@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;450;500;550;600;650;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');
:root{--ink:#203c35;--muted:#727d71;--forest:#173e36;--paper:#f4f3e9;--line:#dddfd2;--white:#fdfdf7;--lime:#d6e7a4;--orange:#dfac70;--font:'DM Sans',system-ui,sans-serif;--display:'Space Grotesk',var(--font)}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:14px/1.5 var(--font)}button,input{font:inherit}button,a,input{ -webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}button:disabled{cursor:not-allowed;opacity:.42}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid var(--focus);outline-offset:3px}button{border:0}a{color:inherit}button:hover:not(:disabled){filter:brightness(.96)}button:active:not(:disabled){transform:translateY(1px)}.topbar{height:79px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:0 3.5vw;gap:20px}.brand{font:600 27px var(--display);text-decoration:none;display:flex;align-items:center;gap:10px;letter-spacing:-1.2px}.brand-mark{font:40px/1 var(--display);color:var(--forest);margin-top:-4px}.prototype{font:600 9px var(--font);letter-spacing:1.1px;padding:5px 7px;border:1px solid var(--line);border-radius:4px;margin-left:10px}.top-actions{display:flex;align-items:center;gap:24px}.saved{font-size:11px;color:var(--muted)}.saved:before{content:'';display:inline-block;width:5px;height:5px;background:var(--success);border-radius:100%;margin-right:6px}.button{background:var(--forest);color:var(--on-accent);padding:13px 20px;border-radius:7px;font-weight:600;display:flex;align-items:center;justify-content:space-between;gap:22px}.button.small{font-size:12px;padding:10px 15px}.text-button{background:transparent;padding:0;font-size:11px;text-decoration:none;text-underline-offset:4px}.text-button:hover{text-decoration:underline}.primary{width:100%;background:var(--forest)}.quiet{color:var(--muted);font-size:11px}main{max-width:1700px;margin:auto;padding:36px 3.5vw 0}.intro{display:flex;justify-content:space-between;align-items:center;gap:30px;margin-bottom:30px}.eyebrow{font-size:9px;font-weight:700;letter-spacing:1.8px;color:var(--muted)}h1{font:500 clamp(24px,2.6vw,39px)/1.2 var(--display);letter-spacing:-1.6px;margin:9px 0 9px}.intro p{margin:0;color:var(--muted);font-size:13px}.puzzle-label{border-left:1px solid var(--line);padding-left:23px;display:flex;flex-direction:column;gap:4px;min-width:220px}.puzzle-label strong{font:500 17px var(--display);letter-spacing:-.4px}.puzzle-label>span:last-child{font-size:11px;color:var(--muted)}.game-layout{display:grid;grid-template-columns:minmax(0,1fr) 362px;gap:22px;align-items:start}.panel{background:var(--white);border:1px solid var(--line);border-radius:11px;overflow:hidden}.panel-heading{display:flex;align-items:center;justify-content:space-between;padding:18px 20px;gap:10px}.panel-heading>div{display:flex;align-items:center;gap:10px}h2{font:500 15px var(--display);margin:0;letter-spacing:-.2px}.section-number{font:500 10px var(--display);color:var(--muted);border:1px solid var(--line);width:23px;height:23px;display:grid;place-items:center;border-radius:50%}.bench-tools{display:flex;justify-content:space-between;gap:8px;padding:0 16px 12px;flex-wrap:wrap}.tool-group{display:flex;align-items:center;gap:4px}.tool,.icon-button{background:transparent;border:1px solid transparent;border-radius:5px;padding:6px 8px;font-size:11px}.tool[aria-pressed=true]{background:var(--soft);border-color:var(--line);color:var(--ink)}.icon-button{font-size:18px;line-height:1;padding:5px 8px}.tool:hover,.icon-button:hover{background:var(--soft)}.divider{height:18px;border-left:1px solid var(--line);margin:0 4px}.viewport{position:relative;overflow:auto;background:var(--bench);border-block:1px solid var(--line);height:clamp(450px,56vw,660px);touch-action:pan-x pan-y}.stage{width:1040px;height:728px;position:relative;transform-origin:top left;background-image:radial-gradient(var(--dot) 1px,transparent 1px);background-size:26px 26px;user-select:none;touch-action:none}.stage.select-mode{cursor:crosshair}.bench-caption{position:absolute;left:109px;top:46px;letter-spacing:2px;font-size:10px;font-weight:600;color:var(--muted);pointer-events:none}.bench-caption span{display:block;font:400 12px var(--font);letter-spacing:0;color:var(--muted);margin-top:6px}.board{position:absolute;left:416px;top:208px;width:312px;height:312px;background:var(--slot);outline:2px dashed var(--slot-line);outline-offset:7px;border-radius:3px;pointer-events:none}.board-caption{position:absolute;top:-39px;left:0;letter-spacing:2px;font-size:11px;font-weight:600;color:var(--muted)}.board-cells{height:100%;background:linear-gradient(to right,transparent calc(100% - 1px),var(--slot-line) 0),linear-gradient(to bottom,transparent calc(100% - 1px),var(--slot-line) 0);background-size:104px 104px}.board.complete{outline-style:solid;outline-color:var(--slot-complete)}.bench-footer{position:absolute;bottom:59px;right:90px;font:400 17px/1.5 var(--display);letter-spacing:-.3px;color:var(--muted);pointer-events:none}.bench-footer em{font:400 13px var(--font);color:var(--muted)}.tile{position:absolute;width:96px;height:96px;margin:4px;background:var(--tile);border:1px solid var(--tile-line);border-radius:9px;box-shadow:0 3px 0 var(--tile-edge),0 5px 8px var(--shadow);display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);padding:5px;gap:1px;touch-action:none;transition:box-shadow .12s,border-color .12s;cursor:grab}.tile.selected{border:2px solid var(--select-line);padding:4px;box-shadow:0 0 0 3px var(--select-halo),0 3px 0 var(--tile-edge);background:var(--selected)}.tile.dragging{z-index:10;cursor:grabbing;box-shadow:0 8px 18px var(--drag-shadow)}.tile.no-notes .note{visibility:hidden}.tile-number{grid-row:2;grid-column:2;font:500 30px/1 var(--display);letter-spacing:-1.5px;background:transparent;padding:0;cursor:grab;align-self:center}.note{font:600 11px/1 var(--font);padding:1px;display:flex;align-items:center;justify-content:center;gap:1px;background:transparent;border-radius:5px;min-width:0;color:var(--note-ink);position:relative}.note .mark{font-size:9px;opacity:.7}.note:hover{background:var(--soft)}.note[data-state="1"],.note-demo.green{background:#dcefd4;color:#315d35}.note[data-state="2"],.note-demo.yellow{background:#fff0b8;color:#775b10}.note[data-state="3"],.note-demo.red{background:#f8dacf;color:#9d4534}.note.no-load[data-state="0"]{color:var(--note-empty)}.bench-bottom{display:flex;justify-content:space-between;gap:20px;padding:13px 20px;font-size:10px;color:var(--muted)}#selectionBox{position:absolute;border:1px solid var(--select-line);background:var(--select-halo);pointer-events:none;z-index:20}.sidebar{display:flex;flex-direction:column;gap:18px}.ledger .panel-heading{padding-bottom:8px}.panel-description{font-size:11px;color:var(--muted);margin:0 20px 14px}.table-scroll{padding:0 15px;overflow:auto}table{border-collapse:separate;border-spacing:0;width:100%;font-size:10px;text-align:center;table-layout:fixed;font-variant-numeric:tabular-nums}th,td{height:29px;padding:0;border-bottom:1px solid var(--line);border-right:1px solid var(--line);font-weight:450}th{background:var(--table-head);font-weight:650;color:var(--ink)}th:first-child{border-left:1px solid var(--line)}thead th{border-top:1px solid var(--line)}th button{display:block;width:100%;height:100%;background:transparent;padding:0;font-weight:650;font-size:10px}th button[aria-pressed=true]{background:var(--mark-head)}.col-reviewed{background:var(--col-mark)}tr.row-reviewed td{background:var(--row-mark)}tr.row-reviewed td.col-reviewed{background:repeating-linear-gradient(135deg,var(--col-mark),var(--col-mark) 5px,var(--row-mark) 5px,var(--row-mark) 10px)}td.diagonal{color:var(--note-empty);background:var(--diagonal)}.table-key{display:flex;gap:15px;font-size:9px;color:var(--muted);margin:12px 20px}.table-key>span{display:flex;align-items:center;gap:5px}.table-key i{display:inline-block;width:8px;height:8px;border-radius:2px}.row-swatch{background:var(--row-swatch)}.col-swatch{background:var(--col-swatch)}.table-note{font-size:10px;color:var(--muted);line-height:1.7;margin:12px 20px 18px}#rulesPanel{border-top:1px solid var(--line);padding:13px 20px}h3{font:500 12px var(--display);margin:0 0 8px}#rulesList{list-style:none;padding:0;margin:0;font-size:11px}#rulesList li{padding:4px 0}#rulesList b{font-weight:650}#rulesList span{display:inline-block;min-width:43px;font-variant-numeric:tabular-nums;color:var(--muted)}.check-panel .panel-heading{padding-bottom:10px}.status-dot{width:7px;height:7px;border-radius:50%;background:var(--dot)}.status-dot.success{background:var(--success)}.check-summary{display:flex;justify-content:space-between;align-items:center;padding:0 20px}.check-summary>div:first-child{display:flex;flex-direction:column}.check-summary .eyebrow{font-size:8px;letter-spacing:1px}.check-summary>div>strong{font:500 48px/1.2 var(--display);letter-spacing:-2px}.target{display:flex;flex-direction:column;align-items:flex-end;color:var(--muted);font-size:10px}.target strong{font:500 22px/1.4 var(--display)!important;letter-spacing:-.5px!important;color:var(--ink)}.target small{font-size:9px}#checkMessage{margin:10px 20px 15px;font-size:11px;color:var(--muted);min-height:34px}.check-panel>.button{width:calc(100% - 40px);margin:0 20px;padding:12px 15px;font-size:12px}.check-footer{margin:14px 20px 17px;font-size:9px;color:var(--muted);display:flex;justify-content:space-between;align-items:center}.check-footer button{font-size:9px}#checkDetails{margin:15px 20px 0;padding:10px 12px;background:var(--soft);border-radius:5px;font-size:10px;max-height:205px;overflow:auto}#checkDetails summary{cursor:pointer;font-weight:600}#checkDetails ul{padding:0;margin:8px 0 0;list-style:none}#checkDetails li{display:flex;justify-content:space-between;margin:4px 0}#checkDetails .violation{color:var(--danger)}.notes-strip{display:flex;align-items:center;gap:14px;padding:21px 3px}.note-icon{font-size:28px;color:#728161}.notes-strip strong{font-size:12px;font-weight:550}.notes-strip p{margin:3px 0 0;font-size:11px;color:var(--muted)}.notes-strip>.tool{margin-left:auto;white-space:nowrap;border:1px solid var(--line)}.note-demo{display:inline-grid;place-items:center;width:17px;height:17px;border-radius:4px;font-weight:650}.page-footer{border-top:1px solid var(--line);padding:19px 0 25px;display:flex;justify-content:space-between;font-size:9px;letter-spacing:.8px;gap:20px;align-items:center}.page-footer>div{display:flex;align-items:center;gap:20px}.page-footer .quiet{font-size:9px;letter-spacing:0}.page-footer a{font-size:10px;letter-spacing:0;text-decoration:none}.page-footer a:hover{text-decoration:underline}.page-footer button{font-size:10px}dialog{border:1px solid var(--line);background:var(--white);color:var(--ink);border-radius:14px;width:min(540px,calc(100vw - 30px));padding:28px;box-shadow:0 20px 80px var(--drag-shadow);max-height:90vh;overflow:auto}dialog::backdrop{background:var(--backdrop);backdrop-filter:blur(3px)}.dialog-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}dialog h2{font-size:26px;letter-spacing:-1px;margin:10px 0}dialog p{font-size:12px;color:var(--muted)}.mode-options{padding:0;border:0;margin:20px 0;display:grid;gap:8px}.mode-options label{display:flex;align-items:center;gap:12px;padding:14px;border:1px solid var(--line);border-radius:7px;cursor:pointer}.mode-options label:has(input:checked){border-color:var(--select-line);background:var(--soft)}.mode-options strong{display:block;font-size:13px}.mode-options small{display:block;font-size:11px;color:var(--muted);margin-top:3px}input[type=radio],input[type=checkbox]{accent-color:var(--forest)}.seed-field{display:flex;flex-direction:column;font-size:12px;gap:6px}.seed-field input{border:1px solid var(--line);border-radius:5px;background:var(--tile);padding:10px;color:var(--ink)}.seed-field small{font-size:10px;color:var(--muted)}.checkbox-label{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:12px;margin:18px 0 23px}.checkbox-label small{font-size:10px;color:var(--muted)}.help-list{padding-left:21px;font-size:12px;line-height:1.7}.help-list li{margin:13px 0}.help-tip{padding:12px;background:var(--soft);border-radius:6px;line-height:1.7}.solution-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:7px;margin:22px auto;width:230px}.solution-grid div{background:var(--soft);border:1px solid var(--line);border-radius:6px;font:500 26px var(--display);padding:13px;text-align:center}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--forest);color:var(--on-accent);border-radius:7px;font-size:12px;padding:12px 20px;box-shadow:0 5px 20px var(--shadow);opacity:0;transition:.2s;z-index:100;pointer-events:none;max-width:90vw}#toast.show{opacity:1;transform:translateX(-50%)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[hidden]{display:none!important}.design-page{max-width:980px;padding-bottom:60px}.design-page h1{font-size:44px}.design-page h2{font-size:23px;margin:35px 0 12px}.design-page p,.design-page li{font-size:14px;line-height:1.85;max-width:750px}.design-page .revision{background:var(--soft);border-left:3px solid var(--slot-line);padding:15px 20px;margin:15px 0}.design-page table{table-layout:auto;font-size:12px;text-align:left;margin:20px 0}.design-page td,.design-page th{padding:10px;height:auto;vertical-align:top}.design-page .lead{font-size:18px;color:var(--muted)}.design-page code{font-size:12px;background:var(--soft);padding:2px 5px;border-radius:3px}
@media(min-width:1500px){.game-layout{grid-template-columns:minmax(0,1fr) 400px}.viewport{height:680px}.panel-heading{padding:22px}.sidebar{gap:22px}td,th{height:32px}}
@media(max-width:1150px){.game-layout{grid-template-columns:minmax(0,1fr) 330px;gap:15px}main{padding-inline:22px}.topbar{padding-inline:22px}.top-actions{gap:15px}.prototype{display:none}.puzzle-label{min-width:190px}.intro{gap:15px}.intro h1{font-size:30px}.bench-tools{padding-inline:10px}.tool{padding-inline:6px}.viewport{height:480px}.bench-bottom{flex-direction:column;gap:6px;align-items:flex-start}.table-scroll{padding-inline:12px}.panel-heading{padding-inline:17px}}
@media(max-width:900px){.game-layout{grid-template-columns:minmax(0,1fr)}.sidebar{display:grid;grid-template-columns:1fr 1fr;align-items:start}.viewport{height:530px}.intro{margin-bottom:24px}.intro h1{font-size:30px}.intro .puzzle-label{display:none}.saved{display:none}.notes-strip{align-items:flex-start}.page-footer{align-items:flex-start}.page-footer>span .quiet{display:block;margin-top:4px}.page-footer>div{flex-wrap:wrap;justify-content:flex-end;gap:8px 15px}.check-summary>div>strong{font-size:44px}}
@media(max-width:570px){.topbar{padding:0 15px;height:65px}.brand{font-size:23px}.brand-mark{font-size:33px}.top-actions{gap:12px}.top-actions>.text-button{font-size:10px}.button.small{padding:9px 11px;font-size:10px;gap:8px}main{padding:25px 14px 0}.eyebrow{font-size:8px;letter-spacing:1.2px}.intro h1{font-size:29px;max-width:320px}.intro p{font-size:12px}.panel-heading{padding:15px}.bench-tools{gap:4px}.tool{font-size:10px;padding:6px}.tool-group{gap:1px}#clearSelect{display:none}.viewport{height:410px}.sidebar{grid-template-columns:1fr}.ledger td,.ledger th{height:33px;font-size:11px}.ledger th button{font-size:11px}.notes-strip{gap:10px;flex-wrap:wrap}.notes-strip>.tool{margin-left:36px}.notes-strip p{line-height:1.8}.notes-strip>div:nth-child(2){flex:1}.page-footer{gap:12px;flex-direction:column}.page-footer>div{justify-content:flex-start}.bench-bottom{padding-inline:15px}.panel-description{margin-inline:15px}.design-page h1{font-size:34px}.check-panel .check-summary{padding-top:8px}.check-panel #checkMessage{min-height:0}}
.board[class*=geometry-]{background:none;outline:none;border-radius:0}.board-map{position:absolute;inset:0;width:100%;height:100%;overflow:visible}.board-map polygon{fill:var(--slot);stroke:var(--slot-line);stroke-width:2;stroke-dasharray:5 3;stroke-linejoin:round}.board.complete .board-map polygon{stroke:var(--slot-complete);stroke-dasharray:none}.board.geometry-hex .board-map polygon:nth-child(even),.board.geometry-triangle .board-map polygon:nth-child(even){fill:var(--slot-alt)}.shape-caption{position:absolute;left:109px;bottom:42px;font-size:11px;color:var(--muted);max-width:460px;pointer-events:none}.nonclassic .bench-footer{display:none}.setup-selects{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:18px 0 12px}.setup-selects label{display:flex;flex-direction:column;gap:6px;font-size:11px;font-weight:600}.setup-selects select{font:400 12px var(--font);padding:9px;border:1px solid var(--line);background:var(--tile);color:var(--ink);border-radius:5px;width:100%}.setup-selects select:disabled{opacity:.5}.board-preview{display:flex;align-items:center;gap:20px;padding:14px;background:var(--soft);border-radius:7px;margin-bottom:18px;min-height:100px}.board-preview svg{width:90px;height:85px;flex-shrink:0;overflow:visible}.board-preview polygon,.solution-map polygon{fill:var(--slot);stroke:var(--slot-line);stroke-width:2}.board-preview>div{display:flex;flex-direction:column;gap:4px}.board-preview strong{font-size:12px;font-weight:550}.board-preview span{font-size:11px;line-height:1.5;color:var(--muted)}.board-preview small{font-size:10px;color:var(--muted)}.solution-map{width:min(100%,340px);margin:18px auto;max-height:340px}.solution-map svg{width:100%;height:100%;overflow:visible}.solution-map text{fill:var(--ink);font:500 34px var(--display)}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}