标记改为整张便签图（黄底黑字合成为一张 Billboard）

src/scene/CesiumGlobe.js

@@ -36,19 +36,26 @@ function sphericalAreaKm2(polys) {
   return area * R * R;
 }
 
-// 生成圆角黑色背景 canvas（尺寸按文字实际测量宽度）
-function makeRoundedBg(text, fontSize) {
-  const padX = 12, padY = 7, radius = 10;
+// 生成便签 canvas：黄色圆角底 + 黑色加粗文字（整张图，背景与文字完美对齐）
+function makeStickyNote(text, fontSize) {
+  const padX = 14, padY = 8, radius = 8, S = 2; // S: 2x 超采样，文字更清晰
+  const font = `bold ${fontSize}px "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif`;
   const m = document.createElement('canvas');
   const mctx = m.getContext('2d');
-  mctx.font = `bold ${fontSize}px "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif`;
+  mctx.font = font;
   const textW = mctx.measureText(text).width;
   const w = Math.max(1, Math.ceil(textW + padX * 2));
   const h = Math.ceil(fontSize + padY * 2);
   const c = document.createElement('canvas');
-  c.width = w;
-  c.height = h;
+  c.width = w * S;
+  c.height = h * S;
   const ctx = c.getContext('2d');
+  ctx.scale(S, S);
+
+  // 黄色圆角底 + 阴影
+  ctx.shadowColor = 'rgba(0, 0, 0, 0.20)';
+  ctx.shadowBlur = 5;
+  ctx.shadowOffsetY = 2;
   ctx.beginPath();
   ctx.moveTo(radius, 0);
   ctx.arcTo(w, 0, w, h, radius);
@@ -56,12 +63,20 @@ function makeRoundedBg(text, fontSize) {
   ctx.arcTo(0, h, 0, 0, radius);
   ctx.arcTo(0, 0, w, 0, radius);
   ctx.closePath();
-  ctx.shadowColor = 'rgba(0, 0, 0, 0.18)';
-  ctx.shadowBlur = 4;
-  ctx.shadowOffsetY = 1;
   ctx.fillStyle = '#FFF9A6';
   ctx.fill();
-  return { canvas: c, textW };
+
+  // 黑色加粗文字（无阴影）
+  ctx.shadowColor = 'transparent';
+  ctx.shadowBlur = 0;
+  ctx.shadowOffsetY = 0;
+  ctx.fillStyle = '#14100d';
+  ctx.font = font;
+  ctx.textBaseline = 'middle';
+  ctx.textAlign = 'center';
+  ctx.fillText(text, w / 2, h / 2 + 1);
+
+  return { canvas: c, scale: 1 / S };
 }
 
 export class CesiumGlobe {
@@ -172,7 +187,6 @@ export class CesiumGlobe {
   _buildMarkers() {
     const viewer = this.viewer;
     const gold = Cesium.Color.fromCssColorString('#e0c46a');
-    const ivory = Cesium.Color.fromCssColorString('#e8d9b4');
     const ink = Cesium.Color.fromCssColorString('#14100d');
 
     ENTRIES.forEach((entry, i) => {
@@ -187,39 +201,27 @@ export class CesiumGlobe {
           disableDepthTestDistance: Number.POSITIVE_INFINITY,
           distanceDisplayCondition: new Cesium.DistanceDisplayCondition(0, 1e7),
         },
-        label: {
-          text: entry.name,
-          font: 'bold 19px "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif',
-          fillColor: ink,
-          style: Cesium.LabelStyle.FILL,
-          horizontalOrigin: Cesium.HorizontalOrigin.LEFT,
-          verticalOrigin: Cesium.VerticalOrigin.CENTER,
-          pixelOffset: new Cesium.Cartesian2(10, 0),
-          heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
-          disableDepthTestDistance: Number.POSITIVE_INFINITY,
-          distanceDisplayCondition: new Cesium.DistanceDisplayCondition(0, 1e7),
-          show: true,
-        },
       });
 
       entity.entryIndex = i;
 
-      // 选中时显示的圆角黑色背景
-      const bg = makeRoundedBg(entry.name, 19);
-      const bgEntity = viewer.entities.add({
+      // 便签：黄底黑字（整张图，贴到圆点右侧）
+      const note = makeStickyNote(entry.name, 19);
+      const noteEntity = viewer.entities.add({
         position: Cesium.Cartesian3.fromDegrees(entry.lng, entry.lat),
         billboard: {
-          image: bg.canvas,
-          horizontalOrigin: Cesium.HorizontalOrigin.CENTER,
+          image: note.canvas,
+          scale: note.scale,
+          horizontalOrigin: Cesium.HorizontalOrigin.LEFT,
           verticalOrigin: Cesium.VerticalOrigin.CENTER,
-          pixelOffset: new Cesium.Cartesian2(10 + bg.textW / 2, 0),
+          pixelOffset: new Cesium.Cartesian2(12, 0),
           heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
           disableDepthTestDistance: Number.POSITIVE_INFINITY,
-          show: true,
+          distanceDisplayCondition: new Cesium.DistanceDisplayCondition(0, 1e7),
         },
       });
 
-      this.markers.push({ entity, bg: bgEntity, index: i });
+      this.markers.push({ entity, index: i });
     });
   }
 
@@ -381,7 +383,7 @@ export class CesiumGlobe {
   setSelected(index) {
     this.selected = index;
     if (!this.viewer) return;
-    this.markers.forEach(({ entity, bg, index: i }) => {
+    this.markers.forEach(({ entity, index: i }) => {
       const on = i === index;
       entity.point.outlineWidth = on ? 3 : 1; // 选中加粗黑圈，不放大
     });