*{margin:0;padding:0;box-sizing:border-box}:root{--rack-bg: #1a1a1a;--panel-bg: #2a2a2a;--panel-surface: linear-gradient(145deg, #333333 0%, #2a2a2a 50%, #252525 100%);--brushed-metal: linear-gradient(90deg, #3a3a3a 0%, #404040 10%, #3a3a3a 20%, #404040 30%, #3a3a3a 40%, #404040 50%, #3a3a3a 60%, #404040 70%, #3a3a3a 80%, #404040 90%, #3a3a3a 100%);--screw-color: #555;--text-primary: #e0e0e0;--text-label: #999;--text-value: #00ff88;--led-on: #00ff44;--led-off: #003300;--led-red: #ff2200;--led-red-off: #330000;--knob-body: #444;--knob-indicator: #fff;--meter-bg: #111;--meter-green: #00cc44;--meter-yellow: #cccc00;--meter-red: #cc0000;--lcd-bg: #0a1a0a;--lcd-text: #00ff66;--border-inset: #1a1a1a;--border-raised: #444;--accent: #4488ff}html,body{height:100%;background:#111;color:var(--text-primary);font-family:Courier 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#00000080}.rack-screw:after{content:"+";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:10px;color:#555;line-height:1}.rack-screw.tl{top:8px;left:-22px}.rack-screw.bl{bottom:8px;left:-22px}.rack-screw.tr{top:8px;right:-22px}.rack-screw.br{bottom:8px;right:-22px}.rack-panel{background:var(--panel-surface);border:1px solid #444;border-radius:3px;box-shadow:inset 0 1px 3px #0006;padding:10px}.panel-row{display:flex;gap:8px;align-items:stretch}.panel-label{font-size:.55rem;color:var(--text-label);text-transform:uppercase;letter-spacing:1.5px;text-align:center;margin-bottom:4px;font-weight:700}.panel-section-label{font-size:.65rem;color:var(--text-label);text-transform:uppercase;letter-spacing:2px;text-align:center;padding:4px 0;border-bottom:1px solid #333;margin-bottom:6px}.engraved{color:transparent;text-shadow:0 1px 1px 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0}.io-unit-label{font-size:.7rem;font-weight:700;letter-spacing:3px;text-transform:uppercase;color:var(--text-label);min-width:80px;text-align:center;text-shadow:0 1px 1px rgba(0,0,0,.5)}.io-configure-btn{padding:4px 12px;background:linear-gradient(180deg,#444,#333);border:1px solid #555;border-radius:3px;color:var(--text-primary);font-family:inherit;font-size:.55rem;letter-spacing:1.5px;text-transform:uppercase;cursor:pointer;box-shadow:0 1px 3px #0006;white-space:nowrap;transition:background .1s}.io-configure-btn:hover{background:linear-gradient(180deg,#555,#444)}.io-configure-btn:active{box-shadow:inset 0 1px 3px #0006}.io-unit-meter{flex:1;min-width:0}.io-unit-meter canvas{width:100%;height:18px}.io-unit-db{font-size:.6rem;font-family:Courier New,monospace;color:var(--lcd-text);background:var(--lcd-bg);padding:2px 6px;border-radius:2px;border:1px solid #1a3a1a;min-width:60px;text-align:right;white-space:nowrap}