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270px;align-items:start;gap:30px;padding-top:27px;display:grid}.lesson-main,.lesson-aside{min-width:0}.mobile-route-summary{display:none}.lesson-tabs{border-bottom:1px solid #35412e;align-items:center;gap:22px;margin-bottom:30px;padding-bottom:0;display:flex}.lesson-tabs>button{color:#91a481;white-space:nowrap;align-items:center;gap:7px;padding:11px 0 14px;font-size:10px;display:flex;position:relative}.lesson-tabs>button.selected{color:var(--lesson-accent)}.lesson-tabs>button.selected:after{content:"";background:var(--lesson-accent);height:2px;position:absolute;bottom:-1px;left:0;right:0}.lesson-tabs button>span{background:#27331f;border-radius:4px;padding:3px 4px;font-size:10px}.overview-section{padding:3px 0 32px;scroll-margin-top:28px}.overview-section h2{letter-spacing:-.6px;margin:11px 0 18px;font-size:25px}.overview-summary{color:#c6d1bd;font-size:14px;line-height:1.95}.formal-explanation{background:#1b2317;border:1px solid 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#384331;border-radius:14px;min-width:0;margin-bottom:25px;padding:25px;position:relative}.panel-heading{justify-content:space-between;align-items:center;gap:15px;margin-bottom:20px;display:flex}.panel-heading h2{letter-spacing:-.7px;margin-top:5px;font-size:24px}.panel-heading h3{letter-spacing:-.5px;margin-top:5px;font-size:21px}.panel-heading>svg{color:var(--lesson-accent)}.panel-heading .eyebrow{color:var(--lesson-accent);font-size:10px}.example-tabs{flex-wrap:wrap;gap:7px;margin-bottom:18px;display:flex}.example-tabs .btn{gap:6px;min-height:35px;padding:8px 10px;font-size:10px}.example-index{color:#97a886;font-size:10px}.example-tabs .selected .example-index{color:var(--lesson-accent)}.walkthrough-problem,.exercise-problem{color:#b5c3a8;margin-bottom:20px;font-size:12px;line-height:1.8}.equation-line{color:#e5efdc;background-color:#141a11;background-image:radial-gradient(#77926325 .7px,#0000 .7px);background-size:14px 14px;border:1px solid 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