/* RESET & GLOBAL */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            background: #f5f7fa;
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            line-height: 1.5;
            padding: 40px 20px;
        }

        .case-study {
            max-width: 1100px;
            margin: 0 auto;
            background: #ffffff;
            border-radius: 24px;
            box-shadow: 0 20px 35px -12px rgba(0,0,0,0.08);
            padding: 32px 28px;
        }

        /* 标题与版式 */
        .case-study h1 {
            font-size: 28px;
            font-weight: 700;
            letter-spacing: -0.01em;
            margin-bottom: 16px;
            color: #0a2540;
            border-left: 5px solid #0066cc;
            padding-left: 20px;
        }

        .case-study h2 {
            font-size: 24px;
            font-weight: 600;
            margin-top: 48px;
            margin-bottom: 20px;
            color: #1e2f3e;
            padding-bottom: 6px;
            border-bottom: 2px solid #eef2f6;
        }

        .case-study h3 {
            font-size: 20px;
            font-weight: 600;
            margin-top: 32px;
            margin-bottom: 16px;
            color: #1e2f3e;
        }

        /* 正文部分字体统一为 16px */
        .case-study p,
        .case-study li,
        .case-study span,
        .product-content p,
        .product-content a {
            font-size: 16px;
            line-height: 1.6;
            color: #2c3e44;
        }

        .case-study .section {
            margin-bottom: 48px;
        }

        .case-study ul {
            margin: 16px 0 8px 28px;
        }

        .case-study li {
            margin: 8px 0;
        }

        /* ========================================
           Product Card Layout: 250x250 Image, Text on Right
        ======================================== */
        .product-full-card {
            background: #ffffff;
            border-radius: 20px;
            box-shadow: 0 8px 20px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.02);
            border: 1px solid #eef2f8;
            margin: 28px 0 24px 0;
            transition: all 0.2s ease;
            display: flex;
            flex-wrap: nowrap;
            align-items: center;
            gap: 20px;
            overflow: hidden;
            width: 100%;
        }

        .product-image-box {
            flex-shrink: 0;
            width: 250px;
            height: 250px;
            background: #f8fafc;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 16px 0 0 16px;
            overflow: hidden;
            position: relative;
        }

        .product-image-box a {
            display: block;
            width: 100%;
            height: 100%;
            line-height: 0;
        }

        .product-image-box img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
            transition: transform 0.2s ease;
        }

        /* Zoom button */
        .zoom-btn {
            position: absolute;
            bottom: 8px;
            right: 8px;
            background: rgba(0,0,0,0.65);
            color: white;
            border: none;
            border-radius: 30px;
            width: 32px;
            height: 32px;
            font-size: 16px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s;
            backdrop-filter: blur(4px);
            z-index: 10;
        }
        .zoom-btn:hover {
            background: #0066cc;
            transform: scale(1.05);
        }

        .product-content {
            flex: 1;
            padding: 18px 20px 18px 0;
            min-width: 0;
        }

        .product-content strong {
            display: block;
            margin-bottom: 12px;
            font-size: 16px;
            font-weight: 600;
        }

        .product-content strong a {
            font-weight: 600;
            font-size: 16px;
            color: #0066cc;
            text-decoration: none;
        }

        .product-content strong a:hover {
            text-decoration: underline;
        }

        .product-content p {
            margin: 8px 0;
            line-height: 1.45;
        }

        .product-content a {
            color: #0066cc;
            text-decoration: none;
            transition: color 0.2s;
        }

        .product-content a:hover {
            text-decoration: underline;
            color: #004c99;
        }

        .product-content p:not(:last-child) {
            margin-bottom: 10px;
        }

        .product-full-card:hover {
            box-shadow: 0 14px 28px rgba(0,0,0,0.08);
            border-color: #dce5ef;
        }

        @media (max-width: 700px) {
            .product-full-card {
                flex-direction: column;
                align-items: stretch;
                gap: 12px;
            }
            .product-image-box {
                width: 250px;
                height: 250px;
                margin: 20px auto 0 auto;
                border-radius: 16px;
            }
            .product-content {
                padding: 0 20px 24px 20px;
                text-align: left;
            }
            .case-study {
                padding: 20px 18px;
            }
        }

        @media (max-width: 480px) {
            .product-image-box {
                width: 220px;
                height: 220px;
            }
        }

        /* 按钮样式 */
        .case-study .cta {
            display: inline-block;
            margin-top: 24px;
            padding: 12px 28px;
            background: #0066cc;
            color: #fff;
            text-decoration: none;
            border-radius: 40px;
            font-weight: 500;
            font-size: 16px;
            transition: background 0.2s;
            box-shadow: 0 2px 6px rgba(0,102,204,0.2);
            border: none;
            cursor: pointer;
        }
        .case-study .cta:hover {
            background: #004d99;
            text-decoration: none;
        }

        /* Lightbox Modal */
        .image-modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.92);
            z-index: 9999;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            backdrop-filter: blur(6px);
        }

        .image-modal.active {
            display: flex;
            animation: fadeIn 0.2s ease;
        }

        .modal-img {
            max-width: 90%;
            max-height: 90%;
            object-fit: contain;
            border-radius: 12px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.4);
        }

        .modal-close {
            position: absolute;
            top: 28px;
            right: 40px;
            font-size: 48px;
            font-weight: 300;
            color: white;
            cursor: pointer;
            background: transparent;
            border: none;
            line-height: 1;
        }
        .modal-close:hover {
            transform: scale(1.1);
            color: #ddd;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        /* ========================================
           横向滚动照片栏样式
        ======================================== */
        .photo-gallery {
            margin: 28px 0 16px 0;
            width: 100%;
            overflow-x: auto;
            overflow-y: hidden;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: thin;
        }

        .gallery-track {
            display: flex;
            gap: 16px;
            padding: 8px 4px 12px 4px;
            min-width: min-content;
        }

        .gallery-item {
            flex-shrink: 0;
            width: 260px;
            height: 200px;
            border-radius: 16px;
            overflow: hidden;
            background: #f0f2f5;
            cursor: pointer;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
        }

        .gallery-item:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px rgba(0,0,0,0.12);
        }

        .gallery-item img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
            transition: transform 0.3s ease;
        }

        .gallery-item:hover img {
            transform: scale(1.02);
        }

        /* 自定义滚动条 */
        .photo-gallery::-webkit-scrollbar {
            height: 6px;
        }
        .photo-gallery::-webkit-scrollbar-track {
            background: #e9ecef;
            border-radius: 10px;
        }
        .photo-gallery::-webkit-scrollbar-thumb {
            background: #bdc4cc;
            border-radius: 10px;
        }
        .photo-gallery::-webkit-scrollbar-thumb:hover {
            background: #0066cc;
        }

        @media (max-width: 600px) {
            .gallery-item {
                width: 200px;
                height: 160px;
            }
        }