:root {
  --bs-primary-rgb: 99, 102, 241;
  --bs-success-rgb: 16, 185, 129;
  --bs-warning-rgb: 245, 158, 11;
  --bs-danger-rgb: 239, 68, 68;
  --bs-info-rgb: 14, 165, 233;
  --primary-400: #818cf8;
  --primary-500: #6366f1;
  --primary-600: #4f46e5;
  --primary-700: #4338ca;
  --secondary-400: #2dd4bf;
  --secondary-500: #14b8a6;
  --secondary-600: #0d9488;
  --accent-400: #c084fc;
  --accent-500: #a855f7;
  --accent-600: #9333ea;
  --gold-400: #fbbf24;
  --gold-500: #f59e0b;
  --bg-primary: #030712;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  --bg-card: #111827;
  --bg-elevated: #1f2937;
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-muted: #9ca3af;
  --border-color: #374151;
  --border-light: #4b5563;
  --glow-primary: rgba(99, 102, 241, 0.4);
  --glow-secondary: rgba(20, 184, 166, 0.3);
}

[data-bs-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-tertiary: #e2e8f0;
  --bg-card: #f1f5f9;
  --bg-elevated: #f8fafc;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border-color: #e2e8f0;
  --border-light: #cbd5e1;
  --glow-primary: rgba(99, 102, 241, 0.2);
  --glow-secondary: rgba(20, 184, 166, 0.15);
}

[data-bs-theme="dark"] {
  --bs-body-bg: #030712;
  --bs-body-color: #f9fafb;
  --bs-card-bg: #111827;
  --bs-border-color: #374151;
}

.content-wrapper {
  padding-top: 0;
  padding-bottom: 0;
}

.lesson-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.lesson-container,
.lesson-container .card,
.lesson-container .lesson-body {
  font-family: "IBM Plex Sans Arabic", "Cairo", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Roboto, "Noto Sans Arabic", sans-serif;
}

.lesson-container pre,
.lesson-container .CodeMirror {
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.lesson-container code {
  font-family: var(--font-family);
}

.lesson-hero {
  border: 1px solid var(--border-color);
  border-radius: 0;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
  margin-bottom: 2rem;
  min-height: 45vh;
  width: 100vw;
  position: relative;
  left: 50%;
  right: 50%;
  margin-left: -50vw;
  margin-right: -50vw;
  border-left: 0;
  border-right: 0;
}

[data-bs-theme="light"] .lesson-hero {
  background: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 100%);
  box-shadow: 0 4px 24px rgba(99, 102, 241, 0.12);
}

.lesson-hero-inner {
  max-width: 56rem;
  margin: 0 auto;
  padding: 0 1rem 2.5rem;
  min-height: 50vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

.lesson-hero-breadcrumb .breadcrumb {
  padding: 0;
  margin-bottom: 1rem;
}

.lesson-hero-breadcrumb {
  font-size: 0.875rem;
}

.lesson-hero-breadcrumb .breadcrumb-item + .breadcrumb-item::before {
  float: none;
  padding: 0 0.75rem;
  color: var(--text-tertiary);
  content: var(--bs-breadcrumb-divider, ">");
  font-size: inherit;
  line-height: inherit;
}

.lesson-hero-breadcrumb .breadcrumb-item a {
  color: var(--text-secondary);
  text-decoration: none;
}

.lesson-hero-breadcrumb .breadcrumb-item a:hover {
  color: var(--primary-400);
}

.lesson-hero-breadcrumb .breadcrumb-item.active {
  color: var(--primary-400);
  font-weight: 700;
}

[data-bs-theme="light"] .lesson-hero-breadcrumb .breadcrumb-item.active {
  color: var(--primary-600);
}

.lesson-hero-header {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.lesson-hero-title {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  margin: 0;
  margin-top: 1.25rem;
  margin-bottom: 1.25rem;
  text-shadow: 0 2px 12px var(--glow-primary);
}

@media (min-width: 768px) {
  .lesson-hero-title {
    font-size: 3.75rem;
  }
}

.lesson-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.lesson-header-card {
  background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
  border: none;
  border-radius: 1rem;
  padding: 2.5rem;
  margin-bottom: 2rem;
  box-shadow: 0 10px 30px rgba(30, 64, 175, 0.3);
}

[data-bs-theme="dark"] .lesson-header-card {
  background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 100%);
  box-shadow: 0 10px 30px rgba(30, 58, 138, 0.5);
}

.lesson-title {
  color: #ffffff;
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.lesson-title i {
  font-size: 2rem;
  color: #fbbf24;
}

.lesson-meta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  background: var(--bg-elevated);
  backdrop-filter: blur(12px);
  border-radius: 2rem;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.meta-badge i {
  color: var(--secondary-400);
}

[data-bs-theme="light"] .meta-badge {
  background: var(--bg-secondary);
  border-color: var(--border-light);
}

.lesson-content-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1.25rem;
  padding: 2.5rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

[data-bs-theme="light"] .lesson-content-card {
  background: var(--bg-card);
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.08);
}

.lesson-body {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 1.05rem;
}

.lesson-body h1,
.lesson-body h2,
.lesson-body h3,
.lesson-body h4 {
  color: var(--text-primary);
  font-weight: 700;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.lesson-body h2 {
  font-size: 1.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 3px solid var(--border-color);
}

.lesson-body p {
  margin-bottom: 1.25rem;
}

.lesson-body ul,
.lesson-body ol {
  margin-bottom: 1.25rem;
  padding-right: 2rem;
}

.lesson-body li {
  margin-bottom: 0.5rem;
}

.lesson-body code {
  background: var(--bg-tertiary);
  color: var(--primary-400);
  padding: 0.2rem 0.5rem;
  border-radius: 0.35rem;
  font-family: var(--font-family);
}

[data-bs-theme="dark"] .lesson-body code {
	background: rgba(15, 23, 42, 0.55);
	color: #e685b5;
}

[data-bs-theme="light"] .lesson-body code {
	color: #d63384;
}

.lesson-body pre {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1.5rem;
  margin: 1.5rem 0;
  overflow-x: auto;
}

.lesson-body pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.lesson-body blockquote {
  border-right: 4px solid var(--primary-500);
  padding: 1rem 1.5rem;
  background: var(--bg-tertiary);
  border-radius: 0 0.5rem 0.5rem 0;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--text-secondary);
}

.lesson-body a {
  color: var(--primary-400);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.lesson-body a:hover {
  color: var(--secondary-400);
}

[data-bs-theme="light"] .lesson-body a {
  color: var(--primary-600);
}

[data-bs-theme="light"] .lesson-body a:hover {
  color: var(--primary-700);
}

.lesson-navigation {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 2px solid var(--border-color);
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.75rem;
  background: var(--bg-elevated);
  border: 2px solid var(--border-color);
  border-radius: 0.75rem;
  color: var(--text-primary);
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.nav-btn:hover {
  background: var(--primary-600);
  border-color: var(--primary-600);
  color: #ffffff;
  box-shadow: 0 8px 20px var(--glow-primary);
}

.nav-btn i {
  font-size: 1.25rem;
}

.nav-placeholder {
  width: 120px;
}

.editor-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.editor-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.editor-controls {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  padding: 1rem;
  background: var(--bg-tertiary);
  border-radius: 0.75rem;
  border: 1px solid var(--border-color);
}

.editor-container {
  background: linear-gradient(180deg, #0c0f1a 0%, #111827 100%);
  border-radius: 0.875rem;
  overflow: hidden;
  position: relative;
  border: 2px solid var(--border-color);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.editor-container:hover {
  border-color: var(--primary-500);
  box-shadow: 0 12px 32px var(--glow-primary), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.editor-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary-500), transparent);
  z-index: 1;
}

.editor-container .CodeMirror {
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 1.05rem;
  line-height: 1.6;
  padding-left: 52px;
  background: transparent;
  font-variant-ligatures: none;
  font-feature-settings: normal;
}

.editor-container .CodeMirror pre,
.editor-container .CodeMirror-code,
.editor-container .CodeMirror-line {
  font-variant-ligatures: none !important;
  font-feature-settings: normal !important;
}

.editor-container .cm-punc {
  display: inline-block;
  padding-inline: 0.09em;
}

.editor-container .cm-qopen {
  padding-inline-end: 0.09em;
}

.editor-container .cm-qclose {
  padding-inline-start: 0.09em;
}

 .editor-container .CodeMirror pre,
 .example-code-editor .CodeMirror pre {
   white-space: pre;
 }

 .editor-container .CodeMirror-scroll,
 .example-code-editor .CodeMirror-scroll {
   overflow-x: auto !important;
   overflow-y: auto !important;
 }

 .editor-container .CodeMirror-line,
 .example-code-editor .CodeMirror-line {
   padding-left: 0.15rem !important;
   padding-right: 0.15rem !important;
 }

.rtl-mode .CodeMirror {
  padding-left: 0;
  padding-right: 52px;
}

.rtl-mode .custom-line-numbers {
  left: auto;
  right: 0;
  border-right: none;
  border-left: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: inset 1px 0 0 rgba(255, 255, 255, 0.05);
}

 .example-code-wrapper .rtl-mode .custom-line-numbers {
   border-left: 0;
   box-shadow: none;
 }

.custom-line-numbers {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 50px;
  z-index: 2;
  background: linear-gradient(180deg, #0c0f1a 0%, #111827 100%);
  color: var(--text-muted);
  padding: 0 0.5rem;
  padding-bottom: 0;
  text-align: center;
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.9rem;
  user-select: none;
  border-right: 1px solid var(--border-color);
  overflow: hidden;
  box-shadow: inset -1px 0 0 rgba(255, 255, 255, 0.1);
 }

 .example-code-wrapper .custom-line-numbers {
   border-right: 0;
   border-left: 0;
   box-shadow: none;
 }

 .example-code-wrapper .ltr-mode .custom-line-numbers {
   border-right: 1px solid rgba(255, 255, 255, 0.85);
 }

 .example-code-wrapper .rtl-mode .custom-line-numbers {
   border-left: 1px solid rgba(255, 255, 255, 0.85);
 }

 .custom-line-numbers {
   display: flex;
   flex-direction: column;
 }

.custom-line-number {
  display: flex;
  align-items: center;
  justify-content: center;
}

.custom-line-number-inner {
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.editor-indent-warning {
  display: none;
  font-size: 0.9rem;
  color: #dc2626;
  padding: 0.75rem 1rem;
  background: rgba(239, 68, 68, 0.12);
  border-radius: 0.625rem;
  border: 2px solid rgba(239, 68, 68, 0.35);
  margin-bottom: 1rem;
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.15);
  position: relative;
  padding-right: 2.5rem;
  font-family: "IBM Plex Sans Arabic", "Cairo", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Roboto, "Noto Sans Arabic", sans-serif;
}

[data-bs-theme="light"] .editor-indent-warning {
  background: rgba(239, 68, 68, 0.18);
  border-color: rgba(185, 28, 28, 0.55);
  color: #7f1d1d;
}

.editor-indent-warning::before {
  content: '⚠';
  position: absolute;
  right: 0.75rem;
  top: 0.75rem;
  font-size: 1.25rem;
  color: #ef4444;
}

[data-bs-theme="dark"] .editor-indent-warning {
  background: linear-gradient(135deg, #450a0a 0%, #7f1d1d 100%);
  border-color: #991b1b;
  color: #fca5a5;
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
}

.cm-indent-error {
  background-color: rgba(239, 68, 68, 0.35);
}

.cm-indent-ok {
  background-color: rgba(34, 197, 94, 0.18);
}

.cm-indent-ok-4 {
  background-color: rgba(34, 197, 94, 0.35);
}

.cm-indent-warning {
  background-color: rgba(234, 179, 8, 0.45);
}

.output-panel {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 0.875rem;
  padding: 1.5rem;
  margin-top: 1.5rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  position: relative;
  overflow: hidden;
}

.output-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, #3b82f6 0%, #06b6d4 100%);
}

[data-bs-theme="dark"] .output-panel {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  border-color: #334155;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
  font-family: "IBM Plex Sans Arabic", "Cairo", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Roboto, "Noto Sans Arabic", sans-serif;
}

[data-bs-theme="dark"] .output-header {
  border-bottom-color: #334155;
}

.output-content {
  background: var(--bg-secondary);
  padding: 1.25rem;
  border-radius: 0.625rem;
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  white-space: pre-wrap;
  color: var(--text-primary);
  min-height: 120px;
  max-height: 400px;
  overflow-y: auto;
  border: 2px solid var(--border-color);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.04);
}

.output-content:hover {
  border-color: var(--border-light);
}

[data-bs-theme="dark"] .output-content {
  background: #1e293b;
  color: #cbd5e1;
  border-color: #334155;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.output-content.output-neutral {
  color: #334155;
}

[data-bs-theme="dark"] .output-content.output-neutral {
  color: #cbd5e1;
}

.output-content.output-success {
  color: #16a34a;
}

[data-bs-theme="dark"] .output-content.output-success {
  color: #4ade80;
}

.output-content.output-error {
  color: #dc2626;
}

[data-bs-theme="dark"] .output-content.output-error {
  color: #f87171;
}

.example-code-wrapper {
  margin: 2rem 0;
  position: relative;
  isolation: isolate;
}

 .example-code-wrapper > * {
   position: relative;
   z-index: 1;
 }

.example-toolbar {
  align-items: center;
  direction: rtl;
}

.example-toolbar .btn {
  height: 38px;
}

.example-code-wrapper::before {
  content: '';
  position: absolute;
  top: -14px;
  left: -14px;
  right: -14px;
  bottom: -14px;
  background: linear-gradient(135deg, var(--secondary-500) 0%, var(--primary-500) 50%, var(--accent-500) 100%);
  border-radius: 1.5rem;
  opacity: 0.12;
  z-index: 0;
}

.example-code-wrapper:hover::before {
  opacity: 0.15;
}

.example-code-editor {
  background: linear-gradient(180deg, #0c0f1a 0%, #111827 100%);
  border-radius: 0.875rem;
  overflow: hidden;
  position: relative;
  border: 2px solid var(--border-color);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.03);
  padding: 6px;
}

 .example-code-wrapper .example-code-editor {
   border: 0;
   box-shadow: none;
   padding: 0;
 }

.example-code-editor:hover {
  border-color: var(--primary-500);
  box-shadow: 0 12px 32px var(--glow-primary), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

 .example-code-wrapper .example-code-editor:hover {
   border-color: transparent;
   box-shadow: none;
 }

.example-code-editor::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary-500), transparent);
  z-index: 1;
}

.example-code-editor .CodeMirror {
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  background: transparent;
  font-variant-ligatures: none;
  font-feature-settings: normal;
}

.example-code-editor .CodeMirror pre,
.example-code-editor .CodeMirror-code,
.example-code-editor .CodeMirror-line {
  font-variant-ligatures: none !important;
  font-feature-settings: normal !important;
}

.example-code-editor .cm-punc {
  display: inline-block;
  padding-inline: 0.09em;
}

.example-code-editor .cm-qopen {
  padding-inline-end: 0.09em;
}

.example-code-editor .cm-qclose {
  padding-inline-start: 0.09em;
}

.example-code-editor .CodeMirror,
.editor-container .CodeMirror {
  padding-top: 0.5rem;
  padding-bottom: 0;
}

.example-code-editor .CodeMirror {
  height: auto;
}

.example-code-editor .CodeMirror-scroll {
  overflow-y: auto !important;
  overflow-x: auto !important;
}

.example-code-editor .CodeMirror-hscrollbar,
.example-code-editor .CodeMirror-vscrollbar {
  display: none !important;
}

.example-output-box {
  background: var(--bs-tertiary-bg);
  border: 1px solid var(--bs-border-color);
  border-radius: 8px;
  padding: 2px;
  margin-top: 0.75rem;
  font-family: "IBM Plex Sans Arabic", "Cairo", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Roboto, "Noto Sans Arabic", sans-serif;
  box-shadow: none;
  position: relative;
}

 .example-output-box .output-header {
   margin-bottom: 0;
 }

 .example-output-box .output-header {
   padding-top: 0.25rem;
   padding-bottom: 0.25rem;
 }

 .example-output-box .output-inner {
   padding-top: 0.5rem;
   padding-bottom: 0.5rem;
 }

 .example-output-box .output-inner {
   white-space: pre-wrap;
 }

 .example-output-box .output-inner pre {
   background: transparent;
   border: 0;
   padding: 0;
 }

.output-toggle-btn {
  position: absolute;
  top: 0.75rem;
}

 .example-output-box .output-header .output-toggle-btn {
   position: static;
   top: auto;
   left: auto;
   right: auto;
 }

.example-output-box.output-rtl .output-toggle-btn {
  left: 0.75rem;
  right: auto;
}

.example-output-box.output-ltr .output-toggle-btn {
  right: 0.75rem;
  left: auto;
}

.output-inner {
  margin-top: 0;
}



[data-bs-theme="dark"] .example-output-box {
  background: var(--bs-tertiary-bg);
  border-color: var(--bs-border-color);
  box-shadow: none;
}

.example-output-box pre {
  margin: 0;
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  white-space: pre-wrap;
}

.example-output-box.output-ltr pre {
  padding-left: 60px;
  padding-right: 0;
}

.example-output-box.output-rtl pre {
  padding-right: 60px;
  padding-left: 0;
}

.validation-panel {
  border-radius: 0.875rem;
  padding: 1.75rem;
  margin-top: 1.5rem;
  border: 2px solid;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
  position: relative;
  overflow: hidden;
}

.validation-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 100%;
}

.validation-panel.validation-success {
  background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
  border-color: #22c55e;
  color: #166534;
}

.validation-panel.validation-success::before {
  background: linear-gradient(180deg, #22c55e 0%, #16a34a 100%);
}

[data-bs-theme="dark"] .validation-panel.validation-success {
  background: linear-gradient(135deg, #022c22 0%, #14532d 100%);
  color: #86efac;
}

.validation-panel.validation-error {
  background: rgba(239, 68, 68, 0.12);
  border-color: #ef4444;
  color: #991b1b;
}

.validation-panel.validation-error::before {
  background: linear-gradient(180deg, #ef4444 0%, #dc2626 100%);
}

[data-bs-theme="dark"] .validation-panel.validation-error {
  background: linear-gradient(135deg, #450a0a 0%, #7f1d1d 100%);
  color: #fca5a5;
}

.validation-panel.validation-warning {
  background: rgba(234, 179, 8, 0.14);
  border-color: #f59e0b;
  color: #92400e;
}

.validation-panel.validation-warning::before {
  background: linear-gradient(180deg, #f59e0b 0%, #d97706 100%);
}

[data-bs-theme="dark"] .validation-panel.validation-warning {
  background: linear-gradient(135deg, #451a03 0%, #78350f 100%);
  color: #fcd34d;
}

.validation-summary {
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.validation-content {
  font-size: 0.95rem;
}

.validation-checks {
  margin-top: 0.75rem;
}

.validation-check-item {
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

[data-bs-theme="dark"] .validation-check-item {
  border-bottom-color: rgba(255, 255, 255, 0.1);
}

.validation-check-item:last-child {
  border-bottom: none;
}

.validation-stats {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  font-weight: 600;
}

[data-bs-theme="dark"] .validation-stats {
  border-top-color: rgba(255, 255, 255, 0.1);
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.modal-header {
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem;
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  border-top: 1px solid var(--border-color);
  padding: 1.5rem;
}

.form-label {
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.form-control,
.form-select {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  color: var(--text-primary);
  padding: 0.625rem 1rem;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px var(--glow-primary);
  background: var(--bg-elevated);
}

.form-check-input {
  background-color: var(--bg-tertiary);
  border-color: var(--border-color);
}

.form-check-input:checked {
  background-color: var(--primary-500);
  border-color: var(--primary-500);
}

.btn {
  font-weight: 600;
  padding: 0.625rem 1.25rem;
  border-radius: 0.5rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-500) 100%);
  border: none;
  color: #ffffff;
  font-weight: 600;
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 8px var(--glow-primary);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-700) 0%, var(--primary-600) 100%);
  box-shadow: 0 6px 16px var(--glow-primary);
}

.btn-primary:active {
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.btn-outline-secondary {
  border: 2px solid var(--border-color);
  color: var(--text-secondary);
  background: transparent;
  position: relative;
  overflow: hidden;
}

[data-bs-theme="light"] .btn-outline-secondary {
  border-color: rgba(15, 23, 42, 0.2);
  color: rgba(15, 23, 42, 0.7);
}

.btn-outline-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--primary-500);
  color: var(--primary-400);
  box-shadow: 0 4px 12px var(--glow-primary);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .lesson-container {
    padding: 1rem 0.75rem;
  }

  .lesson-header-card {
    padding: 1.75rem 1.25rem;
  }

  .lesson-title {
    font-size: 1.75rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .lesson-content-card {
    padding: 1.5rem 1.25rem;
  }

  .lesson-navigation {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-btn {
    width: 100%;
    justify-content: center;
  }

  .nav-placeholder {
    display: none;
  }

  .editor-controls {
    gap: 0.5rem;
  }

  .btn-sm {
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
  }
}

.ltr-mode .CodeMirror {
  direction: ltr;
  text-align: left;
  padding-left: 52px;
  padding-right: 0;
}

.ltr-mode .custom-line-numbers {
  left: 0;
  right: auto;
  border-right: 1px solid rgba(255, 255, 255, 0.15);
  border-left: none;
  box-shadow: inset -1px 0 0 rgba(255, 255, 255, 0.05);
}

.CodeMirror-rtl {
  direction: rtl !important;
}

.lesson-body pre.code-block,
.lesson-body pre.code-block code {
  user-select: text;
}

.lesson-body pre.code-block {
  background: transparent;
  border: 0;
  padding: 0;
  overflow: visible;
}

.lesson-body pre.code-block > code {
  padding: 0;
}

.CodeMirror {
  overflow: hidden;
}

.CodeMirror-scroll {
  overflow-y: auto;
  overflow-x: auto;
}

.CodeMirror-sizer {
  min-width: 100%;
}

.CodeMirror-hscrollbar,
.CodeMirror-vscrollbar {
  display: none;
}

.editor-container .CodeMirror-selected,
.example-code-editor .CodeMirror-selected {
  background: rgba(59, 130, 246, 0.25);
}

.editor-container .CodeMirror-focused .CodeMirror-selected,
.example-code-editor .CodeMirror-focused .CodeMirror-selected {
  background: rgba(59, 130, 246, 0.35);
}

.CodeMirror-cursor {
  border-left: 2px solid #3b82f6 !important;
}

.CodeMirror-focused .CodeMirror-cursor {
  border-left-color: #60a5fa !important;
}

.btn {
  position: relative;
  z-index: 1;
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.btn-primary:focus {
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3), 0 6px 16px rgba(37, 99, 235, 0.5);
}

.btn-outline-secondary:focus {
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.custom-line-number:hover .custom-line-number-inner {
  color: #60a5fa;
}

.editor-controls {
  backdrop-filter: blur(8px);
}

.CodeMirror-activeline-background {
  background: rgba(59, 130, 246, 0.08) !important;
}