/**
 * StPdfViewer — 前台全螢幕 PDF 檢視器（PDF.js canvas 渲染）
 * Editorial Civic 設計：深墨 backdrop / 紙白圓 X / 金色 hover
 * 每頁畫到 canvas，直向堆疊可捲動；不受瀏覽器原生 PDF 設定影響
 */

:root {
  --st-pv-backdrop:       rgba(26, 21, 48, 0.92);
  --st-pv-close-bg:       var(--paper, #F8F4ED);
  --st-pv-close-color:    var(--ink-deep, #1A1530);
  --st-pv-close-bg-hover: var(--gold-soft, #E8D7A8);
  --st-pv-close-border:   rgba(200, 164, 92, 0.6);
  --st-pv-radius:         999px;
  --st-pv-z:              11000; /* 與 StImageViewer 同層 */
  --st-pv-ease:           var(--ease-out, cubic-bezier(0.16, 1, 0.3, 1));
}

.st-pdfviewer {
  position: fixed;
  inset: 0;
  z-index: var(--st-pv-z);
  display: flex;
  align-items: stretch;
  justify-content: center;
  background: var(--st-pv-backdrop);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s var(--st-pv-ease);
}

.st-pdfviewer.is-open {
  opacity: 1;
  pointer-events: auto;
}

/* 捲動區：填滿 overlay，直向捲動 */
.st-pdfviewer__scroll {
  width: 100%;
  height: 100vh;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

/* 頁面堆疊容器：置中、頁間距 */
.st-pdfviewer__pages {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 24px 16px 64px;
  min-height: 100%;
}

/* 單頁 canvas：紙白底、陰影、圓角；不超出容器寬 */
.st-pdfviewer__page {
  display: block;
  max-width: 100%;
  height: auto;
  background: #fff;
  border-radius: 2px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

/* 載入失敗提示 */
.st-pdfviewer__error {
  margin: auto;
  text-align: center;
  color: var(--paper, #F8F4ED);
  font-family: var(--font-display, "Noto Serif TC", serif);
}
.st-pdfviewer__error a {
  display: inline-block;
  margin-top: 12px;
  color: var(--gold, #C8A45C);
  text-decoration: underline;
}

.st-pdfviewer__close {
  position: absolute;
  top: clamp(14px, 2.2vw, 32px);
  right: clamp(14px, 2.2vw, 32px);
  width: 48px;
  height: 48px;
  border: 1px solid var(--st-pv-close-border);
  border-radius: var(--st-pv-radius);
  background: var(--st-pv-close-bg);
  color: var(--st-pv-close-color);
  font-size: 24px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.45);
  transition: transform 0.18s var(--st-pv-ease),
              background 0.18s var(--st-pv-ease),
              color 0.18s var(--st-pv-ease);
}

.st-pdfviewer__close:hover,
.st-pdfviewer__close:focus {
  background: var(--st-pv-close-bg-hover);
  color: var(--st-pv-close-color);
  transform: scale(1.08);
  outline: none;
}

.st-pdfviewer__close:active {
  transform: scale(0.96);
}

/* 載入中文字（iframe 還在拉檔時顯示） */
.st-pdfviewer__loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--paper, #F8F4ED);
  font-family: var(--font-display, "Noto Serif TC", serif);
  font-size: 14px;
  letter-spacing: 0.06em;
  pointer-events: none;
  opacity: 0.8;
}

.st-pdfviewer.is-loaded .st-pdfviewer__loading { display: none; }

/* 可預覽 PDF 連結的 cursor 提示 */
.st-pdfviewer-target {
  cursor: zoom-in;
}

@media (max-width: 575.98px) {
  .st-pdfviewer__close { width: 42px; height: 42px; font-size: 20px; }
  .st-pdfviewer__pages { padding: 16px 8px 48px; gap: 12px; }
}