@import url('https://fonts.googleapis.com/css2?family=Merriweather:wght@400;700&display=swap');

.notebook-container {
  width: 100%;
  height: 95vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #e0e0e0;
  font-family: 'Merriweather', serif;
  position: relative;
}

.book {
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 1500px;
}

.page {
  position: relative;
  width: 50%;
  padding-bottom: 70.7%;
  background-color: #fffbf0;
  border: 1px solid #e0e0e0;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
  animation: fadeIn 0.5s ease-in-out;
  display: flex;
  justify-content: center;
  align-items: center;
}

.page-inner {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 2em;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow-y: auto;
}

.page-content {
  margin: 10px;
  flex-grow: 1;
  font-size: 1.2vw;
  line-height: 1.6;
}

.notebook-header,
.notebook-footer {
  text-align: center;
  font-size: 0.8rem;
  color: #888;
}

.notebook-cover {
  position: relative;
  width: 50%;
  padding-bottom: 70.7%; /* 50% * 1.414 */
  background-color: #d2b48c; /* Light Brown */
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 2rem;
  color: white;
  font-weight: bold;
  border-left: 2px solid rgba(0, 0, 0, 0.1);
}

.notebook-cover .page-inner h2 {
  border-bottom: 2px solid rgba(255, 255, 255, 0.5);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}

.notebook-cover::before,
.notebook-cover::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: rgba(0, 0, 0, 0.1);
}

.notebook-cover::before {
  left: 10px;
}

.notebook-cover::after {
  left: 20px;
}

.clickable-edge {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 15%;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #333;
  transition: color 0.3s;
  z-index: 10;
}

.clickable-edge:hover {
  color: #000;
}

.notebook-cover .author,
.notebook-cover .date {
  font-size: 1rem;
  font-weight: normal;
  position: absolute;
  bottom: 2rem;
  right: 2rem;
  color: #5a4d3c;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

.notebook-cover .author {
  bottom: 4rem;
}

.clickable-edge.left {
  left: -5%;
}

.clickable-edge.right {
  right: -5%;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.slider-container {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  width: 50%;
  max-width: 500px;
  text-align: center;
}

.page-number-display {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: #555;
}

.slider {
  -webkit-appearance: none;
  width: 100%;
  height: 15px;
  border-radius: 5px;
  background: #d3d3d3;
  outline: none;
  opacity: 0.7;
  -webkit-transition: 0.2s;
  transition: opacity 0.2s;
  border: 1px solid #888;
}

.slider:hover {
  opacity: 1;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #5a4d3c;
  cursor: pointer;
  border: 1px solid #333;
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #5a4d3c;
  cursor: pointer;
  border: 1px solid #333;
}

@media (max-width: 1279px) {
  .book {
    width: min(90vw, 90vh / 1.414);
    height: calc(min(90vw, 90vh / 1.414) * 1.414);
  }
  .page,
  .notebook-cover {
    width: 100%;
    height: 100%;
  }
  .slider-container {
    width: 80%;
  }

  .page-content {
    font-size: 1.2rem;
  }
}

@media (min-width: 1280px) {
  .book {
    width: min(80vw, 80vh * 1.414);
    height: calc(min(80vw, 80vh * 1.414) / 1.414);
  }

  .page-content {
    font-size: 1.1rem;
  }
}