/* PDF在线阅读器 - 前端样式（响应式、保持可读性、明暗自适应） */
.pdfreader {
  --pr-bg: #f4f5f7;
  --pr-card: #ffffff;
  --pr-ink: #1f2329;
  --pr-ink-2: #646a73;
  --pr-line: #e6e8eb;
  --pr-accent: #2f6bff;
  --pr-accent-ink: #ffffff;
  --pr-shadow: 0 1px 3px rgba(0, 0, 0, .06), 0 8px 24px rgba(0, 0, 0, .06);
  position: relative;
  margin: 22px 0;
  background: var(--pr-card);
  border: 1px solid var(--pr-line);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--pr-shadow);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--pr-ink);
}
.pdfreader__bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: linear-gradient(180deg, #fbfbfc, #f5f6f8);
  border-bottom: 1px solid var(--pr-line);
  flex-wrap: wrap;
}
.pdfreader__title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--pr-ink);
  min-width: 0;
  flex: 1 1 200px;
}
.pdfreader__title svg { flex: 0 0 auto; color: #e2483d; }
.pdfreader__title span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.pdfreader__tools {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.pdfreader__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  padding: 0 10px;
  font-size: 13px;
  line-height: 1;
  color: var(--pr-ink);
  background: var(--pr-card);
  border: 1px solid var(--pr-line);
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s, border-color .15s, color .15s;
  user-select: none;
}
.pdfreader__btn:hover {
  background: #eef1f6;
  border-color: #d6dadf;
}
.pdfreader__btn:active { transform: translateY(1px); }
.pdfreader__link { color: var(--pr-accent); }
.pdfreader__link:hover { color: var(--pr-accent); background: #eaf1ff; border-color: #cfe0ff; }
.pdfreader__page, .pdfreader__zoom {
  font-size: 13px;
  color: var(--pr-ink-2);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  padding: 0 2px;
}
.pdfreader__page b { color: var(--pr-ink); font-weight: 600; }
.pdfreader__sep {
  width: 1px;
  height: 18px;
  background: var(--pr-line);
  margin: 0 2px;
}
.pdfreader__scroll {
  background: var(--pr-bg);
  overflow: auto;
  max-height: 720px;
  padding: 16px;
  -webkit-overflow-scrolling: touch;
}
.pdfreader__pages {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.pdfreader__pagebox {
  background: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, .12), 0 6px 18px rgba(0, 0, 0, .08);
  border-radius: 2px;
  line-height: 0;
  max-width: 100%;
}
.pdfreader__pagebox canvas { display: block; max-width: 100%; height: auto; }
.pdfreader__msg {
  padding: 26px 16px;
  text-align: center;
  color: var(--pr-ink-2);
  font-size: 14px;
}
.pdfreader__bar[hidden], .pdfreader__btn[hidden] { display: none !important; }
.pdfreader--notoolbar .pdfreader__bar { display: none; }

/* 窄屏 */
@media (max-width: 600px) {
  .pdfreader__bar { padding: 8px 10px; }
  .pdfreader__title { flex-basis: 100%; }
  .pdfreader__tools { width: 100%; }
  .pdfreader__scroll { padding: 10px; max-height: 62vh; }
}

/* 暗色模式：容器保持"文档"白底观感，仅外壳与工具栏随系统微暗化 */
@media (prefers-color-scheme: dark) {
  .pdfreader {
    --pr-bg: #2a2d33;
    --pr-card: #202327;
    --pr-ink: #e8eaed;
    --pr-ink-2: #9aa0a8;
    --pr-line: #35393f;
    --pr-shadow: 0 1px 3px rgba(0, 0, 0, .4), 0 10px 28px rgba(0, 0, 0, .35);
  }
  .pdfreader__bar { background: linear-gradient(180deg, #24272c, #1d2024); }
  .pdfreader__btn { background: #2a2e34; }
  .pdfreader__btn:hover { background: #33373e; border-color: #444a52; }
  .pdfreader__link { color: #6ea0ff; }
  .pdfreader__link:hover { background: #1f2c44; border-color: #2c3f63; }
}