.cover {
  position: relative;
  text-align: center;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: rgb(0 0 0 / 50%); 
  z-index: 1000;
}

.cover-image {
  width: 100%;
  height: auto;
  max-height: 100vh;
  opacity: 0.6;
}

.cover-title {
  position: absolute;
  color: white;
  font-family: 'Playfair Display', serif;
  font-size: 3rem;
  font-weight: 700;
  text-align: center;
  z-index: 1000;
  top: 30%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-shadow: 2px 2px 4px rgb(0 0 0/ 70%);
  letter-spacing: 1px;
}

.cover-subtitle {
  font-family: Lora, serif;
  font-size: 1.4rem;
  font-weight: 500;
  color: rgb(255 255 255);
  margin: 0.5rem 0;
  position: absolute;
  top: 45%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1000;
  text-shadow: 1px 1px 3px rgb(0 0 0/ 60%);
  font-style: italic;
}

.cover-author {
  font-family: Lora, serif;
  font-size: 1.1rem;
  font-weight: 400;
  color: rgb(255 255 255);
  position: absolute;
  top: 53%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1000;
  text-shadow: 1px 1px 2px rgb(0 0 0/ 50%);
  letter-spacing: 0.5px;
}


body {
  margin: 0;
  border-width: 0;
  box-sizing: border-box;
  min-height: 100vh;
  font-family: Lora, serif;
  background-color: antiquewhite;
}

.overview h2 { 
  text-align: center; 
  font-family: 'Playfair Display', 
  serif; font-size: 2.5rem; 
  font-weight: 600; 
  color: rgb(14 0 0); 
  margin-bottom: 1.5rem; 
  text-shadow: 2px 2px 4px rgb(0 0 0/ 20%); 
} 

.overview p { 
  font-family: Lora, serif; 
  font-size: 1.2rem; 
  line-height: 1.6; 
  color: rgb(15 0 0); 
  max-width: 800px; 
  margin: 0 auto; 
  text-shadow: 1px 1px 2px rgb(0 0 0/ 0%); 
  margin-bottom:10vh; 
}

.acknowledgment {   
  height: 100vh;  
  width: 100%;    
  background: linear-gradient(180deg,  rgb(66 77 92),rgb(67 92 92/ 74%));   
  border: none;
  margin: 0;
  padding: 1%;
  padding-left:5%;
  box-sizing: border-box;
  color:#fff;
}

.acknowledgment h2 {
  font-size: 1.5rem; 
}

.acknowledgment li {
  color:#ffffffcb;
  font-size: 0.8rem;
}

.header-emph {
  font-family:'Courier New', Courier, monospace;
  color: #059f03;
  font-weight: 700;
}

.header-emph1 {
  font-family:'Courier New', Courier, monospace;
  color: #042cb0;
  font-weight: 700;
}

.important-intext {
  font-weight: bold;
  color: #4CAF50;
}

.important-intext-level2 {
  font-weight: bold;
  color: #042cb0;
}

.moving-intext {
  font-weight: bold;
  color: #5504f6;
}

.moving-intext-level2 {
  font-weight: bold;
  color: #2302a8;
}

.credits{
  font-size:0.5rem;
  color:gray;
  font-style:italic;
  margin-top:-1rem;
  margin-bottom:1rem;
  display:block;
}

.map-container {
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 0;
}

.map {
  height: 100%;
}

.slide-section {
  position: relative;
  margin-top: -30vh;
  z-index: 100;
  pointer-events: none;
  border-bottom: 1px solid rgb(0 0 0 / 10%);
}

.slide {
  margin-top: 90vh;
  margin-bottom: 90vh;
  margin-left: auto;
  margin-right: 2rem;
  padding: 2rem;
  box-shadow: -0.5rem 0 2rem rgb(0 0 0 / 40%), 0 8px 32px rgb(0 0 0 / 20%);
  border: none;
  border-radius: 1rem;
  pointer-events: initial;
  width: 25rem;
  background: rgb(255 255 255 / 95%);
  color: #2d3748;
  transition: all 0.3s ease;
}

.slide:hover {
  transform: translateY(-5px);
  box-shadow: -0.5rem 0 3rem rgb(0 0 0 / 50%), 0 12px 40px rgb(0 0 0 / 25%);
}

.slide h2 {
  font-family: 'Playfair Display', serif;
  font-size: 1.8rem;
  font-weight: 600;
  color: #1a202c;
  margin-bottom: 1rem;
  letter-spacing: 0.5px;
}

.slide p {
  font-family: Lora, serif;
  font-size: 1rem;
  line-height: 1.7;
  color: #4a5568;
  margin-bottom: 1rem;
}

.slide:first-child {
  margin-top: 0;
}

.slide:last-child {
  margin-bottom: 40vh;
}

.slide-controls {
  display: flex;
  justify-content: space-around;
  align-items: center;
  column-gap: 0.5rem;

  width: 100%;
}

.slide-nav-button {
  transition: all 0.1s;
  padding: 0;
  margin: 1rem;
  width: 4rem;
  height: 3rem;
  border: 1px solid #888;
  border-radius: 0.25rem;

  background-color: #eee;
  font-size: 1.5em;
}

.slide-nav-button:hover {
  background-color: #444;
  color: #fff;
}

.slide-nav-select {
  min-width: 0;
}

.inline-image {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1rem auto;
  border-radius: 0.5rem;
  box-shadow: 0 4px 16px rgb(0 0 0 / 20%);
}

.slide-icon {
  width: 48px;
  height: 48px;
  float: right;
  margin-left: 1rem;
  margin-bottom: 0.5rem;
  opacity: 0.9;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.slide-icon:hover {
  transform: scale(1.1);
  opacity: 1;
}

ul {
  padding-left: 1.3rem;
  text-align: left;
  font-family: Lora, serif;
  font-size: 0.9rem;
  line-height: 1.5;
  color: #4a5568;
}

.li-explain{
  font-style: italic;
  font-size: 0.7rem;
  color: #0546b7;
}

.background-images {
  position: sticky;       /* stick it to the viewport */
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;         
  z-index: -1;           
}

.background-images img {
  width: 100%;
  height: 100%;
  object-fit: cover; 
  opacity: 0.95;
}

@media screen and (width < 480px) {
  .cover-title {
    font-size: 1.5rem;
  }

  .cover-image{
    height: 100vh;
    object-fit: cover;
  }

  .cover-subtitle {
    font-size: 1rem;
  }

  .cover-author {
    font-size: 0.8rem;
  }

  .overview {
    margin: 1rem;
    min-height: 50vh;
  }

  .overview-overlay {
    padding: 2rem 1rem;
  }

  .overview h2 {
    font-size: 2rem;
  }

  .overview p {
    font-size: 1rem;
  }

  .slide {
    width: 20rem;
    margin-right: 1rem;
    padding: 1.5rem;
  }

  .slide h2 {
    font-size: 1.5rem;
  }

  .slide p {
    font-size: 0.9rem;
  }

  .acknowledgment {
    padding: 2rem 1rem;
  }

  .acknowledgment h2 {
    font-size: 2rem;
  }

  .acknowledgment p {
    font-size: 1rem;
  }
}