/*
 * print.css — chi ap dung khi IN (media="print").
 * Muc tieu: an giao dien (navbar/sidebar/nut), chi in noi dung sach se,
 * cong thuc MathJax van hien (vi in tu trinh duyet nen JS da chay xong).
 */

/* An cac phan khong thuoc noi dung tai lieu.
   KHONG an [data-bs-toggle] vi nut accordion chinh la TIEU DE chuong. */
nav.navbar,
aside,
.navbar.fixed-bottom,
.btn,
form,
.accordion-button::after,
.no-print {
    display: none !important;
}

/* Bo mau nen/bong de tiet kiem muc, chu den ro rang */
* {
    box-shadow: none !important;
    text-shadow: none !important;
    color: #000 !important;
    background: #fff !important;
}

body { font-size: 12pt; }

.card, .ht-card, [class*="shadow"] {
    border: none !important;
    padding: 0 !important;
    margin: 0 0 .5rem 0 !important;
}

/* Accordion: in het (bo qua trang thai gap/mo) */
.accordion-collapse { display: block !important; height: auto !important; visibility: visible !important; }
.accordion-button { padding-left: 0 !important; font-weight: 700; }
.accordion-item { border: none !important; border-bottom: 1px solid #ccc !important; }

/* Ngat trang: moi chuong bat dau trang moi, khong cat doi 1 bai */
.accordion-item { break-before: page; page-break-before: always; }
.accordion-item:first-of-type { break-before: auto; page-break-before: auto; }
.ex-row, .lesson-theory, .border { break-inside: avoid; page-break-inside: avoid; }

/* Badge/nhan do kho: vien mong cho de doc khi in trang den trang */
.badge { border: 1px solid #999 !important; padding: 1px 6px !important; }

/* MathJax: dam bao cong thuc khong bi cat */
mjx-container { break-inside: avoid; }

/* Tieu de trang in */
.print-title { display: block !important; font-size: 16pt; font-weight: 800; margin-bottom: .25rem; }
.print-meta  { display: block !important; font-size: 10pt; margin-bottom: 1rem; }

@page { margin: 1.6cm 1.4cm; }