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1rem;border-radius:var(--radius-sm);margin-bottom:1rem;font-size:.9rem}.error-banner strong{color:var(--error)}@media(max-width:768px){.app{padding:1.5rem 1rem}.app-header h1{font-size:2.2rem}.app-main{grid-template-columns:1fr;gap:2rem}.message-display{position:static;min-height:200px}.form-row{grid-template-columns:1fr}}