:root{--bg: #0f1218;--panel: #171b24;--panel-border: #2a3142;--text: #e8ecf4;--muted: #8b93a7;--primary: #4f8cff;--accent: #3ecf8e;--danger: #ff6b6b;--btn: #232a3a;--highlight: #f5c542;--stage: #1e2533;--done: #2a4a3a;--active: #3a3a1e}*{box-sizing:border-box}html,body{margin:0;height:100%;background:var(--bg);color:var(--text);font-family:Segoe UI,system-ui,sans-serif}#app{display:grid;grid-template-columns:1fr minmax(300px,380px);height:100vh;overflow:hidden}#cube-canvas{width:100%;height:100%;display:block;cursor:grab;touch-action:none}#cube-canvas:active{cursor:grabbing}.panel{background:var(--panel);border-left:1px solid var(--panel-border);overflow-y:auto;padding:16px 18px 28px;display:flex;flex-direction:column;gap:14px}.panel-header h1{margin:0;font-size:1.4rem;letter-spacing:.04em}.subtitle{margin:4px 0 0;color:var(--muted);font-size:.85rem}.section h2{margin:0 0 8px;font-size:.95rem;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.06em}.hint{margin:0 0 10px;font-size:.8rem;color:var(--muted);line-height:1.45}.btn-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:8px}.btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid var(--panel-border);background:var(--btn);color:var(--text);border-radius:8px;padding:8px 12px;font-size:.85rem;cursor:pointer;transition:background .15s,border-color .15s,opacity .15s}.btn:hover:not(:disabled){background:#2c3548;border-color:#3d4a63}.btn:disabled{opacity:.4;cursor:not-allowed}.btn.primary{background:#2a4a8a;border-color:#3d6cc7}.btn.primary:hover:not(:disabled){background:#355aab}.btn.accent{background:#1f5a42;border-color:#2f8a62}.btn.accent:hover:not(:disabled){background:#287553}.field{display:flex;flex-direction:column;gap:4px;font-size:.8rem;color:var(--muted);flex:1}.field input[type=number]{width:80px;padding:6px 8px;border-radius:6px;border:1px solid var(--panel-border);background:#0f131b;color:var(--text)}.field input[type=range]{width:100%}.moves-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:6px}.moves-grid .btn{padding:8px 0;font-family:ui-monospace,monospace;font-weight:600}.status-box{background:#0f131b;border:1px solid var(--panel-border);border-radius:8px;padding:10px 12px;font-size:.85rem;line-height:1.45;min-height:48px;white-space:pre-wrap}.stage-list{display:flex;flex-direction:column;gap:6px;margin-top:10px}.stage-item{background:var(--stage);border:1px solid var(--panel-border);border-radius:8px;padding:8px 10px;font-size:.8rem}.stage-item.done{background:var(--done);border-color:#3a6a50}.stage-item.active{background:var(--active);border-color:var(--highlight)}.stage-item .stage-title{font-weight:600;margin-bottom:4px}.stage-item .stage-moves{font-family:ui-monospace,monospace;color:var(--muted);word-break:break-word;line-height:1.4}.stage-item .stage-moves .current-move{color:var(--highlight);font-weight:700}.move-sequence{margin-top:10px;font-family:ui-monospace,monospace;font-size:.78rem;line-height:1.55;color:var(--muted);word-break:break-word;max-height:160px;overflow-y:auto;padding:8px;background:#0f131b;border-radius:8px;border:1px solid var(--panel-border)}.move-sequence .done-move{color:#6a9a7a}.move-sequence .current-move{color:var(--highlight);font-weight:700;text-decoration:underline}.meta{margin-top:auto}.meta p{margin:0 0 4px;font-size:.75rem;color:var(--muted)}@media(max-width:900px){#app{grid-template-columns:1fr;grid-template-rows:55vh 1fr}.panel{border-left:none;border-top:1px solid var(--panel-border)}}