/* CO-CHU-0311 */
/* Khuôn trình bày tài liệu RQX (dùng cho cả đọc online và in PDF) */
.doc { --navy: #0B1B3F; --blue: #1E3A8A; --blue2: #2D5BD7; --red: #105DC8; --gold: #60A5FA; --muted: #64748B; --line: #E2E8F0;
  font-family: Arial, "Segoe UI", Arial, sans-serif; color: #1F2937; line-height: 1.7; font-size: 15px; }
.doc .zh, .doc .ex .zh { font-family: "Noto Serif SC", "SimSun", "KaiTi", serif; }
.doc h2 { color: var(--navy); font-size: 20.5px; border-bottom: 3px solid var(--red); padding-bottom: 6px; margin: 34px 0 14px; }
.doc h3 { color: var(--blue); font-size: 18px; margin: 24px 0 8px; }
.doc h4 { color: var(--navy); font-size: 16px; margin: 16px 0 6px; }
.doc .py { color: var(--blue2); font-style: italic; }
.doc span.zh { font-size: 1.12em; color: #0F172A; }
.doc .ex { background: #F8FAFC; border-left: 4px solid var(--blue2); border-radius: 0 10px 10px 0; padding: 8px 14px; margin: 8px 0; break-inside: avoid; }
.doc .ex .zh { font-size: 18px; color: #0F172A; }
.doc .ex .zh b { color: var(--red); }
.doc .ex .py { font-size: 14px; }
.doc .ex .vi { color: #475569; font-size: 14px; }
.doc .formula { display: inline-block; background: var(--navy); color: #93C5FD; font-weight: 700; padding: 6px 16px; border-radius: 10px; margin: 6px 0; font-family: "Noto Serif SC", Arial, serif; font-size: 16px; }
.doc .tip, .doc .warn, .doc .note { border-radius: 10px; padding: 10px 14px; margin: 10px 0; font-size: 14.5px; break-inside: avoid; }
.doc .tip { background: #ECFDF5; border: 1px solid #A7F3D0; }
.doc .warn { background: #F1F7FF; border: 1px solid #CDE1FE; }
.doc .note { background: #EFF6FF; border: 1px solid #BFDBFE; }
.doc .quiz { background: #EFF6FF; border: 1px dashed #3B82F6; border-radius: 12px; padding: 10px 16px; margin: 14px 0; break-inside: avoid; }
.doc .quiz h4 { margin-top: 4px; }
.doc .quiz details summary { cursor: pointer; font-weight: 700; color: var(--blue); }
.doc table.t { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 14px; break-inside: auto; }
.doc table.t th, .doc table.t td { border: 1px solid var(--line); padding: 6px 9px; text-align: left; vertical-align: top; }
.doc table.t th { background: #E8EFFF; color: var(--navy); }
.doc table.t tr { break-inside: avoid; }
.doc .grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 10px 0; }
.doc .grid .card { border: 1px solid var(--line); border-radius: 12px; padding: 10px; text-align: center; background: #fff; box-shadow: none; break-inside: avoid; }
.doc .grid .card .big { font-family: "Noto Serif SC", "KaiTi", serif; font-size: 34px; color: var(--red); line-height: 1.2; }
.doc .grid .card .small { font-size: 13px; color: var(--muted); font-family: "Noto Serif SC", serif; }
@media (max-width: 640px) { .doc .grid { grid-template-columns: repeat(2, 1fr); } }
/* chỉ khi in */
@media print {
  .doc h2 { break-before: page; margin-top: 0; }
  .doc h2:first-of-type { break-before: auto; }
  .doc .quiz details { display: block; } .doc .quiz details > * { display: block; }
}