:root{--bg: #15171a;--panel: #1c1f24;--panel-2: #23272d;--view-bg: #1a1d21;--grid-a: #3a4048;--grid-b: #2a2f35;--border: #343a42;--border-strong: #4a525c;--text: #e4e7eb;--text-dim: #9aa3ad;--accent: #ff8a1f;--accent-text: #1a1204;--accent-soft: rgba(255, 138, 31, .16);--danger: #ff5a52;--danger-soft: rgba(255, 90, 82, .14);--radius: 6px;--h: 30px;--cube: 120px;--cube-face: #2b3038;--cube-edge: #6b7480;--cube-text: #e4e7eb;--cube-corner: #4a525c;color-scheme:dark}@media(prefers-color-scheme:light){:root{--bg: #eceef1;--panel: #f7f8fa;--panel-2: #ffffff;--view-bg: #e3e6ea;--grid-a: #aeb5be;--grid-b: #c9ced5;--border: #cfd4da;--border-strong: #aab1ba;--text: #1d2126;--text-dim: #5d6670;--accent: #e8730a;--accent-text: #ffffff;--accent-soft: rgba(232, 115, 10, .14);--danger: #d12f27;--danger-soft: rgba(209, 47, 39, .1);--cube-face: #ffffff;--cube-edge: #8a939d;--cube-text: #1d2126;--cube-corner: #c3c9d0;color-scheme:light}}*{box-sizing:border-box}html,body{height:100%;margin:0}body{display:flex;flex-direction:column;background:var(--bg);color:var(--text);font:13px/1.4 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;overflow:hidden}.topbar{display:flex;align-items:center;gap:12px;padding:8px 14px;background:var(--panel);border-bottom:1px solid var(--border);flex:none}.topbar h1{font-size:15px;font-weight:650;margin:0;letter-spacing:.02em}.spacer{flex:1}.filename{color:var(--text-dim);max-width:30ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.layout{flex:1;min-height:0;display:flex}.view{position:relative;flex:1;min-width:0;background:var(--view-bg);overflow:hidden}.view canvas{display:block;width:100%;height:100%;touch-action:none}.panel{flex:none;width:320px;overflow-y:auto;background:var(--panel);border-left:1px solid var(--border);padding:4px 14px 16px}@media(max-width:800px){body{overflow:auto}.layout{flex-direction:column}.view{flex:none;height:55vh;min-height:280px}:root{--cube: 96px}.panel{width:auto;border-left:0;border-top:1px solid var(--border);overflow:visible}}.hint,.busy,.msg,.drop-overlay{position:absolute;pointer-events:none;text-align:center}.hint{top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;color:var(--text-dim);font-size:16px;border:2px dashed var(--border-strong);margin:24px;border-radius:12px}.busy{top:12px;left:50%;transform:translate(-50%);background:var(--panel);border:1px solid var(--border-strong);padding:5px 14px;border-radius:999px;color:var(--text)}.msg{bottom:14px;left:14px;right:14px;pointer-events:auto;background:var(--panel);border:1px solid var(--danger);color:var(--danger);padding:8px 12px;border-radius:var(--radius);text-align:left}.drop-overlay{top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;background:var(--accent-soft);border:2px solid var(--accent);color:var(--accent);font-size:16px}[hidden]{display:none!important}.section{border:0;border-bottom:1px solid var(--border);margin:0;padding:12px 0;min-width:0}.section:last-child{border-bottom:0}.section h2,.section legend{font-size:11px;font-weight:650;text-transform:uppercase;letter-spacing:.08em;color:var(--text-dim);margin:0 0 10px;padding:0;float:none;width:100%}fieldset.section>legend{display:block}.note{color:var(--text-dim);font-size:12px;margin:6px 0 0}.row{display:flex;align-items:center;gap:8px;margin:0 0 8px}.row .lbl{flex:none;width:96px;color:var(--text)}.row input[type=range],.row select{flex:1;min-width:0}.btnrow{display:flex;flex-wrap:wrap;gap:6px;margin-top:4px}.refine{margin-top:12px;padding-top:10px;border-top:1px dashed var(--border)}button,select,input[type=number]{font:inherit;color:var(--text);height:var(--h);background:var(--panel-2);border:1px solid var(--border-strong);border-radius:var(--radius);outline:none}button{padding:0 12px;cursor:pointer;white-space:nowrap}button:hover:not(:disabled){border-color:var(--text-dim)}button:active:not(:disabled){background:var(--bg)}button.active{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}button.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-text);font-weight:600}button.primary:hover:not(:disabled){filter:brightness(1.08);border-color:var(--accent)}button.block{width:100%}button.block+button.block{margin-top:6px}select{padding:0 26px 0 8px;-webkit-appearance:none;-moz-appearance:none;appearance:none;cursor:pointer;background-image:linear-gradient(45deg,transparent 50%,var(--text-dim) 50%),linear-gradient(135deg,var(--text-dim) 50%,transparent 50%);background-position:calc(100% - 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