'init'

app/components/custom/CustomParticleBackground.tsx

@@ -0,0 +1,117 @@
+"use client";
+
+/**
+ * 自实现 Canvas 粒子背景 - 封装待用
+ * 无第三方依赖，轻量级替代方案
+ */
+
+import { useEffect, useRef } from "react";
+
+const PARTICLE_COUNT = 50;
+const CONNECT_DISTANCE = 120;
+
+type Particle = {
+  x: number;
+  y: number;
+  vx: number;
+  vy: number;
+  r: number;
+  opacity: number;
+};
+
+export function CustomParticleBackground() {
+  const canvasRef = useRef<HTMLCanvasElement>(null);
+
+  useEffect(() => {
+    const canvas = canvasRef.current;
+    if (!canvas) return;
+
+    const ctx = canvas.getContext("2d");
+    if (!ctx) return;
+
+    let animationId: number;
+    let particles: Particle[] = [];
+
+    const resize = () => {
+      const dpr = Math.min(window.devicePixelRatio || 1, 2);
+      const w = canvas.offsetWidth;
+      const h = canvas.offsetHeight;
+      canvas.width = w * dpr;
+      canvas.height = h * dpr;
+      ctx.scale(dpr, dpr);
+      canvas.style.width = `${w}px`;
+      canvas.style.height = `${h}px`;
+
+      particles = Array.from({ length: PARTICLE_COUNT }, () => ({
+        x: Math.random() * w,
+        y: Math.random() * h,
+        vx: (Math.random() - 0.5) * 0.3,
+        vy: (Math.random() - 0.5) * 0.3,
+        r: Math.random() * 2 + 0.5,
+        opacity: Math.random() * 0.4 + 0.1,
+      }));
+    };
+
+    const getAccentRgb = () => {
+      const style = getComputedStyle(document.documentElement);
+      const accent = style.getPropertyValue("--accent").trim() || "#f59e0b";
+      const m = accent.match(/^#([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})$/i);
+      if (m) return `${parseInt(m[1], 16)}, ${parseInt(m[2], 16)}, ${parseInt(m[3], 16)}`;
+      return "245, 158, 11";
+    };
+
+    const draw = () => {
+      const w = canvas.offsetWidth;
+      const h = canvas.offsetHeight;
+      const rgb = getAccentRgb();
+
+      ctx.clearRect(0, 0, w, h);
+
+      particles.forEach((p, i) => {
+        p.x += p.vx;
+        p.y += p.vy;
+        if (p.x < 0 || p.x > w) p.vx *= -1;
+        if (p.y < 0 || p.y > h) p.vy *= -1;
+
+        ctx.beginPath();
+        ctx.arc(p.x, p.y, p.r, 0, Math.PI * 2);
+        ctx.fillStyle = `rgba(${rgb}, ${p.opacity})`;
+        ctx.fill();
+
+        for (let j = i + 1; j < particles.length; j++) {
+          const q = particles[j];
+          const dx = p.x - q.x;
+          const dy = p.y - q.y;
+          const dist = Math.hypot(dx, dy);
+          if (dist < CONNECT_DISTANCE) {
+            ctx.beginPath();
+            ctx.moveTo(p.x, p.y);
+            ctx.lineTo(q.x, q.y);
+            ctx.strokeStyle = `rgba(${rgb}, ${0.08 * (1 - dist / CONNECT_DISTANCE)})`;
+            ctx.lineWidth = 0.5;
+            ctx.stroke();
+          }
+        }
+      });
+
+      animationId = requestAnimationFrame(draw);
+    };
+
+    resize();
+    window.addEventListener("resize", resize);
+    draw();
+
+    return () => {
+      window.removeEventListener("resize", resize);
+      cancelAnimationFrame(animationId);
+    };
+  }, []);
+
+  return (
+    <canvas
+      ref={canvasRef}
+      className="pointer-events-none absolute inset-0"
+      aria-hidden
+    />
+  );
+}