:root{--bg: #0f1216;--bg-panel: #171b21;--bg-elevated: #1e242c;--border: #2a323c;--text: #e6e9ee;--text-dim: #8b95a3;--accent: #4f9cf7;--accent-dim: #2c5f9e;--danger: #e5484d;--radius: 8px;--shadow: 0 4px 16px rgba(0, 0, 0, .35)}*{box-sizing:border-box;margin:0;padding:0}html,body,#app{height:100%}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:14px;line-height:1.5;overflow:hidden}#app{display:flex;flex-direction:column}.app-header{display:flex;align-items:baseline;gap:12px;padding:12px 20px;background:var(--bg-panel);border-bottom:1px solid var(--border);flex-shrink:0}.app-header h1{font-size:18px;font-weight:600;letter-spacing:.2px}.app-header .subtitle{color:var(--text-dim);font-size:13px}.app-main{flex:1;display:flex;min-height:0}#scene-container{flex:1;min-width:0;position:relative}.view-bar{position:absolute;top:12px;left:12px;display:flex;gap:6px;z-index:10}.view-bar button{padding:5px 12px;font-size:12px}.sidebar{width:300px;flex-shrink:0;background:var(--bg-panel);border-left:1px solid var(--border);padding:16px;overflow-y:auto}.sidebar h2{font-size:14px;font-weight:600;text-transform:uppercase;letter-spacing:.6px;color:var(--text-dim);margin-bottom:12px}.sidebar .group{margin-bottom:20px}.slider-row{display:flex;align-items:center;gap:10px;margin-bottom:10px}.slider-row label{flex:1;color:var(--text)}.slider-row output{width:44px;text-align:right;color:var(--text-dim);font-variant-numeric:tabular-nums}.slider-row.morph-only{opacity:.55}.slider-row.morph-only label{font-style:italic}.slider-hint{font-size:12px;color:var(--text-dim);margin-bottom:12px}.mask-overlay{position:absolute;top:0;right:0;bottom:0;left:0;z-index:20;display:flex;flex-direction:column;background:#101216;color:var(--text)}.mask-head{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;border-bottom:1px solid var(--border)}.mask-step{color:var(--text-dim);font-size:13px}.mask-canvas{flex:1;width:100%;min-height:0;cursor:crosshair;touch-action:none}.mask-hint{text-align:center;padding:6px;color:var(--text-dim);font-size:12px}.mask-foot{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:10px 14px;border-top:1px solid var(--border)}.mask-nav{display:flex;gap:6px}input[type=range]{width:100%;accent-color:var(--accent);cursor:pointer}button{width:100%;padding:10px 14px;border:1px solid var(--accent-dim);border-radius:var(--radius);background:var(--accent);color:#fff;font-size:14px;font-weight:600;cursor:pointer;transition:background .15s ease,transform .05s ease}button:hover{background:var(--accent-dim)}button:active{transform:translateY(1px)}button.secondary{background:transparent;color:var(--text);border-color:var(--border)}button.secondary:hover{background:var(--bg-elevated)}button:disabled{opacity:.5;cursor:not-allowed}.status{margin-top:12px;padding:8px 12px;border-radius:var(--radius);font-size:13px;color:var(--text-dim);background:var(--bg-elevated);border:1px solid var(--border)}.status.error{color:var(--danger);border-color:var(--danger)}.hidden{display:none!important}