/* 固定位置图片广告样式 */
        .floating-ad {
            position: fixed;
            top: 320px;
            left: 30px;
            width: 180px;
            height: 220px;
            background: white;
            border-radius: 12px;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
            display: flex;
            flex-direction: column;
            align-items: center;
            z-index: 1000;
            transition: transform 0.3s, box-shadow 0.3s;
            overflow: hidden;
            border: 1px solid #e0e0e0;
        }
        
        .floating-ad:hover {
            transform: scale(1.05);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
        }
        
        .ad-image {
            width: 100%;
            height: 160px;
            object-fit: cover;
            border-bottom: 1px solid #f0f0f0;
            transition: height 0.3s;
        }
        
        .ad-content {
            text-align: center;
            padding: 15px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            width: 100%;
        }
        
        .ad-title {
            font-weight: bold;
            font-size: 18px;
            margin-bottom: 8px;
            color: #2c3e50;
        }
        
        .ad-text {
            font-size: 14px;
            margin-bottom: 12px;
            color: #7f8c8d;
        }
        
        .ad-button {
            background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
            color: white;
            border: none;
            padding: 8px 15px;
            border-radius: 20px;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s;
            width: 100%;
        }
        
        .ad-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 10px rgba(37, 117, 252, 0.3);
        }
        
        .close-btn {
            position: absolute;
            top: 8px;
            right: 10px;
            background: rgba(0, 0, 0, 0.5);
            border: none;
            color: white;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            font-size: 14px;
            transition: background 0.3s;
        }
        
        .close-btn:hover {
            background: rgba(0, 0, 0, 0.7);
        }