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

        body {
            background: #f0f2f5;
            padding: 20px 0;
        }

        .certificate-section {
            max-width: 1200px;
            margin: 0 auto;
            text-align: center;
        }

        .section-title {
            margin-bottom: 25px;
            padding: 0 15px;
        }

        .section-title h1 {
            font-size: 36px;
            color: #222;
            margin-bottom: 8px;
            position: relative;
            display: inline-block;
        }

        .section-title h1::after {
            content: '';
            position: absolute;
            bottom: -6px;
            left: 50%;
            transform: translateX(-50%);
            width: 100%;
            height: 2px;
            background: linear-gradient(90deg, #ff3366, #9933ff);
        }

        .section-title p {
            font-size: 18px;
            color: #666;
            margin-top: 15px;
        }

        .carousel-container {
            position: relative;
            overflow: hidden;
            background: white;
            padding: 20px 0;
        }

        .carousel-track {
            display: flex;
            transition: transform 0.5s ease-in-out;
        }

        .certificate-item {
            flex: 0 0 25%;
            padding: 0 10px;
            transition: transform 0.3s ease;
        }

        .certificate-item img {
            width: 100%;
            height: auto;
            border-radius: 4px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }

        .carousel-btn {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            background: rgba(255,255,255,0.8);
            border: none;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            font-size: 20px;
            cursor: pointer;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            z-index: 10;
        }

        .prev-btn { left: 5px; }
        .next-btn { right: 5px; }

        .carousel-dots {
            display: flex;
            justify-content: center;
            gap: 6px;
            margin-top: 15px;
        }

        .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #ccc;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .dot.active {
            background: #ff3366;
            width: 18px;
            border-radius: 4px;
        }

        /* 手机端适配 */
        @media (max-width: 767px) {
            .section-title h1 { font-size: 13px; }
            .section-title p { font-size: 8px; margin-top: 8px; }
            .certificate-item {
                flex: 0 0 33.333%; /* 手机端展示3张 */
                padding: 0 4px; 
            }
            .carousel-btn {
                width: 30px;
                height: 30px;
                font-size: 16px;
                background: rgba(255,255,255,0.6);
            }
            .carousel-container { padding: 10px 0; }
        }