:root{--bg:#f4f4f6;--panel:#fff;--panel-2:#f8f8fa;--border:#e3e3e8;--text:#1f1f24;--muted:#6b6b75;--accent:#06f;--accent-soft:#e8f0ff;--danger:#a32b1f;--warn:#7a4d00;--shadow:0 4px 16px #0000000f;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}html,body{background:var(--bg);height:100%;color:var(--text);margin:0;padding:0;overflow:hidden}#app{grid-template-columns:340px 1fr;width:100%;height:100vh;display:grid}#sidebar{background:var(--panel);border-right:1px solid var(--border);flex-direction:column;display:flex;overflow:hidden auto}#sidebar>*{border-bottom:1px solid var(--border);padding:14px 16px}#sidebar>footer{color:var(--muted);border-bottom:none;margin-top:auto;font-size:12px}#sidebar h1{margin:0;font-size:17px;font-weight:600}#sidebar h2{color:var(--muted);text-transform:uppercase;letter-spacing:.5px;margin:0 0 8px;font-size:11px;font-weight:600}.tagline{color:var(--muted);margin:4px 0 0;font-size:12px}.tagline 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summary{display:none}.tree-row::-webkit-details-marker{display:none}details>summary.tree-row{list-style:none}details>summary.tree-row::-webkit-details-marker{display:none}.tree-label{font:inherit;text-align:left;cursor:pointer;text-overflow:ellipsis;white-space:nowrap;background:0 0;border:0;flex:1;padding:0;overflow:hidden}.tree-label:hover{color:var(--accent)}.tree-count{color:var(--muted);background:var(--panel-2);border-radius:8px;padding:1px 6px;font-size:10px}.selection-info{color:var(--muted);font-size:12px;line-height:1.5}.selection-info strong{color:var(--text)}.selection-info dl{grid-template-columns:auto 1fr;gap:4px 10px;margin:0;display:grid}.selection-info dt{color:var(--muted)}.selection-info dd{color:var(--text);margin:0}#viewport{background:var(--bg);position:relative}#renderCanvas{touch-action:none;outline:none;width:100%;height:100%;display:block}.progress{box-shadow:var(--shadow);background:#fffffff2;border-radius:10px;align-items:center;gap:12px;padding:14px 22px;font-size:13px;display:flex;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.progress[hidden]{display:none!important}.spinner{border:2px solid var(--accent-soft);border-top-color:var(--accent);border-radius:50%;width:18px;height:18px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.toast-container{pointer-events:none;flex-direction:column;gap:8px;max-width:360px;display:flex;position:absolute;bottom:20px;right:20px}.toast{color:#fff;box-shadow:var(--shadow);pointer-events:auto;background:#14141eeb;border-radius:6px;padding:10px 14px;font-size:13px;animation:.2s ease-out toast-in}.toast.toast--error{background:var(--danger)}.toast.toast--warn{background:var(--warn)}@keyframes toast-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.foot a{color:var(--muted)}.foot a:hover{color:var(--accent)}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:3px}.file-button:focus-within{outline:2px solid var(--accent);outline-offset:2px}#renderCanvas:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}#renderCanvas.pointer-focus:focus-visible{outline:none}input[type=range]:disabled{opacity:.45;cursor:not-allowed}.slider:has(input:disabled){color:var(--muted)}@media (max-width:640px){#app{grid-template-rows:auto 1fr;grid-template-columns:1fr;width:100%}#sidebar{border-right:0;border-bottom:1px solid var(--border);max-height:55vh;overflow-y:auto}}.lab-back{min-height:44px;color:var(--accent);text-underline-offset:3px;align-items:center;margin-bottom:5px;font-weight:650;display:inline-flex}.lab-help{color:var(--muted);margin:0;font-size:12px;line-height:1.45}@media (prefers-reduced-motion:reduce){.spinner,.toast{animation:none}}