:root{color-scheme:light;--bg:#f5f5f7;--surface:#ffffff;--ink:#20242d;--muted:#626975;--faint:#e8edf9;--line:#d9deea;--strong:#7c879f;--accent:#315cda;--selected:#cbdafe;--related:#f0f3fa;--same:#e2ebff;--error:#a73731;--error-bg:#f9e5df;--shadow:#20242d12;font-family:ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-synthesis:none;-webkit-text-size-adjust:100%;background:var(--bg);color:var(--ink)}
:root[data-theme=dark]{color-scheme:dark;--bg:#191b22;--surface:#22252f;--ink:#eef0f7;--muted:#b4bbc9;--faint:#303747;--line:#475169;--strong:#98a6c2;--accent:#aac2ff;--selected:#354d7d;--related:#272f40;--same:#303f60;--error:#ffc1b2;--error-bg:#623b35;--shadow:#0003}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]):not([data-theme=dark]){color-scheme:dark;--bg:#191b22;--surface:#22252f;--ink:#eef0f7;--muted:#b4bbc9;--faint:#303747;--line:#475169;--strong:#98a6c2;--accent:#aac2ff;--selected:#354d7d;--related:#272f40;--same:#303f60;--error:#ffc1b2;--error-bg:#623b35;--shadow:#0003}}
*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;touch-action:manipulation}button,a{color:inherit}button{border:0;background:none}button:disabled{opacity:.32;cursor:default}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid var(--accent);outline-offset:3px}button svg,a svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.65;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}.icon-defs{position:absolute;width:0;height:0;overflow:hidden}.app-shell{width:min(100%,508px);margin:auto;padding:env(safe-area-inset-top) 22px calc(18px + env(safe-area-inset-bottom))}.icon-button{width:42px;height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:12px}.icon-button:hover{background:var(--faint)}h1 span{color:#8095c9}.title-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px}.eyebrow{font-size:9px;letter-spacing:2px;font-weight:650;color:var(--muted);margin:0 0 10px}h1{font-family:inherit;font-weight:700;font-size:36px;letter-spacing:-1.2px;line-height:1;margin:0}h2{font-family:inherit;font-size:32px;line-height:1.2;font-weight:400;letter-spacing:-.8px;margin:10px 0 18px}.new-button{font-size:12px;padding:10px 13px;border:1px solid var(--line);border-radius:24px;min-height:42px;display:flex;gap:12px;align-items:center}.new-button:hover{background:var(--faint)}.new-button span{font-size:20px}.game-meta{display:flex;align-items:center;gap:10px;min-height:40px;padding-bottom:8px}.level-tag{font-size:10px;letter-spacing:.5px;font-weight:650;background:var(--same);padding:5px 9px;border-radius:5px;white-space:nowrap}.game-status{font-size:11px;color:var(--muted)}.timer{margin-left:auto;display:flex;align-items:center;gap:7px;font-size:12px;font-variant-numeric:tabular-nums;min-height:32px;padding:0 3px}.timer svg{width:14px;height:14px;stroke-width:2}.board-wrap{position:relative}.board{display:grid;grid-template-rows:repeat(9,1fr);width:100%;aspect-ratio:1;border:2px solid var(--strong);border-radius:5px;overflow:hidden;background:var(--surface);box-shadow:0 4px 18px var(--shadow);user-select:none;-webkit-user-select:none;touch-action:manipulation}.board-row{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));min-height:0}.cell{position:relative;display:flex;align-items:center;justify-content:center;font-size:clamp(20px,6vw,30px);font-weight:430;line-height:1;padding:0;min-width:0;border:0;border-right:1px solid var(--line);border-bottom:1px solid var(--line);color:var(--accent);font-variant-numeric:tabular-nums;border-radius:0}.cell:nth-child(3n):not(:last-child){border-right:2px solid var(--strong)}.cell:last-child{border-right:0}.board-row:nth-child(3n):not(:last-child) .cell{border-bottom:2px solid var(--strong)}.board-row:last-child .cell{border-bottom:0}.cell.given{color:var(--ink);font-weight:560}.cell.peer{background:var(--related)}.cell.same{background:var(--same)}.cell.selected{background:var(--selected);box-shadow:inset 0 0 0 2px var(--accent);z-index:1}.cell.error{color:var(--error);background:var(--error-bg)}.cell.error::after{content:"";position:absolute;bottom:3px;left:calc(50% - 5px);width:10px;height:2px;background:var(--error);border-radius:2px}.cell.hinted{box-shadow:inset 0 0 0 2px #ae863d}.cell:focus-visible{outline:0;box-shadow:inset 0 0 0 3px var(--accent);z-index:2}.cell .notes{display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);width:100%;height:100%;padding:2px;color:var(--muted);font-size:clamp(8px,2.4vw,11px);font-weight:500;line-height:1}.notes span{display:flex;align-items:center;justify-content:center}.notes .matching{color:var(--accent);font-weight:800;background:var(--selected);border-radius:2px}.board-caption{display:flex;justify-content:space-between;gap:8px;font-size:10px;color:var(--muted);margin:12px 1px 14px;min-height:12px}.board-caption #progress{font-variant-numeric:tabular-nums;white-space:nowrap}.tools{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:4px;margin-bottom:17px}.tool{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;border-radius:12px;min-height:61px;padding:7px 1px;font-size:10px}.tool[aria-pressed=true]{background:var(--same);color:var(--accent)}.tool:hover:not(:disabled){background:var(--faint)}.tool-icon{position:relative;height:22px}.note-indicator{position:absolute;top:-5px;right:-17px;font-size:7px;padding:2px 3px;border-radius:4px;background:var(--faint);font-weight:750;border:2px solid var(--bg)}.tool[aria-pressed=true] .note-indicator{background:var(--accent);color:var(--bg);border-color:var(--same)}.numpad{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));gap:6px}.number{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;min-height:66px;border-radius:10px;background:var(--faint);font-size:29px;color:var(--accent);padding:5px 0;line-height:1.1}.number small{font-size:9px;color:var(--muted);font-weight:500}.number.active{box-shadow:inset 0 0 0 2px var(--accent);background:var(--same)}.number.finished{opacity:.4}.number:active{transform:translateY(1px)}.save-status{text-align:center;font-size:10px;color:var(--muted);margin:18px 0 0;line-height:1.5}.game-footer{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--line);margin-top:16px;padding-top:8px}.text-button{font-size:12px;min-height:44px;color:var(--accent);padding:9px 0;font-weight:550}.text-button span{margin-left:8px}.muted{color:var(--muted);font-weight:400}.notice{font-size:12px;color:var(--accent);line-height:1.5;margin:8px 0 0}.notice:empty{display:none}.hint-card{background:var(--same);padding:15px 17px;border-radius:12px;margin-top:16px;font-size:13px;line-height:1.6}.hint-heading{display:flex;justify-content:space-between;align-items:center}.hint-card p{margin:5px 0}.small-close{font-size:24px;min-width:34px;min-height:34px}.hint-card .text-button{padding:0;min-height:36px}.pause-overlay{position:absolute;inset:0;border:2px solid var(--strong);border-radius:5px;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--surface);z-index:3;padding:20px;text-align:center}.pause-overlay p{font-size:13px;color:var(--muted);margin:0 0 24px}.pause-overlay h2{font-size:28px}.pause-symbol{font-size:40px;color:var(--accent);font-weight:800;letter-spacing:-6px;margin-bottom:10px}.pause-overlay[hidden],.hint-card[hidden]{display:none}.primary,.secondary{border-radius:12px;min-height:48px;padding:14px 22px;font-size:14px;font-weight:600}.primary{background:var(--ink);color:var(--bg)}.secondary{background:var(--faint);color:var(--ink)}.full{width:100%}dialog{color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:24px;padding:34px 27px 26px;width:min(440px,calc(100% - 28px));max-height:calc(100dvh - 40px);overflow-y:auto;box-shadow:0 25px 90px #0002}dialog::backdrop{background:#20242d70;backdrop-filter:blur(5px)}dialog p{font-size:14px;line-height:1.7;color:var(--muted)}dialog .eyebrow{font-size:9px;margin-top:9px}dialog h2{padding-right:20px}.dialog-close{position:absolute;right:12px;top:12px}.dialog-copy{margin-bottom:20px}.difficulty-options{border:0;padding:0;margin:0 0 20px;display:flex;flex-direction:column;gap:8px}.difficulty-options label{display:flex;align-items:center;gap:12px;border:1px solid var(--line);border-radius:12px;padding:15px 12px;cursor:pointer}.difficulty-options label:has(input:checked){background:var(--related);border-color:var(--accent)}input[type=radio],input[type=checkbox]{accent-color:var(--accent);flex-shrink:0;width:18px;height:18px;margin:0}.difficulty-options strong{font-size:14px}.difficulty-options small{display:block;font-size:11px;color:var(--muted);margin-top:4px;line-height:1.5}.level-dots{font-size:9px;margin-left:auto;white-space:nowrap;color:var(--accent)}.setting-row{display:flex;align-items:center;justify-content:space-between;gap:18px;border-bottom:1px solid var(--line);padding:18px 0;font-size:13px}.setting-row small{display:block;color:var(--muted);font-size:11px;line-height:1.6;margin-top:4px}.setting-row input{width:24px;height:24px;min-width:24px}.setting-row select{max-width:145px;padding:10px 7px;border:1px solid var(--line);border-radius:7px;background:var(--bg);font-size:12px;color:var(--ink)}#auto-notes{margin-top:24px}.fine-print{font-size:11px!important;line-height:1.7}.stats-total{font-family:inherit;font-size:60px;color:var(--accent);margin-bottom:2px}.stats-sub{font-size:12px;color:var(--muted);margin-bottom:26px}.stat-row{display:flex;justify-content:space-between;padding:14px 0;border-top:1px solid var(--line);font-size:13px}.win-symbol{color:var(--accent);font-size:66px;margin-bottom:15px;line-height:1}#win-dialog{text-align:center;padding-top:36px}#win-dialog h2{padding:0;font-size:39px}.win-facts{display:flex;justify-content:center;gap:32px;margin:24px 0;font-size:22px;color:var(--accent)}.win-facts small{display:block;color:var(--muted);font-size:10px;margin-top:5px}.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}
@media(max-width:380px){.app-shell{padding-inline:14px}.title-row{margin-bottom:17px}h1{font-size:34px}.numpad{gap:4px}.number{font-size:25px;min-height:58px}.tool{min-height:55px}.tools{margin-bottom:13px}.game-status{font-size:10px}}
@media(max-height:760px) and (max-width:600px){.title-row{margin-bottom:14px}.tools{margin-bottom:12px}.tool{min-height:52px}.number{min-height:56px}.save-status{margin-top:12px}.game-footer{margin-top:12px}.board-caption{margin-block:10px}}
@media(min-width:800px){.app-shell{padding-top:20px}.title-row{margin-bottom:25px}}
@media(prefers-reduced-motion:no-preference){dialog[open]{animation:appear .16s ease-out}@keyframes appear{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}}
.pause-overlay .pause-symbol{display:block;width:27px;height:36px;border-left:9px solid var(--accent);border-right:9px solid var(--accent);font-size:0;letter-spacing:0}