diff --git a/frontend/app.js b/frontend/app.js
index b5cee4a..57e29d0 100644
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -2183,20 +2183,10 @@
       window.open(popoutUrl, `popout_${data.vault}_${data.path.replace(/[^a-zA-Z0-9]/g, '_')}`, 'width=1000,height=700,menubar=no,toolbar=no,location=no,status=no,resizable=yes,scrollbars=no');
     });
 
-    // Frontmatter
+    // Frontmatter — Accent Card
     let fmSection = null;
     if (data.frontmatter && Object.keys(data.frontmatter).length > 0) {
-      const fmToggle = el("div", { class: "frontmatter-toggle" }, [
-        document.createTextNode("▶ Frontmatter"),
-      ]);
-      const fmContent = el("div", { class: "frontmatter-content" }, [
-        document.createTextNode(JSON.stringify(data.frontmatter, null, 2)),
-      ]);
-      fmToggle.addEventListener("click", () => {
-        fmContent.classList.toggle("open");
-        fmToggle.textContent = fmContent.classList.contains("open") ? "▼ Frontmatter" : "▶ Frontmatter";
-      });
-      fmSection = el("div", {}, [fmToggle, fmContent]);
+      fmSection = buildFrontmatterCard(data.frontmatter);
     }
 
     // Content container (rendered HTML)
@@ -3419,6 +3409,186 @@
     });
   }
 
+  // ---------------------------------------------------------------------------
+  // Frontmatter Accent Card Builder
+  // ---------------------------------------------------------------------------
+  
+  function buildFrontmatterCard(frontmatter) {
+    // Helper: format date
+    function formatDate(iso) {
+      if (!iso) return '—';
+      const d = new Date(iso);
+      const date = d.toISOString().slice(0, 10);
+      const time = d.toTimeString().slice(0, 5);
+      return `${date} · ${time}`;
+    }
+
+    // Extract boolean flags
+    const booleanFlags = ['publish', 'favoris', 'template', 'task', 'archive', 'draft', 'private']
+      .map(key => ({ key, value: !!frontmatter[key] }));
+
+    // Toggle state
+    let isOpen = true;
+
+    // Build header with chevron
+    const chevron = el("span", { class: "fm-chevron open" });
+    chevron.innerHTML = '<i data-lucide="chevron-down" style="width:14px;height:14px"></i>';
+    
+    const fmHeader = el("div", { class: "fm-header" }, [
+      chevron,
+      document.createTextNode("Frontmatter")
+    ]);
+
+    // ZONE 1: Top strip
+    const topBadges = [];
+    
+    // Title badge
+    const title = frontmatter.titre || frontmatter.title || '';
+    if (title) {
+      topBadges.push(el("span", { class: "ac-title" }, [document.createTextNode(`"${title}"`)]));
+    }
+
+    // Status badge
+    if (frontmatter.statut) {
+      const statusBadge = el("span", { class: "ac-badge green" }, [
+        el("span", { class: "ac-dot" }),
+        document.createTextNode(frontmatter.statut)
+      ]);
+      topBadges.push(statusBadge);
+    }
+
+    // Category badge
+    if (frontmatter.catégorie || frontmatter.categorie) {
+      const cat = frontmatter.catégorie || frontmatter.categorie;
+      const catBadge = el("span", { class: "ac-badge blue" }, [
+        document.createTextNode(cat)
+      ]);
+      topBadges.push(catBadge);
+    }
+
+    // Publish badge
+    if (frontmatter.publish) {
+      topBadges.push(el("span", { class: "ac-badge purple" }, [
+        document.createTextNode("publié")
+      ]));
+    }
+
+    // Favoris badge
+    if (frontmatter.favoris) {
+      topBadges.push(el("span", { class: "ac-badge purple" }, [
+        document.createTextNode("favori")
+      ]));
+    }
+
+    const acTop = el("div", { class: "ac-top" }, topBadges);
+
+    // ZONE 2: Body 2 columns
+    const leftCol = el("div", { class: "ac-col" }, [
+      el("div", { class: "ac-row" }, [
+        el("span", { class: "ac-k" }, [document.createTextNode("auteur")]),
+        el("span", { class: "ac-v" }, [document.createTextNode(frontmatter.auteur || '—')])
+      ]),
+      el("div", { class: "ac-row" }, [
+        el("span", { class: "ac-k" }, [document.createTextNode("catégorie")]),
+        el("span", { class: "ac-v" }, [document.createTextNode(frontmatter.catégorie || frontmatter.categorie || '—')])
+      ]),
+      el("div", { class: "ac-row" }, [
+        el("span", { class: "ac-k" }, [document.createTextNode("statut")]),
+        el("span", { class: "ac-v" }, [document.createTextNode(frontmatter.statut || '—')])
+      ]),
+      el("div", { class: "ac-row" }, [
+        el("span", { class: "ac-k" }, [document.createTextNode("aliases")]),
+        el("span", { class: "ac-v muted" }, [
+          document.createTextNode(
+            frontmatter.aliases && frontmatter.aliases.length > 0 
+              ? frontmatter.aliases.join(', ') 
+              : '[]'
+          )
+        ])
+      ])
+    ]);
+
+    const rightCol = el("div", { class: "ac-col" }, [
+      el("div", { class: "ac-row" }, [
+        el("span", { class: "ac-k" }, [document.createTextNode("creation_date")]),
+        el("span", { class: "ac-v mono" }, [document.createTextNode(formatDate(frontmatter.creation_date))])
+      ]),
+      el("div", { class: "ac-row" }, [
+        el("span", { class: "ac-k" }, [document.createTextNode("modification_date")]),
+        el("span", { class: "ac-v mono" }, [document.createTextNode(formatDate(frontmatter.modification_date))])
+      ]),
+      el("div", { class: "ac-row" }, [
+        el("span", { class: "ac-k" }, [document.createTextNode("publish")]),
+        el("span", { class: "ac-v" }, [document.createTextNode(String(frontmatter.publish || false))])
+      ]),
+      el("div", { class: "ac-row" }, [
+        el("span", { class: "ac-k" }, [document.createTextNode("favoris")]),
+        el("span", { class: "ac-v" }, [document.createTextNode(String(frontmatter.favoris || false))])
+      ])
+    ]);
+
+    const acBody = el("div", { class: "ac-body" }, [leftCol, rightCol]);
+
+    // ZONE 3: Tags row
+    const tagPills = [];
+    if (frontmatter.tags && frontmatter.tags.length > 0) {
+      frontmatter.tags.forEach(tag => {
+        tagPills.push(el("span", { class: "ac-tag" }, [document.createTextNode(tag)]));
+      });
+    }
+
+    const acTagsRow = el("div", { class: "ac-tags-row" }, [
+      el("span", { class: "ac-tags-k" }, [document.createTextNode("tags")]),
+      el("div", { class: "ac-tags-wrap" }, tagPills)
+    ]);
+
+    // ZONE 4: Flags row
+    const flagChips = [];
+    booleanFlags.forEach(flag => {
+      const chipClass = flag.value ? "flag-chip on" : "flag-chip off";
+      flagChips.push(el("span", { class: chipClass }, [
+        el("span", { class: "flag-dot" }),
+        document.createTextNode(flag.key)
+      ]));
+    });
+
+    const acFlagsRow = el("div", { class: "ac-flags-row" }, [
+      el("span", { class: "ac-flags-k" }, [document.createTextNode("flags")]),
+      ...flagChips
+    ]);
+
+    // Assemble the card
+    const acCard = el("div", { class: "ac-card" }, [
+      acTop,
+      acBody,
+      acTagsRow,
+      acFlagsRow
+    ]);
+
+    // Toggle functionality
+    fmHeader.addEventListener("click", () => {
+      isOpen = !isOpen;
+      if (isOpen) {
+        acCard.style.display = "block";
+        chevron.classList.remove("closed");
+        chevron.classList.add("open");
+      } else {
+        acCard.style.display = "none";
+        chevron.classList.remove("open");
+        chevron.classList.add("closed");
+      }
+      safeCreateIcons();
+    });
+
+    // Wrap in section
+    const fmSection = el("div", { class: "fm-section" }, [
+      fmHeader,
+      acCard
+    ]);
+
+    return fmSection;
+  }
+
   // ---------------------------------------------------------------------------
   // Helpers
   // ---------------------------------------------------------------------------
diff --git a/frontend/popout.html b/frontend/popout.html
index 9a6e907..2c9571c 100644
--- a/frontend/popout.html
+++ b/frontend/popout.html
@@ -135,23 +135,9 @@
         header.appendChild(actionsDiv);
         area.appendChild(header);
 
-        // Frontmatter
+        // Frontmatter — Accent Card
         if (data.frontmatter && Object.keys(data.frontmatter).length > 0) {
-          const fmSection = document.createElement("div");
-          const fmToggle = document.createElement("div");
-          fmToggle.className = "frontmatter-toggle";
-          fmToggle.textContent = "▶ Frontmatter";
-          const fmContent = document.createElement("div");
-          fmContent.className = "frontmatter-content";
-          fmContent.textContent = JSON.stringify(data.frontmatter, null, 2);
-          
-          fmToggle.addEventListener("click", () => {
-            fmContent.classList.toggle("open");
-            fmToggle.textContent = fmContent.classList.contains("open") ? "▼ Frontmatter" : "▶ Frontmatter";
-          });
-          
-          fmSection.appendChild(fmToggle);
-          fmSection.appendChild(fmContent);
+          const fmSection = buildFrontmatterCard(data.frontmatter);
           area.appendChild(fmSection);
         }
 
@@ -197,6 +183,186 @@
       return item;
     }
 
+    function buildFrontmatterCard(frontmatter) {
+      // Helper: format date
+      function formatDate(iso) {
+        if (!iso) return '—';
+        const d = new Date(iso);
+        const date = d.toISOString().slice(0, 10);
+        const time = d.toTimeString().slice(0, 5);
+        return `${date} · ${time}`;
+      }
+
+      // Helper: create element
+      function el(tag, className, children) {
+        const e = document.createElement(tag);
+        if (className) e.className = className;
+        if (children) {
+          children.forEach(c => { if (c) e.appendChild(c); });
+        }
+        return e;
+      }
+
+      // Extract boolean flags
+      const booleanFlags = ['publish', 'favoris', 'template', 'task', 'archive', 'draft', 'private']
+        .map(key => ({ key, value: !!frontmatter[key] }));
+
+      // Toggle state
+      let isOpen = true;
+
+      // Build header with chevron
+      const chevron = el("span", "fm-chevron open");
+      chevron.innerHTML = '<i data-lucide="chevron-down" style="width:14px;height:14px"></i>';
+      
+      const fmHeader = el("div", "fm-header");
+      fmHeader.appendChild(chevron);
+      fmHeader.appendChild(document.createTextNode("Frontmatter"));
+
+      // ZONE 1: Top strip
+      const acTop = el("div", "ac-top");
+      
+      // Title badge
+      const title = frontmatter.titre || frontmatter.title || '';
+      if (title) {
+        const titleSpan = el("span", "ac-title");
+        titleSpan.textContent = `"${title}"`;
+        acTop.appendChild(titleSpan);
+      }
+
+      // Status badge
+      if (frontmatter.statut) {
+        const statusBadge = el("span", "ac-badge green");
+        const dot = el("span", "ac-dot");
+        statusBadge.appendChild(dot);
+        statusBadge.appendChild(document.createTextNode(frontmatter.statut));
+        acTop.appendChild(statusBadge);
+      }
+
+      // Category badge
+      if (frontmatter.catégorie || frontmatter.categorie) {
+        const cat = frontmatter.catégorie || frontmatter.categorie;
+        const catBadge = el("span", "ac-badge blue");
+        catBadge.textContent = cat;
+        acTop.appendChild(catBadge);
+      }
+
+      // Publish badge
+      if (frontmatter.publish) {
+        const pubBadge = el("span", "ac-badge purple");
+        pubBadge.textContent = "publié";
+        acTop.appendChild(pubBadge);
+      }
+
+      // Favoris badge
+      if (frontmatter.favoris) {
+        const favBadge = el("span", "ac-badge purple");
+        favBadge.textContent = "favori";
+        acTop.appendChild(favBadge);
+      }
+
+      // ZONE 2: Body 2 columns
+      const leftCol = el("div", "ac-col");
+      
+      const row1 = el("div", "ac-row");
+      row1.innerHTML = '<span class="ac-k">auteur</span><span class="ac-v">' + (frontmatter.auteur || '—') + '</span>';
+      leftCol.appendChild(row1);
+      
+      const row2 = el("div", "ac-row");
+      row2.innerHTML = '<span class="ac-k">catégorie</span><span class="ac-v">' + (frontmatter.catégorie || frontmatter.categorie || '—') + '</span>';
+      leftCol.appendChild(row2);
+      
+      const row3 = el("div", "ac-row");
+      row3.innerHTML = '<span class="ac-k">statut</span><span class="ac-v">' + (frontmatter.statut || '—') + '</span>';
+      leftCol.appendChild(row3);
+      
+      const row4 = el("div", "ac-row");
+      const aliases = frontmatter.aliases && frontmatter.aliases.length > 0 ? frontmatter.aliases.join(', ') : '[]';
+      row4.innerHTML = '<span class="ac-k">aliases</span><span class="ac-v muted">' + aliases + '</span>';
+      leftCol.appendChild(row4);
+
+      const rightCol = el("div", "ac-col");
+      
+      const row5 = el("div", "ac-row");
+      row5.innerHTML = '<span class="ac-k">creation_date</span><span class="ac-v mono">' + formatDate(frontmatter.creation_date) + '</span>';
+      rightCol.appendChild(row5);
+      
+      const row6 = el("div", "ac-row");
+      row6.innerHTML = '<span class="ac-k">modification_date</span><span class="ac-v mono">' + formatDate(frontmatter.modification_date) + '</span>';
+      rightCol.appendChild(row6);
+      
+      const row7 = el("div", "ac-row");
+      row7.innerHTML = '<span class="ac-k">publish</span><span class="ac-v">' + String(frontmatter.publish || false) + '</span>';
+      rightCol.appendChild(row7);
+      
+      const row8 = el("div", "ac-row");
+      row8.innerHTML = '<span class="ac-k">favoris</span><span class="ac-v">' + String(frontmatter.favoris || false) + '</span>';
+      rightCol.appendChild(row8);
+
+      const acBody = el("div", "ac-body");
+      acBody.appendChild(leftCol);
+      acBody.appendChild(rightCol);
+
+      // ZONE 3: Tags row
+      const acTagsRow = el("div", "ac-tags-row");
+      const tagsLabel = el("span", "ac-tags-k");
+      tagsLabel.textContent = "tags";
+      acTagsRow.appendChild(tagsLabel);
+      
+      const tagsWrap = el("div", "ac-tags-wrap");
+      if (frontmatter.tags && frontmatter.tags.length > 0) {
+        frontmatter.tags.forEach(tag => {
+          const tagSpan = el("span", "ac-tag");
+          tagSpan.textContent = tag;
+          tagsWrap.appendChild(tagSpan);
+        });
+      }
+      acTagsRow.appendChild(tagsWrap);
+
+      // ZONE 4: Flags row
+      const acFlagsRow = el("div", "ac-flags-row");
+      const flagsLabel = el("span", "ac-flags-k");
+      flagsLabel.textContent = "flags";
+      acFlagsRow.appendChild(flagsLabel);
+      
+      booleanFlags.forEach(flag => {
+        const chipClass = flag.value ? "flag-chip on" : "flag-chip off";
+        const chip = el("span", chipClass);
+        const dot = el("span", "flag-dot");
+        chip.appendChild(dot);
+        chip.appendChild(document.createTextNode(flag.key));
+        acFlagsRow.appendChild(chip);
+      });
+
+      // Assemble the card
+      const acCard = el("div", "ac-card");
+      acCard.appendChild(acTop);
+      acCard.appendChild(acBody);
+      acCard.appendChild(acTagsRow);
+      acCard.appendChild(acFlagsRow);
+
+      // Toggle functionality
+      fmHeader.addEventListener("click", () => {
+        isOpen = !isOpen;
+        if (isOpen) {
+          acCard.style.display = "block";
+          chevron.classList.remove("closed");
+          chevron.classList.add("open");
+        } else {
+          acCard.style.display = "none";
+          chevron.classList.remove("open");
+          chevron.classList.add("closed");
+        }
+        if (window.lucide) window.lucide.createIcons();
+      });
+
+      // Wrap in section
+      const fmSection = el("div", "fm-section");
+      fmSection.appendChild(fmHeader);
+      fmSection.appendChild(acCard);
+
+      return fmSection;
+    }
+
     window.onload = initPopout;
   </script>
 </body>
diff --git a/frontend/style.css b/frontend/style.css
index 862e396..e208722 100644
--- a/frontend/style.css
+++ b/frontend/style.css
@@ -30,6 +30,25 @@
   --danger-bg: #3d1a18;
   --success: #3fb950;
   --success-bg: #1a3d1f;
+  
+  /* Accent Card variables */
+  --accent-card: #58a6ff;
+  --accent-bg: #1f2a3a;
+  --accent-text: #79c0ff;
+  --green: #3fb950;
+  --green-bg: #1a3d1f;
+  --purple: #a371f7;
+  --purple-bg: #2d1b4e;
+  --surface: #161b22;
+  --surface2: #0f1117;
+  --surface3: #0d0f14;
+  --border-md: #30363d;
+  --text: #e6edf3;
+  --text-2: #8b949e;
+  --text-3: #484f58;
+  --mono: 'JetBrains Mono', monospace;
+  --radius: 6px;
+  --radius-lg: 10px;
 }
 
 /* ===== THEME — LIGHT ===== */
@@ -55,6 +74,25 @@
   --danger-bg: #ffebe9;
   --success: #1a7f37;
   --success-bg: #dafbe1;
+  
+  /* Accent Card variables */
+  --accent-card: #4f6ef7;
+  --accent-bg: #eef1fe;
+  --accent-text: #2540c9;
+  --green: #1a7f50;
+  --green-bg: #eaf5ee;
+  --purple: #6b40c4;
+  --purple-bg: #f1ecfd;
+  --surface: #ffffff;
+  --surface2: #f2f1ef;
+  --surface3: #ebe9e6;
+  --border-md: rgba(0,0,0,0.13);
+  --text: #1a1917;
+  --text-2: #6b6a67;
+  --text-3: #a09e9b;
+  --mono: 'JetBrains Mono', monospace;
+  --radius: 6px;
+  --radius-lg: 10px;
 }
 
 /* ===== BASE ===== */
@@ -1061,35 +1099,214 @@ select {
   background: var(--tag-bg);
 }
 
-/* Frontmatter collapsible */
-.frontmatter-toggle {
+/* ===== FRONTMATTER — ACCENT CARD ===== */
+
+/* Frontmatter section wrapper */
+.fm-section {
+  margin-bottom: 20px;
+}
+
+/* Header toggle */
+.fm-header {
   font-family: 'JetBrains Mono', monospace;
   font-size: 0.78rem;
   color: var(--text-muted);
   cursor: pointer;
   display: inline-flex;
   align-items: center;
-  gap: 4px;
+  gap: 6px;
   margin-bottom: 12px;
   user-select: none;
+  transition: color 150ms ease;
 }
-.frontmatter-toggle:hover {
+.fm-header:hover {
   color: var(--text-secondary);
 }
-.frontmatter-content {
-  background: var(--code-bg);
-  border: 1px solid var(--border);
-  border-radius: 8px;
+
+/* Chevron icon */
+.fm-chevron {
+  transition: transform 0.2s;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+}
+.fm-chevron.open {
+  transform: rotate(0deg);
+}
+.fm-chevron.closed {
+  transform: rotate(-90deg);
+}
+
+/* Accent Card main container */
+.ac-card {
+  border: 1px solid var(--border-md);
+  border-left: 3px solid var(--accent-card);
+  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
+  background: var(--surface);
+  overflow: hidden;
+}
+
+/* ZONE 1 — Top strip */
+.ac-top {
+  padding: 12px 16px 10px;
+  border-bottom: 1px solid var(--border);
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  flex-wrap: wrap;
+}
+.ac-title {
+  font-size: 14px;
+  font-weight: 600;
+  color: var(--text);
+  font-family: var(--mono);
+  letter-spacing: -0.01em;
+  flex-shrink: 0;
+}
+.ac-badge {
+  padding: 2px 9px;
+  border-radius: 99px;
+  font-size: 11px;
+  font-weight: 500;
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+}
+.ac-badge.green {
+  background: var(--green-bg);
+  color: var(--green);
+}
+.ac-badge.blue {
+  background: var(--accent-bg);
+  color: var(--accent-text);
+}
+.ac-badge.purple {
+  background: var(--purple-bg);
+  color: var(--purple);
+}
+.ac-dot {
+  width: 6px;
+  height: 6px;
+  border-radius: 50%;
+  background: currentColor;
+  opacity: 0.7;
+}
+
+/* ZONE 2 — Body 2 columns */
+.ac-body {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 0;
+}
+.ac-col {
   padding: 12px 16px;
-  margin-bottom: 20px;
-  font-family: 'JetBrains Mono', monospace;
-  font-size: 0.8rem;
-  color: var(--text-secondary);
-  white-space: pre-wrap;
-  display: none;
 }
-.frontmatter-content.open {
-  display: block;
+.ac-col + .ac-col {
+  border-left: 1px solid var(--border);
+}
+.ac-row {
+  display: flex;
+  align-items: baseline;
+  gap: 6px;
+  padding: 4px 0;
+  font-size: 12.5px;
+}
+.ac-row + .ac-row {
+  border-top: 1px solid var(--border);
+}
+.ac-k {
+  color: var(--text-3);
+  font-size: 11px;
+  font-family: var(--mono);
+  min-width: 110px;
+  flex-shrink: 0;
+}
+.ac-v {
+  color: var(--text);
+  font-weight: 500;
+  font-size: 12.5px;
+}
+.ac-v.mono {
+  font-family: var(--mono);
+  font-weight: 400;
+  color: var(--text-2);
+  font-size: 11px;
+}
+.ac-v.muted {
+  color: var(--text-3);
+  font-weight: 400;
+}
+
+/* ZONE 3 — Tags row */
+.ac-tags-row {
+  padding: 10px 16px;
+  border-top: 1px solid var(--border);
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+.ac-tags-k {
+  font-size: 11px;
+  font-family: var(--mono);
+  color: var(--text-3);
+  flex-shrink: 0;
+}
+.ac-tags-wrap {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 4px;
+}
+.ac-tag {
+  padding: 2px 9px;
+  border-radius: 99px;
+  font-size: 11px;
+  font-weight: 500;
+  background: var(--accent-bg);
+  color: var(--accent-text);
+  border: 1px solid rgba(79, 110, 247, 0.18);
+}
+
+/* ZONE 4 — Flags row */
+.ac-flags-row {
+  padding: 9px 16px;
+  border-top: 1px solid var(--border);
+  background: var(--surface2);
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+  align-items: center;
+}
+.ac-flags-k {
+  font-size: 11px;
+  font-family: var(--mono);
+  color: var(--text-3);
+  margin-right: 2px;
+}
+.flag-chip {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  padding: 2px 8px;
+  border-radius: var(--radius);
+  font-size: 11px;
+  font-weight: 500;
+  border: 1px solid var(--border-md);
+}
+.flag-chip.on {
+  background: var(--green-bg);
+  color: var(--green);
+  border-color: rgba(26, 127, 80, 0.2);
+}
+.flag-chip.off {
+  background: var(--surface3);
+  color: var(--text-3);
+}
+.flag-dot {
+  width: 5px;
+  height: 5px;
+  border-radius: 50%;
+  background: currentColor;
+  opacity: 0.7;
 }
 
 /* --- Raw source view --- */