/* Full-width photo strip, readable overlay copy, no game animation. */
body{min-height:100svh;display:flex;flex-direction:column}
main{flex:1;min-width:0}
.site-header nav>span{display:flex;align-items:center;gap:32px}
.reading-progress{opacity:0;transition:opacity .2s}
.level-expanded .reading-progress{opacity:1}
.curriculum-intro{padding-top:calc(var(--header) + 58px);padding-bottom:25px}
.curriculum-intro h1{font-size:clamp(28px,3.1vw,42px);font-weight:600;line-height:1.35;letter-spacing:-.04em;margin-top:15px}
.curriculum-intro>p:last-child{font-size:15px;color:var(--muted);line-height:1.9;margin-top:14px;max-width:760px}
.level-list{padding-bottom:38px;scroll-margin-top:calc(var(--header) + 24px)}
.level-card{border:0;border-radius:0;background:none;scroll-margin-top:calc(var(--header) + 24px)}
.level-banner{position:relative;isolation:isolate;display:grid;grid-template-columns:64px minmax(0,1fr);gap:24px;align-items:center;padding:0 max(56px,calc((100vw - 1240px)/2));height:var(--photo-height);cursor:pointer;list-style:none;background:var(--bg);--photo-height:240px;transition:height .55s cubic-bezier(.2,.65,.25,1)}
.level-banner::before{content:none}
.level-banner::after{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;background:linear-gradient(90deg,rgba(5,7,13,.80),rgba(5,7,13,.68) 48%,rgba(5,7,13,.26));}
.level-banner::-webkit-details-marker{display:none}
.level-banner::marker{content:""}
.level-banner:focus-visible{outline:2px solid var(--cyan);outline-offset:-6px}
.level-index{display:flex;flex-direction:column;gap:4px;color:#a4d9ff}
.level-index small{font:10px/1.6 ui-monospace,Consolas,monospace;letter-spacing:.16em;color:#d3ddeb}
.level-index strong{font:500 48px/1.2 ui-monospace,Consolas,monospace;letter-spacing:-.08em}
.level-banner-copy{padding-block:24px;min-width:0;max-width:650px}
.level-meta{font-size:12px;color:#dbe5f4;display:flex;gap:11px;flex-wrap:wrap;align-items:center;line-height:1.7}
.level-meta>span{color:#a4bad1}
.level-banner h2{font-size:29px;font-weight:600;letter-spacing:-.035em;line-height:1.4;margin-top:9px;transition:color .2s}
.level-banner:hover h2{color:var(--cyan)}
.level-teaser{font-size:14px;line-height:1.8;color:#d0dbea;margin-top:9px;max-width:570px}
.level-highlights{display:flex;gap:18px;flex-wrap:wrap;margin-top:18px;font-size:12px;color:#a4dbff}
.level-highlights>span+span{border-left:1px solid #34516c;padding-left:18px}
.level-banner-photo{position:absolute;inset:0;z-index:-2;min-width:0;overflow:hidden;pointer-events:none}
.level-banner-photo img{display:block;width:100%;height:100%;object-fit:cover;object-position:center;opacity:1;filter:none;mask-image:none}
.level-card[open]>.level-banner,.level-banner:focus-visible{--photo-height:360px}
@media(hover:hover) and (pointer:fine){.level-banner:hover{--photo-height:360px}}
.level-detail{background:var(--bg);animation:level-unfold .45s ease-out}
.level-detail .hero{min-height:0;display:flex;flex-direction:column;align-items:center;text-align:center;padding:68px 32px 78px;gap:0}
.level-detail .hero-copy{padding:0}
.level-detail .hero-copy>.eyebrow,.level-detail .hero-actions,.level-detail .hero-facts{justify-content:center}
.level-detail .hero-facts{margin-top:34px}
.hero-title{font-size:clamp(36px,4.2vw,58px);line-height:1.28;letter-spacing:-.045em;font-weight:650}
.hero-title span{color:var(--cyan)}
.level-detail .hero-actions{gap:22px}
.level-detail .hero-actions .quiet-link{font-size:12px}
.level-detail .statement{padding-block:85px 95px}
.level-detail-end{display:flex;justify-content:center;padding:0 24px 50px}
#collapseLevel{color:#c1e7ff}
@keyframes level-unfold{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
@media(max-width:1150px){
  .level-banner{grid-template-columns:56px minmax(0,1fr);gap:20px;padding-inline:40px;--photo-height:230px}
  .level-banner h2{font-size:27px}
  .level-index strong{font-size:43px}
  .level-card[open]>.level-banner,.level-banner:focus-visible{--photo-height:340px}
}
@media(max-width:1150px) and (hover:hover) and (pointer:fine){.level-banner:hover{--photo-height:340px}}
@media(max-width:980px){
  .curriculum-intro{padding-top:calc(var(--header) + 42px)}
  .level-banner{grid-template-columns:minmax(0,1fr);padding-inline:32px;--photo-height:230px}
  .level-index{display:none}
  .level-banner h2{font-size:26px}
  .level-highlights{gap:12px}
  .level-highlights>span+span{padding-left:12px}
  .site-header nav{gap:20px}
  .site-header nav>span{gap:20px}
}
@media(max-width:700px){
  .curriculum-intro{padding-top:calc(var(--header) + 34px);padding-bottom:18px}
  .curriculum-intro h1{font-size:29px;max-width:480px}
  .curriculum-intro>p:last-child{font-size:13px;line-height:1.85;margin-top:12px}
  .level-list{padding-bottom:22px}
  .level-banner{grid-template-columns:minmax(0,1fr);gap:0;padding:0;--photo-height:220px}
  .level-banner::after{background:rgba(5,7,13,.68)}
  .level-banner-photo img{object-position:52% center}
  .level-banner-copy{padding:24px 20px}
  .level-meta{font-size:12px;gap:7px}
  .level-banner h2{font-size:23px;margin-top:10px}
  .level-teaser{font-size:13px;line-height:1.85;margin-top:8px}
  .level-highlights{display:none}
  .level-card[open]>.level-banner,.level-banner:focus-visible{--photo-height:290px}
  .level-detail .hero{padding:47px 22px 70px}
  .hero-title{font-size:clamp(30px,7.7vw,43px)}
  .level-detail .hero-facts{margin-top:28px;gap:24px}
  .level-detail .hero-actions{gap:16px}
  .level-detail .hero-actions .quiet-link{font-size:12px}
  .level-detail .statement{padding-block:65px 75px}
  .level-detail-end{padding-bottom:35px}
  .header-tools{gap:10px}
  .header-tools button{font-size:12px}
  .level-expanded .preview-mark{display:none}
}
@media(max-width:700px) and (hover:hover) and (pointer:fine){.level-banner:hover{--photo-height:290px}}
@media(max-width:360px){
  .curriculum-intro h1{font-size:26px}
  .level-banner h2{font-size:20px}
  .level-meta{gap:5px}
  .level-detail .hero{padding-inline:20px}
  .hero-title{font-size:28px}
  .level-detail .hero-facts{gap:16px}
  .level-detail .hero-facts strong{font-size:21px}
  .level-detail .hero-facts strong span{font-size:11px}
}
.reduce-motion .level-banner{transition:none}
.is-switching-level{overflow-anchor:none;scroll-behavior:auto}
.is-switching-level .level-banner{transition:none}
.is-switching-level .level-detail{animation:none}
@media(prefers-reduced-motion:reduce){.level-detail{animation:none}.level-banner{transition:none}}