feat(hilo): el conductor baja visible por el centro, tras el texto

components/primitives/HiloConductor.tsx

@@ -3,45 +3,28 @@
 import { motion, useScroll, useSpring } from 'framer-motion';
 import { usePrefersReducedMotion } from '@/lib/motion';
 
-// One continuous gold line running the height of the page, drawing itself as
-// the reader scrolls. It is the spine of the layout: it stitches the sections
-// together so the landing reads as a route rather than a stack of blocks.
+// The gold spine of the page: one continuous line down the vertical centre,
+// drawing itself as the reader scrolls. It is what turns ten sections into a
+// single route — *claridad · dirección · crecimiento* made visible, per the
+// Manual de Identidad Visual.
 //
-// Positioned `absolute`, never `fixed` — the thread belongs to the document
-// and scrolls with it. A fixed layer would read as an ornament stuck to the
-// window.
+// Centred, never in a side gutter: the brand's through-line belongs in the
+// middle, on every breakpoint. It sits ABOVE the section backgrounds (z-10)
+// but BELOW the text, which `Container` lifts to z-20 — so the thread reads
+// as a faint watermark spine behind the reading, never crossing it.
 //
-// Uses the page-level useScroll() with no target ref on purpose: no element
-// measuring, no "container has a static position" warnings, and one scroll
-// listener for the whole page.
-//
-// It lives in the empty margin band to the left of the centred
-// `max-w-content` (1152px) column, never over it — some sections are
-// `position: relative` for unrelated reasons and some are not, so an
-// absolutely-positioned overlay with no explicit stacking level paints
-// inconsistently: above the static sections, behind the relative ones. `z-30`
-// gives it its own stacking context that beats every section root regardless
-// of that accident, while staying under the sticky header's `z-50`.
-//
-// Hidden below `2xl` (1536px): that's the first breakpoint that guarantees a
-// safe margin outside the 1152px column — (1536 - 1152) / 2 = 192px per side,
-// comfortable room for the thread's own offset plus breathing space to the
-// viewport edge. Narrower viewports have no safe band, so the thread simply
-// doesn't render there rather than creeping over the text.
+// Page-level useScroll() with no target ref on purpose: no element measuring,
+// no "container has a static position" warnings, one listener for the page.
 
 const TRAZO =
-  'M50 0 C 20 140, 80 260, 50 400 C 20 540, 80 660, 50 800 C 20 940, 80 1060, 50 1200';
+  'M50 0 C 42 200, 58 400, 50 600 C 42 800, 58 1000, 50 1200';
 
 export function HiloConductor({ className = '' }: { className?: string }) {
   const reduced = usePrefersReducedMotion();
   const { scrollYProgress } = useScroll();
   const avance = useSpring(scrollYProgress, { stiffness: 90, damping: 30, restDelta: 0.001 });
 
-  // Percentage-based band geometry against the containing block, never
-  // `100vw` — `100vw` includes the scrollbar and would overshoot the real
-  // document width by ~15px on desktop. `inset-0` and the inner `mx-auto
-  // max-w-content` box both resolve against `<main>`'s own width instead.
-  const wrapper = `pointer-events-none absolute inset-0 z-30 hidden 2xl:block ${className}`;
+  const wrapper = `pointer-events-none absolute inset-0 z-10 ${className}`;
 
   // Plain <path> for reduced motion: motion.path applies dash scaffolding even
   // without initial/animate and would leave the thread invisible.
@@ -61,10 +44,10 @@ export function HiloConductor({ className = '' }: { className?: string }) {
   return (
     <div className={wrapper}>
       {/* Mirrors Container's own centring (`mx-auto max-w-content`) so the
-          band below is measured from the real column edge. */}
+          thread is measured from the real column edge and stays centred in it. */}
       <div className="relative mx-auto h-full w-full max-w-content">
         <svg
-          className="absolute inset-y-0 right-full mr-10 h-full w-14 text-dorado/25"
+          className="absolute inset-y-0 left-1/2 h-full w-14 -translate-x-1/2 text-dorado/25"
           viewBox="0 0 100 1200"
           preserveAspectRatio="none"
           aria-hidden="true"