diff --git a/src/components/Ambition.astro b/src/components/Ambition.astro
index be72c95..06e9b13 100644
--- a/src/components/Ambition.astro
+++ b/src/components/Ambition.astro
@@ -1,7 +1,7 @@
 ---
 ---
 
-<section id="ambition" class="section relative overflow-hidden">
+<section id="mission" class="section relative overflow-hidden">
   <!-- Halo background -->
   <div
     aria-hidden="true"
@@ -11,7 +11,7 @@
 
   <div class="container-narrow">
     <div class="section-title-block">
-      <span class="eyebrow">Ambition</span>
+      <span class="eyebrow">Mission</span>
       <h2 class="h-section mt-4">
         D'une station côtière à un grand réseau de mesure.
       </h2>
diff --git a/src/components/Configurateur.astro b/src/components/Configurateur.astro
new file mode 100644
index 0000000..70d45f8
--- /dev/null
+++ b/src/components/Configurateur.astro
@@ -0,0 +1,280 @@
+---
+const sensors = [
+  { id: 'hydro',   cat: 'Acoustique',     label: 'Hydrophone',            desc: "Écoute continue du milieu sous-marin." },
+  { id: 'temp',    cat: 'Physico-chimie', label: 'Température',           desc: 'Sonde étanche intégrée.' },
+  { id: 'cond',    cat: 'Physico-chimie', label: 'Conductivité / salinité', desc: '' },
+  { id: 'o2',      cat: 'Physico-chimie', label: 'Oxygène dissous',        desc: '' },
+  { id: 'ph',      cat: 'Physico-chimie', label: 'pH',                     desc: '' },
+  { id: 'turb',    cat: 'Physico-chimie', label: 'Turbidité',              desc: '' },
+  { id: 'chloro',  cat: 'Physico-chimie', label: 'Chlorophylle-a',         desc: '' },
+  { id: 'no3',     cat: 'Physico-chimie', label: 'Nitrates',               desc: '' },
+  { id: 'cam',     cat: 'Optique',        label: 'Caméra sous-marine',     desc: '' },
+  { id: 'led',     cat: 'Optique',        label: 'Éclairage LED',          desc: '' },
+  { id: 'weather', cat: 'Météo',          label: 'Station météo',          desc: 'Vent, pression, air.' },
+  { id: 'current', cat: 'Courants',       label: 'Courantométrie',         desc: '' },
+];
+
+const defaults = ['hydro', 'temp'];
+
+const cats = Array.from(new Set(sensors.map((s) => s.cat)));
+---
+
+<section id="configurateur" class="section">
+  <div class="container-narrow">
+    <div class="section-title-block">
+      <span class="eyebrow">Configurateur</span>
+      <h2 class="h-section mt-4">Composez votre rocher. Rejoignez le réseau.</h2>
+      <p class="lead mt-6">
+        Chaque site a ses enjeux. Cochez les grandeurs que vous voulez mesurer, ajustez
+        l'énergie et l'ancrage, et envoyez-nous votre configuration — nous revenons vers
+        vous avec une proposition adaptée. Chaque rocher déployé rejoint automatiquement
+        le réseau <strong class="text-foam-50">mesher</strong> NowYouSea, qui couvre le
+        littoral au fur et à mesure.
+      </p>
+    </div>
+
+    <div class="mt-10 grid gap-8 lg:grid-cols-[1.15fr_1fr]">
+      <!-- Left : selection -->
+      <div class="space-y-8">
+        <!-- Sensors -->
+        <div>
+          <h3 class="font-display text-lg font-semibold text-foam-50">Grandeurs à mesurer</h3>
+          <p class="mt-1 text-xs text-foam-100/60">Cliquez pour activer / désactiver.</p>
+
+          <div class="mt-5 space-y-5">
+            {cats.map((cat) => (
+              <div>
+                <div class="text-[11px] font-medium uppercase tracking-[0.18em] text-lagoon-400/80">{cat}</div>
+                <div class="mt-2 flex flex-wrap gap-2">
+                  {sensors.filter((s) => s.cat === cat).map((s) => (
+                    <button
+                      type="button"
+                      class="nys-sensor group relative flex items-center gap-2 rounded-full border border-white/10 bg-white/[0.03] px-3.5 py-1.5 text-sm text-foam-100/80 transition hover:border-tide-400/40 hover:text-foam-50"
+                      data-sensor-id={s.id}
+                      data-sensor-label={s.label}
+                      data-sensor-cat={s.cat}
+                      data-default={defaults.includes(s.id) ? 'true' : 'false'}
+                      title={s.desc}
+                    >
+                      <svg viewBox="0 0 24 24" class="nys-sensor-check h-3.5 w-3.5 text-tide-300 opacity-0 transition-opacity" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">
+                        <path d="M20 6L9 17l-5-5"/>
+                      </svg>
+                      <span class="nys-sensor-label">{s.label}</span>
+                    </button>
+                  ))}
+                </div>
+              </div>
+            ))}
+          </div>
+        </div>
+
+        <!-- Options -->
+        <div class="grid gap-5 sm:grid-cols-2">
+          <div>
+            <h3 class="font-display text-lg font-semibold text-foam-50">Énergie</h3>
+            <div class="mt-3 flex flex-wrap gap-2">
+              <button type="button" class="nys-opt rounded-full border border-white/10 bg-white/[0.03] px-3.5 py-1.5 text-sm text-foam-100/80 transition hover:border-tide-400/40 hover:text-foam-50" data-opt-group="energy" data-opt-value="Solaire" data-default="true">Solaire</button>
+              <button type="button" class="nys-opt rounded-full border border-white/10 bg-white/[0.03] px-3.5 py-1.5 text-sm text-foam-100/80 transition hover:border-tide-400/40 hover:text-foam-50" data-opt-group="energy" data-opt-value="Solaire + éolien">Solaire + éolien</button>
+            </div>
+          </div>
+          <div>
+            <h3 class="font-display text-lg font-semibold text-foam-50">Ancrage</h3>
+            <div class="mt-3 flex flex-wrap gap-2">
+              <button type="button" class="nys-opt rounded-full border border-white/10 bg-white/[0.03] px-3.5 py-1.5 text-sm text-foam-100/80 transition hover:border-tide-400/40 hover:text-foam-50" data-opt-group="anchor" data-opt-value="Standard" data-default="true">Standard</button>
+              <button type="button" class="nys-opt rounded-full border border-white/10 bg-white/[0.03] px-3.5 py-1.5 text-sm text-foam-100/80 transition hover:border-tide-400/40 hover:text-foam-50" data-opt-group="anchor" data-opt-value="Renforcé">Renforcé (courants forts)</button>
+            </div>
+          </div>
+        </div>
+      </div>
+
+      <!-- Right : summary + CTA -->
+      <aside class="lg:sticky lg:top-20">
+        <div class="card relative overflow-hidden">
+          <div class="pointer-events-none absolute inset-0 -z-10 opacity-60" style="background: radial-gradient(ellipse at 60% 20%, rgba(56,189,248,0.12), transparent 55%);"></div>
+
+          <div class="flex items-center gap-3">
+            <span class="relative inline-flex h-10 w-10 items-center justify-center rounded-lg bg-gradient-to-br from-tide-500/30 to-lagoon-500/20 ring-1 ring-tide-400/30">
+              <svg viewBox="0 0 24 24" class="h-5 w-5 text-tide-300" fill="currentColor" aria-hidden="true">
+                <path d="M4 17c0-4 3-6 5-6 1 0 2-3 5-3s4 2 4 4c1 0 2 1 2 3s-2 4-5 4H6c-1 0-2-1-2-2z"/>
+              </svg>
+            </span>
+            <div>
+              <div class="text-[10px] font-medium uppercase tracking-[0.2em] text-tide-400">Votre rocher</div>
+              <div class="font-display text-lg font-semibold text-foam-50">
+                <span id="nys-sensor-count">0</span>
+                <span class="text-foam-100/60 text-sm font-normal"> · grandeur<span id="nys-sensor-plural"></span></span>
+              </div>
+            </div>
+          </div>
+
+          <ul id="nys-sensor-list" class="mt-5 space-y-2 text-sm text-foam-100/85 min-h-[140px]"></ul>
+
+          <div class="mt-5 grid gap-3 text-xs">
+            <div class="flex items-center justify-between rounded-lg bg-abyss-900/50 px-3 py-2 ring-1 ring-white/5">
+              <span class="text-foam-100/55 uppercase tracking-wider text-[10px]">Énergie</span>
+              <span id="nys-energy" class="text-foam-50">—</span>
+            </div>
+            <div class="flex items-center justify-between rounded-lg bg-abyss-900/50 px-3 py-2 ring-1 ring-white/5">
+              <span class="text-foam-100/55 uppercase tracking-wider text-[10px]">Ancrage</span>
+              <span id="nys-anchor" class="text-foam-50">—</span>
+            </div>
+            <div class="flex items-center justify-between rounded-lg bg-abyss-900/50 px-3 py-2 ring-1 ring-white/5">
+              <span class="text-foam-100/55 uppercase tracking-wider text-[10px]">Transmission</span>
+              <span class="text-foam-50">Sans fil</span>
+            </div>
+          </div>
+
+          <button
+            type="button"
+            id="nys-join-btn"
+            class="btn btn-primary mt-6 w-full justify-center"
+          >
+            Connecter mon rocher au réseau
+            <svg viewBox="0 0 24 24" class="h-4 w-4" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">
+              <path d="M5 12h14M13 5l7 7-7 7"/>
+            </svg>
+          </button>
+
+          <p class="mt-3 text-[11px] text-foam-100/50">
+            Nous vous revenons sous 48 h avec une proposition chiffrée adaptée à votre site.
+          </p>
+        </div>
+
+        <!-- Mesh hint -->
+        <div class="mt-6 rounded-xl border border-white/5 bg-white/[0.02] px-5 py-4 text-xs leading-relaxed text-foam-100/70">
+          <div class="flex items-center gap-2">
+            <span class="relative inline-flex h-2 w-2">
+              <span class="absolute inline-flex h-full w-full animate-ping rounded-full bg-tide-400 opacity-60"></span>
+              <span class="relative inline-flex h-2 w-2 rounded-full bg-tide-400"></span>
+            </span>
+            <span class="font-medium uppercase tracking-widest text-[10px] text-tide-400">Réseau mesher</span>
+          </div>
+          <p class="mt-2">
+            Chaque rocher partage son signal avec ses voisins et consolide la couverture
+            de la zone — plus il y a de rochers, plus la carte devient précise.
+          </p>
+        </div>
+      </aside>
+    </div>
+  </div>
+</section>
+
+<script is:inline>
+  (() => {
+    const state = {
+      sensors: new Map(), // id -> { label, cat }
+      energy: 'Solaire',
+      anchor: 'Standard',
+    };
+
+    const activeCls = ['bg-tide-500/15', 'border-tide-400/40', 'text-foam-50'];
+
+    function setBtnActive(btn, active) {
+      btn.dataset.active = active ? 'true' : 'false';
+      activeCls.forEach((c) => btn.classList.toggle(c, active));
+      const check = btn.querySelector('.nys-sensor-check');
+      if (check) check.classList.toggle('opacity-100', active);
+    }
+
+    function render() {
+      const countEl = document.getElementById('nys-sensor-count');
+      const pluralEl = document.getElementById('nys-sensor-plural');
+      const listEl = document.getElementById('nys-sensor-list');
+      const energyEl = document.getElementById('nys-energy');
+      const anchorEl = document.getElementById('nys-anchor');
+
+      const n = state.sensors.size;
+      countEl.textContent = String(n);
+      pluralEl.textContent = n > 1 ? 's mesurées' : (n === 1 ? ' mesurée' : ' à choisir');
+
+      if (n === 0) {
+        listEl.innerHTML = '<li class="text-foam-100/50 italic">Aucune grandeur sélectionnée — choisissez au moins l\'hydrophone pour l\'acoustique.</li>';
+      } else {
+        const byCat = {};
+        state.sensors.forEach((v, id) => {
+          (byCat[v.cat] = byCat[v.cat] || []).push(v.label);
+        });
+        listEl.innerHTML = Object.entries(byCat).map(([cat, labels]) => `
+          <li>
+            <div class="text-[10px] uppercase tracking-widest text-foam-100/45">${cat}</div>
+            <div class="mt-0.5">${labels.join(' · ')}</div>
+          </li>
+        `).join('');
+      }
+
+      energyEl.textContent = state.energy;
+      anchorEl.textContent = state.anchor;
+    }
+
+    // Wire sensors
+    document.querySelectorAll('.nys-sensor').forEach((btn) => {
+      const id = btn.dataset.sensorId;
+      const label = btn.dataset.sensorLabel;
+      const cat = btn.dataset.sensorCat;
+      const isDefault = btn.dataset.default === 'true';
+
+      if (isDefault) {
+        state.sensors.set(id, { label, cat });
+        setBtnActive(btn, true);
+      }
+
+      btn.addEventListener('click', () => {
+        if (state.sensors.has(id)) {
+          state.sensors.delete(id);
+          setBtnActive(btn, false);
+        } else {
+          state.sensors.set(id, { label, cat });
+          setBtnActive(btn, true);
+        }
+        render();
+      });
+    });
+
+    // Wire options (energy / anchor)
+    document.querySelectorAll('.nys-opt').forEach((btn) => {
+      const group = btn.dataset.optGroup;
+      const value = btn.dataset.optValue;
+      const isDefault = btn.dataset.default === 'true';
+
+      if (isDefault) {
+        state[group] = value;
+        setBtnActive(btn, true);
+      }
+
+      btn.addEventListener('click', () => {
+        // single-select group
+        document.querySelectorAll(`.nys-opt[data-opt-group="${group}"]`).forEach((b) => setBtnActive(b, false));
+        setBtnActive(btn, true);
+        state[group] = value;
+        render();
+      });
+    });
+
+    // CTA : pre-fill contact form + scroll
+    const joinBtn = document.getElementById('nys-join-btn');
+    if (joinBtn) {
+      joinBtn.addEventListener('click', () => {
+        const sensorList = Array.from(state.sensors.values()).map((s) => s.label).join(', ');
+        const summary = `Configuration rocher NowYouSea :\n`
+          + `— Grandeurs : ${sensorList || '(aucune)'}\n`
+          + `— Énergie : ${state.energy}\n`
+          + `— Ancrage : ${state.anchor}\n`
+          + `— Transmission : sans fil`;
+
+        const ta = document.querySelector('#contact textarea')
+          || document.querySelector('textarea[name="message"]')
+          || document.querySelector('textarea');
+        if (ta) {
+          const existing = ta.value && ta.value.trim().length > 0 ? ta.value.trim() + '\n\n' : '';
+          ta.value = existing + summary;
+          ta.dispatchEvent(new Event('input', { bubbles: true }));
+        }
+
+        const contact = document.getElementById('contact');
+        if (contact) contact.scrollIntoView({ behavior: 'smooth', block: 'start' });
+      });
+    }
+
+    render();
+  })();
+</script>
diff --git a/src/components/Hero.astro b/src/components/Hero.astro
index e10c2b6..793bdf2 100644
--- a/src/components/Hero.astro
+++ b/src/components/Hero.astro
@@ -1,7 +1,7 @@
 ---
 ---
 
-<section class="relative overflow-hidden pt-16 md:pt-24 pb-24 md:pb-32">
+<section id="top" class="relative overflow-hidden pt-16 md:pt-24 pb-24 md:pb-32">
   <!-- Ambient caustic glow -->
   <div class="pointer-events-none absolute inset-0 caustic-bg"></div>
 
diff --git a/src/components/Nav.astro b/src/components/Nav.astro
index 1863cc5..a1beef9 100644
--- a/src/components/Nav.astro
+++ b/src/components/Nav.astro
@@ -1,15 +1,9 @@
 ---
 const base = import.meta.env.BASE_URL;
 const items = [
-  { href: '#concept', label: 'Concept' },
-  { href: '#ambition', label: 'Ambition' },
-  { href: '#pourquoi', label: 'Pourquoi' },
-  { href: '#configurations', label: 'Configurations' },
-  { href: '#architecture', label: 'Architecture' },
-  { href: '#cas-dusage', label: "Cas d'usage" },
-  { href: '#equipe', label: 'Équipe' },
-  { href: '#roadmap', label: 'Feuille de route' },
-  { href: '#contact', label: 'Contact' },
+  { href: '#top', label: 'Accueil' },
+  { href: '#mission', label: 'Mission' },
+  { href: '#configurateur', label: 'Configurateur' },
 ];
 ---
 
@@ -26,8 +20,8 @@ const items = [
       <span class="font-display text-base font-semibold tracking-tight whitespace-nowrap">NowYouSea</span>
     </a>
 
-    <nav aria-label="Navigation principale" class="hidden flex-1 justify-center xl:flex">
-      <ul class="flex items-center gap-5 text-sm text-foam-100/75">
+    <nav aria-label="Navigation principale" class="hidden flex-1 justify-center md:flex">
+      <ul class="flex items-center gap-8 text-sm text-foam-100/75">
         {items.map((item) => (
           <li>
             <a href={item.href} class="whitespace-nowrap hover:text-tide-400">{item.label}</a>
@@ -36,7 +30,7 @@ const items = [
       </ul>
     </nav>
 
-    <div class="ml-auto shrink-0 xl:ml-0">
+    <div class="ml-auto shrink-0 md:ml-0">
       <a href="#contact" class="btn btn-primary hidden whitespace-nowrap md:inline-flex">
         Demander une démo
         <svg viewBox="0 0 24 24" class="h-4 w-4" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">
diff --git a/src/pages/index.astro b/src/pages/index.astro
index dcd56ed..2840672 100644
--- a/src/pages/index.astro
+++ b/src/pages/index.astro
@@ -4,6 +4,7 @@ import Nav from '../components/Nav.astro';
 import Hero from '../components/Hero.astro';
 import Concept from '../components/Concept.astro';
 import Ambition from '../components/Ambition.astro';
+import Configurateur from '../components/Configurateur.astro';
 import Pourquoi from '../components/Pourquoi.astro';
 import Configurations from '../components/Configurations.astro';
 import Architecture from '../components/Architecture.astro';
@@ -18,8 +19,9 @@ import Footer from '../components/Footer.astro';
   <Nav />
   <main id="main">
     <Hero />
-    <Concept />
     <Ambition />
+    <Configurateur />
+    <Concept />
     <Pourquoi />
     <Configurations />
     <Architecture />