/**
 * 教材 PDF 打印加速。
 *
 * 慢的主因不是 UTF-8 页面编码，而是 Chrome「另存为 PDF」把站酷快乐体 /
 * 马善政等 CJK 手写网字体按 Identity-H CID 整包（或大子集）嵌进 PDF。
 * 学校打印机 RIP 解析这类轮廓极慢。打印时改用系统黑体/雅黑，英文手写
 * 仍用较小的 Patrick Hand。
 */
:root {
  --print-hand-en: "Patrick Hand", "Comic Sans MS", cursive;
  --print-hand-zh: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", "Source Han Sans SC", "Heiti SC", "SimHei", sans-serif;
  --print-hand: "Patrick Hand", "Microsoft YaHei", "PingFang SC", "Noto Sans SC", "Source Han Sans SC", "Heiti SC", "SimHei", sans-serif;
}

@media print {
  :root {
    --hand-en: var(--print-hand-en);
    --hand-zh: var(--print-hand-zh);
    --hand: var(--print-hand);
  }

  html, body,
  .hand, .print-root, .wb-app, .sheet, .book-sheet, .book-playful,
  .lab, .lab-hand, .lab-print, .zh, .bk-title, .bk-kicker, .bk-section,
  .bk-phrase, .bk-words, .bk-caption, .sh-title, .sh-kicker, .task,
  .model-title, .model-hint, .name-row, .foot, .bk-foot, .pack, .batch-letter {
    font-family: var(--print-hand) !important;
  }

  .sheet {
    background: #fffef8 !important;
    box-shadow: none !important;
    filter: none !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
  }
  .sheet.theme-sky { background: #f4f9ff !important; }
  .sheet.theme-leaf { background: #f3faf4 !important; }
  .sheet.theme-candy { background: #fff6f8 !important; }

  /*
   * 教具卡前三页（大写 / 小写 / Aa）是白字海报。
   * 上面把所有 .sheet 压成米色后，字母和副标题会变成“幽灵白字”。
   * 打印改用纯色底，避免渐变，同时让白字重新可见。
   */
  .sheet.theme-poster-a {
    background: #e53935 !important;
  }
  .sheet.theme-poster-s {
    background: #2e7d32 !important;
  }
  .sheet.theme-poster {
    background: #ef6c00 !important;
  }
  .sheet.theme-poster-a .letter-poster,
  .sheet.theme-poster-s .letter-poster,
  .sheet.theme-poster .letter-poster {
    color: #fff !important;
  }
  .sheet.theme-poster-a .foot,
  .sheet.theme-poster-s .foot,
  .sheet.theme-poster .foot {
    color: rgba(255, 255, 255, 0.92) !important;
  }
  .sheet.theme-poster-a,
  .sheet.theme-poster-s,
  .sheet.theme-poster {
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
    display: flex !important;
    flex-direction: column !important;
  }
  .letter-poster {
    flex: 1 1 auto !important;
    height: auto !important;
    min-height: 0 !important;
    padding: 6mm 4mm 16mm !important;
    box-sizing: border-box;
    gap: 5mm !important;
  }
  .letter-poster .giant {
    font-size: 72mm !important;
    line-height: 1 !important;
    max-width: 170mm;
    padding: 4mm 0 22mm !important;
  }
  .letter-poster .sub {
    color: inherit !important;
    position: relative;
    z-index: 1;
    max-width: 170mm;
    margin-top: 0 !important;
    line-height: 1.2;
    overflow-wrap: anywhere;
  }
  .letter-poster img {
    position: relative;
    z-index: 1;
  }

  .sheet,
  .sheet * {
    filter: none !important;
    mix-blend-mode: normal !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    text-shadow: none !important;
  }

  img.stave-ghost-cv {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    object-fit: fill;
  }

  body.is-batch-print .batch-root,
  body.is-batch-print .batch-letter.pack {
    display: block !important;
  }
}

html.is-print-export body,
body.is-print-export {
  --hand-en: var(--print-hand-en);
  --hand-zh: var(--print-hand-zh);
  --hand: var(--print-hand);
}