diff --git a/star-raid/css/style.css b/star-raid/css/style.css
index 6a293e5..ea56c9c 100644
--- a/star-raid/css/style.css
+++ b/star-raid/css/style.css
@@ -52,6 +52,9 @@ h1.logo{font-size:clamp(20px,5.4vw,44px);color:#fff;letter-spacing:4px;line-heig
 .stat-grid b{color:var(--gold);text-align:right}
 /* ship / mode select cards */
 .pick{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
+.rush-grp{width:100%;margin:2px 0 10px}
+.rush-grp .h3{font-size:clamp(9px,1.6vw,12px);letter-spacing:3px;margin-bottom:5px}
+.rush-row{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
 .pcard{width:min(28vw,132px);background:var(--panel);border:3px solid var(--line);padding:10px 6px;cursor:pointer;transition:all .12s}
 .pcard:hover{transform:translateY(-3px)}
 .pcard.sel{border-color:var(--cyan);box-shadow:0 0 16px rgba(65,230,255,.35)}
diff --git a/star-raid/js/enemies.js b/star-raid/js/enemies.js
index 277dbc4..5a57faf 100644
--- a/star-raid/js/enemies.js
+++ b/star-raid/js/enemies.js
@@ -188,17 +188,18 @@ function updateSpawner(){
 }
 /* ================= Boss 战 ================= */
 /* 8大Boss：1种主攻击模式 + 同时1~2种随机小攻击；血量阈值触发二/三阶段变形 */
+/* 难度tier：0简单/1中等/2困难/3地狱（rush界面分组；用户2026-08-06分级） */
 const BOSSES=[
- {name:"巡逻巡洋舰",sub:"PATROL CRUISER",hp:950,col:"#e0393e",r:22,main:"cruiser",minors:["snipe","ring"],phases:2},
- {name:"太空原种",sub:"SPACE SPAWN",hp:1350,col:"#ff8fc8",r:20,rr:[20,34],ryy:[26,18],wide:1,main:"spawn",minors:["wiggle","spikeSnipe","sporeArc","tentBeam","mawSnipe","wingRain"],phases:2},
- {name:"歼灭者",sub:"ANNIHILATOR",hp:1700,col:"#b05ce8",r:22,main:"annihilate",minors:["aimSpread","spawnMine"],phases:3},
- {name:"暗黑突击",sub:"DARK ASSAULT",hp:2100,col:"#ff3355",r:9,rr:[9,10,11],ryy:[5,6,7],main:"assault",minors:["rain","aimSpread"],phases:3},
- {name:"激光钢琴",sub:"LASER PIANO",hp:5000,col:"#43e8ff",r:26,rr:[100,100],ryy:[30,30],main:"piano",minors:["topRain","pedal"],phases:2,static:1},
- {name:"母巢核心",sub:"HIVE CORE",hp:2800,col:"#ff9a3d",r:22,main:"hive",minors:["spawnMini","aimSpread","ring"],phases:3},
- {name:"夺权者X",sub:"USURPER X",hp:3700,col:"#e8f4ff",r:24,rr:[58,26],ryy:[34,40],wide:1,main:"usurper",minors:["deckVolley","pillar","aimSpread"],phases:2},
- {name:"暗黑魔碟",sub:"DARK SAUCER",hp:4500,col:"#8a5cff",r:24,rr:[30,32,34],main:"saucer",minors:["ringBig","coneFan","crossEye","dartSpiral"],phases:3},
- {name:"黑石要塞",sub:"BLACKSTONE",hp:3400,col:"#5cff9d",r:30,rr:[34,37],ryy:[26,28],wide:1,main:"blackstone",minors:["deckGuns","crackRift","starLine"],phases:2},
- {name:"泰伦虫族母舰",sub:"TYRANID HIVESHIP",hp:3200,col:"#7dff8a",r:26,rr:[26,29,32],ryy:[36,38,40],main:"hivespawn",minors:["sporeBloom","tentSweep","acidGas"],phases:3}
+ {name:"巡逻巡洋舰",sub:"PATROL CRUISER",hp:950,col:"#e0393e",r:22,main:"cruiser",minors:["snipe","ring"],phases:2,tier:0},
+ {name:"太空原种",sub:"SPACE SPAWN",hp:1350,col:"#ff8fc8",r:20,rr:[20,34],ryy:[26,18],wide:1,main:"spawn",minors:["wiggle","spikeSnipe","sporeArc","tentBeam","mawSnipe","wingRain"],phases:2,tier:1},
+ {name:"歼灭者",sub:"ANNIHILATOR",hp:1700,col:"#b05ce8",r:22,main:"annihilate",minors:["aimSpread","spawnMine"],phases:3,tier:0},
+ {name:"暗黑突击",sub:"DARK ASSAULT",hp:2100,col:"#ff3355",r:9,rr:[9,10,11],ryy:[5,6,7],main:"assault",minors:["rain","aimSpread"],phases:3,tier:2},
+ {name:"激光钢琴",sub:"LASER PIANO",hp:5000,col:"#43e8ff",r:26,rr:[100,100],ryy:[30,30],main:"piano",minors:["topRain","pedal"],phases:2,static:1,tier:2},
+ {name:"母巢核心",sub:"HIVE CORE",hp:2800,col:"#ff9a3d",r:22,main:"hive",minors:["spawnMini","aimSpread","ring"],phases:3,tier:0},
+ {name:"夺权者X",sub:"USURPER X",hp:3700,col:"#e8f4ff",r:24,rr:[58,26],ryy:[34,40],wide:1,main:"usurper",minors:["deckVolley","pillar","aimSpread"],phases:2,tier:2},
+ {name:"暗黑魔碟",sub:"DARK SAUCER",hp:4500,col:"#8a5cff",r:24,rr:[30,32,34],main:"saucer",minors:["coneFan","crossEye","dartSpiral"],phases:3,tier:3},   // 间歇期无圆圈弹幕（去ringBig，P3主攻击仍两层）
+ {name:"黑石要塞",sub:"BLACKSTONE",hp:3400,col:"#5cff9d",r:30,rr:[34,37],ryy:[26,28],wide:1,main:"blackstone",minors:["deckGuns","crackRift","starLine"],phases:2,tier:2},
+ {name:"泰伦虫族母舰",sub:"TYRANID HIVESHIP",hp:3200,col:"#7dff8a",r:26,rr:[26,29,32],ryy:[36,38,40],main:"hivespawn",minors:["sporeBloom","tentSweep","acidGas"],phases:3,tier:1}
 ];
 /* Boss命中判定：支持椭圆（宽扁机型），rr=x半径，ry=y半径 */
 function bossHit(x,y,r){
@@ -265,6 +266,7 @@ function startBoss(){
     col:b.col,name:b.name,sub:b.sub,fireM:BAL.fireMul(n)*(G.diff===1?BAL.hard.fire:1),dead:false,
     mainT:100,minorT:9999,minorSet:[],rerollT:340,ax:W/2,ay:64,mt:0,landed:false};
   if(b.main==="piano")G.boss.mainT=24;   // 激光钢琴：缩短开局空窗
+  else if(b.main==="assault")G.boss.mainT=rndi(240,900);   // 暗黑突击：首次冲撞4~15秒随机
   G.bossN++;SFX.warn();MUS.start(true);
   banner("WARNING — "+b.name,"#ff5566",150);
 }
@@ -281,26 +283,31 @@ function updateBoss(){
     G.eb.length=0;G.bbeams.length=0;b.keys=null;SFX.warn();G.shake=Math.max(G.shake,5);
     if(b.idx===6){G.funnels.length=0;b.form=null;if(np===1){spawnFunnels(b,4);b.plT=Math.round(300/b.fireM);}}   // 夺权者X二阶段：增至4架僚机
     banner(b.name+" — 第"+["一","二","三"][np]+"形态","#ff5566",90);}
-  if(b.transT>0){b.transT--;
+  if(b.transT>0){b.transT--;b.dashTrail=null;   // 变形期间清冲撞残影
     if(b.transT===0){explodeFx(b.x,b.y,"dark",1.3);G.shake=Math.max(G.shake,6);
       for(let i=0;i<10;i++)ebul(b.x,b.y,i/10*TAU,1.5,"orbP",12);}   // 变形完成爆发环弹
     updateFunnels();return;}  // 变形期间不攻击
   // —— 冲撞状态机（暗黑突击） ——
   if(b.dashSt){
     const ds=b.dashSt;
-    if(ds.ph==="tele"){ds.t--;
+    if(ds.ph==="tele"){b.dashTrail=null;ds.t--;
       if(ds.t<=0){const ap3=aimPt(),a=Math.atan2(ap3.y-b.y,ap3.x-b.x);
-        ds.ph="go";ds.t=85;ds.vx=Math.cos(a)*7.2;ds.vy=Math.sin(a)*7.2;SFX.warn();}}
+        ds.ph="go";ds.t=85;ds.vx=Math.cos(a)*(b.phase>=2?10.8:7.2);ds.vy=Math.sin(a)*(b.phase>=2?10.8:7.2);SFX.warn();}}   // 三阶段冲撞速度150%
     else if(ds.ph==="go"){b.x+=ds.vx;b.y+=ds.vy;ds.t--;
+      if(b.phase>=1){b.dashTrail=b.dashTrail||[];b.dashTrail.push({x:b.x,y:b.y});if(b.dashTrail.length>7)b.dashTrail.shift();}   // 二三阶段：冲锋红色残影
       if(G.time%9===0){const a5=Math.atan2(aimPt().y-b.y,aimPt().x-b.x);ebul(b.x,b.y,a5,2.7,"orbR",13);}   // 冲撞途中瞄准弹
-      if(ds.t<=0||b.y>H+26||b.y<-46||b.x<-26||b.x>W+26){ds.ph="back";ds.t=160;}}
-    else{b.x+=(b.ax-b.x)*0.045;b.y+=(b.ay-b.y)*0.045;ds.t--;
-      if(ds.t<=0||(Math.abs(b.x-b.ax)<5&&Math.abs(b.y-b.ay)<5)){b.dashSt=null;b.mainT=Math.round(105/b.fireM);}}   // 冲撞间隔+50%
+      if(ds.t<=0||b.y>H+26||b.y<-46||b.x<-26||b.x>W+26){ds.ph="back";ds.t=b.phase>=2?90:160;}}
+    else{b.dashTrail=null;
+      const k2=b.phase>=2?0.12:0.045;   // 三阶段回位更快=惯性更小
+      b.x+=(b.ax-b.x)*k2;b.y+=(b.ay-b.y)*k2;ds.t--;
+      if(ds.t<=0||(Math.abs(b.x-b.ax)<5&&Math.abs(b.y-b.ay)<5)){b.dashSt=null;b.mainT=rndi(240,900);}}   // 冲撞间隔4~15秒随机
     updateFunnels();return;
   }
   // —— 常规移动 ——
   if(def.static){b.x+=(W/2-b.x)*0.05;b.y+=(52-b.y)*0.02;}
-  else if(b.idx===3){b.x=W/2+Math.sin(b.mt*0.034)*62;b.y=b.ty+Math.sin(b.mt*0.021)*18;}   // 暗黑突击：小体型高机动（空闲大幅提速）
+  else if(b.idx===3){   // 暗黑突击：小体型高机动；三阶段更快+上下范围更大+惯性更小（速度积分，转折锐利）
+    if(b.phase>=2){b.x=clamp(b.x+62*0.052*Math.cos(b.mt*0.052),26,W-26);b.y=b.ty+Math.sin(b.mt*0.03)*27;}
+    else{b.x=W/2+Math.sin(b.mt*0.034)*62;b.y=b.ty+Math.sin(b.mt*0.021)*18;}}
   else if(b.idx===6){const usp=b.phase>=1?0.028:0.008,amp=b.phase>=1?70:44;
     b.x=clamp(b.x+amp*usp*Math.cos(b.mt*usp),30,W-30);   // 速度积分定位：换阶段参数突变也不瞬移
     b.yA=(b.yA||8)+((b.phase>=1?12:8)-(b.yA||8))*0.05;b.y=b.ty+Math.sin(b.mt*0.011)*b.yA;}   // 夺权者X：P1巨大笨重→P2紧凑灵活
@@ -318,7 +325,7 @@ function updateBoss(){
     else{
       if(b.plT===142){b.laserT=142;b.warpChg=0.001;SFX.warn();}
       if(b.plT<=142&&b.plT>90)b.warpChg=Math.min(1,(142-b.plT)/52);
-      if(b.plT===90){b.warpChg=0;bossBeam(b.x,b.y+6,b.x,H+8,b.phase>=1?24:20,"#5cff9d",10,80,30,{b,ox:0,oy:6,followX2:true,sweep:1,amp:b.phase>=1?70:50});}
+      if(b.plT===90){b.warpChg=0;bossBeam(b.x,b.y+6,b.x,H+8,b.phase>=1?24:20,"#5cff9d",10,80,99999,{b,ox:0,oy:6,followX2:true,sweep:1,amp:b.phase>=1?70:50});}   // 亚空间主炮：99999伤害
     }
   }
   if(b.idx===9){   // 泰伦触手扫击：9秒一次左右随机 + 玩家靠近立即触发对应侧
@@ -334,7 +341,7 @@ function updateBoss(){
             for(let i=1;i<7;i++){const f=i/6,sr=3.2*(1-f*0.45)+G.stat.hitR+1;
               const ax=pts[i-1].x,ay=pts[i-1].y,dx=pts[i].x-ax,dy=pts[i].y-ay,L2=dx*dx+dy*dy||1;
               const tt=clamp(((lx-ax)*dx+(ly-ay)*dy)/L2,0,1),cx=ax+dx*tt,cy=ay+dy*tt;
-              if(dist2(lx,ly,cx,cy)<sr*sr){tn.hitDone=true;hitPlayer(28);break;}}}
+              if(dist2(lx,ly,cx,cy)<sr*sr){tn.hitDone=true;hitPlayer(99999);break;}}}   // 触手抽打：99999伤害
         }
         if(tn.act<=0)tn.rec=40;
       }
@@ -382,7 +389,7 @@ function bossMain(b,def,fm){
       b.mainT=Math.round(10/fm);break;}
     case "assault":  // 暗黑突击：启动冲撞（锚点记当前位置，冲撞归来后正弦从此继续）
       b.dashSt={ph:"tele",t:52};b.ax=b.x;b.ay=b.y;b.mainT=9999;break;
-    case "piano": {  // 激光钢琴：21键，四种模式轮换——顺扫(逼走位)/反扫/乱序/齐射
+    case "piano": {  // 激光钢琴：21键，五种模式随机——顺扫/反扫/乱序/齐射/滑奏（每次重抽，不固定轮换）
       if(!b.keys)b.keys={n:21,seq:[],i:0,t:2,hot:-1,hotT:0,hotList:null,mode:3};
       const ks=b.keys,n=ks.n;
       if(ks.hotT>0){ks.hotT--;
@@ -392,8 +399,8 @@ function bossMain(b,def,fm){
           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（5种）
-          ks.mode=(ks.mode+1)%5;
+        if(ks.i>=ks.seq.length){ // 布下一局：随机抽模式（5种）
+          ks.mode=rndi(0,5);
           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);}
@@ -439,7 +446,7 @@ function bossMain(b,def,fm){
           ebul(px2,py2,a6,4.4,"dartS",15);}   // 发射点=最下甲板炮口（与drawUsurper同源）
         b.mainT=Math.round(46/fm);
       }else{
-        if(!b.plT||b.plT<=0){bossBeam(b.x,b.y+20,b.x,H+8,22,"#7ce9ff",46,80,30,{b,ox:0,oy:20,followX2:true});
+        if(!b.plT||b.plT<=0){bossBeam(b.x,b.y+20,b.x,H+8,22,"#7ce9ff",46,80,99999,{b,ox:0,oy:20,followX2:true});   // 巨宽核心激光：99999伤害
           b.laserT=130;b.plT=Math.round(420/fm);b.mainT=40;SFX.warn();}
         else{for(let k=-1;k<=1;k++)ebul(b.x,b.y+30,a0+k*0.14,4.4,"dartS",16);
           b.mainT=Math.round(88/fm);}
@@ -456,7 +463,7 @@ function bossMain(b,def,fm){
       b.mainT=Math.round((ph>=2?24:ph===1?30:36)/fm);
       if(ph>=1&&(!b.eyeT||b.eyeT<=0)){const ex=ap2.x;
         for(const sd of[-1,1])bossBeam(b.x+sd*9,b.y-3,ex+sd*6,H+8,4,"#ff3355",22,26,20,{b,ox:sd*9,oy:-3});
-        b.eyeT=Math.round(150/fm);}
+        b.eyeT=Math.round(300/fm);}   // 二阶段激光间隔翻倍（150→300）；三阶段不变
       if(ph>=2&&b.hornT<=0){const sd=(b.hornSide=(b.hornSide||1)*-1);
         const hx=b.x+sd*41,hy=b.y-33,ha=Math.atan2(ap2.y-hy,ap2.x-hx);
         for(let k=-1;k<=1;k++)ebul(hx,hy,ha+k*0.16,2.8,"orbR",15);
diff --git a/star-raid/js/render.js b/star-raid/js/render.js
index 2ff7fb4..a1d27f0 100644
--- a/star-raid/js/render.js
+++ b/star-raid/js/render.js
@@ -36,6 +36,12 @@ function poly(pts,col){ctx.fillStyle=col;ctx.beginPath();ctx.moveTo(pts[0],pts[1
 function circ(x,y,r,col){ctx.fillStyle=col;ctx.beginPath();ctx.arc(x,y,r,0,TAU);ctx.fill();}
 function drawBoss(){
   const b=G.boss;if(!b)return;
+  // 暗黑突击冲撞红色残影（二三阶段冲刺时记录位置，旧→新淡出；先画在机体下方）
+  if(b.idx===3&&b.dashTrail&&b.dashTrail.length){
+    for(let i=0;i<b.dashTrail.length;i++){const tp=b.dashTrail[i];
+      ctx.globalAlpha=(i+1)/b.dashTrail.length*0.3;
+      poly([tp.x,tp.y-9,tp.x+5,tp.y+1,tp.x-5,tp.y+1],"#ff3344");}
+    ctx.globalAlpha=1;}
   // 变形动画：五个新Boss播专属变身（mp=进度）；其余通用收缩展开 + 白光衰减
   let ph2=b.phase,sc=1,ox=0,oy=0,flashA=0,mp=null;
   if(b.transT>0){const prog=1-b.transT/70;
@@ -184,7 +190,7 @@ function drawBoss(){
     if(ctx.setLineDash)ctx.setLineDash([4,3]);
     ctx.beginPath();ctx.moveTo(b.x,b.y);ctx.lineTo(G.p.x,G.p.y);ctx.stroke();
     if(ctx.setLineDash)ctx.setLineDash([]);ctx.globalAlpha=1;}
-  // 多管血条：一管蓝/二管红/三管橙，当前管铺在下一管之上，见底锁血转场
+  // 多管血条：一管蓝/二管红/三管橙，当前管铺在下一管之上，见底锁血转场（不画管界刻痕=整管连续无切段）
   const w=160,def2=BOSSES[b.idx],thr=def2.phases===2?[0.5]:[0.66,0.33];
   const TUBEC=["#43b8ff","#e0393e","#ff9a3d"];
   const ratio=clamp(b.hp/b.maxhp,0,1),bx=(W-w)/2;
@@ -192,8 +198,7 @@ function drawBoss(){
   px(bx,10,w,4,b.phase<thr.length?(TUBEC[b.phase+1]||"#3a1020"):"#3a1020"); // 底：下一管或暗底
   const hi=b.phase===0?1:thr[b.phase-1],lo=b.phase<thr.length?thr[b.phase]:0;
   const pc=clamp((ratio-lo)/(hi-lo),0,1);
-  px(bx,10,w*pc,4,TUBEC[b.phase]||b.col);                                     // 当前管
-  for(const tt of thr)px(bx+Math.round(w*tt)-1,9,2,6,"#0d1226");              // 管界刻痕
+  px(bx,10,w*pc,4,TUBEC[b.phase]||b.col);                                     // 当前管（整管连续）
   if(b.transT>0&&G.time%8<4){ctx.strokeStyle="#fff";ctx.lineWidth=1;ctx.strokeRect(bx-2.5,7.5,w+5,9);}
   ctx.font="6px 'Press Start 2P',monospace";ctx.fillStyle="#fff";ctx.textAlign="center";
   ctx.fillText(b.transT>0?b.name:(b.name+" "+Math.ceil(pc*100)+"%"),W/2,22);
diff --git a/star-raid/js/ui.js b/star-raid/js/ui.js
index e6e081c..dbf1c69 100644
--- a/star-raid/js/ui.js
+++ b/star-raid/js/ui.js
@@ -340,15 +340,24 @@ function buildRush(){
   SAVE.rush=SAVE.rush||{};
   const ra=$("rush-anim");   // 老虎机开关（持久化）
   if(ra){ra.checked=!!SAVE.rushAnim;ra.onchange=()=>{SAVE.rushAnim=ra.checked?1:0;persist();};}
+  // 按难度分级分组展示（BOSSES[i].tier：0简单/1中等/2困难/3地狱）
+  const TIERS=[["简单","#5cff9d"],["中等","#ffcf5c"],["困难","#ff9a3d"],["地狱","#ff3355"]];
   const el=$("rush-pick");el.innerHTML="";
-  BOSSES.forEach((b,i)=>{
-    const best=SAVE.rush[i];
-    const d=document.createElement("div");d.className="pcard";
-    d.innerHTML=`<div class="nm" style="margin-top:2px;color:${b.col}">${b.name}${best?" ✓":""}</div>
-      <div class="ds">${b.sub}<br>${best?("最快 "+Math.floor(best/60)+":"+("0"+best%60).slice(-2)):"未击破"}</div>`;
-    d.onclick=()=>startRush(i);
-    el.appendChild(d);
-  });
+  for(let ti=0;ti<4;ti++){
+    const grp=document.createElement("div");grp.className="rush-grp";
+    grp.innerHTML=`<div class="h3" style="color:${TIERS[ti][1]}">— ${TIERS[ti][0]} —</div>`;
+    const row=document.createElement("div");row.className="rush-row";
+    BOSSES.forEach((b,i)=>{
+      if(b.tier!==ti)return;
+      const best=SAVE.rush[i];
+      const d=document.createElement("div");d.className="pcard";
+      d.innerHTML=`<div class="nm" style="margin-top:2px;color:${b.col}">${b.name}${best?" ✓":""}</div>
+        <div class="ds">${b.sub}<br>${best?("最快 "+Math.floor(best/60)+":"+("0"+best%60).slice(-2)):"未击破"}</div>`;
+      d.onclick=()=>startRush(i);
+      row.appendChild(d);
+    });
+    if(row.children.length){grp.appendChild(row);el.appendChild(grp);}
+  }
 }
 function rollRushBuild(){   // 随机武装：3主武Lv3 + 3副武Lv3 + 2僚机Lv2
   const sh=a=>{const x=a.slice();for(let i=x.length-1;i>0;i--){const j=rndi(0,i),t2=x[i];x[i]=x[j];x[j]=t2;}return x;};