:root{color-scheme:dark;--bg:#17191b;--panel:#1e2124;--panel-raised:#25292d;--ink:#f2f3f4;--muted:#a3a8ad;--dim:#8a9299;--line:#35393d;--accent:#bdcddd;--accent-ink:#17191b;font-family:"Segoe UI Variable Text","Segoe UI","Helvetica Neue",Arial,sans-serif;font-synthesis:none}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button{color:inherit;cursor:pointer}button,a{touch-action:manipulation;-webkit-tap-highlight-color:transparent}button:disabled{opacity:.4;cursor:default}button,a,input{outline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--accent)}a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}[hidden]{display:none!important}::selection{color:var(--accent-ink);background:var(--accent)}button{transition:background .16s,border-color .16s,color .16s}h1,h2,h3,p{overflow-wrap:break-word}h1,h2,h3{margin:0}button{min-width:0}
.puzzle-shell{max-width:1216px;margin:auto;padding:0 48px}.skip-link{position:fixed;top:12px;left:12px;z-index:20;background:var(--accent);color:var(--accent-ink);padding:12px 18px;transform:translateY(-180%)}.skip-link:focus{transform:none}.game-header{min-height:88px;display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line)}.collection-link{font-size:15px;letter-spacing:-.4px;font-weight:550}.collection-link>span{margin-right:10px;color:var(--accent)}.text-button{min-height:44px;padding:9px 2px;border:0;background:none;color:var(--muted);font-size:13px}.text-button:hover{color:var(--accent)}#rules-open>span{display:inline-flex;justify-content:center;align-items:center;border:1px solid var(--line);width:23px;height:23px;border-radius:50%;margin-left:9px;font-size:12px;color:var(--accent)}.game-hero{display:flex;align-items:center;justify-content:space-between;gap:36px;padding:41px 0 34px}.eyebrow{font-size:10px;font-weight:600;letter-spacing:1.8px;text-transform:uppercase;color:var(--muted);margin:0 0 11px}.game-hero h1{font-size:clamp(38px,5.3vw,66px);font-weight:400;letter-spacing:-.06em;line-height:1.12}.game-description{font-size:15px;color:var(--muted);max-width:64ch;line-height:1.7;margin:17px 0 0}.collection-progress{flex:0 0 118px;align-self:center;border-left:1px solid var(--line);padding-left:24px}.collection-progress>p{white-space:nowrap;margin:0;font-size:18px;color:var(--dim);font-variant-numeric:tabular-nums}.collection-progress strong{font-size:40px;color:var(--accent);font-weight:400;letter-spacing:-2px}.progress-label{font-size:11px;color:var(--muted)}.collection-progress progress{display:block;width:100%;height:3px;margin-top:15px;border:0;appearance:none;background:var(--line);color:var(--accent)}.collection-progress progress::-webkit-progress-bar{background:var(--line)}.collection-progress progress::-webkit-progress-value{background:var(--accent)}.collection-progress progress::-moz-progress-bar{background:var(--accent)}
.practice-nav{display:flex;align-items:center;justify-content:space-between;gap:28px;border-top:1px solid var(--line);padding:19px 0 24px}.difficulty-list{display:flex;align-items:stretch;border:1px solid var(--line);border-radius:7px;padding:4px;gap:4px}.difficulty-button{min-height:56px;padding:8px 17px;border:1px solid transparent;background:transparent;border-radius:4px;text-align:left;color:var(--muted)}.difficulty-button>span{display:block;font-size:13px;font-weight:550}.difficulty-button>small{display:block;font-size:10px;font-weight:400;line-height:1.4;margin-top:2px;color:var(--dim)}.difficulty-button:hover:not(:disabled){background:var(--panel-raised)}.difficulty-button[aria-pressed=true]{background:var(--panel-raised);border-color:var(--line);color:var(--accent)}.difficulty-button[aria-pressed=true]>small{color:var(--muted)}.puzzle-selection{display:flex;align-items:center;gap:16px}.puzzle-selection>.eyebrow{margin:0;font-size:9px;white-space:nowrap}.puzzle-list{display:flex;gap:7px;flex-wrap:wrap}.puzzle-button{position:relative;display:flex;justify-content:center;align-items:center;min-width:44px;min-height:44px;border:1px solid var(--line);border-radius:5px;background:transparent;font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums;padding:8px 11px}.puzzle-button:hover{background:var(--panel-raised);color:var(--ink)}.puzzle-button[aria-pressed=true]{border-color:var(--accent);color:var(--accent);background:color-mix(in srgb,var(--accent) 8%,var(--bg))}.puzzle-button.completed .completion-mark{position:absolute;top:1px;right:3px;line-height:1;font-size:9px;color:var(--accent)}
.workbench{display:grid;grid-template-columns:minmax(0,1fr) 252px;gap:20px;align-items:start}.play-card{min-width:0;border:1px solid var(--line);border-radius:9px;background:var(--panel);overflow:hidden}.puzzle-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:25px 28px 20px}.puzzle-heading .eyebrow{font-size:9px;margin-bottom:6px}.puzzle-heading h2{font-size:24px;font-weight:450;letter-spacing:-.7px;line-height:1.25}.puzzle-badge{white-space:nowrap;font-size:10px;color:var(--accent);border:1px solid var(--line);border-radius:20px;padding:5px 10px}.board-area{padding:0 28px 28px;min-width:0;min-height:280px}.board-area:focus{outline-offset:-5px}.session-panel{padding:21px 20px 20px;border:1px solid var(--line);border-radius:9px;background:#1b1e21}.session-heading{display:flex;justify-content:space-between;align-items:start;gap:10px}.session-heading .eyebrow{font-size:8px;line-height:1.6;margin:0}.session-dot{height:5px;width:5px;flex-shrink:0;border-radius:50%;background:var(--accent);margin-top:4px}.session-note{color:var(--muted);font-size:13px;line-height:1.7;margin:15px 0 19px}.game-actions{display:grid;gap:8px}.primary,.secondary{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:44px;border-radius:5px;padding:10px 13px;font-size:12px;line-height:1.5;font-weight:500}.primary{background:var(--accent);border:1px solid var(--accent);color:var(--accent-ink)}.primary:hover:not(:disabled){filter:brightness(1.09)}.secondary{border:1px solid var(--line);background:transparent;color:var(--ink)}.secondary:hover:not(:disabled){background:var(--panel-raised);border-color:#68727b}.game-actions .secondary{justify-content:flex-start}.game-actions .secondary>span{font-size:18px;line-height:1;color:var(--accent);width:19px}.game-status{margin:14px 0 0;min-height:38px;font-size:12px;line-height:1.65;color:var(--accent)}.help-section{border-top:1px solid var(--line);padding-top:18px;margin-top:14px}.help-section>.eyebrow{font-size:9px;margin-bottom:8px}.help-section>p:not(.eyebrow){color:var(--dim);font-size:11px;line-height:1.7;margin:0 0 14px}.hint-button{width:100%;justify-content:space-between;color:var(--accent)}.hint-card{border:1px solid color-mix(in srgb,var(--accent) 38%,var(--line));background:color-mix(in srgb,var(--accent) 5%,var(--panel));border-radius:5px;padding:15px;margin-top:15px}.hint-card>.eyebrow{font-size:8px;color:var(--accent);margin-bottom:8px}.hint-card>p:not(.eyebrow){font-size:12px;line-height:1.75;margin:0 0 14px;color:var(--ink)}.hint-card>.primary{width:100%;font-size:11px;min-height:42px;padding:9px 5px}.hint-card>.text-button{display:block;width:100%;font-size:11px;min-height:40px;padding-bottom:0}.win{border-top:1px solid color-mix(in srgb,var(--accent) 35%,var(--line));background:color-mix(in srgb,var(--accent) 7%,var(--panel));padding:23px 28px;display:grid;grid-template-columns:34px minmax(0,1fr);gap:0 14px}.win-symbol{grid-row:1/3;color:var(--accent);font-size:31px;line-height:1.2}.win .eyebrow{font-size:8px;margin-bottom:5px;color:var(--accent)}.win h3{font-size:24px;font-weight:450;letter-spacing:-.6px}.win p:not(.eyebrow){font-size:12px;color:var(--muted);margin:8px 0 17px;line-height:1.65}.win>.primary{grid-column:2;justify-self:start}.storage-note{color:var(--accent);font-size:12px;line-height:1.7;padding:14px 17px;border:1px solid var(--line);border-radius:5px;margin:20px 0}.game-footer{margin-top:35px;padding:23px 0 30px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:10px;color:var(--dim)}.game-footer a{min-height:32px;display:flex;align-items:center;gap:9px;color:var(--muted)}
dialog{width:min(570px,calc(100% - 28px));max-height:calc(100svh - 40px);overflow:auto;padding:33px;background:var(--panel);border:1px solid #626b74;color:var(--ink);border-radius:11px;box-shadow:0 25px 100px #0008}dialog::backdrop{background:#0e1115ce;backdrop-filter:blur(4px)}.dialog-close{position:absolute;right:10px;top:9px;width:44px;height:44px;font-size:27px;font-weight:300;background:transparent;border:0;color:var(--muted)}dialog>.eyebrow{margin-top:8px;font-size:9px}dialog h2{font-size:31px;letter-spacing:-1px;line-height:1.2;font-weight:400;margin:12px 35px 24px 0}.rules-list{counter-reset:rules;list-style:none;padding:0;margin:0}.rules-list>li{counter-increment:rules;position:relative;padding-left:41px;min-height:28px;margin:18px 0;color:var(--muted);font-size:13px;line-height:1.8}.rules-list>li:before{content:counter(rules);position:absolute;left:0;top:0;display:flex;align-items:center;justify-content:center;width:27px;height:27px;border:1px solid color-mix(in srgb,var(--accent) 30%,var(--line));border-radius:50%;color:var(--accent);font-size:11px}.rules-note{border-top:1px solid var(--line);padding-top:18px;font-size:12px;color:var(--dim);line-height:1.8;margin:23px 0}dialog>.primary{width:100%}
/* Low specificity lets each game's tiles own their shape and selection colors. */
:where(.board-area button){border:1px solid var(--line);border-radius:4px;background:var(--panel-raised);padding:8px 12px}
:where(.board-area button:hover:not(:disabled)){border-color:var(--accent);background:color-mix(in srgb,var(--accent) 10%,var(--panel-raised))}
@media(min-width:1400px){.puzzle-shell{padding-inline:32px}.game-hero{padding-top:49px;padding-bottom:40px}}
@media(max-width:1000px){.puzzle-shell{padding-inline:28px}.workbench{grid-template-columns:minmax(0,1fr) 226px;gap:16px}.session-panel{padding:20px 17px}.difficulty-button{padding-inline:12px}.puzzle-selection{gap:12px}.puzzle-selection>.eyebrow{display:none}.puzzle-heading{padding:22px 22px 19px}.board-area{padding:0 22px 24px}.win{padding:21px 22px}.game-description{max-width:53ch}}
@media(max-width:800px){.workbench{grid-template-columns:minmax(0,1fr)}.session-panel{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:0 24px;padding:22px}.session-heading{grid-column:1}.session-note{grid-column:1;margin:11px 0 16px}.game-actions{grid-column:1;display:flex;flex-wrap:wrap;gap:7px}.game-actions>.secondary{flex:1;padding-inline:9px}.game-status{grid-column:1;min-height:0;font-size:11px}.help-section{grid-column:2;grid-row:1/5;margin:0;border-top:0;border-left:1px solid var(--line);padding:0 0 0 24px}.help-section>.eyebrow{margin-top:0}.hint-card{grid-column:1/-1;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:0 20px}.hint-card>.eyebrow,.hint-card>p:not(.eyebrow){grid-column:1}.hint-card>.primary{grid-column:2;grid-row:1/3;align-self:center;padding-inline:15px;width:auto}.hint-card>.text-button{grid-column:2;grid-row:3;min-height:35px;padding:0}.hint-card>p:not(.eyebrow){margin-bottom:0}.game-footer{font-size:10px;row-gap:6px}.game-footer>span:last-child{width:100%}.game-hero{padding:32px 0 28px}.game-header{min-height:75px}}
@media(max-width:600px){.puzzle-shell{padding-inline:20px}.game-header{min-height:69px}.game-hero{align-items:flex-start;gap:20px;padding:29px 0 26px}.game-hero h1{font-size:42px}.game-description{font-size:13px;margin-top:13px}.eyebrow{font-size:9px;letter-spacing:1.5px}.collection-progress{flex-basis:72px;padding-left:15px;align-self:flex-start;margin-top:24px}.collection-progress>p{font-size:13px}.collection-progress strong{font-size:30px}.progress-label{font-size:9px}.collection-progress progress{margin-top:10px}.practice-nav{display:block;padding:16px 0 20px}.difficulty-list{width:100%;gap:3px}.difficulty-button{flex:1;padding:8px 11px;min-height:53px}.difficulty-button>small{font-size:9px}.puzzle-selection{margin-top:16px;justify-content:space-between}.puzzle-selection>.eyebrow{display:block;font-size:8px}.puzzle-button{min-width:44px;min-height:42px}.puzzle-heading{padding:20px 19px 17px;gap:10px}.puzzle-heading h2{font-size:23px}.puzzle-badge{font-size:9px;padding:4px 8px}.board-area{padding:0 17px 22px;min-height:240px}.session-panel{padding:20px;gap:0 18px}.help-section{padding-left:18px}.game-actions{display:grid}.game-actions .secondary{font-size:11px}.win{padding:21px 20px;grid-template-columns:27px minmax(0,1fr);gap:0 10px}.win h3{font-size:23px}.win-symbol{font-size:28px}.hint-card{gap:0 12px}.hint-card>.primary{padding-inline:10px;font-size:10px}.game-footer{margin-top:26px;column-gap:10px}.collection-link{font-size:14px}.text-button{font-size:12px}dialog{padding:28px 23px}}
@media(max-width:380px){.puzzle-shell{padding-inline:13px}.game-hero{gap:12px}.game-hero h1{font-size:36px}.game-description{font-size:12px}.collection-progress{flex-basis:59px;padding-left:11px}.collection-progress strong{font-size:26px}.progress-label{font-size:8px}.game-hero .eyebrow{font-size:8px;letter-spacing:1px}.difficulty-button{padding-inline:9px}.difficulty-button>small{font-size:8px}.puzzle-heading{padding-inline:14px}.puzzle-heading h2{font-size:22px}.puzzle-heading .eyebrow{font-size:8px}.puzzle-badge{font-size:8px}.board-area{padding-inline:12px}.session-panel{padding:17px;display:block}.session-note{font-size:12px}.game-actions{grid-template-columns:1fr 1fr}.game-status{min-height:0}.help-section{border-left:0;border-top:1px solid var(--line);padding:16px 0 0;margin-top:17px}.help-section>p:not(.eyebrow){margin-bottom:11px}.hint-card{display:block}.hint-card>p:not(.eyebrow){margin-bottom:15px}.hint-card>.primary{width:100%;font-size:11px}.hint-card>.text-button{margin-top:5px}.game-footer>span{font-size:9px}.game-footer>span:last-child{font-size:9px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important;scroll-behavior:auto!important}}