/* MMM Study — Mathematics Subject Architecture Styles */
@import "../design_system.css";

:root {
  --subject-accent: var(--subj-math, #7C3AED);
  --subj-math-accent: #7C3AED;
  --subj-math-light: #F5F3FF;
  --subj-math-border: #DDD6FE;
  --subj-math-dark: #5B21B6;
  --subj-math-hover: #6D28D9;
}

/* Container Layout */
main {
  max-width: 1240px;
  width: 100%;
  margin: 0 auto;
  box-sizing: border-box;
}

/* Progressive Curriculum Navigation Bar */
.curriculum-nav-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 22px;
  padding: 12px 18px;
  background: var(--surface-card, #FFFFFF);
  border: 1px solid var(--border-color, #E2E8F0);
  border-radius: var(--radius-md, 12px);
  box-shadow: var(--shadow-sm, 0 1px 3px rgba(11, 30, 54, 0.05));
  width: 100%;
  box-sizing: border-box;
}

.curriculum-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-pill, 9999px);
  background: var(--brand-navy-900, #0B1E36);
  color: #FFFFFF;
  font-size: 13.5px;
  font-weight: 600;
  border: 1px solid var(--brand-gold-border, rgba(197, 155, 39, 0.3));
  cursor: pointer;
  transition: all 0.18s ease;
  font-family: inherit;
  min-height: 38px;
}

.curriculum-back-btn:hover {
  background: var(--brand-gold, #C59B27);
  color: var(--brand-navy-950, #071324);
  transform: translateX(-2px);
  box-shadow: 0 4px 12px rgba(197, 155, 39, 0.3);
}

.curriculum-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: var(--text-secondary, #64748B);
  flex-wrap: wrap;
}

.curriculum-breadcrumbs a,
.breadcrumb-link,
.crumb-link {
  color: var(--brand-navy-800, #143058);
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.15s ease;
}

.curriculum-breadcrumbs a:hover,
.breadcrumb-link:hover,
.crumb-link:hover {
  color: var(--subj-math-accent, #7C3AED);
}

.curriculum-breadcrumbs .crumb-sep,
.curriculum-breadcrumbs .separator {
  color: #CBD5E1;
  user-select: none;
}

.curriculum-breadcrumbs strong,
.curriculum-breadcrumbs .current {
  color: var(--subj-math-dark, #5B21B6);
  font-weight: 700;
}

/* Screen 1: Primary Mode Cards (Notes vs Practice) */
.subject-mode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 18px;
  margin-bottom: 32px;
}

.mode-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 18px 22px;
  background: var(--surface-card, #FFFFFF);
  border: 2px solid var(--border-color, #E2E8F0);
  border-radius: var(--radius-lg, 16px);
  text-decoration: none;
  color: inherit;
  transition: all 0.22s ease;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm, 0 1px 3px rgba(11, 30, 54, 0.05));
}

.mode-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: var(--subj-math-accent, #7C3AED);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.mode-card:hover {
  border-color: var(--subj-math-accent, #7C3AED);
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(124, 58, 237, 0.12);
}

@media (max-width: 768px) {
  .subject-mode-grid .mode-card {
    padding: 16px 18px !important;
  }
}

.mode-card:hover::before {
  opacity: 1;
}

.mode-icon-box,
.mode-icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--subj-math-light, #F5F3FF);
  color: var(--subj-math-dark, #5B21B6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 16px;
  border: 1px solid var(--subj-math-border, #DDD6FE);
}

.mode-title,
.mode-card h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--brand-navy-900, #0B1E36);
  margin: 0 0 4px 0;
}

.mode-title-burmese {
  font-size: 14px;
  font-weight: 500;
  color: var(--brand-gold, #C59B27);
  margin: 0 0 10px 0;
}

.mode-desc,
.mode-card p {
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-secondary, #64748B);
  margin: 0 0 18px 0;
}

.mode-badge-wrap {
  margin-bottom: 12px;
}

.mode-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 700;
  color: var(--subj-math-dark, #5B21B6);
  background: var(--subj-math-light, #F5F3FF);
  padding: 4px 12px;
  border-radius: var(--radius-pill, 9999px);
  border: 1px solid var(--subj-math-border, #DDD6FE);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.mode-action-btn,
.mode-card-action {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: var(--radius-md, 8px);
  background: var(--subj-math-accent, #7C3AED);
  color: #FFFFFF;
  font-size: 13.5px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease;
  font-family: inherit;
}

.mode-card:hover .mode-action-btn,
.mode-card:hover .mode-card-action {
  background: var(--subj-math-dark, #5B21B6);
}

/* Chapter Selection Grid (Notes & Practice) */
.math-chapter-grid,
.chapter-selector-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.math-chapter-card {
  display: flex;
  flex-direction: column;
  padding: 20px;
  background: var(--surface-card, #FFFFFF);
  border: 1px solid var(--border-color, #E2E8F0);
  border-radius: var(--radius-md, 12px);
  text-decoration: none;
  color: inherit;
  transition: all 0.18s ease;
  cursor: pointer;
  min-height: 150px;
  box-sizing: border-box;
}

.math-chapter-card:hover {
  border-color: var(--subj-math-accent, #7C3AED);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(124, 58, 237, 0.1);
}

.math-chapter-card .card-top,
.math-chapter-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.math-chapter-card .chapter-badge,
.math-chapter-num {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--subj-math-dark, #5B21B6);
  background: var(--subj-math-light, #F5F3FF);
  padding: 3px 10px;
  border-radius: var(--radius-pill, 9999px);
}

.math-chapter-card .chapter-type-pill {
  font-size: 11.5px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-pill, 9999px);
  background: #F1F5F9;
  color: #475569;
}

.math-chapter-card .chapter-name,
.math-chapter-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--brand-navy-900, #0B1E36);
  margin: 0 0 8px 0;
  line-height: 1.4;
}

.math-chapter-card .chapter-preview {
  font-size: 13px;
  color: var(--text-secondary, #64748B);
  margin: 0 0 14px 0;
  line-height: 1.45;
}

.math-chapter-card .chapter-btn,
.math-chapter-action {
  margin-top: auto;
  font-size: 13px;
  font-weight: 600;
  color: var(--subj-math-accent, #7C3AED);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: inherit;
}

/* Mathematics Mark Value Cards (1, 2, 3, 5 Marks) */
.math-marks-grid,
.mark-category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.math-mark-card,
.mark-card {
  display: flex;
  flex-direction: column;
  padding: 14px 16px;
  background: var(--surface-card, #FFFFFF);
  border: 1px solid var(--border-color, #E2E8F0);
  border-radius: var(--radius-md, 14px);
  text-decoration: none;
  color: inherit;
  transition: all 0.2s ease;
  cursor: pointer;
  position: relative;
  box-sizing: border-box;
}

.math-mark-card:hover,
.mark-card:hover {
  border-color: var(--subj-math-accent, #7C3AED);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(124, 58, 237, 0.12);
}

.mark-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
  width: 100%;
}

.mark-card-header .qtype-label-group {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.mark-icon {
  font-size: 18px;
  line-height: 1;
}

.mark-title,
.mark-card h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--brand-navy-900, #0B1E36);
  margin: 0;
}

.mark-value-badge,
.mark-badge-pill {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--radius-pill, 9999px);
  font-size: 11px;
  font-weight: 700;
  width: fit-content;
  white-space: nowrap;
}

.mark-1 { background: #ECFDF5; color: #065F46; border: 1px solid #A7F3D0; }
.mark-2 { background: #EFF6FF; color: #1E40AF; border: 1px solid #BFDBFE; }
.mark-3 { background: #FFFBEB; color: #92400E; border: 1px solid #FDE68A; }
.mark-5 { background: #F5F3FF; color: #5B21B6; border: 1px solid #DDD6FE; }

.mark-scoring-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-pill, 9999px);
  background: #F1F5F9;
  color: #475569;
}

.mark-title,
.mark-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--brand-navy-900, #0B1E36);
  margin: 0 0 4px 0;
}

.mark-subtitle {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--subj-math-accent, #7C3AED);
  margin-bottom: 10px;
}

.mark-desc,
.mark-card p {
  font-size: 13px;
  color: var(--text-secondary, #64748B);
  line-height: 1.45;
  margin: 0 0 16px 0;
  flex-grow: 1;
}

.btn-start-marks,
.mark-card .btn-start {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 16px;
  background: var(--subj-math-accent, #7C3AED);
  color: #FFFFFF;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-md, 8px);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease;
  font-family: inherit;
}

.btn-start-marks:hover,
.mark-card:hover .btn-start {
  background: var(--subj-math-dark, #5B21B6);
}

/* Notes Reader & Resources */
.notes-reader-container,
.notes-container {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 16px;
}

.resource-detail-card,
.note-resource-card {
  padding: 22px;
  background: var(--surface-card, #FFFFFF);
  border: 1px solid var(--border-color, #E2E8F0);
  border-radius: var(--radius-lg, 14px);
  box-shadow: var(--shadow-sm, 0 1px 3px rgba(11, 30, 54, 0.05));
}

.resource-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.resource-tag {
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--subj-math-dark, #5B21B6);
  background: var(--subj-math-light, #F5F3FF);
  padding: 3px 10px;
  border-radius: var(--radius-pill, 9999px);
  border: 1px solid var(--subj-math-border, #DDD6FE);
}

.resource-heading,
.note-resource-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--brand-navy-900, #0B1E36);
  margin: 0;
}

.resource-text,
.note-resource-card .note-desc {
  font-size: 14px;
  color: var(--text-secondary, #64748B);
  line-height: 1.5;
  margin: 0 0 14px 0;
}

.resource-body,
.note-body-content {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--brand-navy-900, #0B1E36);
  background: #FAF8F5;
  padding: 18px;
  border-radius: 8px;
  border: 1px solid #EFEAE2;
  overflow-x: auto;
  margin-bottom: 14px;
  white-space: pre-wrap;
}

.resource-image-wrap,
.note-image-wrap {
  width: 100%;
  max-width: 600px;
  margin: 12px auto;
  text-align: center;
}

.resource-responsive-image,
.note-image-wrap img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: var(--shadow-sm, 0 1px 4px rgba(0,0,0,0.1));
}

.resource-attachment {
  margin-top: 12px;
}

.resource-download-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: var(--radius-md, 8px);
  background: var(--subj-math-light, #F5F3FF);
  color: var(--subj-math-dark, #5B21B6);
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--subj-math-border, #DDD6FE);
  text-decoration: none;
  transition: all 0.15s ease;
}

.resource-download-link:hover {
  background: var(--subj-math-accent, #7C3AED);
  color: #FFFFFF;
}

.notes-footer-action {
  margin-top: 24px;
  text-align: center;
}

/* Polished Empty & Error States */
.empty-notes-card,
.empty-curriculum-state {
  text-align: center;
  padding: 48px 24px;
  background: var(--surface-card, #FFFFFF);
  border: 1px solid var(--border-color, #E2E8F0);
  border-radius: var(--radius-lg, 16px);
  margin-top: 20px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.empty-notes-icon,
.empty-state-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.empty-notes-title,
.empty-curriculum-state h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--brand-navy-900, #0B1E36);
  margin: 0 0 8px 0;
}

.empty-notes-desc,
.empty-curriculum-state p {
  font-size: 14px;
  color: var(--text-secondary, #64748B);
  line-height: 1.55;
  margin: 0 0 24px 0;
}

.empty-notes-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.btn-math-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-md, 8px);
  background: var(--subj-math-accent, #7C3AED);
  color: #FFFFFF;
  font-size: 13.5px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease;
  font-family: inherit;
}

.btn-math-primary:hover {
  background: var(--subj-math-dark, #5B21B6);
}

.btn-math-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: var(--radius-md, 8px);
  background: #F1F5F9;
  color: #475569;
  font-size: 13.5px;
  font-weight: 600;
  border: 1px solid #CBD5E1;
  cursor: pointer;
  transition: background 0.15s ease;
  font-family: inherit;
}

.btn-math-secondary:hover {
  background: #E2E8F0;
  color: #0F172A;
}

/* Loading state */
.notes-loading-state {
  text-align: center;
  padding: 40px;
  color: var(--text-secondary, #64748B);
  font-size: 14px;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  .subject-mode-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .math-marks-grid,
  .mark-category-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .math-chapter-grid,
  .chapter-selector-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}


/* ========================================================================= */
/* Phase 3.4 Mathematics Unified Academic UI Benchmark Rules                 */
/* ========================================================================= */

:root {
  --subj-math-accent: #7C3AED;
  --subj-math-light: #F5F3FF;
  --subj-math-border: #DDD6FE;
  --subj-math-dark: #5B21B6;
  --subj-math-hover: #6D28D9;
  --subj-math-text-primary: #0F172A;
  --subj-math-text-secondary: #475569;
  --subj-math-surface: #FFFFFF;
  --subj-math-surface-subtle: #F8FAFC;
  --subj-math-card-border: #E2E8F0;
  --subj-math-radius-sm: 6px;
  --subj-math-radius-md: 8px;
  --subj-math-radius-lg: 12px;
  --subj-math-shadow-sm: 0 1px 3px rgba(11, 30, 54, 0.05);
  --subj-math-shadow-md: 0 4px 12px rgba(11, 30, 54, 0.08);
}

/* Mode Selection Cards (Screen 1) */
.subject-mode-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 18px;
}

@media (max-width: 768px) {
  .subject-mode-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
}

.subject-mode-grid .mode-card {
  position: relative;
  background: var(--subj-math-surface, #FFFFFF);
  border: 1px solid var(--subj-math-card-border, #E2E8F0);
  border-radius: var(--subj-math-radius-lg, 12px);
  padding: 18px 22px !important;
  display: flex;
  flex-direction: column;
  transition: transform 0.18s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.18s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.18s ease;
  box-shadow: var(--subj-math-shadow-sm, 0 1px 3px rgba(11, 30, 54, 0.05));
  cursor: pointer;
  outline: none;
  text-align: left;
}

.mode-card:hover {
  transform: translateY(-2px);
  border-color: #C4B5FD;
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.08);
}

.mode-badge-wrap {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 8px;
}

.mode-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 3px 9px;
  border-radius: 999px;
  background: #F5F3FF;
  color: #7C3AED;
  border: 1px solid #DDD6FE;
}

.mode-icon-box {
  width: 46px;
  height: 46px;
  border-radius: var(--subj-math-radius-md, 8px);
  background: #F5F3FF;
  color: #7C3AED;
  border: 1px solid #DDD6FE;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  transition: transform 0.18s ease, background 0.18s ease;
}

.mode-card:hover .mode-icon-box {
  transform: scale(1.04);
  background: #EDE9FE;
}

.mode-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--subj-math-text-primary, #0F172A);
  margin: 0 0 4px 0;
  letter-spacing: -0.01em;
}

.mode-title-burmese {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--subj-math-text-secondary, #475569);
  margin: 0 0 8px 0;
  line-height: 1.45 !important;
}

.mode-desc {
  font-size: 13.5px;
  color: var(--subj-math-text-secondary, #475569);
  line-height: 1.5;
  margin: 0 0 16px 0;
  flex-grow: 1;
}

.mode-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 9px 14px;
  border-radius: var(--subj-math-radius-md, 8px);
  font-size: 13px;
  font-weight: 600;
  border: 1px solid #DDD6FE;
  background: #F5F3FF;
  color: #7C3AED;
  transition: all 0.15s ease;
  cursor: pointer;
  box-sizing: border-box;
}

.mode-card:hover .mode-action-btn {
  background: #7C3AED;
  color: #FFFFFF;
  border-color: #7C3AED;
}

/* Chapter Selector Cards (Screens 2 & 4) */
.math-chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 14px;
  margin-top: 18px;
}

@media (max-width: 640px) {
  .math-chapter-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }
}

.math-chapter-card {
  background: var(--subj-math-surface, #FFFFFF);
  border: 1px solid var(--subj-math-card-border, #E2E8F0);
  border-radius: var(--subj-math-radius-lg, 12px);
  padding: 18px;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
  cursor: pointer;
  outline: none;
  box-shadow: var(--subj-math-shadow-sm, 0 1px 3px rgba(11, 30, 54, 0.05));
}

.math-chapter-card:hover {
  transform: translateY(-2px);
  border-color: #C4B5FD;
  box-shadow: 0 6px 18px rgba(124, 58, 237, 0.07);
}

.math-chapter-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.math-chapter-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 11px;
  font-weight: 700;
  color: #7C3AED;
  background: #F5F3FF;
  border: 1px solid #DDD6FE;
  padding: 3px 8px;
  border-radius: var(--subj-math-radius-sm, 6px);
}

.math-chapter-pill {
  font-size: 11.5px;
  font-weight: 600;
  color: #475569;
  background: #F1F5F9;
  padding: 3px 8px;
  border-radius: 999px;
}

.math-chapter-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--subj-math-text-primary, #0F172A);
  margin: 0 0 6px 0;
  line-height: 1.4;
}

.math-chapter-preview {
  font-size: 13px;
  color: var(--subj-math-text-secondary, #475569);
  line-height: 1.5;
  margin: 0 0 14px 0;
  flex-grow: 1;
}

.math-chapter-action {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 8px 12px;
  border-radius: var(--subj-math-radius-sm, 6px);
  font-size: 12.5px;
  font-weight: 600;
  border: 1px solid #E2E8F0;
  background: #FFFFFF;
  color: #7C3AED;
  transition: all 0.15s ease;
  cursor: pointer;
  box-sizing: border-box;
}

.math-chapter-card:hover .math-chapter-action {
  background: #7C3AED;
  color: #FFFFFF;
  border-color: #7C3AED;
}

/* Screen 5: Mark Value Category Cards */
.math-marks-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 18px;
}

@media (max-width: 768px) {
  .math-marks-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}

.math-mark-card {
  background: var(--subj-math-surface, #FFFFFF);
  border: 1px solid var(--subj-math-card-border, #E2E8F0);
  border-radius: var(--subj-math-radius-lg, 12px);
  padding: 20px;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
  box-shadow: var(--subj-math-shadow-sm, 0 1px 3px rgba(11, 30, 54, 0.05));
  cursor: pointer;
}

.math-mark-card:hover {
  transform: translateY(-2px);
  border-color: #C4B5FD;
  box-shadow: 0 6px 18px rgba(124, 58, 237, 0.08);
}

.mark-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.mark-icon-box {
  width: 38px;
  height: 38px;
  border-radius: var(--subj-math-radius-md, 8px);
  background: #F5F3FF;
  color: #7C3AED;
  border: 1px solid #DDD6FE;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mark-card-heading-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mark-card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--subj-math-text-primary, #0F172A);
  margin: 0;
}

.mark-scope-pill {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 999px;
  background: #F5F3FF;
  color: #7C3AED;
  border: 1px solid #DDD6FE;
}

.mark-subtitle-text {
  font-size: 12.5px;
  font-weight: 600;
  color: #6D28D9;
  margin: 0 0 6px 0;
}

.mark-desc-text {
  font-size: 13px;
  color: var(--subj-math-text-secondary, #475569);
  line-height: 1.5;
  margin: 0 0 16px 0;
  flex-grow: 1;
}

.btn-start-marks {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 9px 14px;
  border-radius: var(--subj-math-radius-md, 8px);
  font-size: 13px;
  font-weight: 600;
  border: 1px solid #DDD6FE;
  background: #F5F3FF;
  color: #7C3AED;
  text-decoration: none;
  transition: all 0.15s ease;
  box-sizing: border-box;
}

.math-mark-card:hover .btn-start-marks {
  background: #7C3AED;
  color: #FFFFFF;
  border-color: #7C3AED;
}

/* Empty Notes State */
.empty-notes-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 240px;
  background: var(--subj-math-surface, #FFFFFF);
  border: 1px dashed #CBD5E1;
  border-radius: var(--subj-math-radius-lg, 12px);
  margin-top: 18px;
  padding: 36px 24px;
  text-align: center;
}

.empty-notes-icon-box {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #F5F3FF;
  color: #7C3AED;
  border: 1px solid #DDD6FE;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

.empty-notes-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--subj-math-text-primary, #0F172A);
  margin: 0 0 6px 0;
}

.empty-notes-desc {
  font-size: 13.5px;
  color: var(--subj-math-text-secondary, #475569);
  line-height: 1.55;
  max-width: 480px;
  margin: 0 0 20px 0;
}

.empty-notes-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.btn-math-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #7C3AED;
  color: #FFFFFF;
  border: none;
  padding: 9px 18px;
  border-radius: var(--subj-math-radius-md, 8px);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-math-primary:hover {
  background: #6D28D9;
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.25);
}

.btn-math-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #FFFFFF;
  color: #475569;
  border: 1px solid #CBD5E1;
  padding: 9px 18px;
  border-radius: var(--subj-math-radius-md, 8px);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-math-secondary:hover {
  background: #F8FAFC;
  border-color: #94A3B8;
}

/* KaTeX Mathematics Container Overflow Protection */
.katex-display,
.math-content,
.math-expression {
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
  padding: 4px 0;
  -webkit-overflow-scrolling: touch;
}

/* Focus Visible Rings (WCAG 2.1 AA) */
.mode-card:focus-visible,
.math-chapter-card:focus-visible,
.math-mark-card:focus-visible,
.btn-start-marks:focus-visible,
.btn-math-primary:focus-visible,
.btn-math-secondary:focus-visible,
.curriculum-back-btn:focus-visible {
  outline: 2px solid #7C3AED !important;
  outline-offset: 2px !important;
}

/* Reduced Motion Compatibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Burmese Font Rendering & Diacritic Collision Safeguard */
[lang="my"],
.mode-title-burmese {
  font-family: "Noto Sans Myanmar", "Padauk", "Pyidaungsu", -apple-system, sans-serif !important;
  line-height: 1.65 !important;
}

/* 44px Minimum Mobile Touch Target Size */
@media (max-width: 768px) {
  .mode-action-btn,
  .btn-start-marks,
  .btn-math-primary,
  .btn-math-secondary,
  .math-chapter-action,
  .curriculum-back-btn {
    min-height: 44px;
    box-sizing: border-box;
  }
}