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strong{font-size:15px}.field-grid,.lesson-block{grid-template-columns:1fr}.checkpoint{align-items:stretch;flex-direction:column}.checkpoint .primary{width:100%}.vault-grid,.cards-select-grid,.direction-grid{grid-template-columns:1fr}}@media (max-width: 440px){.welcome{padding:16px 12px 32px}.topbar{margin-bottom:20px}.brand-name{font-size:18px}.brand-sub{font-size:9px}.brand-mark{width:38px;height:38px;font-size:1rem;border-radius:10px}.auth-card{border-radius:18px;padding:20px 14px}.page{padding:18px 12px 50px}.grad-summary-card{padding:20px 16px;border-radius:20px}.vault-card{padding:16px;border-radius:16px}.btn-row,.prompt-actions{flex-direction:column;align-items:stretch}.btn-row button,.prompt-actions button{width:100%}}