/* AI默认特色图片样式 */
.ziyoukan-ai-default-thumbnail {
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    background: linear-gradient(45deg, #f8f9fa, #e9ecef);
    position: relative;
    overflow: hidden;
}

.ziyoukan-ai-default-thumbnail:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.ziyoukan-ai-default-thumbnail::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, 
        rgba(52, 152, 219, 0.1) 0%, 
        rgba(46, 204, 113, 0.1) 25%, 
        rgba(155, 89, 182, 0.1) 50%, 
        rgba(241, 196, 15, 0.1) 75%, 
        rgba(230, 126, 34, 0.1) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.ziyoukan-ai-default-thumbnail:hover::before {
    opacity: 1;
}

/* AI生成标记 */
.ziyoukan-ai-default-thumbnail[data-ai-generated="true"] {
    position: relative;
}

.ziyoukan-ai-default-thumbnail[data-ai-generated="true"]::after {
    content: 'AI';
    position: absolute;
    top: 10px;
    right: 10px;
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    font-size: 12px;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 12px;
    box-shadow: 0 2px 6px rgba(52, 152, 219, 0.3);
    z-index: 2;
}

/* 不同风格的AI图片样式 */
.ziyoukan-ai-default-thumbnail.ai-style-business {
    border: 2px solid #3498db;
    background: linear-gradient(45deg, #ecf0f1, #d6eaf8);
}

.ziyoukan-ai-default-thumbnail.ai-style-technology {
    border: 2px solid #9b59b6;
    background: linear-gradient(45deg, #f8f9fa, #e8daef);
}

.ziyoukan-ai-default-thumbnail.ai-style-creative {
    border: 2px solid #e74c3c;
    background: linear-gradient(45deg, #fadbd8, #f5b7b1);
}

.ziyoukan-ai-default-thumbnail.ai-style-minimal {
    border: 1px solid #bdc3c7;
    background: linear-gradient(45deg, #ffffff, #f8f9fa);
}

.ziyoukan-ai-default-thumbnail.ai-style-professional {
    border: 2px solid #2c3e50;
    background: linear-gradient(45deg, #ecf0f1, #d5dbdb);
}

.ziyoukan-ai-default-thumbnail.ai-style-abstract {
    border: 2px solid #f39c12;
    background: linear-gradient(45deg, #fef9e7, #fdebd0);
}

.ziyoukan-ai-default-thumbnail.ai-style-nature {
    border: 2px solid #27ae60;
    background: linear-gradient(45deg, #e8f8f5, #d1f2eb);
}

.ziyoukan-ai-default-thumbnail.ai-style-people {
    border: 2px solid #8e44ad;
    background: linear-gradient(45deg, #f4ecf7, #e8daef);
}

/* 加载动画 */
.ziyoukan-ai-default-thumbnail.ai-loading {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: aiImageLoading 1.5s infinite;
}

@keyframes aiImageLoading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .ziyoukan-ai-default-thumbnail {
        border-radius: 6px;
    }
    
    .ziyoukan-ai-default-thumbnail[data-ai-generated="true"]::after {
        font-size: 10px;
        padding: 3px 6px;
        top: 8px;
        right: 8px;
    }
}

@media (max-width: 480px) {
    .ziyoukan-ai-default-thumbnail {
        border-radius: 4px;
    }
    
    .ziyoukan-ai-default-thumbnail[data-ai-generated="true"]::after {
        font-size: 9px;
        padding: 2px 5px;
        top: 6px;
        right: 6px;
    }
}