:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5;--bg: #0c0c14;--surface: #16162a;--surface-hover: #1e1e3a;--border: rgba(255, 255, 255, .08);--accent: #6c5ce7;--accent-light: #a29bfe;--visited: #2d6a4f;--visited-glow: rgba(45, 106, 79, .4);--cube: #fd79a8;--cube-glow: rgba(253, 121, 168, .5);--start: rgba(108, 92, 231, .3);--win: #00cec9;--text: #fafafa;--text-dim: rgba(255, 255, 255, .55)}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100vh;background:var(--bg);color:var(--text)}.app{min-height:100vh;display:flex;flex-direction:column;align-items:center;padding:1.5rem 1rem}.header{text-align:center;margin-bottom:1.5rem}.title{margin:0;font-size:2rem;font-weight:700;letter-spacing:-.03em;background:linear-gradient(135deg,var(--accent-light),var(--cube));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.subtitle{margin:.25rem 0 0;color:var(--text-dim);font-size:.9rem}.game-layout{display:flex;gap:1.5rem;width:100%;max-width:720px;align-items:flex-start}.level-panel{width:140px;flex-shrink:0}.panel-title{margin:0 0 .75rem;font-size:.75rem;text-transform:uppercase;letter-spacing:.15em;color:var(--text-dim)}.level-list{display:flex;flex-direction:column;gap:.35rem}.level-btn{display:flex;flex-direction:column;align-items:flex-start;background:var(--surface);border:1px solid var(--border);border-radius:.5rem;padding:.5rem .65rem;cursor:pointer;transition:all .15s;color:var(--text);font-family:inherit}.level-btn:hover{background:var(--surface-hover);border-color:#ffffff26}.level-btn--active{border-color:var(--accent);background:#6c5ce726}.level-btn--completed .level-btn-name:after{content:" ✓";color:var(--win)}.level-btn-name{font-size:.8rem;font-weight:600}.level-btn-size{font-size:.65rem;color:var(--text-dim);font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.level-btn-best{font-size:.6rem;color:var(--win);margin-top:.1rem}.game-area{flex:1;display:flex;flex-direction:column;align-items:center;gap:.75rem}.status-bar{display:flex;gap:2rem}.stat{display:flex;flex-direction:column;align-items:center}.stat-label{font-size:.65rem;text-transform:uppercase;letter-spacing:.15em;color:var(--text-dim)}.stat-value{font-size:1.25rem;font-weight:700;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.progress-bar-track{width:100%;max-width:400px;height:6px;background:#ffffff0f;border-radius:3px;overflow:hidden}.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--accent),var(--cube));border-radius:3px;transition:width .2s ease}.win-banner{display:flex;align-items:center;gap:1rem;padding:.65rem 1.5rem;background:#00cec91f;border:1px solid rgba(0,206,201,.3);border-radius:.5rem;animation:pop-in .3s ease}.win-text{font-weight:700;color:var(--win);font-size:1.1rem}.win-moves{font-size:.85rem;color:var(--text-dim)}@keyframes pop-in{0%{transform:scale(.9);opacity:0}to{transform:scale(1);opacity:1}}.grid{display:grid;gap:3px;padding:3px;background:#ffffff08;border-radius:.5rem;border:1px solid var(--border);width:100%;max-width:400px;aspect-ratio:auto}.cell{position:relative;aspect-ratio:1;background:var(--surface);border-radius:.3rem;display:flex;align-items:center;justify-content:center;transition:background .15s,box-shadow .15s}.cell--visited{background:var(--visited);box-shadow:inset 0 0 12px var(--visited-glow)}.cell--start{background:var(--start)}.cell--current{background:var(--surface)}.cube{width:65%;height:65%;background:var(--cube);border-radius:.35rem;box-shadow:0 0 16px var(--cube-glow),0 0 4px var(--cube-glow);animation:cube-bounce .15s ease}@keyframes cube-bounce{0%{transform:scale(.7)}50%{transform:scale(1.1)}to{transform:scale(1)}}.start-marker{font-size:.7rem;font-weight:700;color:var(--accent-light);opacity:.5}.controls{display:flex;align-items:center;gap:2rem;margin-top:.5rem}.dpad{display:grid;grid-template-areas:". up ." "left . right" ". down .";gap:4px}.dpad-btn{width:44px;height:44px;background:var(--surface);border:1px solid var(--border);border-radius:.4rem;color:var(--text);font-size:1rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .1s;font-family:inherit}.dpad-btn:hover{background:var(--surface-hover);border-color:#ffffff26}.dpad-btn:active{transform:scale(.92);background:#6c5ce733}.dpad-btn--up{grid-area:up}.dpad-btn--down{grid-area:down}.dpad-btn--left{grid-area:left}.dpad-btn--right{grid-area:right}.action-buttons{display:flex;flex-direction:column;gap:.5rem}.btn{padding:.5rem 1rem;border:1px solid var(--border);border-radius:.4rem;background:var(--surface);color:var(--text);font-size:.8rem;font-weight:600;cursor:pointer;transition:all .15s;font-family:inherit}.btn:hover{background:var(--surface-hover);border-color:#ffffff26}.btn--next{background:#6c5ce733;border-color:var(--accent);color:var(--accent-light)}.btn--next:hover{background:#6c5ce759}.help-text{color:var(--text-dim);font-size:.75rem;text-align:center}.help-text p{margin:0}@media(max-width:600px){.game-layout{flex-direction:column;align-items:center}.level-panel{width:100%}.level-list{flex-direction:row;flex-wrap:wrap;gap:.3rem}.level-btn{flex:0 0 auto;padding:.35rem .5rem}.grid{max-width:320px}.dpad-btn{width:40px;height:40px}.controls{gap:1rem}}