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900px){.page-head{flex-direction:column;align-items:stretch}.hero-stats{max-width:none;justify-content:flex-start}.learning-summary{grid-template-columns:repeat(2,minmax(0,1fr))}.learning-controls{grid-template-columns:1fr}.learning-actions{justify-content:flex-start}}@media (max-width: 720px){.app-shell{flex-direction:column}.sidebar{width:100%;flex:none;height:auto;position:relative;overflow-y:visible;border-right:none;border-bottom:1px solid var(--border)}.sidebar-actions{margin-top:16px}.main{padding:24px clamp(16px,4vw,32px) 48px}.learning-summary{grid-template-columns:1fr}.learning-controls{gap:16px;padding:15px}.learning-actions{align-items:stretch;flex-direction:column}.learning-actions .btn{width:100%}}