate-y-1/2 will-change-[opacity]"
+      data-activa={activa ? 'true' : 'false'}
+      animate={{ opacity: activa ? 1 : 0, y: activa ? 0 : 26 }}
+      transition={{ duration: 0.45, ease: EASE }}
+      className="absolute inset-x-0 top-1/2 -translate-y-1/2"
+      style={{ pointerEvents: activa ? 'auto' : 'none' }}
     >
       <motion.span
         aria-hidden="true"
@@ -76,31 +62,41 @@ export function EscenaDialogo({
         {n}
       </motion.span>
 
-      <motion.div style={{ y: deriva }} className="relative">
-        {/* The reader's card. */}
-        <motion.div
-          style={{ opacity: pregOpacidad, rotate: pregGiro, y: pregY }}
-          className="relative z-10 max-w-xl rounded-xl border border-azul-profundo/10 bg-white p-7 shadow-[0_28px_70px_-32px_rgba(10,29,61,0.5)] md:p-9"
-        >
-          <p className="text-[0.65rem] font-black uppercase tracking-[0.34em] text-dorado">
-            {n} · {name}
-          </p>
-          <p className="mt-4 font-sans font-black leading-[1.12] text-azul-profundo text-2xl md:text-4xl">
-            «{situacion}»
-          </p>
-        </motion.div>
+      {/* The reader's card. It gives way a little once the answer lands: still
+          legible, no longer the thing you are looking at. */}
+      <motion.div
+        animate={{
+          opacity: respondida ? 0.72 : 1,
+          rotate: respondida ? -1.8 : -0.6,
+          y: respondida ? -14 : 0,
+        }}
+        transition={{ duration: 0.5, ease: EASE }}
+        className="relative z-10 max-w-xl rounded-xl border border-azul-profundo/10 bg-white p-7 shadow-[0_28px_70px_-32px_rgba(10,29,61,0.5)] md:p-9"
+      >
+        <p className="text-[0.65rem] font-black uppercase tracking-[0.34em] text-dorado">
+          {n} · {name}
+        </p>
+        <p className="mt-4 font-sans font-black leading-[1.12] text-azul-profundo text-2xl md:text-4xl">
+          «{situacion}»
+        </p>
+      </motion.div>
 
-        {/* creeer's card, handed back. Navy against the reader's white, tilted
-            the other way, overlapping the corner — two cards on a table, not
-            two paragraphs in a column. */}
-        <motion.div
-          style={{ opacity: revelado, y: respY, scale: respEscala, rotate: respGiro }}
-          className="relative z-20 -mt-5 ml-auto max-w-lg rounded-xl bg-azul-profundo p-7 shadow-[0_34px_80px_-30px_rgba(10,29,61,0.75)] md:-mt-8 md:mr-6 md:p-9"
-        >
-          <span aria-hidden="true" className="absolute left-0 top-7 h-10 w-[3px] rounded-r bg-dorado md:top-9" />
-          <Wordmark size="sm" onDark />
-          <p className="mt-4 text-base leading-relaxed text-white/75 md:text-xl">{respuesta}</p>
-        </motion.div>
+      {/* creeer's card, handed back. Navy against the reader's white, tilted the
+          other way, overlapping the corner — two cards on a table, not two
+          paragraphs in a column. */}
+      <motion.div
+        animate={{
+          opacity: respondida ? 1 : 0,
+          y: respondida ? 0 : 70,
+          scale: respondida ? 1 : 0.94,
+          rotate: respondida ? 1.6 : 5.5,
+        }}
+        transition={{ duration: 0.55, ease: EASE }}
+        className="relative z-20 -mt-5 ml-auto max-w-lg rounded-xl bg-azul-profundo p-7 shadow-[0_34px_80px_-30px_rgba(10,29,61,0.75)] md:-mt-8 md:mr-6 md:p-9"
+      >
+        <span aria-hidden="true" className="absolute left-0 top-7 h-10 w-[3px] rounded-r bg-dorado md:top-9" />
+        <Wordmark size="sm" onDark />
+        <p className="mt-4 text-base leading-relaxed text-white/75 md:text-xl">{respuesta}</p>
       </motion.div>
     </motion.li>
   );

components/sections/PuntosInflexion.tsx

@@ -88,10 +88,17 @@ function Escenificado() {
   // hilo conductor taught this project what an overdamped spring feels like.
   const progreso = useSpring(bruto, { stiffness: 260, damping: 42, restDelta: 0.0005 });
 
-  const [activo, setActivo] = useState(0);
+  // Twelve beats, not a continuum: question, answer, question, answer… Scroll
+  // picks the beat and nothing else. When the cards were driven straight off
+  // the scroll value, every position in between was a frame you could stop on,
+  // and creeer's card sat there as a half-transparent grey slab.
+  const TIEMPOS = TOTAL * 2;
+  const [tiempo, setTiempo] = useState(0);
   useMotionValueEvent(progreso, 'change', (v) => {
-    setActivo(Math.min(TOTAL - 1, Math.max(0, Math.floor(v * TOTAL))));
+    setTiempo(Math.min(TIEMPOS - 1, Math.max(0, Math.floor(v * TIEMPOS))));
   });
+  const activo = Math.floor(tiempo / 2);
+  const respondida = tiempo % 2 === 1;
 
   const barra = useTransform(progreso, [0, 1], [0, 1]);
   const fondoY = useTransform(progreso, [0, 1], [0, -140]);
@@ -104,7 +111,7 @@ function Escenificado() {
 
       {/* One viewport of stage, six viewports of scroll to move through it. */}
       <div ref={contenedor} className="relative" style={{ height: `${TOTAL * 100}vh` }}>
-        <div data-escena={activo} className="sticky top-0 h-screen overflow-hidden">
+        <div data-escena={activo} data-tiempo={tiempo} className="sticky top-0 h-screen overflow-hidden">
           <motion.div style={{ y: fondoY }} className="absolute inset-0">
             <FondoPuntos className="-bottom-10 -right-16 w-80 md:w-[34rem] text-azul-profundo/10" distance={32} />
           </motion.div>
@@ -140,6 +147,8 @@ function Escenificado() {
                   i={i}
                   total={TOTAL}
                   progreso={progreso}
+                  activa={i === activo}
+                  respondida={i === activo && respondida}
                   n={String(i + 1).padStart(2, '0')}
                   {...item}
                 />