:root{--ink:#07111f;--muted:#4d6178;--blue:#075eff;--blue-dark:#064bd0;--blue-soft:#eaf3ff;--page-bg:#f4f9ff;--white:#fff;--line:#07111f24;--font-body:Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-display:"Arial Black", Impact, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--step-caption:.625rem;--step-eyebrow:.75rem;--step-label:.8125rem;--step-button:.875rem;--step-button-lg:.9375rem;--step-body:1rem;--step-body-lg:1.125rem;--step-body-xl:1.25rem;--step-brand:1.3125rem;--display-hero:clamp(1.65rem, 3.84vw, 3.225rem);--display-section:clamp(1.575rem, 3.36vw, 2.85rem);--display-split:clamp(1.5rem, 2.76vw, 2.55rem);--display-card:clamp(1.05rem, 1.2vw, 1.3rem);--display-footer:clamp(1.65rem, 3.12vw, 2.7rem);--display-signup:clamp(2.1rem, 4.8vw, 3.9rem)}*{box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{min-width:320px;color:var(--ink);background:var(--page-bg);font-family:var(--font-body);font-size:var(--step-body);margin:0;overflow-x:clip}img{max-width:100%}a{color:inherit;-webkit-tap-highlight-color:transparent;text-decoration:none}.page{min-height:100vh}.exercise-page{background:#f4f9ff;min-height:100vh;padding:76px 0 104px}.exercise-shell{width:min(1240px,100% - 40px);margin:0 auto}.exercise-catalog-hero{color:var(--ink);background:radial-gradient(circle at 72% 28%,#075eff1a 0 2px,#0000 3px) 0 0/28px 28px,linear-gradient(135deg,#edf7ff 0%,#fff 58%,#e7f1ff 100%);padding:72px 0 78px;position:relative;overflow:hidden}.exercise-catalog-hero:after{content:"";pointer-events:none;border:96px solid #075eff12;border-radius:50%;width:620px;height:620px;position:absolute;top:94px;right:-170px}.exercise-catalog-hero 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minmax(0,1fr);align-items:start;gap:clamp(48px,6vw,88px);margin-top:88px;display:grid}.exercise-guide-rail{z-index:2;align-self:start;position:sticky;top:112px}.exercise-guide-label{color:var(--ink);font-size:var(--step-caption);letter-spacing:.12em;text-transform:uppercase;margin:0 0 18px;font-weight:950}.exercise-guide-nav{border-left:1px solid #07111f33;flex-direction:column;display:flex}.exercise-guide-nav a{min-height:44px;color:var(--muted);font-size:var(--step-label);align-items:center;padding:10px 0 10px 18px;font-weight:900;line-height:1.25;transition:color .16s;display:flex;position:relative}.exercise-guide-nav a:before{content:"";background:0 0;width:3px;transition:background .16s;position:absolute;top:8px;bottom:8px;left:-2px}.exercise-guide-nav a:hover,.exercise-guide-nav a:focus-visible{color:var(--blue)}.exercise-guide-nav a:hover:before,.exercise-guide-nav a:focus-visible:before{background:var(--blue)}.exercise-guide-nav a:focus-visible{outline:2px solid 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p{color:var(--muted);font-size:var(--exercise-body-size);font-weight:600;line-height:var(--exercise-body-leading);margin:0}.exercise-deep-dive{gap:0;margin-top:112px;display:grid}.exercise-deep-dive h2,.exercise-variations h2{font-family:var(--font-display);font-size:var(--display-section);text-transform:uppercase;text-wrap:balance;margin:0;line-height:.98}.exercise-mistake-grid h3,.exercise-variation-columns h3,.exercise-variation-columns h4{font-family:var(--font-display);text-transform:uppercase;margin:0}.exercise-mistake-grid p,.exercise-variation-columns p{color:var(--muted);font-size:var(--exercise-body-size);font-weight:600;line-height:var(--exercise-body-leading);margin:8px 0 0}.exercise-common-mistakes{color:var(--ink);box-shadow:none;background:0 0;border-bottom:0;border-radius:0;padding:80px 0}.exercise-common-mistakes .exercise-section-label{color:var(--blue)}.exercise-common-mistakes>header{max-width:820px;display:block}.exercise-common-mistakes>header 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