/* The opening keeps the approved Asteria world; the lesson uses real magnets. */
.il-game-brief{position:fixed;inset:0;margin:auto;width:min(1000px,calc(100vw - 48px));max-width:none;max-height:calc(100dvh - 48px);padding:0;border:1px solid #adc3d4;border-radius:10px;background:#f8fcff;color:#234f6f;box-shadow:0 25px 100px #143b6355;overflow:hidden}
.il-game-brief::backdrop{background:#183a5c70;backdrop-filter:blur(5px)}
.il-game-brief-shell{position:relative;display:grid;grid-template-columns:minmax(0,.82fr) minmax(0,1.18fr);grid-template-rows:minmax(0,1fr) auto;height:min(720px,calc(100dvh - 48px));min-height:0}
.il-game-brief-visual{position:relative;grid-row:1/3;min-width:0;min-height:0;overflow:hidden;background:#e4f2f5}
.il-game-brief-visual>.il-scene{margin:0;width:100%;height:100%;min-height:0;border:0;border-radius:0;box-shadow:none}
.il-game-brief-visual picture,.il-game-brief-visual img{display:block;width:100%;height:100%;object-fit:cover;object-position:48% 60%}
.il-game-brief-visual figcaption{display:none}
.il-game-brief-caption{position:absolute;left:18px;right:18px;bottom:20px;max-width:28em;padding:10px 12px;border-left:2px solid #cca24d;background:#fcfdf8ed;color:#28536d;font:11px/1.45 var(--sans);letter-spacing:.08em;text-transform:uppercase}
.il-game-brief-content{min-width:0;min-height:0;overflow:auto;overscroll-behavior:contain;padding:30px 34px 16px;scrollbar-gutter:stable}
.il-game-brief-top{display:flex;align-items:center;min-height:32px;padding-right:40px;margin-bottom:12px}
.il-game-brief-top .eyebrow{font-size:11px;letter-spacing:.11em;margin:0;color:#846443}
.il-game-brief-close{position:absolute;top:14px;right:14px;z-index:2;display:grid;place-items:center;width:44px;height:44px;min-height:44px;padding:0;border:0;background:#f8fcfff0;border-radius:50%;color:#49677e;font:28px/1 var(--sans)}
.il-game-brief .il-game-brief-title{font:normal clamp(31px,3.6vw,43px)/1.08 Georgia,serif;letter-spacing:-.035em;color:#194b70;margin:0 0 20px;max-width:12em}
.il-game-brief-lead{font:18px/1.55 Georgia,serif;margin:0 0 19px;color:#335976}
.il-game-brief-body{font:16px/1.55 var(--sans);margin:0 0 14px;color:#45647a}
.il-game-brief-goal{border-left:2px solid #c7993b;padding:4px 0 4px 15px;margin:0 0 20px}
.il-game-brief-goal span{display:block;font:11px/1.4 var(--sans);letter-spacing:.1em;text-transform:uppercase;color:#866642;margin-bottom:5px}
.il-game-brief-goal strong{display:block;font:25px/1.2 Georgia,serif;color:#194b70}
.il-game-brief-terms{margin:21px 0 0;border-top:1px solid #bfced9;padding-top:14px}
.il-game-brief-terms>div{display:grid;grid-template-columns:100px minmax(0,1fr);gap:13px;margin-bottom:10px}
.il-game-brief-terms dt{font:18px/1.35 Georgia,serif;color:#254f6a}
.il-game-brief-terms dd{margin:0;font:14px/1.5 var(--sans);color:#526e81}
.il-game-brief-example{margin:5px 0 24px;padding:15px 12px 20px;background:#fffefa;border-top:2px solid #c9a64b;border-bottom:1px solid #c7d6df}
.il-game-brief-example-words{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));align-items:end}
.il-game-brief-example-words>div{min-width:0;text-align:center;border-bottom:2px solid #5a788f;position:relative;padding:0 5px 7px}
.il-game-brief-example-words>div+div:after{content:'';position:absolute;left:0;bottom:-8px;height:38px;width:1px;background:#5a788f}
.il-game-brief-example-words span{display:block;font:11px/1.35 var(--sans);color:#577185;margin-bottom:11px}
.il-game-brief-example-words strong{display:inline-block;font:23px/1.2 Georgia,serif;color:#234d6a}
.il-game-brief-how{list-style:none;margin:0 0 18px;padding:0}
.il-game-brief-how li{position:relative;padding-left:31px;margin:0 0 13px;font:15px/1.5 var(--sans);color:#45647a}
.il-game-brief-how-number{position:absolute;left:0;top:1px;display:grid;place-items:center;width:22px;height:22px;border:1px solid #aac5d5;border-radius:50%;font:14px/1 Georgia,serif;color:#325a79}
.il-game-brief-how strong{display:block;color:#234f70;font-weight:650;margin-bottom:2px}
.il-game-brief-feedback{margin:0 0 13px;padding-left:12px;border-left:2px solid #9bb6c7;font:15px/1.55 var(--sans);color:#426078}
.il-game-brief-feedback .is-correct{color:#386f52}
.il-game-brief-feedback .is-retry{color:#9c4238}
.il-game-brief-reassurance{margin:0;font:14px/1.5 var(--sans);color:#5a7182}
.il-game-brief-footer{grid-column:2;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:18px 34px 24px;border-top:1px solid #d5e1e8;background:#f8fcff}
.il-game-brief-footer>.primary{margin-left:auto;min-height:48px;font-size:16px}
.il-game-brief-footer>.quiet{padding-left:0;flex:none}
.il-intro-practice-label{margin:0 0 0 auto;color:#5c768b;font:13px/1.4 var(--sans)}
.il-case .il-practice-explanation{font:15px/1.5 var(--sans);color:#587285;margin:0 0 15px;max-width:37em}
.il-introduction{min-width:0;padding:4px 0 28px}
.il-intro-top{display:flex;align-items:center;gap:20px;margin:0 0 22px;min-width:0}
.il-intro-top>.quiet{flex:none;padding:8px 4px;color:#42617a}
.il-intro-progress{display:flex;flex:1;list-style:none;justify-content:flex-end;gap:24px;margin:0;padding:0;font:13px/1.4 var(--sans);color:#698197}
.il-intro-progress li{display:flex;align-items:center;gap:8px}
.il-intro-number{display:inline-grid;place-items:center;width:25px;height:25px;border:1px solid #b8ccd9;border-radius:50%;font:14px/1 Georgia,serif}
.il-intro-progress .is-current{color:#194676;font-weight:650}
.il-intro-progress .is-current .il-intro-number{border-color:#c56748;background:#c56748;color:white;box-shadow:0 0 0 4px #cfaf7520}
.il-intro-progress .is-done .il-intro-number{border-color:#6f9b86;color:#366f56;background:#f4faf6}
.il-intro-spread{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);gap:48px;align-items:center}
.il-intro-visual{align-self:stretch;min-width:0}
.il-intro-visual>.il-scene{height:100%;min-height:470px;margin:0}
.il-intro-visual>.il-scene img{object-position:center}
.il-intro-copy{min-width:0;padding:20px 0}
.il-case .il-intro-copy h1{font-size:clamp(38px,4.3vw,60px);line-height:1.06;margin:15px 0 24px;max-width:11em}
.il-intro-lead{font:21px/1.55 Georgia,serif;max-width:29em;color:#2a4e69;margin:0 0 26px}
.il-intro-definition{border-left:2px solid #c6a04c;padding:0 0 0 20px;margin:24px 0 28px}
.il-case .il-intro-definition h2{font:25px/1.2 Georgia,serif;margin:0 0 8px}
.il-intro-definition p,.il-intro-definitions dd{font:17px/1.6 var(--sans);color:#47637b;margin:0}
.il-intro-definitions{margin:0 0 24px}
.il-intro-definitions>div{padding:17px 0;border-bottom:1px solid #bed1df}
.il-intro-definitions>div:first-child{padding-top:0}
.il-intro-definitions dt{font:29px/1.2 Georgia,serif;color:#174676;margin-bottom:8px}
.il-intro-aside{font:16px/1.6 var(--sans);color:#49677e;margin:0 0 25px}
.il-intro-copy>.primary{font-size:16px;min-height:48px}
.il-introduction.has-practice .il-intro-spread{grid-template-columns:minmax(0,.72fr) minmax(0,1.28fr);gap:32px;align-items:start}
.il-introduction.has-practice .il-intro-visual>.il-scene{min-height:430px;max-height:560px}
.il-introduction.has-practice .il-intro-copy{padding:0}
.il-case .il-introduction.has-practice h1{font-size:39px;margin:10px 0 18px;max-width:14em}
.il-intro-practice{margin:0 0 20px;border:1px solid #b4c9d7;background:#fffefa;border-radius:8px;overflow:visible;box-shadow:0 4px 0 #dae5ec}
.il-intro-practice-heading{padding:18px 20px 0}
.il-case .il-intro-practice-heading h2{font:28px/1.2 Georgia,serif;margin:0 0 14px}
.il-practice-progress{display:flex;gap:18px;list-style:none;counter-reset:practice;margin:0;padding:0;font:13px/1.4 var(--sans);color:#667f91}
.il-practice-progress li{counter-increment:practice;display:flex;gap:6px;align-items:center}
.il-practice-progress li:before{content:counter(practice);font:13px/1 Georgia,serif;border-bottom:1px solid #b9cbd6;padding:2px}
.il-practice-progress .is-current{color:#174777;font-weight:650}
.il-practice-progress .is-current:before{color:#b95034;border-color:#b95034}
.il-practice-progress .is-done:before{content:'✓';color:#427859;border-color:#427859}
.il-case .il-practice-instruction{margin:15px 20px 3px;padding-left:12px;border-left:2px solid #cd6b4c;font:16px/1.55 var(--sans);color:#315770;min-height:50px}
.il-practice-board{padding:0 14px 10px}
.il-practice-board .relation-reading{display:none}
.il-practice-board .magnet-shelf{border-bottom:0}
.il-introduction[data-practice-phase=ready] .il-practice-instruction{color:#346e50;border-color:#548b66}
.il-introduction[data-practice-phase=remove] .diagram-word[data-token-id=practice-clues] .word-face{outline:2px solid #c66b4b;outline-offset:4px}
.il-introduction .il-intro-copy{animation:il-intro-arrive .25s ease-out both}
@keyframes il-intro-arrive{from{opacity:.6;transform:translateY(6px)}to{opacity:1;transform:none}}
@media(max-width:800px){
 .il-intro-top{gap:12px;margin-bottom:15px;flex-wrap:wrap}
 .il-intro-progress{gap:15px;font-size:12px}
 .il-intro-progress li{gap:6px}
 .il-intro-progress li:not(.is-current)>span:last-child{display:none}
 .il-intro-spread,.il-introduction.has-practice .il-intro-spread{grid-template-columns:1fr;gap:20px}
 .il-intro-visual>.il-scene,.il-introduction.has-practice .il-intro-visual>.il-scene{height:clamp(185px,28svh,280px);min-height:0;max-height:none}
 .il-intro-visual>.il-scene img{object-position:50% 66%}
 .il-intro-copy{padding:0}
 .il-case .il-intro-copy h1{font-size:38px;max-width:14em;margin:9px 0 18px}
 .il-intro-lead{font-size:20px;line-height:1.5;margin-bottom:20px}
 .il-intro-definition{margin:20px 0;padding-left:16px}
 .il-intro-definition p,.il-intro-definitions dd{font-size:16px;line-height:1.55}
 .il-intro-definitions>div{padding:13px 0}
 .il-intro-definitions dt{font-size:27px;margin-bottom:6px}
 .il-intro-copy>.primary{width:100%}
 .il-introduction.has-practice .il-intro-visual>.il-scene{height:135px}
 .il-case .il-introduction.has-practice h1{font-size:32px;margin:7px 0 15px}
 .il-intro-practice-heading{padding:16px 14px 0}
 .il-case .il-practice-instruction{margin:12px 14px 4px;font-size:15px;min-height:0}
 .il-practice-progress{gap:14px}
 .il-practice-board{padding:0 13px 8px}
 .il-practice-board .diagram-scroll{max-height:none}
}
@media(max-width:650px){
 .il-game-brief{width:calc(100vw - 24px);max-height:calc(100dvh - 24px);border-radius:8px}
 .il-game-brief-shell{grid-template-columns:minmax(0,1fr);grid-template-rows:140px minmax(0,1fr) auto;height:min(790px,calc(100dvh - 24px))}
 .il-game-brief-visual{grid-row:1;grid-column:1}
 .il-game-brief-visual img{object-position:50% 61%}
 .il-game-brief-caption{left:15px;right:52px;bottom:12px;padding:6px 9px;font-size:9px;max-width:30em}
 .il-game-brief-content{padding:18px 22px 16px;grid-column:1;grid-row:2}
 .il-game-brief-top{min-height:20px;padding-right:0;margin-bottom:12px}
 .il-game-brief-close{top:9px;right:9px;box-shadow:0 2px 8px #244b6820}
 .il-game-brief .il-game-brief-title{font-size:33px;margin-bottom:15px;max-width:12em}
 .il-game-brief-lead{font-size:17px;line-height:1.5;margin-bottom:16px}
 .il-game-brief-body{font-size:15px;line-height:1.5}
 .il-game-brief-goal{margin-bottom:17px;padding-left:12px}
 .il-game-brief-goal strong{font-size:24px}
 .il-game-brief-terms{margin-top:17px;padding-top:12px}
 .il-game-brief-terms>div{grid-template-columns:88px minmax(0,1fr);gap:9px}
 .il-game-brief-terms dt{font-size:17px}
 .il-game-brief-terms dd{font-size:14px}
 .il-game-brief-example{padding:13px 6px 17px;margin-bottom:20px}
 .il-game-brief-example-words strong{font-size:21px}
 .il-game-brief-example-words span{font-size:10px}
 .il-game-brief-footer{grid-column:1;grid-row:3;padding:14px 20px 17px;gap:10px}
 .il-game-brief-footer>.primary{flex:1;font-size:15px;padding:10px 12px}
 .il-game-brief-footer>.quiet{font-size:14px;padding-right:4px}
}
@media(max-height:550px) and (min-width:651px){.il-game-brief-shell{grid-template-columns:minmax(0,.65fr) minmax(0,1.35fr)}.il-game-brief-content{padding-top:18px}.il-game-brief .il-game-brief-title{font-size:32px}.il-game-brief-footer{padding-top:12px;padding-bottom:14px}}
@media(max-width:374px){.il-intro-progress{gap:10px}.il-case .il-intro-copy h1{font-size:34px}.il-case .il-introduction.has-practice h1{font-size:30px}.il-intro-practice-heading h2{font-size:26px}.il-intro-top{gap:6px}.il-intro-practice{width:calc(100% + 14px);max-width:none;margin-left:-7px;margin-right:-7px}.il-practice-board{padding-left:0;padding-right:0}.il-case .il-introduction .il-practice-board .magnet-shelf{margin-left:0;margin-right:0}}
@media(max-height:500px) and (min-width:600px){.il-intro-spread,.il-introduction.has-practice .il-intro-spread{grid-template-columns:minmax(0,.7fr) minmax(0,1.3fr);gap:24px}.il-intro-visual>.il-scene,.il-introduction.has-practice .il-intro-visual>.il-scene{height:280px;min-height:0}.il-case .il-intro-copy h1{font-size:34px}}
@media(prefers-reduced-motion:reduce){.il-introduction .il-intro-copy{animation:none;transition:none}}