/* Google Fonts  */
/* @import url('https://fonts.googleapis.com/css?family=Noto+Sans+SC:400,500,600'); */
/* @import url('https://fonts.googleapis.com/css2?family=Fira+Code&display=swap'); */

:root{
    --MainColor: hsl(22, 30%, 100%);
    --HueMain: 22;
    --HueComp: 5;
    --Sat60: 60%;
    --Sat50: 50%;
    --Sat40: 40%;
    --Sat30: 30%;
    --Sat25: 25%;
    --Sat20: 20%;
    --Sat10: 10%;
    --Brt99: 99%;
    --Brt98: 98%;
    --Brt97: 97%;
    --Brt95: 95%;
    --Brt90: 90%;
    --Brt80: 80%;
    --Brt70: 70%;
    --Brt50: 50%;
    --Brt40: 40%;
    --Brt30: 30%;
    --Brt20: 20%;
    --ColorWhite: hsl(var(--HueMain), var(--Sat60), var(--Brt99));
    --ColorLight: hsl(var(--HueMain), var(--Sat50), var(--Brt95));
    --ColorMid: hsl(var(--HueMain), var(--Sat40), var(--Brt70));
    --ColorHover: hsl(var(--HueMain), var(--Sat25), var(--Brt40));
    --ColorText: hsl(var(--HueMain), var(--Sat25), var(--Brt30));
    --ColorDark: hsl(var(--HueMain), var(--Sat25), var(--Brt50));
    --ColorBlack: hsl(var(--HueMain), var(--Sat20), var(--Brt20)); 
    --ColorULSLight: hsl(var(--HueMain), var(--Sat20), var(--Brt90));
    --ColorULSMid: hsl(var(--HueMain), var(--Sat20), var(--Brt80));
    --ColorEnv: hsl(var(--HueComp), var(--Sat20), 88%);
    --ColorEnva: hsl(var(--HueComp), var(--Sat20), 88%, 50%);
    --blur: blur(5px);
}

@media screen and (prefers-color-scheme: dark) {
  :root {
    --HueMain: 19;
    --HueComp: 2;
    --Sat60: 10%;
    --Sat50: 15%;
    --Sat40: 20%;
    --Sat30: 25%;
    --Sat25: 30%;
    --Sat20: 40%;
    --Sat10: 50%;
    --Brt99: 6%;
    --Brt98: 7%;
    --Brt97: 8%;
    --Brt95: 10%;
    --Brt90: 20%;
    --Brt80: 30%;
    --Brt70: 40%;
    --Brt50: 50%;
    --Brt40: 60%;
    --Brt30: 70%;
    --Brt20: 80%;
    --ColorEnv: hsl(var(--HueComp), var(--Sat20), 7%);
    --ColorEnva: hsl(var(--HueComp), var(--Sat20), 7%, 50%);
  }
  .content-card .content img{
      background: hsl(var(--HueMain), 10%, 80%);
  }
  .navbar-logo img {
      filter: invert();
  }
  .hljs {
      color: var(--ColorText);
  }
  .hljs > * {
      filter: invert();
  }
}

html {   
	font-size: 16px; 
	position: relative;
	min-height: 100%;
}

body {
	justify-content: center;
	margin-bottom: 2rem;
	background: linear-gradient(90deg, var(--ColorEnv) 0%, var(--ColorLight) 30%, var(--ColorLight) 70%, var(--ColorEnv) 100%);
	font-family: 'Noto Sans SC', sans-serif;
	font-weight: 400;
}

section {
	padding: 0px 0;
	margin-top: 3rem;
}

/* Navbar */
.navbar {
	/*margin-top: 0rem;*/
	
	position: sticky;
    top: 0px;
    width: 100%;
    z-index: 99;
    background: var(--ColorEnva);
    -webkit-backdrop-filter: var(--blur);
    backdrop-filter: var(--blur);
}

.navbar-brand {
	font-size: 1.5rem;
	font-weight: 500;
	margin-left: 0.5rem;
	color: var(--ColorDark);
	transition: all .5s ease;
}

.navbar-logo img{
	margin-left: 1rem;
	padding: 5px;
	max-height: 2.5rem;
}

.navbar-brand:hover {
	color: var(--ColorHover);
}

.nav-link {
	font-size: 0.8rem;
	color: var(--ColorDark);
	font-weight: 500;
	transition: all .5s ease;
}

.nav-link:hover {
	color: var(--ColorHover);
}

.navbar-toggler{
	color: var(--ColorDark);
}

.navbar-collapse {
	margin-right: 1rem;
	text-align: right;
}

/* site top */
.site-top {
	margin: auto;
	margin-top: 2rem;
	/*margin-top: 6rem;*/
	margin-bottom: 3rem;
	text-align: center;
	width: 90%;
}

.site-top .slogan{
	font-size: 2rem;
	font-weight: 500;
	color: var(--ColorHover);
	margin: auto;
}

.site-top .disc{
	font-size: 1rem;
	font-weight: 400;
	color: var(--ColorDark);
	margin: 1rem 1rem;
}

.site-top .search-box{
	margin: auto;
	margin-top:2rem;
	margin-bottom:2rem;
	/* width: 50%; */
	width: 200px;
}

/* search bar */
.form-control{
	background-color: hsl(var(--HueComp), var(--Sat25), var(--Brt98));
}

.form-control:focus{
	background-color: hsl(var(--HueComp), var(--Sat25), var(--Brt99));
	box-shadow: none;
}

/* content grid */
.grid {
	display: grid;
	grid-gap: 30px;
	margin: auto;

}


/* content cards */
.cardbx{
	width: 300px;
	height: 300px;
}

.cardbx .card{
	width: 100%;
	height: 100%;
	background: var(--ColorWhite);
	border-radius: 13px;
	overflow: hidden;
	border-style: none;
}

.cardbx .card .color .bktext{
	position: absolute;
	top: 67%;
	left: -10%;
	font-size: 96px;
	font-weight: 600;
	font-style: italic;
	color: var(--ColorLight);
}

.cardbx .card .color .bktime{
	position: absolute;
	text-align: center;
	width: 80%;
	top: 67%;
	left: 10%;
	font-size: 27px;
	font-weight: 500;
	font-style: italic;
	color: var(--ColorLight);
	transition: 0.75s ease-in-out;
}

.cardbx .card img{
	position: absolute;
	object-fit: cover;
	width: 100%;
	height: 65%;
}

.cardbx .card .color{
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background: var(--ColorWhite);
	clip-path: circle(0px at 0% 65%);
	transition: 0.5s ease-in-out;
}

.cardbx .card:hover .color{
	clip-path: circle(160% at 30% 200%);
}

.cardbx .card .title{
	position: absolute;
	left: 10%;
	bottom: 10%;
	width: 80%;
	height: 60px;
	transition: 0.5s ease-in-out;
	color: var(--ColorHover);
	letter-spacing: 1px;
  	font-size: 21px;
  	font-weight: 500;
  	/*hide and add ellipsis*/
  	display: -webkit-box;
  	-webkit-line-clamp: 2;
  	-webkit-box-orient: vertical;
  	overflow: hidden;
  	text-overflow: ellipsis;
}

.cardbx .card:hover .title{
    color: var(--ColorMid);
	bottom: 30%;
}

/* Go to top button  */
#gtu_button {
	margin: 2rem;
	background-color: hsl(var(--HueMain), var(--Sat25), calc(var(--Brt20) + 10%));
	border-radius: 50%;
	position: fixed;
	bottom: 2rem;
	right: 0.5rem;
	transition: all .3s, opacity .5s, visibility .5s;
	opacity: 0;
	visibility: hidden;
	color: var(--ColorLight);
	width: 40px;
	height: 40px;
	text-align: center;
	line-height: 40px;
	z-index: 50;
}

#gtu_button:hover {
	cursor: pointer;
	background-color: var(--ColorHover);
}

#gtu_button:active {
	background-color: var(--ColorDark);
}

#gtu_button.show {
	opacity: 1;
	visibility: visible;
}

/* Paginator */
.paginator {
	margin-top: 2rem;
	margin-bottom: 2rem;
}

.pagination-link {
	color: var(--ColorMid);
	/* font-family: 'Noto Serif SC', sans-serif; */
	font-size: 1rem;
	font-weight: 500;
	transition: all .5s ease;
}

.pagination-link:hover {
	color: var(--ColorHover);
}

/* content */
.content-card {
	background: hsl(var(--HueComp), var(--Sat50), var(--Brt99));
	/*margin-top: 6rem;*/
	margin-bottom: 3rem;
	border-style: solid;
	border-width: 1px;
	border-color: var(--ColorULSMid);
	border-radius: 13px;
	box-shadow: -0.1rem 0.5rem 0.75rem 0.25rem hsla(var(--HueComp), var(--Sat30), var(--Brt30), 0.1);
	overflow: hidden;
}

.content-card .coverimg img{
	height: 300px;
	overflow: hidden;
	object-fit: cover;
	width: 100%;
}

.content-card .title {
	margin: 3rem 3rem 1rem 3rem;
	font-weight: 500;
	color: var(--ColorText);
}

.text-date,
.text-category a,
.text-category {
	color: var(--ColorMid);
	font-weight: 500;
	/* font-family: 'Noto+Sans+SC', sans-serif; */
}

.content-card .description{
	margin: 1rem 5rem 1rem 5rem;
	text-align: justify;
	color: var(--ColorMid);
	font-size: 0.85rem;
}

.content-card .content{
	margin: 1rem 3rem 3rem 3rem;
	color: var(--ColorHover);
	letter-spacing: 1px;
	user-select: none;
	text-align: justify;
}

/* links */
.content-card .content a{
	color: hsl(var(--HueMain), var(--Sat30), var(--Brt60));
	transition: 0.5s ease-in-out;
}

.content-card .content a:hover{
	color: var(--ColorMid);
}

/* overall */
h1 {
	color: var(--ColorText);
	font-size: 2rem;
	font-weight: 600;
}

h2 {
	color: var(--ColorText);
	font-size: 1.6rem;
	font-weight: 500;
}

h3 {
	font-size: 1.4rem;
	color: var(--ColorText);
	font-weight: 500;
}

h4 {
	font-size: 1.2rem;
	color: var(--ColorText);
}

b, strong {
	font-weight: 500;
	color: var(--ColorBlack);
}

.content-card .content img {
	max-width: 100%;
	overflow: hidden;
	margin-bottom: 1.5rem;
}

a {
	color: var(--ColorMid);
	transition: 0.5s ease-in-out;
}
a:hover {
	color: var(--ColorDark);
	text-decoration: none;
}

/* code */
pre,
code {
	color: var(--ColorText);
	font-family: 'Fira Code', monospace;
	font-size: 0.9rem;
}

pre {
	white-space: pre-wrap;
    word-wrap: break-word;
	padding: 0 1rem;
    overflow-x: auto;
    overflow-y: hidden; 
}


code {
	display: inline-block;
	padding: 0 0.4rem;
	background-color: hsl(var(--HueComp), var(--Sat30), var(--Brt97));
	border: 1px solid var(--ColorULSLight);
	border-radius: 0.4rem;
}

/* latex render */
.MathJax {
    margin:auto;
}

.MathJax_Display {
	margin-top: 0.5rem;
	margin-bottom: 0.5rem;
	padding-top: 0.5rem;
	padding-bottom: 0.5rem;
	/* font-size: 0.8em; */
    overflow-x: auto;
    overflow-y: hidden; 
}

/* saparate line */
hr{
	border: 2px solid var(--ColorULSLight);
}

/* table */
table {
	table-layout: fixed;
	margin: auto;
	empty-cells: show;
	border: 1px solid var(--ColorULSMid);
	width: 90%;
	font-size: 0.8rem;
	margin-bottom: 1rem;
    word-wrap: break-word;
}

table tr {
    border: 1px solid var(--ColorULSLight);
}

table tr:nth-child(2n),
thead {
    background-color: var(--ColorWhite);
}

table th {
    font-weight: 500;
    border: 1px solid var(--ColorULSMid);
    padding: 0.5rem 1rem;
}

table td {
    border: 1px solid var(--ColorULSMid);
    padding: 0.5rem 1rem;
}

/* quote */
blockquote {
	padding: 0.25rem 1rem;
	margin: 0 0 1rem 1rem;
	border-left: 0.4rem solid var(--ColorLight);
	font-size: 0.9rem;
	color: var(--ColorMid);
}

/* Footer */
footer {
	position: absolute;
	/* bottom: 0; */
	width: 100%;
	/* height: 4rem; */
	/* line-height: 60px; */
	font-size: 0.8rem;
	padding-top: 2rem;
	padding-bottom: 1rem;
}

.text-grey {
	color: var(--ColorMid);
}

/* VIDEO EMBED RESPONSIVE */
video {
	overflow: hidden;
	width: 90%;
	margin: auto;
	margin-top: 1rem;
	margin-bottom: 1rem;
}

.content-card .content .spotlight-img{
    object-fit: cover;
}


@media (min-width: 300px) and (max-width: 767.5px) {
    :root{
        --blur: blur(3px);
    }
	html{
		font-size: 14px;
	}
	.grid {
		width: 300px;
		grid-template-columns: 300px;
		/*grid-template-rows: 300px 300px 300px 300px 300px 300px;*/
	}
	.navbar-brand{
		display: none;
	}
	.site-top{
		/*margin-top: 5rem;*/
		margin-bottom: 2rem;
	}
	section {
		margin-top: 1.5rem;
	}
	.container {
		padding: 0;
	}
	.content-card .coverimg{
		display: none;
	}
	.content-card .content{
		margin: 1rem 1.5rem 1.5rem 1.5rem;
		text-align: left;
	}
	.content-card .title {
		margin: 2rem 2rem 1rem 2rem;
	}
	.content-card .description{
	    margin: 1rem 2rem 1rem 2rem;
	    text-align: center;
	}
	table th, table td{
		padding: 0.2rem 0.5rem;
	}
	pre {
		padding: 0;
	}
	.content-card .content .spotlight-img{
	    width: 400px;
	    max-height: 300px;
	    margin: 2% 2% 2% 2%;
	}
}

@media (min-width: 768px) and (max-width: 1199.5px) {
    :root{
        --blur: blur(4px);
    }
	.grid {
		width: 630px;
		grid-template-columns: 300px 300px;
		/*grid-template-rows: 300px 300px 300px;*/
	}
	.navbar-logo{
		display: none;
	}
	.content-card .content .spotlight-img{
	    width: 240px;
	    height: 240px;
	    margin: 2% 2% 2% 2%;
	}
}

@media (min-width: 1200px) {
	.grid {
		min-width: 960px;
		max-width: 75vh;
		width: 75vw;
		/*grid-template-columns: 300px 300px 300px;*/
		/*grid-template-rows: 300px 300px;*/
		grid-template-columns: 33% 33% 33%;
		/*grid-template-rows: 30vh 30vh;*/
	    justify-content: center;
	    justify-items: center;
	    grid-gap: 2.5vw;
	}
	.navbar-logo{
		display: none;
	}
	.cardbx {
	    width: 25vh;
	    min-width: 300px;
	    max-width: 25vw;
	    height: 25vh;
	    min-height: 300px;
	    max-height: 25vw;
	}
	.container{
	    max-width: 66%;
	    min-width: 1200px;
	}
	.content-card .content .spotlight-img{
	    width: 200px;
	    height: 200px;
	    margin: 1% 1% 1% 1%;
	}
}

/* loading */
#preloader {
	position: fixed;
	background: var(--ColorULSLight);
	z-index: 100;
	height: 100%;
	width: 100%;
	overflow: hidden;
  }

  .spinner {
	width: 40px;
	height: 40px;
	background-color: var(--ColorDark);
	border-radius: 3px;
	margin: 3rem auto;
	-webkit-animation: sk-rotateplane 1.2s infinite ease-in-out;
	animation: sk-rotateplane 1.2s infinite ease-in-out;
  }
  
  @-webkit-keyframes sk-rotateplane {
	0% { -webkit-transform: perspective(120px) }
	50% { -webkit-transform: perspective(120px) rotateY(180deg) }
	100% { -webkit-transform: perspective(120px) rotateY(180deg)  rotateX(180deg) }
  }
  
  @keyframes sk-rotateplane {
	0% { 
	  transform: perspective(120px) rotateX(0deg) rotateY(0deg);
	  -webkit-transform: perspective(120px) rotateX(0deg) rotateY(0deg) 
	} 50% { 
	  transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg);
	  -webkit-transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg) 
	} 100% { 
	  transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
	  -webkit-transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
	}
  }

/* Toc */

#toc {
    float: right;
    width: 30%;
    margin: 0 2em 0 2em;
    padding: 0 1em 0;
    border-left: 3px solid var(--ColorMid);
    border-left: 3px solid var(--ColorDark);
    display: none;
    background-color: hsl(var(--HueComp), var(--Sat50), var(--Brt99));
}

#toc h4 {
    margin: 0 auto 10px;
    color: var(--ColorMid);
    font-size: .9em;
    text-transform: uppercase;
}

#toc ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
    padding-left: 0;
    font-size: .9em;
    color: var(--ColorMid);
}

.docs-container {
    max-width: 2000px;
    margin: auto;
    position: relative;
}