:root{--panel:rgba(255,255,255,.86);--edge:rgba(0,0,0,.5);--text:#11131a;--muted:#4f5560;--primary:#d9e0ff;--solve:#d9f1dd;--shadow:rgba(0,0,0,.72)}*{box-sizing:border-box}html,body{width:100%;height:100%;margin:0;overflow:hidden;background:#0a0a14;color:var(--text);font-family:Inter,Segoe UI,Arial,sans-serif}button,input,select{font:inherit}.app,#scene{position:fixed;inset:0;width:100%;height:100%}#scene{touch-action:none;cursor:default}.toolbar{position:fixed;z-index:20;top:max(10px,env(safe-area-inset-top));left:max(10px,env(safe-area-inset-left));display:flex;align-items:center;gap:18px;padding:9px 11px;border:1px solid var(--edge);border-radius:12px;background:rgba(255,255,255,.8);box-shadow:0 0 12px var(--shadow);backdrop-filter:blur(8px)}h1,h2,h3{margin:0;font-weight:700}h1{font-size:clamp(1.2rem,2.5vw,1.85rem)}h2{font-size:1.08rem}h3{margin-bottom:9px;font-size:.78rem;letter-spacing:.09em;text-transform:uppercase;color:#333947}.eyebrow{display:block;margin-bottom:2px;color:#525a78;font-size:.65rem;letter-spacing:.12em;text-transform:uppercase}.toolbar-actions{display:flex;gap:6px}.button,.icon-button{border:1px solid #8b909c;border-radius:5px;background:#eef0f4;color:#171a21;padding:.5rem .68rem;cursor:pointer;box-shadow:0 2px 0 rgba(0,0,0,.26);transition:background .12s,transform .12s,border-color .12s}.button:hover,.button:focus-visible,.icon-button:hover,.icon-button:focus-visible{background:#fff;border-color:#303642;outline:none}.button:active,.icon-button:active{transform:translateY(1px);box-shadow:0 1px 0 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9px;border-radius:6px;background:rgba(255,255,255,.7);font-size:.7rem;color:#262b34;pointer-events:none;white-space:nowrap}.controls.open~.instructions{display:none}@media(max-width:900px){.toolbar{right:8px;left:8px;justify-content:space-between;gap:8px}.toolbar-actions{gap:4px}.toolbar .button{padding:.44rem .5rem;font-size:.76rem}.toolbar .eyebrow{display:none}.controls{top:auto;bottom:0;width:100%;height:auto;max-height:70dvh;padding:13px 13px calc(54px + env(safe-area-inset-bottom));border-top:1px solid rgba(0,0,0,.3);border-left:0;transform:translateY(105%)}.controls.open{transform:none}.status{right:8px;bottom:max(6px,env(safe-area-inset-bottom));justify-content:center}.instructions{display:none}}@media(max-width:600px){h1{font-size:1.02rem}.toolbar{padding:7px}.toolbar-actions #stepButton,.toolbar-actions #resetButton,.toolbar-actions #solveButton{display:none}.toolbar-actions .button{padding:.4rem 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