diff --git a/.memory/worklog.json b/.memory/worklog.json
index d273495..04b98ca 100644
--- a/.memory/worklog.json
+++ b/.memory/worklog.json
@@ -1,18 +1,5 @@
 {
   "entries": [
-    {
-      "files_changed": 4,
-      "message": "Claude 会话活跃 · 最近命令：claude · 4 项未提交变更 · 最近提交：auto-save 2026-05-14 03:59 (~3)",
-      "ts": "2026-05-13T20:03:12Z",
-      "type": "session-heartbeat"
-    },
-    {
-      "files_changed": 6,
-      "hash": "87f1182",
-      "message": "auto-save 2026-05-14 04:04 (~6)",
-      "ts": "2026-05-14T04:04:54+08:00",
-      "type": "commit"
-    },
     {
       "files_changed": 3,
       "message": "Codex 会话活跃 · 最近命令：codex · 3 项未提交变更 · 最近提交：auto-save 2026-05-14 04:04 (~6)",
@@ -3260,6 +3247,19 @@
       "message": "auto-save 2026-05-15 20:09 (~3)",
       "hash": "053cb0b",
       "files_changed": 3
+    },
+    {
+      "ts": "2026-05-15T20:14:48+08:00",
+      "type": "commit",
+      "message": "auto-save 2026-05-15 20:14 (~5)",
+      "hash": "00a744b",
+      "files_changed": 5
+    },
+    {
+      "ts": "2026-05-15T12:14:50Z",
+      "type": "session-heartbeat",
+      "message": "Codex 会话活跃 · 最近命令：codex · 1 项未提交变更 · 最近提交：auto-save 2026-05-15 20:14 (~5)",
+      "files_changed": 1
     }
   ]
 }
diff --git a/docs/source-analysis.html b/docs/source-analysis.html
index 752c789..6b454de 100644
--- a/docs/source-analysis.html
+++ b/docs/source-analysis.html
@@ -946,6 +946,18 @@ SubjectAsset {
         <h2>变更记录</h2>
         <p>这个记录不是 git log 的替代品。它记录“产品理解发生了什么变化、影响了哪些源码、你以后描述需求时该怎么说”。后续每次改功能都要补一条。</p>
         <div class="changelog">
+          <article class="change">
+            <header>
+              <h3>2026-05-15 · 登录框固定在视口中心</h3>
+              <span class="tag rose">UI</span>
+              <span class="tag violet">Login</span>
+            </header>
+            <div class="body">
+              <p><strong>问题：</strong>组合登录框仍放在普通文档流的居中容器里，背景滚动或视口变化时视觉上会偏离画面中心。</p>
+              <p><strong>改动：</strong><code>web/app/globals.css</code> 将 <code>login-source-overlay</code> 改为固定覆盖全屏的网格层，用 <code>place-items:center</code> 居中；组合登录框自身也显式 <code>justify-self/align-self:center</code>，保证整框以视口中心为基准。</p>
+              <p><strong>影响：</strong><code>web/app/globals.css</code>、<code>docs/source-analysis.html</code>。</p>
+            </div>
+          </article>
           <article class="change">
             <header>
               <h3>2026-05-15 · 登录小人完整显示并恢复背景响应</h3>
diff --git a/web/app/globals.css b/web/app/globals.css
index 467c65a..f71da38 100644
--- a/web/app/globals.css
+++ b/web/app/globals.css
@@ -375,13 +375,14 @@
     linear-gradient(90deg, rgba(0, 0, 0, 0.22), rgba(0, 0, 0, 0.04) 44%, rgba(0, 0, 0, 0.38));
 }
 .login-source-overlay {
-  position: relative;
+  position: fixed;
+  inset: 0;
   z-index: 10;
   display: grid;
   min-height: 100vh;
-  grid-template-columns: minmax(280px, 370px);
-  align-items: center;
-  justify-content: center;
+  min-height: 100dvh;
+  grid-template-columns: minmax(0, auto);
+  place-items: center;
   padding: clamp(20px, 4vw, 56px);
   pointer-events: none;
 }
@@ -392,6 +393,8 @@
   align-items: center;
   gap: 20px;
   padding: 18px;
+  justify-self: center;
+  align-self: center;
   pointer-events: auto;
   background: rgba(10, 18, 10, 0.2);
   backdrop-filter: none;