/* ===== Notebook page ===== */

.description-page {
  background:#f8d683;
  padding:20px;
  border-radius:20px;
}
.description-page .row.mt-4 { row-gap:18px; }

/* Title bar */
.description-page .page-titlebar.sketch{
  background:var(--panel-gray,#dfe6ea);
  border:3px solid var(--stroke-brown,#b06a3e);
  border-radius:16px;
  padding:20px 28px;
  text-align:center;
}
.description-page .page-titlebar.sketch h1{
  font-size:clamp(40px,5vw,64px);
  font-weight:700;
  letter-spacing:.02em;
  color:var(--title-brown,#9a5632);
  line-height:1.05;
}

/* PDF board */
.description-page .sketch-board{
  background:var(--panel-gray,#dfe6ea);
  border:3px solid var(--stroke-brown,#b06a3e);
  border-radius:36px; padding:0;
  min-height:420px;
  position:relative; overflow:hidden;
}
#pdfFrame{
  width:100%;
  height:85vh;   /* 可按需调整高度 */
  border:0;
  display:block;
}