:root{--bg: #0b0c10;--bg-soft: #14161d;--panel: #181b23;--line: #262a35;--text: #eef1f6;--muted: #99a2b2;--accent: #5b8cff;--solve: #1bbf5a;--shadow: 0 24px 60px rgba(0, 0, 0, .45);--radius: 14px}*{box-sizing:border-box}html,body{margin:0;height:100%;overflow:hidden;overscroll-behavior:none}body{background:radial-gradient(1100px 700px at 50% -10%,#1b2030 0%,transparent 60%),var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased}#app{height:100%}.wrap{height:100%;max-width:760px;margin:0 auto;padding:18px 20px 22px;display:flex;flex-direction:column;align-items:center;overflow:hidden}.top{text-align:center;margin-bottom:6px}.top h1{font-size:clamp(1.8rem,5vw,2.6rem);font-weight:700;letter-spacing:-.02em;margin:0}.accent{color:var(--accent)}.tag{margin:8px 0 0;color:var(--muted);font-size:.95rem}.stage{position:relative;width:100%;flex:1 1 auto;min-height:0;margin:8px 0 4px;touch-action:none;cursor:grab;-webkit-user-select:none;user-select:none;overflow:hidden;border-radius:var(--radius)}.stage:active{cursor:grabbing}.stage.working{cursor:progress}.cube-canvas{display:block;width:100%!important;height:100%!important}.hint{flex:0 0 auto;margin:0 0 12px;font-size:.78rem;color:var(--muted);text-align:center;pointer-events:none;transition:opacity .4s ease}.hint.gone{opacity:0}.hud{display:flex;gap:10px;margin-bottom:14px}.pill{font-size:.82rem;font-weight:600;padding:6px 14px;border-radius:999px;background:var(--panel);border:1px solid var(--line)}.pill.ghost{color:var(--muted);font-weight:500}.pill.ok{color:var(--solve);border-color:#1bbf5a66}.pill.flash{animation:flash .6s ease}@keyframes flash{0%{transform:scale(1)}40%{transform:scale(1.12)}to{transform:scale(1)}}.controls{width:100%;flex:0 0 auto;display:flex;flex-direction:column;align-items:center;gap:14px}.faces{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;width:100%;max-width:460px}.fgroup{display:flex;flex-direction:column;gap:6px}.btn{font-family:inherit;font-weight:600;color:var(--text);background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:10px 14px;cursor:pointer;transition:transform .12s ease,background .15s ease,border-color .15s ease}.btn:hover{background:#20242e;border-color:#333a48}.btn:active{transform:translateY(1px) scale(.98)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn.face{padding:12px 0;font-size:1.05rem;text-align:center}.btn.face.prime{font-size:.92rem;color:var(--muted);padding:8px 0}.actions{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}.btn.primary{background:var(--accent);border-color:transparent;color:#06122e}.btn.primary:hover{background:#6f9bff}.btn.solve{background:var(--solve);border-color:transparent;color:#042611}.btn.solve:hover{background:#2bd56b}.keys{margin:0;font-size:.8rem;color:var(--muted);text-align:center}.keys b{color:var(--text);font-weight:600}@media(max-width:480px){.stage{height:300px}.btn.face{padding:10px 0;font-size:.95rem}}