/* Tilt Levels. Luke Steuber. */
@font-face{font-family:"Plex Mono";src:url("fonts/IBMPlexMono-500.woff2") format("woff2");font-weight:500;font-display:swap}
@font-face{font-family:"Plex Sans";src:url("fonts/IBMPlexSans-400.woff2") format("woff2");font-weight:400;font-display:swap}
:root{color-scheme:dark;--bg:#000;--ink:#fff;--text:#ededed;--sub:#a6a6a6;--line:#262626;--edge:#8f8f8f;--frame:#ededed;--scrim:rgba(0,0,0,.8);--tray:#161616;--tray-deep:#0b0b0b;--ball:#dadada;--ball-light:#fff;--ball-shade:#707070;--mono:"Plex Mono",monospace;--sans:"Plex Sans",sans-serif}
:root[data-theme=light]{color-scheme:light;--bg:#fff;--ink:#000;--text:#121212;--sub:#606060;--line:#dedede;--edge:#4f4f4f;--frame:#121212;--scrim:rgba(255,255,255,.8);--tray:#f2f2f2;--tray-deep:#e2e2e2;--ball:#252525;--ball-light:#929292;--ball-shade:#000}
@media(prefers-color-scheme:light){:root[data-theme=system]{color-scheme:light;--bg:#fff;--ink:#000;--text:#121212;--sub:#606060;--line:#dedede;--edge:#4f4f4f;--frame:#121212;--scrim:rgba(255,255,255,.8);--tray:#f2f2f2;--tray-deep:#e2e2e2;--ball:#252525;--ball-light:#929292;--ball-shade:#000}}
*{box-sizing:border-box;border-radius:0}body{margin:0;height:100dvh;overflow:hidden;background:var(--bg);color:var(--text);font:16px/1.45 var(--sans);-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}button,select,input{font:inherit;color:inherit}button{cursor:pointer}button:disabled{opacity:.35;cursor:default}[hidden]{display:none!important}button:focus-visible,select:focus-visible,input:focus-visible{outline:2px solid var(--ink);outline-offset:2px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
html,body{touch-action:manipulation}
.readout{position:fixed;top:calc(max(0px,env(safe-area-inset-top)) + 18px);left:50%;transform:translateX(-50%);font:500 13px/1 var(--mono);letter-spacing:.02em;color:var(--sub);font-variant-numeric:tabular-nums;white-space:nowrap}
#restart-btn{position:fixed;top:max(0px,env(safe-area-inset-top));left:8px;color:var(--sub);z-index:2}.toolbar{position:fixed;bottom:max(6px,env(safe-area-inset-bottom));left:8px;right:8px;display:flex;justify-content:space-between}.toolbar>div{display:flex}.ib{display:inline-grid;place-items:center;width:48px;height:48px;min-width:48px;min-height:48px;border:0;background:none;padding:12px;color:var(--ink);transition:opacity .15s,transform .1s}.ib svg{width:24px;height:24px;stroke:currentColor;fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}.ib:active{transform:scale(.94)}.toolbar .ib{color:var(--sub)}.ib:hover,.ib:focus-visible{color:var(--ink)}
#board-shell{position:absolute;inset:58px 12px 104px;display:flex;align-items:center;justify-content:center;overscroll-behavior:contain}
.board-stage{position:relative;flex:none}
#feedback{position:fixed;bottom:66px;left:16px;right:16px;margin:0;text-align:center;color:var(--sub);font:14px/1.3 var(--sans);pointer-events:none}
/* The stack: every tray drawn flat, one under the next, left edges aligned,
   so a hole and its landing cell share a column and a drop reads as straight
   down the screen. Hairline chimneys in the gaps join each hole to the cell
   it lands on; depth ticks at the left edge count trays from the top. */
.stack{position:relative;touch-action:none;--cell:40px;--gap:14px}
.stack:focus-visible{outline:2px solid var(--ink);outline-offset:6px}
.tray{position:relative;border:1px solid var(--line);background:linear-gradient(180deg,var(--tray),var(--tray-deep));transform:perspective(900px) rotateX(calc(var(--pitch,0)*1deg)) rotateY(calc(var(--roll,0)*1deg));transition:transform .38s cubic-bezier(.2,.7,.2,1)}
.tray+.tray{margin-top:var(--gap)}
.tray.active{border-color:var(--edge)}
.tray .depth{position:absolute;left:-11px;top:0;bottom:0;display:flex;flex-direction:column;justify-content:center;gap:3px;pointer-events:none}
.tray .depth i{display:block;width:5px;height:1px;background:var(--sub)}
.tray.active .depth i{background:var(--edge)}
.grid-row{display:flex}
.cell{width:var(--cell);height:var(--cell);position:relative;flex:none;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.grid-row:last-of-type .cell{border-bottom:0}
.cell:last-child{border-right:0}
.cell.block{background:var(--ink);box-shadow:inset 0 0 0 1px var(--bg)}
.hole{position:absolute;inset:27%;border:1px solid var(--sub);border-radius:50%;pointer-events:none}
.hole.goal{inset:21%;border-color:var(--ink)}
.hole.goal::after{content:'';position:absolute;inset:3px;border:1px solid var(--ink);border-radius:50%}
.stack.dropped .hole.goal{background:var(--ink)}
.stack.dropped .hole.goal::after{border-color:var(--bg)}
.shafts{position:absolute;inset:0;pointer-events:none}
.shaft{position:absolute;border-left:1px solid var(--line);border-right:1px solid var(--line)}
.shaft::after{content:'';position:absolute;left:50%;bottom:2px;width:5px;height:5px;transform:translateX(-50%);border-right:1px solid var(--sub);border-bottom:1px solid var(--sub)}
.marble{position:absolute;left:0;top:0;width:calc(var(--cell)*.44);height:calc(var(--cell)*.44);margin:calc(var(--cell)*.28);border-radius:50%;background:radial-gradient(circle at 32% 28%,var(--ball-light) 4%,var(--ball) 45%,var(--ball-shade) 92%);box-shadow:0 1px 3px #0007;pointer-events:none;z-index:2;will-change:transform}
.stack.dropped .marble{display:none}
.hint-arrow{position:absolute;z-index:3;color:var(--ink);pointer-events:none;animation:pulse .9s infinite}
.hint-arrow svg{display:block;width:calc(var(--cell)*.5);height:calc(var(--cell)*.5);stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.completion{position:absolute;top:calc(100% + 8px);left:0;right:0;display:flex;justify-content:center}
#board,.tray,.cell,.marble,button,button *{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
.sheet{width:min(32rem,calc(100vw - 16px));max-height:calc(100dvh - 16px);border:1px solid var(--frame);padding:0;background:var(--bg);color:var(--text)}.sheet[open]{display:flex;flex-direction:column}.sheet::backdrop{background:var(--scrim)}.sheet-head{display:flex;justify-content:space-between;align-items:center;padding:8px 16px;gap:12px;flex:none;border-bottom:1px solid var(--line)}.sheet-head h2{margin:0;font:500 16px/1.3 var(--mono)}.sheet-head form{margin:0}.sheet-x{width:44px;height:44px;min-width:44px;min-height:44px;padding:10px}.sheet-body{padding:20px 24px;overflow:auto;min-height:0;overscroll-behavior:contain}.sheet-body p{margin:0 0 16px}.row{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:52px;border-bottom:1px solid var(--line)}.row select{max-width:65%;min-height:44px;background:var(--bg);border:0;padding:4px 8px}.row button{min-height:44px;background:none;border:0;padding:8px}.row button:not(:disabled){text-decoration:underline;text-underline-offset:4px}.sheet-body .quiet{margin:8px 0;color:var(--sub);font:13px/1.4 var(--mono)}.sheet-foot{padding:12px 24px;border-top:1px solid var(--line);flex:none;color:var(--sub);font-size:14px}.sheet-foot a{color:inherit}
@keyframes pulse{50%{opacity:.3}}
@media(max-width:480px){.sheet-head{padding:8px 12px}.sheet-body{padding:16px}}
@media(orientation:landscape) and (max-height:500px){#board-shell{inset:48px 72px 12px 12px}.toolbar{left:auto;right:8px;top:12px;bottom:12px;flex-direction:column;width:48px}.toolbar>div{flex-direction:column}.readout{left:calc(50% - 32px)}#feedback{left:12px;right:72px;bottom:4px;font-size:12px}.completion{top:calc(100% + 2px)}.completion .ib{width:44px;height:44px;min-width:44px;min-height:44px;padding:10px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}:root[data-motion=reduce] *,:root[data-motion=reduce] *::before,:root[data-motion=reduce] *::after{animation:none!important;transition:none!important}
@media(forced-colors:active){:root{--bg:Canvas;--ink:CanvasText;--text:CanvasText;--sub:CanvasText;--line:GrayText;--edge:CanvasText;--frame:CanvasText;--tray:Canvas;--tray-deep:Canvas}.stack,.tray,.cell,.hole,.marble,.shaft{forced-color-adjust:none}.cell{border-color:GrayText}.cell.block,.marble{background:CanvasText}.hole{border-color:GrayText}.hole.goal{border-color:CanvasText}.shaft{border-color:GrayText}.tray{background:Canvas}}