diff --git a/apps/desktop/src/main/services/graph-builder.ts b/apps/desktop/src/main/services/graph-builder.ts
index 0a68c41..ffc58bd 100644
--- a/apps/desktop/src/main/services/graph-builder.ts
+++ b/apps/desktop/src/main/services/graph-builder.ts
@@ -8,8 +8,8 @@ export interface GraphNode { id: string; title: string; basePath: string; star:
 export interface GraphEdge { source: string; target: string; }
 export interface GraphData { nodes: GraphNode[]; edges: GraphEdge[]; }
 
-// 12 色轮换
-const COLORS = ['#e6194b','#3cb44b','#ffe119','#4363d8','#f58231','#911eb4','#46f0f0','#f032e6','#bcf60c','#fabebe','#008080','#e6beff'];
+// 分组着色——克制的墨灰阶（契合黑白灰玻璃设计体系，避免彩虹色破坏高级感）
+const COLORS = ['#9aa1ad','#6d7480','#b6bcc6','#3c414b','#c8ccd4','#5c616b','#7c8491','#4a4f58','#aab1bd','#565b66','#8b929d','#626a75'];
 
 export async function buildGraphData(root: string, tree: TreeNode[]): Promise<GraphData> {
   const docs = tree.filter(n => n.type === 'doc');
diff --git a/apps/desktop/src/renderer/features/doc-info/DocInfoPanel.tsx b/apps/desktop/src/renderer/features/doc-info/DocInfoPanel.tsx
index 757e717..9bd83f1 100644
--- a/apps/desktop/src/renderer/features/doc-info/DocInfoPanel.tsx
+++ b/apps/desktop/src/renderer/features/doc-info/DocInfoPanel.tsx
@@ -73,10 +73,12 @@ export function DocInfoPanel() {
         {links.length === 0 ? (
           <div style={{ color: 'var(--text-tertiary)', opacity: 0.6, marginBottom: 8 }}>暂无关联，可在下方快速关联或批量关联</div>
         ) : (
-          <div style={{ display: 'flex', flexDirection: 'column', gap: 4, marginBottom: 10 }}>
+          <div style={{ display: 'flex', flexDirection: 'column', gap: 6, marginBottom: 10 }}>
             {links.map(l => (
-              <div key={l} style={{ display: 'flex', alignItems: 'center', gap: 6, padding: '4px 8px', background: 'var(--bg-secondary)', borderRadius: 6, border: '1px solid var(--control-border)' }}>
-                <span style={{ flex: 1, minWidth: 0, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap', color: 'var(--text-secondary)' }} title={l}>{linkNames.get(l) ?? l}</span>
+              <div key={l} title={l} style={{ display: 'flex', alignItems: 'center', gap: 8, padding: '7px 10px', background: 'var(--bg-secondary)', borderRadius: 'var(--radius-sm)', border: '1px solid var(--control-border)', boxShadow: 'var(--shadow-soft)', transition: 'border-color .15s var(--ease), box-shadow .15s var(--ease)' }} onMouseEnter={e => { e.currentTarget.style.borderColor = 'var(--line-strong)'; e.currentTarget.style.boxShadow = 'var(--shadow-lift)'; }} onMouseLeave={e => { e.currentTarget.style.borderColor = 'var(--control-border)'; e.currentTarget.style.boxShadow = 'var(--shadow-soft)'; }}>
+                <span style={{ display: 'inline-flex', color: 'var(--text-tertiary)', flexShrink: 0 }}><Link2 size={14} /></span>
+                <span style={{ flex: 1, minWidth: 0, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap', color: 'var(--text-primary)', fontWeight: 500 }}>{linkNames.get(l) ?? l}</span>
+                <span style={{ fontSize: 10, color: 'var(--text-tertiary)', flexShrink: 0, display: 'inline-flex', alignItems: 'center', gap: 3 }}><ArrowLeftRight size={11} />双向</span>
                 <button style={iconSmall} title="打开" onClick={() => openDoc(l)}><FileText size={13} /></button>
                 <button style={iconSmall} title="解除关联（双向）" onClick={() => void linkBatch([l], true)}><X size={13} /></button>
               </div>
diff --git a/apps/desktop/src/renderer/features/graph/LinkGraph.tsx b/apps/desktop/src/renderer/features/graph/LinkGraph.tsx
index 56e6d48..01723b4 100644
--- a/apps/desktop/src/renderer/features/graph/LinkGraph.tsx
+++ b/apps/desktop/src/renderer/features/graph/LinkGraph.tsx
@@ -91,8 +91,18 @@ export function LinkGraph({ onSwitchToEditor }: { onSwitchToEditor?: () => void
       .map((e) => ({ source: idx.get(e.source)!, target: idx.get(e.target)! }));
 
     // 曲线连线（贝塞尔弧）：比直线更优雅、更符合"图谱"观感
-    const linkSel = g.append('g').attr('stroke', 'var(--line)').attr('stroke-opacity', 0.6)
-      .selectAll('path').data(links).join('path').attr('fill', 'none').attr('stroke-width', 1.1);
+    // 与当前文档直接相连的节点集合——用于高亮"关联"关系
+    const curPath = useStore.getState().currentPath;
+    const linkedIds = new Set<string>();
+    for (const e of data.edges) {
+      if (e.source === curPath) linkedIds.add(e.target);
+      if (e.target === curPath) linkedIds.add(e.source);
+    }
+    const linkSel = g.append('g')
+      .selectAll('path').data(links).join('path').attr('fill', 'none')
+      .attr('stroke', (d: any) => (d.source.id === curPath || d.target.id === curPath) ? 'var(--ink-2)' : 'var(--line)')
+      .attr('stroke-opacity', (d: any) => (d.source.id === curPath || d.target.id === curPath) ? 0.9 : 0.5)
+      .attr('stroke-width', (d: any) => (d.source.id === curPath || d.target.id === curPath) ? 2 : 1.1);
 
     // 布局参数：刻意拉大间距，卡片(180 宽)之间留足空白，避免拥挤
     const sim = forceSimulation<SimNode>(nodes)
@@ -118,31 +128,37 @@ export function LinkGraph({ onSwitchToEditor }: { onSwitchToEditor?: () => void
       const len = Math.max(1, Math.hypot(dx, dy));
       return 'M' + sx + ',' + sy + ' Q' + (mx + (nx / len) * bend * dir) + ',' + (my + (ny / len) * bend * dir) + ' ' + tx + ',' + ty;
     };
-    // 当前打开的文档作为深墨焦点节点
-    const curPath = useStore.getState().currentPath;
+    // 卡片：深墨焦点（当前文档）+ 玻璃底卡 + 分组色点 + 关联高亮（保持每卡 1 个 rect）
     const nodeSel = g.append('g').selectAll('g').data(nodes).join('g').attr('cursor', 'pointer')
       // 阴影 filter 加在 g 层：若加在卡片 rect 上会导致该 rect 的 pointer-events 命中失效（点击穿透）
       .attr('filter', (d: any) => d.id === curPath ? 'url(#graph-card-focus)' : 'url(#graph-card-shadow)');
 
-    // 卡片：圆角底卡 + 标题 + 路径 + 星标（无图标，更简洁）；当前文档 = 深墨焦点节点，文字居中
-    nodeSel.append('rect').attr('class', 'gcard').attr('x', -CARD_W / 2).attr('y', -CARD_H / 2).attr('width', CARD_W).attr('height', CARD_H).attr('rx', 13)
+    nodeSel.append('rect').attr('class', 'gcard').attr('x', -CARD_W / 2).attr('y', -CARD_H / 2).attr('width', CARD_W).attr('height', CARD_H).attr('rx', 14)
       .attr('fill', (d: any) => d.id === curPath ? 'var(--ink)' : 'var(--float)')
-      .attr('stroke', (d: any) => d.id === curPath ? 'var(--ink)' : 'var(--line)')
-      .attr('stroke-width', 1.2)
+      .attr('stroke', (d: any) => d.id === curPath ? 'var(--ink)' : (linkedIds.has(d.id) ? 'var(--ink-2)' : 'var(--line)'))
+      .attr('stroke-width', (d: any) => (d.id === curPath || linkedIds.has(d.id)) ? 1.6 : 1.1)
       .attr('pointer-events', 'all');
+    // 分组色点（左上角，circle 不增加卡片 rect 计数）
+    nodeSel.append('circle').attr('cx', -CARD_W / 2 + 10).attr('cy', -CARD_H / 2 + 10).attr('r', 3.4)
+      .attr('fill', (d: any) => d.id === curPath ? 'var(--space)' : (d.color || 'var(--ink-3)'))
+      .attr('opacity', 0.9);
     // 标题（水平居中）
-    nodeSel.append('text').attr('x', 0).attr('y', -2).attr('text-anchor', 'middle')
+    nodeSel.append('text').attr('x', 0).attr('y', -3).attr('text-anchor', 'middle')
       .attr('fill', (d: any) => d.id === curPath ? 'var(--space)' : 'var(--ink)')
-      .attr('font-size', 13).attr('font-weight', (d: any) => d.id === curPath ? 600 : 550).attr('font-family', 'sans-serif')
+      .attr('font-size', 13).attr('font-weight', (d: any) => d.id === curPath ? 650 : (linkedIds.has(d.id) ? 600 : 550)).attr('font-family', 'sans-serif')
       .text((d) => truncate(d.title, 16));
     // 路径副文本（水平居中）
-    nodeSel.append('text').attr('x', 0).attr('y', 13).attr('text-anchor', 'middle')
-      .attr('fill', (d: any) => d.id === curPath ? 'rgba(255,255,255,0.7)' : 'var(--ink-4)')
+    nodeSel.append('text').attr('x', 0).attr('y', 14).attr('text-anchor', 'middle')
+      .attr('fill', (d: any) => d.id === curPath ? 'rgba(255,255,255,0.72)' : 'var(--ink-4)')
       .attr('font-size', 10).attr('font-family', 'sans-serif')
       .text((d) => truncate(d.basePath || d.id, 18));
     // 星标（右上角）
-    nodeSel.filter((d) => d.star).append('text').attr('x', CARD_W / 2 - 14).attr('y', 4)
+    nodeSel.filter((d) => d.star).append('text').attr('x', CARD_W / 2 - 14).attr('y', 5)
       .attr('fill', (d: any) => d.id === curPath ? 'var(--space)' : 'var(--ink-3)').attr('font-size', 14).text('★');
+    // 与当前文档关联的卡片右上角加一个小圆点提示（circle，不影响 rect 计数）
+    nodeSel.filter((d: any) => linkedIds.has(d.id) && d.id !== curPath).append('circle')
+      .attr('cx', CARD_W / 2 - 12).attr('cy', -CARD_H / 2 + 10).attr('r', 3)
+      .attr('fill', 'var(--ink-2)').attr('opacity', 0.85);
 
     // 悬停高亮（CSS，不增加 rect）
     svg.append('style').text('.gcard { transition: stroke-width .16s var(--ease), stroke .16s var(--ease); } g[data-hover] .gcard { stroke: var(--line-strong); stroke-width: 1.7; }');