diff --git a/frontend/src/components/Step2EnvSetup.vue b/frontend/src/components/Step2EnvSetup.vue
index 6cc025c..bf5c10b 100644
--- a/frontend/src/components/Step2EnvSetup.vue
+++ b/frontend/src/components/Step2EnvSetup.vue
@@ -436,47 +436,76 @@
           
           <!-- 模拟轮数配置 -->
           <div class="rounds-config-section">
-            <div class="rounds-notice">
-              <div class="notice-icon">⏱️</div>
-              <div class="notice-content">
-                <p class="notice-main">系统自动配置的模拟轮数为 <strong>{{ autoGeneratedRounds }} 轮</strong>，每轮代表现实中 <strong>1 小时</strong>的时间流逝。</p>
-                <p class="notice-sub">完整模拟耗时较长，建议将轮数设置为 <strong>50 轮</strong>（预计耗时约 30 分钟）以快速预览效果。</p>
+            <div class="rounds-header">
+              <div class="header-left">
+                <span class="section-title">模拟轮数设定</span>
+                <span class="section-desc">MiroFish 自动规划推演现实 <span class="desc-highlight">{{ simulationConfig?.time_config?.total_simulation_hours || '-' }}</span> 小时，每轮代表现实 <span class="desc-highlight">{{ simulationConfig?.time_config?.minutes_per_round || '-' }}</span> 分钟时间流逝</span>
               </div>
+              <label class="switch-control">
+                <input type="checkbox" v-model="useCustomRounds">
+                <span class="switch-track"></span>
+                <span class="switch-label">自定义</span>
+              </label>
             </div>
             
-            <div class="rounds-control">
-              <label class="custom-checkbox">
-                <input type="checkbox" v-model="useCustomRounds" />
-                <span class="checkmark"></span>
-                <span class="checkbox-label">自定义模拟轮数 <span class="recommend-badge">推荐</span></span>
-              </label>
-              
-              <div v-if="useCustomRounds" class="slider-container">
-                <div class="slider-header">
-                  <span class="slider-label">模拟轮数</span>
-                  <span class="slider-value">{{ customMaxRounds }} 轮</span>
+            <Transition name="fade" mode="out-in">
+              <div v-if="useCustomRounds" class="rounds-content custom" key="custom">
+                <div class="slider-display">
+                  <div class="slider-main-value">
+                    <span class="val-num">{{ customMaxRounds }}</span>
+                    <span class="val-unit">轮</span>
+                  </div>
+                  <div class="slider-meta-info">
+                    <span>预计耗时约 {{ Math.round(customMaxRounds * 0.6) }} 分钟</span>
+                  </div>
                 </div>
-                <input 
-                  type="range" 
-                  v-model.number="customMaxRounds" 
-                  min="10" 
-                  max="120" 
-                  step="5"
-                  class="rounds-slider"
-                />
-                <div class="slider-marks">
-                  <span>10</span>
-                  <span class="mark-recommend">50 (推荐)</span>
-                  <span>120</span>
+
+                <div class="range-wrapper">
+                  <input 
+                    type="range" 
+                    v-model.number="customMaxRounds" 
+                    min="10" 
+                    max="120" 
+                    step="5"
+                    class="minimal-slider"
+                    :style="{ '--percent': ((customMaxRounds - 10) / (120 - 10)) * 100 + '%' }"
+                  />
+                  <div class="range-marks">
+                    <span>10</span>
+                    <span 
+                      class="mark-recommend" 
+                      :class="{ active: customMaxRounds === 40 }"
+                      @click="customMaxRounds = 40"
+                      :style="{ position: 'absolute', left: 'calc(27.27% - 30px)' }"
+                    >40 (推荐)</span>
+                    <span>120</span>
+                  </div>
                 </div>
-                <p class="slider-estimate">预计耗时：约 {{ Math.round(customMaxRounds * 0.6) }} 分钟</p>
               </div>
               
-              <div v-else class="auto-mode-hint">
-                <span class="hint-icon">ℹ️</span>
-                <span>将使用自动配置的 {{ autoGeneratedRounds }} 轮完整模拟</span>
+              <div v-else class="rounds-content auto" key="auto">
+                <div class="auto-info-card">
+                  <div class="auto-value">
+                    <span class="val-num">{{ autoGeneratedRounds }}</span>
+                    <span class="val-unit">轮</span>
+                  </div>
+                  <div class="auto-content">
+                    <div class="auto-meta-row">
+                      <span class="duration-badge">
+                        <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                          <circle cx="12" cy="12" r="10"></circle>
+                          <polyline points="12 6 12 12 16 14"></polyline>
+                        </svg>
+                        预计耗时 {{ Math.round(autoGeneratedRounds * 0.6) }} 分钟
+                      </span>
+                    </div>
+                    <div class="auto-desc">
+                      <p class="highlight-tip" @click="useCustomRounds = true">若首次运行，强烈建议切换至‘自定义模式’减少模拟轮数，以便快速预览效果并降低报错风险 ➝</p>
+                    </div>
+                  </div>
+                </div>
               </div>
-            </div>
+            </Transition>
           </div>
 
           <div class="action-group dual">
@@ -634,8 +663,8 @@ const selectedProfile = ref(null)
 const showProfilesDetail = ref(true)
 
 // 模拟轮数配置
-const useCustomRounds = ref(true) // 默认使用自定义轮数（推荐）
-const customMaxRounds = ref(50)   // 默认推荐50轮
+const useCustomRounds = ref(false) // 默认使用自动配置轮数
+const customMaxRounds = ref(40)   // 默认推荐40轮
 const autoGeneratedRounds = ref(120) // 自动生成的轮数（从配置中读取）
 
 // Watch stage to update phase
@@ -2155,220 +2184,305 @@ onUnmounted(() => {
 
 /* 模拟轮数配置样式 */
 .rounds-config-section {
-  margin: 20px 0;
-  padding: 16px;
-  background: #FAFAFA;
-  border-radius: 8px;
-  border: 1px solid #E5E5E5;
+  margin: 24px 0;
+  padding-top: 24px;
+  border-top: 1px solid #EAEAEA;
 }
 
-.rounds-notice {
-  display: flex;
-  gap: 12px;
-  align-items: flex-start;
-  padding: 14px;
-  background: #FFF8E1;
-  border-radius: 6px;
-  border-left: 3px solid #FFC107;
-  margin-bottom: 16px;
-}
-
-.notice-icon {
-  font-size: 20px;
-  line-height: 1;
-}
-
-.notice-content {
-  flex: 1;
-}
-
-.notice-main {
-  font-size: 13px;
-  color: #333;
-  line-height: 1.6;
-  margin: 0 0 6px 0;
-}
-
-.notice-main strong {
-  color: #E65100;
-}
-
-.notice-sub {
-  font-size: 12px;
-  color: #666;
-  line-height: 1.5;
-  margin: 0;
-}
-
-.notice-sub strong {
-  color: #2E7D32;
-}
-
-.rounds-control {
-  padding: 0 4px;
-}
-
-.custom-checkbox {
-  display: flex;
-  align-items: center;
-  cursor: pointer;
-  user-select: none;
-  gap: 10px;
-}
-
-.custom-checkbox input[type="checkbox"] {
-  display: none;
-}
-
-.checkmark {
-  width: 18px;
-  height: 18px;
-  border: 2px solid #CCC;
-  border-radius: 4px;
-  position: relative;
-  transition: all 0.2s;
-  flex-shrink: 0;
-}
-
-.custom-checkbox input:checked + .checkmark {
-  background: #FF5722;
-  border-color: #FF5722;
-}
-
-.custom-checkbox input:checked + .checkmark::after {
-  content: '';
-  position: absolute;
-  left: 5px;
-  top: 2px;
-  width: 5px;
-  height: 9px;
-  border: solid white;
-  border-width: 0 2px 2px 0;
-  transform: rotate(45deg);
-}
-
-.checkbox-label {
-  font-size: 13px;
-  font-weight: 500;
-  color: #333;
-  display: flex;
-  align-items: center;
-  gap: 8px;
-}
-
-.recommend-badge {
-  font-size: 10px;
-  font-weight: 600;
-  color: #FFF;
-  background: #4CAF50;
-  padding: 2px 6px;
-  border-radius: 3px;
-  text-transform: uppercase;
-}
-
-.slider-container {
-  margin-top: 16px;
-  padding: 16px;
-  background: #FFF;
-  border-radius: 6px;
-  border: 1px solid #E5E5E5;
-}
-
-.slider-header {
+.rounds-header {
   display: flex;
   justify-content: space-between;
   align-items: center;
-  margin-bottom: 12px;
+  margin-bottom: 20px;
 }
 
-.slider-label {
+.header-left {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+}
+
+.section-title {
+  font-size: 14px;
+  font-weight: 600;
+  color: #1E293B;
+}
+
+.section-desc {
+  font-size: 12px;
+  color: #94A3B8;
+}
+
+.desc-highlight {
+  font-family: 'JetBrains Mono', monospace;
+  font-weight: 600;
+  color: #1E293B;
+  background: #F1F5F9;
+  padding: 1px 6px;
+  border-radius: 4px;
+  margin: 0 2px;
+}
+
+/* Switch Control */
+.switch-control {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  cursor: pointer;
+  padding: 4px 8px 4px 4px;
+  border-radius: 20px;
+  transition: background 0.2s;
+}
+
+.switch-control:hover {
+  background: #F8FAFC;
+}
+
+.switch-control input {
+  display: none;
+}
+
+.switch-track {
+  width: 36px;
+  height: 20px;
+  background: #E2E8F0;
+  border-radius: 10px;
+  position: relative;
+  transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
+}
+
+.switch-track::after {
+  content: '';
+  position: absolute;
+  left: 2px;
+  top: 2px;
+  width: 16px;
+  height: 16px;
+  background: #FFF;
+  border-radius: 50%;
+  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
+  transition: transform 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
+}
+
+.switch-control input:checked + .switch-track {
+  background: #000;
+}
+
+.switch-control input:checked + .switch-track::after {
+  transform: translateX(16px);
+}
+
+.switch-label {
+  font-size: 12px;
+  font-weight: 500;
+  color: #64748B;
+}
+
+.switch-control input:checked ~ .switch-label {
+  color: #1E293B;
+}
+
+/* Slider Content */
+.rounds-content {
+  animation: fadeIn 0.3s ease;
+}
+
+.slider-display {
+  display: flex;
+  justify-content: space-between;
+  align-items: flex-end;
+  margin-bottom: 16px;
+}
+
+.slider-main-value {
+  display: flex;
+  align-items: baseline;
+  gap: 4px;
+}
+
+.val-num {
+  font-family: 'JetBrains Mono', monospace;
+  font-size: 24px;
+  font-weight: 700;
+  color: #000;
+}
+
+.val-unit {
   font-size: 12px;
   color: #666;
   font-weight: 500;
 }
 
-.slider-value {
+.slider-meta-info {
   font-family: 'JetBrains Mono', monospace;
-  font-size: 16px;
-  font-weight: 700;
-  color: #FF5722;
+  font-size: 11px;
+  color: #64748B;
+  background: #F1F5F9;
+  padding: 4px 8px;
+  border-radius: 4px;
 }
 
-.rounds-slider {
+.range-wrapper {
+  position: relative;
+  padding: 0 2px;
+}
+
+.minimal-slider {
+  -webkit-appearance: none;
   width: 100%;
-  height: 6px;
-  -webkit-appearance: none;
-  appearance: none;
-  background: linear-gradient(to right, #E0E0E0, #E0E0E0);
-  border-radius: 3px;
+  height: 4px;
+  background: #E2E8F0;
+  border-radius: 2px;
   outline: none;
+  background-image: linear-gradient(#000, #000);
+  background-size: var(--percent, 0%) 100%;
+  background-repeat: no-repeat;
   cursor: pointer;
 }
 
-.rounds-slider::-webkit-slider-thumb {
+.minimal-slider::-webkit-slider-thumb {
   -webkit-appearance: none;
-  appearance: none;
-  width: 20px;
-  height: 20px;
-  background: #FF5722;
+  width: 16px;
+  height: 16px;
   border-radius: 50%;
+  background: #FFF;
+  border: 2px solid #000;
   cursor: pointer;
-  box-shadow: 0 2px 6px rgba(255, 87, 34, 0.3);
-  transition: transform 0.2s;
+  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
+  transition: transform 0.1s;
+  margin-top: -6px; /* Center thumb */
 }
 
-.rounds-slider::-webkit-slider-thumb:hover {
+.minimal-slider::-webkit-slider-thumb:hover {
   transform: scale(1.1);
 }
 
-.rounds-slider::-moz-range-thumb {
-  width: 20px;
-  height: 20px;
-  background: #FF5722;
-  border: none;
-  border-radius: 50%;
-  cursor: pointer;
-  box-shadow: 0 2px 6px rgba(255, 87, 34, 0.3);
+.minimal-slider::-webkit-slider-runnable-track {
+  height: 4px;
+  border-radius: 2px;
 }
 
-.slider-marks {
+.range-marks {
   display: flex;
   justify-content: space-between;
   margin-top: 8px;
   font-family: 'JetBrains Mono', monospace;
   font-size: 10px;
-  color: #999;
+  color: #94A3B8;
+  position: relative;
 }
 
 .mark-recommend {
-  color: #4CAF50;
+  cursor: pointer;
+  transition: color 0.2s;
+  position: relative;
+}
+
+.mark-recommend:hover {
+  color: #000;
+}
+
+.mark-recommend.active {
+  color: #000;
   font-weight: 600;
 }
 
-.slider-estimate {
-  margin: 12px 0 0 0;
-  font-size: 12px;
-  color: #666;
-  text-align: center;
-  padding: 8px;
-  background: #F5F5F5;
-  border-radius: 4px;
+.mark-recommend::after {
+  content: '';
+  position: absolute;
+  top: -12px;
+  left: 50%;
+  transform: translateX(-50%);
+  width: 1px;
+  height: 4px;
+  background: #CBD5E1;
 }
 
-.auto-mode-hint {
-  margin-top: 12px;
-  padding: 12px;
-  background: #F5F5F5;
-  border-radius: 6px;
+/* Auto Info */
+.auto-info-card {
   display: flex;
   align-items: center;
-  gap: 8px;
-  font-size: 12px;
-  color: #666;
+  gap: 24px;
+  background: #F8FAFC;
+  padding: 16px 20px;
+  border-radius: 8px;
 }
 
-.hint-icon {
-  font-size: 14px;
+.auto-value {
+  display: flex;
+  flex-direction: row;
+  align-items: baseline;
+  gap: 4px;
+  padding-right: 24px;
+  border-right: 1px solid #E2E8F0;
+}
+
+.auto-content {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+  justify-content: center;
+}
+
+.auto-meta-row {
+  display: flex;
+  align-items: center;
+}
+
+.duration-badge {
+  display: inline-flex;
+  align-items: center;
+  gap: 5px;
+  font-family: 'JetBrains Mono', monospace;
+  font-size: 11px;
+  font-weight: 500;
+  color: #64748B;
+  background: #FFFFFF;
+  border: 1px solid #E2E8F0;
+  padding: 3px 8px;
+  border-radius: 6px;
+  box-shadow: 0 1px 2px rgba(0,0,0,0.02);
+}
+
+.auto-desc {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+}
+
+.auto-desc p {
+  margin: 0;
+  font-size: 13px;
+  color: #64748B;
+  line-height: 1.5;
+}
+
+.highlight-tip {
+  margin-top: 4px !important;
+  font-size: 12px !important;
+  color: #000 !important;
+  font-weight: 500;
+  cursor: pointer;
+}
+
+.highlight-tip:hover {
+  text-decoration: underline;
+}
+
+@keyframes fadeIn {
+  from { opacity: 0; transform: translateY(4px); }
+  to { opacity: 1; transform: translateY(0); }
+}
+
+.fade-enter-active,
+.fade-leave-active {
+  transition: opacity 0.2s ease;
+}
+
+.fade-enter-from,
+.fade-leave-to {
+  opacity: 0;
 }
 
 /* Modal Transition */