@import url("https://fonts.googleapis.com/css?family=Cormorant+Garamond:300,400,600|Tulpen+One&display=swap");
:root {
  --body-bg: #fafafa;
  --page-bg: #f5f5f5;
  --dark-text: #2a2935;

  --baseline: 12px;

  --book-title: "Tulpen One", sans-serif;
  --title: "Cormorant Garamond", serif;
  --body: "Cormorant Garamond", serif;
  --base-size: var(--baseline) * 1.2;
}

* {
  box-sizing: border-box;
}

body {
  background-color: var(--body-bg);
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.cover {
  width: calc(var(--baseline) * 60);
  height: calc(var(--baseline) * 42.6);
  box-shadow: 0 0 100px rgba(0, 0, 0, 0.3);
}

.book {
  width: 100%;
  height: 100%;
  display: flex;
  perspective: 1200px;
}
.bookpg {
  position: relative;
  width: 50%;
  height: 100%;
  display: grid;
  transform: rotateY(0deg);
  transition: transform 0.9s cubic-bezier(0.645, 0.045, 0.355, 1);
  transform-origin: 0% 0%;
  background-color: var(--page-bg);
  background-image: linear-gradient(90deg, #e3e3e3 0%, rgba(247, 247, 247, 0) 18%);
}
.bookpg:nth-of-type(1) {
  background-image: linear-gradient(-90deg, #e3e3e3 0%, rgba(247, 247, 247, 0) 18%);
}
.bookpg1 {
  cursor: pointer;
  overflow: hidden;
}
.bookpg2 {
  position: absolute;
  right: 0;
  pointer-events: none;
  transform-style: preserve-3d;
  background-color: var(--page-bg);
  background-image: linear-gradient(90deg, #e3e3e3 0%, rgba(247, 247, 247, 0) 18%);
}
.bookpg4{
  cursor: pointer;
  padding: 0 calc(var(--baseline) * 3);
}
.front {
  position: absolute;
  width: 100%;
  height: 100%;
  transform: rotateY(0deg) translateZ(1px);
}
.back {
  position: absolute;
  width: 100%;
  height: 100%;
  padding: 0 calc(var(--baseline) * 1.8);
  transform: rotateY(180deg) translateZ(1px);
}
.bookpg .pgcon {
  padding: var(--baseline);
  height: 100%;
  position: relative;
  text-align: center;
}
.bookpg .book-title {
  font-family: var(--book-title);
  font-size: calc(var(--base-size) * 3);
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--dark-text);
  margin-top: calc(var(--baseline) * 5);
  margin-bottom: calc(var(--baseline) * 2);
}

.bookpg .credits {
  font-family: var(--title);
  text-transform: uppercase;
  font-size: calc(var(--base-size) * 0.8);
  margin-bottom: calc(var(--baseline) * 2);
  letter-spacing: 1px;
}
.bookpg .title {
  font-family: var(--title);
  font-size: calc(var(--base-size) * 1);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: calc(var(--baseline) * 5);
  margin-bottom: calc(var(--baseline) * 3);
}
.bookpg .blockquote {
  margin-bottom: calc(var(--baseline) * 2);
}
.bookpg .blockquote-text {
  font-family: var(--title);
  font-size: calc(var(--base-size) * 0.67);
  font-style: italic;
  text-align: justify;
}
.bookpg .blockquote-reference {
  font-family: var(--title);
  font-size: calc(var(--base-size) * 0.7);
  margin-top: calc(var(--baseline) * 0.3);
  float: right;
  text-transform: uppercase;
}
.bookpg .pgnum {
  position: absolute;
  bottom: var(--baseline);
  width: calc(100% - (var(--baseline) * 2));
  font-family: var(--title);
  font-size: calc(var(--base-size) * 0.67);
  text-align: center;
}
.book input[type=radio] {
  display: none;
}
.book input[type=radio]:checked + .bookpg {
  transition: transform 0.9s cubic-bezier(0.645, 0.045, 0.355, 1);
  transform: rotateY(-180deg);
}