* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Helvetica Neue", Arial, sans-serif;
        }

        body {
            background-color: #f8f9fa;
            padding: 40px 20px;
        }

        .pcb-container {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .pcb-card {
            background-color: #ffffff;
            border-radius: 8px;
            padding: 28px 24px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
            border-left: 4px solid #0066cc;
        }

        .pcb-card__header {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
        }

        .pcb-card__icon {
            font-size: 24px;
            color: #0066cc;
            margin-right: 12px;
        }

        .pcb-card__title {
            font-size: 20px;
            font-weight: 600;
            color: #333333;
        }

        .pcb-card__desc {
            font-size: 14px;
            line-height: 1.6;
            color: #666666;
            margin-bottom: 16px;
        }

        .pcb-card__specs {
            list-style: none;
        }

        .pcb-card__specs li {
            font-size: 13px;
            line-height: 1.8;
            color: #555555;
            padding-left: 16px;
            position: relative;
            margin-bottom: 4px;
        }

        .pcb-card__specs li::before {
            content: "•";
            position: absolute;
            left: 0;
            color: #0066cc;
            font-weight: bold;
        }

        /* 响应式适配：小屏幕自动换行 */
        @media (max-width: 1200px) {
            .pcb-container {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .pcb-container {
                grid-template-columns: 1fr;
            }
        }