\documentclass[12pt, a4paper]{article} \usepackage[utf8]{inputenc} \usepackage[T1]{fontenc} \usepackage{amsmath, amssymb, amsthm} \allowdisplaybreaks \usepackage{geometry} \geometry{left=2cm, right=2cm, top=2cm, bottom=2cm} \usepackage{xcolor} \usepackage[many]{tcolorbox} \usepackage{enumitem} \usetikzlibrary{arrows.meta} \usepackage{indentfirst} \usepackage{ctex} \definecolor{NSFblue}{RGB}{0, 112, 192} \definecolor{NSFred}{RGB}{255, 0, 0} \definecolor{HighLight}{RGB}{0,31,141} \definecolor{NSFCBlue}{RGB}{0, 82, 147} \definecolor{DeepBlue}{HTML}{005073} \definecolor{GrayText}{RGB}{80, 80, 80}
\definecolor{NSFCGreen}{RGB}{0, 128, 128} \definecolor{NSFCOrange}{RGB}{255, 127, 0} \definecolor{LightGray}{RGB}{230, 230, 230} \definecolor{NSFCBrightBlue}{RGB}{0, 114, 189}
\definecolor{SkyBlue}{HTML}{4A90E2}
\definecolor{LightRoyalBlue}{RGB}{65, 105, 225} \definecolor{CornflowerBlue}{HTML}{6495ED}
\definecolor{PaleBlue}{RGB}{211, 223, 236}