:root {
        --color-radiocard-selected: <?php echo defined('COLOR') ?>;   /* fallback si no está definida */
    }

        * { font-family: 'Inter', sans-serif; }
        .radio-card {
            transition: all 0.2s ease;
            cursor: pointer;
        }
        .radio-card:hover { transform: translateY(-4px); }

        .btn-primary {
            background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 25px -5px rgba(59, 130, 246, 0.4);
        }
        .btn-success {
            background: linear-gradient(135deg, #10b981 0%, #059669 100%);
        }
        .table-row:hover { background-color: #f8fafc; }
        .badge-pendiente { background-color: #fef3c7; color: #92400e; }
        .badge-vencida   { background-color: #fee2e2; color: #991b1b; }
        .badge-pagado    { background-color: #d1fae5; color: #065f46; }
        .loading::after {
            content: '';
            position: absolute;
            top: 0; left: 0;
            width: 100%; height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.8), transparent);
            animation: loading 1.5s infinite;
        }
        @keyframes loading {
            0% { transform: translateX(-100%); }
            100% { transform: translateX(100%); }
        }