main.rong { max-width: 1200px; }
.thanh { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 12px;
  background: #fff; border: 1px solid var(--vien); border-radius: 10px; padding: 8px 12px; }
.thanh button { margin: 0; padding: 7px 12px; }
.thanh button:disabled { opacity: .45; cursor: default; }
.thanh .ngan { width: 1px; height: 24px; background: var(--vien); margin: 0 4px; }
.thanh .day { margin-left: auto; }
#thaFile { border: 2px dashed var(--vien); border-radius: 12px; padding: 36px 16px; text-align: center; background: #fff; color: #44505f; }
#thaFile.keo { border-color: var(--nhan); background: #eef4ff; }
#luoi { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); margin-top: 12px; }
.trang { position: relative; background: #fff; border: 2px solid var(--vien); border-radius: 10px; padding: 6px;
  cursor: grab; user-select: none; }
.trang.chon { border-color: var(--nhan); }
.trang .hop { height: 166px; display: grid; place-items: center; background: #e9edf3; border-radius: 6px; overflow: hidden; }
.trang canvas { display: block; background: #fff; box-shadow: 0 1px 4px rgb(0 0 0/.3); transition: transform .15s; }
.trang .ten { font-size: 12px; margin-top: 4px; text-align: center; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.trang .nut { position: absolute; top: 8px; display: none; width: 28px; height: 28px; padding: 0; margin: 0;
  border-radius: 50%; background: #fff; color: var(--chu); border: 1px solid var(--vien); box-shadow: 0 1px 4px rgb(0 0 0/.25); }
.trang:hover .nut, .trang:focus-within .nut { display: block; }
.trang .xoay { left: 8px; } .trang .xoa { right: 8px; color: #c0392b; }
.sortable-ghost { opacity: .35; } .sortable-chosen { cursor: grabbing; }
.danhsach { margin: 10px 0 0; padding: 0; list-style: none; font-size: 14px; }
.danhsach li { display: flex; gap: 8px; align-items: center; padding: 3px 0; }
.danhsach button { padding: 2px 8px; margin: 0; }
.tinh { color: #44505f; font-size: 14px; }
@media (max-width: 640px) { #luoi { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); } .trang .hop { height: 136px; } .trang .nut { display: block; } }

/* Trang Tách PDF: các trang xếp hàng, giữa hai trang có đường cắt nét đứt */
.rongrai main { max-width: 1200px; }
.hang { display: flex; flex-wrap: wrap; row-gap: 26px; margin-top: 26px; }
.muc { display: flex; align-items: stretch; }
.muc .trang { width: 150px; flex: none; cursor: default; border-top: 6px solid var(--seg, var(--vien)); transition: opacity .15s; }
.muc.bo .trang { opacity: .35; }
.muc .trang .nut.xem { display: block; right: 8px; left: auto; top: 12px; }
.cat { position: relative; width: 28px; flex: none; cursor: pointer; background: none; border: 0; padding: 0; margin: 0; border-radius: 0; }
.cat::before { content: ""; position: absolute; top: 4px; bottom: 4px; left: 50%; border-left: 2px dashed #9aa5b5; transform: translateX(-1px); }
.cat .keo { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 26px; height: 26px; border-radius: 50%;
  background: #fff; border: 1px solid var(--vien); display: none; place-items: center; font-size: 15px; color: #c0392b; line-height: 1; }
.cat:hover::before, .cat:focus-visible::before { border-color: var(--nhan); }
.cat:hover .keo, .cat:focus-visible .keo { display: grid; color: var(--nhan); border-color: var(--nhan); }
.cat.dang::before { border-left: 3px dashed #d92d20; transform: translateX(-1.5px); }
.cat.dang .keo { display: grid; color: #d92d20; border-color: #d92d20; }
.cat.cuoi { width: 12px; cursor: default; }
.cat.cuoi::before, .cat.cuoi .keo { display: none; }
.chip { position: absolute; top: -18px; left: 6px; z-index: 2; display: none; background: var(--seg, #555); color: #fff;
  font: 600 12px/1 system-ui, sans-serif; padding: 5px 9px; border-radius: 12px; cursor: pointer; white-space: nowrap; border: 0; margin: 0; }
.muc.dau .chip { display: block; }
.muc.bo .chip { background: #8a94a3; text-decoration: line-through; }
.chip::after { content: " ✓"; } .muc.bo .chip::after { content: " (bỏ qua)"; }
.tomtat { position: sticky; bottom: 0; background: #fff; border: 1px solid var(--vien); border-radius: 10px; padding: 10px 14px; margin-top: 18px;
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center; box-shadow: 0 -2px 10px rgb(0 0 0/.08); }
.tomtat button { margin: 0; padding: 8px 14px; }
dialog#xemTo { border: 0; border-radius: 12px; padding: 12px; max-width: min(94vw, 900px); width: 100%; background: #fff; color: var(--chu); }
dialog#xemTo::backdrop { background: rgb(0 0 0 / .6); }
dialog#xemTo .dau-hop { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 8px; }
dialog#xemTo .khung-to { max-height: 70vh; overflow: auto; background: #e3e7ee; border-radius: 8px; text-align: center; padding: 8px; }
dialog#xemTo canvas { max-width: 100%; height: auto; background: #fff; box-shadow: 0 2px 10px rgb(0 0 0/.3); }
dialog#xemTo button { margin: 0; padding: 7px 12px; }

body.dangKeo::after { content: 'Thả file PDF vào đây'; position: fixed; inset: 12px; display: grid; place-items: center; font-size: 22px; font-weight: 600;
  color: var(--nhan); background: rgb(238 244 255 / .9); border: 3px dashed var(--nhan); border-radius: 12px; z-index: 50; pointer-events: none; }