/* --- General body and fonts --- */
body {
  background: #fceec0
    url("https://www.transparenttextures.com/patterns/paper-fibers.png");
  font-family: "Comic Sans MS", "Chalkboard SE", cursive, sans-serif;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

/* --- Book Cover --- */
.book-cover {
  position: fixed;
  inset: 0;
  background: #d6c7a1;
  box-shadow: inset 0 0 30px #a97c50;
  border: 15px solid #a67c52;
  flex-direction: column;
  z-index: 9999;
  user-select: none;
  transition: opacity 0.8s ease;
}

.book-image {
  width: 250px;
  height: auto;
  user-select: none;
  pointer-events: none;
}

.cover-title {
  font-size: 3rem;
  color: #8c5c34;
  text-shadow: 1px 1px #fff;
  user-select: none;
}

/* --- Storybook Container --- */
.storybook-container {
  margin-top: 100px !important;
  width: 90vw;
  max-width: 900px;
  height: 700px;
  margin: 40px auto;
  display: flex;
  perspective: 1500px;
  transform-style: preserve-3d;
  position: relative;
  border: 15px solid #a67c52;
  background: #d6c7a1;
  box-shadow: inset 0 0 30px #a97c50;
  border-radius: 12px;
  overflow: visible;
  user-select: none;
}

/* --- Pages --- */
.page {
  width: 50%;
  height: 100%;
  background: #fff8dc;
  box-shadow: inset 0 0 10px #ccb58c;
  padding: 20px;
  box-sizing: border-box;
  border: 2px dashed #c49a6c;
  border-radius: 0 12px 12px 0;
  backface-visibility: hidden;
  overflow-y: auto;
  font-size: 1rem;
  color: #5b3a29;
}

.book-left-page {
  border-radius: 12px 0 0 12px;
  border-right: 2px solid #c49a6c;
}

.book-right-page {
  border-radius: 0 12px 12px 0;
}

/* --- Titles --- */
.storybook-title {
  font-size: 2.5rem;
  color: #8c5c34;
  text-shadow: 1px 1px #fff;
  user-select: none;
}

/* --- How to Play --- */
.how-to-play {
  background: #fff3d1;
  border: 2px dashed #c49a6c;
  padding: 15px;
  border-radius: 10px;
  font-size: 1rem;
  color: #5b3a29;
}

.how-to-play h5 {
  font-weight: bold;
  margin-bottom: 30px;
  color: #8c5c34;
  text-align: center;
}

.how-to-play ul {
  padding-left: 1.2rem;
  list-style: none;
}

.how-to-play li {
  margin-bottom: 8px;
}

.starttbtn {
  border: 1px solid #8c5c34;
  background-color: #5b3a29;
  font-size: 28px;
  color: white;
  border-radius: 30px;
  padding-top: 10px;
  padding-bottom: 12px;
  padding-left: 40px;
  padding-right: 40px;
}

.starttbtn:hover {
  border: 1px solid #8c5c34;
  background-color: #5b3a29;
  color: white;
}

.rstrt-btn {
  border: 1px solid #8c5c34;
  background-color: #5b3a29;
  color: white;
}

.rstrt-btn:hover {
  border: 1px solid #8c5c34;
  background-color: #5b3a29;
  color: white;
}

/* --- Game Board Cards --- */
.card-container {
  width: 90px;
  height: 90px;
  margin: 10px;
  perspective: 1000px;
  cursor: pointer;
}

.card-inner {
  width: 100%;
  height: 100%;
  transition: transform 0.6s;
  transform-style: preserve-3d;
  position: relative;
  border-radius: 12px;
}

.flipped .card-inner {
  transform: rotateY(180deg);
}

.card-front,
.card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid #a67c52;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.1);
  background: #fff7e6;
  font-size: 2rem;
  user-select: none;
}

.card-front {
  background: #ffe7a3;
}

.card-back {
  transform: rotateY(180deg);
  background: #fff;
}

.card-back img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  user-select: none;
  pointer-events: none;
}

/* --- Page Flip Animation --- */
.storybook-container.open {
  animation: openBookFlip 1.2s forwards;
}

@keyframes openBookFlip {
  0% {
    transform: rotateY(90deg);
    opacity: 0;
  }
  100% {
    transform: rotateY(0deg);
    opacity: 1;
  }
}