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16px}.page-header,.recommendation-card,.file-card,.footer-actions,.quiz-header{flex-direction:column;align-items:stretch}.page-header-action,.page-header-action .primary-button,.recommendation-card .primary-button,.footer-actions .primary-button,.footer-actions .secondary-button{width:100%}.stats-grid.three,.study-card-grid,.settings-grid,.form-row{grid-template-columns:1fr}.panel{padding:18px}.section-heading.compact,.card-footer-row,.topic-row,.preference-row,.file-actions{flex-direction:column;align-items:stretch}.file-main{align-items:flex-start}.file-actions,.file-actions button{width:100%}.chat-panel{min-height:560px}.chat-bubble{max-width:100%}.topic-score{width:100%}.mobile-bottom-nav{z-index:30;padding:8px 8px calc(8px + env(safe-area-inset-bottom));background:color-mix(in srgb, var(--surface) 94%, transparent);border-top:1px solid 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