<!-- RUBY-BACKUP · part 527 -->

        scene.add(pulse);
        /* floating gold orbs above brownstones */
        for(var fo=0; fo<6; fo++){
          var fbx = 100, fbz = -50 + fo*20;
          var fby = 10;
          try{ if(typeof fortifiedGroundY==='function') fby = fortifiedGroundY(fbx, fbz); }catch(e){}
          var orb = new THREE.Mesh(new THREE.SphereGeometry(1.5, 12, 10), holoMat);
          orb.position.set(fbx, fby+18, fbz);
          orb.name = 'future-orb';
          scene.add(orb);
        }
      }catch(e){}
    }, 22000);
    /* SOLID BUILDS — gold arches between pillars */
    setTimeout(function(){
      try{
        var goldMat = new THREE.MeshStandardMaterial({color:0xffd700, metalness:0.8, roughness:0.3});
        for(var ai=0; ai<8; ai++){
          var a1 = (ai/8)*Math.PI*2;
          var a2 = ((ai+1)/8)*Math.PI*2;
          var x1 = Math.cos(a1)*30, z1 = Math.sin(a1)*30;
          var x2 = Math.cos(a2)*30, z2 = Math.sin(a2)*30;
          var mx = (x1+x2)/2, mz = (z1+z2)/2;
          var py = 10;
          try{ if(typeof fortifiedGroundY==='function') py = fortifiedGroundY(mx, mz); }catch(e){}
          /* arch — half torus */
          var arch = new THREE.Mesh(new THREE.TorusGeometry(12, 0.8, 8, 16, Math.PI), goldMat);
          arch.position.set(mx, py+20, mz);
          /* rotate to face center */
          arch.lookAt(0, py+20, 0);
          arch.name = 'solid-arch-'+ai;
          scene.add(arch);
        }
      }catch(e){}
    }, 18000);
    /* DOWNTOWN BORDER — illuminated manuscript border around downtown */
    setTimeout(function(){
      try{
        var goldMat = new THREE.MeshBasicMaterial({color:0xffd700});
        /* double ring with engraved pattern */
        for(var ri=0; ri<2; ri++){
          var radius = 150 + ri*8;
          var rpts = [];
          for(var ra=0; ra<=72; ra++){
            var ang = (ra/72)*Math.PI*2;
            /* scalloped edge — manuscript style */
            var rr = radius + Math.sin(ang*24)*1.5;
            rpts.push(new THREE.Vector3(Math.cos(ang)*rr, 10.4, Math.sin(ang)*rr));
          }
          var rgeo = new THREE.TubeGeometry(new THREE.CatmullRomCurve3(rpts, true), 72, 0.15, 4, true);
          var rmesh = new THREE.Mesh(rgeo, goldMat);
          rmesh.name = 'downtown-border';
          scene.add(rmesh);
        }
      }catch(e){}
    }, 14000);
    /* TOWER MEDALLIONS — banknote engraving, gold on dark */
    setTimeout(function(){
      try{
        var goldMat = new THREE.MeshBasicMaterial({color:0xffd700});
        var darkMat = new THREE.MeshBasicMaterial({color:0x0a0a0a});
        var count = 0;
        if(typeof scene!=='undefined'){
          scene.traverse(function(o){
            if(o.name && o.name.indexOf('downtown')===0 && o.name.indexOf('win')<0 && count < 10){
              var pos = o.position;
              /* dark medallion disc */
              var disc = new THREE.Mesh(new THREE.CircleGeometry(4, 32), darkMat);
              disc.position.set(pos.x, pos.y + 10, pos.z + 5.1);
              disc.name = 'medallion-disc';
              scene.add(disc);
              /* gold spiral — banknote style */
              var spiralPts = [];
              for(var si=0; si<=60; si++){
                var t = si/60;
                var ang = t * Math.PI * 6;
                var r = 0.3 + t * 3.2;
                spiralPts.push(new THREE.Vector3(
                  pos.x + Math.cos(ang)*r,
                  pos.y + 10 + Math.sin(ang)*r,
                  pos.z + 5.2
                ));
              }
              var sgeo = new THREE.TubeGeometry(new THREE.CatmullRomCurve3(spiralPts), 60, 0.05, 4, false);
              var spiral = new THREE.Mesh(sgeo, goldMat);
              spiral.name = 'medallion-spiral';
              scene.add(spiral);
              /* outer ring */
              var ring = new THREE.Mesh(new THREE.TorusGeometry(3.8, 0.08, 8, 32), goldMat);
              ring.position.set(pos.x, pos.y + 10, pos.z + 5.2);
              ring.name = 'medallion-ring';
              scene.add(ring);
              count++;
            }
          });
        }
      }catch(e){}
    }, 10000);
    /* TRAFFIC — cars flowing on the highways */
    (function(){
      try{
        window._traffic = [];
        var carColors = [0xff0000, 0x00ff00, 0x0000ff, 0xffff00, 0xffffff, 0xff8800];
        var carGeo = new THREE.BoxGeometry(3, 1.5, 6);
        if(typeof _highwayPts!=='undefined'){
          _highwayPts.forEach(function(pts, hi){
            for(var ci=0; ci<5; ci++){
              var color = carColors[Math.floor(Math.random()*carColors.length)];
              var mat = new THREE.MeshStandardMaterial({color:color, emissive:color, emissiveIntensity:0.3});
              var car = new THREE.Mesh(carGeo, mat);
              car.name = 'traffic-car';
              /* headlights */
              var hl = new THREE.Mesh(new THREE.SphereGeometry(0.3, 8, 6),
                new THREE.MeshBasicMaterial({color:0xffffcc}));