/* SimpleSci v5.8.28 — brand presentation, not simulation geometry. */
:root{--ss-ink:#142f3e;--ss-teal:#137b83;--ss-deep:#123e44;--ss-mint:#eaf5f0;--ss-paper:#fbfaf6;--ss-yellow:#f5cf62;--ss-muted:#506874;--ss-line:#d8e4e3;--blue:#137b83;--navy:#142f3e;--yellow:#f5cf62;--bg:#fbfaf6;--text:#142f3e;--muted:#506874;--line:#d8e4e3}
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.ss-header{padding:14px max(24px,calc((100vw - 1300px)/2));gap:25px;min-height:78px;border-bottom:1px solid var(--ss-line);background:#fff}
.ss-brand{font-size:26px;letter-spacing:-1.1px;gap:9px;line-height:1;white-space:nowrap;flex-shrink:0}.ss-brand .ss-wordmark{display:inline;font-weight:850;color:var(--ss-ink)}.ss-wordmark>span,.ss-footer-brand>span{color:var(--ss-teal)}.ss-mark{width:36px;height:36px;display:inline-grid;place-items:center;border-radius:11px;color:var(--ss-yellow);background:var(--ss-deep);font-size:25px;letter-spacing:0;line-height:1}
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#explore,#engineer-challenges,#quiz,#topics,#available-labs,#about,#grown-ups,#progress{scroll-margin-top:125px}
.ss-eyebrow{font-size:11px;letter-spacing:.13em;text-transform:uppercase;font-weight:800;color:var(--ss-teal);margin:0 0 16px;line-height:1.5}
.ss-hero{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);align-items:center;gap:66px;max-width:1300px;padding:65px 28px 59px;margin:0 auto}.ss-hero-copy h1{font-size:clamp(48px,5.4vw,80px);line-height:1.025;letter-spacing:-.055em;margin:10px 0 25px;font-weight:850;color:var(--ss-ink)}.ss-hero-copy h1>span{color:var(--ss-teal)}.ss-hero-question{font-size:20px;line-height:1.5;max-width:570px;font-weight:650;margin:0 0 15px}.ss-hero-description{font-size:16px;color:var(--ss-muted);line-height:1.75;max-width:570px;margin:0}
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.ss-discovery{padding:27px 25px 21px;background:var(--ss-mint);border:1px solid #d5e7dc;border-radius:24px;box-shadow:0 12px 0 #e0ece566;transform:rotate(-.6deg)}.ss-discovery-heading{padding:0 3px 18px}.ss-pill{display:inline-block;font-size:9px;letter-spacing:.08em;font-weight:850;padding:6px 9px;border-radius:6px;background:#f8e6a9;color:#4f481f;line-height:1.5}.ss-discovery h2{font-size:24px;letter-spacing:-.035em;font-weight:800;line-height:1.25;margin:13px 0 0;max-width:300px}.ss-feature-link{display:grid;grid-template-columns:49px minmax(0,1fr) 21px;gap:12px;align-items:center;text-decoration:none;color:var(--ss-ink);background:white;border:1px solid #d7e4de;border-radius:14px;padding:17px 13px;margin:10px 0;transition:transform .18s,border-color .18s}.ss-feature-link:hover{border-color:var(--ss-teal);transform:translateX(3px)}.ss-feature-icon{font-size:30px;display:grid;place-items:center;width:47px;height:48px;background:#f4f8f3;border-radius:11px}.ss-feature-link strong{display:block;font-size:14px;font-weight:800;line-height:1.35}.ss-feature-link small{display:block;font-size:11.5px;color:var(--ss-muted);line-height:1.6;margin-top:4px}.ss-feature-arrow{font-size:23px;color:var(--ss-teal)}.ss-discovery-foot{font-size:11px;font-weight:600;text-align:center;color:#536d66;margin:18px 0 2px}
.ss-brand-promise{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));max-width:1244px;margin:0 auto 46px;border-top:1px solid var(--ss-line);border-bottom:1px solid var(--ss-line);padding:25px 0}.ss-brand-promise>div{display:grid;grid-template-columns:37px 1fr;gap:2px 12px;padding:0 26px;border-right:1px solid var(--ss-line)}.ss-brand-promise>div:last-child{border-right:0}.ss-number{grid-row:1/3;font-size:12px;color:var(--ss-teal);background:#e6f2ee;display:grid;place-items:center;width:32px;height:32px;border-radius:50%;font-weight:750;align-self:center}.ss-brand-promise h2{font-size:19px;line-height:1.4;margin:0;letter-spacing:-.025em}.ss-brand-promise p{font-size:12px;color:var(--ss-muted);margin:2px 0 0;line-height:1.5}
.wh-journey{max-width:1244px;margin:25px auto 32px;background:white;border:1px solid var(--ss-line);padding:28px 30px;gap:35px;box-shadow:none}.wh-journey h2{font-size:26px;letter-spacing:-.035em;color:var(--ss-ink);line-height:1.25}.wh-journey p{color:var(--ss-muted);font-size:14px;line-height:1.7}.wh-journey .eyebrow{font-size:10px;color:var(--ss-teal)}.wh-journey .wh-journey-count{font-size:15px;color:var(--ss-teal)!important}.wh-journey-links a{border-color:var(--ss-line);background:#f7faf7}.wh-journey-links a:hover{border-color:var(--ss-teal)}.wh-journey-links a b{font-size:12px}
.progress-dashboard{max-width:1244px;margin:0 auto;background:#f0f5f1;border:1px solid var(--ss-line);padding:24px 30px;border-radius:18px}.progress-dashboard h2{font-size:22px;letter-spacing:-.025em;line-height:1.3}.progress-dashboard p{font-size:13px;color:var(--ss-muted)}.progress-dashboard .eyebrow{font-size:10px;color:var(--ss-teal)}.progress-ring{width:72px;height:72px;font-size:14px}.reset-button{background:transparent;font-size:12px}
.topics-section{padding:48px 28px 34px;max-width:1300px;margin:0 auto}.section-heading h2{font-size:29px;letter-spacing:-.03em;line-height:1.25}.section-heading p{font-size:14px;line-height:1.6}.filters{gap:6px}.filter{font-size:12px;padding:8px 12px}.filter.active{background:var(--ss-deep)}.topic-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.topic-card{border-radius:18px;padding:14px;border-color:var(--ss-line);box-shadow:0 4px 15px #213d3610}.topic-card:hover{box-shadow:0 9px 25px #213d3619;transform:translateY(-3px)}.card-art{height:138px;background:linear-gradient(135deg,#edf6f0,#deede8)}.card-art>span{font-size:56px}.motion-ring{border-color:#4a99904d}.topic-card h3{font-size:20px;letter-spacing:-.025em;line-height:1.3;margin:12px 2px 6px}.topic-card p{font-size:13px;line-height:1.65;margin:5px 2px 14px;color:var(--ss-muted)}.topic-card>span{font-size:11px;color:#4d7274}.card-topline small{font-size:10px}.topic-card .flagship-label{background:#e9f5f0;color:#19685f;font-size:9px;padding:5px 8px;margin-top:11px;align-self:flex-start}.topic-card.flagship-card{outline:none;border-top:3px solid #499d90}
.ss-about{max-width:1244px;margin:38px auto 0;padding:43px 38px;display:grid;grid-template-columns:1fr 1fr;gap:50px;background:var(--ss-deep);border-radius:24px;color:#fff}.ss-about .ss-eyebrow{color:#a4dad0}.ss-about h2{color:#fff;font-size:33px;letter-spacing:-.04em;line-height:1.25;margin:0}.ss-about p:not(.ss-eyebrow){font-size:14px;line-height:1.85;margin:0 0 13px;color:#d1e6e5}.ss-about .ss-about-closing{margin:18px 0 0!important;color:#f9dfa0!important}.ss-about strong{font-size:16px;color:#fff1c8}
.ss-grownups{max-width:1244px;margin:56px auto 45px;padding:0 10px}.ss-grownups-heading{max-width:680px;margin-bottom:27px}.ss-grownups-heading h2{font-size:36px;line-height:1.15;letter-spacing:-.04em;margin:0 0 15px}.ss-grownups-heading>p:last-child{font-size:15px;line-height:1.7;color:var(--ss-muted)}.ss-grownup-cards{display:grid;grid-template-columns:1fr 1fr;gap:22px}.ss-grownup-cards article{background:white;border:1px solid var(--ss-line);border-radius:18px;padding:27px 28px}.ss-grownup-cards .ss-pill{background:var(--ss-mint);color:#286b61}.ss-grownup-cards h3{font-size:22px;line-height:1.35;letter-spacing:-.025em;margin:15px 0 12px}.ss-grownup-cards p{font-size:14px;line-height:1.75;color:var(--ss-muted)}.ss-grownup-cards a{display:inline-block;color:var(--ss-teal);font-weight:750;text-decoration:none;font-size:13px;margin-top:9px}.ss-grownup-cards a:hover{text-decoration:underline}.ss-adult-note{font-size:12px;line-height:1.75;color:var(--ss-muted);margin:21px 3px 0;max-width:950px}
.ss-footer{display:grid;grid-template-columns:1fr auto 1fr;gap:38px;text-align:left;padding:36px max(28px,calc((100vw - 1244px)/2));background:#edf3ef;border-top:1px solid var(--ss-line);color:var(--ss-ink);align-items:start;margin-top:45px}.ss-footer-brand{font-size:25px;font-weight:850;letter-spacing:-1px;text-decoration:none;color:var(--ss-ink)}.ss-footer p{font-size:13px;margin:4px 0;color:var(--ss-ink);line-height:1.6}.ss-footer p.ss-small{font-size:11px;color:var(--ss-muted)}.ss-footer nav{display:grid;gap:10px;padding-top:6px}.ss-footer nav a{font-size:12px;text-decoration:none;color:var(--ss-deep);font-weight:650}.ss-footer nav a:hover{text-decoration:underline}.ss-footer .ss-footer-trust{font-size:12px;color:var(--ss-muted);text-align:right;padding-top:6px}
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.wh-lab{border-color:#c9dedb;scroll-margin-top:130px}.wh-head{background:linear-gradient(115deg,#eaf5ef,#fbf4dd)}.wh-kicker{color:var(--ss-teal);letter-spacing:.095em;max-width:610px;line-height:1.65}.wh-lab .wh-head h2{color:var(--ss-ink)}.wh-lab .wh-go{background:var(--ss-deep);border-color:var(--ss-deep)}.wh-lab .wh-go[aria-pressed=true]{background:var(--ss-teal)}.wh-mission-heading h3{font-size:17px!important}.quiz-card{border-color:var(--ss-line);box-shadow:0 5px 20px #2240390a}.quiz-card .primary{background:var(--ss-deep);color:#fff}.quiz-card .eyebrow{color:var(--ss-teal)}.quiz-question input{accent-color:var(--ss-teal)}.engineer-card{background:linear-gradient(120deg,#123e44,#1d5760)}.complete-card{background:var(--ss-deep)}.next-mysteries{background:#173f46}.next-mystery-card{background:#21545a;border-color:#568387}.next-mystery-card:hover{background:#2a666c}
.upcoming-shell{max-width:1050px}.upcoming-hero{background:linear-gradient(130deg,#f0f8f2,#fffaf0);border-color:var(--ss-line)}.upcoming-hero h1{letter-spacing:-.04em;line-height:1.15}.upcoming-hero>.primary{background:var(--ss-deep);color:#fff}.upcoming-notice{color:var(--ss-muted)}.ready-topic{border-color:var(--ss-line)}.ready-topic:hover{border-color:var(--ss-teal)}
@media(max-width:1150px){.ss-header{gap:18px;padding:13px 24px}.ss-header nav{display:flex;gap:15px;font-size:12px}.ss-header .search{width:220px}.ss-hero{gap:35px;padding:50px 28px}.ss-hero-copy h1{font-size:62px}.ss-hero-question{font-size:18px}.ss-discovery{padding:22px 17px}.ss-brand-promise,.wh-journey,.progress-dashboard,.ss-about{margin-left:28px;margin-right:28px}.ss-grownups{margin-left:28px;margin-right:28px}.ss-about{gap:30px}.ss-about h2{font-size:30px}.ss-feature-link{padding:15px 10px;gap:9px}}
@media(max-width:900px){.ss-header{flex-wrap:wrap;gap:12px 20px;padding:12px 20px}.ss-header nav{order:3;flex-basis:100%;justify-content:flex-start;margin:0;gap:22px;font-size:12px}.ss-header .search{margin-left:auto;width:250px}.ss-header .lesson-progress{margin-left:auto}.ss-hero{grid-template-columns:minmax(0,1fr) minmax(0,.95fr);gap:25px;padding-top:38px}.ss-hero-copy h1{font-size:51px}.ss-feature-icon{width:37px;height:40px;font-size:25px}.ss-feature-link{grid-template-columns:37px minmax(0,1fr) 18px;gap:8px}.ss-discovery h2{font-size:22px}.ss-feature-link strong{font-size:13px}.ss-feature-link small{font-size:11px}.ss-brand-promise>div{padding:0 15px;gap:2px 8px}.ss-brand-promise h2{font-size:17px}.ss-brand-promise p{font-size:11px}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.wh-journey{grid-template-columns:1fr;gap:18px}.wh-journey-links{grid-template-columns:repeat(6,minmax(0,1fr))}.wh-journey-links a b{font-size:11px}.wh-journey-links a small{font-size:9px}.ss-about{grid-template-columns:1fr;gap:20px}.ss-about h2 br{display:none}.ss-footer{grid-template-columns:1fr 1fr;gap:22px}.ss-footer .ss-footer-trust{grid-column:1/-1;text-align:left}}
@media(max-width:650px){.ss-header{padding:12px 16px;gap:13px}.ss-brand{font-size:24px}.ss-mark{width:32px;height:32px;font-size:23px}.ss-header .search{width:155px;font-size:11px;padding:10px 9px}.ss-header .search::placeholder{color:#597079}.ss-header nav{gap:19px;font-size:11px;justify-content:space-between}.ss-header .lesson-progress{width:85px}.ss-hero{grid-template-columns:1fr;padding:38px 19px 35px;gap:31px}.ss-hero-copy h1{font-size:60px;margin:11px 0 20px}.ss-hero-question{font-size:18px;line-height:1.55}.ss-hero-description{font-size:14px;line-height:1.8}.ss-eyebrow{font-size:10px;margin-bottom:12px}.ss-hero-actions{gap:9px;margin-top:23px}.ss-hero-actions .button{font-size:12px;padding:11px 14px;min-height:46px;gap:12px}.ss-trust-line{font-size:10px;gap:7px 13px}.ss-discovery{transform:none;padding:22px 19px;box-shadow:none;border-radius:20px}.ss-discovery h2{font-size:26px;max-width:none}.ss-feature-link{grid-template-columns:45px 1fr 19px;padding:15px 12px;gap:10px}.ss-feature-icon{width:43px;height:47px;font-size:28px}.ss-feature-link strong{font-size:14px}.ss-feature-link small{font-size:11.5px}.ss-brand-promise{margin:0 19px 25px;padding:21px 0;gap:18px;grid-template-columns:1fr}.ss-brand-promise>div{border-right:0;padding:0 6px;grid-template-columns:35px 1fr;gap:0 10px}.ss-brand-promise h2{font-size:19px}.ss-brand-promise p{font-size:12px}.wh-journey{margin:24px 16px;padding:22px 19px;border-radius:18px}.wh-journey h2{font-size:25px}.wh-journey p{font-size:13px}.wh-journey-links{grid-template-columns:repeat(3,minmax(0,1fr));gap:7px}.wh-journey-links a b{font-size:11px}.wh-journey-links a small{font-size:9px}.progress-dashboard{margin:0 16px;padding:22px 19px;gap:14px;grid-template-columns:minmax(0,1fr) auto}.progress-dashboard h2{font-size:20px}.progress-ring{width:64px;height:64px}.topics-section{padding:36px 16px 16px}.section-heading h2{font-size:27px}.section-heading p{font-size:13px}.topic-grid{grid-template-columns:1fr;gap:15px}.topic-card{padding:15px}.topic-card h3{font-size:22px}.topic-card p{font-size:14px}.card-art{height:135px}.card-art>span{font-size:60px}.card-topline small{font-size:11px}.ss-about{margin:28px 16px 0;padding:29px 24px;border-radius:20px;gap:22px}.ss-about h2{font-size:29px}.ss-about p:not(.ss-eyebrow){font-size:13px}.ss-grownups{margin:39px 16px 25px;padding:0}.ss-grownups-heading h2{font-size:32px}.ss-grownups-heading>p:last-child{font-size:14px}.ss-grownup-cards{grid-template-columns:1fr;gap:14px}.ss-grownup-cards article{padding:24px}.ss-grownup-cards h3{font-size:21px}.ss-grownup-cards p{font-size:13px}.ss-adult-note{font-size:11px}.ss-footer{padding:30px 22px;gap:24px;margin-top:35px}.ss-footer p{font-size:12px}.ss-footer nav a{font-size:11px}.ss-footer-brand{font-size:24px}.ss-footer .ss-footer-trust{font-size:11px}.article-shell{padding:26px 16px 40px}.article-hero{padding-top:23px}.article-hero h1{font-size:39px;line-height:1.08}.article-hero .dek,.article-hero .lesson-lead{font-size:16px}.article-title-row{gap:13px}.lesson-icon{font-size:38px}.meta{font-size:10px;gap:9px}.ss-learning-path{padding:10px 0;gap:2px;justify-content:space-between}.ss-learning-path a{font-size:11px;gap:5px;padding:5px 3px;white-space:nowrap}.ss-learning-path a>span{width:23px;height:23px;font-size:10px}.wh-kicker{font-size:9px;line-height:1.8}.wh-mission-heading h3{font-size:16px!important}.wh-journey-count{font-size:14px!important}.upcoming-shell{padding:28px 16px}.upcoming-hero{padding:30px 21px}.upcoming-hero h1{font-size:35px}.upcoming-hero .upcoming-teaser{font-size:15px}}
@media(max-width:360px){.ss-header .search{width:130px}.ss-header nav{gap:8px;font-size:10px}.ss-hero-copy h1{font-size:52px}.ss-hero-actions .button{padding:10px 12px;font-size:11px}.ss-trust-line{gap:6px 10px}.ss-feature-link strong{font-size:13px}.ss-feature-link small{font-size:11px}.ss-footer{grid-template-columns:1fr}.ss-footer .ss-footer-trust{grid-column:auto}.article-hero h1{font-size:35px}}
@media(prefers-reduced-motion:reduce){.ss-feature-link,.topic-card{transition:none}.ss-feature-link:hover,.topic-card:hover{transform:none}}
/* Keep the primary promise on two clear lines on smaller screens. */
@media(max-width:650px){.ss-hero-copy h1{font-size:clamp(41px,12vw,60px)}.ss-hero-copy h1>span{white-space:nowrap}}


/* v5.8.49 homepage cleanup: one clear route into lessons */
body:not([data-topic-page]) .ss-hero{grid-template-columns:minmax(0,1fr);max-width:1040px;gap:0;padding-top:58px;padding-bottom:48px}
body:not([data-topic-page]) .ss-hero-copy{max-width:760px}
body:not([data-topic-page]) .ss-hero-copy .ss-hero-description{max-width:680px}
body:not([data-topic-page]) .ss-hero-actions{margin-bottom:18px}
body:not([data-topic-page]) .topics-section{padding-top:34px}
body:not([data-topic-page]) .progress-dashboard{margin-top:18px;margin-bottom:38px}
@media(max-width:650px){body:not([data-topic-page]) .ss-hero{padding-top:34px;padding-bottom:28px}}

/* v5.8.56 homepage curiosity tagline */
@media(max-width:650px){.ss-hero-copy h1>span{white-space:normal}}

.engineer-card .career-invite{margin-top:16px!important;color:#fff;font-size:1.55rem;line-height:1.3;letter-spacing:-.015em}

@media(max-width:650px){.engineer-card .career-invite{font-size:1.35rem;line-height:1.32}}