:root{font-family:Arial,Helvetica,sans-serif;color:#20344b;background:#f6f7f9;font-synthesis:none;--blue:#155eac;--red:#d71936}*{box-sizing:border-box}body{margin:0}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer;min-height:44px;min-width:44px}a{color:var(--blue)}button:focus-visible,a:focus-visible{outline:3px solid #0769bc;outline-offset:3px}button:disabled{opacity:.5;cursor:default}header{max-width:1280px;margin:auto;padding:24px 32px;border-bottom:1px solid #dce2e8;display:flex;gap:18px;align-items:center}header>span{font-size:10px;letter-spacing:1px;line-height:1.6}.brand{color:var(--red);font-weight:900;font-size:42px;letter-spacing:-3px;text-decoration:none}.brand sup{font-size:12px;letter-spacing:0}.demo-label{margin-left:auto}main{max-width:1280px;margin:auto;padding:36px 32px}h1{font-size:clamp(30px,4vw,54px);letter-spacing:-1.8px;line-height:1.1;margin:12px 0 20px}h1 em{color:var(--blue);font-style:normal}h2{font-size:24px;letter-spacing:-.5px}h3{font-size:16px}p{line-height:1.65}.lead{font-size:18px;color:#5c6c7b}.eyebrow{font-size:11px;font-weight:bold;letter-spacing:1.7px;color:#596e84}.primary,.quiet{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:9px;padding:13px 18px;min-height:44px;text-decoration:none;line-height:1.3}.primary{background:var(--blue);color:white;border:1px solid var(--blue);font-weight:bold}.quiet{background:white;color:#29455f;border:1px solid #c3ced9}.primary:hover{background:#104c8c}.book-card,.panel{background:white;border:1px solid #dfe5eb;border-radius:16px;padding:26px}.book-card{display:flex;gap:30px;align-items:center;max-width:850px;margin-top:32px}.cover-placeholder{min-width:190px;background:#eff3f7;color:#5f7284;align-self:stretch;padding:28px;display:grid;place-content:center;text-align:center;border-radius:10px}.cover-placeholder>span{font-size:42px;color:var(--red);font-weight:900}.book-card h2{margin-top:8px}.back-link{display:inline-block;min-height:44px}.shop-cta{margin-top:30px;padding:20px 0}.shop-cta p{font-size:13px;color:#5a6d80}footer{max-width:1216px;margin:10px auto;padding:22px 16px;border-top:1px solid #dce2e8;font-size:12px;color:#6b7b8a}

[hidden]{display:none!important}
body:has(#runtime) header{padding-top:12px;padding-bottom:12px}body:has(#runtime) main{padding-top:12px}
.runtime-heading{display:flex;justify-content:space-between;gap:12px;align-items:center}.runtime-heading h1{font-size:clamp(20px,2.5vw,30px);letter-spacing:-.5px;margin:0 0 12px}#timer{font-size:11px;color:#697786;white-space:nowrap;font-variant-numeric:tabular-nums}
.play-instruction{font-size:18px;margin:4px 0 18px}#message{font-size:14px;line-height:1.5}#message:empty{display:none}.workspace{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(330px,1fr);gap:26px;align-items:start}.artwork{min-width:0;text-align:right}#canonical-spread{display:block;width:100%;height:auto;max-height:520px;object-fit:contain;background:white}#zoom{margin-top:8px;font-size:13px;padding:9px 12px}
.case{background:#da1733;border-radius:8px;padding:10px;box-shadow:inset 0 -3px #ab1028}.case-label{color:white;font-size:12px;padding:0 2px 5px}.tray{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:3px;padding:2px}.tile,.slot,.bank-empty{position:relative;height:52px;min-width:0;padding:0;border-radius:4px;border:1px solid #dccda8;background:#fff2d5;color:#cd172d;font-size:26px;box-shadow:inset 0 -2px #e8dab9}.bank-empty,.slot.empty{background:#bd142b;color:white;border-color:#a61327;box-shadow:none}.tile.selected,.slot.selected{outline:3px solid #1664af;outline-offset:-3px}.slot .field-number{position:absolute;left:3px;bottom:1px;font-size:9px;color:#5c5549}.hinge{height:14px;border-bottom:2px solid #b6122c;margin-bottom:8px}.progress-row{display:flex;justify-content:space-between;gap:8px;margin:12px 0;font-size:12px;color:#52677a}.actions{display:flex;gap:10px}.actions button{flex:1}#result{margin-top:22px;padding-top:18px;border-top:1px solid #dce2e8}#result h2{font-size:23px;margin:0 0 6px}#score{font-size:13px;margin:0 0 12px}.pattern-comparison{display:grid;grid-template-columns:1fr 1fr;gap:24px}.pattern-comparison figure{margin:0;min-width:0}.pattern-comparison figcaption{font-size:14px;margin-bottom:10px}.pattern-comparison img{display:block;width:100%;max-width:450px;aspect-ratio:3/1;object-fit:contain;background:#fff}#book-pattern{image-rendering:auto}.result-actions{max-width:520px;margin-top:18px}.compact-cta{font-size:13px;margin-top:22px}.compact-cta p{margin:0;font-size:12px}.shop-link,.control-set-link{display:inline-flex;align-items:center;min-height:44px;text-underline-offset:3px}.compact-cta p .control-set-link{font-size:12px}.dragging{opacity:.5}.slot.drop-target{outline:3px solid #1664af;outline-offset:-3px}dialog{max-width:96vw;width:1100px;max-height:94dvh;overflow:auto;border:0;border-radius:12px;padding:14px;color:#20344b}dialog::backdrop{background:#102338bb}dialog img{display:block;width:100%;height:auto}.close-dialog{display:block;margin-left:auto;margin-bottom:8px}#expired{margin:18px 0}
.book-cover{width:190px;max-height:260px;object-fit:contain}select{font:inherit;min-height:44px;max-width:100%}
@media(max-width:800px){header{padding:12px}.brand{font-size:32px}.demo-label{font-size:8px;max-width:90px}main{padding:16px 12px}.book-card{flex-direction:column;align-items:stretch;padding:18px}.cover-placeholder{min-width:0;min-height:150px}.workspace{display:grid;grid-template-columns:minmax(0,1fr);gap:16px}.runtime-heading{align-items:start}.runtime-heading h1{font-size:20px}.play-instruction{font-size:15px;margin-bottom:12px}.case{padding:6px}.tray{gap:2px;padding:2px}.tile,.slot,.bank-empty{height:46px;min-height:44px;font-size:25px}.case-label{font-size:11px}.progress-row{margin:10px 0}.actions button{padding:10px 12px}#canonical-spread{max-height:none}#result h2{font-size:20px}.pattern-comparison{gap:12px;grid-template-columns:minmax(0,1fr)}.pattern-comparison img{max-width:400px}.pattern-comparison figcaption{margin-bottom:6px}.compact-cta{margin-top:18px}#timer{font-size:10px}.back-link{font-size:13px}.book-cover{max-width:100%}dialog{padding:8px}dialog img{min-width:700px}.close-dialog{position:sticky;right:0;top:0}footer{margin-top:0}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

/* R11: close the upper lid, turn the closed box upward around the hinge,
   then open its other half downward. Keep the outer rotation at -180deg. */
.case-stage{perspective:1200px}.case{position:relative;transform-style:preserve-3d;transition:transform .75s ease;background:transparent;box-shadow:none;padding:0;transform-origin:center 50%}
.case-lid,.case-board{position:relative;background:#da1733;padding:8px;transform-style:preserve-3d;transition:transform .7s ease;min-height:126px}
.case-lid{transform-origin:center calc(100% + 2px);border-radius:8px 8px 0 0;z-index:3}.case-board{transform-origin:center -2px;border-radius:0 0 8px 8px;z-index:2}
.lid-inside,.lid-outside{backface-visibility:hidden;-webkit-backface-visibility:hidden}
.lid-outside{position:absolute;inset:0;transform:rotateX(180deg);display:grid;place-items:center;background:#ce1530;border:2px solid #ab1028;border-radius:6px;color:#efb0ba;font-size:38px;font-weight:bold}
.case .hinge{height:4px;margin:0;background:#b6122c;border-bottom:1px solid #b6122c}
.case[data-phase=close] .case-lid,.case[data-phase=turn] .case-lid,.case[data-phase=open] .case-lid,.case[data-phase=result] .case-lid{transform:rotateX(-180deg)}
.case[data-phase=turn],.case[data-phase=open],.case[data-phase=result]{transform:rotateX(-180deg)}
.case[data-phase=turn] .case-board,.case[data-phase=open] .case-board,.case[data-phase=result] .case-board{z-index:4}
.case[data-phase=open] .case-board,.case[data-phase=result] .case-board{transform:rotateX(-180deg)}
.case[data-phase=idle] .lid-outside,.case[data-phase=open] .lid-outside,.case[data-phase=result] .lid-outside{visibility:hidden}
.case[data-phase=turn] #numbered-board,.case[data-phase=open] #numbered-board,.case[data-phase=result] #numbered-board,.case.show-backs #bank-content{visibility:hidden}
.tile,.slot,.bank-empty{height:auto;aspect-ratio:1;min-height:44px}
#case-back{position:absolute;inset:8px;margin:0;display:flex;flex-direction:column;justify-content:center}#case-back figcaption{font-size:12px;color:white;margin-bottom:5px}
#pattern{display:block;width:100%;height:auto;aspect-ratio:3/1;object-fit:contain;transform:none!important}
.book-comparison{margin:16px 0}.book-comparison figcaption{font-size:14px;margin-bottom:8px}.book-comparison img{display:block;width:100%;height:auto;max-width:240px}
#check-stage{font-size:14px;min-height:22px;margin:8px 0}#check-stage:empty{display:none}.check-help,.edit-help,#solution-notice{font-size:12px;line-height:1.5;margin:8px 0;color:#52677a}#remove-selected{font-size:12px;padding:6px 10px}
.case.reduced,.case.reduced .case-lid,.case.reduced .case-board{transform:none!important;transition:none!important}.case.reduced .lid-outside{display:none}
@media(max-width:800px){.case-lid,.case-board{padding:6px}}
@media(prefers-reduced-motion:reduce){.case,.case-lid,.case-board{transform:none!important;transition:none!important}.lid-outside{display:none}}

.case[data-phase=idle],.case[data-phase=idle] .case-lid,.case[data-phase=idle] .case-board{transition:none}

/* R16: compact resting result only; close/turn/open keep their physical animation. */
.workspace>aside{min-width:0}
.runtime-heading h1{overflow-wrap:anywhere}
.case[data-phase=result],.case[data-phase=result] .case-lid{transform:none;transition:none}
.case[data-phase=result] .case-lid{min-height:0;border-radius:8px}
.case[data-phase=result] .case-board,.case[data-phase=result] .hinge,.case[data-phase=result] #bank-content{display:none}
.case[data-phase=result] #case-back{position:static}
aside:has(.case[data-phase=result]) #check-stage{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
#result{margin-top:12px;padding-top:12px}
#result h2{font-size:20px}
#score{font-size:20px;font-weight:700;margin:4px 0 10px}
.book-comparison{display:flex;align-items:center;gap:12px;margin:10px 0}
.book-comparison figcaption{font-size:13px;margin:0;flex:1}
.book-comparison img{width:48%;max-width:180px}
#book-pattern-note{font-size:12px;flex:1}
#remove-incorrect-group p{font-size:12px;line-height:1.4;margin:10px 0 6px}
#remove-incorrect{width:100%;min-height:44px;padding:10px 12px;font-size:14px}
.result-actions{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px;margin-top:8px}
.result-actions button{min-width:0;min-height:44px;padding:8px 6px;font-size:12px}
@media(min-width:801px){.workspace{grid-template-columns:minmax(0,1fr) minmax(330px,360px);gap:22px}}
@media(max-width:360px){.runtime-heading{flex-wrap:wrap;gap:0}.result-actions{grid-template-columns:repeat(2,minmax(0,1fr))}.result-actions #reset{grid-column:1/-1}}

/* R13: supplied series and publisher logos, with their original proportions. */
header .brand{display:inline-flex;align-items:center;flex-shrink:0;line-height:0}header .brand img{display:block;width:104px;height:auto}header .publisher-logo{display:block;width:190px;height:auto;max-width:100%}
@media(max-width:800px){header{flex-wrap:wrap;gap:12px 16px}header .brand img{width:80px}header .publisher-logo{width:150px}header .demo-label{flex-basis:100%;max-width:none;margin-left:0;font-size:10px}}

/* R17 homepage only. Runtime and admin selectors retain their existing styles. */
main:has(.home){padding-top:24px}
.home #results:focus{outline:none}
.home{min-width:0}.home-hero{padding:0 0 28px;max-width:900px}.home-hero h1{max-width:780px;font-size:clamp(32px,4.1vw,54px);line-height:1.08;margin:12px 0 16px}.home-hero .lead{max-width:790px;margin:0 0 20px;line-height:1.55}.home-hero>.primary{min-width:180px}
.home-hero .demo-context{max-width:790px;margin:20px 0 0;font-size:15px;line-height:1.6;color:#40556b}
.home-section{margin-top:34px;scroll-margin-top:16px}.home-section-heading{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:18px}.home-section-heading h2{font-size:26px;margin:0 0 7px}.home-section-heading p{margin:0;color:#52677a;font-size:15px}.home-section-heading>span{font-size:13px;color:#52677a;white-space:nowrap;padding-bottom:3px}.home .catalog{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.home .book-card{margin:0;max-width:none;min-width:0;padding:22px;gap:20px;align-items:start;border-radius:14px}.home .book-details{min-width:0;flex:1}.home .book-card h2{font-size:20px;line-height:1.3;margin:0 0 8px;overflow-wrap:anywhere}.home .book-card p{font-size:13px;margin:0 0 16px;color:#52677a}.home .book-card .primary{font-size:14px;padding:11px 13px}.book-shop-link{display:flex;align-items:center;min-height:44px;font-size:13px;margin-top:4px;text-underline-offset:3px}
.home-cover{position:relative;flex:0 0 108px;width:108px;height:144px;overflow:hidden;border-radius:6px;background:#eef2f6}.home-cover-fallback{position:absolute;inset:0;display:grid;align-content:center;gap:10px;text-align:center;color:#52677a;font-size:10px;line-height:1.5}.home-cover-fallback strong{font-size:24px;color:#155eac}.home .book-cover{position:absolute;inset:0;width:100%;height:100%;max-height:none;object-fit:contain;opacity:0;background:white}.home .book-cover.loaded{opacity:1}.has-cover .home-cover-fallback{visibility:hidden}
.department-browser{padding:18px;background:#edf3f9;border-radius:14px}.department-browser a{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:48px;padding:12px 14px;border:1px solid #c3d2e1;border-radius:8px;text-decoration:none;background:white;font-size:15px;line-height:1.4}.department-browser a:hover{border-color:#155eac;background:#f6faff}.department-browser a[aria-current=page]{border-color:#155eac;background:#155eac;color:white;font-weight:700}.department-browser a span{font-size:12px;min-width:24px;text-align:center}.department-browser .all-departments{display:inline-flex;margin-bottom:12px}.department-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:0;padding:0;list-style:none}.department-list li{min-width:0}.department-list ul{list-style:none;margin:8px 0 0;padding-left:12px;border-left:2px solid #c3d2e1}.department-list ul li+li{margin-top:8px}.department-list summary{padding:12px 4px;min-height:44px;cursor:pointer;font-size:13px;line-height:1.4;color:#29455f}.department-list summary:focus-visible{outline:3px solid #1683dc;outline-offset:2px}.home-empty{grid-column:1/-1;padding:24px;border:1px dashed #b5c5d4;border-radius:12px}.home-empty h3{margin:0 0 8px}.home-empty p{margin:0}.home-next{display:flex;align-items:center;justify-content:space-between;gap:28px;margin-top:40px;padding:28px;background:white;border:1px solid #d9e0e7;border-radius:14px}.home-next h2{margin:0 0 8px;font-size:24px}.home-next p{max-width:660px;margin:0;color:#52677a;font-size:15px}.home-next-actions{flex-shrink:0;display:flex;flex-direction:column;gap:8px;align-items:center}.home-next-actions>a{display:inline-flex;align-items:center;min-height:44px;font-size:14px}
@media(max-width:900px){.home .catalog{grid-template-columns:minmax(0,1fr)}.home-next{align-items:start;flex-direction:column}}
@media(max-width:600px){.home-hero{padding-bottom:24px}.home-hero h1{letter-spacing:-.8px}.home-hero .lead{font-size:17px}.home-section-heading{align-items:start;flex-direction:column;gap:4px}.home-section-heading h2{font-size:23px}.home .book-card{flex-direction:row;padding:16px;gap:14px}.home-cover{flex-basis:76px;width:76px;height:102px}.home .book-card h2{font-size:18px}.home .book-card .primary{width:100%;padding:10px 8px;font-size:13px}.department-list{grid-template-columns:minmax(0,1fr)}.department-browser{padding:12px}.home-next{padding:20px}.home-next-actions{width:100%;align-items:stretch}.home-next-actions>a{justify-content:center}.home-section{margin-top:28px}}
@media(min-width:901px){.home-hero h1{font-size:48px}.home-section{margin-top:28px}}

/* Analytics consent is deliberately local to the demo and loads before GTM. */
.analytics-consent{position:fixed;z-index:1000;left:16px;right:16px;bottom:16px;max-width:920px;margin:auto;padding:18px 20px;display:flex;align-items:center;justify-content:space-between;gap:24px;background:#fff;color:#20344b;border:1px solid #b9c8d6;border-radius:12px}.analytics-consent strong{display:block;margin-bottom:4px}.analytics-consent p{margin:0;font-size:13px;line-height:1.5;color:#52677a}.analytics-consent-actions{display:flex;flex-shrink:0;gap:8px}.analytics-consent-actions button{white-space:nowrap}
@media(max-width:700px){.analytics-consent{align-items:stretch;flex-direction:column;gap:12px}.analytics-consent-actions{display:grid;grid-template-columns:1fr}.analytics-consent-actions button{width:100%}}