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color: #e2e8f0;n line-height: 1.5;n margin-bottom: .75rem;n}nn.concept-highlight{n background: rgba(59,130,246,.1);n border: 1px solid rgba(59,130,246,.2);n border-radius: 6px;n padding: .5rem;n color: #93c5fd;n font-size: .9rem;n}nn.tutorial-controls{n display: flex;n gap: 1rem;n margin-bottom: 1rem;n}nn.tutorial-btn{n flex: 1;n background: rgba(59,130,246,.2);n border: 1px solid rgba(59,130,246,.3);n border-radius: 8px;n color: #93c5fd;n padding: .75rem;n cursor: pointer;n transition: all .2s;n font-weight: 600;n}nn.tutorial-btn:hover:not(:disabled){n background: rgba(59,130,246,.3);n border-color: rgba(59,130,246,.5);n transform: translateY(-1px);n}nn.tutorial-btn:disabled{n opacity: .5;n cursor: not-allowed;n}nn.tutorial-btn.next{n background: linear-gradient(135deg,#10b981,#059669);n border-color: #10b981;n color: white;n}nn.tutorial-btn.next:hover:not(:disabled){n background: linear-gradient(135deg,#059669,#047857);n border-color: #059669;n}nn.tutorial-completion{n background: 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