:root{color:#172033;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:#f3f6fb;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}html{min-width:320px;min-height:100%}body{background:radial-gradient(circle at 0 0,#5770ff1a,#0000 30%),#f3f6fb;min-width:320px;min-height:100vh;margin:0}button,input,textarea,select{font:inherit}a{color:inherit}.page{min-height:100vh;padding:48px 24px 80px}.lesson{width:min(100%,980px);margin:0 auto}.lesson-heading{margin-bottom:36px}.eyebrow{color:#5164d8;letter-spacing:.1em;text-transform:uppercase;margin:0 0 10px;font-size:.82rem;font-weight:800}h1,h2,h3,p{margin-top:0}h1{color:#172033;letter-spacing:-.04em;margin-bottom:0;font-size:clamp(2.7rem,8vw,4.6rem);line-height:.98}h2{color:#172033;margin-bottom:0;font-size:clamp(1.45rem,4vw,2rem);line-height:1.15}.intro{color:#637088;max-width:620px;margin:20px 0 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