body.game-active{position:fixed;inset:0;width:100%;height:100dvh;overflow:hidden;overscroll-behavior:none;background:linear-gradient(#99dcf7 0 43%,#eef8e8 43% 100%)}body.game-active #app{position:absolute;inset:0;width:100%;height:100%;overflow:hidden}.game-shell{width:100%;height:100%;padding:10px;display:flex;align-items:center;justify-content:center;overflow:hidden}.game-frame{width:max-content;max-width:calc(100vw - 20px);max-height:100%;display:flex;flex-direction:column;gap:9px;margin:auto}.game-topbar{width:100%;min-height:70px;display:grid;grid-template-columns:48px 1fr 48px;align-items:center;gap:10px;padding:8px 12px;border:1px solid rgba(25,126,157,.18);border-radius:20px;background:linear-gradient(100deg,#1699ce,#20a99d);box-shadow:0 10px 24px rgba(18,86,105,.12)}.game-topbar>div{text-align:center;color:#fff}.game-topbar .eyebrow{color:#e0f8ff}.game-topbar h1{margin:2px 0;font-size:clamp(1.8rem,3vw,2.6rem);line-height:1}.game-topbar .icon-btn:last-child{justify-self:end}.puzzle-frame,.arcade-frame,.mini-frame{width:calc(170px + var(--board-size) + 216px + 24px)}
.puzzle-hud-row{width:min(480px,100%);align-self:center;display:grid;grid-template-columns:repeat(3,1fr);gap:6px}.puzzle-hud-row>div{padding:7px 10px;border:1px solid var(--line);border-radius:13px;background:#fff;box-shadow:var(--shadow-soft)}.puzzle-hud-row span{display:block;font-size:.51rem;letter-spacing:.12em;color:#168b9b;font-weight:900;text-transform:uppercase}.puzzle-hud-row b{display:block;margin-top:2px;font-size:.95rem}
.board-wrap{position:relative;width:var(--board-size);height:var(--board-size);flex:0 0 auto}.game-board{width:var(--board-size);height:var(--board-size);display:grid;grid-template-columns:repeat(var(--cols,8),minmax(0,1fr));grid-template-rows:repeat(var(--rows,8),minmax(0,1fr));gap:2px;padding:6px;border:4px solid #3f6872;border-radius:16px;background:var(--board);box-shadow:0 10px 26px rgba(29,73,82,.13)}.arcade-board{--cols:8;--rows:8}.tile,.a-tile{position:relative;min-width:0;min-height:0;border:1px solid rgba(77,121,69,.10);border-radius:9px;background:var(--cell);display:grid;place-items:center;overflow:hidden;padding:2px}.tile.empty,.a-tile.empty{background:var(--cell)}.tile.pipe,.a-tile.pipe{background:linear-gradient(145deg,#e7f2e1,#d9e9ce);overflow:visible;padding:0;z-index:2}.tile.source,.tile.target,.a-tile.source,.a-tile.target{background:linear-gradient(145deg,#e8f3d9,#d6e9bd)}.tile.obstacle,.a-tile.obstacle{background:linear-gradient(145deg,#dfead6,#d4e2cb)}.tile.connected,.a-tile.flowing,.a-tile.supplied{box-shadow:inset 0 0 0 2px rgba(34,186,218,.32);background:linear-gradient(145deg,#e7f7dc,#d6f0c5)}.tile button,.a-tile{border:0}.place-cell{color:#6ba174}.place-plus{font-size:1.05rem;opacity:.10}.place-cell.ready{cursor:pointer;box-shadow:inset 0 0 0 2px rgba(27,163,156,.20)}.drag-targeting .place-cell{box-shadow:inset 0 0 0 2px rgba(28,174,161,.30)}.drag-targeting .place-cell:hover{background:#f0f7cf;box-shadow:inset 0 0 0 3px #e8bf4b}.pipe-rotate{position:absolute;inset:0;width:100%;height:100%;padding:0;border:0;background:transparent;overflow:visible}.return-pipe{position:absolute;right:2px;bottom:2px;z-index:4;width:20px;height:20px;border:1px solid var(--line-strong);border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,.94)}.return-pipe img{width:13px;height:13px}.lock{position:absolute;right:3px;bottom:3px;width:16px;height:16px}.lock img{width:100%;height:100%}.tile small{position:absolute;left:3px;right:3px;bottom:2px;font-size:.43rem;line-height:1;text-align:center;font-weight:900;color:#365d6c;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.obstacle-img{width:62%;height:62%;object-fit:contain}.flow-flash{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%) scale(.92);opacity:0;pointer-events:none;z-index:10;padding:9px 13px;border-radius:999px;background:rgba(9,64,90,.92);color:#fff;font-weight:900;letter-spacing:.08em;transition:.18s ease}.flow-flash.show{opacity:1;transform:translate(-50%,-50%) scale(1)}
.pipe-piece{width:100%;height:100%;display:grid;place-items:center;transform:rotate(var(--pipe-rot,0deg));transform-origin:center;will-change:transform}.pipe-svg-art{width:100%;height:100%;overflow:visible;filter:drop-shadow(0 4px 5px rgba(24,72,57,.20))}.pipe-route{fill:none;stroke-linecap:round;stroke-linejoin:round}.pipe-shadow{stroke:#123e2d;stroke-width:48;opacity:.24}.pipe-body{stroke:url(#pipeBodyGrad);stroke-width:42}.pipe-bevel{stroke:url(#pipeBevelGrad);stroke-width:34}.pipe-cavity{stroke:#164e3d;stroke-width:24;opacity:.96}.pipe-channel{stroke-width:16}.pipe-channel.dry{stroke:url(#dryGrad);opacity:.90}.pipe-channel.wet{stroke:url(#waterGrad);filter:url(#waterGlow)}.pipe-water-flow{stroke:rgba(235,254,255,.95);stroke-width:5;stroke-dasharray:8 13;filter:url(#waterGlow);animation:waterTravel .62s linear infinite}.pipe-highlight{stroke:rgba(224,255,201,.72);stroke-width:6;opacity:.62;transform:translate(-2px,-3px)}.pipe-collar-shadow,.pipe-junction-shadow{fill:rgba(17,59,43,.24)}.pipe-collar,.pipe-junction-body{stroke:#155a37;stroke-width:2.2}.pipe-collar-bevel,.pipe-junction-bevel{stroke:rgba(224,255,206,.42);stroke-width:1.4}.pipe-mouth,.pipe-junction-core{stroke:#154a3b;stroke-width:1.5}.pipe-collar-gloss{fill:none;stroke:rgba(239,255,224,.78);stroke-width:2.5;stroke-linecap:round}.pipe-piece.flowing .pipe-svg-art{filter:drop-shadow(0 0 7px rgba(30,209,255,.32)) drop-shadow(0 4px 5px rgba(24,72,57,.16));animation:flowPulse 1.4s ease-in-out infinite}.endpoint-piece{width:100%;height:100%;display:grid;place-items:center}.endpoint-svg-art{width:90%;height:90%;overflow:visible;filter:drop-shadow(0 3px 5px rgba(29,68,84,.13))}.source-piece.active .endpoint-svg-art{filter:drop-shadow(0 0 9px rgba(42,198,234,.44));animation:sourcePulse 1.25s ease-in-out infinite}.building-piece.active .endpoint-svg-art{filter:drop-shadow(0 0 9px rgba(42,198,234,.36));animation:destinationSupplied .75s ease both}
@keyframes waterTravel{to{stroke-dashoffset:-21}}
@keyframes flowPulse{0%,100%{filter:drop-shadow(0 0 5px rgba(30,209,255,.24)) drop-shadow(0 4px 5px rgba(24,72,57,.16))}50%{filter:drop-shadow(0 0 10px rgba(30,209,255,.44)) drop-shadow(0 4px 5px rgba(24,72,57,.14))}}
@keyframes sourcePulse{0%,100%{transform:scale(1)}50%{transform:scale(1.035)}}
@keyframes destinationSupplied{0%{transform:scale(.92)}55%{transform:scale(1.08)}100%{transform:scale(1)}}
@keyframes pipePlacePop{0%{transform:rotate(var(--pipe-rot,0deg)) scale(.45);opacity:.2}65%{transform:rotate(var(--pipe-rot,0deg)) scale(1.10);opacity:1}100%{transform:rotate(var(--pipe-rot,0deg)) scale(1)}}
@keyframes pipeRotateKick{0%{transform:rotate(calc(var(--pipe-rot,0deg) - 90deg)) scale(.96)}70%{transform:rotate(var(--pipe-rot,0deg)) scale(1.04)}100%{transform:rotate(var(--pipe-rot,0deg)) scale(1)}}
@keyframes obstacleSpawn{0%{transform:scale(.45) rotate(-10deg);opacity:.2}65%{transform:scale(1.12) rotate(4deg);opacity:1}100%{transform:scale(1) rotate(0)}}
@keyframes tileRemove{0%{transform:scale(1);opacity:1}100%{transform:scale(.55);opacity:.25}}
.action-place .pipe-piece,.action-spawn .pipe-piece{animation:pipePlacePop .34s cubic-bezier(.2,.9,.2,1.18)}.action-rotate .pipe-piece{animation:pipeRotateKick .24s ease-out}.action-spawn-obstacle .obstacle-img{animation:obstacleSpawn .38s cubic-bezier(.2,.9,.2,1.15)}.action-clear{animation:tileRemove .24s ease-out}.random-selected{animation:spawnTargetPulse .66s ease-in-out infinite alternate}@keyframes spawnTargetPulse{from{box-shadow:inset 0 0 0 2px rgba(255,196,56,.25)}to{box-shadow:inset 0 0 0 4px rgba(255,196,56,.78);background:#f7f2c4}}
@media(prefers-reduced-motion:reduce){.pipe-water-flow,.pipe-piece.flowing .pipe-svg-art,.source-piece.active .endpoint-svg-art,.building-piece.active .endpoint-svg-art,.action-place .pipe-piece,.action-spawn .pipe-piece,.action-rotate .pipe-piece,.action-spawn-obstacle .obstacle-img,.random-selected{animation:none!important}}
.mode-rail{min-width:0;height:var(--board-size);display:flex;flex-direction:column;gap:8px}.rail-card{padding:11px;border:1px solid var(--line);border-radius:15px;background:#fff;box-shadow:var(--shadow-soft);min-width:0}.rail-card>span,.rail-label{display:block;font-size:.55rem;letter-spacing:.12em;text-transform:uppercase;color:#168b9b;font-weight:900}.rail-card>b{display:block;margin:4px 0;font-size:.9rem}.rail-card small{display:block;color:var(--muted);font-size:.65rem;line-height:1.35}.rail-title{display:flex;align-items:center;gap:6px;color:#168b9b;font-size:.61rem;font-weight:900;text-transform:uppercase;letter-spacing:.08em}.rail-title img{width:19px;height:19px}.stat-card b{font-size:1.2rem}.rail-stars{font-size:1.15rem;color:#e0aa27;letter-spacing:.04em}.puzzle-layout{display:grid;grid-template-columns:170px var(--board-size) 216px;gap:12px;align-items:start}.puzzle-left-rail,.puzzle-right-rail{width:100%}.puzzle-actions{display:grid;gap:6px}.puzzle-actions button{min-height:40px}.puzzle-tools-card{margin-top:auto}.toolbox{display:grid;grid-template-columns:1fr 1fr;gap:5px;margin-top:7px}.tool-btn{min-width:0;min-height:55px;padding:4px;border:1px solid var(--line);border-radius:11px;background:#f7fbfc;display:grid;grid-template-columns:25px 1fr;grid-template-rows:auto auto;align-items:center;gap:2px 5px;text-align:left}.tool-btn img{width:25px;height:25px;grid-row:1/-1}.tool-btn span{font-size:.57rem;font-weight:800}.tool-btn b{font-size:.58rem;color:#168b9b}.tool-btn.selected{background:#fff5c9;border-color:#d9b03b}.tool-empty{padding:8px;border:1px dashed var(--line);border-radius:10px;color:var(--muted);font-size:.62rem;text-align:center}.puzzle-stage{width:var(--board-size);min-width:0}.board-heading{height:0;overflow:visible;position:relative;z-index:5}.board-heading>div{position:absolute;left:8px;top:8px;padding:6px 9px;border-radius:10px;background:rgba(255,255,255,.90);box-shadow:0 5px 12px rgba(26,70,88,.09)}.board-heading .eyebrow{font-size:.48rem}.board-heading b{display:block;margin-top:1px;font-size:.76rem}.connection-tip{display:none}.puzzle-right-rail .pipe-rack{flex:1 1 auto;min-height:0;display:flex;flex-direction:column}.pipe-rack-head{display:flex;align-items:end;justify-content:space-between;gap:6px;margin-bottom:7px}.pipe-rack-head span{font-size:.62rem;color:#168b9b;font-weight:900;text-transform:uppercase;letter-spacing:.08em}.pipe-rack-head small{font-size:.55rem;color:var(--muted)}.pipe-tray{flex:1;min-height:0;display:flex;flex-direction:column;gap:6px;overflow-y:auto;scrollbar-width:none}.pipe-tray::-webkit-scrollbar{display:none}.tray-pipe{flex:1 1 0;min-height:58px;max-height:94px;padding:5px;border:1px solid var(--line);border-radius:12px;background:#f6fafb;display:grid;grid-template-columns:48px minmax(0,1fr) auto;align-items:center;gap:6px;color:#355768;text-align:left;touch-action:none;user-select:none}.tray-pipe.selected{background:#fff4c4;border-color:#d5aa2b}.tray-pipe-art{width:48px;height:48px}.tray-pipe-label{font-size:.62rem;font-weight:850}.tray-pipe b{font-size:.68rem;color:#168b9b}.tray-empty{display:grid;place-items:center;height:100%;color:var(--muted);font-size:.65rem;text-align:center}
.arcade-layout{display:grid;grid-template-columns:170px var(--board-size) 216px;gap:12px;align-items:start}.arcade-left-rail{width:170px}.arcade-stage{width:var(--board-size)}.arcade-right-rail{width:216px}.arcade-score-grid{display:grid;grid-template-columns:1fr 1fr;gap:7px}.arcade-detail{padding:10px}.arcade-pause-btn{margin-top:auto;min-height:46px}.arcade-right-rail .stat-card b{font-size:1.28rem}
.mini-layout{display:grid;grid-template-columns:170px var(--board-size) 216px;gap:12px;align-items:start}.mini-left-rail{width:170px}.mini-right-rail{width:216px}.mini-stage{width:var(--board-size)}.mini-tip{margin-top:auto}.mini-right-rail button{margin-top:auto;min-height:42px}.pressure-dots{display:flex;gap:5px;margin-top:7px}.pressure-dots i{width:16px;height:16px;border-radius:50%;background:#e95a58;box-shadow:inset 0 -2px 0 rgba(113,31,31,.16)}
.pressure-dots i.off{opacity:.16;filter:grayscale(1)}

/* v0.51 motion polish */
.game-frame{animation:gameEnter .26s ease-out both}
.game-board{animation:boardEnter .30s cubic-bezier(.2,.85,.2,1) both}
.flow-flash.show{animation:flashPop .38s cubic-bezier(.2,.9,.2,1.12) both}
.pipe-drag-ghost{animation:dragGhostFloat .72s ease-in-out infinite alternate}
.tray-pipe.selected{animation:traySelect .8s ease-in-out infinite alternate}
@keyframes gameEnter{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
@keyframes boardEnter{from{opacity:.35;transform:scale(.975)}to{opacity:1;transform:scale(1)}}
@keyframes flashPop{0%{opacity:0;transform:translate(-50%,-50%) scale(.72)}55%{opacity:1;transform:translate(-50%,-50%) scale(1.08)}100%{opacity:1;transform:translate(-50%,-50%) scale(1)}}
@keyframes dragGhostFloat{from{filter:drop-shadow(0 10px 14px rgba(10,55,77,.22));transform:translate(-50%,-50%) scale(1.02)}to{filter:drop-shadow(0 14px 22px rgba(10,55,77,.34));transform:translate(-50%,-53%) scale(1.08)}}
@keyframes traySelect{from{box-shadow:inset 0 0 0 1px rgba(224,177,44,.45)}to{box-shadow:inset 0 0 0 3px rgba(224,177,44,.72)}}
@media(prefers-reduced-motion:reduce){.game-frame,.game-board,.flow-flash.show,.pipe-drag-ghost,.tray-pipe.selected{animation:none!important}}
.game-board.route-complete{animation:boardFlowComplete .68s ease-in-out}
.game-board.route-complete .flowing .pipe-piece{animation:routePipeCelebrate .55s ease-in-out}
@keyframes boardFlowComplete{0%,100%{box-shadow:0 10px 26px rgba(29,73,82,.13)}50%{box-shadow:0 0 0 5px rgba(63,219,255,.24),0 14px 34px rgba(18,136,164,.24)}}
@keyframes routePipeCelebrate{0%,100%{transform:rotate(var(--pipe-rot,0deg)) scale(1)}50%{transform:rotate(var(--pipe-rot,0deg)) scale(1.07)}}
@media(prefers-reduced-motion:reduce){.game-board.route-complete,.game-board.route-complete .flowing .pipe-piece{animation:none!important}}