.language-selector {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    padding: 10px;
    background: #fff;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    border: 1px solid #ddd;
    transition: opacity 0.2s ease-in-out;
}

.language-selector select {
    padding: 8px;
    border-radius: 4px;
    border: 1px solid #ddd;
    font-size: 14px;
    width: 120px;
    cursor: pointer;
    background: #fff;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.language-selector select:focus {
    outline: none;
    border-color: #4A90E2;
}

/* 目录中的语言选择器 */
.summary-language-selector {
    margin-bottom: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e9ecef;
    margin-top: 10px;
    opacity: 1;
    transition: opacity 0.2s ease-in-out, transform 0.2s ease-in-out;
    transform: translateY(0);
}

/* 防闪烁：确保选择器在加载时不会突然出现 */
.summary-language-selector.loading {
    opacity: 0;
    transform: translateY(-10px);
}

.summary-language-selector label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #495057;
    font-size: 14px;
    transition: color 0.15s ease-in-out;
}

.summary-language-selector select {
    width: 100%;
    padding: 10px;
    border-radius: 6px;
    border: 1px solid #ced4da;
    font-size: 14px;
    background-color: #fff;
    cursor: pointer;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out, background-color 0.15s ease-in-out;
}

.summary-language-selector select:focus {
    outline: none;
    border-color: #4A90E2;
    box-shadow: 0 0 0 0.2rem rgba(74, 144, 226, 0.25);
}

/* 选择器更新时的平滑效果 */
.summary-language-selector.updating {
    opacity: 0.7;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .language-selector {
        top: 10px;
        right: 10px;
        padding: 8px;
    }
    
    .language-selector select {
        width: 100px;
        font-size: 12px;
        padding: 6px;
    }
    
    .summary-language-selector {
        margin-bottom: 15px;
        padding: 12px;
    }
}