:root{--bg:#07060f;--panel:#12102a;--text:#e9e6ff;--muted:#8c88b8;--accent:#ff2bd6;--accent2:#29f0ff;--tube-w:clamp(34px, 10.5vw, 54px);--tube-h:calc(var(--tube-w) * 3.3)}*{box-sizing:border-box}[hidden]{display:none!important}html,body{min-height:100%;margin:0;overflow-x:hidden}body{background:radial-gradient(ellipse at 20% 0%, #2a0b3d 0%, transparent 55%), radial-gradient(ellipse at 90% 100%, #062a3a 0%, transparent 55%), var(--bg);color:var(--text);-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}button{font:inherit;color:inherit;cursor:pointer;touch-action:manipulation}button:disabled{opacity:.35;cursor:not-allowed}button:focus-visible{outline:2px solid var(--accent2);outline-offset:2px}.topbar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:6px 10px;padding:10px 12px;display:flex}.logo{letter-spacing:.04em;color:var(--accent2);text-shadow:0 0 6px var(--accent2), 0 0 18px #29f0ff88;margin:0;font-size:1.35rem}.logo span{color:var(--accent);text-shadow:0 0 6px var(--accent), 0 0 18px #ff2bd688}.stats{gap:12px;font-size:.95rem;display:flex}.stat b{color:#ffe95a}.top-actions{gap:6px;display:flex}.icon-btn{background:#ffffff0d;border:1px solid #fff2;border-radius:10px;width:38px;height:38px;font-size:1.05rem;position:relative}.icon-btn[aria-pressed=true]{border-color:var(--accent2);box-shadow:0 0 8px #29f0ff88}.badge{color:#021;background:#39ff6a;border-radius:50%;width:17px;height:17px;font-size:.7rem;font-weight:700;line-height:17px;position:absolute;top:-5px;right:-5px;box-shadow:0 0 8px #39ff6a}main{max-width:760px;margin:0 auto;padding:0 8px 24px}.level-info{color:var(--muted);flex-wrap:wrap;justify-content:center;gap:4px 16px;margin:4px 0 8px;font-size:.95rem;display:flex}.level-info #level-title{color:var(--text);font-weight:700}.level-info b{color:var(--text)}.board{min-height:calc(var(--tube-h) + 60px);flex-wrap:wrap;place-content:center;gap:26px 10px;padding:24px 4px 8px;display:flex}.tube-wrap{touch-action:manipulation;background:0 0;border:0;flex-direction:column;align-items:center;gap:4px;padding:0;display:flex}.tube{width:var(--tube-w);height:var(--tube-h);border-radius:0 0 calc(var(--tube-w) / 2) calc(var(--tube-w) / 2);padding:3px 3px calc(var(--tube-w) * .12);background:linear-gradient(90deg,#ffffff10,#ffffff04 40%,#ffffff12);border:2px solid #b9b4ff66;border-top:none;flex-direction:column-reverse;transition:transform .18s,box-shadow .18s,border-color .18s;display:flex;position:relative;overflow:hidden;box-shadow:inset 0 0 10px #ffffff10,0 0 8px #7b6bff33}.tube:before{content:"";background:#b9b4ff55;border-radius:3px;height:4px;position:absolute;top:0;left:-2px;right:-2px}.tube-label{color:var(--muted);font-size:.75rem}.tube-wrap.selected .tube{border-color:var(--accent2);box-shadow:0 0 14px var(--accent2), inset 0 0 10px #29f0ff33;transform:translateY(-16px)}.tube-wrap.solved .tube{border-color:#39ff6aaa;box-shadow:0 0 12px #39ff6a66}.tube-wrap.hint-from .tube{animation:.7s ease-in-out 3 pulse-from}.tube-wrap.hint-to .tube{animation:.7s ease-in-out 3 pulse-to}.tube-wrap.shake .tube{border-color:#ff3b5c;animation:.4s shake}.layer{flex:0 0 calc((var(--tube-h) - var(--tube-w) * .12 - 6px) / 4);background:var(--c);width:100%;box-shadow:0 0 10px var(--c), inset 0 -4px 6px #0003, inset 0 3px 4px #ffffff40;color:#000a;font-weight:900;font-size:calc(var(--tube-w) * .42);justify-content:center;align-items:center;line-height:1;display:flex}.layer:first-child{border-radius:0 0 calc(var(--tube-w) / 2 - 4px) calc(var(--tube-w) / 2 - 4px)}.layer.pop-in{animation:.28s ease-out pop-in}.layer .sym{text-shadow:0 0 2px #fff8;display:none}body.symbols .layer .sym{display:block}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-7px)}40%{transform:translate(7px)}60%{transform:translate(-5px)}80%{transform:translate(5px)}}@keyframes pop-in{0%{opacity:.3;transform:translateY(-40%)scaleY(.6)}to{opacity:1;transform:none}}@keyframes pulse-from{50%{border-color:#ffe95a;transform:translateY(-8px);box-shadow:0 0 22px #ffe95a}}@keyframes pulse-to{50%{border-color:#39ff6a;box-shadow:0 0 22px #39ff6a}}.controls{grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin-top:18px;display:grid}.ctrl{white-space:nowrap;background:#ff2bd612;border:1px solid #ff2bd666;border-radius:12px;padding:10px 6px;font-size:.9rem;box-shadow:0 0 8px #ff2bd633}.ctrl:not(:disabled):active{transform:scale(.97)}.ctrl.primary{border-color:var(--accent2);background:#29f0ff22;box-shadow:0 0 10px #29f0ff66}.count{background:#ffffff1a;border-radius:8px;min-width:1.4em;margin-left:2px;padding:0 4px;font-size:.8rem;display:inline-block}.keys-help{text-align:center;color:var(--muted);margin-top:14px;font-size:.8rem}@media (width<=420px){.controls{grid-template-columns:repeat(2,minmax(0,1fr))}.board{gap:22px 8px}.logo{font-size:1.15rem}}.toast{opacity:0;pointer-events:none;text-align:center;background:#1d1940ee;border:1px solid #29f0ff66;border-radius:12px;max-width:calc(100vw - 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