diff --git a/plugins/sentinel/dashboard.html b/plugins/sentinel/dashboard.html
index 7d03a7d..cea2964 100644
--- a/plugins/sentinel/dashboard.html
+++ b/plugins/sentinel/dashboard.html
@@ -142,6 +142,58 @@
   </style>
 
   <script>
+    // ── 内联高分辨率图表 (不依赖 chart.js) ──
+    function HiChart(canvasId, color, color2) {
+      this.canvas = document.getElementById(canvasId);
+      this.ctx = this.canvas.getContext('2d');
+      this.color = color;
+      this.color2 = color2 || null;  // null = single line
+      this.data = new Array(60).fill(0);
+      this.data2 = color2 ? new Array(60).fill(0) : null;
+      this.maxVal = 100;
+      this._dpr = Math.min(window.devicePixelRatio || 1, 2);
+      this._resize();
+      var self = this;
+      window.addEventListener('resize', function(){ self._resize(); });
+    }
+    HiChart.prototype._resize = function() {
+      var rect = this.canvas.parentElement.getBoundingClientRect();
+      var w = Math.max(rect.width - 8, 100);
+      var h = 60;
+      this.canvas.width = w * this._dpr;
+      this.canvas.height = h * this._dpr;
+      this.canvas.style.width = w + 'px';
+      this.canvas.style.height = h + 'px';
+      this.ctx.setTransform(this._dpr, 0, 0, this._dpr, 0, 0);
+      this._draw();
+    };
+    HiChart.prototype.update = function(val, val2) {
+      this.data.push(val);
+      if (this.data.length > 60) this.data.shift();
+      if (this.data2) { this.data2.push(val2||0); if (this.data2.length > 60) this.data2.shift(); }
+      var all = this.data2 ? this.data.concat(this.data2) : this.data;
+      this.maxVal = Math.max.apply(null, all.concat([100]));
+      this._draw();
+    };
+    HiChart.prototype._draw = function() {
+      var ctx = this.ctx, w = this.canvas.width / this._dpr, h = this.canvas.height / this._dpr;
+      ctx.clearRect(0, 0, w, h);
+      var drawLine = function(data, color, dash) {
+        ctx.strokeStyle = color; ctx.lineWidth = 2; ctx.beginPath();
+        if (dash) ctx.setLineDash([4, 3]); else ctx.setLineDash([]);
+        var step = w / (data.length - 1);
+        var scale = (h - 4) / Math.max(this.maxVal, 1);
+        for (var i = 0; i < data.length; i++) {
+          var x = i * step, y = h - 4 - data[i] * scale;
+          if (i === 0) ctx.moveTo(x, y); else ctx.lineTo(x, y);
+        }
+        ctx.stroke();
+      }.bind(this);
+      drawLine(this.data, this.color, false);
+      if (this.data2) drawLine(this.data2, this.color2, true);
+    };
+
+
     // 确保 chart.js 已加载 (SPA 导航时可能未加载)
 
     var pollTimer = null;
@@ -154,7 +206,7 @@
       var btn = document.getElementById("btn-layout");
       var grid = document.getElementById("sentinel-grid");
       // 销毁旧图表
-      try { Object.keys(_chartInstances).forEach(function(k){ var chs = _chartInstances[k]; if(chs) { Object.values(chs).forEach(function(c){ if(c&&c.destroy)c.destroy(); }); } }); } catch(e) {}
+      try { Object.keys(_chartInstances).forEach(function(k){ _chartInstances[k] = null; }); } catch(e) {}
       _chartInstances = {};
       _cardCache = {};
       _firstRender = true;
@@ -206,7 +258,7 @@
       var grid = document.getElementById("sentinel-grid");
       if (!nodes.length) {
         grid.innerHTML = '<div class="card" style="text-align:center;padding:24px;color:var(--text-dim)">暂无节点 — 切换到节点管理添加</div>';
-        try { Object.keys(_chartInstances).forEach(function(k){ var chs = _chartInstances[k]; if(chs) { Object.values(chs).forEach(function(c){ if(c&&c.destroy)c.destroy(); }); } }); } catch(e) {}
+        try { Object.keys(_chartInstances).forEach(function(k){ _chartInstances[k] = null; }); } catch(e) {}
       _chartInstances = {};
       _cardCache = {};
         _firstRender = true;
@@ -321,10 +373,7 @@
             try {
               if (charts.cpu) charts.cpu.update(cpuVal);
               if (charts.mem) charts.mem.update(memVal);
-              if (charts.net) {
-                charts.net.update(net.rx_bytes_sec||0, net.tx_bytes_sec||0);
-                if (charts.net.maxVal < 102400) { charts.net.maxVal = 102400; charts.net.draw(); }
-              }
+              if (charts.net) { charts.net.update(net.rx_bytes_sec||0, net.tx_bytes_sec||0); if (charts.net.maxVal < 102400) charts.net.maxVal = 102400; }
             } catch(e) {}
           }
           // 更新额外指标