/**
 * NTMK Printable Exam & OMR Bubble Sheet Styles
 * High-fidelity A4 two-column exam layout, MOET Decision 764 OMR answer sheet, and print media rules
 */

/* ═══════════════════════════════════════════════════════════
   SCREEN PREVIEW MODAL
   ═══════════════════════════════════════════════════════════ */
.printable-modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 99999;
  overflow-y: auto;
  padding: 20px;
}

.printable-modal-overlay.open {
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.printable-modal-content {
  background: #f1f5f9;
  border-radius: 14px;
  width: 100%;
  max-width: 960px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  overflow: hidden;
  margin: 20px auto;
}

.printable-top-toolbar {
  background: #1e293b;
  color: #ffffff;
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.toolbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.toolbar-title {
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.printable-tab-pills {
  display: flex;
  gap: 4px;
  background: rgba(255, 255, 255, 0.1);
  padding: 3px;
  border-radius: 8px;
}

.pill-btn {
  border: none;
  background: transparent;
  color: #cbd5e1;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 6px;
}

.pill-btn.active {
  background: #d97706;
  color: #ffffff;
}

/* Multi-variant Switcher */
.printable-variant-pills {
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(255, 255, 255, 0.08);
  padding: 3px 6px;
  border-radius: 8px;
  margin-left: 6px;
}

.variant-label {
  font-size: 0.78rem;
  color: #cbd5e1;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
  margin-right: 4px;
}

.variant-pill {
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: transparent;
  color: #cbd5e1;
  padding: 4px 8px;
  border-radius: 5px;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
}

.variant-pill:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

.variant-pill.active {
  background: #0284c7;
  border-color: #38bdf8;
  color: #ffffff;
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-print-action {
  background: linear-gradient(135deg, #059669, #047857);
  color: #ffffff;
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.88rem;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(4, 120, 87, 0.3);
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-close-print {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #cbd5e1;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Document Container */
.printable-document-view {
  padding: 30px;
  display: flex;
  justify-content: center;
  background: #e2e8f0;
}

.print-page {
  background: #ffffff;
  color: #000000;
  width: 210mm;
  min-height: 297mm;
  padding: 16mm 16mm;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  font-family: 'Times New Roman', Times, serif;
  font-size: 11pt;
  line-height: 1.35;
  box-sizing: border-box;
  position: relative;
}

/* Exam Paper Layout */
.exam-header-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 10px;
  text-align: center;
}

.school-authority { font-weight: bold; font-size: 10.5pt; text-transform: uppercase; }
.school-name { font-weight: bold; font-size: 11pt; text-transform: uppercase; }
.exam-desc { font-style: italic; font-size: 9.5pt; margin-top: 2px; }

.exam-subject-title { font-weight: bold; font-size: 11.5pt; text-transform: uppercase; }
.exam-time-limit { font-style: italic; font-size: 9.5pt; margin-top: 2px; }
.exam-code-box {
  display: inline-block;
  border: 1.5px solid #000;
  padding: 2px 12px;
  margin-top: 4px;
  font-size: 10pt;
}

.student-info-strip {
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
  font-size: 10.5pt;
  flex-wrap: wrap;
  gap: 6px;
}

.exam-rule-hint {
  text-align: center;
  font-style: italic;
  font-size: 9.5pt;
  margin: 6px 0;
}

.exam-divider {
  border: 0;
  border-top: 1px solid #000;
  margin: 8px 0 12px;
}

/* True 2-Column Questions Layout */
.exam-questions-two-column {
  columns: 2;
  column-gap: 20px;
  column-rule: 0.5px solid #999;
  text-align: justify;
}

.part-banner {
  break-inside: avoid;
  page-break-inside: avoid;
  margin: 8px 0 10px;
  font-size: 10.5pt;
  border-bottom: 1px dashed #666;
  padding-bottom: 4px;
}

.print-q-card {
  break-inside: avoid;
  page-break-inside: avoid;
  margin-bottom: 10px;
  font-size: 10.5pt;
}

.q-options-list {
  margin-top: 4px;
}

.opt-line {
  margin-bottom: 2px;
}

.print-passage-quote {
  font-style: italic;
  background: #f8fafc;
  border-left: 2px solid #333;
  padding: 4px 8px;
  margin: 4px 0 6px;
  font-size: 10pt;
}

.tf-statements-print {
  margin-top: 4px;
}

.tf-stmt-line {
  margin-bottom: 3px;
}

.exam-footer-end {
  text-align: center;
  margin-top: 20px;
  font-weight: bold;
}

/* ═══════════════════════════════════════════════════════════
   OMR BUBBLE SHEET STYLING (MOET Decision 764/QĐ-BGDĐT)
   ═══════════════════════════════════════════════════════════ */
.omr-page {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 10pt;
  position: relative;
  border: 1px solid transparent;
}

/* Optical Calibration Corner Marks & Timing Marks for OMR Scanner */
.omr-corner-mark {
  position: absolute;
  width: 7mm;
  height: 7mm;
  background: #000000;
}

.omr-corner-mark.top-left { top: 6mm; left: 6mm; }
.omr-corner-mark.top-right { top: 6mm; right: 6mm; }
.omr-corner-mark.bottom-left { bottom: 6mm; left: 6mm; }
.omr-corner-mark.bottom-right { bottom: 6mm; right: 6mm; }

.omr-timing-mark {
  position: absolute;
  width: 3.5mm;
  top: 22mm;
  bottom: 22mm;
  background-image: repeating-linear-gradient(to bottom, #000000 0, #000000 2.5mm, transparent 2.5mm, transparent 5mm);
}

.omr-timing-mark.timing-left { left: 5mm; }
.omr-timing-mark.timing-right { right: 5mm; }

.omr-header {
  text-align: center;
  border-bottom: 1.5px solid #000;
  padding-bottom: 6px;
  margin-bottom: 10px;
}

.omr-authority { font-size: 9.5pt; font-weight: bold; text-transform: uppercase; }
.omr-school { font-size: 9.5pt; font-weight: bold; }
.omr-main-heading { font-size: 14pt; font-weight: 900; letter-spacing: 0.05em; margin: 3px 0; }
.omr-sub-heading { font-size: 8.5pt; font-style: italic; }

.omr-top-tables {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 14px;
  margin-bottom: 10px;
}

.omr-info-box {
  line-height: 1.7;
  font-size: 9pt;
  border: 1px solid #333;
  padding: 6px 10px;
}

.omr-numbers-box {
  display: flex;
  gap: 8px;
}

.bubble-grid-column {
  border: 1px solid #000;
  padding: 4px;
  text-align: center;
  flex: 1;
}

.grid-title { font-size: 8pt; font-weight: bold; margin-bottom: 4px; }

.code-boxes-row {
  display: flex;
  justify-content: center;
  gap: 2px;
  margin-bottom: 4px;
}

.code-boxes-row span {
  width: 14px;
  height: 16px;
  border: 1px solid #000;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 8pt;
}

.digit-row {
  display: flex;
  justify-content: center;
  gap: 2px;
  margin-bottom: 2px;
}

.bubble {
  width: 13.5px;
  height: 13.5px;
  border: 1.2px solid #000;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 6.8pt;
  font-weight: bold;
  background: #ffffff;
  color: #000000;
  box-sizing: border-box;
}

.bubble.filled { background: #000000; color: #ffffff; }
.bubble.wrong-mark { color: #dc2626; font-weight: bold; }

.omr-guide-banner {
  border: 1px dashed #000;
  padding: 5px 8px;
  font-size: 8pt;
  margin-bottom: 8px;
}

.omr-section-title {
  font-size: 9pt;
  font-weight: bold;
  background: #f1f5f9;
  padding: 3px 8px;
  border: 1px solid #333;
  margin-bottom: 6px;
}

.omr-mcq-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 3px 12px;
}

.omr-q-row {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 8pt;
}

.omr-q-row .q-label {
  font-weight: bold;
  min-width: 18px;
}

.omr-tf-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.omr-tf-card {
  border: 1px solid #333;
  padding: 5px 6px;
  break-inside: avoid;
  page-break-inside: avoid;
}

.tf-card-title { font-weight: bold; font-size: 8.5pt; margin-bottom: 3px; border-bottom: 1px solid #ccc; }

.omr-tf-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 2px;
  font-size: 8pt;
}

.sub-letter { font-weight: bold; min-width: 14px; }

/* Part III Short Answer Grid */
.omr-sa-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
  margin-top: 4px;
}

.omr-sa-card {
  border: 1px solid #000;
  padding: 4px 3px;
  text-align: center;
  break-inside: avoid;
  page-break-inside: avoid;
}

.sa-card-title {
  font-weight: bold;
  font-size: 8pt;
  margin-bottom: 3px;
  border-bottom: 1px solid #999;
  padding-bottom: 1px;
}

.sa-boxes-row {
  display: flex;
  justify-content: center;
  gap: 2px;
  margin-bottom: 3px;
}

.sa-boxes-row span {
  width: 11px;
  height: 14px;
  border: 1px solid #000;
  display: inline-block;
}

.sa-matrix {
  display: flex;
  flex-direction: column;
  gap: 1.5px;
}

.sa-matrix-row {
  display: flex;
  justify-content: center;
  gap: 2px;
}

.sa-matrix-row .bubble {
  width: 12px;
  height: 12px;
  font-size: 6pt;
}

/* ═══════════════════════════════════════════════════════════
   ANSWER KEY & SCORING GUIDE STYLING
   ═══════════════════════════════════════════════════════════ */
.key-page {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 10pt;
}

.key-header {
  text-align: center;
  margin-bottom: 14px;
  border-bottom: 1.5px solid #000;
  padding-bottom: 8px;
}

.key-header h2 {
  font-size: 12pt;
  margin: 0 0 4px;
  text-transform: uppercase;
}

.key-header p {
  margin: 0;
  font-size: 9.5pt;
  font-style: italic;
}

.key-section-title {
  font-size: 9.5pt;
  font-weight: bold;
  background: #f1f5f9;
  padding: 4px 8px;
  border-left: 3px solid #0284c7;
  margin-bottom: 8px;
}

.key-matrix-table table,
.sa-key-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 9pt;
}

.key-matrix-table th,
.key-matrix-table td,
.sa-key-table th,
.sa-key-table td {
  border: 1px solid #333;
  padding: 4px 6px;
  text-align: center;
}

.key-matrix-table th,
.sa-key-table th {
  background: #e2e8f0;
  font-weight: bold;
}

.key-ans {
  font-weight: bold;
  color: #0369a1;
}

.moet-scoring-rule-box {
  background: #fffbeb;
  border: 1px solid #fde68a;
  padding: 4px 8px;
  font-size: 8.5pt;
  font-style: italic;
  margin-bottom: 8px;
}

.tf-key-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.tf-key-card {
  border: 1px solid #ccc;
  padding: 8px;
  border-radius: 4px;
}

.tf-key-card h4 {
  margin: 0 0 6px;
  font-size: 9.5pt;
  border-bottom: 1px solid #e2e8f0;
  padding-bottom: 4px;
}

.sub-key-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 8.5pt;
}

.sub-key-table td {
  padding: 3px 4px;
  border-bottom: 1px dashed #e2e8f0;
}

.badge-cell {
  font-weight: bold;
  text-align: center;
  width: 60px;
}

.badge-cell.dung { color: #047857; }
.badge-cell.sai { color: #b91c1c; }

.sa-key-table td {
  padding: 6px;
}

.sa-ans-value {
  color: #0369a1;
}

/* ═══════════════════════════════════════════════════════════
   PRINT MEDIA RULES (True A4 Two-Column & No Orphaned Questions)
   ═══════════════════════════════════════════════════════════ */
@media print {
  body {
    background: #ffffff !important;
    color: #000000 !important;
    margin: 0 !important;
    padding: 0 !important;
  }

  /* Hide screen-only interactive chrome */
  header,
  nav,
  .mobile-bottom-nav,
  #main-content,
  .printable-top-toolbar,
  .no-print {
    display: none !important;
  }

  .printable-modal-overlay {
    position: static !important;
    display: block !important;
    padding: 0 !important;
    background: none !important;
  }

  .printable-modal-content {
    box-shadow: none !important;
    border-radius: 0 !important;
    margin: 0 !important;
    max-width: none !important;
  }

  .printable-document-view {
    padding: 0 !important;
    background: none !important;
  }

  .print-page {
    width: 100% !important;
    min-height: auto !important;
    box-shadow: none !important;
    padding: 0 !important;
    margin: 0 !important;
    page-break-after: always;
    break-after: page;
  }

  /* Prevent orphaned questions across columns & pages */
  .print-q-card,
  .part-banner,
  .omr-tf-card,
  .omr-sa-card {
    page-break-inside: avoid !important;
    break-inside: avoid !important;
  }

  @page {
    size: A4 portrait;
    margin: 12mm 15mm;
  }
}