:root{color-scheme:dark;--bg:#eee6d6;--panel:#eee6d6;--line:#fcf7ed;--muted:#79654c;--text:#33291f;--mint:#7b4d2c;--light:#7b4d2c;--dark:#79654c;--selected:#edcc75}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,Helvetica,sans-serif}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer;border:0}button:disabled{cursor:default;opacity:.35}button:focus-visible,a:focus-visible{outline:3px solid var(--selected);outline-offset:3px}button svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.6}button{touch-action:manipulation}[hidden]{display:none!important}.shell{max-width:1190px;padding:0 24px;margin:auto;min-height:100svh;display:flex;flex-direction:column}.header{min-height:78px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:12px}.brand{display:flex;align-items:center;gap:13px}.brand img,.loading img{object-fit:contain}h1{font-size:22px;margin:5px 0 0;letter-spacing:-.8px}h1 span{color:var(--mint)}.eyebrow{font-size:8px;letter-spacing:2px;color:var(--muted);font-weight:700}.header-right{display:flex;align-items:center;gap:22px}.text-button{font-size:11px;background:none;padding:12px 3px;border-bottom:1px solid var(--line)}.engine-state{font-size:9px;color:var(--muted);display:flex;align-items:center;gap:7px}.engine-state:before{content:'';width:5px;height:5px;border-radius:50%;background:#d1b46c}.engine-state[data-state=ready]:before{background:var(--mint)}.engine-state[data-state=error]:before{background:#ec8c7e}.layout{width:100%;display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:48px;align-items:center;margin:auto;padding:20px 0}.play-column{min-width:0;width:min(100%,calc(100svh - 245px));justify-self:center}.board-wrap{width:100%;border-radius:5px;overflow:hidden;box-shadow:0 14px 40px #eee6d622}.board{width:100%;aspect-ratio:1;display:grid;grid-template-columns:repeat(8,1fr);position:relative;touch-action:none;user-select:none;-webkit-user-select:none}.square{padding:0;border-radius:0;position:relative;display:flex;align-items:center;justify-content:center;aspect-ratio:1;min-width:0;background:var(--light);color:#7b4d2c;outline-offset:-4px!important}.square.dark{background:var(--dark);color:#33291f}.square.last:before,.square.selected:before,.square.check:before{position:absolute;content:'';inset:0;background:#ead36c65}.square.selected:before{background:#f7d269b5}.square.check:before{background:radial-gradient(#d74745d9,#d7474500 75%)}.square.legal:after{content:'';position:absolute;width:24%;height:24%;border-radius:50%;background:#fcf7ed42;pointer-events:none}.square.capture:after{width:87%;height:87%;border:5px solid #fcf7ed50;background:none}.square.drag-origin .piece{opacity:.18}.coord{position:absolute;font-size:clamp(8px,1vw,11px);font-weight:700;z-index:2;line-height:1}.coord.file{bottom:4px;right:4px}.coord.rank{left:4px;top:4px}.piece{width:92%;height:92%;position:relative;pointer-events:none;overflow:visible;z-index:1}.piece g{stroke-width:2.5;stroke-linejoin:round;stroke-linecap:round}.piece.white g{fill:#fff9eb;stroke:#70563c}.piece.black g{fill:#30291f;stroke:#bba485}.piece .detail{fill:none;stroke-width:2}.player-strip{min-height:54px;display:flex;align-items:center;gap:10px;padding:5px 0}.avatar{width:32px;height:34px;flex-shrink:0;background:#fcf7ed;border:1px solid var(--line);border-radius:6px}.avatar .piece{width:100%;height:100%}.avatar.you{background:#7b4d2c1c}.player-strip strong{display:block;font-size:12px;font-weight:600}.player-strip small{display:block;font-size:7px;color:var(--muted);letter-spacing:1.3px;margin-top:5px}.turn-chip{margin-left:auto;font-size:7px;letter-spacing:1px;color:var(--muted);border:1px solid var(--line);border-radius:5px;padding:7px;white-space:nowrap}.turn-chip.active{color:var(--mint);border-color:#7b4d2c55;background:#7b4d2c10}.captured{display:flex;align-items:center;margin-left:4px;max-width:35%;flex-wrap:wrap;gap:0}.captured .piece{width:15px;height:21px;margin-left:-3px}.board-tools{display:flex;justify-content:center;gap:28px;padding:5px 0}.board-tools button{background:none;display:flex;align-items:center;gap:7px;color:var(--muted);font-size:10px;min-height:36px}.side-panel{min-width:0;align-self:center}.intro h2{font-family:Georgia,serif;font-weight:400;font-size:44px;line-height:1.04;letter-spacing:-1.8px;margin:16px 0}.intro h2 em{font-style:normal;color:var(--mint)}.intro p{font-size:12px;color:var(--muted);line-height:1.8;margin:0 0 24px}fieldset{padding:0;border:0;margin:0}legend{font-size:8px;letter-spacing:1.4px;font-weight:700;color:var(--muted);margin-bottom:12px}.difficulty{display:grid;grid-template-columns:repeat(3,1fr);gap:7px}.difficulty button{display:grid;gap:8px;text-align:left;background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:12px 10px}.difficulty button span{font-size:10px}.difficulty button strong{font-family:Georgia,serif;font-size:26px;font-weight:400;letter-spacing:-1px}.difficulty button small{font-size:6px;letter-spacing:.5px;color:var(--muted)}.difficulty button[aria-pressed=true],.side-choice button[aria-pressed=true]{border-color:var(--mint);color:var(--mint);background:#7b4d2c0c}.level-note{min-height:32px;font-size:10px;line-height:1.7;color:var(--muted);margin:12px 0 20px}.side-choice{display:flex;gap:7px;margin-bottom:16px}.side-choice button{flex:1;font-size:10px;background:none;border:1px solid var(--line);padding:9px;border-radius:5px}.primary{background:var(--mint);color:#7b4d2c;border-radius:6px;font-size:12px;font-weight:700;min-height:44px;width:100%;display:flex;align-items:center;justify-content:space-between;padding:12px 16px}.primary:hover{background:#33291f}.primary span{font-size:19px;font-weight:400}.rating-note{font-size:8px;line-height:1.7;color:var(--muted);margin:12px 0 0}.resume{background:none;border:1px solid var(--line);padding:12px;width:100%;border-radius:6px;font-size:11px;margin-top:8px;color:var(--mint)}.notation{border-top:1px solid var(--line);margin-top:24px;padding-top:16px}.section-title{display:flex;align-items:center;justify-content:space-between}.section-title h3{font-size:10px;font-weight:600;margin:0}.section-title>span{font-size:7px;color:var(--muted);letter-spacing:1px}.move-scroll{height:100px;overflow:auto;overscroll-behavior:contain;margin-top:12px;scrollbar-width:thin;scrollbar-color:#c5b598 transparent}#moves{padding:0;margin:0;list-style:none;font-size:11px;font-variant-numeric:tabular-nums}#moves li{display:grid;grid-template-columns:30px 1fr 1fr;padding:7px 8px;gap:8px;border-radius:4px}#moves li:nth-child(odd){background:#33291f04}.move-number{color:#79654c}#moves li.empty-moves{display:block;font-size:10px;line-height:1.6;color:var(--muted);background:none;padding:5px 0}.last-move{color:var(--mint)}.play-help{font-size:9px;color:var(--muted);line-height:1.8;margin:13px 0}.record{font-size:8px;line-height:1.7;color:#79654c}.match-status{min-height:150px;padding:15px 0 5px}.status-heading{display:flex;align-items:center;gap:10px}.match-status h2{font-size:25px;letter-spacing:-.7px;font-weight:500;margin:13px 0 8px}.match-status p{font-size:11px;line-height:1.8;color:var(--muted);margin:0 0 16px}.thinking{height:5px;width:5px;background:var(--mint);border-radius:50%;animation:pulse 1s infinite}body[data-playing=true] .intro{display:none}body[data-playing=true] .move-scroll{height:230px}footer{border-top:1px solid var(--line);padding:14px 0;display:flex;justify-content:space-between;color:#79654c;font-size:8px;gap:10px}footer strong{font-weight:400;color:#7b4d2c}footer a{color:inherit;text-decoration:none}dialog{background:var(--panel);color:var(--text);border:1px solid #c5b598;border-radius:12px;width:min(420px,calc(100% - 32px));padding:26px;box-shadow:0 20px 80px #eee6d688}dialog::backdrop{background:#eee6d6bd}dialog h2{font-size:22px;letter-spacing:-.8px;margin:0 0 12px}dialog p{font-size:12px;color:var(--muted);line-height:1.7}#promotion-options{display:flex;gap:8px;margin:20px 0 8px}#promotion-options button{flex:1;background:#7b4d2c0c;border:1px solid var(--line);border-radius:7px;aspect-ratio:1}#promotion-options button:hover{border-color:var(--mint)}.dialog-actions{display:flex;gap:16px;margin-top:24px}.dialog-actions .primary{width:auto;flex:1;justify-content:center}.drag-piece{position:fixed;left:0;top:0;pointer-events:none;z-index:9;will-change:transform}.drag-piece .piece{width:100%;height:100%}.loading{position:fixed;inset:0;z-index:20;background:var(--bg);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px}.loading>span{font-size:11px;letter-spacing:6px;margin-left:6px}.loading small{position:absolute;bottom:35px;font-size:9px;color:var(--muted)}.loading-line{width:70px;height:2px;background:var(--line);overflow:hidden}.loading-line:after{content:'';display:block;width:35px;height:100%;background:var(--mint);animation:load 1s ease-in-out infinite}.no-script{position:fixed;inset:0;background:var(--bg);padding:40px;z-index:30}@keyframes load{0%,100%{transform:translateX(-35px)}50%{transform:translateX(70px)}}@keyframes pulse{50%{opacity:.2}}@media(min-width:781px) and (max-height:720px){.header{min-height:54px}.layout{gap:32px;padding:10px 0}.play-column{width:min(100%,calc(100svh - 210px))}.intro h2{font-size:32px;margin:10px 0}.intro p{margin-bottom:12px}.difficulty button{padding:9px;gap:6px}.level-note{margin:8px 0;min-height:25px}.notation{margin-top:14px;padding-top:12px}.setup~.notation .move-scroll{height:40px}.rating-note{font-size:7px}.player-strip{min-height:45px}.play-help{margin:8px 0}body[data-playing=true] .move-scroll{height:160px}}
@media(max-width:780px){.shell{padding:0 12px}.header{min-height:55px}.brand{gap:9px}.brand img{width:26px;height:32px}.brand .eyebrow{display:none}h1{font-size:18px;margin:0}.header-right{gap:12px}.engine-state{font-size:8px}.text-button{font-size:10px}.layout{grid-template-columns:1fr;gap:9px;padding:5px 0 12px;margin:0}.play-column{width:min(100%,calc(100svh - 200px));max-width:540px}.player-strip{min-height:40px;gap:8px}.avatar{width:26px;height:29px}.player-strip strong{font-size:11px}.player-strip small{font-size:6px;margin-top:3px}.board-tools{gap:28px;padding:0}.board-tools button{min-height:36px;font-size:9px}.side-panel{width:100%;max-width:540px;justify-self:center}.intro{display:none}.setup{padding:10px 5px}.difficulty button{padding:10px;gap:6px}.difficulty button strong{font-size:25px}.difficulty button small{font-size:7px}.difficulty legend{margin-bottom:9px}.level-note{margin:9px 0 13px;min-height:0}.side-choice{margin-bottom:12px}.side-choice legend{margin-bottom:8px}.rating-note{font-size:8px}.notation{margin-top:9px;padding-top:12px}.move-scroll{height:62px}.play-help{margin:8px 0}.record{margin-bottom:8px}.match-status{min-height:0;padding:10px 4px;position:relative}.match-status h2{font-size:19px;margin:7px 0 5px}.match-status p{font-size:10px;margin:0;line-height:1.6}.status-heading .eyebrow{font-size:7px}.match-status #play-again{margin-top:12px}body[data-playing=true] .move-scroll{height:75px}.captured .piece{width:13px;height:17px}footer{font-size:7px;padding:10px 0}footer a{font-size:7px}.board-wrap{border-radius:2px}.board .coord{font-size:8px}.board .coord.file{bottom:3px;right:3px}.board .coord.rank{top:3px;left:3px}}
@media(max-width:420px){.shell{padding-left:max(6px,env(safe-area-inset-left));padding-right:max(6px,env(safe-area-inset-right))}.play-column{width:100%}.engine-state{max-width:85px;line-height:1.4}.header{padding:0 4px}.side-panel{padding:0 5px}footer{padding-left:4px;padding-right:4px}.captured{max-width:30%}}
@media(max-height:500px) and (min-width:640px){.shell{padding:0 12px}.header{min-height:42px}.header .eyebrow{display:none}.brand img{height:28px;width:23px}.layout{grid-template-columns:minmax(0,1fr) 260px;gap:25px}.play-column{width:min(100%,calc(100svh - 145px))}.player-strip{min-height:30px}.avatar{width:22px;height:25px}.board-tools button{min-height:26px;font-size:8px}.board-tools{gap:15px}.intro{display:none}.difficulty button{padding:8px;gap:4px}.difficulty button strong{font-size:22px}.level-note{margin:7px 0;font-size:8px}.side-choice{margin:0 0 8px}.side-choice legend,.difficulty legend{margin-bottom:6px}.side-choice button{padding:7px}.primary{min-height:36px;padding:8px 12px}.rating-note{font-size:7px;margin-top:7px}.notation{margin-top:10px;padding-top:8px}.move-scroll{height:40px}body[data-playing=true] .move-scroll{height:90px}.play-help{display:none}footer{padding:7px 0;font-size:7px}.record{font-size:7px}}
.material-advantage{flex-shrink:0;min-width:18px;font-size:13px;font-weight:700;font-variant-numeric:tabular-nums;color:var(--mint);line-height:1.2}.opponent .material-advantage{color:var(--text)}
@media(max-width:780px){.material-advantage{font-size:12px;min-width:16px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}}

/* chess: independent visual identity, shared studio only. */
:root{color-scheme:light;--bg:#eee6d6;--panel:#fcf7ed;--line:#c5b598;--muted:#79654c;--text:#33291f;--mint:#7b4d2c;--gold:#7b4d2c;--peach:#7b4d2c;--cyan:#7b4d2c;--accent:#7b4d2c;--light:#f4e6c9;--dark:#98734c}
body{background:#eee6d6;color:#33291f;font-family:Georgia, serif}
h1,h2,h3{font-family:Georgia, serif}
button{border-radius:1px}
.overlay,.veil{background:#eee6d6ed;color:#33291f;backdrop-filter:none}
.menu,.menu-card,.card,.panel{color:#33291f}
.primary,.primary-button,.launch{background:#7b4d2c;color:#7b4d2c;border-color:#7b4d2c}
.primary:hover,.primary-button:hover,.launch:hover{background:#7b4d2c;filter:brightness(1.1)}
button[aria-pressed=true]{border-color:#7b4d2c}
.board{box-shadow:0 7px 0 #765137,0 12px 24px #50391b22;border:0;outline:3px solid #765137;outline-offset:-3px}.header{border-bottom:double 3px #b7a07b}h1{font-size:26px}
:root{--light:#eedcbb;--dark:#94704b;color-scheme:light}
:root{--honey:#7b4d2c;--amber:#7b4d2c}
h2 em,h2>span,.chapter-select button strong,.control-button strong{color:#7b4d2c}

:root{--honey:#7b4d2c;--amber:#7b4d2c}
h2 em,h2>span,.chapter-select button strong,.control-button strong{color:#7b4d2c}
.primary,.primary-button,.launch{color:#ffffff!important}