/* Header gradient */
        .upcoming-header {
            background: linear-gradient(135deg, rgba(139,69,19,0.9), rgba(160,82,45,0.8));
            color: #fff;
            border: 3px solid #5a2d0c;
        }
        .nail-left, .nail-right {
            position: absolute;
            top: 10px;
            width: 15px;
            height: 15px;
            background: #555;
            border-radius: 50%;
            box-shadow: inset 2px 2px 4px #000;
        }
        .nail-left { left: 10px; }
        .nail-right { right: 10px; }

        /* Card customizations */
        .card-stock {
            background: rgba(255,255,255,0.8);
        }
        .card-title-stock {
            color: #8bf581ff;
            text-shadow: 2px 2px 4px black;
        }

        /* Responsive Columns */
        .col-stock {
            flex: 0 0 20%;
            max-width: 20%;
        }

        @media (max-width: 1024px) { /* tablet / iPad */
            .col-stock {
                flex: 0 0 33.3333%;
                max-width: 33.3333%;
            }
        }

        @media (max-width: 768px) { /* mobile */
            .col-stock {
                flex: 0 0 50%;
                max-width: 50%;
            }
        }

        @media (max-width: 480px) { /* extra small */
            .col-stock {
                flex: 0 0 50%;
                max-width: 50%;
            }
        }