: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}}
/* Range pilot: readable 44px cells at 320px, page scroll in short landscape. */
:root{--shade:#314d3b;--open:#fffdf5;--cell:44px}.intro{padding:18px 0 16px}.intro h1{font-size:40px;margin:5px 0}.quick-rule{font-size:13px;line-height:1.5;margin:12px 0;color:var(--muted)}.stats{margin:12px 2px 8px}.mode-bar{display:flex;gap:6px}.mode-bar button{flex:1;min-width:0;padding:8px;font-size:14px}.mode-bar button[aria-pressed=true]{background:var(--ink);border-color:var(--ink);color:white;box-shadow:0 0 0 2px var(--paper),0 0 0 3px var(--ink)}.selection-note{font-size:12px;line-height:1.4;margin:10px 0;min-height:34px;color:var(--muted)}.board-scroll{max-height:none;padding:6px;overflow:auto;overscroll-behavior:auto;touch-action:pan-x pan-y}.board{padding:0}.cell{background:var(--open);font-size:23px}.cell.clue{font-family:Georgia,serif;font-weight:700;background:#edf0df}.cell.met .number{text-decoration:underline;text-underline-offset:5px;text-decoration-thickness:2px}.cell.shaded{background:var(--shade);color:white;border-color:#627762}.cell.shaded:hover{background:#233c2c}.cell.white-mark{background:#fffdf5}.white-dot{font-size:40px;line-height:0;position:absolute;inset:50% 0 auto}.cell.conflict{box-shadow:inset 0 0 0 3px #f3b382}.cell.conflict .warning{color:#ffe3bc;font-weight:900}.feedback{min-height:42px;margin:10px 0}.example{display:flex;justify-content:center;margin:12px auto;gap:0}.example>*{display:grid;place-items:center;width:44px;height:44px;border:1px solid var(--line);font-size:24px}.example>span:first-child,.example>span:last-child{background:var(--shade);color:var(--shade)}.pager,.page-jump,#page-notice{display:none}.save-panel{margin:16px 0}.cell[aria-disabled=true]{cursor:help}@media(max-width:360px){.intro{padding:12px 0}.intro h1{font-size:36px}.tag{font-size:8px;letter-spacing:.5px}.board-scroll{padding:5px}.quick-rule{font-size:12px}.selection-note{font-size:11px;min-height:30px}}@media (max-height:450px) and (min-width:500px){.shell{max-width:760px;padding-top:10px}.intro{padding:8px 0}.intro h1{font-size:30px}.intro p,.eyebrow{display:none}.quick-rule{margin:8px 0}.board-scroll{width:max-content;max-width:100%;margin:auto}.selection-note{min-height:0}.stats{justify-content:center;gap:30px}.mode-bar,.toolbar{max-width:360px;margin-left:auto;margin-right:auto}.feedback{text-align:center}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

@media(forced-colors:active){.cell.shaded::after{content:"■";font-size:28px}.cell.shaded{background:Canvas;color:CanvasText;border-color:CanvasText}.cell.conflict{outline:3px dashed Highlight;outline-offset:-4px}.cell.conflict .warning{color:CanvasText}.mode-bar button[aria-pressed=true]{border:3px solid Highlight}.cell.met .number{text-decoration:underline}.cell.white-mark .white-dot{color:CanvasText}}
@media(max-width:430px){.shell{padding-top:12px}.intro{padding:8px 0}.intro .eyebrow,.intro p{display:none}.intro h1{font-size:32px;margin:2px 0}.quick-rule{font-size:12px;line-height:1.4;margin:8px 0}.stats{margin:8px 2px}.selection-note{min-height:0;margin:8px 0;font-size:11px}}

@media(max-width:430px),(max-height:450px){.mode-bar{position:sticky;top:0;z-index:5;background:var(--paper);padding:4px 2px}.cell{scroll-margin-top:62px}.mode-bar button{min-height:44px}}

.help-head{position:sticky;top:-24px;background:var(--paper);z-index:6;padding:8px 0}.help-head h2{font-size:25px}.help-head button{min-width:60px;min-height:44px}@media(max-width:360px){.help-head{top:-16px}.help-head h2{font-size:22px}}
@media (max-height:450px) and (min-width:620px){.intro{padding:4px 0}.intro h1{font-size:28px}#play{display:grid;grid-template-columns:minmax(0,1fr) 280px;column-gap:14px;align-items:start}#play>*{grid-column:1}#play>.board-scroll{grid-column:2;grid-row:1 / span 7;max-width:280px;margin:0;justify-self:end}#play .play-top{gap:5px;font-size:11px}#play .play-top button{padding:7px;font-size:12px}#play .quick-rule{font-size:12px}#play .mode-bar{position:static;width:100%;padding:3px 2px}#play .selection-note{font-size:11px}#play .feedback{font-size:12px;margin:4px 0}#play .success,#play #historical{grid-column:1 / -1}.cell{scroll-margin-top:6px}}
/* Scaled local candidate picker: bounded cards, visible paging, and persistent exit. */
.pager{display:flex}.page-jump{display:flex}#page-notice{display:block}
#progress-filter{display:block;width:100%;margin:8px 0}#next-unfinished{display:block;width:100%;margin-top:10px}
#picker-dialog .dialog-head{position:sticky;top:-24px;z-index:6;background:var(--paper);padding:8px 0}
#picker-dialog .dialog-head button{min-width:84px;min-height:44px}
@media(max-width:360px){#picker-dialog .dialog-head{top:-16px}}