@font-face {
  font-family: 'Intro';
  src: url('../font/Intro.eot?#iefix') format('embedded-opentype'),  url('../font/Intro.otf')  format('opentype'),
	     url('../font/Intro.woff') format('woff'), url('../font/Intro.ttf')  format('truetype'), url('../font/Intro.svg#Intro') format('svg');
  font-weight: normal;
  font-style: normal;
}
@font-face {
  font-family: 'OpenSans';
  src: url('../font/OpenSans.eot?#iefix') format('embedded-opentype'),  url('../font/OpenSans.woff') format('woff'), url('../font/OpenSans.ttf')  format('truetype'), url('../font/OpenSans.svg#OpenSans') format('svg');
  font-weight: normal;
  font-style: normal;
}

:root {
  --color-primary: #156199;
  --color-primary-hover: #376490;

	--color-secondary: #6c757d;
	--color-secondary-hover: #5e666d;

	--color-success: #198754;
	--color-success-hover: #177c4d;

	--color-danger: #dc3545;
	--color-danger-hover: #be2d3b;

	--color-warning: #ffc107;
	--color-warning-hover: #f1b607;

	--color-info: #0dcaf0;
	--color-info-hover: #0cbde1;

	--color-light: #f8f9fa;
	--color-light-hover: #f4f5f6;

	--color-dark: #212529;
	--color-dark-hover: #1b1e21;

	--color-grey-border: #ffffff;
}

* {
	font-size: 18px;
	line-height: 1.3em;
	font-family: "OpenSans",Arial,sans-serif;
	color: var(--color-dark);
}
@media screen and (max-width: 360px) {
	* {
		font-size: 17px;
	}
}
@media screen and (max-width: 260px) {
	* {
		font-size: 14px;
	}
}

body {
	position: relative;
	margin: 0;
	background-image: url('/img/bg.png');
	background-repeat: repeat;
	padding: 0;
}

div, a {
	box-sizing: border-box;
}

a {
	color: var(--color-primary);
}
a:hover {
	color: var(--color-danger);
}

h1 {
	font-size: 36px;
	margin: 0 0 50px 0;
	text-align: center;
	letter-spacing: 3px;
	font-weight: normal;
}
@media screen and (max-width: 400px) {
	h1 {
		font-size: 28px;
	}
}
@media screen and (max-width: 240px) {
	h1 {
		letter-spacing: 0;
	}
}

p {
	margin: 0 0 15px 0;
	text-align: justify;
	text-indent: 30px;
}
@media screen and (max-width: 320px) {
	p {
		text-align: left;
	}
}

img {
	max-width: 100%;
}

.btn {
	border: 0px solid #ffffff;
	border-radius: 6px;
	padding: 12px 18px 10px 18px;
	font-weight: bold;
	font-size: 16px;
	line-height: 16px;
	max-width: 200px;
	margin: 0 auto;
	height: auto;
	cursor: pointer;
}

.btn-primary {
	background-color: var(--color-primary);
	border: 2px solid var(--color-primary);
	color: #ffffff;
}

.btn-primary:hover {
	background: var(--color-primary-hover);
	border: 2px solid var(--color-primary-hover);
}



.book-wrapper {
	margin: 0 auto;
	width: 100%;
	max-width: 800px;
}



.book-header {
	padding-top: 15px;
	padding-bottom: 10px;
}
@media screen and (max-width: 800px) {
	.book-header {
		padding-left: 15px;
	}
}

	.book-header__link {
		text-decoration: none;
	}



.book-page {
	width: 100%;
	margin-bottom: 30px;
	padding: 50px 40px;
	background: #ffffff;
	border: 1px solid #efefef;
	border-radius: 3px;
	box-shadow: 0 0 6px rgba(100, 100, 100, .05);
	/*box-shadow: 0 0 6px rgba(100, 100, 100, .05), 0 0 20px rgba(100, 100, 100, .05) inset;*/
}
@media screen and (max-width: 800px) {
	.book-page {
		border: none;
		border-radius: 0;
	}
}
@media screen and (max-width: 800px) {
	.book-page {
		padding: 50px 25px;
	}
}
@media screen and (max-width: 640px) {
	.book-page {
		padding: 50px 15px;
	}
}

	img.book-page__image-chapter {
		display: block;
		margin: 0 auto 20px auto;
		width: 100px;
	}

	img.book-page__image-end {
		display: block;
		margin: 40px auto 0 auto;
		width: 30px;
	}

	.book-page__to-be-continued {
		margin: 40px auto 0 auto;
		text-align: center;
		font-style: italic;
		letter-spacing: 2px;
		font-size: 16px;
	}

	p.book-page__definition {
		margin-left: 40px;
		margin-right: 40px;
		margin-bottom: 50px;
		text-indent: 0;
	}
	@media screen and (max-width: 640px) {
		p.book-page__definition {
			margin-left: 20px;
			margin-right: 20px;
		}
	}
	@media screen and (max-width: 320px) {
		p.book-page__definition {
			margin-left: 0;
			margin-right: 0;
		}
	}

	p.book-page__narrow {
		margin-left: 20px;
		margin-right: 20px;
		margin-top: 20px;
		margin-bottom: 20px;
		text-indent: 0;
	}
	@media screen and (max-width: 640px) {
		p.book-page__narrow {
			margin-left: 20px;
			margin-right: 20px;
		}
	}
	@media screen and (max-width: 320px) {
		p.book-page__narrow {
			margin-left: 0;
			margin-right: 0;
		}
	}

	.book-page__initial-letter {
		font-size: 36px;
		line-height: 18px;
	}
	@media screen and (max-width: 640px) {
		.book-page__initial-letter {
			font-size: 28px;
		}
	}



.contents {

}

	img.contents__image {
		display: block;
		margin: 0 auto 20px auto;
		width: 200px;
	}

	h1.contents__title {
		font-size: 32px;
		margin: 0 0 50px 0;
		text-align: center;
		letter-spacing: 3px;
		font-weight: normal;
	}
	@media screen and (max-width: 400px) {
		h1.contents__title {
			font-size: 24px;
		}
	}
	@media screen and (max-width: 240px) {
		h1.contents__title {
			letter-spacing: 0;
		}
	}

	.contents__book {
		margin-bottom: 30px;
	}

		.contents__book-name {
			border-bottom: 2px solid var(--color-dark);
			padding-bottom: 5px;
			margin-bottom: 10px;
			font-weight: bold;
			font-size: 16px;
			letter-spacing: 1px;
		}

		.contents__chapter {
			margin-left: 20px;
			margin-bottom: 8px;
		}

			.contents__chapter-num {
				letter-spacing: 1px;
				font-size: 14px;
			}

			.contents__chapter-line {
				margin-left: 20px;

				display: flex;
				justify-content: space-between;
				align-items: last baseline;
				column-gap: 10px;
			}

				.contents__chapter-name {
					line-height: 1em;
				}

				.contents__chapter-page {

				}