.mainboard {
	padding: 16px;
	box-sizing: border-box;
	height: 100vh;
	background: linear-gradient(180deg, #f8fbff 0%, #eef4ff 100%);
	font-family: "Segoe UI", "Yu Gothic UI", sans-serif;
	color: #1f2a44;
}

.icon {
	position: grid;
	top: 10px;
	left: 10px;
	z-index: 1000;
}

.icon_link {
	display: flex;
	align-items: center;
	gap: 12px;
	text-decoration: none;
	border: 1px solid #d9e2f0;
	border-radius: 30px;
	padding: 10px 16px;
	background: #ffffff;
	box-shadow: 0 6px 18px rgba(20, 41, 78, 0.09);
	transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.icon_link:hover {
	transform: translateY(-3px);
	box-shadow: 0 12px 22px rgba(20, 41, 78, 0.14);
}

.icon_img {
	width: 50px;
	height: 50px;
	border-radius: 50%;
	object-fit: cover;
}

.icon_text {
	font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
	font-size: 24px;
	font-weight: 600;
	color: #24324d;
	letter-spacing: 0.5px;
}

.listboard {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: flex-start;
	margin-top: 16px;
	padding: 18px 14px;
	border: 1px solid #d9e2f0;
	border-radius: 18px;
	background: #ffffff;
	box-shadow: 0 10px 30px rgba(20, 41, 78, 0.08);
}

.listboard .first {
	font-size: 100%;
	text-align: center;
}

.ex_big {
	font-size: 165%;
}

.list {
	text-align: center;
	font-size: 45px;
	width: 100%;
	padding: 0 6px;
	box-sizing: border-box;
}

.list a {
	display: block;
	margin: 6px 0;
	white-space: normal;
	line-height: 1.2;
	text-decoration: none;
	font-weight: 700;
	border-radius: 12px;
	padding: 4px 8px;
	transition: transform 0.2s ease, background-color 0.2s ease;
}

.listboard > a.tcolor_orange {
	position: relative;
	display: block;
	width: 100%;
	max-width: 100%;
	height: 20px;
	font-size: 0;
	line-height: 0;
	color: transparent;
	opacity: 0.75;
	margin: 10px 0 12px;
}

.listboard > a.tcolor_orange::before,
.listboard > a.tcolor_orange::after {
	content: "";
	display: block;
	width: 100%;
	height: 2px;
	border-radius: 999px;
	background: linear-gradient(90deg, #ffd166 0%, #ff9e3d 100%);
}

.listboard > a.tcolor_orange::after {
	margin-top: 8px;
}

.list a:hover {
	transform: translateX(4px);
	background-color: #f3f7ff;
}

.list a:not(:empty)::before {
	content: "・";
}

.tcolor_blue {
	color: #0056b3;
}

.tcolor_orange {
	color: #ff8c00;
}

.tsize {
	font-size: 36px;
	color: #ffd24a;
	text-shadow: 
		-2px -2px 0 #ff8c00,
		2px -2px 0 #ff8c00,
		-2px 2px 0 #ff8c00,
		2px 2px 0 #ff8c00;
	font-weight: bold;
}

.tcolor_vermilion {
	color: #e34234;
}

.tcolor_orange {
	color: orange;
}

.tcolor_orchid {
	color: #da70d6;
}

@media (max-width: 900px) {
	.mainboard {
		height: auto;
		min-height: 100vh;
	}

	.list {
		font-size: 34px;
	}

	.icon_text {
		font-size: 20px;
	}
}