.main{
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

.img_1 img {
  max-width: 100%;    
  width: 100%;
  max-width: 900px;   
  height: auto;       
  display: block;     /* ブロック要素にして margin 自動を有効に */
  margin: 0 auto;     /* 中央揃え */
  box-sizing: border-box; /* padding や border 込みの幅制御 */
  overflow-x: hidden;  /* 横スクロールを防ぐ */
}

header {
  margin-bottom: 40px;
  margin: 0 auto;
}

.logo {
  opacity: 0;
  width: 60px;
  margin-bottom: 20px;
}

.content-intro{
  margin-top:10rem;
  text-align:center
}

.book-disc{
  margin-top:10rem;
}

.content-intro img{
 width:200px;
 height: auto;
 margin-bottom: 5rem;
}

.number-wrapper{
  text-align: center;
}

.number {
  display: inline-block; 
  padding: 0.5em  2em;    
  border: 1px solid #333; 
  border-radius: 9999px;
  font-size: 1rem;
  margin-bottom:2rem;
}

h1 {
  font-size: 24px;
  margin-bottom: 10px;
  font-weight: normal;
}

.slider-book-container {
  overflow: hidden;
  position: relative;
  max-width: 100%;
  margin: 0 auto;
}

.slider-book {
  display: flex;
  transition: transform 0.5s ease-in-out;
  margin-top: 60px;
  min-width: 100%;
  flex-shrink: 0;
}

.slide-book {
  min-width: 100%;      /* 1枚あたり画面幅にフィット */
  height: auto;
  display: block;
  object-fit: contain;
}


.indicator {
  margin-top: 20px;
  justify-content: center; 
  display: flex;
  gap: 8px;
  z-index: 1000;
}

.indicator-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #bbb;
  transition: background-color 0.3s;
}

.indicator-dot.active {
  background-color: #333;
}

.nav {
  position: absolute;
  top: 50%;
  /* transform: translateY(-50%); */
  font-size: 2rem;
  border: none;
  padding: 10px;
  cursor: pointer;
  z-index: 1;
  background: none;
}

.nav img{
  width:15px;
}

.left {
  left: 10px;
}

.right {
  right: 10px;
}

.author {
  font-size: 16px;
  margin-bottom: 15px;
}

.subtitle {
  font-size: 12px;
  color: #666;
  margin-bottom: 20px;
  line-height: 1.5;
}

section {
  margin-bottom: 40px;
}

.book-disc {
  margin-top: 40px;
}

section p {
  width:90%;
}

.author-info {
  margin-bottom: 15px;
}

.profession {
  font-size: 12px;
  color: #666;
  margin-bottom: 15px;
}

/* Responsive adjustments */
@media (max-width: 1300px) {
  body {
      padding: 15px;
  }

  main{
    padding-left: 2rem;
    padding-right: 2rem;
  }
  
  
  h1 {
      font-size: 20px;
  }
  
  h2 {
      font-size: 18px;
  }
  
  .image-placeholder {
      height: 150px;
  }

  .slider-book {
  margin-top: 100px;
}
}