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0}.modal-body>.text-button{display:block}.tutor-context>strong{font-size:13px;display:block}.tutor-context blockquote{font-size:12px;max-height:110px;overflow:auto}.tutor-answer{background:var(--bg);padding:18px 20px;border-radius:10px;border:1px solid var(--line);margin:20px 0}.answer-badge{text-transform:uppercase;font-size:9px;letter-spacing:.08em;color:var(--green);background:var(--green-soft);padding:4px 7px;border-radius:4px}.answer-badge.generated{background:#ebe5fa;color:#665479}.tutor-answer p{white-space:pre-wrap;font-size:14px;line-height:1.9;margin:12px 0}.tutor-answer a{display:block;font-size:11px;text-decoration:underline;color:var(--green);margin:10px 0}.tutor-answer small{display:block;font-size:10px;line-height:1.6;color:var(--muted)}.question-chips{display:flex;gap:8px;flex-wrap:wrap}.question-chips button{border:1px solid var(--line);border-radius:20px;padding:8px 13px;font-size:11px}.tutor-context .eyebrow{font-size:9px}.modal-body>.button-row{margin-top:17px}.figure-zoom{overflow:auto;max-height:65dvh;background:white;border-radius:6px}.figure-zoom img{width:1050px;max-width:none;display:block;height:auto}.selection-toolbar{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);z-index:31;display:flex;align-items:center;gap:2px;background:#263e30;color:#fff;padding:8px 10px;border-radius:12px;box-shadow:0 7px 35px #14231840;max-width:calc(100vw - 20px)}.selection-toolbar button{font-size:11px;padding:10px;min-height:40px;white-space:nowrap;border-radius:6px;color:#fff}.selection-toolbar button:hover{background:#43624b}.selection-label{font-size:9px;opacity:.6;padding:0 8px;white-space:nowrap}.toast{position:fixed;bottom:85px;left:50%;transform:translateX(-50%);background:#253c2e;color:#fff;padding:13px 22px;border-radius:10px;font-size:12px;line-height:1.7;max-width:min(620px,90vw);width:max-content;z-index:70;box-shadow:0 8px 25px #162a2420;text-align:center}.error{padding:15px;background:#f9e8df;color:#7e3932;border:1px solid #e3b3a5;border-radius:7px;font-size:12px;line-height:1.8;margin:14px 0;overflow-wrap:anywhere}.error p{font-size:12px}.error button{font-size:11px;text-decoration:underline;margin-right:13px}.report-list{display:grid;gap:13px;margin-top:20px}.report-list strong{display:block;font-size:11px;overflow-wrap:anywhere}.report-list .note-card p{font-size:13px}.report-list select{font-size:12px;margin-top:10px}[data-theme=dark]{--bg:#1e2822;--surface:#27322b;--ink:#e7eadd;--muted:#a6b5a5;--line:#3b483c;--green:#8dae8a;--green-soft:#344934;--yellow:#9b8a39;color-scheme:dark}[data-theme=dark] .button.primary{background:#92ad86;color:#18211b}[data-theme=dark] .foundation-band,[data-theme=dark] .included-card,[data-theme=dark] .notice,[data-theme=dark] .prerequisite-strip,[data-theme=dark] .demo-strip,[data-theme=dark] .paywall{background:#2d3828}[data-theme=dark] .hero-copy h1 span,[data-theme=dark] .subject-detail h1>span{color:#9bb596}[data-theme=dark] .role-physical-analogy,[data-theme=dark] .demo-card{background:#353b28}[data-theme=dark] .tutor-answer p{color:var(--ink)}[data-theme=dark] .network-art,[data-theme=dark] .planned-art{filter:brightness(.8)}[data-theme=dark] .plot{background:#f8f8f3;border-radius:7px}[data-theme=dark] blockquote{background:#46422a;color:#e5dfbf}
@media(min-width:1500px){.hero{padding-top:90px;padding-bottom:90px}.hero-copy h1{font-size:65px}.reader-layout{gap:45px}}
@media(max-width:1250px){.reader-layout{grid-template-columns:220px minmax(0,720px);gap:30px;max-width:1070px}.reader-tools{display:none}.hero{gap:35px}.hero-copy h1{font-size:53px}.section-heading>span{white-space:normal;max-width:160px}.subject-detail-grid{gap:45px}.subject-facts{gap:15px}.subject-card-body{padding:20px}.card-meta{font-size:8px}}
@media(max-width:900px){.page-width{padding-left:26px;padding-right:26px}.header-inner{padding:0 26px}.hero{gap:27px;padding-top:45px}.hero-copy h1{font-size:45px}.hero-description{font-size:14px}.hero-buttons{gap:13px}.hero-promises{font-size:9px;gap:13px}.hero .button{font-size:11px;padding:10px 14px}.hero .text-button{font-size:11px}.subject-grid{grid-template-columns:1fr 1fr}.subject-grid .planned:last-child{display:none}.how-grid{gap:25px}.subject-detail h1{font-size:60px}.subject-detail-grid{gap:30px;grid-template-columns:1.3fr 1fr}.included-card{padding:25px}.reader-layout{grid-template-columns:180px minmax(0,1fr);padding:0 20px;gap:24px}.reader-main h1{font-size:35px}.outline{padding-right:15px}.outline nav a{font-size:10px}.outline h4{font-size:7px}.article-content{font-size:calc(var(--reader-font) - 1px)}.library-grid{grid-template-columns:1fr 1.1fr;gap:22px}.library-tools .button{width:100%}.modal-header{padding:16px 22px}.modal-body{padding:22px}.section-heading{align-items:start}.section-heading h2{font-size:26px}}
@media(max-width:680px){body{padding-bottom:69px}.page-width{padding-left:22px;padding-right:22px}.header-inner{height:65px;padding:0 21px}.logo{font-size:21px}.brand-mark{width:29px;height:33px;font-size:25px;border-radius:8px}.desktop-nav{display:none}.header-actions{gap:9px}.header-actions .button{min-height:35px;padding:6px 12px;font-size:11px}.demo-strip{font-size:8px;line-height:1.6;padding:5px 14px}.demo-strip span{font-size:8px}.hero{grid-template-columns:1fr;gap:37px;padding-top:37px;padding-bottom:38px}.hero-copy h1{font-size:45px;line-height:1.08;letter-spacing:-.05em;margin-top:18px;margin-bottom:20px}.desktop-break{display:none}.hero-description{font-size:14px;line-height:1.85;max-width:400px}.hero .eyebrow{font-size:9px}.hero-buttons{margin-top:24px;gap:17px}.hero .button{font-size:12px;min-height:44px}.hero .text-button{font-size:11px}.hero-promises{font-size:9px;margin-top:19px}.hero-demo{padding-top:8px}.sticky-note{font-size:10px;top:-14px;right:13px;padding:8px 15px}.hero-demo-caption{font-size:9px}.playground.compact{padding:20px 18px 16px}.playground-heading h3{font-size:20px}.chart-kind{font-size:8px;padding:4px 7px}.playground.compact .plot{height:220px}.foundation-band{padding:27px 0}.foundation-band>.page-width{display:block}.foundation-band h2{font-size:25px;margin-bottom:18px}.foundation-band p{font-size:12px}.foundation-band a{font-size:11px;margin-top:15px}.foundation-band .eyebrow{font-size:8px;line-height:1.9}.subject-section{padding-top:38px}.section-heading{display:block;margin-bottom:23px}.section-heading h2{font-size:26px;margin-bottom:13px}.section-heading>.muted{font-size:10px}.subject-grid{grid-template-columns:1fr;gap:22px}.subject-grid .planned:last-child{display:block}.subject-art,.planned-art{height:180px}.subject-card-body{padding:23px}.subject-card h3{font-size:26px}.subject-card p{font-size:13px}.subject-card .card-meta{font-size:9px}.subject-card.planned 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a{font-size:9px;color:var(--muted);min-width:64px;text-align:center;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;height:58px}.mobile-nav a>span{font-size:21px;line-height:1.2;font-family:system-ui,sans-serif}.mobile-nav a.active{color:var(--green);font-weight:650}.mobile-nav a.active>span{background:var(--green-soft);border-radius:20px;width:46px}.subject-detail{padding-top:37px;padding-bottom:35px}.subject-detail>.eyebrow{font-size:8px}.subject-detail-grid{grid-template-columns:1fr;gap:20px;margin:25px 0 35px}.subject-detail h1{font-size:62px;line-height:1.02;margin-bottom:20px}.subject-detail .lead{font-size:15px}.subject-facts{gap:15px;justify-content:space-between;padding:15px 0}.subject-facts span{font-size:8px;max-width:29%;line-height:1.7;display:block}.subject-facts b{font-size:23px;display:block}.subject-detail .hero-buttons{display:block;margin-bottom:12px}.subject-detail .hero-buttons .button{width:100%;font-size:12px}.subject-detail 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