feat(header): progreso de lectura y compactado al bajar

components/layout/Header.tsx

@@ -1,19 +1,41 @@
+'use client';
+
+import { useState } from 'react';
+import { useScroll, useMotionValueEvent } from 'framer-motion';
 import { Wordmark } from '@/components/primitives/Wordmark';
 import { CTA } from '@/components/primitives/CTA';
 import { Container } from '@/components/primitives/Container';
+import { ProgresoLectura } from '@/components/primitives/ProgresoLectura';
 import { header } from '@/lib/content';
 
+// The header tightens once the reader leaves the hero: less chrome, more page.
+// Client component because the compaction needs scroll state on the <header>
+// itself; there is no server-rendered data here to lose.
 export function Header() {
+  const [compacto, setCompacto] = useState(false);
+  const { scrollY } = useScroll();
+
+  useMotionValueEvent(scrollY, 'change', (y) => {
+    // Hysteresis: compact past 120px, expand back below 60px, so a header
+    // sitting exactly on the threshold doesn't flicker.
+    setCompacto((actual) => (actual ? y > 60 : y > 120));
+  });
+
   return (
-    <header className="sticky top-0 z-50 border-b border-azul-profundo/10 bg-white/80 backdrop-blur">
-      <Container className="flex items-center justify-between py-3">
-        <a href="#top" aria-label="creeer — inicio">
-          <Wordmark size="md" />
+    <header
+      className={`sticky top-0 z-50 relative border-b border-azul-profundo/10 bg-white/80 backdrop-blur transition-[padding] duration-300 motion-reduce:transition-none ${
+        compacto ? 'py-0' : 'py-3'
+      }`}
+    >
+      <Container className="flex items-center justify-between">
+        <a href="#top" aria-label="creeer — inicio" className="block transition-transform duration-300 origin-left motion-reduce:transition-none">
+          <Wordmark size={compacto ? 'sm' : 'md'} />
         </a>
         <nav aria-label="Principal">
           <CTA href="#contacto" label={header.cta} variant="light" />
         </nav>
       </Container>
+      <ProgresoLectura />
     </header>
   );
 }