:root{color-scheme:light;--bg:#f2f3fa;--surface:#ffffff;--surface-soft:#f7f7fc;--ink:#242438;--muted:#717187;--line:#e2e3ef;--grid:#b5b7d0;--accent:#6554dc;--accent-hover:#5242c4;--accent-soft:#eeebff;--axis:#edeffc;--box:#f6f6fc;--match:#ded7ff;--match-ink:#4a339c;--selected:#6554dc;--danger:#b12b4a;--danger-bg:#ffe9ee;--shadow:0 14px 60px #28234b09;--glow:#dcd6ff;--warm:#a16213;--warm-bg:#fff5e6;font-family:Inter,'Segoe UI',system-ui,sans-serif;font-synthesis:none;background:var(--bg);color:var(--ink)}
:root[data-theme=dark]{color-scheme:dark;--bg:#12131d;--surface:#1c1e2d;--surface-soft:#242638;--ink:#eeeef8;--muted:#a4a6bf;--line:#33364d;--grid:#606582;--accent:#b7a4ff;--accent-hover:#c9bbff;--accent-soft:#302944;--axis:#30324b;--box:#252737;--match:#483d69;--match-ink:#e1d7ff;--selected:#8571df;--danger:#ff9cb0;--danger-bg:#4c2738;--shadow:0 16px 70px #00000024;--glow:#413369;--warm:#f2ca8a;--warm-bg:#372e29}
*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 88% 1%,var(--glow),transparent 35%),var(--bg);min-height:100vh;transition:background-color .25s,color .25s}button,select,a{-webkit-tap-highlight-color:transparent}a{color:var(--ink);text-decoration:none}a:hover{color:var(--accent)}header,main,footer{max-width:1240px;margin:auto;padding-inline:32px}header{min-height:90px;display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:10px;font-weight:750;font-size:16px;letter-spacing:-.5px}.brand-mark{display:grid;place-items:center;background:var(--ink);color:var(--surface);width:34px;height:36px;border-radius:11px;font:24px Georgia,serif;box-shadow:0 4px 12px #30235e14}.brand-section{font-size:9px;letter-spacing:2px;font-weight:600;margin-left:8px;padding-left:14px;border-left:1px solid var(--grid);color:var(--muted)}nav{display:flex;align-items:center;gap:24px;font-size:13px}nav>a{color:var(--muted)}button,select{font:inherit;min-height:44px;border:1px solid var(--line);border-radius:12px;background:var(--surface-soft);color:var(--ink);padding:11px 15px;cursor:pointer;transition:background-color .18s,color .18s,border-color .18s,box-shadow .18s,transform .18s}button:hover:not(:disabled){background:var(--accent-soft);color:var(--ink);border-color:var(--grid);transform:translateY(-1px)}button:active:not(:disabled){transform:translateY(0) scale(.98)}button:disabled{color:var(--muted);opacity:.55;cursor:default}button:focus-visible,select:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:4px}select{appearance:auto}.theme-toggle{background:var(--surface);box-shadow:var(--shadow);font-size:12px;white-space:nowrap}.intro{display:flex;align-items:center;justify-content:space-between;gap:35px;padding:48px 0 38px;animation:arrive .45s ease both}.eyebrow{font-size:10px;letter-spacing:2.2px;font-weight:700;color:var(--accent);line-height:1.7;margin:0 0 14px}h1{font-size:clamp(46px,6vw,76px);letter-spacing:-4px;line-height:1.05;font-weight:750;margin:0}h1 span{display:block;letter-spacing:0;font-size:16px;font-weight:400;line-height:1.7;color:var(--muted);margin-top:17px}.account{font-size:12px;max-width:265px;line-height:1.7;background:var(--surface);padding:12px 18px;border:1px solid var(--line);border-radius:40px;overflow-wrap:anywhere}.layout{display:grid;grid-template-columns:minmax(0,700px) minmax(0,330px);gap:28px;align-items:start;justify-content:space-between}.play,.panel{background:var(--surface);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:26px;min-width:0;animation:arrive .5s ease both}.panel{padding:25px;margin-bottom:20px;font-size:13px;line-height:1.85;animation-delay:.08s}.panel p{color:var(--muted)}h2{font-size:27px;letter-spacing:-1px;font-weight:650;line-height:1.25;margin:8px 0 15px}h3{font-size:14px;letter-spacing:-.2px;margin-top:27px}aside details{animation-delay:.15s}summary{cursor:pointer;font-size:15px;font-weight:650}summary::marker{color:var(--accent)}.mode-tabs{display:grid;grid-template-columns:1fr .9fr 1.3fr;background:var(--surface-soft);padding:5px;border:1px solid var(--line);border-radius:15px;gap:3px;margin-bottom:22px}.mode-tabs button{background:transparent;border:1px solid transparent;font-size:12px;padding:10px 8px;border-radius:10px;line-height:1.4}.mode-tabs button[aria-pressed=true]{background:var(--surface);color:var(--accent);box-shadow:0 3px 12px #241d5120;border-color:var(--line);font-weight:700}.mode-tabs button[aria-pressed=true]:hover{background:var(--surface);color:var(--accent)}.toolbar{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.toolbar label{display:grid;gap:6px;font-size:10px;color:var(--muted);letter-spacing:.4px}.toolbar select{font-size:13px;font-weight:600;min-width:116px}.timer-badge{border-left:1px solid var(--line);padding-left:14px;min-width:85px}.timer-badge small{display:block;font-size:9px;letter-spacing:1.4px;color:var(--muted);margin-bottom:5px}.timer-badge strong{font-size:26px;line-height:1;font-weight:650;letter-spacing:-1px;font-variant-numeric:tabular-nums}#start,#finish{background:var(--accent);color:var(--bg);border-color:transparent;font-size:12px;font-weight:650}#start:hover:not(:disabled),#finish:hover:not(:disabled){background:var(--accent-hover);color:var(--bg);border-color:transparent;box-shadow:0 6px 20px #6554dc26}#fresh{font-size:12px}#mode{font-size:11px;color:var(--muted);line-height:1.8;margin:19px 0}.board-heading{display:flex;justify-content:space-between;align-items:center;margin-top:22px;gap:12px}.board-heading h2{font-size:13px;letter-spacing:0;margin:0;font-weight:700}.board-heading>span{font-size:10px;color:var(--muted)}
#board{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));aspect-ratio:1;border:2px solid var(--grid);border-radius:13px;overflow:hidden;margin:13px 0 0;background:var(--surface);isolation:isolate}
#board button{position:relative;display:grid;place-items:center;min-width:0;min-height:0;padding:0;border:0;border-right:1px solid var(--line);border-bottom:1px solid var(--line);border-radius:0;background:var(--surface);font-size:clamp(20px,2.7vw,33px);line-height:1;color:var(--ink);font-weight:450;font-variant-numeric:tabular-nums;transition:background-color .14s ease,color .14s ease,box-shadow .14s ease;transform:none;cursor:pointer}
#board button:hover:not(:disabled){background:var(--accent-soft);transform:none;border-color:var(--line);color:var(--ink)}
#board button:nth-child(3n){border-right:2px solid var(--grid)}#board button:nth-child(9n){border-right:0}#board button:nth-child(n+19):nth-child(-n+27),#board button:nth-child(n+46):nth-child(-n+54){border-bottom:2px solid var(--grid)}#board button:nth-child(n+73){border-bottom:0}
#board .given{font-weight:700}#board .entered{color:var(--accent)}#board .box-peer{background:var(--box)}#board .line-peer{background:var(--axis)}#board .same-digit{background:var(--match);color:var(--match-ink);font-weight:750;box-shadow:inset 0 0 0 1px var(--accent)}#board .selected,#board .selected:hover:not(:disabled){background:var(--selected);color:#fff;box-shadow:inset 0 0 0 2px var(--accent);z-index:1;animation:selection .28s ease-out}#board .conflict{background:var(--danger-bg);color:var(--danger)}#board .selected.conflict{box-shadow:inset 0 0 0 3px var(--danger)}#board button:disabled{opacity:1;cursor:default}#board button:focus-visible{outline:0;box-shadow:inset 0 0 0 3px var(--accent);z-index:2}.cell-value{pointer-events:none}.cell-value.placed{animation:placed .24s ease-out}.cell-notes{display:grid;grid-template-columns:repeat(3,1fr);align-items:center;justify-items:center;width:100%;height:100%;padding:4px;pointer-events:none}.cell-notes span{font-size:clamp(9px,1.1vw,13px);color:var(--muted);font-weight:500;line-height:1}.selected .cell-notes span{color:#fff}
.completion{display:flex;align-items:center;gap:20px;margin:14px 0 17px}.tip{font-size:11px;line-height:1.8;color:var(--muted)}#progress{margin:0;flex:1 1 auto;font-size:11px}progress{appearance:none;width:95px;height:4px;border:0;border-radius:8px;overflow:hidden;background:var(--line);accent-color:var(--accent);flex-shrink:0}progress::-webkit-progress-bar{background:var(--line)}progress::-webkit-progress-value{background:var(--accent);border-radius:8px;transition:width .3s}progress::-moz-progress-bar{background:var(--accent)}.pencil-tools{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:14px}.pencil-tools button{font-size:11px;padding-inline:12px}.pencil-tools #selection{margin-left:auto;font-size:10px}#pencil[aria-pressed=true]{background:var(--accent-soft);border-color:var(--accent);color:var(--accent);font-weight:700}#digits{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));gap:6px;background:var(--surface);padding:6px 0;border-radius:12px}#digits button{font-size:23px;font-weight:600;min-height:51px;padding:4px 0;touch-action:manipulation;border-radius:10px;color:var(--accent)}#digits button.digit-active{background:var(--accent);color:var(--bg);border-color:transparent;box-shadow:0 3px 8px #6554dc26}.actions{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin-top:14px}.actions button{font-size:11px;line-height:1.5;padding:10px 5px}#status{font-size:12px;line-height:1.8;padding:14px 16px;border-radius:12px;border:1px solid var(--line);background:var(--surface-soft);min-height:50px;margin:20px 0 13px}body[data-round-state=won] #status{background:var(--accent-soft);color:var(--accent);border-color:var(--accent)}body[data-round-state=failed] #status{background:var(--danger-bg);color:var(--danger)}.challenge-rules{background:var(--warm-bg);border:1px solid var(--line);color:var(--warm);padding:14px;border-radius:12px;font-size:12px;line-height:1.8}.challenge-rules[hidden]{display:none}#ranking,#history{padding-left:22px;color:var(--muted);font-size:12px}#ranking li{padding:12px 0 12px 5px;border-bottom:1px solid var(--line);overflow-wrap:anywhere}#ranking li::marker{color:var(--accent);font-weight:750}#history li{padding:6px 0;overflow-wrap:anywhere}#refresh{font-size:11px;width:100%;margin:4px 0}footer{padding-block:30px 40px;font-size:12px;color:var(--muted);line-height:1.8}footer a{color:var(--muted)}[hidden]{display:none!important}
@keyframes arrive{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}@keyframes placed{from{opacity:.35;transform:scale(.76)}to{opacity:1;transform:scale(1)}}@keyframes selection{from{box-shadow:inset 0 0 0 5px var(--accent)}to{box-shadow:inset 0 0 0 2px var(--accent)}}
@media(min-width:801px) and (max-width:1000px){.layout{grid-template-columns:minmax(0,1fr) minmax(0,280px);gap:20px}.play{padding:20px}.toolbar{gap:10px}.pencil-tools #selection{width:100%;margin-left:0}.actions{grid-template-columns:repeat(2,1fr)}}
@media(max-width:800px){header,main,footer{padding-inline:20px}header{min-height:78px;gap:15px}.brand{font-size:14px}.brand-section{display:none}nav{gap:14px;font-size:12px}.layout{grid-template-columns:minmax(0,1fr);gap:20px}.intro{padding:32px 0;gap:22px}h1{font-size:56px;letter-spacing:-3px}h1 span{font-size:14px}.account{font-size:11px;padding:10px 14px}.play{max-width:650px;width:100%;margin:auto}.panel{margin-bottom:16px}aside{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;align-items:start}#digits{position:sticky;bottom:8px;z-index:5;box-shadow:0 6px 24px #20204418}#board button{font-size:clamp(20px,4.3vw,32px)}.cell-notes span{font-size:clamp(9px,2vw,13px)}}
@media(max-width:550px){header,main,footer{padding-inline:14px}header{align-items:center;flex-wrap:wrap;gap:12px;padding-block:15px}.brand-mark{width:29px;height:31px;font-size:20px}nav{flex:1;justify-content:flex-end;gap:12px}nav>a{font-size:11px}.theme-toggle{font-size:0;padding:8px 11px;min-width:42px}.theme-toggle::first-letter{font-size:19px}.intro{display:block;padding:27px 0 23px}.eyebrow{font-size:9px;letter-spacing:1.8px}h1{font-size:54px}h1 span{font-size:13px;margin-top:12px}.account{display:inline-block;margin-top:18px;max-width:100%}.play,.panel{padding:16px;border-radius:19px}.mode-tabs{margin-bottom:19px}.mode-tabs button{font-size:10px;padding:8px 4px}.toolbar{gap:13px}.toolbar label{font-size:9px}.toolbar select{min-width:98px;padding:9px;font-size:12px}.timer-badge{min-width:73px;padding-left:12px}.timer-badge strong{font-size:25px}#start{flex:1 1 105px;padding:10px 9px;font-size:11px}.board-heading{margin-top:17px}.board-heading h2{font-size:12px}.board-heading>span{font-size:9px}#board{border-radius:9px}.cell-notes{padding:2px}.completion{gap:8px}progress{width:60px}#progress{font-size:10px}.pencil-tools{gap:7px}.pencil-tools button{flex:1;font-size:10px;padding-inline:8px}.pencil-tools #selection{width:100%;margin:0;font-size:10px}.actions{grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}.actions button{font-size:11px}#digits{gap:4px}#digits button{font-size:20px;min-height:44px;border-radius:8px}aside{display:block}.panel{line-height:1.8}.challenge-rules{font-size:11px}#status{padding:12px;font-size:11px}.tip{font-size:10px}h2{font-size:25px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
.theme-toggle{display:inline-flex;align-items:center;justify-content:center;gap:8px}.theme-icon{font-size:17px;line-height:1}.theme-label{font-size:12px}#board .selected.conflict,#board .selected.conflict:hover:not(:disabled){background:var(--danger-bg);color:var(--danger);box-shadow:inset 0 0 0 3px var(--danger)}@media(max-width:550px){.theme-label{display:none}.theme-toggle::first-letter{font-size:inherit}}
html.theme-switching *,html.theme-switching *::before,html.theme-switching *::after{transition:none!important}
.save-state{font-size:10px;color:var(--muted);line-height:1.7;margin:12px 0 0;min-height:17px}.sudoku-notices{position:fixed;right:22px;bottom:22px;width:min(380px,calc(100vw - 28px));display:grid;gap:10px;z-index:1000;pointer-events:none}.sudoku-notice{display:flex;align-items:center;gap:14px;background:var(--surface);color:var(--ink);border:1px solid var(--line);border-left:4px solid var(--accent);box-shadow:0 12px 45px #11112224;border-radius:14px;padding:14px 14px 14px 17px;font-size:13px;line-height:1.6;pointer-events:auto;animation:arrive .23s ease both}.sudoku-notice.warning{border-left-color:var(--warm)}.sudoku-notice.error{border-left-color:var(--danger)}.sudoku-notice>span{flex:1;overflow-wrap:anywhere}.sudoku-notice button{border:0;min-height:36px;min-width:36px;padding:4px;font-size:22px;background:transparent;color:var(--muted)}.result-dialog{box-sizing:border-box;width:min(490px,calc(100vw - 28px));max-height:calc(100dvh - 32px);overflow:auto;border:1px solid var(--line);border-radius:28px;background:var(--surface);color:var(--ink);padding:38px 30px 28px;box-shadow:0 24px 100px #00000050;text-align:center;animation:result-in .3s ease both}.result-dialog::backdrop{background:#10101db0;backdrop-filter:blur(7px)}.result-dialog .result-close{position:absolute;top:12px;right:12px;min-width:40px;min-height:40px;padding:3px;font-size:26px;border:0;border-radius:50%;color:var(--muted);background:transparent}.result-emblem{width:82px;height:82px;margin:0 auto 22px;display:grid;place-items:center;background:var(--accent-soft);border:1px solid var(--line);border-radius:26px;position:relative;color:var(--accent)}.result-emblem>span{font-size:46px;animation:result-star .6s ease both}.result-emblem i{position:absolute;width:5px;height:9px;border-radius:2px;background:var(--accent);transform:rotate(calc(var(--i)*30deg)) translateY(-65px);animation:result-spark 1s ease-out both;animation-delay:calc(var(--i)*.025s);pointer-events:none}.result-dialog[data-outcome=failed] .result-emblem{color:var(--warm);background:var(--warm-bg)}.result-dialog h2{font-size:30px;letter-spacing:-1px;line-height:1.25;margin:0 0 14px}.result-dialog>p{font-size:13px;line-height:1.8;color:var(--muted);margin:12px 0}.result-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:24px 0;background:var(--surface-soft);border:1px solid var(--line);border-radius:16px;padding:18px 8px}.result-stats strong{display:block;font-size:24px;font-variant-numeric:tabular-nums;font-weight:650}.result-stats small{display:block;font-size:10px;color:var(--muted);margin-top:7px}.result-dialog .result-saved{color:var(--ink);font-weight:650}.result-ranking{font-size:11px!important}.result-actions{display:grid;gap:9px;margin-top:23px}.result-actions button{font-size:13px;min-height:46px}.result-actions .result-primary{background:var(--accent);color:var(--bg);border-color:transparent;font-weight:650}.result-actions .result-primary:hover{background:var(--accent-hover);color:var(--bg)}@keyframes result-in{from{opacity:0;transform:translateY(12px) scale(.97)}to{opacity:1;transform:none}}@keyframes result-star{from{opacity:0;transform:scale(.5) rotate(-20deg)}to{opacity:1;transform:none}}@keyframes result-spark{0%{opacity:0;transform:rotate(calc(var(--i)*30deg)) translateY(-25px)}25%{opacity:.8}100%{opacity:0;transform:rotate(calc(var(--i)*30deg)) translateY(-80px)}}@media(max-width:550px){.sudoku-notices{right:14px;bottom:14px}.result-dialog{padding:32px 20px 22px;border-radius:23px}.result-dialog h2{font-size:27px}.result-dialog>p{font-size:12px}.result-emblem{margin-bottom:18px}.sudoku-notice{font-size:12px}}@media(prefers-reduced-motion:reduce){.result-dialog,.result-emblem>span,.result-emblem i,.sudoku-notice{animation:none!important}.result-emblem i{display:none}}
/* Touch controls keep scrolling native: input is committed only by a completed tap. */
button,select{touch-action:manipulation}#board{touch-action:pan-y pinch-zoom;scroll-margin-top:12px;user-select:none;-webkit-user-select:none}#board button{touch-action:manipulation;-webkit-user-select:none;user-select:none}#board button:active:not(:disabled){transform:none;box-shadow:inset 0 0 0 3px var(--accent)}#board .selected{animation:none}#board .given.selected{background:var(--selected);color:#fff}.input-dock{background:var(--surface);border-radius:14px}#digits{grid-template-columns:repeat(10,minmax(0,1fr));position:static;box-shadow:none}#digits button{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-height:60px;transform:none}#digits button small{font-size:10px;line-height:1;color:var(--muted);font-weight:500}#digits .digit-active small{color:inherit}#digits .digit-complete:not(.digit-active){background:var(--surface-soft);color:var(--muted)}#digits #erase{font-size:25px;color:var(--ink)}.pencil-tools #selection{flex:1 0 100%;margin:0;min-height:19px}.pencil-tools button{min-height:46px}.pencil-tools{margin-bottom:3px}.actions{grid-template-columns:repeat(3,minmax(0,1fr))}#digits button:disabled{opacity:.5}.sudoku-notices{top:max(14px,env(safe-area-inset-top));bottom:auto}
@media(hover:none){button:hover:not(:disabled){transform:none}#board button:hover:not(.selected):not(.same-digit):not(.line-peer):not(.box-peer):not(.conflict){background:var(--surface)}#digits button:hover:not(.digit-active){background:var(--surface-soft)}}
@media(max-width:800px){.input-dock{position:sticky;bottom:0;z-index:6;padding:10px 0 max(8px,env(safe-area-inset-bottom));border-top:1px solid var(--line);box-shadow:0 -12px 20px -18px #16162d66}#digits{grid-template-columns:repeat(5,minmax(0,1fr));gap:6px;padding:4px 0}#digits button{min-height:48px;font-size:24px;flex-direction:row;gap:9px;border-radius:11px}#digits button small{font-size:10px}.pencil-tools{gap:8px}.pencil-tools button{flex:1;font-size:12px}.pencil-tools #selection{font-size:11px}.has-round .intro{padding:14px 0}.has-round .intro h1{font-size:30px;letter-spacing:-1px}.has-round .intro .eyebrow,.has-round .intro h1 span,.has-round .account{display:none}.has-round #mode{margin:8px 0;font-size:10px}.has-round .board-heading{margin-top:10px}.completion{margin:9px 0}#board button{font-size:clamp(21px,5vw,33px)}.cell-notes span{font-size:clamp(10px,2.3vw,14px)}}
@media(max-width:550px){header,main,footer{padding-inline:8px}.play{padding:10px;border-radius:16px}.toolbar{gap:8px}.mode-tabs{margin-bottom:12px}.toolbar select{font-size:16px;min-width:102px;padding:8px}.mode-tabs button{min-height:46px}#board{border-radius:6px;margin-top:8px}.actions{grid-template-columns:repeat(2,minmax(0,1fr))}.actions button{min-height:46px}.input-dock{border-radius:0}.pencil-tools #selection{font-size:10px}.cell-notes{padding:1px}#digits button{min-height:46px}.has-round header{padding-block:9px;min-height:58px}}
@media(max-height:550px) and (orientation:landscape){.input-dock{position:static}.has-round .intro{display:none}}
.play{overflow-anchor:none}
/* Seasonal skins retain the same geometry and independent light/dark contrast. */
:root[data-skin=autumn]{--skin-hue:25;--skin-saturation:66%}:root[data-skin=winter]{--skin-hue:208;--skin-saturation:69%}:root[data-skin=spring]{--skin-hue:329;--skin-saturation:55%}:root[data-skin=summer]{--skin-hue:35;--skin-saturation:83%}:root[data-skin=space]{--skin-hue:256;--skin-saturation:62%}
:root[data-skin]:not([data-skin=classic]){--bg:hsl(var(--skin-hue) 38% 96%);--surface:#fff;--surface-soft:hsl(var(--skin-hue) 40% 98%);--ink:hsl(var(--skin-hue) 27% 18%);--muted:hsl(var(--skin-hue) 15% 42%);--line:hsl(var(--skin-hue) 25% 87%);--grid:hsl(var(--skin-hue) 23% 67%);--accent:hsl(var(--skin-hue) var(--skin-saturation) 37%);--accent-hover:hsl(var(--skin-hue) var(--skin-saturation) 30%);--accent-soft:hsl(var(--skin-hue) 65% 94%);--axis:hsl(var(--skin-hue) 48% 93%);--box:hsl(var(--skin-hue) 35% 97%);--match:hsl(var(--skin-hue) 65% 86%);--match-ink:hsl(var(--skin-hue) 65% 25%);--selected:hsl(var(--skin-hue) var(--skin-saturation) 37%);--glow:hsl(var(--skin-hue) 65% 89%)}
:root[data-theme=dark][data-skin]:not([data-skin=classic]){--bg:hsl(var(--skin-hue) 22% 8%);--surface:hsl(var(--skin-hue) 20% 12%);--surface-soft:hsl(var(--skin-hue) 18% 16%);--ink:hsl(var(--skin-hue) 25% 94%);--muted:hsl(var(--skin-hue) 18% 70%);--line:hsl(var(--skin-hue) 17% 24%);--grid:hsl(var(--skin-hue) 20% 42%);--accent:hsl(var(--skin-hue) 80% 76%);--accent-hover:hsl(var(--skin-hue) 82% 84%);--accent-soft:hsl(var(--skin-hue) 30% 21%);--axis:hsl(var(--skin-hue) 28% 22%);--box:hsl(var(--skin-hue) 21% 17%);--match:hsl(var(--skin-hue) 35% 30%);--match-ink:hsl(var(--skin-hue) 70% 88%);--selected:hsl(var(--skin-hue) 43% 36%);--glow:hsl(var(--skin-hue) 35% 19%)}
.skin-picker{margin:0 0 24px;padding:15px 18px;border:1px solid var(--line);border-radius:18px;background:var(--surface);box-shadow:var(--shadow)}.skin-picker summary{font-size:13px;line-height:1.7;min-height:28px}.skin-picker summary span{color:var(--accent);font-weight:500;margin-left:12px}.skin-picker p{color:var(--muted);font-size:11px;line-height:1.7;margin:12px 0 0}#skin-choices{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:8px;margin-top:16px}#skin-choices button{display:flex;align-items:center;justify-content:center;flex-direction:column;gap:9px;min-height:85px;font-size:12px;padding:12px 5px;transform:none}#skin-choices button[aria-pressed=true]{background:var(--accent-soft);border-color:var(--accent);color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent);font-weight:700}.skin-icon{display:grid;place-items:center;font-size:25px;width:40px;height:34px;line-height:1}
.challenge-story{position:relative;display:flex;gap:18px;align-items:center;overflow:hidden;border:1px solid var(--line);background:var(--accent-soft);border-radius:17px;padding:20px;margin:19px 0 12px;isolation:isolate}.challenge-story::after{content:'';position:absolute;width:180px;height:180px;border:24px double var(--grid);border-radius:40% 60% 45% 55%;opacity:.14;right:-70px;top:-60px;z-index:-1;transform:rotate(25deg)}#challenge-icon{font-size:40px;flex-shrink:0;line-height:1.2}.challenge-story .eyebrow{font-size:8px;letter-spacing:1.5px;margin:0 0 6px}.challenge-story h2{font-size:23px;letter-spacing:-.6px;margin:0 0 8px}.challenge-story p{font-size:12px;line-height:1.7;margin:0;color:var(--muted)}.challenge-story #challenge-goal{font-size:11px;font-weight:650;color:var(--ink);margin-top:10px}.challenge-story[data-season=autumn]{border-left:4px solid #b8602c}.challenge-story[data-season=winter]{border-left:4px solid #478bcb}.challenge-story[data-season=spring]{border-left:4px solid #c9518b}.challenge-story[data-season=summer]{border-left:4px solid #c28a20}
@media(max-width:800px){#skin-choices{grid-template-columns:repeat(4,minmax(0,1fr))}.skin-picker{margin-bottom:16px}.has-round .skin-picker{padding-block:9px;margin-bottom:12px}}
@media(max-width:550px){.skin-picker{padding:12px}.skin-picker summary{font-size:12px;min-height:30px}.skin-picker summary span{margin-left:8px}#skin-choices{gap:6px}#skin-choices button{min-height:74px;font-size:11px}.skin-icon{font-size:23px}.challenge-story{padding:14px;gap:11px}.challenge-story h2{font-size:20px}#challenge-icon{font-size:30px}.challenge-story p{font-size:11px}}
body:not(.has-round) .input-dock{display:none}body:not(.board-visible) .input-dock{position:static;box-shadow:none}
.board-scene{position:relative;isolation:isolate;padding:12px;background:var(--accent-soft);border:1px solid var(--line);border-radius:21px;margin-top:12px}.board-scene #board{position:relative;z-index:1;margin:0}.board-art{position:absolute;inset:0;z-index:0;border-radius:inherit;background-size:120px 120px;opacity:.65;pointer-events:none}:root[data-skin=autumn] .board-art{background-image:url('./art/autumn.svg')}:root[data-skin=winter] .board-art{background-image:url('./art/winter.svg')}:root[data-skin=spring] .board-art{background-image:url('./art/spring.svg')}:root[data-skin=summer] .board-art{background-image:url('./art/summer.svg')}:root[data-skin=space] .board-art{background-image:url('./art/space.svg')}
#board-effects{position:absolute;inset:14px;z-index:2;border-radius:10px;overflow:hidden;pointer-events:none}.unit-wave{position:absolute;border:2px solid var(--accent);border-radius:3px;background:linear-gradient(110deg,transparent,var(--accent-soft),transparent);box-shadow:inset 0 0 15px var(--glow);animation:unit-complete .9s ease-out both;pointer-events:none}#milestone-status{min-height:0;margin:0;font-size:11px;color:var(--accent);line-height:1.6}#milestone-status:not(:empty){margin-top:8px}#focus-toggle{min-height:44px;font-size:11px;font-weight:600;padding:9px 12px;white-space:nowrap}#focus-toggle[aria-pressed=true]{background:var(--accent-soft);color:var(--accent);border-color:var(--accent)}@keyframes unit-complete{0%{opacity:0}25%{opacity:.7}100%{opacity:0}}
.focus-mode header,.focus-mode .intro,.focus-mode .skin-picker,.focus-mode aside,.focus-mode footer,.focus-mode .mode-tabs,.focus-mode #mode,.focus-mode #challenge-rules,.focus-mode .challenge-story,.focus-mode .play>.tip,.focus-mode .actions{display:none!important}.focus-mode main{max-width:660px;padding:12px}.focus-mode .layout{display:block}.focus-mode .play{position:relative;padding:18px;animation:none}.focus-mode .toolbar{position:absolute;top:18px;left:18px}.focus-mode .toolbar>label,.focus-mode #start,.focus-mode #fresh{display:none!important}.focus-mode .timer-badge{border:0;padding-left:0}.focus-mode .board-heading{min-height:47px;margin:0 0 10px;justify-content:flex-end}.focus-mode .board-heading h2{display:none}.focus-mode .board-scene{margin-top:0}.focus-mode #status{margin-top:10px;margin-bottom:0}.focus-mode .save-state{margin-top:7px}.focus-mode #focus-toggle{max-width:70%}
@media(max-width:550px){.board-scene{padding:6px;border-radius:13px}#board-effects{inset:8px;border-radius:5px}.board-art{background-size:90px 90px}.focus-mode main{padding:6px}.focus-mode .play{padding:10px}.focus-mode .toolbar{top:12px;left:12px}.focus-mode .board-heading{margin-bottom:8px}#focus-toggle{font-size:10px;padding:8px}.focus-mode .input-dock{padding-bottom:max(8px,env(safe-area-inset-bottom))}}@media(prefers-reduced-motion:reduce){.unit-wave{animation:none!important;display:none}}
/* Finish screens borrow their motifs from the selected skin. */
.result-dialog{isolation:isolate}.result-dialog::before{content:'';position:absolute;inset:0 0 auto;height:165px;z-index:-1;pointer-events:none;background-repeat:repeat;background-size:100px 100px;opacity:.16;mask-image:linear-gradient(#000,transparent)}.result-dialog[data-skin=autumn][data-outcome=won]::before{background-image:url('./art/autumn.svg')}.result-dialog[data-skin=winter][data-outcome=won]::before{background-image:url('./art/winter.svg')}.result-dialog[data-skin=spring][data-outcome=won]::before{background-image:url('./art/spring.svg')}.result-dialog[data-skin=summer][data-outcome=won]::before{background-image:url('./art/summer.svg')}.result-dialog[data-skin=space][data-outcome=won]::before{background-image:url('./art/space.svg')}.result-dialog .result-skin{font-size:10px;letter-spacing:.7px;color:var(--accent);margin:0 0 10px}.result-emblem i.season-particle{background:none;border:0;border-radius:0;font-style:normal;font-size:17px;width:22px;height:22px;line-height:22px;color:var(--accent);text-align:center}.result-dialog[data-replay=true],.result-dialog[data-replay=true] .result-emblem>span{animation:none}.result-dialog[data-outcome=failed] .result-skin{color:var(--warm)}
#rank-podium{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px;align-items:start;margin:18px 0 14px}#rank-podium[hidden]{display:none}.podium-card{display:flex;flex-direction:column;align-items:center;text-align:center;gap:7px;min-width:0;padding:14px 6px 12px;border:1px solid var(--line);border-radius:15px;background:var(--surface-soft);margin-top:18px}.podium-card[data-place="1"]{grid-column:2;grid-row:1;margin-top:0;min-height:166px;background:var(--accent-soft);border-color:var(--grid)}.podium-card[data-place="2"]{grid-column:1;grid-row:1}.podium-card[data-place="3"]{grid-column:3;grid-row:1}.podium-medal{font-size:25px;line-height:1.3}.podium-place{font-size:9px;color:var(--muted)}.podium-name{font-size:11px;line-height:1.5;font-weight:650;overflow-wrap:anywhere;width:100%}.podium-time{font-size:17px;font-weight:700;line-height:1.3;font-variant-numeric:tabular-nums;letter-spacing:-.5px;margin-top:auto;color:var(--accent)}.podium-card.is-self{box-shadow:inset 0 0 0 2px var(--accent)}#ranking{padding:0;list-style:none;margin:0}#ranking .ranking-row{display:grid;grid-template-columns:24px minmax(0,1fr) auto;gap:7px;align-items:center;padding:12px 9px;font-size:12px;line-height:1.6;border-radius:9px}#ranking .ranking-row.is-self{background:var(--accent-soft);color:var(--ink);box-shadow:inset 3px 0 var(--accent)}.ranking-place{font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums}.ranking-name{overflow-wrap:anywhere}.ranking-seconds{font-size:12px;white-space:nowrap;font-variant-numeric:tabular-nums;color:var(--ink)}#ranking .ranking-empty{padding:16px 12px;list-style:none;text-align:center;border:1px dashed var(--grid);border-radius:12px;color:var(--muted);font-size:12px;line-height:1.8}
.cell-feedback{position:absolute;display:grid;place-items:center;width:11.111111%;height:11.111111%;font-size:clamp(20px,4.5vw,32px);font-variant-numeric:tabular-nums;color:var(--accent);pointer-events:none;line-height:1}.feedback-erase{animation:erase-digit .4s ease-out both}.feedback-mistake{border:3px solid var(--danger);border-radius:4px;animation:mistake-ring .4s ease-out both}.note-added{animation:note-appear .2s ease-out both}.notes-mode .input-dock{border-top:2px dashed var(--accent)}.notes-mode #board .selected{outline:2px dashed #fff;outline-offset:-5px}.notes-mode #digits .digit-key:not(.digit-active){background:var(--accent-soft);border-style:dashed}.notes-mode #digits .digit-key>span{font-size:18px;font-weight:500}.notes-mode #selection{color:var(--accent);font-weight:650}@keyframes erase-digit{0%{opacity:.7;transform:scale(1)}100%{opacity:0;transform:scale(.6) translateY(-9px)}}@keyframes mistake-ring{0%{opacity:1}100%{opacity:0}}@keyframes note-appear{from{opacity:.2;transform:scale(.6)}to{opacity:1;transform:scale(1)}}@media(max-width:550px){.podium-name{font-size:12px}.podium-card{padding:12px 7px}.podium-time{font-size:18px}}@media(prefers-reduced-motion:reduce){.cell-feedback{display:none}.note-added{animation:none!important}.result-dialog::before{opacity:.1}}
.ui-icon{display:inline-block;width:18px;height:18px;flex-shrink:0;vertical-align:middle;pointer-events:none}button:has(>.ui-icon){display:inline-flex;align-items:center;justify-content:center;gap:7px}.theme-icon{display:inline-flex}.theme-icon .ui-icon{width:19px;height:19px}.skin-icon{width:18px;height:20px;font-size:0}.skin-icon .ui-icon{width:18px;height:18px}#skin-choices button{position:relative;gap:11px;padding:13px 8px 11px;border-radius:16px;min-width:0;overflow:hidden}#skin-choices .skin-choice-label{display:flex;align-items:center;justify-content:center;gap:7px;font-size:12px;line-height:1.5;min-height:24px}.skin-check{position:absolute;right:6px;top:6px;width:22px;height:22px;border-radius:50%;display:none;place-items:center;background:var(--accent);color:var(--bg);box-shadow:0 2px 8px #00000012;z-index:1}.skin-check .ui-icon{width:15px;height:15px}#skin-choices button[aria-pressed=true] .skin-check{display:grid}
.skin-preview{--preview-hue:249;--preview-sat:65%;--pbg:hsl(var(--preview-hue) 45% 96%);--pcell:#fff;--pink:hsl(var(--preview-hue) 25% 20%);--paxis:hsl(var(--preview-hue) 45% 93%);--pmatch:hsl(var(--preview-hue) 65% 85%);--pline:hsl(var(--preview-hue) 25% 84%);--pgrid:hsl(var(--preview-hue) 25% 62%);--pselected:hsl(var(--preview-hue) var(--preview-sat) 37%);display:block;width:100%;max-width:116px;aspect-ratio:1;padding:6px;border-radius:12px;background:var(--pbg);border:1px solid var(--pline);pointer-events:none}.skin-preview[data-preview-skin=autumn]{--preview-hue:25;--preview-sat:66%}.skin-preview[data-preview-skin=winter]{--preview-hue:208;--preview-sat:69%}.skin-preview[data-preview-skin=spring]{--preview-hue:329;--preview-sat:55%}.skin-preview[data-preview-skin=summer]{--preview-hue:35;--preview-sat:83%}.skin-preview[data-preview-skin=space]{--preview-hue:256;--preview-sat:62%}:root[data-theme=dark] .skin-preview{--pbg:hsl(var(--preview-hue) 22% 12%);--pcell:hsl(var(--preview-hue) 20% 16%);--pink:hsl(var(--preview-hue) 25% 94%);--paxis:hsl(var(--preview-hue) 28% 23%);--pmatch:hsl(var(--preview-hue) 35% 32%);--pline:hsl(var(--preview-hue) 17% 27%);--pgrid:hsl(var(--preview-hue) 20% 48%);--pselected:hsl(var(--preview-hue) 43% 36%)}.preview-grid{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));width:100%;height:100%;border:1px solid var(--pgrid);border-radius:3px;overflow:hidden;background:var(--pcell)}.preview-grid>span{display:grid;place-items:center;min-width:0;font-size:7px;font-weight:550;line-height:1;color:var(--pink);border-right:1px solid var(--pline);border-bottom:1px solid var(--pline);background:var(--pcell)}.preview-grid>span:nth-child(3n){border-right-color:var(--pgrid)}.preview-grid>span:nth-child(9n){border-right:0}.preview-grid>span:nth-child(n+19):nth-child(-n+27),.preview-grid>span:nth-child(n+46):nth-child(-n+54){border-bottom-color:var(--pgrid)}.preview-grid>span:nth-child(n+73){border-bottom:0}.preview-grid .preview-axis{background:var(--paxis)}.preview-grid .preview-match{background:var(--pmatch)}.preview-grid .preview-selected{background:var(--pselected);color:white;font-weight:750}
.challenge-story{--story-hue:25;--story-accent:hsl(var(--story-hue) 60% 36%);display:grid;grid-template-columns:minmax(0,1fr) 112px;gap:7px 12px;padding:20px;background:hsl(var(--story-hue) 55% 96%);border:1px solid hsl(var(--story-hue) 35% 80%);border-radius:20px}.challenge-story[data-season=winter]{--story-hue:208}.challenge-story[data-season=spring]{--story-hue:329}.challenge-story[data-season=summer]{--story-hue:35}.challenge-story::after{display:none}.challenge-story>div{display:contents}#challenge-icon{grid-column:2;grid-row:1/4;width:112px;line-height:0;font-size:0}#challenge-icon img{display:block;width:100%;height:auto}.challenge-story .eyebrow{grid-column:1;margin:0;color:var(--story-accent);font-size:8px;letter-spacing:1.25px}.challenge-story h2{grid-column:1;margin:0;font-size:25px;line-height:1.2;overflow-wrap:anywhere}.challenge-story #challenge-description{grid-column:1;font-size:12px;line-height:1.7}.challenge-story #challenge-goal{grid-column:1/-1;margin:7px 0 0;font-size:11px;font-weight:500;color:var(--muted)}.challenge-story .challenge-metrics{grid-column:1/-1;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px;margin-top:8px}.challenge-metric{display:flex;align-items:center;gap:6px;min-width:0;min-height:44px;padding:8px;background:var(--surface);border:1px solid var(--line);border-radius:11px;color:var(--ink);font-size:11px;font-weight:600;line-height:1.4}.challenge-metric .ui-icon{color:var(--story-accent);width:17px;height:17px}.challenge-metric>span{overflow-wrap:anywhere}:root[data-theme=dark] .challenge-story{--story-accent:hsl(var(--story-hue) 70% 74%);background:hsl(var(--story-hue) 27% 15%);border-color:hsl(var(--story-hue) 25% 30%)}.result-emblem>span{display:grid;place-items:center}.result-emblem>span>.ui-icon{width:44px;height:44px;stroke-width:1.3}.result-emblem i.season-particle>.ui-icon{width:19px;height:19px;stroke-width:1.7}.podium-medal .ui-icon{width:31px;height:31px;stroke-width:1.4}.podium-card[data-place="1"] .podium-medal{color:#ab751d}.podium-card[data-place="2"] .podium-medal{color:#778394}.podium-card[data-place="3"] .podium-medal{color:#ad6940}:root[data-theme=dark] .podium-card[data-place="1"] .podium-medal{color:#edc56c}:root[data-theme=dark] .podium-card[data-place="2"] .podium-medal{color:#bac7d6}:root[data-theme=dark] .podium-card[data-place="3"] .podium-medal{color:#e2a578}#digits #erase .ui-icon{width:24px;height:24px}#focus-toggle{gap:5px}#focus-toggle .ui-icon{width:15px;height:15px}.mode-tabs button{gap:4px}.mode-tabs .ui-icon{width:14px;height:14px}
@media(max-width:1000px){#skin-choices{grid-template-columns:repeat(4,minmax(0,1fr))}}
@media(max-width:550px){#skin-choices{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}#skin-choices button{padding:12px 9px 10px;gap:9px}#skin-choices .skin-choice-label{font-size:12px}.skin-preview{max-width:120px}.challenge-story{grid-template-columns:minmax(0,1fr) 80px;gap:7px 6px;padding:14px;border-radius:16px}#challenge-icon{width:80px}.challenge-story h2{font-size:22px}.challenge-story #challenge-description{font-size:11px}.challenge-story .eyebrow{font-size:7px;letter-spacing:1px}.challenge-story .challenge-metrics{gap:5px}.challenge-metric{padding:7px 5px;font-size:10px;gap:4px}.challenge-metric .ui-icon{width:15px;height:15px}.theme-toggle{font-size:12px}}