/* ref.css */
@import url("index.css"); /* 引入統一樣式 */

body {
  background-color: var(--body-bg);
  color: var(--text-dark);
  overscroll-behavior: none; /* 防止手機上的過度滾動 */
}

#pdfContent h1 {
  font-size: 2rem;
  color: var(--bs-primary);
}

#category-list .list-group-item {
  cursor: pointer;
  transition: all 0.2s ease-in-out;
}

#category-list .list-group-item:hover,
#category-list .list-group-item.active {
  background-color: var(--bs-primary);
  color: white;
}

.pdf-list-container .card {
  border: 1px solid #dee2e6;
  transition: box-shadow 0.3s ease;
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.pdf-list-container .card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.pdf-canvas {
  max-width: 100%;
  width: 100%;
  height: auto;
  display: block;
  touch-action: pan-y pinch-zoom; /* 支援觸控滑動和縮放 */
}

.pdf-viewer {
  user-select: none;
  background: #fff;
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow-y: auto; /* 允許垂直滾動 */
  -webkit-overflow-scrolling: touch; /* iOS平滑滾動 */
}

.pdf-viewer .card-body {
  flex-grow: 1;
  padding: 10px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.pdf-pages {
  width: 100%;
  max-width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.pdf-navigation {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
}

.page-info {
  font-size: 0.9rem;
  color: #666;
}

/* 手機版調整 */
@media (max-width: 767.98px) {
  .pdf-list-container .row-cols-md-2 {
    display: flex;
    flex-direction: column; /* 垂直排列卡片 */
  }

  .pdf-viewer .card-body {
    max-height: 80vh; /* 限制卡片高度 */
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .pdf-canvas {
    width: 100%;
    max-width: 100%;
  }

  .pdf-navigation {
    position: sticky;
    bottom: 10px;
    background: rgba(255, 255, 255, 0.9); /* 半透明背景 */
    padding: 5px;
    border-radius: 5px;
  }
}

.pagination {
  display: flex;
  justify-content: center; /* 水平居中 */
  align-items: center; /* 垂直居中 */
  gap: 0.5rem; /* 統一間距，替代mx-3 */
  margin-top: 2rem;
  width: 100%; /* 確保佔據父容器寬度 */
}

.pagination .btn {
  min-width: 80px; /* 確保按鈕寬度一致 */
  text-align: center;
}

.pagination #pageInfo {
  min-width: 100px; /* 確保文字區域有固定寬度 */
  text-align: center; /* 文字本身居中 */
  margin: 0; /* 移除mx-3的影響 */
}

@media (max-width: 767.98px) {
  .pagination {
    flex-direction: row;
    gap: 0.5rem;
  }

  .pagination #pageInfo {
    min-width: 80px; /* 手機上稍微縮小 */
  }
}