diff --git a/static/app.js b/static/app.js
index e305128..f653c89 100644
--- a/static/app.js
+++ b/static/app.js
@@ -71,7 +71,8 @@ const ICONS = Object.freeze({
     triangleAlert: '/static/icons/triangle-alert.svg',
     user: '/static/icons/user.svg',
     wrench: '/static/icons/wrench.svg',
-    x: '/static/icons/x.svg'
+    x: '/static/icons/x.svg',
+    zap: '/static/icons/zap.svg'
 });
 
 const TOOL_ICON_MAP = Object.freeze({
@@ -219,12 +220,12 @@ async function bootstrapApp() {
                 autoScrollEnabled: true,
                 
                 // 面板宽度控制
-                leftWidth: 280,
+                leftWidth: 350,
                 rightWidth: 420,
                 rightCollapsed: true,
                 isResizing: false,
                 resizingPanel: null,
-                minPanelWidth: 200,
+                minPanelWidth: 350,
                 maxPanelWidth: 600,
                 
                 // 工具状态跟踪
diff --git a/static/icons/zap.svg b/static/icons/zap.svg
new file mode 100644
index 0000000..a64ccff
--- /dev/null
+++ b/static/icons/zap.svg
@@ -0,0 +1,13 @@
+<svg
+  xmlns="http://www.w3.org/2000/svg"
+  width="24"
+  height="24"
+  viewBox="0 0 24 24"
+  fill="none"
+  stroke="currentColor"
+  stroke-width="2"
+  stroke-linecap="round"
+  stroke-linejoin="round"
+>
+  <path d="M13 2L3 14h9l-1 8 10-12h-9z" />
+</svg>
diff --git a/static/index.html b/static/index.html
index 9acdddf..abd450c 100644
--- a/static/index.html
+++ b/static/index.html
@@ -168,21 +168,30 @@
                 <aside class="sidebar left-sidebar" :style="{ width: leftWidth + 'px' }">
                     <div class="sidebar-status">
                         <div class="compact-status-card">
-                            <div class="status-top">
-                                <span class="logo icon-label">
-                                    <span class="icon icon-md"
+                            <div class="status-line">
+                                <div class="status-brand">
+                                    <span class="icon icon-lg status-logo"
                                           :style="iconStyle('bot')"
                                           aria-hidden="true"></span>
-                                    <span>AI Agent</span>
-                                </span>
-                                <span class="agent-version" v-if="agentVersion">{{ agentVersion }}</span>
-                            </div>
-                            <div class="status-bottom">
-                                <span class="thinking-chip">{{ thinkingMode ? '思考模式' : '快速模式' }}</span>
-                                <span class="connection-chip" :class="{ connected: isConnected }">
-                                    <span class="status-dot" :class="{ active: isConnected }"></span>
-                                    {{ isConnected ? '已连接' : '未连接' }}
-                                </span>
+                                    <div class="brand-text">
+                                        <span class="brand-name">AI Agent</span>
+                                        <span class="agent-version" v-if="agentVersion">{{ agentVersion }}</span>
+                                    </div>
+                                </div>
+                                <div class="status-indicators">
+                                    <span class="mode-indicator"
+                                          :class="{ thinking: thinkingMode, fast: !thinkingMode }">
+                                        <transition name="mode-icon" mode="out-in">
+                                            <span class="icon icon-sm"
+                                                  :style="iconStyle(thinkingMode ? 'brain' : 'zap')"
+                                                  :key="thinkingMode ? 'brain' : 'zap'"
+                                                  aria-hidden="true"></span>
+                                        </transition>
+                                    </span>
+                                    <span class="connection-dot"
+                                          :class="{ active: isConnected }"
+                                          :title="isConnected ? '已连接' : '未连接'"></span>
+                                </div>
                             </div>
                         </div>
                     </div>
diff --git a/static/style.css b/static/style.css
index 1c904f6..ff51ecd 100644
--- a/static/style.css
+++ b/static/style.css
@@ -108,7 +108,7 @@ body {
 
 .agent-version {
     color: var(--claude-text-secondary);
-    font-size: 14px;
+    font-size: 16px;
 }
 
 .header-right {
@@ -135,19 +135,6 @@ body {
     gap: 6px;
 }
 
-.status-dot {
-    width: 8px;
-    height: 8px;
-    border-radius: 50%;
-    background: var(--claude-muted);
-    transition: all 0.3s ease;
-}
-
-.status-dot.active {
-    background: var(--claude-success);
-    box-shadow: 0 0 8px rgba(118, 176, 134, 0.45);
-}
-
 /* 主容器 */
 .main-container {
     display: flex;
@@ -650,47 +637,91 @@ o-conversations {
     padding: 14px 16px;
     box-shadow: 0 12px 30px rgba(61, 57, 41, 0.12);
     display: flex;
-    flex-direction: column;
-    gap: 10px;
+    align-items: center;
 }
 
-.status-top {
+.status-line {
     display: flex;
+    align-items: center;
     justify-content: space-between;
-    align-items: center;
-    font-size: 15px;
+    width: 100%;
+    gap: 18px;
 }
 
-.status-bottom {
+ .status-brand {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+}
+
+.status-logo {
+    color: var(--claude-accent);
+}
+
+.brand-text {
+    display: flex;
+    align-items: baseline;
+    gap: 8px;
+    font-weight: 600;
+    color: var(--claude-text);
+}
+
+.brand-name {
+    font-size: 16px;
+}
+
+.status-indicators {
     display: flex;
     align-items: center;
     gap: 10px;
-    flex-wrap: wrap;
 }
 
-.thinking-chip {
-    background: var(--claude-accent);
-    color: #fffef8;
-    padding: 4px 14px;
-    border-radius: 999px;
-    font-size: 12px;
-    letter-spacing: 0.02em;
-}
-
-.connection-chip {
+.mode-indicator {
+    width: 36px;
+    height: 36px;
+    border-radius: 18px;
     display: inline-flex;
     align-items: center;
-    gap: 6px;
-    padding: 4px 12px;
-    border-radius: 999px;
-    border: 1px solid rgba(118, 103, 84, 0.3);
-    font-size: 12px;
-    color: var(--claude-text-secondary);
+    justify-content: center;
+    background: var(--claude-accent);
+    color: #fffef8;
+    box-shadow: 0 8px 20px rgba(189, 93, 58, 0.25);
+    transition: background 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
 }
 
-.connection-chip.connected {
-    border-color: rgba(94, 159, 109, 0.5);
-    color: var(--claude-text);
+.mode-indicator.fast {
+    background: #ffcc4d;
+    box-shadow: 0 8px 20px rgba(255, 204, 77, 0.35);
+}
+
+.mode-indicator .icon {
+    --icon-size: 18px;
+    color: inherit;
+}
+
+.connection-dot {
+    width: 12px;
+    height: 12px;
+    border-radius: 6px;
+    background: var(--claude-muted);
+    box-shadow: 0 0 0 4px rgba(121, 109, 94, 0.18);
+    transition: background 0.2s ease, box-shadow 0.2s ease;
+}
+
+.connection-dot.active {
+    background: var(--claude-success);
+    box-shadow: 0 0 0 6px rgba(118, 176, 134, 0.25);
+}
+
+.mode-icon-enter-active,
+.mode-icon-leave-active {
+    transition: opacity 0.2s ease, transform 0.2s ease;
+}
+
+.mode-icon-enter-from,
+.mode-icon-leave-to {
+    opacity: 0;
+    transform: scale(0.5) rotate(8deg);
 }
 
 .sidebar-header {