diff --git a/js/enemies.js b/js/enemies.js
index 3652c71..ee79f65 100644
--- a/js/enemies.js
+++ b/js/enemies.js
@@ -303,24 +303,24 @@ function bossMain(b,def,fm){
       const ks=b.keys,n=ks.n;
       if(ks.hotT>0){ks.hotT--;
         if(ks.hotT===0){const list=ks.hotList||[ks.hot];
-          for(const kh of list){if(kh<0)continue;const kx=-(n-1)*4.75+kh*9.5;
+          for(const kh of list){if(kh<0)continue;const kx=-(n-1)*5+kh*10;   // 与drawPiano键位一致（整数键距10）
             bossBeam(b.x+kx,b.y+18,b.x+kx,H+8,4,"#43e8ff",7,22,18,{b,ox:kx,oy:18,followX2:true});}
           ks.hotList=null;ks.hot=-1;SFX.eshoot();}}
       ks.t--;
       if(ks.t<=0&&ks.hotT<=0){
         if(ks.i>=ks.seq.length){ // 布下一局：轮换模式
           ks.mode=(ks.mode+1)%4;
-          if(ks.mode===0){ks.seq=[];for(let i=0;i<n;i++)ks.seq.push(i);}
-          else if(ks.mode===1){ks.seq=[];for(let i=n-1;i>=0;i--)ks.seq.push(i);}
+          if(ks.mode===0){ks.seq=[];for(let i=0;i<n-3;i++)ks.seq.push(i);}   // 顺扫止于18号：最右3键永远安全
+          else if(ks.mode===1){ks.seq=[];for(let i=n-1;i>=3;i--)ks.seq.push(i);}   // 反扫止于3号：最左3键永远安全
           else if(ks.mode===2){ks.seq=shuffled(n);}
           else{ks.seq=[];for(let i=0;i<6+ph*2;i++)ks.seq.push(-1);}   // -1=齐射标记
-          ks.i=0;ks.t=Math.round((ph?8:14)/fm);   // 光速进入下一种模式
+          ks.i=0;ks.t=Math.round((ph?14:22)/fm);
         }else{const cur=ks.seq[ks.i++];
-          if(cur===-1){const pool=shuffled(n);ks.hotList=pool.slice(0,4+ph*2);ks.hotT=4;ks.t=Math.round((ph?8:12)/fm);}
-          else{ks.hot=cur;ks.hotT=1;ks.t=Math.round((ph?1:1)/fm);}   // 扫射模式：每tick一键（≈5倍速）
+          if(cur===-1){const pool=shuffled(n);ks.hotList=pool.slice(0,4+ph*2);ks.hotT=6;ks.hotT0=6;ks.t=Math.round((ph?14:20)/fm);}
+          else{ks.hot=cur;ks.hotT=2;ks.hotT0=2;ks.t=Math.round((ph?2:3)/fm);}   // 扫射模式（整体已降速）
         }
       }
-      b.mainT=2;break;}
+      b.mainT=4;break;}
     case "hive":  // 母巢核心：环弹+孵化
       for(let i=0;i<10+ph*4;i++)ebul(b.x,b.y,i/(10+ph*4)*TAU+b.t*0.03,1.6+0.2*ph,"orbO");
       if(b.t%240<3)for(let i=0;i<1+ph;i++)spawnEnemy(ph>=2?"kami":"mini",b.x+rnd(-30,30),b.y+8,false);
diff --git a/js/render.js b/js/render.js
index ec63d0f..f1ec312 100644
--- a/js/render.js
+++ b/js/render.js
@@ -228,11 +228,19 @@ function drawAssault(t,fl,swp,ph,mp){ // 暗黑突击（swp=翼展角；炮管/
 }
 function drawPiano(b,t,fl,split){ // 激光钢琴（split=裂壳进度0~1）
   const ks=b.keys,n=ks?ks.n:21;
-  px(-(n-1)*4.75-5,6,(n-1)*9.5+10,19,"#141821");   // 键槽
-  for(let i=0;i<n;i++){const kx=-(n-1)*4.75+i*9.5;
+  px(-(n-1)*5-5,6,(n-1)*10+10,19,"#141821");   // 键槽（键距10统一，不再因非整数取整成对）
+  for(let i=0;i<n;i++){const kx=-(n-1)*5+i*10;
     const hot=ks&&(ks.hot===i||(ks.hotList&&ks.hotList.indexOf(i)>=0));
     px(kx-4,8,8,14,hot?(t%6<3?"#e8fbff":"#43e8ff"):"#d8e4f0");
     px(kx-4,20,8,2,hot?"#43e8ff":"#8a9ab8");}
+  if(ks&&ks.hotT>0&&ks.hotT0){const pr=1-ks.hotT/ks.hotT0;   // 蓄力前摇：即将发射的键下方圆形蓄力
+    const list=ks.hotList||(ks.hot>=0?[ks.hot]:[]);
+    for(const kh of list){const kx=-(n-1)*5+kh*10;
+      ctx.globalAlpha=0.3+0.55*pr;ctx.strokeStyle="#43e8ff";ctx.lineWidth=1.5;
+      ctx.beginPath();ctx.arc(kx,28,2+3.5*pr,0,TAU);ctx.stroke();
+      ctx.globalAlpha=0.22*pr;ctx.fillStyle="#43e8ff";
+      ctx.beginPath();ctx.arc(kx,28,2+3.5*pr,0,TAU);ctx.fill();
+      ctx.globalAlpha=1;}}
   const off=split*30;   // 两半穹顶向左右裂开
   for(const sd of[-1,1]){ctx.save();ctx.translate(sd*off,0);
     const q0=sd<0?Math.PI:Math.PI*1.5,q1=sd<0?Math.PI*1.5:Math.PI*2;
@@ -247,9 +255,13 @@ function drawPiano(b,t,fl,split){ // 激光钢琴（split=裂壳进度0~1）
   if(split<1){ctx.globalAlpha=1-split;   // 一阶段青色核心窗
     px(-7,-14,14,9,fl||"#43e8ff");px(-4,-12,8,5,"#bfefff");
     ctx.globalAlpha=1;}
-  px(-10-off,-32,20,10,"#3a4460");px(-6-off,-37,12,5,"#55648a");   // 舰桥随左半壳
-  if(split<0.4)for(let i=0;i<7;i++){const a=Math.PI+(i+0.5)/7*Math.PI;
-    px(Math.cos(a)*110-1.5,6+Math.sin(a)*30-1.5,3,3,"#9fb4d8");}
+  for(const sd of[-1,1]){ctx.save();ctx.translate(sd*off,0);   // 舰桥从中线剖开，各随各的半壳
+    px(sd<0?-10:0,-32,10,10,"#3a4460");
+    px(sd<0?-6:0,-37,6,5,"#55648a");
+    for(let i=0;i<7;i++){const a=Math.PI+(i+0.5)/7*Math.PI;   // 壳沿铆钉也随半壳
+      if((sd<0)!==(a<Math.PI*1.5))continue;
+      px(Math.cos(a)*110-1.5,6+Math.sin(a)*30-1.5,3,3,"#9fb4d8");}
+    ctx.restore();}
 }
 /* ---- Boss光束与浮游炮渲染 ---- */
 function drawFunnel(f){   // 蓝白长钉无人机（单架）