/* 赞助按钮样式 */
.sponsor-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 100;
}

.sponsor-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    transition: all 0.3s ease;
}

.sponsor-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.sponsor-image {
    position: fixed;
    bottom: 90px;
    right: 20px;
    z-index: 99;
    background: white;
    border-radius: 10px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    padding: 15px;
    display: none;
    max-width: 300px;
    animation: fadeIn 0.3s ease;
}

.sponsor-image img {
    max-width: 100%;
    height: auto;
    display: block;
}

.sponsor-text {
    text-align: center;
    margin-top: 10px;
    font-size: 14px;
    color: #666;
    padding: 0 5px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    .sponsor-container {
        bottom: 15px;
        right: 15px;
    }
    
    .sponsor-btn {
        width: 45px;
        height: 45px;
        font-size: 18px;
    }
    
    .sponsor-image {
        bottom: 75px;
        right: 15px;
        padding: 12px;
        max-width: 250px;
    }
}

@media (max-width: 480px) {
    .sponsor-container {
        bottom: 10px;
        right: 10px;
    }
    
    .sponsor-btn {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
    
    .sponsor-image {
        bottom: 65px;
        right: 10px;
        padding: 10px;
        max-width: 200px;
    }
}