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900px){.main-content{flex-direction:column}.sidebar{width:100%;max-height:45vh;border-right:none;border-bottom:1px solid var(--panel-border)}.canvas-area{padding:20px}.wood-grid{grid-template-columns:repeat(8,1fr)}.pattern-grid{grid-template-columns:repeat(6,1fr)}}@media (max-width: 600px){.toolbar{flex-wrap:wrap;gap:6px}.toolbar-center{order:-1;width:100%;margin-bottom:4px}.wood-grid{grid-template-columns:repeat(5,1fr)}.pattern-grid{grid-template-columns:repeat(3,1fr)}}@media print{.instructions-header .close-btn,.instructions-header-actions,.purchase-success-banner,.purchase-gate,.feedback-trigger,.instructions-footer{display:none}.instructions-page{background:#fff}.instructions-header{background:var(--green-deep);-webkit-print-color-adjust:exact;print-color-adjust:exact}.instructions-section{break-inside:avoid;box-shadow:none;border:1px solid var(--border)}.step-card{break-inside:avoid}.step-diagram{background:#f0f0f0;-webkit-print-color-adjust:exact;print-color-adjust:exact;break-inside:avoid}.step-diagram svg text{fill:#333!important}}