:root{color-scheme:light;--ink:#43230f;--teal:#246775;--gold:#b88335;--paper:#e9c88d;--cream:#fff0ce;--texture:repeating-linear-gradient(0deg,#75451d08 0 1px,transparent 1px 4px),repeating-linear-gradient(90deg,#fff2c414 0 1px,transparent 1px 7px),linear-gradient(110deg,#d5a45f,#e9c88d 45%,#dbb579)}
*{box-sizing:border-box}body{margin:0;min-height:100vh;color:var(--ink);background:radial-gradient(ellipse at 50% 20%,#ffe5af99,transparent 70%),var(--texture);font-family:Georgia,'Times New Roman',serif;border-inline:10px solid #714318}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;touch-action:manipulation;cursor:pointer}button:focus-visible,a:focus-visible,summary:focus-visible{outline:4px solid var(--teal);outline-offset:5px}button:disabled{cursor:default}a{color:var(--teal)}.skip{position:absolute;top:-100px;left:20px;z-index:10;background:var(--cream);padding:16px}.skip:focus{top:20px}.edge{height:14px;background:repeating-linear-gradient(90deg,#246775 0 20px,#b88335 20px 23px,#a94d2b 23px 36px,#b88335 36px 39px);border-block:3px solid #714318}.masthead{text-align:center;padding:14px 24px 0}.emblem{display:block;width:min(42vw,530px);height:auto;margin:0 auto 3px}.eyebrow{font:700 12px/1.5 Arial,sans-serif;text-transform:uppercase;letter-spacing:.19em;margin:0 0 9px}h1{font-size:clamp(40px,4.4vw,76px);line-height:1;margin:0;text-shadow:0 1px #ffe6ae}h1 span{display:block;font:500 clamp(20px,2.1vw,34px)/1.5 Arial,sans-serif;text-transform:uppercase;letter-spacing:.19em;margin-top:7px}.subtitle{font:17px/1.5 Arial,sans-serif;margin:9px 0 0}.invitation{font:17px/1.6 Arial,sans-serif;text-align:center;max-width:970px;margin:22px auto 28px}main{max-width:1500px;margin:auto;padding:0 30px}main:focus{outline:none}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}.card{padding:7px;border:3px solid #764516;border-radius:26px;background:linear-gradient(120deg,#d5a45f,#f5d79e,#b88335);color:var(--ink);box-shadow:inset 0 0 0 2px #f7d387,0 5px 0 #8c5b2570,0 12px 25px #64321325;overflow:hidden;text-align:left;transition:transform .2s,box-shadow .2s;display:flex;flex-direction:column}.card>img{width:100%;height:auto;aspect-ratio:720/520;object-fit:cover;border-radius:16px 16px 3px 3px;display:block;border:1px solid #88501d}.card-label{display:flex;flex-direction:column;flex:1;padding:20px;border:1px solid #9c662c;border-radius:3px 3px 15px 15px;background:linear-gradient(115deg,#f9dda588,#e9c88d88),var(--texture)}.card small{font:700 11px/1.5 Arial,sans-serif;letter-spacing:.12em;text-transform:uppercase;color:#704919}.card strong{display:block;font-size:clamp(26px,2.3vw,38px);line-height:1.1;margin:10px 0 14px}.card strong span{display:block;font-size:.76em;margin-top:5px}.card-copy{font:16px/1.5 Arial,sans-serif;display:block;margin-bottom:18px}.explore{display:flex;align-items:center;justify-content:space-between;font:700 14px Arial,sans-serif;color:var(--teal);border-top:1px solid #99662c55;padding-top:11px;margin-top:auto}.explore b{font-size:24px}.card:hover{transform:translateY(-5px);box-shadow:inset 0 0 0 2px #f7d387,0 10px 0 #8c5b2550,0 17px 28px #64321330}.home-note{text-align:center;font:13px/1.5 Arial,sans-serif;margin:29px 0 10px}.home-note span{color:var(--teal);margin-right:8px}footer{max-width:1500px;margin:16px auto 0;padding:16px 30px 23px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;font:13px/1.5 Arial,sans-serif}footer i{margin:0 10px;color:#9d6327}.footer-actions{display:flex;gap:10px}.text-button{background:#ffe4ac33;border:1px solid #895c2c99;border-radius:7px;color:var(--ink);font:700 14px/1.3 Arial,sans-serif;min-height:44px;padding:12px 16px}.text-button:hover{background:#f9dda5}.detail-toolbar{display:flex;justify-content:space-between;align-items:center;margin:24px 0 20px;font:700 13px Arial,sans-serif}.detail-layout{display:grid;grid-template-columns:42% 1fr;gap:40px;align-items:start}.illustration{margin:0}.illustration>img{display:block;width:100%;height:auto;border-radius:16px;border:2px solid #98642c;box-shadow:0 7px 20px #64321320}.illustration figcaption{font:11px/1.5 Arial,sans-serif;margin:8px 0 0;color:#69471f}.reading{padding:7px 0}h2{font-size:clamp(32px,3vw,48px);line-height:1.12;margin:0 0 24px}h2:focus{outline:none}#topic-text p{font:clamp(19px,1.4vw,23px)/1.6 Arial,sans-serif;margin:0 0 17px}.curiosity{border:1px solid #24677555;border-left:5px solid var(--teal);background:#fff0ce66;padding:22px 25px;margin-top:25px;border-radius:0 12px 12px 0}.curiosity .eyebrow{font-size:10px;color:var(--teal)}.curiosity h3{font-size:28px;margin:0 0 10px;color:var(--teal)}.curiosity p,.modern-math p{font:18px/1.6 Arial,sans-serif;margin:0}.modern-math{border-top:1px solid #98642c66;margin-top:26px;padding:22px 10px}.modern-math h3{font-size:24px;margin:0 0 15px}.modern-math p+p{margin-top:12px}.modern-math .formula{font-size:30px;font-weight:700;color:var(--teal);margin-bottom:12px}.activity{margin-top:32px;padding:30px 34px;background:linear-gradient(125deg,#fff2d4bb,#f5d79e88);border:2px solid #a16c30;border-radius:18px;box-shadow:0 5px 20px #64321315;font:19px/1.6 Arial,sans-serif}.activity-heading{display:flex;justify-content:space-between;align-items:center;gap:16px}.activity-heading h3{font:700 clamp(27px,2.3vw,36px)/1.2 Georgia,serif;margin:0}.activity-heading .eyebrow{color:var(--teal)}.activity>p{margin:18px 0}.pyramid-chart{max-width:960px;margin:10px auto 0}.pyramid-chart svg{display:block;width:100%;height:auto;overflow:visible}.chart-pyramid{fill:#ba894c;stroke:#70451e;stroke-width:1.3;transition:opacity .25s,fill .25s}.pyramid-chart.has-selection .chart-group{opacity:.35}.pyramid-chart.has-selection .chart-group.selected{opacity:1}.chart-group.selected .chart-pyramid{fill:var(--teal)}.chart-label{font:17px Arial,sans-serif;fill:#43230f}.chart-value{font:bold 19px Arial,sans-serif;fill:#246775}.choices{display:flex;flex-wrap:wrap;gap:12px;margin:22px 0 18px}.choices button{background:#fff2d099;border:2px solid #95612c;border-radius:9px;padding:13px 25px;min-height:50px;font:700 18px/1.3 Arial,sans-serif;color:var(--ink);transition:background .15s,transform .15s}.choices button:hover{background:#ffedc7;transform:translateY(-2px)}.choices button[aria-pressed=true],.choices button.correct{background:var(--teal);border-color:var(--teal);color:#fff6df}.choices button.incorrect{border-style:dashed;border-color:#934324;background:#a94d2b12}.feedback{padding:17px 20px;background:#e4c18a66;border:1px solid #a16c3055;border-radius:8px;min-height:64px;font:18px/1.55 Arial,sans-serif;margin:16px 0}.feedback.success{background:#24677512;border-color:#24677588}.calculation{color:var(--teal);font-size:clamp(23px,2.2vw,32px);font-weight:700;margin:10px 0}.annotation{display:block;font:13px/1.6 Arial,sans-serif;color:#684621}.activity>.annotation{margin:15px 0 0}.exercise-layout{display:grid;grid-template-columns:32% 1fr;gap:36px;align-items:center;margin-top:15px}.square-diagram{text-align:center;max-width:340px}.square-diagram svg{width:100%;height:auto;display:block}.square-fill{fill:#d5a45f55;transition:fill .3s}.square-diagram.solved .square-fill{fill:#24677525}.question{font-weight:600}.build-scene{display:flex;align-items:center;justify-content:center;gap:35px;padding:12px}.build-scene>svg{width:200px;flex-shrink:0}.build-scene strong{font:700 14px Arial,sans-serif}.block-pool{display:grid;grid-template-columns:repeat(8,30px);gap:5px;margin-top:15px;min-height:70px}.block{display:block;width:30px;height:22px;border:1px solid #81532c;border-radius:2px;background:linear-gradient(140deg,#f2d392,#b88335);box-shadow:2px 2px 0 #85552955}.teams{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-top:22px}.team{padding:15px;border:1px solid #98642c77;border-radius:10px;min-height:135px;background:#f9e7bc55}.team-title{display:flex;align-items:center;gap:10px;font:700 15px Arial,sans-serif}.team svg{width:36px;height:36px}.team-blocks{display:grid;grid-template-columns:repeat(3,30px);gap:6px;margin:16px auto 6px;width:max-content;min-height:50px}.team .block{animation:deliver .4s both;animation-delay:var(--delay,0ms)}.team-count{font:14px Arial,sans-serif;color:var(--teal);margin:8px 0 0}.success-message{font-weight:700;color:var(--teal)}.topic-nav{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;margin:28px 0 12px;gap:18px;padding-top:20px;border-top:1px solid #98642c66}.nav-button{border:1px solid #75451d;border-radius:9px;padding:15px 22px;background:var(--ink);color:#ffe4af;font:700 16px Arial,sans-serif;min-height:50px;justify-self:start}.nav-button:last-child{justify-self:end}.nav-button:hover{background:#684020}.nav-button[hidden]{display:block!important;visibility:hidden;pointer-events:none}.dots{display:flex;gap:8px}.dots button{border:1px solid transparent;background:transparent;width:44px;height:44px;border-radius:50%;padding:14px;position:relative}.dots button::before{content:'';position:absolute;inset:14px;border:1px solid var(--ink);border-radius:50%}.dots button[aria-current=true]::before{background:var(--teal);border-color:var(--teal)}.sources{max-width:1440px;margin:0 auto 25px;padding:25px 30px;background:#ffedc077;border:1px solid #a16c30;border-radius:10px;font:16px/1.7 Arial,sans-serif}.sources h2{font:700 30px Georgia,serif}.sources li{margin:7px 0}.sources a{overflow-wrap:anywhere}[hidden]{display:none!important}#screen-status:empty{display:none}.detail-layout,.activity{animation:reveal .3s ease-out}@keyframes reveal{from{opacity:0;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}@keyframes deliver{from{opacity:0;transform:translateY(-15px)}to{opacity:1;transform:translateY(0)}}
@media(min-width:1700px){.masthead{padding-top:18px}.emblem{width:570px}.cards{gap:34px}.card-label{padding:23px}.invitation{font-size:18px}.home-note{margin-top:34px}}
@media(max-width:1000px){.cards{gap:16px}.card-label{padding:16px 12px}.card small{font-size:10px;letter-spacing:.05em}.card strong{font-size:28px}.card-copy{font-size:15px}.detail-layout{gap:25px;grid-template-columns:40% 1fr}.curiosity{padding:18px}.activity{padding:25px}.teams{gap:10px}.team{padding:12px}.team-title{gap:5px;font-size:13px}.exercise-layout{gap:20px}.emblem{width:50vw}}
@media(max-width:700px){body{border-inline-width:5px}main{padding:0 16px}.masthead{padding:14px 12px 0}.emblem{width:80vw}.masthead>.eyebrow{font-size:10px}h1{font-size:45px}h1 span{font-size:21px;letter-spacing:.08em}.subtitle{font-size:15px;max-width:360px;margin:10px auto 0}.invitation{font-size:16px;margin:23px auto}.cards{grid-template-columns:1fr;max-width:440px;margin:auto;gap:24px}.card strong{font-size:34px}.card-label{padding:20px}.card small{font-size:11px}.card-copy{font-size:16px}.home-note{font-size:12px;max-width:300px;margin:25px auto}.detail-layout{grid-template-columns:1fr;gap:23px}.visual-column{display:contents}.illustration{order:0}.reading{order:1}.curiosity{order:2;margin:0}.modern-math{order:3;margin:0;padding:18px}.illustration>img{max-height:300px;object-fit:cover}.reading h2{font-size:34px}#topic-text p{font-size:19px}.activity{padding:22px 16px;margin-top:25px;font-size:18px}.activity-heading{align-items:flex-start;flex-direction:column;gap:14px}.activity-heading h3{font-size:29px}.reset{font-size:12px;min-height:44px}.exercise-layout{grid-template-columns:1fr;gap:5px}.square-diagram{width:260px;margin:auto}.choices{gap:9px}.choices button{padding:13px 17px;font-size:17px}.feedback{font-size:17px;padding:15px}.teams{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.team-title{font-size:14px}.block-pool{grid-template-columns:repeat(6,24px);gap:4px}.block-pool .block{width:24px;height:18px}.build-scene{gap:15px;padding:10px 0}.build-scene>svg{width:105px}.build-scene strong{font-size:12px}.topic-nav{gap:5px}.nav-button{font-size:12px;padding:13px 9px}.dots{gap:0}.dots button{width:35px}.dots button::before{inset:15px 11px}.detail-toolbar{font-size:11px}.detail-toolbar .text-button{font-size:13px}footer{padding:16px;flex-direction:column;align-items:flex-start;font-size:11px}.footer-actions{flex-wrap:wrap}.sources{margin-inline:16px;padding:20px}.chart-label{font-size:21px}.chart-value{font-size:23px}.annotation{font-size:12px}}
@media(max-width:370px){h1{font-size:39px}h1 span{font-size:18px}.build-scene{gap:5px}.build-scene>svg{width:83px}.choices button{padding-inline:12px}.nav-button{font-size:11px}.dots button{width:30px}.dots button::before{inset:15px 9px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media print{.masthead{padding:0}.emblem{width:200px}.edge,.footer-actions,.detail-toolbar,.topic-nav,.reset,.skip{display:none!important}body{border:none;background:#fff}main{max-width:none}.activity,.curiosity{break-inside:avoid}footer{padding:10px}.cards{gap:15px}.card{box-shadow:none}.detail-layout{grid-template-columns:35% 1fr;gap:20px}#topic-text p{font-size:14px}.activity{font-size:14px}}