:root {
  --bg-body: #f4f7fb;
  --bg-surface: #ffffff;
  --bg-surface-alt: #f8fafc;
  --bg-elevated: #eff6ff;
  --text-main: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --border-strong: #cbd5e1;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #dbeafe;
  --primary-soft: #eff6ff;

  --accent: #0d9488;
  --accent-light: #ccfbf1;

  --warning: #d97706;
  --warning-bg: #fffbeb;
  --warning-border: #fde68a;

  --danger: #dc2626;
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;

  --success: #16a34a;
  --success-bg: #f0fdf4;
  --success-border: #bbf7d0;

  --rule-color: #7c3aed;
  --rule-bg: #f5f3ff;
  --rule-border: #ddd6fe;

  --code-bg: #0f172a;
  --code-text: #f8fafc;

  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 10px 25px rgba(15, 23, 42, 0.12);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --navbar-height: 68px;
  --sidebar-width: 340px;
}

[data-theme="dark"] {
  --bg-body: #0b1120;
  --bg-surface: #111827;
  --bg-surface-alt: #1e293b;
  --bg-elevated: #1e293b;
  --text-main: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: #1e293b;
  --border-strong: #334155;

  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --primary-light: #1e3a8a;
  --primary-soft: rgba(59, 130, 246, 0.12);

  --accent: #14b8a6;
  --accent-light: rgba(20, 184, 166, 0.15);

  --warning-bg: rgba(217, 119, 6, 0.12);
  --warning-border: rgba(217, 119, 6, 0.35);

  --danger-bg: rgba(220, 38, 38, 0.12);
  --danger-border: rgba(220, 38, 38, 0.35);

  --success-bg: rgba(22, 163, 74, 0.12);
  --success-border: rgba(22, 163, 74, 0.35);

  --rule-color: #a78bfa;
  --rule-bg: rgba(124, 58, 237, 0.14);
  --rule-border: rgba(124, 58, 237, 0.38);

  --code-bg: #020617;
  --code-text: #e2e8f0;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Cairo', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.75;
  overflow-x: hidden;
}

code, pre, .mono {
  font-family: 'JetBrains Mono', Consolas, monospace;
  direction: ltr !important;
  unicode-bidi: isolate !important;
}

:not(pre) > code {
  display: inline-block;
  direction: ltr !important;
  unicode-bidi: isolate !important;
  text-align: left;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  padding: 0px 6px;
  font-size: 0.88em;
  font-weight: 600;
  line-height: 1.5;
  vertical-align: baseline;
}

.ltr-expr, .ltr-group {
  direction: ltr !important;
  unicode-bidi: isolate !important;
  font-family: 'JetBrains Mono', 'Cairo', monospace;
  font-weight: 600;
}

pre .ltr-expr, pre .ltr-group {
  font-weight: inherit;
}

.tag-chip {
  direction: ltr !important;
  unicode-bidi: isolate !important;
  display: inline-block;
}

.quiz-opt-btn[dir="ltr"] {
  direction: ltr !important;
  unicode-bidi: isolate !important;
  text-align: left !important;
  font-family: 'JetBrains Mono', 'Cairo', monospace;
}

td[dir="ltr"], th[dir="ltr"] {
  direction: ltr !important;
  unicode-bidi: isolate !important;
  text-align: left;
}

.hidden {
  display: none !important;
}

/* ==================== الشريط العلوي ==================== */
.top-navbar {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  height: var(--navbar-height);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
  gap: 16px;
}

.navbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}

.brand-badge {
  background: linear-gradient(135deg, var(--primary), #4f46e5);
  color: #fff;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 800;
  font-size: 1rem;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.5px;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
}

.brand-text h1 {
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-main);
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: block;
}

.main-nav-tabs {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-surface-alt);
  padding: 5px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.nav-tab {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 700;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.nav-tab:hover {
  color: var(--primary);
  background: var(--primary-soft);
}

.nav-tab.active {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(37, 99, 235, 0.25);
}

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

/* البحث الشامل */
.global-search-wrap {
  position: relative;
  width: 270px;
}

.global-search-wrap input {
  width: 100%;
  padding: 8px 34px 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-surface-alt);
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.84rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.global-search-wrap input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

.search-icon {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.9rem;
  pointer-events: none;
}

.search-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  width: 420px;
  max-height: 460px;
  overflow-y: auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 1200;
  padding: 8px;
}

.search-result-item {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border-bottom: 1px solid var(--border-color);
  transition: background 0.15s;
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover {
  background: var(--primary-soft);
}

.search-result-title {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.search-result-snippet {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 3px;
}

/* شريط التقدم العلوي */
.progress-pill {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  min-width: 115px;
}

.progress-pill-text {
  display: flex;
  justify-content: space-between;
  font-size: 0.76rem;
  margin-bottom: 3px;
}

.progress-bar-mini {
  height: 5px;
  background: var(--border-strong);
  border-radius: 99px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width 0.3s ease;
}

.icon-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-surface-alt);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}

.icon-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-soft);
}

/* ==================== الهيكل العام والفهرس الجانبي ==================== */
.app-layout {
  display: flex;
  margin-top: var(--navbar-height);
  min-height: calc(100vh - var(--navbar-height));
}

.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-surface);
  border-left: 1px solid var(--border-color);
  position: fixed;
  top: var(--navbar-height);
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  z-index: 900;
  transition: transform 0.28s ease;
}

.sidebar.collapsed {
  transform: translateX(100%);
}

.sidebar-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-surface-alt);
}

.sidebar-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.sidebar-title-row h2 {
  font-size: 0.96rem;
  font-weight: 800;
}

.badge-pill {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 700;
  font-size: 0.76rem;
  padding: 2px 10px;
  border-radius: 99px;
  border: 1px solid var(--primary-light);
}

.sidebar-filter-row input {
  width: 100%;
  padding: 7px 11px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.82rem;
  margin-bottom: 8px;
}

.sidebar-quick-filters {
  display: flex;
  gap: 6px;
}

.chip-btn {
  flex: 1;
  padding: 4px 8px;
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
}

.chip-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 10px;
}

/* مجموعات الوحدات في الشريط الجانبي */
.sb-unit-group {
  margin-bottom: 10px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-surface);
}

.sb-unit-header {
  width: 100%;
  padding: 9px 12px;
  background: var(--bg-surface-alt);
  border: none;
  text-align: right;
  font-family: inherit;
  font-weight: 800;
  font-size: 0.82rem;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.sb-unit-header:hover {
  background: var(--primary-soft);
}

.sb-unit-lessons {
  border-top: 1px solid var(--border-color);
}

.sb-lesson-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 9px 12px;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background 0.15s;
}

.sb-lesson-item:last-child {
  border-bottom: none;
}

.sb-lesson-item:hover {
  background: var(--bg-surface-alt);
}

.sb-lesson-item.active {
  background: var(--primary-soft);
  border-right: 4px solid var(--primary);
}

.sb-lesson-num {
  min-width: 26px;
  height: 26px;
  border-radius: 6px;
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-strong);
  color: var(--text-secondary);
  font-size: 0.76rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.sb-lesson-item.completed .sb-lesson-num {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
}

.sb-lesson-info {
  flex: 1;
}

.sb-lesson-title {
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-main);
}

.sb-lesson-meta {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 2px;
  display: flex;
  gap: 8px;
}

/* ==================== منطقة المحتوى الرئيسية ==================== */
.main-content {
  flex: 1;
  margin-right: var(--sidebar-width);
  padding: 28px 32px 60px;
  max-width: 100%;
  transition: margin-right 0.28s ease;
}

.main-content.expanded {
  margin-right: 0;
}

.view-section {
  max-width: 1220px;
  margin: 0 auto;
}

/* ==================== البانر الرئيسي والإحصائيات ==================== */
.hero-banner {
  background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 55%, #0f766e 100%);
  color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-md);
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: 28px;
  align-items: center;
}

.hero-tag {
  display: inline-block;
  background: rgba(255, 255, 255, 0.16);
  padding: 4px 14px;
  border-radius: 99px;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 12px;
  backdrop-filter: blur(4px);
}

.hero-content h2 {
  font-size: 1.75rem;
  font-weight: 900;
  margin-bottom: 12px;
  line-height: 1.35;
}

.hero-content p {
  font-size: 0.96rem;
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 22px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.stat-card {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius-md);
  padding: 18px 16px;
  text-align: center;
  backdrop-filter: blur(6px);
}

.stat-num {
  display: block;
  font-size: 1.85rem;
  font-weight: 900;
  font-family: 'JetBrains Mono', monospace;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.9);
  font-weight: 600;
}

/* الأزرار */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.btn-lg {
  padding: 11px 22px;
  font-size: 0.95rem;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.hero-actions .btn-primary {
  background: #ffffff;
  color: #1e3a8a;
}

.hero-actions .btn-primary:hover {
  background: #eff6ff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.35);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.3);
}

.btn-outline {
  background: var(--bg-surface);
  color: var(--text-main);
  border-color: var(--border-strong);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-soft);
}

.hero-actions .btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.45);
}

.btn-success {
  background: var(--success);
  color: #fff;
}

/* ==================== الفهرس العام المنهجي (Master Index) ==================== */
.index-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  background: var(--bg-surface);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.index-toolbar h3 {
  font-size: 1.1rem;
  font-weight: 800;
}

.index-toolbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.index-toolbar-left select {
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-surface-alt);
  color: var(--text-main);
  font-family: inherit;
  font-weight: 600;
}

.unit-index-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 22px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.unit-index-header {
  padding: 18px 24px;
  background: linear-gradient(90deg, var(--primary-soft), var(--bg-surface-alt));
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.unit-index-title-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.unit-badge {
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  font-size: 0.85rem;
  padding: 5px 14px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.unit-index-header h4 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
}

.unit-meta-pills {
  display: flex;
  align-items: center;
  gap: 10px;
}

.unit-lessons-grid {
  padding: 18px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 16px;
}

.lesson-index-card {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px;
  background: var(--bg-surface-alt);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
  position: relative;
}

.lesson-index-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
  background: var(--bg-surface);
}

.lesson-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.lesson-num-badge {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 800;
  font-size: 0.82rem;
  padding: 3px 11px;
  border-radius: 6px;
}

.lesson-page-badge {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 800;
  font-size: 0.78rem;
  padding: 3px 10px;
  border-radius: 6px;
}

.lesson-index-card h5 {
  font-size: 1.02rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text-main);
  line-height: 1.45;
}

.lesson-index-summary {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.lesson-tags-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.tag-chip {
  font-size: 0.72rem;
  font-family: 'JetBrains Mono', 'Cairo', monospace;
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  color: var(--text-secondary);
  padding: 2px 8px;
  border-radius: 5px;
}

.lesson-card-footer {
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.lesson-counts {
  font-size: 0.76rem;
  color: var(--text-muted);
  display: flex;
  gap: 10px;
  font-weight: 600;
}

.lesson-card-btns {
  display: flex;
  gap: 6px;
}

/* ==================== واجهة عرض الدرس التفصيلي (Lesson View) ==================== */
.lesson-hero-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 22px;
  box-shadow: var(--shadow-sm);
}

.lesson-breadcrumb {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

.breadcrumb-trail {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 700;
}

.breadcrumb-trail a {
  color: var(--primary);
  text-decoration: none;
  cursor: pointer;
}

.lesson-hero-title {
  font-size: 1.65rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.35;
}

.lesson-hero-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 18px;
}

.lesson-summary-box {
  background: var(--primary-soft);
  border-right: 4px solid var(--primary);
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  margin-bottom: 18px;
  font-size: 0.94rem;
}

.key-takeaways-box {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 18px;
}

.key-takeaways-box h4 {
  font-size: 0.95rem;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--primary);
}

.key-takeaways-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 8px 18px;
  list-style: none;
}

.key-takeaways-grid li {
  position: relative;
  padding-right: 20px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.key-takeaways-grid li::before {
  content: "✔";
  position: absolute;
  right: 0;
  color: var(--accent);
  font-weight: bold;
}

/* شريط التبويبات داخل الدرس */
.lesson-subtabs {
  position: sticky;
  top: var(--navbar-height);
  z-index: 800;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 8px 12px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  box-shadow: var(--shadow-sm);
}

.subtabs-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.subtab-btn {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
}

.subtab-btn:hover {
  background: var(--bg-surface-alt);
  color: var(--primary);
}

.subtab-btn.active {
  background: var(--primary);
  color: #fff;
}

/* أقسام الشرح التفصيلي */
.lesson-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 30px 0 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--primary);
}

.lesson-block-header h3 {
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.explain-section-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.explain-section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.section-index-badge {
  background: var(--primary);
  color: #fff;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.explain-section-header h4 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
}

.rich-content p {
  margin-bottom: 12px;
  color: var(--text-main);
  font-size: 0.97rem;
}

.rich-content ul, .rich-content ol {
  padding-right: 24px;
  margin-bottom: 14px;
}

.rich-content li {
  margin-bottom: 6px;
}

.rich-content h5, .rich-content h4 {
  margin: 16px 0 8px;
  color: var(--primary);
  font-weight: 800;
}

/* الجداول التعليمية */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 16px 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
}

.study-table, .rich-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  background: var(--bg-surface);
}

.study-table th, .rich-content table th {
  background: var(--bg-surface-alt);
  color: var(--text-main);
  font-weight: 800;
  padding: 11px 14px;
  border-bottom: 2px solid var(--border-strong);
  border-left: 1px solid var(--border-color);
  text-align: right;
}

.study-table td, .rich-content table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  border-left: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.study-table tr:nth-child(even) td, .rich-content table tr:nth-child(even) td {
  background: var(--bg-surface-alt);
}

/* صناديق الملاحظات والقوانين والتنبيهات */
.callout {
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  margin: 14px 0;
  border-right: 4px solid var(--primary);
  background: var(--primary-soft);
  font-size: 0.93rem;
}

.callout-note {
  border-right-color: var(--primary);
  background: var(--primary-soft);
}

.callout-rule {
  border-right-color: var(--rule-color);
  background: var(--rule-bg);
  border: 1px solid var(--rule-border);
  border-right-width: 4px;
}

.callout-warning {
  border-right-color: var(--warning);
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-right-width: 4px;
}

.callout-danger {
  border-right-color: var(--danger);
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
  border-right-width: 4px;
}

.callout-success {
  border-right-color: var(--success);
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  border-right-width: 4px;
}

.formula-box {
  background: var(--bg-surface-alt);
  border: 2px dashed var(--primary);
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  margin: 14px 0;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 0.96rem;
  color: var(--primary);
  text-align: left;
  direction: ltr;
}

.asm-code, pre.asm-code {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 14px 0;
  direction: ltr;
  text-align: left;
  font-size: 0.9rem;
  line-height: 1.65;
  border: 1px solid #334155;
  position: relative;
}

.diagram-box {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 18px;
  margin: 16px 0;
  overflow-x: auto;
}

/* ==================== الأمثلة المحلولة ==================== */
.example-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-top: 4px solid var(--accent);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.example-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.example-title-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.example-badge {
  background: var(--accent);
  color: #fff;
  font-weight: 800;
  font-size: 0.8rem;
  padding: 3px 11px;
  border-radius: 6px;
}

.example-header h4 {
  font-size: 1.12rem;
  font-weight: 800;
}

.example-problem {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin-bottom: 14px;
}

.example-solution {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
}

.example-solution-label {
  font-weight: 800;
  color: var(--success);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ==================== الأسئلة المتوقعة والاختبارات ==================== */
.qa-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.qa-question-bar {
  padding: 16px 20px;
  background: var(--bg-surface);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  transition: background 0.15s;
}

.qa-question-bar:hover {
  background: var(--bg-surface-alt);
}

.qa-q-left {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.qa-badge {
  background: var(--rule-bg);
  color: var(--rule-color);
  border: 1px solid var(--rule-border);
  font-weight: 800;
  font-size: 0.76rem;
  padding: 3px 10px;
  border-radius: 6px;
  white-space: nowrap;
  margin-top: 2px;
}

.qa-question-text {
  font-weight: 800;
  font-size: 1rem;
  color: var(--text-main);
}

.qa-toggle-btn {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-soft);
  padding: 5px 12px;
  border-radius: 6px;
  white-space: nowrap;
}

.qa-answer-body {
  padding: 18px 22px;
  border-top: 1px solid var(--border-color);
  background: var(--bg-surface-alt);
}

/* بطاقات الاختيار من متعدد (Interactive Quiz) */
.quiz-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}

.quiz-q-title {
  font-weight: 800;
  font-size: 1.02rem;
  margin-bottom: 14px;
  display: flex;
  gap: 10px;
}

.quiz-options-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 10px;
}

.quiz-opt-btn {
  padding: 11px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-surface-alt);
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  text-align: right;
  cursor: pointer;
  transition: all 0.15s;
}

.quiz-opt-btn:hover:not(:disabled) {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.quiz-opt-btn.correct {
  background: var(--success-bg);
  border-color: var(--success);
  color: var(--success);
  font-weight: 800;
}

.quiz-opt-btn.wrong {
  background: var(--danger-bg);
  border-color: var(--danger);
  color: var(--danger);
}

.quiz-explanation {
  margin-top: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--primary-soft);
  border-right: 4px solid var(--primary);
  font-size: 0.88rem;
}

/* ==================== معرض صفحات الدفتر الأصلية داخل الدرس ==================== */
.pages-gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 16px;
  margin-top: 14px;
}

.page-thumb-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.page-thumb-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.page-thumb-card img {
  width: 100%;
  height: 270px;
  object-fit: cover;
  object-position: top center;
  display: block;
  border-bottom: 1px solid var(--border-color);
}

.page-thumb-caption {
  padding: 10px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.84rem;
  font-weight: 700;
}

/* شريط التنقل السفلي بين الدروس */
.lesson-bottom-nav {
  margin-top: 36px;
  padding: 22px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
}

/* ==================== واجهة بنك الأسئلة والمختبر وعارض الدفتر ==================== */
.section-header-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  box-shadow: var(--shadow-sm);
}

.exambank-controls {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  margin-bottom: 22px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.control-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-secondary);
}

.control-group select, .control-group input {
  width: 100%;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-surface-alt);
  color: var(--text-main);
  font-family: inherit;
}

.lab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(480px, 1fr));
  gap: 22px;
}

.lab-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.lab-card h3 {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--primary);
}

.lab-desc {
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.form-row {
  margin-bottom: 14px;
}

.form-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 16px;
}

.lab-form label {
  display: block;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 5px;
}

.lab-form input, .lab-form select {
  width: 100%;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-surface-alt);
  color: var(--text-main);
  font-family: inherit;
  font-weight: 600;
}

.lab-result-box {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 16px;
  font-size: 0.9rem;
}

/* ==================== نافذة عرض الصور (Modal Lightbox) ==================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.82);
  backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.modal-card {
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  max-width: 980px;
  width: 100%;
  max-height: 92vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.modal-title-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.modal-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.modal-counter {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 0.9rem;
}

.modal-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  text-align: center;
  background: var(--bg-body);
}

.modal-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
}

.notebook-jumper {
  display: flex;
  align-items: center;
  gap: 10px;
}

.notebook-jumper input {
  width: 90px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  text-align: center;
}

/* ==================== الجسر ثنائي اللغة وامتحانات الوحدات وأسئلة السنوات ==================== */
.bilingual-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--accent);
  background: var(--accent-light);
  color: var(--accent);
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 800;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.bilingual-toggle-btn:hover {
  background: var(--accent);
  color: #ffffff;
}

.bilingual-toggle-btn.off {
  border-color: var(--border-strong);
  background: var(--bg-surface-alt);
  color: var(--text-muted);
}

/* عند إيقاف المساعد العربي لاختبار النفس بالإنجليزي الصرف أو عند الإخفاء الفردي */
body.hide-ar-assist .ar-assist-box:not(.force-show),
.ar-assist-box.force-hide {
  display: none !important;
}

.ar-assist-box.force-show {
  display: block !important;
}

.show-single-ar-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  font-size: 0.76rem;
  font-weight: 700;
  border-radius: 6px;
  border: 1px dashed var(--accent);
  background: var(--accent-light);
  color: var(--accent);
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
}

.show-single-ar-btn:hover {
  background: var(--accent);
  color: #ffffff;
}

.ar-toast-banner {
  position: fixed;
  bottom: 24px;
  left: 24px;
  z-index: 3500;
  background: #0f172a;
  color: #ffffff;
  border-right: 5px solid var(--accent);
  padding: 12px 20px;
  border-radius: 10px;
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  font-weight: 800;
}

/* زر امتحان الوحدة في القائمة الجانبية والفهرس */
.sb-unit-exam-btn {
  margin: 6px 8px 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--primary-soft), var(--accent-light));
  border: 1px solid var(--primary);
  color: var(--primary);
  font-weight: 800;
  font-size: 0.84rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.2s;
}

.sb-unit-exam-btn:hover, .sb-unit-exam-btn.active {
  background: var(--primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.unit-exam-banner-card {
  margin: 0 18px 18px;
  padding: 16px 22px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary-soft), var(--accent-light));
  border: 2px solid var(--primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
}

/* بطاقة شيفرة الامتحان الإنجليزي داخل كل درس */
.bilingual-bridge-card {
  background: var(--bg-surface);
  border: 2px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.bilingual-bridge-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border-color);
}

.bilingual-summary-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 16px;
}

.bilingual-summary-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-strong);
  align-items: center;
}

.bilingual-summary-en {
  direction: ltr;
  text-align: left;
  font-family: 'JetBrains Mono', sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
  padding-left: 8px;
  border-left: 3px solid var(--primary);
}

.bilingual-summary-ar {
  direction: rtl;
  text-align: right;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-main);
}

/* شريط اختيار الوحدة في صفحة امتحانات الوحدات */
.unit-selector-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
  background: var(--bg-surface);
  padding: 14px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.unit-selector-btn {
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-surface-alt);
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.86rem;
  font-weight: 800;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 8px;
}

.unit-selector-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-soft);
}

.unit-selector-btn.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

/* ترويسة ورقة الامتحان الجامعي */
.exam-paper-header {
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  color: #ffffff;
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 24px;
  border-right: 6px solid var(--accent);
  box-shadow: var(--shadow-md);
}

.exam-paper-header h3 {
  font-size: 1.4rem;
  font-weight: 900;
  margin-bottom: 6px;
  color: #ffffff;
}

.exam-paper-header .en-subtitle {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  color: #93c5fd;
  direction: ltr;
  text-align: left;
  margin-bottom: 12px;
}

/* صندوق السؤال بالإنجليزي البحت + صندوق المساعد العربي */
.en-question-box {
  direction: ltr !important;
  text-align: left !important;
  background: #f8fafc;
  border: 2px solid #cbd5e1;
  border-left: 5px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin-bottom: 12px;
  font-family: 'JetBrains Mono', 'Segoe UI', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  color: #0f172a;
  line-height: 1.65;
}

[data-theme="dark"] .en-question-box {
  background: #0f172a;
  border-color: #334155;
  border-left-color: var(--primary);
  color: #f1f5f9;
}

.ar-assist-box {
  direction: rtl;
  text-align: right;
  background: var(--accent-light);
  border: 1px solid var(--success-border);
  border-right: 4px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 11px 16px;
  margin-bottom: 14px;
  font-size: 0.89rem;
  color: var(--text-main);
}

.keywords-clue-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}

.keyword-clue-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-surface);
  border: 1px solid var(--primary);
  border-radius: 6px;
  padding: 3px 10px;
  font-size: 0.8rem;
  font-weight: 700;
}

.keyword-clue-chip .en-kw {
  font-family: 'JetBrains Mono', monospace;
  color: var(--primary);
  direction: ltr;
  unicode-bidi: isolate;
}

.keyword-clue-chip .ar-kw {
  color: var(--accent);
}

/* بطاقات تتبع الكود (Code Tracing) والبرمجة في الامتحان */
.trace-problem-card, .coding-problem-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-top: 4px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.trace-interactive-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 14px 0;
  padding: 12px 16px;
  background: var(--bg-surface-alt);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.trace-input {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-strong);
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 0.92rem;
  direction: ltr;
  text-align: left;
  min-width: 240px;
  background: var(--bg-surface);
  color: var(--text-main);
}

/* قاموس شيفرات الامتحان الإنجليزي */
.decoder-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.decoder-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-top: 4px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.decoder-en-phrase {
  direction: ltr;
  text-align: left;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 800;
  font-size: 0.96rem;
  color: var(--primary);
  background: var(--primary-soft);
  padding: 8px 12px;
  border-radius: 6px;
}

/* ==================== التحديث التنظيمي الشامل: نظام الملاحظات والعلامات المرجعية وخريطة الميد ==================== */

.nav-counter-pill {
  background: #dc2626;
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 900;
  padding: 1px 7px;
  border-radius: 99px;
  margin-right: 4px;
}

.font-size-controls {
  display: inline-flex;
  gap: 4px;
}

.font-btn {
  width: 34px;
  height: 34px;
  font-size: 0.78rem;
  font-weight: 900;
  font-family: 'Cairo', sans-serif;
}

.chip-mini-btn {
  padding: 2px 8px;
  font-size: 0.72rem;
  font-weight: 700;
  font-family: inherit;
  border-radius: 6px;
  border: 1px solid var(--border-strong);
  background: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
}

.chip-mini-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.chip-btn.mid-chip.active {
  background: #dc2626;
  border-color: #dc2626;
  color: #fff;
}

.chip-btn.review-chip.active {
  background: #d97706;
  border-color: #d97706;
  color: #fff;
}

/* تنسيق هادئ ومرتب جداً لعناصر القائمة الجانبية */
.sb-lesson-item {
  padding: 8px 10px;
  align-items: center;
  gap: 9px;
}

.sb-lesson-row-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
  margin-top: 3px;
}

.sb-page-pill {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 700;
}

.mid-badge-mini {
  font-size: 0.66rem;
  font-weight: 800;
  padding: 1px 6px;
  border-radius: 4px;
  background: #fef2f2;
  color: #dc2626;
  border: 1px solid #fecaca;
}

.opt-mid-badge-mini {
  font-size: 0.66rem;
  font-weight: 800;
  padding: 1px 6px;
  border-radius: 4px;
  background: #fffbeb;
  color: #d97706;
  border: 1px solid #fde68a;
}

.final-badge-mini {
  font-size: 0.66rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--bg-surface-alt);
  color: var(--text-muted);
}

.sb-status-icons {
  display: inline-flex;
  gap: 3px;
  font-size: 0.76rem;
}

/* بطاقة تحديد مادة امتحان الميد في أعلى الفهرس */
.midterm-scope-banner {
  background: var(--bg-surface);
  border: 2px solid var(--primary);
  border-radius: var(--radius-lg);
  padding: 22px 26px;
  margin-bottom: 22px;
  box-shadow: var(--shadow-sm);
}

.scope-badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}

.scope-pill-fire {
  background: #fef2f2;
  color: #dc2626;
  border: 1px solid #fecaca;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: 99px;
}

.scope-pill-info {
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 99px;
}

.midterm-scope-main h2 {
  font-size: 1.35rem;
  font-weight: 900;
  margin-bottom: 14px;
  color: var(--text-main);
}

.scope-grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 16px;
  margin-bottom: 18px;
}

.scope-box {
  padding: 16px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-strong);
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}

.scope-box:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.scope-box.core-mid {
  background: #fff1f2;
  border-color: #fda4af;
  border-right: 5px solid #dc2626;
}

[data-theme="dark"] .scope-box.core-mid {
  background: rgba(220, 38, 38, 0.12);
  border-color: rgba(220, 38, 38, 0.4);
}

.scope-box.opt-mid {
  background: #fffbeb;
  border-color: #fde68a;
  border-right: 5px solid #d97706;
}

[data-theme="dark"] .scope-box.opt-mid {
  background: rgba(217, 119, 6, 0.12);
  border-color: rgba(217, 119, 6, 0.4);
}

.scope-box-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 0.94rem;
}

.scope-box p {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.midterm-quick-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
}

.quick-bar-right, .quick-bar-left {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

/* شريط أدوات النقطة (ملاحظة + علامة مرجعية + نقطة تحتاج مراجعة) على أي فقرة أو مثال أو سؤال */
.point-tools-bar {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.point-tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid var(--border-strong);
  background: var(--bg-surface-alt);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.76rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
}

.point-tool-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-soft);
}

.point-tool-btn.active-review {
  background: #fef3c7;
  border-color: #d97706;
  color: #b45309;
  font-weight: 800;
}

.point-tool-btn.active-bookmark {
  background: #dbeafe;
  border-color: #2563eb;
  color: #1d4ed8;
  font-weight: 800;
}

.point-tool-btn.active-note {
  background: #fef9c3;
  border-color: #ca8a04;
  color: #854d0e;
  font-weight: 800;
}

/* تمييز البطاقات التي حددها الطالب كـ "تحتاج مراجعة" أو "علامة مرجعية" */
.needs-review-card {
  border: 2px solid #f59e0b !important;
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.12) !important;
}

.bookmarked-card {
  border-right: 5px solid var(--primary) !important;
}

@keyframes flashHighlight {
  0% { box-shadow: 0 0 0 6px rgba(37, 99, 235, 0.45); }
  100% { box-shadow: none; }
}

.flash-target-card {
  animation: flashHighlight 2.2s ease-out;
}

/* صندوق الملاحظة الشخصية الملصقة (Sticky Note) ومحرر الملاحظة الموضعي */
.my-sticky-note {
  margin-top: 14px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: #fef9c3;
  border: 1px solid #fde047;
  border-right: 5px solid #eab308;
  color: #713f12;
  font-size: 0.9rem;
}

[data-theme="dark"] .my-sticky-note {
  background: rgba(234, 179, 8, 0.15);
  border-color: rgba(234, 179, 8, 0.4);
  color: #fef08a;
}

.my-sticky-note-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
  font-weight: 800;
  font-size: 0.82rem;
}

.inline-note-editor {
  margin-top: 12px;
  padding: 14px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-alt);
  border: 2px dashed #eab308;
}

.inline-note-editor textarea {
  width: 100%;
  min-height: 78px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-surface);
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.9rem;
  resize: vertical;
  margin-bottom: 8px;
}

/* النافذة العائمة عند تظليل أي نص بالماوس */
.selection-popup {
  position: fixed;
  z-index: 3000;
  background: #0f172a;
  color: #ffffff;
  padding: 6px 8px;
  border-radius: 10px;
  box-shadow: var(--shadow-lg);
  display: flex;
  gap: 6px;
  border: 1px solid #334155;
}

.selection-popup button {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
  border: none;
  padding: 5px 10px;
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}

.selection-popup button:hover {
  background: var(--primary);
}

/* واجهة مركز مراجعتي وملاحظاتي (Personal Study Hub) */
.hub-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.hub-stat-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.hub-stat-box:hover, .hub-stat-box.active {
  border-color: var(--primary);
  background: var(--primary-soft);
  box-shadow: var(--shadow-sm);
}

.hub-stat-num {
  font-size: 1.65rem;
  font-weight: 900;
  font-family: 'JetBrains Mono', monospace;
  color: var(--primary);
}

.hub-item-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  margin-bottom: 14px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.hub-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

/* بطاقات الحفظ السريع (Flashcards) */
.flashcards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

.flashcard-item {
  background: var(--bg-surface);
  border: 2px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 20px;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
}

.flashcard-item:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.flashcard-front {
  font-weight: 800;
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 10px;
}

.flashcard-back {
  padding-top: 10px;
  border-top: 1px dashed var(--border-strong);
  font-size: 0.9rem;
  color: var(--text-main);
}

@media (max-width: 1080px) {
  .hero-banner {
    grid-template-columns: 1fr;
  }
  .sidebar {
    transform: translateX(100%);
  }
  .sidebar.mobile-open {
    transform: translateX(0);
  }
  .main-content {
    margin-right: 0;
    padding: 20px 16px 50px;
  }
  .lab-grid {
    grid-template-columns: 1fr;
  }
  .bilingual-summary-item {
    grid-template-columns: 1fr;
  }
}