diff --git a/.claude/commands/release.md b/.claude/commands/release.md
index 4065b835..3708ccd2 100644
--- a/.claude/commands/release.md
+++ b/.claude/commands/release.md
@@ -8,13 +8,14 @@ allowed-tools: ["Read", "Edit", "Bash", "Glob", "Grep"]
 
 ## 版本号规则
 
-| 变更类型 | 版本跳动 |
-|---------|---------|
-| `feature` | `+0.1.0` |
-| `bugfix` | `+0.0.1` |
+| 变更类型 | 版本跳动 | 适用场景 |
+|---------|---------|---------|
+| `feature` | `+0.1.0` | 纯新功能，无 bugfix |
+| `improvement` | `+0.0.1` | UI 调整、小功能增强、bugfix 混合，或以 UI/体验改进为主的迭代 |
+| `bugfix` | `+0.0.1` | 纯 bug 修复，无新功能 |
 | `docs` / `maintenance` / `refactor` | 默认不发版，除非用户明确要求 |
 
-意图混合时以用户明确描述为准。
+意图混合时以用户明确描述为准；bugfix + 小 feature 混合默认判定为 `improvement`（`+0.0.1`）。
 
 ## 必须同步更新的文件
 
diff --git a/VERSION b/VERSION
index 1b58cc10..83b47304 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.27.0
+0.27.1
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 180543e6..cc248fd8 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -5,8 +5,22 @@ All notable changes to `planet` are documented here.
 This project follows the repository versioning rule:
 
 - `feature` -> `+0.1.0`
+- `improvement` -> `+0.0.1`（bugfix + 小功能混合）
 - `bugfix` -> `+0.0.1`
 
+## [0.27.1] — 2026-04-14
+
+### 🔧 Improvements
+- 面板拖拽新增 L 形边界约束，其他面板无法覆盖 brand 面板区域，并从右侧/底部自然卡边
+- brand 组件引入 `--brand-scale` 整体缩放变量，padding 与内容尺寸独立控制
+- 图层控制面板宽度收窄（260px），与 brand 面板错落排列，间距调大
+
+### 🐛 Fixes
+- 修复搜索框 `type="search"` 导致清除按钮重复显示的问题
+- 修复 `[hidden]` 属性被组件 `display` 规则覆盖的问题
+
+---
+
 ## 0.27.0
 
 Released: 2026-04-14
diff --git a/docs/version-history.md b/docs/version-history.md
index e1cf4469..bc053719 100644
--- a/docs/version-history.md
+++ b/docs/version-history.md
@@ -16,12 +16,13 @@
 ## Current Version
 
 - `main` 当前主线历史推导到：`0.16.5`
-- `dev` 当前开发分支历史推导到：`0.27.0`
+- `dev` 当前开发分支历史推导到：`0.27.1`
 
 ## Timeline
 
 | Version | Type | Branch | Commit | Summary |
 | --- | --- | --- | --- | --- |
+| `0.27.1` | improvement | `dev` | — | HUD 面板拖拽 L 形边界约束、brand 组件整体缩放、图层面板宽度优化、搜索叉叉修复 |
 | `0.27.0` | feature | `dev` | — | Earth HUD 重构：图层面板、信息卡片悬浮定位、Fresnel 大气层渲染 |
 | `0.0.1-beta` | bootstrap | `main` | `e7033775` | first commit |
 | `0.1.0` | feature | `main` | `6cb4398f` | Modularize 3D Earth page with ES Modules |
diff --git a/frontend/package.json b/frontend/package.json
index 9b4570d2..3ff0b8d6 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "planet-frontend",
-  "version": "0.27.0",
+  "version": "0.27.1",
   "private": true,
   "packageManager": "bun@1",
   "dependencies": {
diff --git a/frontend/public/earth/css/base.css b/frontend/public/earth/css/base.css
index c54831f9..6f138f47 100644
--- a/frontend/public/earth/css/base.css
+++ b/frontend/public/earth/css/base.css
@@ -55,6 +55,9 @@ body,
   height: 100%;
 }
 
+/* Ensure [hidden] always wins over component display rules */
+[hidden] { display: none !important; }
+
 body.earth-page {
   font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   background-color: #0a0a1a;
diff --git a/frontend/public/earth/css/info-panel.css b/frontend/public/earth/css/info-panel.css
index 05f82979..91539fca 100644
--- a/frontend/public/earth/css/info-panel.css
+++ b/frontend/public/earth/css/info-panel.css
@@ -24,8 +24,9 @@
 /* ── Brand panel ──────────────────────────────────────────────── */
 
 .hud-panel-brand {
+  --brand-scale: 0.88;
   border-radius: 0;
-  padding: calc(12px * var(--hud-scale)) calc(14px * var(--hud-scale));
+  padding: calc(18px * var(--hud-scale)) calc(20px * var(--hud-scale));
   display: flex;
   align-items: center;
   justify-content: center;
@@ -36,15 +37,15 @@
 .hud-panel-brand .earth-brand {
   display: flex;
   align-items: center;
-  gap: calc(10px * var(--hud-scale));
+  gap: calc(10px * var(--hud-scale) * var(--brand-scale));
   min-width: 0;
 }
 
 .hud-panel-brand .earth-brand__logo {
   display: block;
   flex: 0 0 auto;
-  width: calc(128px * var(--hud-scale));
-  height: calc(128px * var(--hud-scale));
+  width: calc(128px * var(--hud-scale) * var(--brand-scale));
+  height: calc(128px * var(--hud-scale) * var(--brand-scale));
   object-fit: contain;
 }
 
@@ -54,28 +55,28 @@
   min-width: 0;
   flex-direction: column;
   justify-content: center;
-  gap: calc(5px * var(--hud-scale));
+  gap: calc(5px * var(--hud-scale) * var(--brand-scale));
 }
 
 .hud-panel-brand .earth-brand__title {
   display: block;
-  width: min(100%, calc(160px * var(--hud-scale)));
+  width: min(100%, calc(160px * var(--hud-scale) * var(--brand-scale)));
   max-width: 100%;
   height: auto;
-  min-height: calc(20px * var(--hud-scale));
+  min-height: calc(20px * var(--hud-scale) * var(--brand-scale));
   object-fit: contain;
 }
 
 .hud-panel-brand .earth-brand__meta {
   display: flex;
   flex-direction: column;
-  gap: calc(2px * var(--hud-scale));
+  gap: calc(2px * var(--hud-scale) * var(--brand-scale));
   width: fit-content;
 }
 
 .hud-panel-brand .earth-brand__subtitle {
   color: var(--hud-text-muted);
-  font-size: calc(0.74rem * var(--hud-scale));
+  font-size: calc(0.74rem * var(--hud-scale) * var(--brand-scale));
   line-height: 1.3;
   font-weight: 500;
   letter-spacing: 0.01em;
@@ -89,7 +90,7 @@
 
 .hud-panel-brand .earth-brand__description {
   color: var(--hud-text-soft);
-  font-size: calc(0.6rem * var(--hud-scale));
+  font-size: calc(0.6rem * var(--hud-scale) * var(--brand-scale));
   line-height: 1.3;
   letter-spacing: 0.08em;
   width: fit-content;
@@ -100,7 +101,7 @@
 }
 
 .hud-panel-brand .earth-brand--en .earth-brand__title {
-  width: min(100%, calc(172px * var(--hud-scale)));
+  width: min(100%, calc(172px * var(--hud-scale) * var(--brand-scale)));
 }
 
 .hud-panel-brand .earth-brand--en .earth-brand__subtitle,
diff --git a/frontend/public/earth/css/layer-panel.css b/frontend/public/earth/css/layer-panel.css
index 1a88dc31..f219f2cc 100644
--- a/frontend/public/earth/css/layer-panel.css
+++ b/frontend/public/earth/css/layer-panel.css
@@ -1,13 +1,13 @@
 /* layer-panel.css — layer toggle panel (below brand, in left column) */
 
 .hud-panel-layers {
-  /* Lives inside .earth-left-column — position is relative via column rule */
+  /* Lives inside .earth-left-column — narrower than brand panel intentionally */
   border-radius: 0;
   padding: 0;
-  width: 100%;
+  width: calc(260px * var(--hud-scale));
   z-index: 10;
   overflow: hidden;
-  margin-top: calc(6px * var(--hud-scale));
+  margin-top: calc(12px * var(--hud-scale));
 }
 
 /* ── Header / drag handle ─────────────────────────────────────── */
diff --git a/frontend/public/earth/index.html b/frontend/public/earth/index.html
index 267833d0..7866140f 100644
--- a/frontend/public/earth/index.html
+++ b/frontend/public/earth/index.html
@@ -71,7 +71,7 @@
           <div class="layer-panel-search">
             <span class="material-symbols-rounded layer-panel-search-icon">search</span>
             <input
-              type="search"
+              type="text"
               id="layer-search-input"
               class="layer-panel-search-input"
               placeholder="搜索图层..."
diff --git a/frontend/public/earth/js/controls.js b/frontend/public/earth/js/controls.js
index ec7a9bdf..b7734a28 100644
--- a/frontend/public/earth/js/controls.js
+++ b/frontend/public/earth/js/controls.js
@@ -193,14 +193,31 @@ function setupDraggableHudPanels() {
       if (!isDragging) return;
       const appRect = app.getBoundingClientRect();
       const panelRect = panel.getBoundingClientRect();
-      const nextLeft = Math.min(
+      const brandPanel = document.getElementById("brand-panel");
+      const brandRect = brandPanel ? brandPanel.getBoundingClientRect() : null;
+      const brandBottom = brandRect ? brandRect.bottom - appRect.top : 0;
+      const brandRight = brandRect ? brandRect.right - appRect.left : 0;
+
+      let nextLeft = Math.min(
         Math.max(startLeft + (event.clientX - startPointerX), 0),
         appRect.width - panelRect.width,
       );
-      const nextTop = Math.min(
+      let nextTop = Math.min(
         Math.max(startTop + (event.clientY - startPointerY), 0),
         appRect.height - panelRect.height,
       );
+      // Brand 面板形成 L 形禁区：panel 不能进入 brand 左上角矩形区域。
+      // 当两个轴同时越界时，比较两侧超出量——哪侧需要的调整量更小就卡哪侧。
+      // 从右侧滑入 → leftAdjust 小 → 卡右边；从下方滑入 → topAdjust 小 → 卡底边。
+      if (brandRect && nextLeft < brandRight && nextTop < brandBottom) {
+        const leftAdjust = brandRight - nextLeft;
+        const topAdjust = brandBottom - nextTop;
+        if (leftAdjust <= topAdjust) {
+          nextLeft = brandRight;
+        } else {
+          nextTop = brandBottom;
+        }
+      }
 
       panel.style.left = `${nextLeft}px`;
       panel.style.top = `${nextTop}px`;
diff --git a/pyproject.toml b/pyproject.toml
index 7b23fa4b..2d6af6c3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "planet"
-version = "0.27.0"
+version = "0.27.1"
 description = "智能星球计划 - 态势感知系统"
 requires-python = ">=3.14"
 dependencies = [
diff --git a/uv.lock b/uv.lock
index 03261efe..7e53e530 100644
--- a/uv.lock
+++ b/uv.lock
@@ -475,7 +475,7 @@ wheels = [
 
 [[package]]
 name = "planet"
-version = "0.27.0"
+version = "0.27.1"
 source = { virtual = "." }
 dependencies = [
     { name = "aiofiles" },