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#e5e1da;padding:24px;display:flex;flex-direction:column;background:#fffdf9}.challenge-label{font-size:10px;letter-spacing:.12em;font-weight:900;color:#7561bc}.challenge-art{height:120px;background:#e5f1ed;border-radius:14px;position:relative;overflow:hidden;margin-top:15px}.challenge-sun{position:absolute;width:42px;height:42px;border-radius:50%;background:#f7c263;right:26px;top:17px}.challenge-block{position:absolute;border-radius:5px;box-shadow:inset 0 -7px #0002}.challenge-block:before,.challenge-block:after{content:"";position:absolute;width:10px;height:6px;border-radius:4px 4px 0 0;background:#ffffff56;top:-5px}.challenge-block:before{left:9px}.challenge-block:after{right:9px}.b1{width:61px;height:35px;background:#ee7857;left:69px;bottom:20px}.b2{width:61px;height:35px;background:#f5bd62;left:69px;bottom:55px}.b3{width:61px;height:35px;background:#5cbabd;left:11px;bottom:20px}.b4{width:61px;height:35px;background:#7964c7;left:128px;bottom:20px}.builder-side h3{font:900 22px var(--display);letter-spacing:-.05em;margin:20px 0 4px}.builder-side p{font-size:13px;line-height:1.5;color:#657189;margin:0}.challenge-button,.download-button{border:1px solid #cfcad8;background:#fff;border-radius:11px;min-height:40px;padding:9px 12px;font-size:12px;font-weight:850;color:var(--ink);display:flex;justify-content:space-between;align-items:center;width:100%;margin-top:18px}.download-button{background:var(--ink);border-color:var(--ink);color:white;margin-top:9px}.challenge-button:hover{border-color:var(--purple)}.download-button:hover{background:#27426f}.builder-side .save-note{font-size:10px;margin-top:auto;padding-top:19px}.closing-section{background:#ffcf74;padding:55px 0}.closing-inner{display:flex;align-items:center;gap:30px}.closing-star{font-size:67px;color:#e86f4d}.closing-inner div{flex:1}.closing-inner h2{font:900 clamp(28px,3.5vw,44px)/1.1 var(--display);letter-spacing:-.07em;margin:8px 0 4px}.closing-inner h2 em{font-style:normal;color:#c75d41}.closing-inner p{margin:0;font-size:15px}.closing-inner .button-primary{box-shadow:0 7px 0 #d7ad62}.site-footer{background:#14284b;color:#fff;padding:34px 0 22px}.footer-inner{display:grid;grid-template-columns:1fr auto;gap:35px;align-items:start}.footer-brand{display:flex;flex-direction:column}.footer-brand strong{font:900 19px var(--display);letter-spacing:-.04em}.footer-brand span{font-size:11px;color:#bac8e0;margin-top:4px}.footer-links{display:flex;gap:24px}.footer-links a{font-size:12px;color:#d4def0;text-decoration:none}.footer-links a:hover{text-decoration:underline}.dedication{grid-column:1/-1;text-align:center;border-top:1px solid #ffffff2d;padding-top:18px;font-size:10px;letter-spacing:.03em;color:#b7c4d8}
@media(max-width:1050px){.site-header{gap:25px}.main-nav{gap:18px}.hero{min-height:auto}.hero-art{height:500px}.rocket{transform:translate(-50%,-50%) rotate(26deg) scale(.85)}.mission-card{padding:23px}.builder-toolbar{flex-wrap:wrap}.tool-actions{margin-left:auto}}
@media(min-width:761px) and (max-width:900px){.hero{display:flex;flex-direction:column;align-items:stretch;gap:24px;padding-block:45px 70px}.hero-copy{padding:0}.hero h1{max-width:740px}.hero-art{width:100%;height:470px}}
@media(max-width:760px){.shell{width:min(100% - 32px,540px)}.site-header{height:auto;min-height:72px;padding:15px 16px;flex-wrap:wrap;gap:15px}.brand{flex:1}.main-nav{order:3;width:100%;justify-content:space-between;gap:10px;border-top:1px solid #e6e1d6;padding-top:12px}.main-nav a{font-size:12px}.header-cta{padding:10px 12px;font-size:11px}.hero{display:flex;flex-direction:column;padding:38px 0 68px;gap:28px}.hero-copy{padding:0}.hero h1{font-size:clamp(48px,10vw,64px);margin:20px 0}.hero-lead{font-size:16px}.hero-note{margin-top:32px}.hero-art{width:100%;height:410px}.hero-planet{transform:scale(.8);transform-origin:bottom right}.sticker-math{font-size:18px}.sticker-curious{font-size:13px}.mission-section,.section-pad{padding:70px 0}.mission-grid{grid-template-columns:1fr}.mission-card{min-height:290px}.mission-icon{height:74px}.section-intro,.space-header{display:block}.section-intro>p,.space-header>p{margin-top:18px}.lab-layout{grid-template-columns:1fr}.lab-sidebar{padding:18px}.topic-list{grid-template-columns:1fr 1fr}.topic-button{padding:8px 6px;gap:8px}.topic-button>span:last-child{display:none}.topic-button small{font-size:9px}.topic-symbol{width:32px;height:32px;font-size:20px}.progress-card{max-width:220px}.space-explorer{grid-template-columns:1fr}.space-scene{min-height:280px}.space-controls{padding:29px}.space-controls>p{min-height:0}.space-fact{margin-top:26px}.space-facts{grid-template-columns:1fr;gap:20px}.space-facts article{padding-top:13px}.builder-content{grid-template-columns:1fr}.builder-side{border-left:0;border-top:1px solid #e5e1da}.builder-toolbar{display:grid;grid-template-columns:1fr 1fr;gap:18px}.tool-actions{grid-column:1/-1;margin:0}.board-wrap{padding:12px}.brick-board{border-width:5px}.closing-inner{flex-wrap:wrap;gap:12px}.closing-star{font-size:44px}.closing-inner .button{margin-left:57px}.footer-inner{grid-template-columns:1fr}.footer-links{flex-wrap:wrap;gap:14px}.dedication{text-align:left}}
@media(max-width:420px){.hero-art{height:350px}.hero-planet{right:8px}.rocket{left:45%;transform:translate(-50%,-50%) rotate(26deg) scale(.72)}.art-sticker{padding:9px 12px}.sticker-curious{bottom:36px}.question-top,.question-bottom{padding-inline:17px}.question-main{padding-inline:16px}.answer-area{padding-inline:17px}.feedback{padding-inline:17px}.model-area{gap:5px}.dot-group{padding:6px;gap:3px;grid-template-columns:repeat(3,9px)}.dot-group i{width:9px;height:9px}.fraction-bar{width:115px}.factorial-model span{width:32px;height:32px}.builder-toolbar{padding:17px}.color-button{height:29px;width:29px}.board-wrap{padding:8px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
[hidden]{display:none!important}
.lesson-card{padding:18px 28px 19px;background:#f8f7f2;border-bottom:1px solid #e7e4db}
.lesson-eyebrow{display:block;font-size:10px;letter-spacing:.13em;font-weight:900;color:#b85f43}
.lesson-card h3{font:900 18px/1.15 var(--display);letter-spacing:-.04em;margin:7px 0 13px}
.lesson-card ol{list-style:none;counter-reset:lesson;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:0;padding:0}
.lesson-card li{counter-increment:lesson;position:relative;padding:10px 10px 10px 31px;background:#fff;border:1px solid #e6e2d8;border-radius:10px;font-size:11px;line-height:1.4;color:#394963}
.lesson-card li:before{content:counter(lesson);position:absolute;left:9px;top:9px;width:16px;height:16px;border-radius:50%;display:grid;place-items:center;background:#ffcf70;color:#5e3e24;font-size:10px;font-weight:900}
.lesson-card p{font-size:11px;font-weight:750;color:#7b5870;margin:10px 0 0}
.question-main>.lesson-eyebrow{margin-bottom:10px}
.reflection{margin:0 28px 14px;padding:11px 13px;border-left:3px solid #f1b65b;border-radius:7px;background:#fff4dc;color:#79562c;font-size:12px;line-height:1.4;font-weight:750}
.space-check{display:grid;grid-template-columns:.8fr 1.2fr;gap:35px;margin-top:48px;padding:28px;border:1px solid #ffffff3b;border-radius:22px;background:#1a315a}
.space-check-intro h3{font:900 26px/1.1 var(--display);letter-spacing:-.05em;margin:12px 0 9px}
.space-check-intro p{font-size:13px;line-height:1.5;color:#cbd7e8;margin:0;max-width:270px}
.space-check-play{border-left:1px solid #ffffff32;padding-left:34px}
.space-check-count{font-size:10px;letter-spacing:.12em;font-weight:900;color:#ffcf7b}
.space-check-play h4{font:900 19px/1.25 var(--display);margin:10px 0 16px}
.space-check-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}
.space-check-options button{border:1px solid #7893b8;border-radius:10px;background:#25416d;color:#fff;min-height:50px;padding:9px 11px;text-align:left;font-size:12px;font-weight:800}
.space-check-options button:hover:not(:disabled){background:#355785;border-color:#b0c9e9}
.space-check-options button.correct{background:#2d775f;border-color:#8de1bc}
.space-check-options button.incorrect{background:#874d56;border-color:#eaa3a5}
.space-check-feedback{min-height:19px;font-size:12px;line-height:1.45;font-weight:750;color:#b9efd5;margin:12px 0 0}
.space-check-feedback.error{color:#ffd0c8}
.space-check-next{border:0;background:#ffcf70;color:#14284b;padding:9px 13px;border-radius:9px;font-size:12px;font-weight:900;margin-top:13px}
.space-check-next:hover{background:#ffe09a}
.challenge-kind{display:inline-block;color:#7a61b9;font-size:10px;letter-spacing:.1em;font-weight:900;margin:12px 0 6px}
.builder-side .challenge-reflection{margin-top:10px;padding:9px 10px;background:#f2ede2;border-radius:9px;color:#4e5a6b;font-weight:700}
.builder-side .brick-count{margin-top:14px;font-size:11px;font-weight:800;color:#4f6079}
.brick-count strong{font:900 16px var(--display);color:#14284b}
@media(max-width:760px){.lesson-card{padding:17px 18px}.lesson-card ol{grid-template-columns:1fr}.lesson-card li{font-size:12px}.reflection{margin-inline:17px}.space-check{grid-template-columns:1fr;gap:18px;padding:22px}.space-check-play{border-left:0;border-top:1px solid #ffffff32;padding:20px 0 0}}
@media(max-width:420px){.space-check-options{grid-template-columns:1fr}}
.lesson-card ol{list-style:decimal;padding-left:22px}
.lesson-card li{padding:10px}
.lesson-card li::marker{color:#a65339;font-weight:900}
.lesson-card li:before{content:none}
@media(max-width:420px){.topic-list{grid-template-columns:1fr}.topic-button{min-height:56px;padding:8px 10px}.topic-symbol{width:36px;height:36px}.topic-button small{font-size:11px}.lesson-card li{font-size:13px}}