:root{--arcade-bg:#071820;--arcade-panel:#0e2d37;--arcade-panel-2:#153f49;--arcade-gold:#f3cc5b;--arcade-mint:#54e3d0;--arcade-text:#fffdf4;--arcade-muted:#a8bec1;--arcade-danger:#ff806f}
*{box-sizing:border-box}html{min-width:320px;background:var(--arcade-bg)}body.arcade-page{min-height:100vh;margin:0;background:radial-gradient(circle at 15% -10%,#23606188,transparent 32rem),radial-gradient(circle at 90% 15%,#705d2444,transparent 28rem),linear-gradient(145deg,#09242d,#071820 70%);color:var(--arcade-text);font:16px/1.5 Inter,ui-sans-serif,system-ui,sans-serif}
button,input,select{font:inherit}.arcade-shell{width:min(1120px,calc(100% - 28px));margin:auto;padding:18px 0 56px}.arcade-header{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:8px 10px;border:1px solid #ffffff18;border-radius:18px;background:#123641cc;backdrop-filter:blur(15px)}.arcade-header-actions{display:flex;align-items:center;gap:8px}.arcade-link,.arcade-auth{min-height:40px;padding:0 14px;border:1px solid #ffffff20;border-radius:999px;background:#ffffff09;color:var(--arcade-text);font-weight:750;text-decoration:none;display:inline-flex;align-items:center}.arcade-auth{border-color:#f3cc5b55;color:#f5d770}.arcade-title{margin:28px 0 18px}.arcade-title span{color:var(--arcade-gold);font-size:.72rem;font-weight:900;letter-spacing:.18em}.arcade-title h1{margin:5px 0;color:#fffdf4;font:400 clamp(2.3rem,7vw,4.6rem)/.95 Georgia,serif}.arcade-title p{max-width:760px;margin:12px 0 0;color:var(--arcade-muted)}
.arcade-panel{padding:clamp(16px,3vw,28px);border:1px solid #54e3d02d;border-radius:24px;background:linear-gradient(145deg,#123842ee,#0a252dee);box-shadow:0 24px 70px #0007}.arcade-toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:9px;margin-bottom:16px}.arcade-toolbar button,.arcade-toolbar select,.arcade-toolbar input,.arcade-primary,.arcade-secondary{min-height:42px;padding:0 14px;border:1px solid #ffffff1f;border-radius:11px;background:#061c23;color:var(--arcade-text);font-weight:750}.arcade-toolbar button[aria-pressed="true"],.arcade-primary{border-color:transparent;background:var(--arcade-gold);color:#082029}.arcade-secondary{background:#ffffff09}.arcade-status{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;margin:10px 0;color:var(--arcade-muted)}.arcade-status strong{color:var(--arcade-gold)}.arcade-game-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(240px,320px);gap:22px;align-items:start}.arcade-side{display:grid;gap:12px}.arcade-card{padding:16px;border:1px solid #ffffff14;border-radius:16px;background:#ffffff06}.arcade-card h2,.arcade-card h3{margin:0 0 8px;font:400 1.25rem Georgia,serif}.arcade-card p,.arcade-card li{color:var(--arcade-muted);font-size:.88rem}.arcade-card ol,.arcade-card ul{margin:8px 0;padding-left:20px}.arcade-message{min-height:24px;color:#f8d96f}.arcade-score-list{display:grid;gap:6px}.arcade-score-row{display:grid;grid-template-columns:34px 1fr auto;gap:10px;padding:8px;border-radius:9px;background:#ffffff07}.arcade-score-row.is-you{outline:1px solid var(--arcade-gold);color:#f8da70}.arcade-modal{width:min(560px,calc(100% - 24px));border:1px solid #54e3d044;border-radius:22px;background:#0c2932;color:var(--arcade-text);box-shadow:0 30px 100px #000c}.arcade-modal::backdrop{background:#001015cc;backdrop-filter:blur(5px)}.arcade-modal-close{float:right;width:38px;height:38px;border:0;border-radius:50%;background:#ffffff10;color:white;font-size:1.3rem}.arcade-mobile-note{display:none}
/* Killer Sudoku */
.killer-board{width:min(100%,620px);aspect-ratio:1;display:grid;grid-template-columns:repeat(9,1fr);overflow:hidden;border:4px solid #d7b84f;border-radius:15px;background:#e8eee9;box-shadow:0 18px 45px #0007,inset 0 0 0 2px #102f38}
.killer-cell{position:relative;display:grid;place-items:center;min-width:0;padding:0;border:1px solid #728a89;background:#eff4ef;color:#12313a;font:600 clamp(1rem,3.1vw,2rem)/1 Georgia,serif;cursor:pointer}.killer-cell:nth-child(3n){border-right:3px solid #173b42}.killer-cell:nth-child(9n){border-right:0}.killer-cell:nth-child(n+19):nth-child(-n+27),.killer-cell:nth-child(n+46):nth-child(-n+54){border-bottom:3px solid #173b42}.killer-cell.given{background:#d5e4dc;color:#09242d;font-weight:800}.killer-cell.selected{z-index:2;background:#fff2b7;box-shadow:inset 0 0 0 3px #d5a91e}.killer-cell.cage-top{border-top:2px dotted #b36838}.killer-cell.cage-right{border-right-color:#b36838;border-right-style:dotted}.killer-cell.cage-bottom{border-bottom-color:#b36838;border-bottom-style:dotted}.killer-cell.cage-left{border-left:2px dotted #b36838}.killer-cell>span{position:absolute;top:2px;left:4px;font:800 clamp(.48rem,1.3vw,.68rem)/1 Inter,sans-serif;color:#8b3f22}.killer-pad{width:min(100%,620px);display:grid;grid-template-columns:repeat(10,1fr);gap:6px;margin-top:12px}.killer-pad button{min-height:48px;border:1px solid #54e3d044;border-radius:10px;background:#123a44;color:#fffdf4;font-weight:900}.killer-pad button:last-child{font-size:.68rem;color:#f7d96f}

.killer-board.paused{filter:blur(12px) brightness(.55);pointer-events:none}.killer-cell>.killer-notes{inset:12%;display:grid;grid-template-columns:repeat(3,1fr);align-items:center;justify-items:center;color:#5b7474;font:650 clamp(.38rem,1.05vw,.62rem)/1 Inter,sans-serif}.killer-notes i{font:inherit;font-style:normal}.killer-cell>.killer-cage-sum{top:2px;left:4px;color:#8b3f22}

/* Tic-tac-toe */
.ttt-board{width:min(100%,520px);aspect-ratio:1;display:grid;grid-template-columns:repeat(3,1fr);gap:9px;padding:9px;border:1px solid #f3cc5b55;border-radius:28px;background:#061b22;box-shadow:0 20px 45px #0008}.ttt-cell{border:1px solid #54e3d03d;border-radius:19px;background:linear-gradient(145deg,#19444e,#0c2b34);color:#fff;font:800 clamp(3.2rem,12vw,6.5rem)/1 Georgia,serif;text-shadow:0 5px 25px currentColor;cursor:pointer;transition:transform .16s,background .16s}.ttt-cell:hover{transform:translateY(-2px);background:#205560}.ttt-cell[data-mark="X"]{color:#f7d564}.ttt-cell[data-mark="O"]{color:#64dfd1}.ttt-cell.win{background:#58652e;box-shadow:inset 0 0 0 3px #f3cc5b}.ttt-scoreboard{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.ttt-scoreboard div{padding:10px;text-align:center;border-radius:12px;background:#ffffff07}.ttt-scoreboard strong{display:block;color:#f7d96f;font-size:1.35rem}

/* Chess */
.chess-board{width:min(100%,680px);aspect-ratio:1;display:grid;grid-template-columns:repeat(8,1fr);overflow:hidden;border:5px solid #d2ad4f;border-radius:16px;background:#e8dcc1;box-shadow:0 22px 55px #0009}.chess-square{position:relative;display:grid;place-items:center;padding:0;border:0;color:#10242a;font:400 clamp(1.65rem,6vw,4rem)/1 "Segoe UI Symbol","Apple Symbols",serif;cursor:pointer;text-shadow:0 2px 2px #fff5}.chess-square.light{background:#e9ddc1}.chess-square.dark{background:#658c83}.chess-square.selected{box-shadow:inset 0 0 0 5px #f3cc5b}.chess-square.legal::after{content:"";position:absolute;width:24%;aspect-ratio:1;border-radius:50%;background:#f3cc5bbb;box-shadow:0 0 0 5px #17323a44}.chess-square.capture::after{width:82%;background:transparent;border:5px solid #ffcf54aa}.chess-square .coord{position:absolute;left:3px;bottom:2px;color:#17323a99;font:700 .55rem Inter,sans-serif;text-shadow:none}.chess-moves{max-height:230px;overflow:auto;display:grid;grid-template-columns:36px 1fr 1fr;gap:3px 8px}.chess-moves span{padding:4px 6px;border-radius:6px;background:#ffffff05;color:var(--arcade-muted);font-size:.8rem}.chess-moves .move-no{color:#f3cc5b;text-align:right;background:transparent}.chess-analysis{display:grid;gap:8px}.chess-analysis div{padding:10px;border-left:3px solid #54e3d0;border-radius:7px;background:#ffffff06}.chess-analysis strong{display:block;color:#f5d56b}
.chess-board{border:10px solid #3f2415;background:linear-gradient(90deg,#3a2115,#815334 18%,#4b2b1b 36%,#9a6842 55%,#4a2a1a 74%,#795033);box-shadow:inset 0 0 0 3px #bc8855,inset 0 0 16px #160b06,0 24px 58px #000a}.chess-square.light{background:linear-gradient(135deg,rgba(255,255,255,.16),transparent 42%),repeating-linear-gradient(3deg,#e8cfa8 0 7px,#dfbe91 8px 13px,#efd9b5 14px 22px)}.chess-square.dark{background:linear-gradient(135deg,rgba(255,255,255,.07),transparent 42%),repeating-linear-gradient(3deg,#795039 0 7px,#67412d 8px 13px,#82573e 14px 22px)}.chess-piece{position:relative;z-index:1;display:block;font:400 clamp(1.85rem,6.2vw,4.15rem)/1 "DejaVu Sans","Noto Sans Symbols 2","Segoe UI Symbol",serif;transform:translateY(-1px);filter:drop-shadow(0 4px 2px #1c0c0777)}.chess-piece.piece-white{color:#f4dfbd;-webkit-text-stroke:1.6px #5a321d;text-shadow:0 1px 0 #fff8df,0 3px 2px #44281799}.chess-piece.piece-black{color:#24140d;-webkit-text-stroke:1.45px #e3c293;text-shadow:0 1px 0 #7e583d,0 3px 2px #000c}.chess-square.legal::after{z-index:0}.chess-square .coord{z-index:2}.chess-square.dark .coord{color:#f4ddb4aa}.chess-square.light .coord{color:#4c2e1caa}

/* Jigsaw */
.jigsaw-stage{position:relative;width:min(100%,720px);aspect-ratio:4/3;display:grid;overflow:hidden;border:5px solid #c9a849;border-radius:18px;background:#05171d;box-shadow:0 22px 55px #0009}.jigsaw-piece{min-width:0;padding:0;border:1px solid #f7e3a855;background-image:var(--jigsaw-image);background-repeat:no-repeat;cursor:grab;transition:transform .15s,filter .15s}.jigsaw-piece:hover,.jigsaw-piece.selected{z-index:2;filter:brightness(1.18);box-shadow:inset 0 0 0 4px #f3cc5b}.jigsaw-piece.dragging{opacity:.45;transform:scale(.92)}.jigsaw-preview{width:100%;border-radius:10px;border:1px solid #ffffff1f}.jigsaw-theme-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}.jigsaw-theme-grid button{padding:0;overflow:hidden;border:2px solid transparent;border-radius:9px;background:#061b22}.jigsaw-theme-grid button[aria-pressed="true"]{border-color:#f3cc5b}.jigsaw-theme-grid img{display:block;width:100%;aspect-ratio:4/3;object-fit:cover}
.jigsaw-completion-modal h2{margin:8px 44px 6px 0;color:#fffdf4;font:400 2rem/1.05 Georgia,serif}.jigsaw-completion-copy{margin:0 44px 16px 0;color:var(--arcade-muted);line-height:1.5}.jigsaw-confetti{position:fixed;inset:0;z-index:10000;overflow:hidden;pointer-events:none}.jigsaw-confetti i{position:absolute;top:-8vh;width:9px;height:18px;border-radius:3px;background:var(--confetti-colour);box-shadow:0 0 8px color-mix(in srgb,var(--confetti-colour) 55%,transparent);animation:jigsaw-confetti-fall 2.7s cubic-bezier(.2,.7,.35,1) var(--confetti-delay) forwards}@keyframes jigsaw-confetti-fall{0%{opacity:0;transform:translate3d(0,-8vh,0) rotate(0)}8%{opacity:1}100%{opacity:0;transform:translate3d(var(--confetti-drift),110vh,0) rotate(var(--confetti-spin))}}

/* Chamber IQ Challenge */
.iq-page-intro{max-width:820px}.iq-intro-card{width:min(900px,100%)}
.iq-facts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px;margin-bottom:24px}.iq-facts>div{min-width:0;padding:14px 10px;border:1px solid #54e3d022;border-radius:14px;background:#ffffff07;text-align:center}.iq-facts strong,.iq-facts span{display:block}.iq-facts strong{color:var(--arcade-gold);font:400 clamp(1.7rem,4vw,2.35rem)/1 Georgia,serif}.iq-facts span{margin-top:5px;color:var(--arcade-muted);font-size:.72rem}
.iq-intro-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:18px;align-items:start}.iq-intro-grid h2{margin:0 0 10px;color:var(--arcade-text);font:400 1.55rem/1.15 Georgia,serif}.iq-checklist{display:grid;gap:8px;margin:0;padding-left:22px;color:var(--arcade-muted);font-size:.9rem}.iq-standard-note{padding:17px;border-left:3px solid var(--arcade-gold);border-radius:11px;background:#f3cc5b0e}.iq-standard-note strong{color:var(--arcade-gold)}.iq-standard-note p,.iq-privacy-note{margin:7px 0 0;color:var(--arcade-muted);font-size:.84rem;line-height:1.55}.iq-privacy-note{margin-top:18px;text-align:center}.iq-start-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:12px;margin-top:20px}.iq-start-button{min-width:210px}.iq-last-result{color:var(--arcade-muted);font-size:.78rem}
.iq-test-shell,.iq-results{margin-top:22px}.iq-test-toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:15px 18px;border:1px solid #54e3d030;border-radius:18px 18px 0 0;background:#102f38}.iq-test-toolbar div:first-child{display:grid;gap:2px}.iq-test-toolbar span{color:var(--arcade-muted);font-size:.75rem}.iq-test-toolbar strong{color:var(--arcade-text)}.iq-clock{display:flex;align-items:baseline;gap:5px;color:var(--arcade-gold)}.iq-clock span{color:inherit;font:400 2rem/1 Georgia,serif;font-variant-numeric:tabular-nums}.iq-clock small{color:var(--arcade-muted);font-size:.66rem}.iq-progress{position:relative;height:12px;margin-bottom:20px;overflow:hidden;background:#06171d}.iq-progress span,.iq-progress i{position:absolute;left:0;display:block;height:5px;transition:width .25s ease}.iq-progress span{top:0;background:#54e3d077}.iq-progress i{bottom:0;background:linear-gradient(90deg,var(--arcade-mint),var(--arcade-gold));opacity:.9}
.iq-play-grid{grid-template-columns:minmax(0,1fr) 300px}.iq-question-tile{display:flex;min-height:540px;flex-direction:column}.iq-question-meta{display:flex;justify-content:space-between;gap:10px;color:var(--arcade-muted);font-size:.72rem}.iq-domain-pill{display:inline-flex;min-height:26px;align-items:center;padding:0 10px;border:1px solid #54e3d055;border-radius:999px;color:var(--arcade-mint);font-weight:900;letter-spacing:.13em}.iq-prompt{max-width:680px;margin:42px auto 22px;color:var(--arcade-text);text-align:center;font:400 clamp(1.45rem,3vw,2.15rem)/1.22 Georgia,serif}.iq-stimulus{display:grid;min-height:120px;place-items:center;margin-bottom:22px}.iq-number-sequence{color:var(--arcade-gold);font:600 clamp(1.45rem,4vw,2.6rem)/1.2 Georgia,serif;letter-spacing:.08em}.iq-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:auto}.iq-options button{display:flex;min-height:68px;align-items:center;gap:12px;padding:10px 13px;border:1px solid #54e3d035;border-radius:13px;background:linear-gradient(145deg,#163f49,#0c2a33);color:var(--arcade-text);text-align:left;cursor:pointer;transition:border-color .16s,transform .16s,background .16s}.iq-options button:hover,.iq-options button:focus-visible{transform:translateY(-2px);border-color:var(--arcade-gold);outline:0}.iq-options button.is-selected{border-color:var(--arcade-gold);background:#5f5226}.iq-options button:disabled{cursor:default;opacity:.76;transform:none}.iq-option-letter{display:grid;width:32px;aspect-ratio:1;flex:none;place-items:center;border-radius:50%;background:#ffffff10;color:var(--arcade-gold);font-size:.75rem;font-weight:900}.iq-options button>strong{font-size:.92rem}.iq-message{margin:12px 0 0;text-align:center}
.iq-memory-stage{display:grid;min-height:310px;place-items:center;align-content:center;gap:12px;text-align:center}.iq-memory-stage span{color:var(--arcade-gold);font-size:.72rem;font-weight:900;letter-spacing:.2em}.iq-memory-stage strong{font:600 clamp(2.2rem,7vw,4.8rem)/1 Georgia,serif;letter-spacing:.14em}.iq-memory-stage small{color:var(--arcade-muted)}
.iq-visual-sequence{display:flex;max-width:100%;align-items:center;justify-content:center;gap:8px}.iq-visual-sequence>span{color:var(--arcade-muted);font-size:1.7rem}.iq-mini-grid{display:grid;width:58px;aspect-ratio:1;grid-template-columns:repeat(3,1fr);gap:2px;padding:3px;border:1px solid #54e3d055;border-radius:7px;background:#061b22}.iq-mini-grid i{border-radius:2px;background:#ffffff10}.iq-mini-grid i.is-marker{background:var(--arcade-gold);box-shadow:0 0 10px #f3cc5b77}.iq-options .iq-mini-grid{width:48px;margin:auto}.iq-unknown-tile{display:grid;width:58px;aspect-ratio:1;place-items:center;border:1px dashed #f3cc5b77;border-radius:8px;color:var(--arcade-gold);font:400 2rem Georgia,serif}.iq-processing-grid{display:grid;width:min(100%,560px);grid-template-columns:repeat(8,minmax(0,1fr));gap:5px;padding:10px;border:1px solid #54e3d03a;border-radius:15px;background:#061b22}.iq-processing-grid span{display:grid;min-height:38px;place-items:center;border-radius:6px;background:#ffffff08;color:#f5eac7;font-size:1.2rem}
.iq-domain-map{display:grid;gap:12px}.iq-domain-map>div{display:grid;gap:5px}.iq-domain-map span{color:var(--arcade-muted);font-size:.74rem}.iq-domain-map strong{display:flex;gap:5px}.iq-domain-map i{width:10px;aspect-ratio:1;border-radius:50%;background:#ffffff12}.iq-domain-map i.is-complete{background:var(--arcade-mint);box-shadow:0 0 7px #54e3d066}.iq-details-tile h3{margin:0 0 6px;color:var(--arcade-text);font:400 1.05rem Georgia,serif}.iq-details-tile p{margin:0;color:var(--arcade-muted);font-size:.82rem;line-height:1.55}
.iq-results>.arcade-setup-tile{width:min(920px,100%);margin:auto}.iq-result-hero{display:flex;align-items:center;justify-content:center;gap:25px;padding:10px 0 26px;text-align:left}.iq-index-seal{display:grid;width:172px;aspect-ratio:1;flex:none;place-items:center;align-content:center;padding:20px;border:2px solid var(--arcade-gold);border-radius:50%;background:radial-gradient(circle,#6b5a2440,#071c23 68%);box-shadow:inset 0 0 28px #f3cc5b12,0 0 45px #f3cc5b20;text-align:center}.iq-index-seal strong{color:var(--arcade-gold);font:400 3.2rem/.92 Georgia,serif}.iq-index-seal span{display:grid;gap:1px;width:100%;margin-top:8px;color:var(--arcade-muted);font-size:.7rem;font-weight:700;line-height:1.12;text-transform:uppercase;letter-spacing:.13em}.iq-index-seal span em{display:block;font-style:normal}.iq-result-hero h2{margin:5px 0;color:var(--arcade-text);font:400 clamp(1.8rem,4vw,2.8rem)/1 Georgia,serif}.iq-result-hero p{max-width:520px;margin:10px 0 0;color:var(--arcade-muted)}.iq-result-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.iq-domain-results{display:grid;gap:11px}.iq-domain-results>div>div{display:flex;justify-content:space-between;gap:10px;color:var(--arcade-muted);font-size:.78rem}.iq-domain-results strong{color:var(--arcade-gold)}.iq-domain-results i{display:block;height:7px;margin-top:5px;overflow:hidden;border-radius:99px;background:#ffffff12}.iq-domain-results b{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--arcade-mint),var(--arcade-gold))}.iq-result-notes p{margin:8px 0}.iq-result-actions{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:10px;margin-top:20px}.iq-result-actions .arcade-link{min-height:42px}
.iq-mistakes-panel{margin-top:20px;text-align:left}.iq-mistakes-heading{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:14px}.iq-mistakes-heading h3{margin:4px 0 0}.iq-mistakes-heading>strong{color:var(--arcade-gold);white-space:nowrap}.iq-mistakes-list{display:grid;gap:12px}.iq-mistake-item{padding:16px;border:1px solid #8be7d92b;border-radius:15px;background:#061b2294}.iq-mistake-meta{display:block;color:var(--arcade-gold);font-size:.7rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase}.iq-mistake-item h4{margin:6px 0 8px;color:var(--arcade-text);font-size:1rem}.iq-mistake-stimulus{margin:7px 0;color:var(--arcade-muted);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.78rem}.iq-mistake-answers{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:10px}.iq-mistake-answers p{display:grid;gap:3px;margin:0;padding:10px;border-radius:10px;background:#ffffff08}.iq-mistake-answers span{color:var(--arcade-muted);font-size:.68rem;text-transform:uppercase;letter-spacing:.05em}.iq-mistake-answers strong{color:var(--arcade-text)}.iq-mistake-answers p:first-child strong{color:#ffb4a9}.iq-mistake-answers p:last-child strong{color:var(--arcade-mint)}.iq-mistake-logic{margin:11px 0 0;color:var(--arcade-muted);line-height:1.55}.iq-mistake-logic strong{color:var(--arcade-gold)}
.iq-exit-dialog{max-width:430px;padding:30px;text-align:center}.iq-exit-dialog[open]{animation:iq-dialog-in .18s ease-out}.iq-exit-emblem{display:grid;width:46px;aspect-ratio:1;place-items:center;margin:0 auto 13px;border:1px solid #f3cc5b66;border-radius:50%;background:#f3cc5b12;color:var(--arcade-gold);font-size:1.15rem}.iq-exit-dialog h2{margin:8px 0;color:var(--arcade-text);font:400 1.9rem/1.1 Georgia,serif}.iq-exit-dialog p{margin:10px auto 22px;color:var(--arcade-muted);line-height:1.55}.iq-exit-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}.iq-exit-actions button{min-height:48px;cursor:pointer}@keyframes iq-dialog-in{from{opacity:0;transform:translateY(8px) scale(.98)}to{opacity:1;transform:none}}
@media(max-width:600px){.iq-mistake-answers{grid-template-columns:1fr}.iq-mistakes-heading{align-items:start}}
@media(max-width:440px){.iq-exit-dialog{padding:24px 18px}.iq-exit-actions{grid-template-columns:1fr}.iq-exit-actions .arcade-primary{order:-1}}

/* Chamber Crossword */
.crossword-layout{grid-template-columns:minmax(0,1fr) minmax(270px,350px)}.crossword-board{--crossword-cols:11;--crossword-rows:11;width:min(100%,680px);aspect-ratio:var(--crossword-cols)/var(--crossword-rows);display:grid;grid-template-columns:repeat(var(--crossword-cols),minmax(0,1fr));grid-template-rows:repeat(var(--crossword-rows),minmax(0,1fr));gap:2px;padding:7px;border:3px solid #d9b958;border-radius:16px;background:#071a20;box-shadow:0 20px 48px #0008}.crossword-block{background:#06161b;border-radius:2px}.crossword-cell{position:relative;display:block;min-width:0;min-height:0;background:#f7f3e7;border-radius:3px}.crossword-cell small{position:absolute;z-index:2;top:2px;left:3px;color:#365159;font:750 clamp(.45rem,1vw,.62rem)/1 Inter,sans-serif;pointer-events:none}.crossword-cell input{width:100%;height:100%;min-width:0;padding:9px 1px 1px;border:0;border-radius:3px;outline:0;background:transparent;color:#102e36;text-align:center;text-transform:uppercase;font:800 clamp(.9rem,3.3vw,1.8rem)/1 Georgia,serif}.crossword-cell input:focus{background:#fff0a8;box-shadow:inset 0 0 0 3px #d6aa25}.crossword-cell input.correct{background:#d9f0d5}.crossword-cell input.wrong{background:#ffd8d1;color:#a52c21}.crossword-clues ol{margin:0 0 18px;padding-left:28px}.crossword-clues li{margin:0 0 8px;padding-left:4px;line-height:1.35}.crossword-catalog-icon{display:grid!important;grid-template-columns:repeat(3,1fr);padding:5px;background:#082129!important}.crossword-catalog-icon i{display:grid;place-items:center;aspect-ratio:1;border:1px solid #f4e9cd;background:#f7f3e7;color:#17343c;font:800 .48rem Inter,sans-serif}
@media(max-width:760px){.arcade-game-grid{grid-template-columns:1fr}.arcade-title{margin-top:20px}.arcade-header .brand small{display:none}.arcade-link{padding:0 10px}.arcade-mobile-note{display:block}.arcade-panel{border-radius:18px}}
@media(max-width:520px){.arcade-shell{width:min(100% - 16px,1120px)}.arcade-header{gap:7px}.arcade-header-actions{gap:5px}.arcade-link,.arcade-auth{min-height:36px;padding:0 9px;font-size:.73rem}.arcade-title h1{font-size:2.55rem}.killer-pad{grid-template-columns:repeat(5,1fr)}.killer-pad button{min-height:42px}.chess-board{border-width:3px}.chess-square{font-size:clamp(1.6rem,10vw,3rem)}.ttt-board{border-radius:18px}.ttt-cell{border-radius:12px}}

/* Unified Chamber game surfaces */
.compact-title{margin-block:22px 16px}.compact-title h1{font-size:clamp(2.15rem,5vw,3.75rem)}
.chamber-game-grid{grid-template-columns:minmax(0,1fr) 320px;align-items:start}
.arcade-board-tile,.arcade-details-tile,.arcade-setup-tile{border:1px solid #54e3d02d;border-radius:24px;background:linear-gradient(145deg,#123842ee,#0a252dee);box-shadow:0 24px 70px #0007}
.arcade-board-tile{min-width:0;padding:clamp(14px,2vw,22px)}
.arcade-details-tile{display:grid;gap:12px;padding:18px}
.arcade-setup-tile{padding:clamp(16px,3vw,26px)}
.arcade-mode-tabs{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-bottom:18px;padding:5px;border-radius:14px;background:#061b22}
.arcade-mode-tabs button{min-height:44px;border:0;border-radius:10px;background:transparent;color:var(--arcade-muted);font-weight:800}
.arcade-mode-tabs button[aria-pressed="true"]{background:var(--arcade-gold);color:#09232a}
.arcade-setup-row{display:flex;flex-wrap:wrap;align-items:end;gap:10px}.arcade-setup-row label{display:grid;min-width:135px;gap:6px;color:var(--arcade-muted);font-size:.78rem;font-weight:750}.arcade-setup-row input,.arcade-setup-row select{min-height:44px;padding:0 12px;border:1px solid #ffffff20;border-radius:11px;background:#061c23;color:var(--arcade-text)}.arcade-or{align-self:center;color:#819b9d;font-size:.75rem}
.arcade-card-heading{display:flex;align-items:center;justify-content:space-between;gap:8px}.mini-button{min-height:34px;padding:0 10px;border:1px solid #f3cc5b55;border-radius:999px;background:#f3cc5b14;color:#f6d66d;font-weight:800}.full-control{width:100%}.arcade-control-row{display:grid;grid-template-columns:repeat(3,1fr);gap:7px}.arcade-control-row button{min-height:42px;padding:0 8px}.profile-home-link{display:inline-flex;min-height:44px;align-items:center;justify-content:center;margin-top:18px;text-decoration:none}.chamber-profile-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px}.chamber-profile-grid>div{padding:13px;border-radius:12px;background:#ffffff07}.chamber-profile-grid span,.chamber-profile-grid strong{display:block}.chamber-profile-grid span{color:var(--arcade-muted);font-size:.76rem}.chamber-profile-grid strong{margin-top:4px;color:var(--arcade-gold)}
.arcade-difficulty{margin-left:auto}.arcade-difficulty .level-buttons{display:flex}.arcade-difficulty button{min-height:36px;padding:0 10px;border:0;border-radius:999px;background:transparent;color:var(--arcade-muted);font-weight:750}.arcade-difficulty button[aria-pressed="true"]{background:var(--arcade-gold);color:#082029}

/* Fixed game boards: controls and score content never squeeze their cells. */
.ttt-board{width:min(520px,100%);height:auto;grid-template-rows:repeat(3,minmax(0,1fr));flex:none}.ttt-cell{min-width:0;min-height:0;aspect-ratio:auto}
.chess-board{width:min(680px,100%);height:auto;grid-template-rows:repeat(8,minmax(0,1fr));flex:none}.chess-square{min-width:0;min-height:0;aspect-ratio:auto}
.chess-players{display:grid;gap:6px;margin-bottom:10px}.chess-players>div{display:flex;justify-content:space-between;gap:8px;padding:8px 10px;border-radius:9px;background:#ffffff07}.chess-players strong{color:var(--arcade-gold);font-size:.78rem}

/* Killer Sudoku: strong 3×3 structure with independent, unambiguous cage outlines. */
.killer-board{width:min(680px,100%);height:auto;grid-template-rows:repeat(9,minmax(0,1fr));border-color:#f3cc5b;border-radius:9px;background:#edf3ef}
.killer-cell{min-width:0;min-height:0;aspect-ratio:auto;border:1px solid #aab9b8;background:#f7faf7;font-weight:600;overflow:visible}
.killer-cell.given{background:#dce9e3;font-weight:700}.killer-cell.matching{background:#c9eee5;color:#082b33;box-shadow:inset 0 0 0 2px #49bfae}.killer-cell.selected{background:#fff0aa;box-shadow:inset 0 0 0 3px #d5a91e}.killer-cell.cage-top,.killer-cell.cage-right,.killer-cell.cage-bottom,.killer-cell.cage-left{border-style:solid;border-color:#aab9b8}
.killer-cell::after{content:"";position:absolute;z-index:1;inset:3px;pointer-events:none;border:0 dotted #4d5660}
.killer-cell.cage-top::after{border-top-width:2px}.killer-cell.cage-right::after{border-right-width:2px}.killer-cell.cage-bottom::after{border-bottom-width:2px}.killer-cell.cage-left::after{border-left-width:2px}
.killer-cell>.killer-cage-sum{z-index:2;top:5px;left:7px;padding:0 2px;background:#f7faf7;color:#28343b;font-size:clamp(.48rem,1vw,.68rem)}.killer-cell.given>.killer-cage-sum{background:#dce9e3}
.killer-controls.control-panel{box-sizing:border-box;min-width:0;max-width:100%;margin-top:0;padding:18px;overflow:hidden}.killer-number-pad{display:grid!important;width:100%;min-width:0;max-width:100%;grid-template-columns:repeat(3,minmax(0,1fr))!important;gap:8px;margin:0}.killer-number-pad button{width:100%;min-width:0;min-height:46px;aspect-ratio:auto;padding:0;font-size:1rem}.killer-number-pad button:last-child{grid-column:1/-1;min-height:42px}.killer-tool-grid{grid-template-columns:1fr 1fr}.killer-tool-grid button{min-height:64px}.killer-rule-card{margin-top:2px}
.killer-player-name{margin:14px 0 10px;padding:14px;border:1px solid #54e3d033;border-radius:13px;background:linear-gradient(135deg,#54e3d012,#ffffff08)}.killer-player-name span,.killer-player-name strong{display:block}.killer-player-name span{color:var(--arcade-muted);font-size:.72rem}.killer-player-name strong{margin-top:4px;color:var(--arcade-text);font-size:1.08rem}.profile-code-card{grid-column:1/-1}.killer-league-note{color:var(--arcade-muted);font-size:.8rem;line-height:1.55}

@media(max-width:860px){.arcade-header{flex-wrap:wrap}.arcade-difficulty{order:3;width:100%;margin:0}.arcade-difficulty .level-buttons{overflow-x:auto}.chamber-game-grid,.crossword-layout,.iq-play-grid{grid-template-columns:1fr}.arcade-details-tile{grid-template-columns:1fr}.iq-details-tile{grid-template-columns:1fr 1fr}.iq-details-tile .full-control{grid-column:1/-1}}
@media(max-width:560px){.arcade-board-tile,.arcade-details-tile,.arcade-setup-tile{border-radius:18px}.arcade-setup-row{display:grid;grid-template-columns:1fr}.arcade-setup-row>*{width:100%}.arcade-or{text-align:center}.chamber-profile-grid{grid-template-columns:1fr}.arcade-control-row{grid-template-columns:1fr}.killer-cell>.killer-cage-sum{top:3px;left:3px}.killer-cell::after{inset:2px}.killer-controls.control-panel{padding:14px}.killer-number-pad{grid-template-columns:repeat(3,minmax(0,1fr))!important}.iq-facts{grid-template-columns:1fr 1fr}.iq-intro-grid,.iq-result-grid{grid-template-columns:1fr}.iq-test-toolbar{padding:12px}.iq-question-tile{min-height:500px}.iq-prompt{margin-top:28px}.iq-options{grid-template-columns:1fr}.iq-processing-grid{grid-template-columns:repeat(6,minmax(0,1fr));gap:3px;padding:6px}.iq-processing-grid span{min-height:34px}.iq-visual-sequence{gap:3px}.iq-mini-grid,.iq-unknown-tile{width:44px}.iq-visual-sequence>span{font-size:1.15rem}.iq-details-tile{grid-template-columns:1fr}.iq-result-hero{display:grid;justify-items:center;text-align:center}.iq-index-seal{width:154px;padding:18px}.iq-index-seal strong{font-size:2.85rem}.iq-index-seal span{font-size:.64rem;letter-spacing:.11em}}

/* Version 36: unmistakable tournament pieces and a miniature crossword tile. */
.chess-board{border:10px solid #412817;background:#6d472e url('/icons/chess-wood-texture-v2.webp') center/cover;box-shadow:inset 0 0 0 2px #d4ae65,inset 0 0 18px #150a05,0 24px 58px #000a}
.chess-square{box-shadow:inset 0 0 0 1px #2a160a22}
.chess-square.light{background:linear-gradient(135deg,#fff8e43d,transparent 45%),rgba(236,211,169,.86)}
.chess-square.dark{background:linear-gradient(135deg,#fff6dc14,transparent 45%),rgba(83,48,29,.84)}
.chess-piece.piece-white{color:#fffdf7;-webkit-text-stroke:1px #d6aa43;text-shadow:0 1px 0 #fff,0 2px 2px #2b180dcc,0 0 5px #26150a66}
.chess-piece.piece-black{color:#080909;-webkit-text-stroke:1px #d6aa43;text-shadow:0 1px 0 #5b3d25,0 2px 2px #000,0 0 5px #f0d18844}
@media(max-width:520px){.chess-board{border-width:5px}}
.crossword-catalog-icon{display:grid!important;grid-template-columns:repeat(5,1fr);grid-template-rows:repeat(5,1fr);gap:1px;padding:6px;background:#d7b957!important}
.crossword-catalog-icon i{display:grid;place-items:center;min-width:0;min-height:0;border:0;background:#f7f3e7;color:#17343c;font:800 .45rem/1 Inter,sans-serif}
.crossword-catalog-icon i.block{background:#09232b}
.crossword-catalog-icon{display:grid!important;place-items:center;padding:4px;background:linear-gradient(145deg,#173f48,#071c24)!important}
.crossword-catalog-icon svg{display:block;width:100%;height:100%;border-radius:10px;background:transparent}
.crossword-clues li{margin-bottom:5px;padding-left:2px}
.crossword-clues li button{width:100%;padding:5px 7px;border:0;border-radius:7px;background:transparent;color:var(--arcade-muted);text-align:left;cursor:pointer}
.crossword-clues li button:hover,.crossword-clues li button.active-clue{background:#f3cc5b18;color:#f8d96f}
.crossword-cell.active-word{background:#e6f5ec}
.crossword-cell.active-word:has(input:focus){background:#fff0a8}

/* Keep the chess board stationary while the Chamber Keeper status text changes. */
#chess-message{min-height:3.2em;margin-block:10px 0;contain:layout}

/* Chamber-themed choice controls replace the phone's white native picker. */
select[data-chamber-select-ready]{position:absolute!important;width:1px!important;height:1px!important;opacity:0!important;pointer-events:none!important}
.chamber-select{position:relative;min-width:180px;color:var(--arcade-text,#fffdf4)}
.chamber-select-trigger{display:flex;width:100%;min-height:46px;align-items:center;justify-content:space-between;gap:14px;padding:0 14px;border:1px solid #54e3d044;border-radius:12px;background:linear-gradient(145deg,#153f49,#09242d);color:inherit;font:750 1rem/1.2 Inter,ui-sans-serif,system-ui,sans-serif;text-align:left;box-shadow:inset 0 1px 0 #ffffff0d;cursor:pointer}
.chamber-select-trigger>i{width:9px;height:9px;flex:none;border-right:2px solid #f3cc5b;border-bottom:2px solid #f3cc5b;transform:rotate(45deg) translateY(-2px);transition:transform .18s}
.chamber-select.is-open .chamber-select-trigger{border-color:#f3cc5b;box-shadow:0 0 0 3px #f3cc5b18}
.chamber-select.is-open .chamber-select-trigger>i{transform:rotate(225deg) translate(-2px,-2px)}
.chamber-select-menu{position:absolute;z-index:1000;top:calc(100% + 7px);left:0;width:max(100%,230px);overflow:hidden;padding:6px;border:1px solid #f3cc5b66;border-radius:15px;background:linear-gradient(155deg,#153f49,#071b22);box-shadow:0 20px 50px #000b,0 0 0 1px #54e3d015}
.chamber-select-menu[hidden]{display:none}
.chamber-select-option{display:flex;width:100%;min-height:48px;align-items:center;justify-content:space-between;gap:12px;padding:8px 11px;border:0;border-bottom:1px solid #ffffff12;background:transparent;color:#fffdf4;font:650 1rem/1.25 Inter,ui-sans-serif,system-ui,sans-serif;text-align:left;cursor:pointer}
.chamber-select-option:last-child{border-bottom:0}.chamber-select-option:hover,.chamber-select-option:focus-visible{outline:0;background:#54e3d012;color:#fff}.chamber-select-option[aria-selected="true"]{background:#f3cc5b16;color:#f8da70}
.chamber-select-option>i{width:18px;height:18px;flex:none;border:2px solid #a8bec1;border-radius:50%}.chamber-select-option[aria-selected="true"]>i{border:5px solid #54e3d0;box-shadow:0 0 0 2px #071820}
.arcade-toolbar>.chamber-select{margin-right:2px}.arcade-setup-row label>.chamber-select,.dots-mode label>.chamber-select,.challenge-friend-choice>.chamber-select{margin-top:6px}
@media(max-width:560px){.chamber-select{width:100%;min-width:0}.chamber-select-menu{position:fixed;z-index:10001;top:auto;right:14px;bottom:18px;left:14px;width:auto;max-height:min(70vh,520px);overflow:auto;padding:8px;border-radius:20px;background:linear-gradient(155deg,#174550,#071b22);box-shadow:0 30px 90px #000e}.chamber-select-option{min-height:55px}.arcade-toolbar>.chamber-select{flex-basis:100%}}