diff --git a/public/control.html b/public/control.html
index 4669ddf..fc5290c 100644
--- a/public/control.html
+++ b/public/control.html
@@ -65,6 +65,11 @@
         Réglages
       </button>
     </li>
+    <li class="nav-item" role="presentation">
+      <button class="nav-link" id="admin-modal-100-tab" data-bs-toggle="tab" data-bs-target="#admin-modal-100" type="button" role="tab" aria-controls="admin-modal-100" aria-selected="false">
+        Modal 100%
+      </button>
+    </li>
     <li class="nav-item" role="presentation">
       <button class="nav-link" id="admin-users-tab" data-bs-toggle="tab" data-bs-target="#admin-users" type="button" role="tab" aria-controls="admin-users" aria-selected="false">
         Utilisateurs
@@ -99,6 +104,72 @@
       </div>
     </div>
 
+    <div class="tab-pane fade" id="admin-modal-100" role="tabpanel" aria-labelledby="admin-modal-100-tab">
+      <div class="row g-3">
+        <div class="col-12 col-xxl-6">
+          <div class="card p-3">
+            <h4 class="mb-1">Contenu “Modal 100%”</h4>
+            <p class="text-muted mb-3">
+              Contenu affiché quand un utilisateur a vu 100% des films dans la checklist.
+            </p>
+
+            <div class="mb-3">
+              <label for="completion_modal_title" class="form-label">Titre</label>
+              <input type="text" class="form-control" id="completion_modal_title" maxlength="200" placeholder="Félicitations! ...">
+            </div>
+
+            <div class="mb-3">
+              <label for="completion_modal_body_text" class="form-label">Texte (optionnel)</label>
+              <textarea class="form-control" id="completion_modal_body_text" rows="4" placeholder="Texte affiché dans le modal (retours à la ligne conservés)"></textarea>
+              <div class="form-text">Affiché en texte brut (safe). Laisse vide si tu n’en veux pas.</div>
+            </div>
+
+            <div class="mb-3">
+              <label for="completion_modal_body_html" class="form-label">HTML (optionnel)</label>
+              <textarea class="form-control font-monospace" id="completion_modal_body_html" rows="6" placeholder="<p>…</p>"></textarea>
+              <div class="form-text">
+                Affiché comme HTML (le serveur retire les <code>&lt;script&gt;</code> et les handlers <code>on*</code>).
+              </div>
+            </div>
+
+            <div class="mb-3">
+              <label for="completion_modal_video_src" class="form-label">Video src (optionnel)</label>
+              <input type="text" class="form-control" id="completion_modal_video_src" maxlength="2048" placeholder="video/reward.mp4">
+              <div class="form-text">Chemin relatif (ex: <code>video/reward.mp4</code>) ou URL complète. Vide = pas de vidéo.</div>
+            </div>
+
+            <div class="d-flex flex-wrap justify-content-end gap-2">
+              <button type="button" id="completion_modal_reload" class="btn btn-outline-secondary">Recharger</button>
+              <button type="button" id="completion_modal_save" class="btn btn-warning">Enregistrer</button>
+            </div>
+          </div>
+        </div>
+
+        <div class="col-12 col-xxl-6">
+          <div class="card p-3">
+            <h4 class="mb-1">Aperçu</h4>
+            <div class="text-muted mb-3">Aperçu live (non sauvegardé tant que tu n’enregistres pas).</div>
+
+            <div class="border rounded p-3 bg-white">
+              <div class="d-flex align-items-center justify-content-between gap-2 mb-2">
+                <div class="fw-semibold" id="completion_modal_preview_title">—</div>
+                <span class="badge bg-secondary">Preview</span>
+              </div>
+              <div id="completion_modal_preview_custom" class="text-start d-none"></div>
+              <div id="completion_modal_preview_text" class="text-start" style="white-space: pre-wrap;"></div>
+
+              <div class="mt-3">
+                <video id="completion_modal_preview_video" width="75%" controls class="d-none">
+                  <source id="completion_modal_preview_video_source" src="" type="video/mp4">
+                  Votre navigateur ne supporte pas la vidéo.
+                </video>
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+
     <div class="tab-pane fade" id="admin-users" role="tabpanel" aria-labelledby="admin-users-tab">
       <div class="row g-3">
         <div class="col-12 col-xl-8">
diff --git a/public/js/app_checklist.js b/public/js/app_checklist.js
index 01ef2fb..8bc2daa 100644
--- a/public/js/app_checklist.js
+++ b/public/js/app_checklist.js
@@ -1,6 +1,81 @@
 window.onload = async function () {
     const token = localStorage.getItem('auth_token');
 
+    const DEFAULT_COMPLETION_MODAL = Object.freeze({
+      title: 'Félicitations! very nice 🎉🎉🎉',
+      bodyText: '',
+      videoSrc: 'video/reward.mp4',
+      bodyHtml: ''
+    });
+
+    function sanitizeHtml(raw) {
+      const html = String(raw || '');
+      const withoutScripts = html.replace(/<script\b[\s\S]*?<\/script>/gi, '');
+      const withoutOnAttrs = withoutScripts
+        .replace(/\son\w+="[^"]*"/gi, '')
+        .replace(/\son\w+='[^']*'/gi, '')
+        .replace(/\son\w+=\S+/gi, '');
+      return withoutOnAttrs.trim();
+    }
+
+    async function fetchCompletionModalContent() {
+      try {
+        const res = await fetch('/api/settings/completion-modal', { method: 'GET' });
+        if (!res.ok) throw new Error('Failed to fetch completion modal');
+        const data = await res.json();
+        return {
+          title: typeof data?.title === 'string' ? data.title : DEFAULT_COMPLETION_MODAL.title,
+          bodyText: typeof data?.bodyText === 'string' ? data.bodyText : DEFAULT_COMPLETION_MODAL.bodyText,
+          videoSrc: typeof data?.videoSrc === 'string' ? data.videoSrc : DEFAULT_COMPLETION_MODAL.videoSrc,
+          bodyHtml: typeof data?.bodyHtml === 'string' ? data.bodyHtml : DEFAULT_COMPLETION_MODAL.bodyHtml,
+        };
+      } catch (_) {
+        return DEFAULT_COMPLETION_MODAL;
+      }
+    }
+
+    function applyCompletionModalContent(content) {
+      const titleEl = document.getElementById('videoModalLabel');
+      const bodyTextEl = document.getElementById('completion-modal-text');
+      const bodyCustomEl = document.getElementById('completion-modal-custom');
+      const videoEl = document.getElementById('rewardVideo');
+      const videoSourceEl = document.getElementById('rewardVideoSource');
+
+      const title = String(content?.title || '').trim() || DEFAULT_COMPLETION_MODAL.title;
+      const bodyText = String(content?.bodyText || '');
+      const bodyHtml = sanitizeHtml(String(content?.bodyHtml || ''));
+      const videoSrc = String(content?.videoSrc || '').trim();
+
+      if (titleEl) titleEl.textContent = title;
+
+      if (bodyCustomEl) {
+        if (bodyHtml) {
+          bodyCustomEl.innerHTML = bodyHtml;
+          bodyCustomEl.classList.remove('d-none');
+        } else {
+          bodyCustomEl.innerHTML = '';
+          bodyCustomEl.classList.add('d-none');
+        }
+      }
+
+      if (bodyTextEl) {
+        bodyTextEl.textContent = bodyText || '';
+        bodyTextEl.classList.toggle('d-none', !bodyText);
+      }
+
+      if (videoEl && videoSourceEl) {
+        if (videoSrc) {
+          videoSourceEl.setAttribute('src', videoSrc);
+          // reload source (so updated src is used)
+          try { videoEl.load(); } catch (_) {}
+          videoEl.classList.remove('d-none');
+        } else {
+          try { videoEl.pause(); } catch (_) {}
+          videoEl.classList.add('d-none');
+        }
+      }
+    }
+
     async function fetchActiveYear() {
       try {
         const res = await fetch('/api/settings/year', { method: 'GET' });
@@ -18,6 +93,10 @@ window.onload = async function () {
     const oscarYearEl = document.getElementById('oscar-year');
     if (oscarYearEl) oscarYearEl.textContent = String(activeYear);
 
+    // Load (public) "100% completion" modal content at runtime.
+    const completionModalContent = await fetchCompletionModalContent();
+    applyCompletionModalContent(completionModalContent);
+
     const targetDate = new Date(`March 15, ${activeYear}`);
     const currentDate = new Date();
     const timeDifference = targetDate - currentDate;
@@ -128,7 +207,11 @@ window.onload = async function () {
       if (percentage === 100) {
         videoModal.show();
         launchConfetti();
-        document.getElementById("rewardVideo").play();
+        const rewardVideo = document.getElementById("rewardVideo");
+        // Only attempt autoplay if we actually have a visible <video>.
+        if (rewardVideo && !rewardVideo.classList.contains('d-none')) {
+          rewardVideo.play().catch(() => {});
+        }
       }
     }
 
@@ -221,6 +304,7 @@ window.onload = async function () {
     const videoModal = document.getElementById("videoModal");
     const rewardVideo = document.getElementById("rewardVideo");
     videoModal.addEventListener("hidden.bs.modal", function () {
+      if (!rewardVideo) return;
       rewardVideo.pause();
       rewardVideo.currentTime = 0;
     });
diff --git a/public/js/app_control.js b/public/js/app_control.js
index d264c5c..07b4694 100644
--- a/public/js/app_control.js
+++ b/public/js/app_control.js
@@ -41,6 +41,20 @@ window.onload = async function () {
   const activeYearInput = document.getElementById('active_oscar_year');
   const saveActiveYearBtn = document.getElementById('save-active-year');
 
+  // Modal 100% elements
+  const completionModalTitleEl = document.getElementById('completion_modal_title');
+  const completionModalBodyTextEl = document.getElementById('completion_modal_body_text');
+  const completionModalBodyHtmlEl = document.getElementById('completion_modal_body_html');
+  const completionModalVideoSrcEl = document.getElementById('completion_modal_video_src');
+  const completionModalReloadBtn = document.getElementById('completion_modal_reload');
+  const completionModalSaveBtn = document.getElementById('completion_modal_save');
+
+  const completionModalPreviewTitleEl = document.getElementById('completion_modal_preview_title');
+  const completionModalPreviewTextEl = document.getElementById('completion_modal_preview_text');
+  const completionModalPreviewCustomEl = document.getElementById('completion_modal_preview_custom');
+  const completionModalPreviewVideoEl = document.getElementById('completion_modal_preview_video');
+  const completionModalPreviewVideoSourceEl = document.getElementById('completion_modal_preview_video_source');
+
   const manageYearSelect = document.getElementById('manage_year');
   const adminMoviesBody = document.getElementById('admin-movies-body');
   const refreshMoviesBtn = document.getElementById('refresh-movies');
@@ -67,12 +81,134 @@ window.onload = async function () {
   let moviesById = new Map();
   let activeYear = null;
 
+  const DEFAULT_COMPLETION_MODAL = Object.freeze({
+    title: 'Félicitations! very nice 🎉🎉🎉',
+    bodyText: '',
+    videoSrc: 'video/reward.mp4',
+    bodyHtml: '',
+  });
+
   function showResponse(kind, message) {
     responseEl.classList.remove('d-none', 'alert-success', 'alert-danger', 'alert-warning');
     responseEl.classList.add(kind === 'success' ? 'alert-success' : kind === 'warning' ? 'alert-warning' : 'alert-danger');
     responseEl.textContent = message;
   }
 
+  function sanitizeHtml(raw) {
+    const html = String(raw || '');
+    const withoutScripts = html.replace(/<script\b[\s\S]*?<\/script>/gi, '');
+    const withoutOnAttrs = withoutScripts
+      .replace(/\son\w+="[^"]*"/gi, '')
+      .replace(/\son\w+='[^']*'/gi, '')
+      .replace(/\son\w+=\S+/gi, '');
+    return withoutOnAttrs.trim();
+  }
+
+  function normalizeCompletionModal(value) {
+    const v = value && typeof value === 'object' && !Array.isArray(value) ? value : {};
+    const title = typeof v.title === 'string' ? v.title : DEFAULT_COMPLETION_MODAL.title;
+    const bodyText = typeof v.bodyText === 'string' ? v.bodyText : DEFAULT_COMPLETION_MODAL.bodyText;
+    const videoSrc = typeof v.videoSrc === 'string' ? v.videoSrc : DEFAULT_COMPLETION_MODAL.videoSrc;
+    const bodyHtml = typeof v.bodyHtml === 'string' ? v.bodyHtml : DEFAULT_COMPLETION_MODAL.bodyHtml;
+    return {
+      title: String(title || '').trim().slice(0, 200) || DEFAULT_COMPLETION_MODAL.title,
+      bodyText: String(bodyText || '').slice(0, 8000),
+      videoSrc: String(videoSrc || '').trim().slice(0, 2048),
+      bodyHtml: String(bodyHtml || '').slice(0, 20000),
+    };
+  }
+
+  async function fetchCompletionModal() {
+    const res = await fetch('/api/settings/completion-modal', { method: 'GET' });
+    if (!res.ok) throw new Error(`Erreur (${res.status})`);
+    const data = await res.json().catch(() => ({}));
+    return normalizeCompletionModal(data);
+  }
+
+  async function saveCompletionModal(payload) {
+    const res = await fetch('/api/settings/completion-modal', {
+      method: 'PUT',
+      headers: {
+        'Content-Type': 'application/json',
+        'Authorization': `Bearer ${token}`
+      },
+      body: JSON.stringify(payload)
+    });
+    const data = await res.json().catch(() => ({}));
+    if (!res.ok) {
+      const msg = data.message || data.error || `Erreur (${res.status})`;
+      throw new Error(msg);
+    }
+    return normalizeCompletionModal(data);
+  }
+
+  function setCompletionModalForm(value) {
+    if (!completionModalTitleEl || !completionModalBodyTextEl || !completionModalBodyHtmlEl || !completionModalVideoSrcEl) return;
+    completionModalTitleEl.value = value.title || '';
+    completionModalBodyTextEl.value = value.bodyText || '';
+    completionModalBodyHtmlEl.value = value.bodyHtml || '';
+    completionModalVideoSrcEl.value = value.videoSrc || '';
+  }
+
+  function getCompletionModalFormValue() {
+    return normalizeCompletionModal({
+      title: completionModalTitleEl ? completionModalTitleEl.value : '',
+      bodyText: completionModalBodyTextEl ? completionModalBodyTextEl.value : '',
+      bodyHtml: completionModalBodyHtmlEl ? completionModalBodyHtmlEl.value : '',
+      videoSrc: completionModalVideoSrcEl ? completionModalVideoSrcEl.value : '',
+    });
+  }
+
+  function updateCompletionModalPreview(value) {
+    if (completionModalPreviewTitleEl) {
+      completionModalPreviewTitleEl.textContent = value.title || DEFAULT_COMPLETION_MODAL.title;
+    }
+
+    const text = String(value.bodyText || '');
+    if (completionModalPreviewTextEl) {
+      completionModalPreviewTextEl.textContent = text;
+      completionModalPreviewTextEl.classList.toggle('d-none', !text);
+    }
+
+    const safeHtml = sanitizeHtml(value.bodyHtml || '');
+    if (completionModalPreviewCustomEl) {
+      if (safeHtml) {
+        completionModalPreviewCustomEl.innerHTML = safeHtml;
+        completionModalPreviewCustomEl.classList.remove('d-none');
+      } else {
+        completionModalPreviewCustomEl.innerHTML = '';
+        completionModalPreviewCustomEl.classList.add('d-none');
+      }
+    }
+
+    const videoSrc = String(value.videoSrc || '').trim();
+    if (completionModalPreviewVideoEl && completionModalPreviewVideoSourceEl) {
+      if (videoSrc) {
+        completionModalPreviewVideoSourceEl.setAttribute('src', videoSrc);
+        try { completionModalPreviewVideoEl.load(); } catch (_) {}
+        completionModalPreviewVideoEl.classList.remove('d-none');
+      } else {
+        try { completionModalPreviewVideoEl.pause(); } catch (_) {}
+        completionModalPreviewVideoEl.classList.add('d-none');
+      }
+    }
+  }
+
+  async function loadCompletionModalIntoUi() {
+    // If the tab isn't in DOM (older HTML), just skip gracefully.
+    if (!completionModalTitleEl) return;
+    try {
+      const value = await fetchCompletionModal();
+      setCompletionModalForm(value);
+      updateCompletionModalPreview(getCompletionModalFormValue());
+    } catch (err) {
+      // Still show defaults so admin can edit even if network hiccups.
+      setCompletionModalForm(DEFAULT_COMPLETION_MODAL);
+      updateCompletionModalPreview(getCompletionModalFormValue());
+      showResponse('warning', err.message || 'Impossible de charger le contenu du modal.');
+    }
+  }
+
   const userResetResponseEl = document.getElementById('user-reset-response');
   const userResetForm = document.getElementById('reset-user-password-form');
   const userResetEmailEl = document.getElementById('reset_user_email');
@@ -139,6 +275,55 @@ window.onload = async function () {
     window.location.href = '/';
   });
 
+  // Modal 100% live preview wiring
+  function hookModal100Inputs() {
+    if (!completionModalTitleEl) return;
+    const inputs = [completionModalTitleEl, completionModalBodyTextEl, completionModalBodyHtmlEl, completionModalVideoSrcEl].filter(Boolean);
+    inputs.forEach((el) => {
+      el.addEventListener('input', () => {
+        updateCompletionModalPreview(getCompletionModalFormValue());
+      });
+    });
+
+    if (completionModalReloadBtn) {
+      completionModalReloadBtn.addEventListener('click', async () => {
+        completionModalReloadBtn.disabled = true;
+        const oldText = completionModalReloadBtn.textContent;
+        completionModalReloadBtn.textContent = 'Chargement...';
+        try {
+          await loadCompletionModalIntoUi();
+          showResponse('success', 'Contenu rechargé.');
+        } catch (_) {
+          // loadCompletionModalIntoUi already handles messaging
+        } finally {
+          completionModalReloadBtn.disabled = false;
+          completionModalReloadBtn.textContent = oldText;
+        }
+      });
+    }
+
+    if (completionModalSaveBtn) {
+      completionModalSaveBtn.addEventListener('click', async () => {
+        completionModalSaveBtn.disabled = true;
+        const oldText = completionModalSaveBtn.textContent;
+        completionModalSaveBtn.textContent = 'Enregistrement...';
+        try {
+          const value = getCompletionModalFormValue();
+          // send raw HTML; server sanitizes/caps it
+          const saved = await saveCompletionModal(value);
+          setCompletionModalForm(saved);
+          updateCompletionModalPreview(getCompletionModalFormValue());
+          showResponse('success', 'Modal 100% enregistré.');
+        } catch (err) {
+          showResponse('danger', err.message || 'Erreur réseau');
+        } finally {
+          completionModalSaveBtn.disabled = false;
+          completionModalSaveBtn.textContent = oldText;
+        }
+      });
+    }
+  }
+
   if (userResetForm && userResetEmailEl) {
     userResetForm.addEventListener('submit', async function (e) {
       e.preventDefault();
@@ -514,6 +699,9 @@ window.onload = async function () {
     document.title = `Pool Oscars ${activeYear} - Admin`;
   }
 
+  hookModal100Inputs();
+  await loadCompletionModalIntoUi();
+
   if (saveActiveYearBtn && activeYearInput) {
     saveActiveYearBtn.addEventListener('click', async () => {
       const y = parseYear(activeYearInput.value);