Enhance Step5Interaction component with professional design updates and improved UI elements

- Updated the action bar to a more professional design with enhanced layout and styling.
- Introduced new utility classes for better typography and spacing.
- Improved button styles for clarity and consistency, including updated labels for interaction buttons.
- Enhanced dropdown menu design for better usability and visual appeal.
- Adjusted CSS properties for improved responsiveness and overall user experience.

frontend/src/components/Step5Interaction.vue

@@ -77,35 +77,40 @@
 
       <!-- RIGHT PANEL: Interaction Interface -->
       <div class="right-panel" ref="rightPanel">
-        <!-- Unified Action Bar -->
+        <!-- Unified Action Bar - Professional Design -->
         <div class="action-bar">
-          <div class="action-bar-left">
+          <div class="action-bar-header">
+            <span class="action-bar-title">Interactive Tools</span>
+            <span class="action-bar-subtitle mono">{{ profiles.length }} agents available</span>
+          </div>
+          <div class="action-bar-tabs">
             <button 
-              class="action-btn"
+              class="tab-pill"
               :class="{ active: activeTab === 'chat' && chatTarget === 'report_agent' }"
               @click="selectReportAgentChat"
             >
-              <svg viewBox="0 0 24 24" width="16" height="16" fill="none" stroke="currentColor" stroke-width="2">
+              <svg viewBox="0 0 24 24" width="14" height="14" fill="none" stroke="currentColor" stroke-width="2">
                 <path d="M14.7 6.3a1 1 0 0 0 0 1.4l1.6 1.6a1 1 0 0 0 1.4 0l3.77-3.77a6 6 0 0 1-7.94 7.94l-6.91 6.91a2.12 2.12 0 0 1-3-3l6.91-6.91a6 6 0 0 1 7.94-7.94l-3.76 3.76z"></path>
               </svg>
-              <span>与Report Agent对话</span>
+              <span>Report Agent</span>
             </button>
             <div class="agent-dropdown" v-if="profiles.length > 0">
               <button 
-                class="action-btn agent-option"
+                class="tab-pill agent-pill"
                 :class="{ active: activeTab === 'chat' && chatTarget === 'agent' }"
                 @click="toggleAgentDropdown"
               >
-                <svg viewBox="0 0 24 24" width="16" height="16" fill="none" stroke="currentColor" stroke-width="2">
+                <svg viewBox="0 0 24 24" width="14" height="14" fill="none" stroke="currentColor" stroke-width="2">
                   <path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"></path>
                   <circle cx="12" cy="7" r="4"></circle>
                 </svg>
-                <span>{{ selectedAgent ? `与${selectedAgent.username}对话` : '与世界中的任意个体对话' }}</span>
+                <span>{{ selectedAgent ? selectedAgent.username : 'Select Agent' }}</span>
-                <svg class="dropdown-arrow" :class="{ open: showAgentDropdown }" viewBox="0 0 24 24" width="14" height="14" fill="none" stroke="currentColor" stroke-width="2">
+                <svg class="dropdown-arrow" :class="{ open: showAgentDropdown }" viewBox="0 0 24 24" width="12" height="12" fill="none" stroke="currentColor" stroke-width="2">
                   <polyline points="6 9 12 15 18 9"></polyline>
                 </svg>
               </button>
               <div v-if="showAgentDropdown" class="dropdown-menu">
+                <div class="dropdown-header">选择对话对象</div>
                 <div 
                   v-for="(agent, idx) in profiles" 
                   :key="idx"
@@ -120,18 +125,17 @@
                 </div>
               </div>
             </div>
-          </div>
+            <div class="tab-divider"></div>
-          <div class="action-bar-right">
             <button 
-              class="action-btn survey-btn"
+              class="tab-pill survey-pill"
               :class="{ active: activeTab === 'survey' }"
               @click="activeTab = 'survey'"
             >
-              <svg viewBox="0 0 24 24" width="16" height="16" fill="none" stroke="currentColor" stroke-width="2">
+              <svg viewBox="0 0 24 24" width="14" height="14" fill="none" stroke="currentColor" stroke-width="2">
                 <path d="M9 11l3 3L22 4"></path>
                 <path d="M21 12v7a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h11"></path>
               </svg>
-              <span>在世界中发放问卷</span>
+              <span>Survey</span>
             </button>
           </div>
         </div>
@@ -754,6 +758,11 @@ watch(() => props.simulationId, (newId) => {
   overflow: hidden;
 }
 
+/* Utility Classes */
+.mono {
+  font-family: 'JetBrains Mono', 'SF Mono', 'Monaco', 'Consolas', monospace;
+}
+
 /* Main Split Layout */
 .main-split-layout {
   flex: 1;
@@ -1089,74 +1098,110 @@ watch(() => props.simulationId, (newId) => {
   overflow: hidden;
 }
 
-/* Action Bar */
+/* Action Bar - Professional Design */
 .action-bar {
   display: flex;
   align-items: center;
   justify-content: space-between;
-  padding: 12px 20px;
+  padding: 14px 20px;
   border-bottom: 1px solid #E5E7EB;
-  background: #FAFAFA;
+  background: linear-gradient(180deg, #FFFFFF 0%, #FAFBFC 100%);
-  gap: 12px;
+  gap: 16px;
 }
 
-.action-bar-left {
+.action-bar-header {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+  min-width: 140px;
+}
+
+.action-bar-title {
+  font-size: 13px;
+  font-weight: 600;
+  color: #1F2937;
+  letter-spacing: -0.01em;
+}
+
+.action-bar-subtitle {
+  font-size: 11px;
+  color: #9CA3AF;
+}
+
+.action-bar-subtitle.mono {
+  font-family: 'JetBrains Mono', 'SF Mono', monospace;
+}
+
+.action-bar-tabs {
   display: flex;
   align-items: center;
-  gap: 8px;
+  gap: 6px;
+  flex: 1;
+  justify-content: flex-end;
 }
 
-.action-bar-right {
+.tab-pill {
-  display: flex;
-  align-items: center;
-}
-
-.action-btn {
   display: flex;
   align-items: center;
   gap: 6px;
   padding: 8px 14px;
-  font-size: 13px;
+  font-size: 12px;
   font-weight: 500;
-  color: #4B5563;
+  color: #6B7280;
-  background: #FFFFFF;
+  background: #F3F4F6;
-  border: 1px solid #E5E7EB;
+  border: 1px solid transparent;
-  border-radius: 6px;
+  border-radius: 20px;
   cursor: pointer;
   transition: all 0.2s ease;
   white-space: nowrap;
 }
 
-.action-btn:hover {
+.tab-pill:hover {
-  background: #F9FAFB;
+  background: #E5E7EB;
-  border-color: #D1D5DB;
+  color: #374151;
 }
 
-.action-btn.active {
+.tab-pill.active {
   background: #1F2937;
   color: #FFFFFF;
-  border-color: #1F2937;
+  box-shadow: 0 2px 8px rgba(31, 41, 55, 0.15);
 }
 
-.action-btn svg {
+.tab-pill svg {
   flex-shrink: 0;
+  opacity: 0.7;
 }
 
-.survey-btn {
+.tab-pill.active svg {
-  background: #F0FDF4;
+  opacity: 1;
-  border-color: #86EFAC;
-  color: #166534;
 }
 
-.survey-btn:hover {
+.tab-divider {
-  background: #DCFCE7;
+  width: 1px;
-  border-color: #4ADE80;
+  height: 24px;
+  background: #E5E7EB;
+  margin: 0 6px;
 }
 
-.survey-btn.active {
+.agent-pill {
-  background: #166534;
+  min-width: 120px;
+  justify-content: space-between;
+}
+
+.survey-pill {
+  background: #ECFDF5;
+  color: #047857;
+}
+
+.survey-pill:hover {
+  background: #D1FAE5;
+  color: #065F46;
+}
+
+.survey-pill.active {
+  background: #047857;
   color: #FFFFFF;
-  border-color: #166534;
+  box-shadow: 0 2px 8px rgba(4, 120, 87, 0.2);
 }
 
 /* Interaction Header */
@@ -1379,14 +1424,10 @@ watch(() => props.simulationId, (newId) => {
   position: relative;
 }
 
-.agent-option {
-  min-width: 180px;
-  justify-content: flex-start;
-}
-
 .dropdown-arrow {
-  margin-left: auto;
+  margin-left: 4px;
   transition: transform 0.2s ease;
+  opacity: 0.6;
 }
 
 .dropdown-arrow.open {
@@ -1395,30 +1436,50 @@ watch(() => props.simulationId, (newId) => {
 
 .dropdown-menu {
   position: absolute;
-  top: 100%;
+  top: calc(100% + 6px);
-  left: 0;
+  left: 50%;
-  right: 0;
+  transform: translateX(-50%);
-  margin-top: 4px;
+  min-width: 240px;
   background: #FFFFFF;
   border: 1px solid #E5E7EB;
-  border-radius: 8px;
+  border-radius: 12px;
-  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
+  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12), 0 4px 12px rgba(0, 0, 0, 0.06);
-  max-height: 300px;
+  max-height: 320px;
   overflow-y: auto;
   z-index: 100;
 }
 
+.dropdown-header {
+  padding: 12px 16px 8px;
+  font-size: 11px;
+  font-weight: 600;
+  color: #9CA3AF;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  border-bottom: 1px solid #F3F4F6;
+}
+
 .dropdown-item {
   display: flex;
   align-items: center;
   gap: 12px;
-  padding: 12px 16px;
+  padding: 10px 16px;
   cursor: pointer;
-  transition: background 0.15s ease;
+  transition: all 0.15s ease;
+  border-left: 3px solid transparent;
 }
 
 .dropdown-item:hover {
   background: #F9FAFB;
+  border-left-color: #1F2937;
+}
+
+.dropdown-item:first-of-type {
+  margin-top: 4px;
+}
+
+.dropdown-item:last-child {
+  margin-bottom: 4px;
 }
 
 .agent-avatar {
@@ -1426,32 +1487,41 @@ watch(() => props.simulationId, (newId) => {
   height: 32px;
   min-width: 32px;
   min-height: 32px;
-  background: #1F2937;
+  background: linear-gradient(135deg, #1F2937 0%, #374151 100%);
   color: #FFFFFF;
   border-radius: 50%;
   display: flex;
   align-items: center;
   justify-content: center;
-  font-size: 13px;
+  font-size: 12px;
   font-weight: 600;
   flex-shrink: 0;
+  box-shadow: 0 2px 4px rgba(31, 41, 55, 0.1);
 }
 
 .agent-info {
   display: flex;
   flex-direction: column;
   gap: 2px;
+  flex: 1;
+  min-width: 0;
 }
 
 .agent-name {
   font-size: 13px;
   font-weight: 600;
   color: #1F2937;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
 }
 
 .agent-role {
   font-size: 11px;
   color: #9CA3AF;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
 }
 
 /* Chat Messages */