/* ==========================================================================
   Compillo Global Theme & Master Stylesheet (theme.css)
   ========================================================================== */

/* 1. Global Viewport Overflow Fix (Must be on html AND body) */
html, body {
  width: 100%;
  max-width: 100% !important;
  overflow-x: hidden !important;
  position: relative;
}

/* 2. Page App Container Fix */
/* Wraps your page content to force sidebars strictly off-screen */
.app-container, 
.site-wrapper, 
main {
  width: 100%;
  max-width: 100vw;
  overflow-x: hidden !important;
  position: relative;
}


/* --------------------------------------------------------------------------
   1. Theme Variables (Dark, Light, & Custom Presets)
   -------------------------------------------------------------------------- */
:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-code: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --accent-cyan: #06b6d4;
  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --accent-purple: #8b5cf6;
  --accent-red: #ef4444;
  --neon-blue: #38bdf8;
}

/* Dark Theme Default */
:root,
[data-theme="dark"],
[data-theme="theme-dark"] {
  --bg-dark: #090d16;
  --bg-header: #0f172a;
  --bg-sidebar: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #2d3748;
  --bg-footer-bottom: #070a10;
  
  --border-color: #1e293b;
  --border-light: #334155;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --hero-gradient: linear-gradient(180deg, rgba(15, 23, 42, 0.9) 0%, #090d16 100%);
  --hero-title-gradient: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);
  --badge-bg: rgba(6, 182, 212, 0.1);
  --badge-border: rgba(6, 182, 212, 0.3);
  --table-hover-bg: rgba(30, 41, 59, 0.3);
}

/* Light Theme Overrides */
[data-theme="light"],
[data-theme="theme-light"] {
  --bg-dark: #f8fafc;
  --bg-header: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-footer-bottom: #f1f5f9;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;
  --border-color: #e2e8f0;
  --border-light: #cbd5e1;
  --badge-bg: rgba(6, 182, 212, 0.1);
  --badge-border: rgba(6, 182, 212, 0.3);
  --hero-gradient: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  --hero-title-gradient: linear-gradient(135deg, #0f172a 0%, #334155 100%);
  --table-hover-bg: rgba(0, 0, 0, 0.02);
}

/* Emerald Theme */
[data-theme="emerald"] {
  --bg-dark: #064e3b;
  --bg-header: #022c22;
  --bg-card: #047857;
  --bg-card-hover: #065f46;
  --bg-footer-bottom: #022c22;
  --text-main: #ecfdf5;
  --text-muted: #a7f3d0;
  --text-dim: #6ee7b7;
  --border-color: #065f46;
  --border-light: #047857;
  --accent-cyan: #34d399;
}

/* Cyberpunk Theme */
[data-theme="cyberpunk"],
[data-theme="theme-cyberpunk"] {
  --bg-dark: #120e24;
  --bg-header: #0f001e;
  --bg-card: #1d173b;
  --bg-card-hover: #2a004f;
  --bg-footer-bottom: #090614;
  --text-main: #00f0ff;
  --text-muted: #ff007f;
  --text-dim: #b50060;
  --border-color: #ff007f;
  --border-light: #ff3399;
  --accent-cyan: #ff007f;
}

/* Sunset Theme */
[data-theme="sunset"] {
  --bg-dark: #2d1216;
  --bg-header: #1c0a0c;
  --bg-card: #421a20;
  --bg-card-hover: #542229;
  --bg-footer-bottom: #1c0a0c;
  --text-main: #fff7ed;
  --text-muted: #fdba74;
  --text-dim: #fb923c;
  --border-color: #542229;
  --border-light: #7c2d37;
  --accent-cyan: #f97316;
}

/* --------------------------------------------------------------------------
   2. Base Reset & Typography
   -------------------------------------------------------------------------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color 0.2s ease, color 0.2s ease;
}

main.main-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  width: 100%;
}

/* --------------------------------------------------------------------------
   3. Header Navigation & Multi-Line Responsive Layout
   -------------------------------------------------------------------------- */
header,
header.site-header {
  background-color: var(--bg-header);
  border-bottom: 1px solid var(--border-color);
  min-height: 3.5rem;
  height: auto !important;
  display: flex;
  flex-wrap: wrap; /* Allows header actions to drop to second line on mobile */
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1.25rem;
  gap: 0.75rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-brand-container {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.brand-logo-img {
  height: 25px;
  width: auto;
  display: block;
}

.header-title-link {
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
  text-decoration: none;
  transition: color 0.2s ease;
}

.header-title-link:hover {
  color: var(--accent-cyan);
}

.labs-badge-title {
  font-family: var(--font-code);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--neon-blue);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 3px 10px;
  border-radius: 6px;
  letter-spacing: 0.5px;
}

.header-subtext {
  color: var(--text-muted);
  font-weight: 400;
  font-size: 0.85rem;
}

/* Header Action Group */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.btn-sandbox-header {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--accent-cyan, #38bdf8);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn-sandbox-header:hover {
  background-color: var(--primary, #3b82f6);
  color: #ffffff;
  border-color: var(--primary, #3b82f6);
}

.sandbox-pulse {
  width: 7px;
  height: 7px;
  background-color: #22c55e;
  border-radius: 50%;
  box-shadow: 0 0 0 rgba(34, 197, 94, 0.7);
  animation: pulse-green 1.8s infinite;
}

@keyframes pulse-green {
  0% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.7); }
  70% { box-shadow: 0 0 0 6px rgba(34, 197, 94, 0); }
  100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
}

.theme-dropdown {
  background-color: var(--bg-card, #1e293b);
  color: var(--text-main, #f8fafc);
  border: 1px solid var(--border-light, #334155);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s ease;
}

.theme-dropdown:hover, 
.theme-dropdown:focus {
  border-color: var(--accent-cyan, #38bdf8);
}

/* --------------------------------------------------------------------------
   4. Hero Banner & Stats Grid
   -------------------------------------------------------------------------- */
.hero-section {
  background: var(--hero-gradient);
  border-bottom: 1px solid var(--border-color);
  padding: 3.5rem 1.5rem;
  text-align: center;
  position: relative;
}

.hero-container {
  max-width: 900px;
  margin: 0 auto;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: var(--badge-bg);
  border: 1px solid var(--badge-border);
  color: var(--accent-cyan);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  background: var(--hero-title-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 2rem;
}

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

.btn-primary-lg {
  background-color: var(--primary);
  color: #fff;
  text-decoration: none;
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: background-color 0.2s ease;
}

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

.btn-secondary-lg {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  color: var(--text-main);
  text-decoration: none;
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.btn-secondary-lg:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--accent-cyan);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  max-width: 1000px;
  margin: 2rem auto 0 auto;
  padding-top: 2rem;
  border-top: 1px solid var(--border-light);
}

.stat-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
}

.stat-number {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent-cyan);
  font-family: var(--font-code);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* --------------------------------------------------------------------------
   5. Content Titles & Cards (Modules & Highlights)
   -------------------------------------------------------------------------- */
.section-title-box {
  margin-bottom: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 1rem;
}

.section-title-box h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
}

.section-title-box p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 4px;
}

.modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3.5rem;
}

.module-card {
  background-color: var(--bg-header);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease, border-color 0.2s ease;
  position: relative;
  overflow: hidden;
}

.module-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-light);
}

.module-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--primary);
}

.module-card.mod-1::before { background: var(--accent-cyan); }
.module-card.mod-2::before { background: var(--primary); }
.module-card.mod-3::before { background: var(--accent-green); }
.module-card.mod-4::before { background: var(--accent-amber); }
.module-card.mod-5::before { background: var(--accent-purple); }
.module-card.mod-6::before { background: var(--accent-red); }

.module-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.module-number {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.module-badge-hrs {
  background-color: var(--bg-dark);
  color: var(--accent-cyan);
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: 4px;
  font-family: var(--font-code);
  font-weight: 600;
}

.module-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

.module-summary {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1.25rem;
}

.module-topics-list {
  list-style: none;
  margin-bottom: 1.5rem;
}

.module-topics-list li {
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 4px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.module-topics-list li::before {
  content: '✓';
  color: var(--accent-green);
  font-size: 0.75rem;
}

.btn-module-open {
  display: inline-block;
  text-align: center;
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  color: var(--text-main);
  text-decoration: none;
  padding: 0.6rem 1rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all 0.2s ease;
}

.btn-module-open:hover {
  background-color: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.highlight-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
}

.highlight-card h4 {
  font-size: 1rem;
  color: var(--text-main);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.highlight-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   6. Syllabus & Data Tables
   -------------------------------------------------------------------------- */
.syllabus-section {
  background-color: var(--bg-header);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 3.5rem;
}

.syllabus-table-wrapper {
  overflow-x: auto;
}

.syllabus-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.syllabus-table th {
  background-color: var(--bg-dark);
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
}

.syllabus-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
}

.syllabus-table tr:last-child td {
  border-bottom: none;
}

.syllabus-table tr:hover td {
  background-color: var(--table-hover-bg);
}

.session-link {
  color: var(--accent-cyan);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s ease;
}

.session-link:hover {
  color: var(--primary);
  text-decoration: underline;
}

.status-pill {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 12px;
  font-family: var(--font-code);
  display: inline-block;
}

.status-pill.core {
  background-color: rgba(59, 130, 246, 0.15);
  color: var(--primary);
}

.status-pill.adv {
  background-color: rgba(139, 92, 246, 0.15);
  color: var(--accent-purple);
}

/* --------------------------------------------------------------------------
   7. Site Footer
   -------------------------------------------------------------------------- */
footer.site-footer {
  width: 100%;
  background-color: var(--bg-header);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0 0 0;
  margin-top: auto;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem 2.5rem 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.footer-col h5 {
  color: var(--text-main);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: 0.5px;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 0.6rem;
}

.footer-col ul li a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-col ul li a:hover {
  color: var(--accent-cyan);
}

.foot {
  width: 100%;
  background-color: var(--bg-footer-bottom);
  border-top: 1px solid var(--border-color);
  padding: 1.25rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.foot .heart { color: var(--accent-red); }
.foot .pink-city { color: #ec4899; font-weight: 600; }
.foot .napoli { color: #38bdf8; font-weight: 600; }

/* --------------------------------------------------------------------------
   8. Mobile Responsiveness (as seen in python-editor.php)
   -------------------------------------------------------------------------- */
@media (max-width: 640px) {
  header,
  header.site-header {
    padding: 0.5rem 0.85rem;
  }

  /* Force action container to full width on mobile to wrap into 2nd line */
  .header-actions {
    width: 100%;
    justify-content: space-between;
    padding-top: 6px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
  }

  .btn-sandbox-header {
    flex: 1;
    justify-content: center;
    padding: 5px 10px;
    font-size: 0.75rem;
  }

  .theme-dropdown {
    padding: 5px 8px;
    font-size: 0.75rem;
  }

  .header-subtext {
    display: none;
  }

  .hero-title { font-size: 1.8rem; }
  .hero-description { font-size: 0.95rem; }
  .modules-grid { grid-template-columns: 1fr; }
  .syllabus-section { padding: 1.25rem; }
  .foot { flex-direction: column; text-align: center; }
}

.back-to-top-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 9999; /* Higher z-index to stay above sidebars and headers */
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background-color: var(--primary);
  color: #ffffff;
  border: 1px solid var(--border-light);
  font-size: 1.2rem;
  font-weight: bold;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.2s ease, background-color 0.2s ease;
}

.back-to-top-btn.show {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.back-to-top-btn:hover {
  background-color: var(--accent-cyan);
  color: #000000;
  transform: translateY(-3px);
}

/*---------------------------COURSE ------------------------------------------*/

/* --------------------------------------------------------------------------
   9. Workspace & Sidebar Layout Styles
   -------------------------------------------------------------------------- */
.sidebar-controls-bar {
  background-color: var(--bg-header);
  border-bottom: 1px solid var(--border-color);
  padding: 6px 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 3.5rem;
  z-index: 90;
}

.toggle-btn {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  color: var(--accent-cyan);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.toggle-btn:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--primary);
  color: #fff;
}

.toggle-btn.inactive {
  color: var(--text-muted);
  border-color: var(--border-color);
  background-color: rgba(30, 41, 59, 0.4);
}

.app-container {
  display: grid;
  grid-template-columns: 320px 1fr 300px;
  min-height: calc(100vh - 98px);
  transition: grid-template-columns 0.3s ease;
}

.app-container.hide-left { grid-template-columns: 0px 1fr 300px; }
.app-container.hide-right { grid-template-columns: 320px 1fr 0px; }
.app-container.hide-left.hide-right { grid-template-columns: 0px 1fr 0px; }

.sidebar-left {
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  overflow-y: auto;
  transition: opacity 0.2s ease;
}

.app-container.hide-left .sidebar-left {
  opacity: 0;
  pointer-events: none;
  padding: 0;
  overflow: hidden;
}

.section-header {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.accordion-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.accordion-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.accordion-item:hover, .accordion-item.active { border-color: var(--border-light); }

.accordion-header {
  padding: 0.75rem 0.9rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
  background-color: var(--bg-card);
  transition: background-color 0.2s ease;
}

.accordion-header:hover { background-color: var(--bg-card-hover); }

.accordion-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 6px;
}

.tag-hrs {
  background-color: var(--bg-dark);
  color: var(--accent-cyan);
  font-size: 0.75rem;
  padding: 2px 7px;
  border-radius: 4px;
  font-family: var(--font-code);
  font-weight: 500;
}

.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  background-color: var(--bg-dark);
}

.accordion-item.active .accordion-body {
  max-height: 1000px;
  transition: max-height 0.3s ease-in-out;
}

.sub-session-list {
  list-style: none;
  padding: 0.5rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sub-session-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.8rem;
  padding: 5px 8px;
  border-radius: 4px;
  display: block;
  transition: all 0.2s ease;
}

.sub-session-link:hover, .sub-session-link.current {
  background-color: var(--bg-card);
  color: var(--primary);
}

.sidebar-left .sub-session-link.current {
  background-color: var(--accent-cyan-glow, rgba(6, 182, 212, 0.15)) !important;
  color: var(--accent-cyan, #06b6d4) !important;
  font-weight: 600;
  border-left: 3px solid var(--accent-cyan, #06b6d4);
}


.sub-session-link::before {
  content: '• ';
  color: var(--accent-cyan);
  margin-right: 4px;
}

.learning-tips-card {
  background-color: var(--bg-card);
  border: 1px dashed var(--border-light);
  border-radius: 8px;
  padding: 1rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.learning-tips-card h4 {
  color: var(--text-main);
  font-size: 0.88rem;
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.learning-tips-card ul { padding-left: 1rem; }
.learning-tips-card li { margin-bottom: 0.4rem; }

.main-workspace {
  padding: 2rem;
  overflow-y: auto;
  background-color: var(--bg-dark);
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

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

.session-title-box {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.session-title-box h1 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.session-meta-tags { display: flex; gap: 8px; flex-wrap: wrap; }

.meta-tag {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--accent-cyan);
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: 4px;
  font-family: var(--font-code);
}

.lesson-content {
  line-height: 1.8;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.lesson-content h2 {
  font-size: 1.35rem;
  color: var(--text-main);
  margin: 2rem 0 1rem 0;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.4rem;
}

.lesson-content h3 {
  font-size: 1.1rem;
  color: var(--accent-cyan);
  margin: 1.4rem 0 0.6rem 0;
}

.lesson-content p { margin-bottom: 1rem; }
.lesson-content ul, .lesson-content ol { margin: 0 0 1.25rem 1.5rem; }
.lesson-content li { margin-bottom: 0.5rem; }

.lesson-content code {
  background-color: var(--bg-card);
  color: var(--accent-cyan);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-code);
  font-size: 0.88rem;
}

.explanation-code-block {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 1rem;
  margin: 1rem 0 1.25rem 0;
  font-family: var(--font-code);
  font-size: 0.86rem;
  color: var(--accent-cyan);
  overflow-x: auto;
  white-space: pre;
  line-height: 1.5;
}

.info-callout {
  background-color: rgba(6, 182, 212, 0.08);
  border-left: 4px solid var(--accent-cyan);
  padding: 1rem 1.25rem;
  border-radius: 0 8px 8px 0;
  margin: 1.25rem 0;
  font-size: 0.9rem;
}

.code-runner-card {
  background-color: var(--bg-header);
  border: 1px solid var(--border-light);
  border-radius: 10px;
  margin: 2rem 0;
  overflow: hidden;
}

.code-runner-header {
  background-color: var(--bg-card);
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.code-runner-header span {
  font-size: 0.85rem;
  font-weight: 700;
  font-family: var(--font-code);
  color: var(--accent-cyan);
}

.runner-actions { display: flex; gap: 8px; }

.btn-action {
  background-color: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-light);
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-action:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--primary);
}

.btn-run {
  background-color: var(--accent-green);
  color: #000;
  border: none;
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: opacity 0.2s;
}

.btn-run:hover { opacity: 0.9; }

.code-editor {
  width: 100%;
  height: 280px;
  background-color: var(--bg-dark);
  color: var(--accent-cyan);
  border: none;
  padding: 1rem;
  font-family: var(--font-code);
  font-size: 0.88rem;
  resize: vertical;
  outline: none;
  line-height: 1.5;
}

.code-output-container {
  background-color: var(--bg-footer-bottom);
  border-top: 1px solid var(--border-color);
  padding: 0.85rem 1rem;
  font-family: var(--font-code);
  font-size: 0.82rem;
}

.code-output-title {
  color: var(--text-dim);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}

#console-output {
  color: var(--accent-green);
  white-space: pre-wrap;
  min-height: 24px;
}

.challenges-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
  margin: 1.5rem 0;
}

.challenge-item {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px dashed var(--border-color);
}

.challenge-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.challenge-title {
  font-weight: 700;
  color: var(--accent-cyan);
  font-size: 0.9rem;
  margin-bottom: 0.3rem;
}

.quiz-card {
  background-color: var(--bg-header);
  border: 1px solid var(--border-light);
  border-radius: 10px;
  padding: 1.25rem;
  margin: 2rem 0;
}

.quiz-question { margin-bottom: 1.25rem; }

.quiz-q-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.6rem;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.quiz-option-label {
  background-color: var(--bg-dark);
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
}

.quiz-option-label:hover {
  border-color: var(--border-light);
  background-color: var(--bg-card);
}

.quiz-result {
  margin-top: 1rem;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 8px 12px;
  border-radius: 6px;
  display: none;
}

.in-content-ad {
  margin: 2rem 0;
  background-color: var(--bg-card);
  border: 1px dashed var(--border-light);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
}

.ad-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
  display: block;
}

.completion-bar {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.btn-complete {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  color: var(--text-main);
  padding: 0.6rem 1.2rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
}

.btn-complete.active {
  background-color: rgba(16, 185, 129, 0.2);
  border-color: var(--accent-green);
  color: var(--accent-green);
}

.nav-buttons { display: flex; gap: 10px; }

.btn-nav {
  background-color: var(--primary);
  color: #fff;
  text-decoration: none;
  padding: 0.6rem 1rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
}

.sidebar-right {
  background-color: var(--bg-sidebar);
  border-left: 1px solid var(--border-color);
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  overflow-y: auto;
  transition: opacity 0.2s ease;
}

.app-container.hide-right .sidebar-right {
  opacity: 0;
  pointer-events: none;
  padding: 0;
  overflow: hidden;
}

.right-panel-box {
  background-color: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
}

.right-panel-header {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Dynamic Code Snippet Buttons */
.shortcut-list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.btn-shortcut {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.6rem 0.78rem;
  background-color: var(--bg-dark);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-family: 'Fira Code', monospace;
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

/*
.btn-shortcut {
  color: var(--text-muted);
  font-size: 0.78rem;
  font-family: var(--font-code);
  text-align: left;
  cursor: pointer;
}
*/

/* Action Labels inside the button (+ Load / ✕ Reset) */
.btn-shortcut span:last-child {
  color: var(--accent-cyan, #06b6d4);
  font-weight: 500;
  font-size: 0.78rem;
}

/* Hover State */
.btn-shortcut:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--accent-cyan, #06b6d4);
  color: var(--text-main);
  transform: translateY(-1px);
}

/* Clear/Reset Button Styling */
.btn-shortcut:last-child span:last-child {
  color: var(--accent-red, #ef4444);
}

.btn-shortcut:last-child:hover {
  border-color: var(--accent-red, #ef4444);
}
.live-monitor-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  padding: 0.4rem 0;
  color: var(--text-muted);
}

.live-monitor-row span.val {
  font-family: var(--font-code);
  color: var(--accent-cyan);
  font-weight: 600;
}

.sidebar-ad-slot {
  min-height: 250px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.8rem;
}

@media (max-width: 1024px) {
  .app-container { grid-template-columns: 280px 1fr 0px; }
  .app-container.hide-left { grid-template-columns: 0px 1fr 0px; }
  .app-container.show-right-override { grid-template-columns: 0px 1fr 280px !important; }
}

@media (max-width: 768px) {
  .app-container { grid-template-columns: 0px 1fr 0px; }
  .app-container.show-left-mobile { grid-template-columns: 280px 1fr 0px !important; }
  .app-container.show-right-mobile { grid-template-columns: 0px 1fr 280px !important; }
  .header-subtext { display: none; }
  .main-workspace { padding: 1.25rem 1rem; }
}


/* Dark Theme Default */
:root,
[data-theme="dark"],
[data-theme="theme-dark"] {
  --bg-dark: #090d16;
  --bg-header: #0f172a;
  --bg-sidebar: #0f172a; /* Matched to dark header */
  --bg-card: #1e293b;
  --bg-card-hover: #2d3748;
  --bg-footer-bottom: #070a10;
  --border-color: #1e293b;
  --border-light: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
}

/* Light Theme Overrides */
[data-theme="light"],
[data-theme="theme-light"] {
  --bg-dark: #f8fafc;
  --bg-header: #ffffff;
  --bg-sidebar: #ffffff; /* Matched to light header */
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-footer-bottom: #f1f5f9;
  --border-color: #e2e8f0;
  --border-light: #cbd5e1;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;
}

/* Emerald Theme */
[data-theme="emerald"] {
  --bg-dark: #064e3b;
  --bg-header: #022c22;
  --bg-sidebar: #022c22; /* Matched to emerald header */
  --bg-card: #047857;
  --bg-card-hover: #065f46;
  --bg-footer-bottom: #022c22;
  --border-color: #065f46;
  --border-light: #047857;
  --text-main: #ecfdf5;
  --text-muted: #a7f3d0;
  --text-dim: #6ee7b7;
}

/* Cyberpunk Theme */
[data-theme="cyberpunk"],
[data-theme="theme-cyberpunk"] {
  --bg-dark: #120e24;
  --bg-header: #0f001e;
  --bg-sidebar: #0f001e; /* Matched to cyberpunk header */
  --bg-card: #1d173b;
  --bg-card-hover: #2a004f;
  --bg-footer-bottom: #090614;
  --border-color: #ff007f;
  --border-light: #ff3399;
  --text-main: #00f0ff;
  --text-muted: #ff007f;
  --text-dim: #b50060;
}

/* Sunset Theme */
[data-theme="sunset"] {
  --bg-dark: #2d1216;
  --bg-header: #1c0a0c;
  --bg-sidebar: #1c0a0c; /* Matched to sunset header */
  --bg-card: #421a20;
  --bg-card-hover: #542229;
  --bg-footer-bottom: #1c0a0c;
  --border-color: #542229;
  --border-light: #7c2d37;
  --text-main: #fff7ed;
  --text-muted: #fdba74;
  --text-dim: #fb923c;
}


/* Sidebar Background Alignment */
.sidebar-left,
.sidebar-right {
  background-color: var(--bg-sidebar);
  border-color: var(--border-color);
  transition: background-color 0.2s ease, opacity 0.2s ease;
}

/* Inner Panels & Accordion Items Alignment */
.right-panel-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
}

.accordion-body {
  background-color: var(--bg-dark);
}

.tag-hrs {
  background-color: var(--bg-dark);
  color: var(--accent-cyan);
}