:root{font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#314d3b;background:#f5f4eb;font-synthesis:none;--ink:#314d3b;--muted:#667266;--paper:#fffdf5;--line:#c9d2bf;--accent:#ad691d;--pair:#e3ecd7;--warn:#9b3928;--cell:44px}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0}button,input,select{font:inherit;color:inherit;font-size:14px;min-height:44px;border:1px solid var(--line);border-radius:11px;padding:10px 12px;background:var(--paper)}button{font-weight:650;cursor:pointer;touch-action:manipulation}button:hover{background:#eaf0e0}button:disabled{opacity:.48;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--accent);outline-offset:3px}a{color:inherit}button,input,select{max-width:100%}.shell{max-width:620px;margin:auto;padding:20px 16px 28px}header{display:flex;justify-content:space-between;align-items:center;gap:12px}.brand{font-size:24px;font-weight:800;letter-spacing:-1px}.tag,.eyebrow{font-size:10px;letter-spacing:1.4px;color:var(--muted);font-weight:750}.intro{text-align:center;padding:28px 0 22px}.intro h1{font-family:Georgia,serif;font-size:44px;font-weight:500;letter-spacing:-1px;margin:8px 0}.intro p{font-size:14px;margin:0;color:var(--muted)}.play-top,.stats,.view-controls,.dialog-head{display:flex;align-items:center;justify-content:space-between;gap:10px}.play-top{font-size:13px}.play-top #level{text-align:center;line-height:1.5}.play-top button{flex-shrink:0}.stats{margin:16px 2px 10px;color:var(--muted);font-size:12px}.interaction{display:flex;align-items:center;gap:10px;background:#e9eddf;border-radius:12px;padding:8px 10px;margin:8px 0 12px}.interaction p{font-size:13px;line-height:1.5;margin:0;flex:1;min-height:39px}.interaction button{font-size:12px;max-width:100px;padding:7px}.view-controls{font-size:11px;color:var(--muted)}.view-controls button{font-size:12px}.scroll-note,.muted{font-size:12px;color:var(--muted);line-height:1.6}.scroll-note{margin:8px 1px}.board-scroll{max-width:100%;overflow:auto;max-height:min(64vh,460px);border:2px solid #b3c0a5;border-radius:12px;background:#d8e0cc;overscroll-behavior:contain;touch-action:pan-x pan-y;scroll-padding:5px;padding:6px}.board{display:grid;grid-template-columns:repeat(var(--cols),var(--cell));width:max-content;margin:auto;position:relative;background:#d2dcc6;padding:3px;gap:0}.cell{width:var(--cell);height:var(--cell);min-width:var(--cell);min-height:var(--cell);border:1px solid #b8c6a7;border-radius:0;background:#fffdf5;padding:0;font-size:21px;font-weight:650;position:relative;line-height:1;scroll-margin:6px}.cell .number{position:relative;z-index:2}.cell.covered{background:#e3ecd7;border-color:#d6dfce}.cell.covered.west{border-left:3px solid #536c49}.cell.covered.east{border-right:3px solid #536c49}.cell.covered.north{border-top:3px solid #536c49}.cell.covered.south{border-bottom:3px solid #536c49}.cell.conflict{background:#f8ded0;color:var(--warn)}.cell .warning{position:absolute;right:3px;top:2px;font-size:11px;color:var(--warn)}.cell.preview{box-shadow:inset 0 0 0 3px #ad691d;background:#ffedbf}.board.drag-mode,.board.drag-mode .cell{touch-action:none;user-select:none;-webkit-user-select:none}.cell.selected{box-shadow:inset 0 0 0 3px var(--accent);background:#ffedbf}.cell:focus-visible{outline-offset:-4px;z-index:3}.cell:disabled{opacity:1;cursor:default}.feedback{min-height:43px;font-size:13px;text-align:center;line-height:1.6;margin:11px 0}.feedback.problem{color:var(--warn)}.toolbar,.pager{display:flex;justify-content:center;gap:8px;flex-wrap:wrap}.toolbar button{flex:1;min-width:72px}.success{text-align:center;background:#e3edd8;border:1px solid #b5c7a1;border-radius:18px;padding:15px;margin-top:16px}.success h2,dialog h2{font-family:Georgia,serif;font-weight:500}.success h2{font-size:27px;margin:0 0 8px}.success p{font-size:13px;margin:0;line-height:1.5}#historical{text-align:center}details{border:1px solid var(--line);border-radius:14px;background:var(--paper);padding:12px;margin-top:18px}summary{cursor:pointer;min-height:44px;display:flex;align-items:center;gap:8px;font-size:14px;font-weight:650}summary:before{content:'▸'}details[open] summary:before{content:'▾'}summary span{font-size:12px;margin-left:auto;color:var(--muted)}.pair-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(65px,1fr));gap:7px}.type{padding:9px 4px;text-align:center;border:1px solid var(--line);border-radius:8px;font-size:13px}.type.met{background:#e3ecd7}.type.repeated{background:#f8ded0;color:var(--warn);border-color:var(--warn)}.overview{padding:8px;border:1px solid var(--line);border-radius:12px;background:#e9eddf;text-align:center}.overview p{font-size:12px;line-height:1.5}.overview svg{display:block;width:100%;max-width:440px;max-height:400px;margin:auto}.save-panel{text-align:center;margin:20px 0;font-size:12px;line-height:1.6}.save-panel button{margin:4px;font-size:12px}#save-note{min-height:2em}.save-panel.error{color:var(--warn);border:1px solid #e5b09d;border-radius:12px;padding:10px}.temporary-note{background:#fff0c8;border:2px solid #b57d27;border-radius:12px;color:#6f4915;padding:12px;font-size:13px;line-height:1.6}.primary{background:var(--ink);color:white;border-color:var(--ink)}.primary:hover{background:#233c2c}footer{text-align:center;font-size:11px;line-height:1.6;color:var(--muted);margin-top:25px}.candidate{font-size:10px}dialog{width:min(560px,calc(100vw - 24px));max-height:calc(100dvh - 32px);border:1px solid var(--line);border-radius:22px;padding:24px;background:var(--paper);color:var(--ink);overflow:auto}dialog::backdrop{background:#26342488}dialog h2{font-size:26px;margin:0 0 12px}.dialog-head h2{margin:0;font-size:25px}.dialog-head button{font-size:12px;padding:8px}.levels{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin:15px 0}.levels button{font-size:13px;min-height:52px;padding:7px 3px}.levels small{display:block;font-size:10px;margin-top:3px}.levels .current{outline:2px solid var(--accent);outline-offset:1px}.levels .done{background:#e3ecd7}.pager button{font-size:12px;padding:9px}#group{display:block;width:100%;margin:8px 0}.page-jump{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:12px}.page-jump input{width:65px}.page-jump button{font-size:12px}#page-range,#page-notice{font-size:12px;line-height:1.5}#page-notice{color:var(--warn);min-height:18px}dialog ol{padding-left:22px;line-height:1.7;font-size:14px}dialog li{margin:12px 0}dialog>p{font-size:13px;line-height:1.7}@media(max-width:360px){.shell{padding:14px 10px 24px}.tag{font-size:8px;letter-spacing:.8px}.intro{padding:23px 0 18px}.intro h1{font-size:38px}.eyebrow{font-size:9px}.play-top{gap:6px}.play-top button{padding:8px;font-size:12px}.play-top #level{font-size:11px}.view-controls{gap:6px;font-size:10px}dialog{padding:16px}.dialog-head h2{font-size:22px}.levels{gap:6px}.pager{gap:5px}.pager button{font-size:11px;padding:8px}.interaction p{font-size:12px}}@media(prefers-reduced-motion:no-preference){button{transition:background .15s}}
/* Magnets uses the same MellowTap paper/ink shell, with paired-cell controls. */
:root{--positive:#285a46;--negative:#775033;--rail:42px}
.polarity-controls{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;margin:0 0 13px}.polarity-controls button{min-width:0;padding:10px 3px;font-size:13px;border-width:2px}.polarity-controls #plus{color:var(--positive)}.polarity-controls #minus{color:var(--negative)}.polarity-controls button:disabled{opacity:.5}.view-controls{margin:0 1px}
.board{grid-template-columns:var(--rail) repeat(var(--cols),var(--cell)) var(--rail);padding:3px;background:#e8ebdf}.cell{border:0;color:var(--ink);background:#fffdf5;font-size:25px;touch-action:pan-x pan-y}.cell.horizontal-first{border:3px solid #536c49;border-right:1px dashed #afbaa4;border-radius:10px 0 0 10px}.cell.horizontal-last{border:3px solid #536c49;border-left:0;border-radius:0 10px 10px 0}.cell.vertical-first{border:3px solid #536c49;border-bottom:1px dashed #afbaa4;border-radius:10px 10px 0 0}.cell.vertical-last{border:3px solid #536c49;border-top:0;border-radius:0 0 10px 10px}.cell.fixed{border:1px solid #a8b19c;background:repeating-linear-gradient(135deg,#dce0d4,#dce0d4 4px,#e9ecdf 4px,#e9ecdf 8px);border-radius:8px;font-size:22px}.cell .fixed-note{font-size:8px;position:absolute;bottom:2px;left:0;right:0;letter-spacing:.4px}.cell.fixed .pole{position:relative;top:-3px}.cell.unknown{color:#788171}.cell.neutral:not(.fixed){background:#eceee5;color:#616c59}.cell.positive{color:var(--positive);background:#eef4e5}.cell.negative{color:var(--negative);background:#f6eddf}.cell.paired{background:#fff1cc}.cell.selected{box-shadow:inset 0 0 0 3px #ad691d;background:#ffe5a3}.cell.conflict{background:#f8ded0;color:var(--warn)}.cell:focus-visible{outline-offset:-5px;z-index:4}.cell:hover{filter:brightness(.97)}.cell:disabled{filter:none}
.clue,.corner{width:44px;height:44px;display:flex;align-items:center;justify-content:center;font-size:12px;line-height:1.2;color:#4f5c49;text-align:center}.clue strong{font-size:16px}.clue.met{background:#d9e8cd;border-radius:8px}.clue.conflict{background:#f8ded0;color:var(--warn);border:1px solid var(--warn);border-radius:8px}.clue b{font-size:10px}.clue.missing{color:#777d70}.corner{width:var(--rail);font-size:9px;letter-spacing:.5px;color:#69725f}.board>.clue:nth-child(1){width:var(--rail)}.line-readout{font-size:12px;color:#52624f;line-height:1.65;padding:10px 12px;background:#e9eddf;border-radius:11px;min-height:61px;margin:12px 0 0}.feedback{min-height:43px;margin:8px 0 12px}.intro{padding:22px 0 18px}.intro h1{font-size:44px}.toolbar button{max-width:180px}.interaction p{min-height:44px}.interaction button{min-width:66px}.board-scroll{max-height:min(58vh,420px)}.overview svg{max-height:400px}.tag{max-width:155px;text-align:right}.shell{padding-bottom:max(28px,env(safe-area-inset-bottom))}@media(max-width:360px){.polarity-controls button{font-size:12px}.intro{padding:20px 0 17px}.intro h1{font-size:38px}.view-controls{font-size:10px;gap:8px}.line-readout{font-size:11px}.board-scroll{padding:4px}.interaction p{font-size:12px}.tag{max-width:135px}}@media(max-height:440px){.intro{padding:12px 0}.intro h1{font-size:32px;margin:3px 0}.board-scroll{max-height:210px}.shell{padding-top:12px}}

.clue{width:100%;min-width:0}
/* Keep only the four selected-domino actions reachable during page scrolling. */
.polarity-controls{position:sticky;top:max(0px,env(safe-area-inset-top));z-index:8;background:var(--paper);padding:6px;border-radius:13px;box-shadow:0 2px 6px #314d3b1a}
@media(max-width:440px){.intro{padding:12px 0 14px}.intro h1{font-size:36px;margin:5px 0}.intro .eyebrow{font-size:9px}}

.polarity-controls button{white-space:nowrap;padding-inline:2px}

/* Site footer: wrapping links keep 44 CSS px activation targets. */
.site-links{display:flex;flex-wrap:wrap;justify-content:center;gap:4px 12px}.site-links a{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:6px 3px}