/* PDF合并/拆分工具样式 */
.pdf-section {
    background: #fff;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}

/* 标签页样式 */
.tool-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 2px solid #e2e8f0;
}

.tab-btn {
    padding: 12px 24px;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: #718096;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
}

.tab-btn:hover {
    color: #667eea;
}

.tab-btn.active {
    color: #667eea;
    border-bottom-color: #667eea;
}

.pdf-list {
    margin-top: 20px;
}

.pdf-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    margin-bottom: 10px;
    background: #fff;
    transition: all 0.3s;
}

.pdf-item:hover {
    border-color: #667eea;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.15);
}

.pdf-info {
    flex: 1;
}

.pdf-actions {
    display: flex;
    gap: 5px;
}

.pdf-remove {
    padding: 6px 12px;
    background: #e53e3e;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.3s;
}

.pdf-remove:hover {
    background: #c53030;
}

.option-input {
    padding: 8px 12px;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    font-size: 14px;
}

.option-input:focus {
    outline: none;
    border-color: #667eea;
}

@media (max-width: 768px) {
    .tool-tabs {
        flex-direction: column;
        gap: 5px;
    }
    
    .tab-btn {
        text-align: left;
        border-bottom: none;
        border-left: 3px solid transparent;
        padding: 10px 15px;
    }
    
    .tab-btn.active {
        border-bottom-color: transparent;
        border-left-color: #667eea;
    }
    
    .pdf-item {
        flex-direction: column;
        text-align: center;
    }
    
    }