:root{--bg: #0e1116;--panel: #161b22;--text: #e6edf3;--muted: #9aa4af;--accent: #7dd3fc}*{box-sizing:border-box}html,body{height:100%}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--text);background:var(--bg)}.app{display:grid;grid-template-columns:340px 1fr;height:100vh}.sidebar{padding:16px;background:var(--panel);border-right:1px solid #222a33;overflow:auto}h1{margin:0 0 12px;font-size:20px}.group{border:1px solid #283041;padding:10px;margin:12px 0;border-radius:6px}.group legend{padding:0 6px;color:var(--muted)}.field{display:grid;gap:6px;margin:10px 0}.field span{font-size:13px;color:var(--muted)}.field input[type=range],.field select,.field input[type=number]{width:100%}.field.check{display:flex;align-items:center;gap:8px}.help{margin-top:12px;font-size:12px;color:var(--muted)}.readout{margin-top:8px;font-size:12px;color:var(--muted);display:grid;gap:2px}.stage{position:relative}.layer{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;display:block}.overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;color:#cbd5e1;pointer-events:none;font-size:14px;opacity:.7}