diff --git a/src/App.vue b/src/App.vue
index a045ba9..031025a 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -6,7 +6,7 @@
         <img :src="iconTitle" alt="星程桑基图" class="title-logo" />
       </div>
 
-        <div class="toolbar">
+      <div class="toolbar">
         <div ref="themeTriggerRef" class="tool-item theme-trigger">
           <span class="tool-label">选择主题</span>
           <button class="icon-btn" type="button" @click.stop="toggleThemePicker">
@@ -23,26 +23,32 @@
             <div class="theme-header">选择配色主题</div>
             <div class="theme-wheel-wrap">
               <div ref="themeWheelRef" class="theme-wheel" @scroll="onThemeWheelScroll">
-              <button
+                <button
                   v-for="(theme, index) in themes"
-                :key="theme.id"
-                class="theme-row"
+                  :key="theme.id"
+                  class="theme-row"
                   :class="{ selected: selectedThemeId === theme.id }"
                   :style="{ opacity: getThemeRowOpacity(index) }"
-                type="button"
-                @click="pickTheme(theme.id)"
-              >
-                  <img :src="selectedThemeId === theme.id ? iconRadioOn : iconRadioOff" alt="主题选择" />
-                <div class="palette" :style="{ gridTemplateColumns: `repeat(${theme.colors.length}, 1fr)` }">
-                  <span
-                    v-for="color in theme.colors"
-                    :key="`${theme.id}-${color}`"
-                    class="palette-cell"
-                    :style="{ backgroundColor: color }"
+                  type="button"
+                  @click="pickTheme(theme.id)"
+                >
+                  <img
+                    :src="selectedThemeId === theme.id ? iconRadioOn : iconRadioOff"
+                    alt="主题选择"
                   />
-                </div>
-              </button>
-            </div>
+                  <div
+                    class="palette"
+                    :style="{ gridTemplateColumns: `repeat(${theme.colors.length}, 1fr)` }"
+                  >
+                    <span
+                      v-for="color in theme.colors"
+                      :key="`${theme.id}-${color}`"
+                      class="palette-cell"
+                      :style="{ backgroundColor: color }"
+                    />
+                  </div>
+                </button>
+              </div>
               <div class="theme-mask" />
             </div>
           </div>
@@ -82,7 +88,6 @@
           </button>
         </div>
       </div>
-
     </header>
 
     <main class="content">
@@ -109,7 +114,11 @@
                 >
                   <img :src="iconData" alt="数据列" class="column-icon" />
                   <span class="column-label">{{ header }}</span>
-                  <button class="select-btn" type="button" @click="mapping.sourceDataColumn = index">
+                  <button
+                    class="select-btn"
+                    type="button"
+                    @click="mapping.sourceDataColumn = index"
+                  >
                     <img
                       :src="mapping.sourceDataColumn === index ? iconRadioOn : iconRadioOff"
                       alt="单选"
@@ -142,7 +151,9 @@
                   <button class="select-btn" type="button" @click="toggleSourceDescription(index)">
                     <img
                       :src="
-                        mapping.sourceDescriptionColumns.includes(index) ? iconCheckboxOn : iconCheckboxOff
+                        mapping.sourceDescriptionColumns.includes(index)
+                          ? iconCheckboxOn
+                          : iconCheckboxOff
                       "
                       alt="复选"
                     />
@@ -153,7 +164,7 @@
           </div>
         </article>
 
-        <article class="panel block-panel">
+        <article class="panel block-panel target-panel">
           <h2>目标数据</h2>
           <div class="field-block">
             <button class="field-title-wrap" type="button" @click="toggleSection('targetDesc')">
@@ -177,12 +188,25 @@
                   <button class="select-btn" type="button" @click="toggleTargetDescription(index)">
                     <img
                       :src="
-                        mapping.targetDescriptionColumns.includes(index) ? iconCheckboxOn : iconCheckboxOff
+                        mapping.targetDescriptionColumns.includes(index)
+                          ? iconCheckboxOn
+                          : iconCheckboxOff
                       "
                       alt="复选"
                     />
                   </button>
                 </div>
+                <div class="column-row total-row">
+                  <img :src="iconDescription" alt="总和" class="column-icon" />
+                  <span class="column-label">总和</span>
+                  <button
+                    class="select-btn"
+                    type="button"
+                    @click="targetShowTotal = !targetShowTotal"
+                  >
+                    <img :src="targetShowTotal ? iconCheckboxOn : iconCheckboxOff" alt="复选" />
+                  </button>
+                </div>
               </div>
             </template>
           </div>
@@ -194,43 +218,47 @@
           <h2>桑基图预览</h2>
 
           <div class="preview-controls">
-            <label>
-              方向
-              <select v-model="direction">
-                <option value="source-to-target">source -&gt; target</option>
-                <option value="target-to-source">target -&gt; source</option>
-              </select>
-            </label>
             <label class="slider-label">
-              间距
+              <img :src="iconGap" alt="间距" class="slider-icon" />
               <div class="slider-track-wrap">
-                <span class="slider-value" :style="getSliderValueStyle(nodeGap, 8, 42)">{{ nodeGap }}</span>
+                <span class="slider-value" :style="getSliderValueStyle(nodeGap, 0, 30)">{{
+                  nodeGap
+                }}</span>
                 <input
                   v-model.number="nodeGap"
                   class="slider-input"
-                  :style="getSliderTrackStyle(nodeGap, 8, 42)"
+                  :style="getSliderTrackStyle(nodeGap, 0, 30)"
                   type="range"
-                  min="8"
-                  max="42"
+                  min="0"
+                  max="30"
                 />
               </div>
             </label>
             <label class="slider-label">
-              边距
+              <img :src="iconPadding" alt="边距" class="slider-icon" />
               <div class="slider-track-wrap">
-                <span class="slider-value" :style="getSliderValueStyle(chartPadding, 10, 70)">
+                <span class="slider-value" :style="getSliderValueStyle(chartPadding, 0, 80)">
                   {{ chartPadding }}
                 </span>
                 <input
                   v-model.number="chartPadding"
                   class="slider-input"
-                  :style="getSliderTrackStyle(chartPadding, 10, 70)"
+                  :style="getSliderTrackStyle(chartPadding, 0, 80)"
                   type="range"
-                  min="10"
-                  max="70"
+                  min="0"
+                  max="80"
                 />
               </div>
             </label>
+            <button class="direction-control" type="button" @click="toggleDirection">
+              <span class="direction-label">方向</span>
+              <span class="direction-switch" :class="{ on: direction === 'source-to-target' }">
+                <span class="direction-switch-text">
+                  {{ direction === 'source-to-target' ? 'source' : 'target' }}
+                </span>
+                <span class="direction-switch-thumb" />
+              </span>
+            </button>
           </div>
         </div>
 
@@ -253,7 +281,17 @@
 </template>
 
 <script setup lang="ts">
-import { computed, nextTick, onBeforeUnmount, onMounted, reactive, ref, watch, watchEffect, type CSSProperties } from 'vue';
+import {
+  computed,
+  nextTick,
+  onBeforeUnmount,
+  onMounted,
+  reactive,
+  ref,
+  watch,
+  watchEffect,
+  type CSSProperties
+} from 'vue';
 import * as echarts from 'echarts/core';
 import type { EChartsOption } from 'echarts';
 import { SankeyChart } from 'echarts/charts';
@@ -284,6 +322,8 @@ import iconCheckboxOn from '../assets/icons/checkbox.svg';
 import iconCheckboxOff from '../assets/icons/checkbox-no.svg';
 import iconExpand from '../assets/icons/expand.svg';
 import iconZhedie from '../assets/icons/zhedie.svg';
+import iconGap from '../assets/icons/gap.svg';
+import iconPadding from '../assets/icons/padding.svg';
 
 echarts.use([SankeyChart, TooltipComponent, CanvasRenderer]);
 
@@ -309,15 +349,16 @@ const rawTable = ref<RawTable | null>(null);
 const buildResult = ref<SankeyBuildResult | null>(null);
 
 const mapping = reactive<MappingConfig>({
-  sourceDataColumn: 1,
+  sourceDataColumn: 2,
   sourceDescriptionColumns: [0, 1],
   targetDescriptionColumns: [2],
   delimiter: '-'
 });
 
 const direction = ref<'source-to-target' | 'target-to-source'>('source-to-target');
-const nodeGap = ref(24);
-const chartPadding = ref(30);
+const nodeGap = ref(5);
+const chartPadding = ref(24);
+const targetShowTotal = ref(true);
 /**
  * 左侧字段区块的展开/折叠状态。
  * true 表示展开，false 表示折叠。
@@ -344,10 +385,51 @@ const columnHeaders = computed(() => {
   return ['列1', '列2', '列3', '列4'];
 });
 
+/**
+ * 格式化总和数值，统一使用千分位显示。
+ */
+function formatTotalValue(value: number): string {
+  return value.toLocaleString('zh-CN', { maximumFractionDigits: 10 });
+}
+
+/**
+ * 统计每个 target 的汇总值，用于展示“目标管道总和”。
+ */
+const targetTotalValueMap = computed(() => {
+  const result = buildResult.value;
+  const map = new Map<string, number>();
+  if (!result) {
+    return map;
+  }
+
+  result.links.forEach((link) => {
+    map.set(link.target, (map.get(link.target) ?? 0) + link.value);
+  });
+
+  return map;
+});
+
+/**
+ * 将原始 target 名称映射为“target + 总和”显示名。
+ * 例如：男 -> 男 1,200
+ */
+const targetDisplayNameMap = computed(() => {
+  const map = new Map<string, string>();
+  if (!targetShowTotal.value) {
+    return map;
+  }
+
+  targetTotalValueMap.value.forEach((total, targetName) => {
+    map.set(targetName, `${targetName} ${formatTotalValue(total)}`);
+  });
+
+  return map;
+});
+
 const buildWarnings = computed(() => buildResult.value?.meta.warnings.slice(0, 8) ?? []);
 
 const chartNodes = computed(() => {
-  const links = buildResult.value ? applyDirection(buildResult.value.links, direction.value) : [];
+  const links = chartLinks.value;
   const names = new Set<string>();
 
   links.forEach((link) => {
@@ -368,7 +450,13 @@ const chartLinks = computed(() => {
   if (!buildResult.value) {
     return [];
   }
-  return applyDirection(buildResult.value.links, direction.value);
+
+  const linksWithDisplayName = buildResult.value.links.map((link) => ({
+    ...link,
+    target: targetDisplayNameMap.value.get(link.target) ?? link.target
+  }));
+
+  return applyDirection(linksWithDisplayName, direction.value);
 });
 
 const chartOption = computed<EChartsOption>(() => {
@@ -481,22 +569,18 @@ function pickTheme(themeId: string): void {
  * 点击弹窗外部时关闭主题窗口，保持和设计稿一致的关闭行为。
  */
 function handleGlobalPointerDown(event: PointerEvent): void {
-  if (!showThemePicker.value) {
-    return;
-  }
-
   const target = event.target as Node | null;
   if (!target) {
     return;
   }
 
-  const popover = themePopoverRef.value;
-  const trigger = themeTriggerRef.value;
-  if (popover?.contains(target) || trigger?.contains(target)) {
-    return;
+  if (showThemePicker.value) {
+    const popover = themePopoverRef.value;
+    const trigger = themeTriggerRef.value;
+    if (!popover?.contains(target) && !trigger?.contains(target)) {
+      showThemePicker.value = false;
+    }
   }
-
-  showThemePicker.value = false;
 }
 
 /**
@@ -615,11 +699,15 @@ function getSliderTrackStyle(value: number, min: number, max: number): CSSProper
 
 function toggleSourceDescription(column: number): void {
   if (mapping.sourceDescriptionColumns.includes(column)) {
-    mapping.sourceDescriptionColumns = mapping.sourceDescriptionColumns.filter((item) => item !== column);
+    mapping.sourceDescriptionColumns = mapping.sourceDescriptionColumns.filter(
+      (item) => item !== column
+    );
     return;
   }
 
-  mapping.sourceDescriptionColumns = [...mapping.sourceDescriptionColumns, column].sort((a, b) => a - b);
+  mapping.sourceDescriptionColumns = [...mapping.sourceDescriptionColumns, column].sort(
+    (a, b) => a - b
+  );
 }
 
 /**
@@ -631,11 +719,23 @@ function toggleSection(section: keyof typeof sectionVisible): void {
 
 function toggleTargetDescription(column: number): void {
   if (mapping.targetDescriptionColumns.includes(column)) {
-    mapping.targetDescriptionColumns = mapping.targetDescriptionColumns.filter((item) => item !== column);
+    mapping.targetDescriptionColumns = mapping.targetDescriptionColumns.filter(
+      (item) => item !== column
+    );
     return;
   }
 
-  mapping.targetDescriptionColumns = [...mapping.targetDescriptionColumns, column].sort((a, b) => a - b);
+  mapping.targetDescriptionColumns = [...mapping.targetDescriptionColumns, column].sort(
+    (a, b) => a - b
+  );
+}
+
+/**
+ * 方向开关点击一次就在“source->target / target->source”之间切换。
+ */
+function toggleDirection(): void {
+  direction.value =
+    direction.value === 'source-to-target' ? 'target-to-source' : 'source-to-target';
 }
 
 function openFileDialog(): void {
@@ -646,7 +746,7 @@ function setDefaultMappingByColumns(columnSize: number): void {
   const safeSize = Math.max(columnSize, 1);
   const safeColumn = (index: number): number => Math.min(index, safeSize - 1);
 
-  mapping.sourceDataColumn = safeColumn(1);
+  mapping.sourceDataColumn = safeColumn(2);
   mapping.sourceDescriptionColumns = [safeColumn(0), safeColumn(1)].filter(
     (item, index, list) => list.indexOf(item) === index
   );
diff --git a/src/styles.css b/src/styles.css
index 38db517..d638c19 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -299,8 +299,12 @@ body {
   padding: 8px;
 }
 
-.block-panel h2,
-.preview-head h2 {
+.target-panel {
+  flex: 1;
+  min-height: 0;
+}
+
+.block-panel h2 {
   margin: 0;
   font-size: 24px;
   font-weight: 400;
@@ -395,18 +399,22 @@ body {
   text-overflow: ellipsis;
 }
 
+.total-row .column-label {
+  color: var(--text-4);
+}
+
 .select-btn {
   border: 0;
   background: transparent;
   cursor: pointer;
   padding: 0;
-  width: 20px;
-  height: 20px;
+  width: 16px;
+  height: 16px;
 }
 
 .select-btn img {
-  width: 20px;
-  height: 20px;
+  width: 16px;
+  height: 16px;
 }
 
 .preview-panel {
@@ -420,38 +428,46 @@ body {
   justify-content: space-between;
   gap: 12px;
   align-items: center;
-  margin-bottom: 6px;
+  min-height: 60px;
+  margin-bottom: 8px;
+}
+
+.preview-head h2 {
+  margin: 0;
+  width: 223px;
+  font-size: 24px;
+  font-weight: 600;
+  line-height: 1;
 }
 
 .preview-controls {
   display: flex;
   align-items: center;
-  gap: 8px;
-}
-
-.preview-controls label {
-  display: inline-flex;
-  align-items: center;
-  gap: 4px;
-  color: var(--text-4);
-  font-size: 12px;
+  gap: 24px;
 }
 
 .preview-controls .slider-label {
+  display: inline-flex;
   align-items: center;
-  color: #000;
-  font-size: 14px;
+  gap: 6px;
+  width: 148px;
 }
 
 .slider-track-wrap {
   position: relative;
-  width: 130px;
-  height: 18px;
+  width: 122px;
+  height: 24px;
+}
+
+.slider-icon {
+  width: 20px;
+  height: 20px;
+  flex-shrink: 0;
 }
 
 .slider-input {
   width: 100%;
-  height: 18px;
+  height: 24px;
   margin: 0;
   background: transparent;
   -webkit-appearance: none;
@@ -463,10 +479,10 @@ body {
   border-radius: 999px;
   background: linear-gradient(
     to right,
-    #8552a1 0,
-    #8552a1 var(--slider-percent, 0%),
-    #d9d9d9 var(--slider-percent, 0%),
-    #d9d9d9 100%
+    var(--primary-6) 0,
+    var(--primary-6) var(--slider-percent, 0%),
+    var(--fill-3) var(--slider-percent, 0%),
+    var(--fill-3) 100%
   );
 }
 
@@ -476,29 +492,31 @@ body {
   width: 18px;
   height: 18px;
   border-radius: 50%;
-  border: 1px solid #d9d9d9;
+  border: 1px solid var(--fill-3);
   background: #fff;
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
   margin-top: -7px;
 }
 
 .slider-input::-moz-range-track {
   height: 4px;
   border-radius: 999px;
-  background: #d9d9d9;
+  background: var(--fill-3);
 }
 
 .slider-input::-moz-range-thumb {
   width: 18px;
   height: 18px;
   border-radius: 50%;
-  border: 1px solid #d9d9d9;
+  border: 1px solid var(--fill-3);
   background: #fff;
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
 }
 
 .slider-input::-moz-range-progress {
   height: 4px;
   border-radius: 999px;
-  background: #8552a1;
+  background: var(--primary-6);
 }
 
 .slider-value {
@@ -512,8 +530,61 @@ body {
   pointer-events: none;
 }
 
-.preview-controls select {
-  accent-color: var(--primary-7);
+.direction-control {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  border: 0;
+  background: transparent;
+  padding: 0;
+  cursor: pointer;
+}
+
+.direction-label {
+  font-size: 14px;
+  font-weight: 600;
+  color: #000;
+  line-height: 1;
+}
+
+.direction-switch {
+  display: inline-flex;
+  align-items: center;
+  gap: 2px;
+  width: 80px;
+  height: 24px;
+  padding: 2px;
+  border-radius: 999px;
+  background: var(--fill-3);
+  justify-content: space-between;
+}
+
+.direction-switch-text {
+  font-size: 14px;
+  line-height: 1;
+  padding: 0 4px;
+  color: var(--text-4);
+}
+
+.direction-switch-thumb {
+  width: 20px;
+  height: 20px;
+  border-radius: 50%;
+  background: #fff;
+  border: 1px solid var(--fill-3);
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
+}
+
+.direction-switch.on {
+  background: var(--primary-6);
+}
+
+.direction-switch.on .direction-switch-text {
+  color: #fff;
+}
+
+.direction-switch:not(.on) {
+  flex-direction: row-reverse;
 }
 
 .example-line {
@@ -581,6 +652,22 @@ body {
     min-height: 360px;
   }
 
+  .preview-head {
+    min-height: auto;
+    align-items: flex-start;
+    flex-direction: column;
+  }
+
+  .preview-head h2 {
+    width: auto;
+    font-size: 28px;
+  }
+
+  .preview-controls {
+    flex-wrap: wrap;
+    gap: 12px;
+  }
+
   .footer {
     font-size: 14px;
   }
@@ -609,11 +696,14 @@ body {
     min-width: 220px;
   }
 
-  .block-panel h2,
-  .preview-head h2 {
+  .block-panel h2 {
     font-size: 20px;
   }
 
+  .preview-head h2 {
+    font-size: 24px;
+  }
+
   .field-title-wrap h3 {
     font-size: 16px;
   }