.alert { padding: 16px 20px; border-radius: 8px; margin-bottom: 20px; font-weight: 500; }
.alert-success { background: #d1fae5; color: #065f46; border: 1px solid #10b981; }
.alert-error { background: #fee2e2; color: #991b1b; border: 1px solid #ef4444; }