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rgba(45,212,191,.35);background:transparent;color:var(--accent-strong)}.ghost-button:hover{color:#04100e}.empty-state{padding:40px;text-align:center}@media(max-width:900px){.course-header,.course-layout{grid-template-columns:1fr}.sidebar{position:static;max-height:none}}@media(max-width:560px){.app-shell{width:min(100% - 20px,1240px);padding-top:10px}.course-header{padding-top:16px}.lesson-view{padding:18px}.code-section-heading{align-items:stretch;flex-direction:column}.checker-grid{grid-template-columns:1fr}.language-switch{width:100%}}
