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span{color:var(--color-text-muted);font-family:var(--font-jetbrains-mono);text-transform:uppercase;margin-bottom:.3rem;font-size:.65rem}@media (width<=900px){.lesson-sidebar{display:none}.mobile-back{display:block}.course-grid,.testimonials-grid{grid-template-columns:1fr}}@media (width<=680px){.site-nav a:nth-child(-n+2){display:none}.catalog-hero,.course-overview-hero,.catalog-section{padding-top:3.5rem;padding-bottom:3.5rem}.proof-grid,.steps-grid{grid-template-columns:1fr}.proof-cell,.proof-cell:last-child{border-bottom:1px solid #f6f1e333;border-right:0;min-height:0}.notify-form>div{flex-direction:column}.notify-form input{border-right:3px solid var(--color-ink);border-bottom:0}.lesson-layout{padding-top:2rem}.lesson-header{padding:1.25rem}.lesson-nav{grid-template-columns:1fr}.completion-control,.certificate-meta{flex-direction:column;align-items:stretch}.certificate-meta div:last-child{text-align:left}}@property 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