* { box-sizing: border-box; }

/* FlipBook */

body {
  margin: 0;
  display: flex;
  /* min-height: 100dvh; */
  /* perspective: 1000px; */
  font: 1em/1.4 "Poppins", sans-serif;
  overflow: hidden;
  color: hsl(180 68% 5%);
  background-image: radial-gradient(circle farthest-corner at 50% 50%, hsl(187 20% 88%) 30%, hsl(149 20% 94%) 100%);
}

.book {
  position: relative;
  display: flex;
  margin: auto;
  width: 50cqmin;
  pointer-events: none;
  transform-style: preserve-3d;
  transition: translate 1s;
  translate: calc(min(var(--c), 1) * 50%) 0%;
  rotate: 1 0 0 30deg;
  rotate: 1 0 0 30deg;
}

.page {
  --thickness: 4;
  flex: none;
  display: flex;
  width: 100%;
  font-size: 2cqmin;
  pointer-events: all;
  user-select: none;
  transform-style: preserve-3d;
  transform-origin: left center;
  transition:
    transform 1s,
    rotate 1s ease-in calc((min(var(--i), var(--c)) - max(var(--i), var(--c))) * 50ms);
  translate: calc(var(--i) * -100%) 0px 0px;
  transform: translateZ( calc((var(--c) - var(--i) - 0.5) * calc(var(--thickness) * .23cqmin)));
  rotate: 0 1 0 calc(clamp(0, var(--c) - var(--i), 1) * -180deg);
}

.front,
.back {
  position: relative;
  flex: none;
  width: 100%;
  backface-visibility: hidden;
  overflow: hidden;
  background-color: #fff;
  translate: 0px;
}

.back {
  translate: -100% 0;
  rotate: 0 1 0 180deg;
}

.book {
  counter-reset: page -1;
  & a {
    color: inherit;
  }
}

.front,
.back {
  display: flex;
  flex-flow: column wrap;
  justify-content: space-between;
  padding: 2em;
  border: 1px solid #0002;
  
  &:has(img) {
    padding: 0;
  }
  
  & img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  
  &::after {
    position: absolute;
    bottom: 1em;
    counter-increment: page;
    content: counter(page) ".";
    font-size: 0.8em;
  }
}
.cover {
  &::after {
    content: "";
  }
}
.front {
  &::after {
    right: 1em;
  }
  background: linear-gradient(to left, #f7f7f7 80%, #eee 100%);
  border-radius: .1em .5em .5em .1em;
}
.back {
  &::after {
    left: 1em;
  }
  background-image: linear-gradient(to right, #f7f7f7 80%, #eee 100%);
  border-radius: .5em .1em .1em .5em;
}


.cover h1, p, h2 {
  opacity: 0;
}

.back-button i{
    position: absolute;
    top: 90%;
    right: 52%;
}
.next-button i{
    position: absolute;
    top: 90%;
    right: 48%;
}
.cover, .front, .back {
    width: 100%;
    height: auto;
}


@media only screen and (max-width: 550px) {
  .book {
    /* transform: rotate(90deg); */
    /* translate: calc(min(var(--c), 1)* 0%) 50%; */
    rotate: 0 1 0 10deg;
  }
  .back-button i{
    transform: rotate(90deg);
  }
}
.zoom-controls {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    gap: 10px;
}

.zoom-controls button {
    padding: 10px 15px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    background-color: #007bff;
    color: white;
    border-radius: 5px;
}

.zoom-controls button:hover {
    background-color: #0056b3;
}

.button {
    position: absolute;
    top: 90%;
    right: 10%;
}
.button i{
    color: white;
    background-color: #238d01;
    border-radius: 20px;
    padding: 7px;
}