diff --git a/.memory/worklog.json b/.memory/worklog.json
index d1a6c3f..1dc3460 100644
--- a/.memory/worklog.json
+++ b/.memory/worklog.json
@@ -1545,6 +1545,34 @@
       "message": "auto-save 2026-05-20 14:45 (~4)",
       "hash": "527ccfa",
       "files_changed": 4
+    },
+    {
+      "ts": "2026-05-20T16:33:38+08:00",
+      "type": "commit",
+      "message": "auto-save 2026-05-20 16:33 (~2)",
+      "hash": "9b1833c",
+      "files_changed": 2
+    },
+    {
+      "ts": "2026-05-20T16:39:05+08:00",
+      "type": "commit",
+      "message": "auto-save 2026-05-20 16:39 (~3)",
+      "hash": "e2465d8",
+      "files_changed": 3
+    },
+    {
+      "ts": "2026-05-20T16:44:32+08:00",
+      "type": "commit",
+      "message": "auto-save 2026-05-20 16:44 (~2)",
+      "hash": "3b04b72",
+      "files_changed": 2
+    },
+    {
+      "ts": "2026-05-20T16:48:16+08:00",
+      "type": "commit",
+      "message": "fix: improve project brief preview layout",
+      "hash": "61e597c",
+      "files_changed": 3
     }
   ]
 }
diff --git a/src/app/globals.css b/src/app/globals.css
index 015d50e..151c55f 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -479,7 +479,7 @@ input, textarea {
 
 .project-board-grid {
   display: grid;
-  grid-template-columns: minmax(250px, 310px) minmax(0, 1fr) 88px;
+  grid-template-columns: clamp(330px, 22vw, 410px) minmax(0, 1fr) 88px;
   gap: 14px;
   min-height: 0;
   flex: 1;
@@ -499,18 +499,90 @@ input, textarea {
   padding: 16px;
 }
 
+.project-primary-card {
+  position: relative;
+  border-radius: 8px;
+  background:
+    linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.028)),
+    rgba(0,0,0,0.18);
+  box-shadow:
+    0 20px 60px -40px rgba(230,245,120,0.72),
+    inset 0 0 0 1px rgba(255,255,255,0.08);
+  padding: 9px;
+}
+
 .project-primary-preview {
   position: relative;
   display: grid;
   place-items: center;
   overflow: hidden;
+  border-radius: 6px;
+  background:
+    linear-gradient(135deg, rgba(255,255,255,0.98), rgba(238,242,230,0.93));
+  aspect-ratio: 1 / 1;
+  min-height: 260px;
+  max-height: min(42vh, 460px);
+  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.52);
+}
+
+.project-primary-image {
+  width: 100%;
+  height: 100%;
+  object-fit: contain;
+  transform: scale(0.98);
+  transition: transform 200ms ease, filter 200ms ease;
+}
+
+.project-primary-card:hover .project-primary-image {
+  filter: contrast(1.02) saturate(1.02);
+  transform: scale(1.015);
+}
+
+.project-primary-meta {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  padding: 9px 2px 1px;
+}
+
+.project-image-popover {
+  position: fixed;
+  z-index: 120;
+  top: 50%;
+  left: 50%;
+  width: min(76vw, 920px);
+  height: min(82vh, 780px);
+  display: grid;
+  place-items: center;
+  border: 1px solid rgba(255,255,255,0.16);
   border-radius: 8px;
-  background: rgba(255,255,255,0.92);
-  aspect-ratio: 4 / 3;
-  min-height: 190px;
-  box-shadow:
-    0 20px 60px -38px rgba(230,245,120,0.7),
-    inset 0 0 0 1px rgba(255,255,255,0.36);
+  background:
+    linear-gradient(135deg, rgba(255,255,255,0.10), rgba(255,255,255,0.035)),
+    rgba(9, 10, 8, 0.86);
+  box-shadow: 0 30px 120px -28px rgba(0,0,0,0.94);
+  opacity: 0;
+  overflow: hidden;
+  pointer-events: none;
+  transform: translate(-50%, -48%) scale(0.96);
+  transition: opacity 180ms ease, transform 180ms ease;
+  visibility: hidden;
+}
+
+.project-image-popover--open {
+  opacity: 1;
+  transform: translate(-50%, -50%) scale(1);
+  visibility: visible;
+}
+
+.project-image-popover img {
+  position: absolute;
+  inset: 18px;
+  width: calc(100% - 36px);
+  height: calc(100% - 36px);
+  object-fit: contain;
+  border-radius: 6px;
+  background: rgba(255,255,255,0.96);
 }
 
 .project-stat {
@@ -534,6 +606,31 @@ input, textarea {
   padding: 13px;
 }
 
+.project-spec-row {
+  display: grid;
+  grid-template-columns: 42px minmax(0, 1fr);
+  gap: 10px;
+  align-items: start;
+  border-top: 1px solid rgba(255,255,255,0.06);
+  padding-top: 8px;
+}
+
+.project-spec-row:first-child {
+  border-top: 0;
+  padding-top: 0;
+}
+
+.project-spec-label {
+  color: rgba(255,255,255,0.36);
+  line-height: 1.55;
+}
+
+.project-spec-value {
+  color: rgba(255,255,255,0.78);
+  line-height: 1.55;
+  overflow-wrap: anywhere;
+}
+
 .project-production-panel {
   min-height: 0;
   overflow: hidden;
@@ -642,11 +739,22 @@ input, textarea {
   }
 
   .project-board-grid {
-    grid-template-columns: minmax(280px, 340px) minmax(0, 1fr) 96px;
+    grid-template-columns: clamp(370px, 22vw, 440px) minmax(0, 1fr) 96px;
     gap: 18px;
   }
 }
 
+@media (prefers-reduced-motion: reduce) {
+  .project-primary-image,
+  .project-image-popover {
+    transition: none;
+  }
+
+  .project-primary-card:hover .project-primary-image {
+    transform: none;
+  }
+}
+
 @media (max-width: 1180px) {
   .project-shell {
     overflow: auto;
@@ -677,6 +785,14 @@ input, textarea {
     overflow: visible;
   }
 
+  .project-primary-preview {
+    min-height: 220px;
+  }
+
+  .project-image-popover {
+    display: none;
+  }
+
   .session-workspace {
     height: auto;
     min-height: 0;
diff --git a/src/app/page.tsx b/src/app/page.tsx
index e265162..3bc33c1 100644
--- a/src/app/page.tsx
+++ b/src/app/page.tsx
@@ -1,6 +1,7 @@
 'use client';
 
 import { useCallback, useEffect, useState } from 'react';
+import { createPortal } from 'react-dom';
 import PromptPanel from '@/components/PromptPanel';
 import Sidebar from '@/components/Sidebar';
 import PackPanel from '@/components/PackPanel';
@@ -55,6 +56,18 @@ function ProjectStat({ label, value, tone }: { label: string; value: string | nu
   );
 }
 
+function ProjectSpecField({ label, value }: { label: string; value?: string | string[] }) {
+  const text = Array.isArray(value) ? value.filter(Boolean).join('、') : value;
+  if (!text) return null;
+
+  return (
+    <div className="project-spec-row">
+      <span className="project-spec-label">{label}</span>
+      <span className="project-spec-value">{text}</span>
+    </div>
+  );
+}
+
 function ReferenceStrip({ session }: { session: GenSession }) {
   const refs = imageSourcesForSession(session);
   if (!refs.length) return null;
@@ -76,6 +89,7 @@ function ProjectBrief({ session }: { session: GenSession }) {
   const primaryImage = selectedImages[0] ?? session.images[0] ?? null;
   const generatedAssets = (session.packs ?? []).reduce((sum, pack) => sum + pack.assets.length, 0);
   const totalSlots = packSlotTotal();
+  const [previewOpen, setPreviewOpen] = useState(false);
 
   return (
     <section className="project-brief-panel">
@@ -93,12 +107,26 @@ function ProjectBrief({ session }: { session: GenSession }) {
       </div>
 
       {primaryImage && (
-        <div className="project-primary-preview mt-5">
-          <img src={primaryImage.url} alt="当前主方案" className="h-full w-full object-contain" />
-          <div className="absolute inset-x-0 bottom-0 flex items-center justify-between gap-3 bg-gradient-to-t from-black/72 to-transparent p-3">
+        <div
+          className="project-primary-card mt-5"
+          onMouseEnter={() => setPreviewOpen(true)}
+          onMouseLeave={() => setPreviewOpen(false)}
+          onFocus={() => setPreviewOpen(true)}
+          onBlur={() => setPreviewOpen(false)}
+        >
+          <div className="project-primary-preview">
+            <img src={primaryImage.url} alt="当前主方案" className="project-primary-image" />
+          </div>
+          <div className="project-primary-meta">
             <span className="text-[10px] font-semibold uppercase tracking-[0.16em] text-white/70">Primary</span>
             <span className="text-[10px] text-white/50">{primaryImage.status === 'selected' ? '已选中' : '待筛选'}</span>
           </div>
+          {previewOpen && typeof document !== 'undefined' && createPortal(
+            <div className="project-image-popover project-image-popover--open" aria-hidden="true">
+              <img src={primaryImage.url} alt="" />
+            </div>,
+            document.body,
+          )}
         </div>
       )}
 
@@ -115,17 +143,14 @@ function ProjectBrief({ session }: { session: GenSession }) {
             <span className="text-[10px] text-[#e6f578]/70">已锁定</span>
           </div>
           <div className="mt-3 space-y-2 text-[11px]">
-            {[
-              ['形态', session.characterSpec.speciesShape],
-              ['比例', session.characterSpec.bodyRatio],
-              ['配色', session.characterSpec.colorPalette.join('、')],
-              ['材料', session.characterSpec.materials.join('、')],
-            ].map(([label, value]) => (
-              <div key={label} className="grid grid-cols-[42px_minmax(0,1fr)] gap-2">
-                <span className="text-white/35">{label}</span>
-                <span className="truncate text-white/75">{value}</span>
-              </div>
-            ))}
+            <ProjectSpecField label="形态" value={session.characterSpec.speciesShape} />
+            <ProjectSpecField label="比例" value={session.characterSpec.bodyRatio} />
+            <ProjectSpecField label="五官" value={session.characterSpec.faceFeatures} />
+            <ProjectSpecField label="配色" value={session.characterSpec.colorPalette} />
+            <ProjectSpecField label="材料" value={session.characterSpec.materials} />
+            <ProjectSpecField label="配件" value={session.characterSpec.accessories} />
+            <ProjectSpecField label="识别" value={session.characterSpec.signatureElements} />
+            <ProjectSpecField label="打样" value={session.characterSpec.manufacturingNotes} />
           </div>
         </div>
       ) : (