:root{--ink:#142c38;--muted:#526772;--mint:#a3e6cf;--purple:#c7baff;--gold:#ffe09b}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fafbf8;color:var(--ink);font:16px/1.65 system-ui,sans-serif}a{color:#175c59;text-decoration:none}button,input,select{font:inherit}button,.button{display:inline-flex;align-items:center;justify-content:center;gap:12px;padding:12px 19px;border:1px solid #175c59;border-radius:10px;min-height:46px;background:#175c59;color:white;font-size:14px;font-weight:700;cursor:pointer}button.secondary,.button.secondary{background:transparent;color:#175c59}.container{max-width:1200px;padding:0 28px;margin:auto}.topbar{display:flex;align-items:center;justify-content:space-between;gap:28px;padding-top:22px;padding-bottom:22px;border-bottom:1px solid #d5e0db}.brand{font-weight:850;letter-spacing:.1em;font-size:13px}.topbar nav{display:flex;align-items:center;gap:24px;flex-wrap:wrap;font-size:13px}.topbar [aria-current=page]{font-weight:800;text-decoration:underline;text-underline-offset:7px}.hero{padding-top:70px;padding-bottom:55px;display:grid;grid-template-columns:1.5fr 1fr;gap:55px;align-items:center}.eyebrow{text-transform:uppercase;letter-spacing:.16em;font-weight:800;font-size:11px;color:#26756a}h1{font-size:clamp(38px,5vw,65px);line-height:1.08;letter-spacing:-.05em;margin:16px 0 25px}h1 em{font:italic 1em Georgia,serif;color:#26756a}h2{font-size:clamp(26px,3vw,38px);line-height:1.2;letter-spacing:-.03em}h3{font-size:22px;line-height:1.25}p{color:var(--muted)}.lead{font-size:18px;max-width:700px}.hero-art{height:330px;border-radius:26px;background:#122b3b;position:relative;overflow:hidden;display:grid;place-items:center}.hero-art svg{width:90%;height:90%}.actions{display:flex;align-items:center;gap:15px;flex-wrap:wrap;margin-top:24px}.note{font-size:12px}.strip{border-top:1px solid #d5e0db;border-bottom:1px solid #d5e0db;padding:17px 0;display:flex;gap:24px;flex-wrap:wrap;font-size:13px;color:#526772}.section{padding:48px 0}.demo-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.panel,.topic-card{padding:27px;border:1px solid #d5e0db;border-radius:20px;background:white}.panel label{display:block;font-size:13px;font-weight:650;margin:15px 0 6px}.panel input,.panel select{width:100%;border:1px solid #bdcfc7;background:#fff;color:#142c38;padding:10px;border-radius:8px;min-height:44px}.result{background:#edf3ef;border:1px solid #ceded5;border-radius:12px;padding:17px;margin:18px 0;color:#174941;min-height:110px}.result strong{display:block;font-size:21px}.result small{display:block;color:#526772}.report-table{width:100%;font-size:13px;border-collapse:collapse}.report-table th,.report-table td{padding:9px 3px;text-align:left;border-bottom:1px solid #d5e0db}.room{padding:20px;background:#173548;border-radius:14px;color:#fff;margin-top:20px;transition:background .2s}.room.lit{background:#d8bb6c;color:#302511}.room p{color:inherit}.room-icon{font-size:44px}.checks{display:flex;gap:12px;flex-wrap:wrap}.checks button{font-size:12px;padding:10px}.callout{display:flex;justify-content:space-between;align-items:center;gap:30px;background:#142f3b;border-radius:24px;padding:34px;color:white}.callout p{color:#c2d4d8}.callout .button{background:var(--mint);color:#12352f;border-color:var(--mint);white-space:nowrap}.footer{padding-top:30px;padding-bottom:32px;border-top:1px solid #d5e0db;display:flex;justify-content:space-between;gap:25px;flex-wrap:wrap;font-size:13px}.science{background:radial-gradient(ellipse at top right,#303459,transparent 50%),#0c1422;color:#f4f6fa}.science p{color:#b4c4d2}.science a{color:var(--mint)}.science .eyebrow{color:var(--mint)}.science h1 em{color:var(--purple)}.science .topbar,.science .strip,.science .footer{border-color:#ffffff20}.science .strip{color:#b4c4d2}.science .button{background:var(--mint);color:#12352f;border-color:var(--mint)}.science .topic-card{background:#172337;border-color:#ffffff20;display:flex;flex-direction:column;padding:0;overflow:hidden}.topic-card .illustration{height:210px;display:grid;place-items:center;background:radial-gradient(circle at 50% 40%,#38556d,transparent 80%),#132039}.illustration svg{width:90%;height:90%}.topic-body{padding:25px;flex:1;display:flex;flex-direction:column}.topic-body h2{font-size:27px;margin:12px 0}.topic-body .button{align-self:start;margin-top:auto}.topics{display:grid;grid-template-columns:repeat(3,1fr);gap:23px}.filter-bar{display:flex;gap:9px;flex-wrap:wrap;margin:25px 0}.filter-bar button{background:transparent;border-color:#5b6680;color:#d0d9eb}.filter-bar button[aria-pressed=true]{background:var(--mint);color:#12352f;border-color:var(--mint)}[hidden]{display:none!important}.reading{max-width:880px;margin:auto;padding:35px 28px 65px}.reading h1{font-size:clamp(35px,5vw,55px)}.reading h2{font-size:28px;margin-top:32px}.reading p{line-height:1.85}.video-wrap{aspect-ratio:16/9;border:1px solid #536079;border-radius:18px;overflow:hidden;background:#132039}.video-wrap iframe{border:0;width:100%;height:100%}.source-box{padding:23px;background:#172337;border:1px solid #455069;border-radius:16px;margin:30px 0;font-size:14px}.source-box a{text-decoration:underline;overflow-wrap:anywhere}.share-bar{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:28px}.share-bar button{background:transparent;border-color:#62728c;color:var(--mint)}.quiz{background:#172337;border:1px solid #455069;border-radius:16px;padding:24px;margin:30px 0}.quiz button{margin:5px;background:#253e50;border-color:#62728c;color:white}.quiz [role=status]{min-height:55px;margin-top:15px}.tag{display:inline-block;font-size:11px;text-transform:uppercase;letter-spacing:.1em;border:1px solid #64718c;border-radius:30px;padding:5px 11px;color:var(--mint)}:focus-visible{outline:3px solid var(--gold);outline-offset:4px}@media(max-width:950px){.topbar{align-items:start;flex-direction:column;gap:16px}.topbar nav{gap:15px}.hero{grid-template-columns:1fr;gap:20px;padding-top:42px}.hero-art{height:230px}.demo-grid,.topics{grid-template-columns:1fr}.panel{padding:24px}.callout{flex-direction:column;align-items:start}.topic-card .illustration{height:240px}.topics{max-width:660px;margin:auto}}@media(max-width:540px){.container{padding-left:20px;padding-right:20px}.hero{padding-top:35px;padding-bottom:30px}.hero-art{height:190px}.lead{font-size:16px}.section{padding:32px 0}.callout{padding:24px}.topbar nav{gap:12px;font-size:12px}.reading{padding:24px 20px 45px}.strip{font-size:12px;gap:12px}.callout .button{white-space:normal}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}