feat: Mecanismo section (04, dark) — 3-step method

app/page.tsx

@@ -1,6 +1,7 @@
 import { Hero } from '@/components/sections/Hero';
 import { FraseAncla } from '@/components/sections/FraseAncla';
 import { ParaQuien } from '@/components/sections/ParaQuien';
+import { Mecanismo } from '@/components/sections/Mecanismo';
 
 export default function Home() {
   return (
@@ -8,6 +9,7 @@ export default function Home() {
       <Hero variant="editorial" />
       <FraseAncla />
       <ParaQuien />
+      <Mecanismo />
     </main>
   );
 }

components/sections/Mecanismo.tsx

@@ -0,0 +1,29 @@
+'use client';
+
+import { motion } from 'framer-motion';
+import { Container } from '@/components/primitives/Container';
+import { mecanismo } from '@/lib/content';
+import { fadeInUp, staggerContainer, viewportOnce } from '@/lib/motion';
+
+export function Mecanismo() {
+  return (
+    <section className="bg-bg-dark text-cream">
+      <Container className="py-24 md:py-32">
+        <motion.p variants={fadeInUp} initial="hidden" whileInView="visible" viewport={viewportOnce}
+          className="text-xs tracking-[0.3em] uppercase font-semibold text-gold-bright">{mecanismo.eyebrow}</motion.p>
+        <motion.h2 variants={fadeInUp} initial="hidden" whileInView="visible" viewport={viewportOnce}
+          className="mt-4 font-serif italic font-bold text-3xl md:text-5xl">{mecanismo.title}</motion.h2>
+        <motion.ol variants={staggerContainer} initial="hidden" whileInView="visible" viewport={viewportOnce}
+          className="mt-12 grid gap-10 md:grid-cols-3">
+          {mecanismo.steps.map((step) => (
+            <motion.li key={step.n} variants={fadeInUp} className="border-t border-gold-bright/30 pt-6">
+              <div className="font-serif italic font-black text-5xl md:text-6xl text-gold-bright leading-none">{step.n}</div>
+              <h3 className="mt-4 font-sans font-bold text-xl">{step.name}</h3>
+              <p className="mt-3 text-muted-dark leading-relaxed">{step.desc}</p>
+            </motion.li>
+          ))}
+        </motion.ol>
+      </Container>
+    </section>
+  );
+}

components/sections/__tests__/Mecanismo.test.tsx

@@ -0,0 +1,16 @@
+import { render, screen } from '@testing-library/react';
+import { describe, it, expect } from 'vitest';
+import { Mecanismo } from '../Mecanismo';
+
+describe('<Mecanismo />', () => {
+  it('renders the 3 steps in order', () => {
+    render(<Mecanismo />);
+    expect(screen.getByText('Inmersión')).toBeInTheDocument();
+    expect(screen.getByText('Desafiar supuestos')).toBeInTheDocument();
+    expect(screen.getByText('Estrategia ejecutable')).toBeInTheDocument();
+  });
+  it('renders step numbers 01/02/03', () => {
+    const { container } = render(<Mecanismo />);
+    expect(container.textContent).toMatch(/01.+02.+03/);
+  });
+});