:root{--paper:#f4f6fb;--panel:#fff;--ink:#18293c;--muted:#617085;--line:#dce3ed;--accent:#3567ce;--soft:#e9f0ff}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,system-ui,sans-serif}body[data-theme=midnight]{--paper:#101c2a;--panel:#1a2a3c;--ink:#f0f5ff;--muted:#b7c6da;--line:#475b75;--accent:#93b9ff;--soft:#31496a}body[data-theme=contrast]{--paper:#fff;--panel:#fff;--ink:#000;--muted:#222;--line:#333;--accent:#0038a8;--soft:#dce8ff}button,a,select{touch-action:manipulation}button,select{font:inherit}button,a.button{cursor:pointer}button:disabled{cursor:default;opacity:.5}a{color:inherit}button:focus-visible,a:focus-visible,select:focus-visible{outline:3px solid #dc9334;outline-offset:3px}.nh-header{height:76px;border-bottom:1px solid var(--line);background:var(--panel);position:sticky;top:0;z-index:20}.nh-nav{max-width:1320px;padding:0 28px;height:100%;margin:auto;display:flex;align-items:center;gap:28px}.nh-brand{text-decoration:none;letter-spacing:.12em;font-size:18px;font-weight:850;white-space:nowrap}.nh-brand b{color:var(--accent);margin-right:9px}.nh-links{margin-left:auto;display:flex;align-items:center;gap:24px;font-size:14px}.nh-links a{text-decoration:none}.menu-toggle{display:none}.nh-nav button,.toolbar button,.toolbar select,.actions button,.themes select{border:1px solid var(--line);background:var(--panel);color:var(--ink);padding:11px 15px;border-radius:12px;min-height:44px}.nh-links .play-link{background:var(--ink);color:var(--paper);padding:11px 18px;border-radius:30px}main#sudoku-app{max-width:1320px;margin:auto;padding:40px 28px 70px;min-height:80vh}.eyebrow{font-size:12px;letter-spacing:.16em;text-transform:uppercase;font-weight:750;color:var(--muted)}h1{font-size:clamp(32px,4vw,52px);letter-spacing:-.045em;line-height:1.06;margin:12px 0 16px}p{line-height:1.6;color:var(--muted)}.intro-row{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:30px}.intro-row p{max-width:620px}.toolbar,.actions{display:flex;flex-wrap:wrap;align-items:center;gap:8px}.toolbar button[aria-pressed=true],.actions button[aria-pressed=true]{background:var(--ink);color:var(--paper)}.primary{background:var(--ink)!important;color:var(--paper)!important}.collection-hero{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;background:var(--panel);border:1px solid var(--line);padding:32px;border-radius:28px;margin-bottom:28px}.collection-hero img{width:100%;aspect-ratio:1.5;object-fit:cover;border-radius:18px}.collection-hero p{max-width:480px}.worlds{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:28px}.world-card{color:var(--ink);text-align:left;background:var(--panel);border:2px solid transparent;border-radius:18px;overflow:hidden;padding:0;box-shadow:0 4px 25px #1232}.world-card[aria-pressed=true]{border-color:var(--accent)}.world-card img{display:block;width:100%;aspect-ratio:1.5;object-fit:cover}.world-card div{padding:15px}.world-card strong{display:block;font-size:17px}.world-card small{color:var(--muted);display:block;margin-top:5px}.levels{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:24px}.level{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:18px;text-align:left;color:var(--ink)}.level-top,.level-bottom{display:flex;justify-content:space-between;gap:10px;font-size:14px}.level-bottom{margin-top:12px;color:var(--muted)}.mini-sudoku{display:grid;grid-template-columns:repeat(9,1fr);margin-top:15px;border:1px solid var(--muted);aspect-ratio:1}.mini-sudoku span{display:grid;place-items:center;border:.5px solid var(--line);font-size:12px;line-height:1}.mini-sudoku span:nth-child(3n){border-right-color:var(--muted)}.mini-sudoku span:nth-child(n+19):nth-child(-n+27),.mini-sudoku span:nth-child(n+46):nth-child(-n+54){border-bottom-color:var(--muted)}.play-top{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:22px}.play-top h1{font-size:32px;margin:7px 0}.play-layout{display:grid;grid-template-columns:minmax(320px,480px) minmax(320px,560px);gap:24px;align-items:start;justify-content:center}.classic .play-layout{grid-template-columns:minmax(320px,540px) minmax(250px,340px);justify-content:center}.puzzle-pane,.city-pane,.rules-pane{padding:24px;background:var(--panel);border:1px solid var(--line);border-radius:24px;min-width:0}.puzzle-board{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));aspect-ratio:1;border:2px solid var(--ink);border-radius:4px;overflow:hidden}.cell{padding:0;background:var(--panel);border:0;border-right:1px solid var(--line);border-bottom:1px solid var(--line);color:var(--accent);font-size:clamp(19px,2.1vw,28px);display:grid;place-items:center;position:relative;min-width:0;min-height:0;border-radius:0;opacity:1!important}.cell.given{color:var(--ink);font-weight:750}.cell.peer{background:var(--soft)}.cell.selected{background:var(--accent);color:var(--paper);box-shadow:inset 0 0 0 2px var(--ink)}.cell.error{color:#c22a42;background:#ffe2e7}.cell.edge-r{border-right:2px solid var(--ink)}.cell.edge-b{border-bottom:2px solid var(--ink)}.cell.completed:not(.selected){box-shadow:inset 0 0 0 1px #69a99d}.notes{display:grid;grid-template-columns:repeat(3,1fr);width:90%;height:90%;font-size:10px;color:var(--muted)}.notes i{font-style:normal;display:grid;place-items:center}.keypad{display:grid;grid-template-columns:repeat(9,1fr);gap:5px;margin:17px 0}.keypad button{height:46px;border:1px solid var(--line);background:var(--soft);color:var(--ink);border-radius:9px;font-size:20px;padding:0}.keypad button small{display:block;font-size:9px;color:var(--muted)}.actions button{font-size:14px;padding:9px 12px}.status{font-size:14px;min-height:48px;margin:15px 0 0;color:var(--muted)}.stats{display:flex;justify-content:space-between;gap:10px;margin:0 0 15px;font-size:13px;color:var(--muted)}.city-title{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:18px}.city-title h2{font-size:23px;margin:0}.pill{font-size:13px;border-radius:20px;background:var(--soft);padding:8px 12px;white-space:nowrap}.district-map{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px;aspect-ratio:1;background:#99b8bd;padding:8px;border-radius:18px;overflow:hidden;box-shadow:inset 0 0 40px #32546822}.district{position:relative;border:2px solid transparent;background:linear-gradient(135deg,#c8dcdc,#e0e9e5);border-radius:10px;overflow:hidden;min-width:0;display:grid;place-items:center;color:#3f666c;padding:0;isolation:isolate}.district.active{border-color:#f8bb4e;box-shadow:0 0 0 2px #f8bb4e}.district-art{position:absolute;inset:0;background-image:var(--atlas);background-size:300% 300%;background-position:var(--pos);opacity:0;transform:translateY(20%) scale(.83);transition:opacity .6s,transform .85s cubic-bezier(.2,.8,.2,1);z-index:-1}.district.built .district-art{opacity:1;transform:none}.district-label{font-size:12px;font-weight:650;text-align:center;padding:8px}.district-label b{display:block;font-size:26px;margin-bottom:7px;opacity:.45}.district.built .district-label{align-self:end;background:#153943d9;color:white;width:100%;font-size:10px;padding:5px}.district.built .district-label b{display:none}.district.new{animation:buildglow 1.1s ease}@keyframes buildglow{50%{box-shadow:inset 0 0 0 4px #ffd482}}.city-meter{height:6px;background:var(--line);border-radius:10px;overflow:hidden;margin:18px 0}.city-meter span{display:block;height:100%;background:var(--accent);transition:width .5s}.city-caption{font-size:14px;margin-bottom:0}.victory{background:var(--soft);padding:20px;border-radius:16px;margin-top:20px}.victory h2{margin:0 0 10px}.rules-pane h2{margin-top:0}.rules-pane li{font-size:15px;line-height:1.7;margin:12px 0}.rules-pane details{margin-top:20px}.muted{font-size:13px;color:var(--muted)}.pause-cover{position:absolute;inset:0;background:var(--panel);display:grid;place-items:center;text-align:center;z-index:5;border-radius:14px}.board-wrap{position:relative}.themes{margin-top:25px}.footer{padding:25px;text-align:center;font-size:14px;color:var(--muted)}.loading{text-align:center;padding:80px 20px}.error-panel{border:1px solid #be3040;padding:24px;border-radius:18px}@media(max-width:950px){.worlds{grid-template-columns:repeat(2,1fr)}.levels{grid-template-columns:repeat(3,1fr)}.play-layout{grid-template-columns:minmax(300px,1fr) minmax(300px,1fr);gap:16px}.puzzle-pane,.city-pane{padding:16px}.nh-links{gap:15px}.nh-nav{gap:16px}.cell{font-size:22px}}@media(max-width:740px){.nh-nav{padding:0 16px;justify-content:space-between}.nh-header{height:64px}.nh-brand{font-size:16px}.menu-toggle{display:block}.nh-links{display:none;position:absolute;left:0;right:0;top:64px;background:var(--panel);padding:20px;border-bottom:1px solid var(--line);margin:0;flex-direction:column;align-items:stretch}.nh-links.open{display:flex}.nh-links a{padding:12px}main#sudoku-app{padding:26px 14px 50px}.intro-row{display:block}.collection-hero{grid-template-columns:1fr;padding:22px;gap:20px}.collection-hero img{aspect-ratio:1.7}.levels{grid-template-columns:repeat(2,1fr);gap:10px}.level{padding:12px}.mini-sudoku span{font-size:10px}.play-layout,.classic .play-layout{grid-template-columns:1fr}.play-top{align-items:flex-start}.play-top h1{font-size:27px}.city-pane{order:-1}.district-map{aspect-ratio:1;max-height:none}.district-label{font-size:10px;padding:4px}.district-label b{font-size:17px;margin-bottom:3px}.district.built .district-label{font-size:9px}.city-caption{font-size:13px}.city-title{margin-bottom:10px}.city-title h2{font-size:20px}.city-meter{margin:10px 0}.puzzle-pane{padding:16px}.cell{font-size:25px}.classic .rules-pane{order:2}.intro-row h1{font-size:38px}.world-card div{padding:11px}.world-card strong{font-size:15px}.world-card small{font-size:12px}.worlds{gap:10px}.toolbar{margin-top:12px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

[hidden]{display:none!important}

.stats label{display:flex;align-items:center;gap:5px;white-space:nowrap;font-weight:400}.stats input{width:16px;height:16px;min-height:0;margin:0}.nh-nav{width:100%}.district{aspect-ratio:1}.collection-hero img,.world-card img{object-fit:contain;background:#c0d4d5}.collection-hero img{aspect-ratio:1.4}.nh-nav .nh-links .play-link{color:var(--paper)}
@media(max-width:740px){.city-pane{display:grid;grid-template-columns:minmax(0,1fr) 156px;column-gap:12px;position:sticky;top:64px;z-index:8;box-shadow:0 8px 20px #1231}.city-pane .district-map{grid-column:2;grid-row:1 / span 5;width:156px;padding:4px;gap:3px;border-radius:10px}.city-pane .city-title{display:block;margin:0}.city-pane .city-title h2{font-size:19px;margin-bottom:9px}.city-pane .pill{display:inline-block;padding:5px 8px;font-size:12px}.city-pane .district-label b{font-size:15px;margin:0}.city-pane .district-label span{display:none}.city-pane .district.built .district-label{display:none}.city-pane .district-label{padding:0}.city-pane .city-caption{font-size:12px;margin:5px 0}.city-pane .city-meter{margin:10px 0 0}.city-pane details{font-size:12px;margin-top:8px}.city-pane details[open]{grid-column:1 / -1}.city-pane details[open] p{font-size:13px}.city-pane .district{border-radius:5px}.city-pane .district-art{border-radius:3px}}
@media(max-width:740px){.cell{scroll-margin-top:300px}.city-pane:has(details[open]){position:static}}
.friend-link{display:inline-flex;align-items:center;min-height:44px;padding:10px 15px;border-radius:12px;background:var(--accent);color:var(--paper);text-decoration:none;font-size:14px}.cell.same-number:not(.selected):not(.error){background:#dce9ff;box-shadow:inset 0 0 0 2px #8ca9d5}.cell.error:after{content:'!';position:absolute;right:3px;top:1px;font-size:9px;font-weight:800}.answer-setting{display:flex;align-items:center;gap:8px;font-size:14px}.answer-setting input{width:18px;height:18px}.hint-panel{background:var(--soft);border:1px solid var(--line);border-radius:16px;padding:18px;margin-top:16px}.hint-panel h3{margin:0}.hint-panel p{font-size:14px}.keypad button{height:52px}.keypad button small{font-size:10px}.level .muted{font-size:12px;min-height:34px;margin-bottom:0}body[data-theme=midnight] .cell.same-number:not(.selected):not(.error){background:#304663}body[data-theme=contrast] .cell.same-number:not(.selected):not(.error){background:#cedfff}.cell{transition:background .12s,color .12s}.classic .play-top .toolbar{justify-content:flex-end}.classic .play-top h1{min-width:0}
@media(max-width:520px){.classic .play-top{flex-direction:column;align-items:stretch;gap:14px}.classic .play-top .toolbar{justify-content:flex-start}.classic .play-top h1{font-size:29px}.classic .play-top .eyebrow{white-space:normal}.classic .actions{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:5px}.classic .actions button{padding:10px 4px;font-size:12px}}