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640px){.btn-group{flex-direction:column}}.message{padding:1rem;border-radius:6px;margin-top:1rem}.message.success{background-color:#d1fae5;border:1px solid #a7f3d0;color:#065f46}.message.error{background-color:#fee2e2;border:1px solid #fecaca;color:#991b1b}.message.info{background-color:#dbeafe;border:1px solid #93c5fd;color:#1e40af}.message.warning{background-color:#fef3c7;border:1px solid #fcd34d;color:#92400e}.spinner{border:2px solid #f3f4f6;border-top:2px solid #3b82f6;border-radius:50%;width:20px;height:20px;animation:spin 1s linear infinite;display:inline-block;margin-right:.5rem}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.feature-card{background:#fff;border-radius:8px;box-shadow:0 1px 3px #0000001a;border:1px solid #e5e7eb;padding:2rem;text-align:center;transition:box-shadow .2s}.feature-card:hover{box-shadow:0 4px 6px #0000001a}.feature-icon{width:48px;height:48px;margin:0 auto 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#e5e7eb}.text-red{color:#dc2626}.text-gray{color:#6b7280}.text-blue{color:#3b82f6}.bg-gray-50{background-color:#f9fafb}.bg-white{background-color:#fff}.hidden{display:none}.block{display:block}.rounded{border-radius:6px}.rounded-lg{border-radius:8px}.shadow{box-shadow:0 1px 3px #0000001a}.shadow-lg{box-shadow:0 4px 6px #0000001a}@media (max-width: 640px){.container{padding:1rem}h1{font-size:2rem}.nav-links{display:none}}