diff --git a/.gitignore b/.gitignore
index 2427d71..ee73c2d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,4 +24,6 @@ Thumbs.db
 
 # ---- Obsidian ----
 .obsidian/
-.claudian/sessions/conv-1781943335504-q62bzosye.meta.json
+.claudian/
+修改过程笔记/
+学习复盘/
diff --git a/frontend/src/App.css b/frontend/src/App.css
index e4e9938..c5fe341 100644
--- a/frontend/src/App.css
+++ b/frontend/src/App.css
@@ -495,7 +495,10 @@ body {
   display: flex;
   flex-direction: column;
   padding: 16px 20px;
-  gap: 10px;
+  gap: 12px;
+  overflow-y: auto;
+  scrollbar-width: thin;
+  scrollbar-color: var(--color-border) transparent;
 }
 
 .video-container {
@@ -652,7 +655,7 @@ body {
   flex-direction: column;
   align-items: center;
   gap: 10px;
-  padding: 8px 0;
+  padding: 10px 0 4px;
 }
 
 .video-controls__row {
@@ -1387,11 +1390,228 @@ body {
 
 .video-controls__toolbar {
   display: flex;
-  gap: 6px;
+  gap: 8px;
   flex-wrap: wrap;
   justify-content: center;
+  align-items: center;
 }
 
+/* ---- Round Control Buttons (Camera / Mic) ---- */
+
+.btn-ctrl-round {
+  width: 44px;
+  height: 44px;
+  border-radius: 50%;
+  border: 2px solid var(--color-border);
+  background: var(--color-surface-2);
+  color: var(--color-text-muted);
+  cursor: pointer;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  transition: all var(--transition-fast);
+  flex-shrink: 0;
+  position: relative;
+}
+
+.btn-ctrl-round:hover {
+  background: var(--color-surface-3);
+  border-color: var(--color-surface-3);
+  color: var(--color-text);
+  transform: scale(1.06);
+}
+
+.btn-ctrl-round:active {
+  transform: scale(0.95);
+}
+
+.btn-ctrl-round--on {
+  background: rgba(52, 211, 153, 0.1);
+  border-color: rgba(52, 211, 153, 0.3);
+  color: var(--color-success);
+}
+
+.btn-ctrl-round--on:hover {
+  background: rgba(52, 211, 153, 0.18);
+  border-color: rgba(52, 211, 153, 0.45);
+}
+
+.btn-ctrl-round--off {
+  background: rgba(248, 113, 113, 0.08);
+  border-color: rgba(248, 113, 113, 0.2);
+  color: var(--color-error);
+}
+
+.btn-ctrl-round--off:hover {
+  background: rgba(248, 113, 113, 0.15);
+  border-color: rgba(248, 113, 113, 0.35);
+}
+
+.btn-ctrl-round--speaking {
+  animation: micPulse 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) infinite;
+  box-shadow: 0 0 14px rgba(52, 211, 153, 0.45);
+}
+
+/* ---- Pill Control Buttons (Recognize / Interrupt / Stop) ---- */
+
+.btn-ctrl-pill {
+  padding: 8px 16px;
+  border-radius: 22px;
+  font-size: 0.78rem;
+  font-weight: 500;
+  cursor: pointer;
+  transition: all var(--transition-fast);
+  display: inline-flex;
+  align-items: center;
+  gap: 5px;
+  border: 1px solid var(--color-border);
+  background: var(--color-surface-2);
+  color: var(--color-text-muted);
+  white-space: nowrap;
+}
+
+.btn-ctrl-pill:hover:not(:disabled) {
+  background: var(--color-surface-3);
+  color: var(--color-text);
+  border-color: var(--color-surface-3);
+}
+
+.btn-ctrl-pill:active:not(:disabled) {
+  transform: translateY(1px);
+}
+
+.btn-ctrl-pill:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+.btn-ctrl-pill--recognize {
+  background: rgba(59, 130, 246, 0.1);
+  color: var(--color-primary);
+  border-color: rgba(59, 130, 246, 0.25);
+}
+
+.btn-ctrl-pill--recognize:hover:not(:disabled) {
+  background: rgba(59, 130, 246, 0.2);
+  border-color: rgba(59, 130, 246, 0.4);
+}
+
+.btn-ctrl-pill--interrupt {
+  background: rgba(251, 191, 36, 0.1);
+  color: var(--color-warning);
+  border-color: rgba(251, 191, 36, 0.25);
+}
+
+.btn-ctrl-pill--interrupt:hover:not(:disabled) {
+  background: rgba(251, 191, 36, 0.2);
+  border-color: rgba(251, 191, 36, 0.4);
+}
+
+.btn-ctrl-pill--stop {
+  background: rgba(248, 113, 113, 0.1);
+  color: var(--color-error);
+  border-color: rgba(248, 113, 113, 0.2);
+}
+
+.btn-ctrl-pill--stop:hover:not(:disabled) {
+  background: rgba(248, 113, 113, 0.18);
+  border-color: rgba(248, 113, 113, 0.35);
+}
+
+/* ---- Scenario Picker Grid (video panel) ---- */
+
+.scenario-picker {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.scenario-picker__title {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 0 2px;
+}
+
+.scenario-picker__label {
+  font-size: 0.65rem;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.08em;
+  color: var(--color-text-muted);
+  opacity: 0.7;
+}
+
+.scenario-picker__active {
+  font-size: 0.7rem;
+  color: var(--color-primary);
+  font-weight: 500;
+}
+
+.scenario-picker__grid {
+  display: grid;
+  grid-template-columns: repeat(3, 1fr);
+  gap: 6px;
+}
+
+.scenario-picker__card {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 4px;
+  padding: 10px 4px;
+  border-radius: var(--radius-sm);
+  border: 1px solid var(--color-border);
+  background: var(--color-surface-2);
+  color: var(--color-text-muted);
+  cursor: pointer;
+  transition: all var(--transition-fast);
+  text-align: center;
+  min-width: 0;
+}
+
+.scenario-picker__card:hover {
+  background: var(--color-surface-3);
+  border-color: var(--color-surface-3);
+  color: var(--color-text);
+  transform: translateY(-1px);
+  box-shadow: 0 2px 8px rgba(10, 10, 15, 0.15);
+}
+
+.scenario-picker__card:active {
+  transform: translateY(0);
+}
+
+.scenario-picker__card--active {
+  background: rgba(59, 130, 246, 0.08);
+  border-color: rgba(59, 130, 246, 0.35);
+  color: var(--color-primary);
+}
+
+.scenario-picker__card--active:hover {
+  background: rgba(59, 130, 246, 0.14);
+  border-color: rgba(59, 130, 246, 0.45);
+  color: var(--color-primary);
+}
+
+.scenario-picker__card-icon {
+  font-size: 1.3rem;
+  line-height: 1;
+}
+
+.scenario-picker__card-name {
+  font-size: 0.68rem;
+  font-weight: 500;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  max-width: 100%;
+  letter-spacing: 0.01em;
+}
+
+/* ---- Legacy button styles kept for backward compat ---- */
+
 .btn--recognize {
   background: rgba(59, 130, 246, 0.1);
   color: var(--color-primary);
@@ -1416,35 +1636,37 @@ body {
 /* Device selectors */
 .video-controls__devices {
   display: flex;
-  gap: 12px;
+  gap: 8px;
   justify-content: center;
+  width: 100%;
 }
 
 .device-select-wrapper {
   display: flex;
-  flex-direction: column;
-  gap: 4px;
   align-items: center;
+  gap: 6px;
+  flex: 1;
+  min-width: 0;
 }
 
 .device-select-label {
-  font-size: 0.65rem;
+  font-size: 0.72rem;
   color: var(--color-text-muted);
-  font-weight: 500;
-  letter-spacing: 0.01em;
+  flex-shrink: 0;
 }
 
 .device-select {
-  padding: 5px 10px;
-  font-size: 0.72rem;
-  border-radius: var(--radius-sm);
+  flex: 1;
+  min-width: 0;
+  padding: 5px 8px;
+  font-size: 0.7rem;
+  border-radius: 6px;
   border: 1px solid var(--color-border);
   background: var(--color-surface-2);
   color: var(--color-text-muted);
   cursor: pointer;
   transition: all var(--transition-fast);
-  min-width: 120px;
-  text-align: center;
+  text-overflow: ellipsis;
 }
 
 .device-select:hover {
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 89e84d6..09b1910 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -401,6 +401,27 @@ function AppContent() {
             )}
           </div>
 
+          {/* ---- 情景选择卡片网格（视频下方） ---- */}
+          <div className="scenario-picker">
+            <div className="scenario-picker__title">
+              <span className="scenario-picker__label">{tr("settings.scenario")}</span>
+              <span className="scenario-picker__active">{activeScenario.icon} {activeScenario.nameKey ? tr(activeScenario.nameKey) : activeScenario.name}</span>
+            </div>
+            <div className="scenario-picker__grid">
+              {allScenarios.map((sc) => (
+                <button
+                  key={sc.id}
+                  className={`scenario-picker__card ${config.scenario === sc.id ? "scenario-picker__card--active" : ""}`}
+                  onClick={() => handleSelectScenario(sc.id)}
+                  title={sc.description ? sc.description : sc.descKey ? tr(sc.descKey) : sc.name}
+                >
+                  <span className="scenario-picker__card-icon">{sc.icon}</span>
+                  <span className="scenario-picker__card-name">{sc.nameKey ? tr(sc.nameKey) : sc.name}</span>
+                </button>
+              ))}
+            </div>
+          </div>
+
           {/* 视频下方控制区（三层结构） */}
           <div className="video-controls">
             {!isConnected ? (
@@ -415,33 +436,68 @@ function AppContent() {
                 {/* 视频通话态：核心控制工具栏 */}
                 <div className="video-controls__toolbar">
                   <button
-                    className={`btn btn--ctrl ${isCameraOn ? "btn--ctrl-on" : "btn--ctrl-off"}`}
+                    className={`btn-ctrl-round ${isCameraOn ? "btn-ctrl-round--on" : "btn-ctrl-round--off"}`}
                     onClick={toggleCamera}
                     title={isCameraOn ? tr("controls.cameraOff") : tr("controls.cameraOn")}
                   >
-                    📷
+                    <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+                      {isCameraOn ? (
+                        <>
+                          <path d="M23 19a2 2 0 0 1-2 2H3a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h4l2-3h6l2 3h4a2 2 0 0 1 2 2z" />
+                          <circle cx="12" cy="13" r="4" />
+                        </>
+                      ) : (
+                        <>
+                          <path d="M16 16v1a2 2 0 0 1-2 2H3a2 2 0 0 1-2-2V7a2 2 0 0 1 2-2h2m5.66 0H14a2 2 0 0 1 2 2v3.34l1 1L23 7v10" />
+                          <line x1="1" y1="1" x2="23" y2="23" />
+                        </>
+                      )}
+                    </svg>
                   </button>
                   <button
-                    className={`btn btn--ctrl ${isMicOn ? "btn--ctrl-on" : "btn--ctrl-off"} ${isSpeaking ? "btn--speaking" : ""}`}
+                    className={`btn-ctrl-round ${isMicOn ? "btn-ctrl-round--on" : "btn-ctrl-round--off"} ${isSpeaking ? "btn-ctrl-round--speaking" : ""}`}
                     onClick={toggleMic}
                     title={isMicOn ? tr("controls.micOff") : tr("controls.micOn")}
                   >
-                    🎤
+                    <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+                      {isMicOn ? (
+                        <>
+                          <path d="M12 1a3 3 0 0 0-3 3v8a3 3 0 0 0 6 0V4a3 3 0 0 0-3-3z" />
+                          <path d="M19 10v2a7 7 0 0 1-14 0v-2" />
+                          <line x1="12" y1="19" x2="12" y2="23" />
+                          <line x1="8" y1="23" x2="16" y2="23" />
+                        </>
+                      ) : (
+                        <>
+                          <line x1="1" y1="1" x2="23" y2="23" />
+                          <path d="M9 9v3a3 3 0 0 0 5.12 2.12M15 9.34V4a3 3 0 0 0-5.94-.6" />
+                          <path d="M17 16.95A7 7 0 0 1 5 12v-2m14 0v2c0 .76-.12 1.49-.34 2.17" />
+                          <line x1="12" y1="19" x2="12" y2="23" />
+                          <line x1="8" y1="23" x2="16" y2="23" />
+                        </>
+                      )}
+                    </svg>
                   </button>
-                  {/* 识别画面按钮 */}
                   <button
-                    className="btn--recognize"
+                    className="btn-ctrl-pill btn-ctrl-pill--recognize"
                     onClick={handleRecognize}
                     disabled={isProcessing}
                   >
-                    🔍 {tr("controls.recognize")}
+                    <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+                      <circle cx="11" cy="11" r="8" />
+                      <line x1="21" y1="21" x2="16.65" y2="16.65" />
+                    </svg>
+                    {tr("controls.recognize")}
                   </button>
                   {isProcessing && (
-                    <button className="btn btn--warning" onClick={interrupt}>
+                    <button className="btn-ctrl-pill btn-ctrl-pill--interrupt" onClick={interrupt}>
                       {tr("controls.interrupt")}
                     </button>
                   )}
-                  <button className="btn btn--danger" onClick={stopVideo}>
+                  <button className="btn-ctrl-pill btn-ctrl-pill--stop" onClick={stopVideo}>
+                    <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+                      <rect x="6" y="6" width="12" height="12" rx="2" />
+                    </svg>
                     {tr("controls.stopVideo")}
                   </button>
                 </div>
@@ -502,18 +558,6 @@ function AppContent() {
           <div className="chat-panel-header">
             <span>{tr("chat.title")}</span>
             <div className="chat-panel-header__right">
-              <select
-                className="scenario-selector"
-                value={activeScenario.id}
-                onChange={(e) => handleSelectScenario(e.target.value)}
-                title={tr("settings.scenario")}
-              >
-                {allScenarios.map((sc) => (
-                  <option key={sc.id} value={sc.id}>
-                    {sc.icon} {sc.nameKey ? tr(sc.nameKey) : sc.name}
-                  </option>
-                ))}
-              </select>
               {isConnected && stats.queryCount > 0 && (
                 <span className="chat-panel-header__stats">
                   {stats.queryCount} {tr("statusbar.recognitions")}
diff --git a/frontend/src/components/ChatPanel/index.tsx b/frontend/src/components/ChatPanel/index.tsx
index a0e2d8c..d213195 100644
--- a/frontend/src/components/ChatPanel/index.tsx
+++ b/frontend/src/components/ChatPanel/index.tsx
@@ -121,34 +121,14 @@ export function ChatPanel({
           </div>
         )}
 
-        {/* 空状态：情景选择 + 场景卡片 */}
+        {/* 空状态：欢迎信息 */}
         {isEmpty && (
           <div className="chat-panel__welcome">
             <span className="chat-panel__welcome-icon">{scenarios.find(s => s.id === activeScenario)?.icon || "💬"}</span>
             <p>{isConnected ? t("chat.welcome.prompt") : t("chat.empty.prompt")}</p>
             <span className="chat-panel__welcome-hint">{isConnected ? t("chat.welcome.hint") : t("chat.empty.hint")}</span>
 
-            {/* 情景选择卡片（非 free_chat 时隐藏，因为已通过 header 切换） */}
-            {isFreeChat && onSelectScenario && (
-              <div className="scenario-cards">
-                <div className="scenario-cards__title">{t("scenario.choose")}</div>
-                {scenarios.filter(s => s.id !== "free_chat").map((sc) => (
-                  <button
-                    key={sc.id}
-                    className="scenario-card"
-                    onClick={() => onSelectScenario(sc.id)}
-                  >
-                    <span className="scenario-card__icon">{sc.icon}</span>
-                    <div className="scenario-card__text">
-                      <span className="scenario-card__title">{t(sc.nameKey)}</span>
-                      <span className="scenario-card__desc">{t(sc.descKey)}</span>
-                    </div>
-                  </button>
-                ))}
-              </div>
-            )}
-
-            {/* 视觉分析快捷卡片（仅 free_chat 模式） */}
+            {/* 视觉分析快捷卡片（仅 free_chat 模式 + 已连接） */}
             {isFreeChat && isConnected && (
               <div className="scene-cards">
                 {sceneCards.map((card) => (