:root{--canvas-background:#224;--accent:#336;font-family:Arial,Helvetica,sans-serif}body{margin:0;padding:8px}.rows{flex-flow:column;align-items:stretch;gap:8px;max-width:800px;display:flex}.errors,.warnings{margin:0;padding:0 0 0 1.2em}:is(.errors,.warnings)>li{white-space-collapse:preserve-breaks}.errors{color:#c00}.errors>li::marker{content:"🗲 "}.warnings{color:#aa0}.warnings>li::marker{content:"⚠ "}.flex-row{flex-wrap:wrap;align-items:center;column-gap:1em;display:flex}input{accent-color:var(--accent);margin:0}button,select{background-color:var(--accent);color:#fff;border:none;border-radius:3px;margin:0;padding:2px 4px 3px}:is(button,select):hover{opacity:.8}button,select{font-family:inherit;font-size:100%}select{padding-right:0}label{align-items:center;gap:.25em;display:flex}summary{cursor:pointer;text-decoration:underline}summary:hover{opacity:.6}canvas{background-color:var(--canvas-background);width:800px;height:800px}