*{box-sizing:border-box;margin:0;padding:0;}
  :root{
    --bg:#101113; --chassis:#1c1d20; --chassis-hi:#26272b; --chassis-lo:#141518;
    --orange:#ff7a00; --orange-dim:#5c3200; --red:#ff3b30; --green:#30d158;
    --text:#d6d8dc; --dim:#6e7178; --oled-bg:#050505; --oled-fg:#e8e8e8; --oled-dim:#555;
  }
  body{background:radial-gradient(1100px 700px at 50% -10%,#232428 0%,var(--bg) 60%,#0a0b0c 100%);min-height:100vh;
    font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--text);display:flex;align-items:flex-start;justify-content:center;padding:28px 14px 80px;}
  .chassis{width:1080px;max-width:100%;background:linear-gradient(160deg,var(--chassis-hi),var(--chassis) 45%,var(--chassis-lo));
    border-radius:20px;padding:24px 26px 20px;border:1px solid #3a3b40;box-shadow:0 28px 55px rgba(0,0,0,.55),inset 0 1px 0 rgba(255,255,255,.07);position:relative;}
  .brand{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:14px;}
  .brand h1{font-size:15px;letter-spacing:5px;color:#fff;font-weight:800;}
  .brand h1 span{color:var(--orange);}
  .brand .sub{font-size:10px;letter-spacing:2px;color:var(--dim);text-transform:uppercase;}
  #oled{background:var(--oled-bg);border-radius:10px;padding:12px 14px;min-height:108px;margin-bottom:16px;
    font-family:"SF Mono",Menlo,Consolas,monospace;font-size:13px;line-height:1.55;color:var(--oled-fg);
    border:1px solid #000;box-shadow:inset 0 0 18px rgba(0,0,0,.9);white-space:pre;position:relative;overflow:hidden;}
  #oled::after{content:"";position:absolute;inset:0;pointer-events:none;background:repeating-linear-gradient(0deg,rgba(255,255,255,.03) 0 1px,transparent 1px 2px);}
  .main{display:flex;gap:18px;margin-bottom:16px;}
  .tracks-col{display:flex;flex-direction:column;gap:6px;}
  .trk-btn{width:64px;height:34px;border-radius:6px;background:linear-gradient(180deg,#2c2e33,#1b1d21);border:1px solid #3c3e44;color:var(--text);
    font-size:10px;letter-spacing:1px;cursor:pointer;box-shadow:0 2px 3px rgba(0,0,0,.5),inset 0 1px 0 rgba(255,255,255,.08);position:relative;font-weight:600;}
  .trk-btn .nm{font-size:8px;color:var(--dim);display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:56px;}
  .trk-btn.on{background:linear-gradient(180deg,#ff9433,#e06900);color:#221000;border-color:#ffb066;}
  .trk-btn .led{position:absolute;top:3px;right:5px;width:6px;height:6px;border-radius:50%;background:#333;}
  .trk-btn.has .led{background:var(--green);box-shadow:0 0 6px var(--green);}
  .steps{flex:1;display:grid;grid-template-columns:repeat(4,1fr);gap:8px;}
  .step-btn{aspect-ratio:1.15;border-radius:8px;background:linear-gradient(180deg,#232428,#141517);border:1px solid #3a3b40;cursor:pointer;
    display:flex;align-items:center;justify-content:center;color:#565a60;font-size:12px;font-family:"SF Mono",Menlo,monospace;position:relative;
    box-shadow:0 2px 4px rgba(0,0,0,.5),inset 0 1px 0 rgba(255,255,255,.06);}
  .step-btn.on{background:linear-gradient(180deg,#ffb54d,#e06e00);color:#2a1400;border-color:#ffc069;box-shadow:0 0 10px rgba(255,122,0,.35);}
  .step-btn.sel{outline:2px solid #fff;outline-offset:1px;}
  .step-btn.cur{outline:1px dashed var(--green);outline-offset:-1px;}
  .step-btn.locked::after{content:"";position:absolute;top:4px;right:4px;width:5px;height:5px;border-radius:50%;background:#7dd3fc;box-shadow:0 0 5px #7dd3fc;}
  .side{display:flex;flex-direction:column;gap:8px;width:170px;}
  .btn{background:linear-gradient(180deg,#2c2e33,#1b1d21);border:1px solid #3c3e44;color:var(--text);border-radius:7px;padding:7px 10px;font-size:10px;letter-spacing:1px;cursor:pointer;text-transform:uppercase;font-weight:600;}
  .btn:hover{filter:brightness(1.15);} .btn:active{transform:translateY(1px);}
  .btn.orange{background:linear-gradient(180deg,#ffb347,#e08a00);color:#241500;border-color:#ffc469;}
  .btn.red{background:linear-gradient(180deg,#ff5c4d,#d62f20);color:#2b0d00;border-color:#ff8a7e;}
  .btn.on{background:linear-gradient(180deg,#ff9433,#e06900);color:#221000;border-color:#ffb066;}
  .grp{display:flex;gap:6px;flex-wrap:wrap;align-items:center;}
  .grp label{font-size:9px;letter-spacing:1px;color:var(--dim);text-transform:uppercase;}
  .kv-row{display:flex;gap:12px;align-items:center;margin-bottom:14px;flex-wrap:wrap;padding:10px 12px;background:#17181b;border-radius:10px;border:1px solid #000;}
  .bank-tabs{display:flex;gap:6px;}
  .tab{padding:6px 10px;border-radius:6px;font-size:10px;letter-spacing:1px;cursor:pointer;background:#202126;border:1px solid #34363c;color:var(--dim);font-weight:600;}
  .tab.on{background:linear-gradient(180deg,#ff9433,#e06900);color:#221000;border-color:#ffb066;}
  .knob-wrap{display:flex;flex-direction:column;align-items:center;gap:2px;}
  .knob{width:54px;height:54px;border-radius:50%;position:relative;cursor:ns-resize;
    background:radial-gradient(circle at 35% 30%,#3d4046,#202125 65%,#121316);box-shadow:0 3px 6px rgba(0,0,0,.6),inset 0 1px 1px rgba(255,255,255,.2);}
  .knob::before{content:"";position:absolute;top:3px;left:50%;width:3px;height:17px;margin-left:-1.5px;border-radius:2px;background:var(--orange);box-shadow:0 0 5px rgba(255,122,0,.55);transform-origin:50% 24px;}
  .knob-label{font-size:9px;letter-spacing:1px;color:var(--dim);text-transform:uppercase;}
  .knob-val{font-size:10px;font-family:"SF Mono",Menlo,monospace;color:var(--orange);min-height:12px;}
  .transport{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:14px;padding:10px 12px;background:#17181b;border-radius:10px;border:1px solid #000;}
  .t-label{font-size:10px;letter-spacing:1px;color:var(--dim);text-transform:uppercase;}
  .bpm-val{font-size:18px;font-family:"SF Mono",Menlo,monospace;color:var(--orange);min-width:56px;text-align:right;}
  input[type=range]{accent-color:var(--orange);width:110px;}
  .footer{display:flex;gap:10px;flex-wrap:wrap;align-items:center;padding-top:6px;}
  .hint{font-size:10px;color:var(--dim);margin-left:auto;text-align:right;line-height:1.6;}
  .dropzone{border:1px dashed #4a4e56;border-radius:8px;padding:8px 12px;font-size:11px;color:var(--dim);cursor:pointer;text-align:center;flex:1;min-width:150px;}
  .dropzone:hover{border-color:var(--orange);color:var(--orange);}
  .status{font-size:10px;font-family:"SF Mono",Menlo,monospace;color:var(--dim);}
  @media (max-width:820px){ .main{flex-direction:column;} .side{width:100%;} }