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(max-width:640px){.puzzle-lab-shell{width:calc(100% - 16px);padding-top:14px}.puzzle-lab-masthead,.puzzle-lab-footer{flex-direction:column;align-items:stretch}.puzzle-lab-intro{grid-template-columns:1fr;gap:12px}.atlas-summary,.puzzle-idea{min-width:0}.puzzle-idea-heading{flex-direction:column;align-items:start}.puzzle-review{grid-template-columns:1fr 1fr}.puzzle-proof-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.review-field-notes{grid-column:1/-1}}