*{box-sizing:border-box;margin:0;padding:0}html,body{min-height:100%;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;overscroll-behavior:none;touch-action:manipulation}#app{min-height:100%;display:flex;align-items:flex-start;justify-content:center;padding:16px}.game{width:min(94vw,480px);display:flex;flex-direction:column;gap:12px;--tube-edge: rgba(24, 18, 12, .34);--tube-body: #d7cdbf;--tube-gloss: rgba(255, 255, 255, .62);--liquid: #17b3dd;--liquid-lite: #8ceaff;--liquid-glow: #37d2ff;--src-a: #6fd07a;--src-b: #3f9a54;--out-a: #f2b25c;--out-b: #cf7a2f;--panel-a: #c7b8a9;--panel-b: #b3a293;--panel-line: rgba(255, 255, 255, .16);--socket: #d9cec1;--socket-shadow: rgba(40, 30, 22, .28)}@media(prefers-color-scheme:dark){:root:not([data-theme=light]) .game{--tube-edge: rgba(0, 0, 0, .55);--tube-body: #94897a;--tube-gloss: rgba(255, 255, 255, .42);--panel-a: #574c41;--panel-b: #443a30;--panel-line: rgba(255, 255, 255, .08);--socket: #5a4f44;--socket-shadow: rgba(0, 0, 0, .5)}}:root[data-theme=dark] .game{--tube-edge: rgba(0, 0, 0, .55);--tube-body: #94897a;--tube-gloss: rgba(255, 255, 255, .42);--panel-a: #574c41;--panel-b: #443a30;--panel-line: rgba(255, 255, 255, .08);--socket: #5a4f44;--socket-shadow: rgba(0, 0, 0, .5)}.crumb{font-size:14px}.crumb a{color:var(--accent);text-decoration:none;font-weight:700}.crumb a:hover{text-decoration:underline}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.title{font-size:clamp(30px,8.5vw,44px);font-weight:800;line-height:1;letter-spacing:-1px}.sizes{display:flex;gap:8px}.size{flex:1;background:var(--surface);color:var(--text);border:2px solid var(--line);border-radius:6px;padding:11px 6px;font-size:14px;font-weight:700;cursor:pointer;transition:border-color .12s ease,background .12s 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var(--liquid-glow))}}.btn{background:var(--accent);color:var(--accent-text);border:none;border-radius:6px;padding:10px 16px;font-size:14px;font-weight:700;cursor:pointer;white-space:nowrap;transition:filter .12s ease}.btn:hover{filter:brightness(1.05)}.btn:active{filter:brightness(.95)}.overlay{position:absolute;inset:0;border-radius:14px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;text-align:center;padding:20px;background:var(--overlay-bg);z-index:10;opacity:0;pointer-events:none;transition:opacity .2s ease}.overlay.show{opacity:1;pointer-events:auto}.overlay .msg{font-size:clamp(28px,9vw,44px);font-weight:800}.overlay.win .msg{color:var(--liquid);text-shadow:0 0 18px var(--liquid-glow)}.overlay .sub{font-size:15px;color:var(--text);opacity:.9}.overlay .actions{display:flex;gap:10px;margin-top:8px}.how{font-size:13px;opacity:.85;line-height:1.5}.how b{font-weight:700}@media(prefers-reduced-motion:reduce){.tile.spin 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