:root{--silver:#c0c0c0;--blue:#000080;--paper:#fffff3;--purple:#52168f;--yellow:#ffd900;--ui:Tahoma,"MS Sans Serif",Arial,sans-serif;--mono:"Lucida Console","Courier New",monospace}*{box-sizing:border-box}html,body{height:100%}body{margin:0;overflow:hidden;background:var(--silver);color:#111;font:12px var(--ui)}button,input,select{font:12px var(--ui)}button{cursor:pointer}.app{height:100%;display:grid;grid-template-rows:auto auto 1fr auto}.menu,.toolbar{display:flex;align-items:center;gap:4px;padding:3px 5px;background:var(--silver);border-bottom:1px solid #808080;white-space:nowrap}.menu button{padding:3px 8px;border:0;background:transparent}.menu button:hover{background:var(--blue);color:#fff}.brand{margin-left:auto;font:10px var(--mono)}.toolbar{padding:6px;border-top:1px solid #fff;border-bottom:2px solid #808080;overflow:auto}.btn,.preset,.icon-btn{border:0;border-top:2px solid #fff;border-left:2px solid #fff;border-right:2px solid #404040;border-bottom:2px solid #404040;background:var(--silver)}.btn{min-height:28px;padding:4px 10px}.btn:active,.btn.active,.preset:active,.preset.active,.icon-btn:active{border-color:#404040 #fff #fff #404040;background:#b4b4b4}.btn.primary{font-weight:700;background:var(--yellow)}.btn.danger{color:#900}.sep{width:1px;height:25px;background:#777;border-right:1px solid #fff}.filename{margin-left:auto;font:10px var(--mono)}.workspace{min-width:0;min-height:0;display:grid;grid-template-columns:210px minmax(420px,1fr) 320px;gap:7px;padding:7px;background:#858585}.panel{min-width:0;min-height:0;border:2px outset #fff;background:#d1d1d1}.panel-title{min-height:27px;padding:5px 7px;background:var(--blue);color:#fff;font-weight:700}.presets-panel,.controls{overflow:auto}.preset-list{display:grid;gap:5px;padding:7px}.preset{min-height:34px;padding:5px 7px;text-align:left;background:var(--purple);color:#fff;font:700 10px var(--mono);text-transform:uppercase}.preset.active{background:#271048;color:#fff76b}.preset small{display:block;margin-top:2px;color:#ddd;font-weight:400}.tip{margin:0 7px 8px;padding:8px;border:2px inset #fff;background:var(--paper);font:10px/1.5 var(--mono)}.preview-panel{display:grid;grid-template-rows:auto 1fr auto}.preview-stage{position:relative;min-height:0;display:grid;place-items:center;padding:12px;overflow:hidden;background:#383838;background-image:linear-gradient(45deg,#484848 25%,transparent 25%),linear-gradient(-45deg,#484848 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#484848 75%),linear-gradient(-45deg,transparent 75%,#484848 75%);background-size:18px 18px;background-position:0 0,0 9px,9px -9px,-9px 0}.preview-stage.drag{outline:4px dashed #fff;outline-offset:-8px}.compare-shell{position:relative;max-width:100%;max-height:100%;overflow:hidden;border:2px outset #fff;background:#111;box-shadow:4px 4px rgba(0,0,0,.25);touch-action:none}.compare-shell canvas{display:block;max-width:100%;max-height:calc(100vh - 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