@font-face {
    font-family: 'IncheonEducation';
    src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/noonfonts_2307-2@1.0/iceJaram-Rg.woff2') format('woff2');
    font-weight: normal;
    font-display: swap;
}

html {
	font-family: Pretendard;
}


.container {
	display: flex;
	min-height: 100vh;
}

.sidebar {
	text-align: center;
	width: 120px;
	background: grey;
	opacity: 95%;
	color: white;
	padding: 20px;
	min-height: 400px;
	position: fixed;
	top: 0;
	box-shadow: 2px 4px 20px black ;
	line-height: 30px;
	z-index: 10;
}


.main-content {
	flex: 1;
	background-color: #f4f4f4;
	padding: 30px;
	z-index: 1;
}


h1 {
	font-size: 30px;
}


.document {
	background: white;
	max-width: 1000px;
	padding: 40px;
	margin: 40px auto;
	box-shadow: 0px 4px 20px grey;

}

.document p {
	font-size: 16px;
}

.document2 {
	background: white;
	max-width: 800px;
	padding: 50px;
	margin: 0 auto;
	box-shadow: 0px 4px 20px grey;

}

.document2 img {
	float: left;
	margin-right: 40px;
	margin-bottom: 40px;
}

.document3 {
	clear: both;

}

.webring {
	position: fixed;
	bottom: 0;
	left: 0;
	width: 100%;
	height: 25px;
	background-color: #333;
	color: white;
	display: flex;
	justify-content: right;
	align-items: center;
	gap: 5px;
	z-index: 1000;
}


a:link {
	color: white;
	text-decoration: none;
}

a:visited {
	color: white;
	text-decoration: none
}

.webring a {
	color: lightblue;
	text-decoration: underline;
}

.webring a:visited {
	color: lightblue;
	text-decoration: underline;
}


.letter {
	background: white;
	max-width: 1000px;
	padding: 40px;
	margin: 40px auto;
	box-shadow: 0px 4px 20px grey;
	font-size: 30px;
	line-height: 1.2;
	font-family: IncheonEducation;

}


.learning_link a:link {
	color: black;
}

.learning_link a:visited {
	color: black;
}

a:hover {
	color: blue;
	text-decoration: underline wavy blue 2px;
	text-underline-offset: 2px;
}

.vinyl {
	width: 130px;
	background: black;
	border-radius: 20000px;
	padding: 10px;
	position: fixed;
	bottom: 40px;
	right: 20px;
	box-shadow: 0px 0px 20px grey;
	animation: spin 3s linear infinite;
	transition: width 1s ease-in-out;
	z-index: 999;
}

.vinyl:hover {
	animation-play-state: paused;
}

@keyframes spin {
	to {
		transform: rotate(6.28rad);
	}
}

#tree {
	background-image: url("../tree/leaves.jpg");
	background-size: 300px;
	background-attachment: fixed;
}

#record {
	margin: 10px 0 0 160px;
}

audio {
	position: fixed;
	top: 10px;
	right: 10px;
	opacity: 40%;
	z-index: 999;
	box-shadow: 0px 0px 20px grey;
	transition-duration: 1s;
	transition-delay: 1s
}

audio:hover {
	opacity: 100%;
	transition-delay: 0s
}