/* ═══════════════════════════════════════════════════════════════════════
   Code Tutorium — GeeksforGeeks-Inspired Lessons Styles
   Green theme, clean sidebar, dark code blocks
   ═══════════════════════════════════════════════════════════════════════ */

:root {
  /* GFG-inspired green palette */
  --gfg-green: #308D46;
  --gfg-green-dark: #1d5c2d;
  --gfg-green-light: #e8f5e9;
  --gfg-green-hover: #4caf50;
  
  /* Background colors */
  --bg: #ffffff;
  --bg-secondary: #f9f9f9;
  --surface: #f5f5f5;
  --surface-hover: #eeeeee;
  --sidebar-bg: #ffffff;
  
  /* Border colors */
  --border: #e0e0e0;
  --border-light: #f0f0f0;
  --border-dark: #bdbdbd;
  
  /* Text colors */
  --text: #212121;
  --text-secondary: #424242;
  --text-muted: #757575;
  --text-light: #9e9e9e;
  
  /* Code blocks - dark theme */
  --code-bg: #1e1e1e;
  --code-bg-light: #2d2d2d;
  --code-text: #d4d4d4;
  --code-border: #333333;
  
  /* Syntax highlighting colors */
  --syntax-keyword: #569cd6;
  --syntax-string: #ce9178;
  --syntax-comment: #6a9955;
  --syntax-function: #dcdcaa;
  --syntax-number: #b5cea8;
  --syntax-tag: #569cd6;
  --syntax-attr: #9cdcfe;
  
  /* Status colors */
  --success: #4caf50;
  --warning: #ff9800;
  --error: #f44336;
  --info: #2196f3;
}

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

html { 
  scroll-behavior: smooth; 
}

body {
  font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ═══════════════════════════════════════════════════════════════════════
   MENU BUTTON - Always visible (sidebar always hidden)
   ═══════════════════════════════════════════════════════════════════════ */
#menu-toggle,
.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 200;
  background: var(--gfg-green);
  color: white;
  border: none;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(48, 141, 70, 0.3);
  transition: all 0.2s ease;
}

#menu-toggle:hover,
.mobile-menu-btn:hover {
  background: var(--gfg-green-dark);
  transform: translateY(-1px);
}

/* ═══════════════════════════════════════════════════════════════════════
   SIDEBAR - Hidden by default (ad space ready)
   ═══════════════════════════════════════════════════════════════════════ */
#sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 320px;
  height: 100vh;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  z-index: 100;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
  transform: translateX(-100%);  /* Hidden by default on ALL screens */
}

#sidebar.open {
  transform: translateX(0);
  box-shadow: 4px 0 20px rgba(0, 0, 0, 0.15);
}

#sidebar::-webkit-scrollbar {
  width: 6px;
}

#sidebar::-webkit-scrollbar-track {
  background: transparent;
}

#sidebar::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

#sidebar::-webkit-scrollbar-thumb:hover {
  background: var(--border-dark);
}

/* Sidebar Header with Logo */
.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-light);
  background: var(--bg);
}

.sidebar-header .logo,
.sidebar-header a.logo {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  margin-bottom: 8px;
}

.sidebar-header .logo-icon,
.sidebar-header .logo span:first-child {
  background: var(--gfg-green);
  color: white;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-size: 1rem;
  font-weight: 700;
}

.sidebar-header p {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin: 0;
  padding-left: 48px;
}

/* Navigation Sections */
.nav-section {
  margin: 8px 0;
}

.nav-section-label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px 8px;
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* Navigation Items */
.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  margin: 2px 12px;
  color: var(--text-secondary);
  background: none;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 400;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: left;
  width: calc(100% - 24px);
}

.nav-item:hover {
  background: var(--surface);
  color: var(--gfg-green);
}

.nav-item.active {
  background: var(--gfg-green-light);
  color: var(--gfg-green);
  font-weight: 500;
}

.nav-item .num {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-light);
  min-width: 24px;
}

.nav-item.active .num {
  color: var(--gfg-green);
  font-weight: 600;
}

.nav-item .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--border-dark);
  margin-left: auto;
}

.nav-item.active .dot {
  background: var(--gfg-green);
}

/* ═══════════════════════════════════════════════════════════════════════
   MAIN CONTENT AREA - Centered (full width for ads)
   ═══════════════════════════════════════════════════════════════════════ */
#main {
  margin-left: 0;
  min-height: 100vh;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Top Bar with Breadcrumb and Progress */
#topbar {
  position: sticky;
  top: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border-light);
  padding: 16px 20px;
  padding-left: 70px;  /* Space for menu button */
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  z-index: 50;
  width: 100%;
  max-width: 1200px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.breadcrumb span:first-child {
  color: var(--gfg-green);
  font-weight: 500;
}

.breadcrumb .sep {
  color: var(--text-light);
}

.breadcrumb .current {
  color: var(--text);
  font-weight: 500;
}

/* Progress Bar - Hidden (for ad space layout) */
.progress-bar-wrap {
  display: none;  /* Hidden - remove this line to show progress again */
}

.progress-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
  display: none;  /* Hidden */
  white-space: nowrap;
}

.progress-track {
  width: 120px;
  height: 6px;
  background: var(--surface);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--gfg-green), var(--gfg-green-hover));
  border-radius: 3px;
  transition: width 0.3s ease;
}

/* ═══════════════════════════════════════════════════════════════════════
   LECTURE CONTENT
   ═══════════════════════════════════════════════════════════════════════ */
.lecture {
  display: none;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 32px;
  animation: fadeIn 0.3s ease;
}

.lecture.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Lecture Header */
.lecture-tag {
  display: inline-block;
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  color: var(--gfg-green);
  background: var(--gfg-green-light);
  padding: 6px 12px;
  border-radius: 20px;
  margin-bottom: 16px;
  font-weight: 500;
}

.lecture h1 {
  font-family: 'Syne', sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--text);
  margin-bottom: 20px;
}

.lecture-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
}

.meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
  background: var(--surface);
  padding: 6px 12px;
  border-radius: 6px;
}

.meta-badge.level-beginner {
  background: rgba(76, 175, 80, 0.1);
  color: var(--gfg-green);
}

/* ═══════════════════════════════════════════════════════════════════════
   TYPOGRAPHY
   ═══════════════════════════════════════════════════════════════════════ */
.lecture h2 {
  font-family: 'Syne', sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  margin: 40px 0 16px;
  color: var(--text);
  line-height: 1.4;
}

.lecture h3 {
  font-family: 'Syne', sans-serif;
  font-size: 1.3rem;
  font-weight: 600;
  margin: 32px 0 14px;
  color: var(--text-secondary);
}

.lecture h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 24px 0 12px;
  color: var(--text-secondary);
}

.lecture p {
  margin-bottom: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 1rem;
}

.lecture ul,
.lecture ol {
  margin: 16px 0 24px 24px;
  color: var(--text-secondary);
}

.lecture li {
  margin-bottom: 10px;
  line-height: 1.7;
}

.lecture strong {
  color: var(--text);
  font-weight: 600;
}

.lecture a {
  color: var(--gfg-green);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.lecture a:hover {
  border-bottom-color: var(--gfg-green);
}

/* ═══════════════════════════════════════════════════════════════════════
   CODE BLOCKS - Dark Theme like GFG
   ═══════════════════════════════════════════════════════════════════════ */
.code-block {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 12px;
  margin: 24px 0;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--code-bg-light);
  border-bottom: 1px solid var(--code-border);
}

.code-dots {
  display: flex;
  gap: 6px;
}

.code-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.code-dots span:nth-child(1) { background: #ff5f56; }
.code-dots span:nth-child(2) { background: #ffbd2e; }
.code-dots span:nth-child(3) { background: #27ca40; }

.filename {
  font-family: 'DM Mono', monospace;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.code-block pre {
  padding: 20px;
  overflow-x: auto;
  font-family: 'DM Mono', 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  background: var(--code-bg);
  color: var(--code-text);
}

.code-block code {
  font-family: 'DM Mono', 'JetBrains Mono', 'Fira Code', monospace;
  color: var(--code-text);
}

/* Syntax Highlighting Classes */
.code-block .kw { color: var(--syntax-keyword); font-weight: 600; } /* Keywords */
.code-block .st { color: var(--syntax-string); } /* Strings */
.code-block .cm { color: var(--syntax-comment); font-style: italic; } /* Comments */
.code-block .fn { color: var(--syntax-function); } /* Functions */
.code-block .bi { color: var(--syntax-function); } /* Built-ins */
.code-block .num { color: var(--syntax-number); } /* Numbers */
.code-block .tag { color: var(--syntax-tag); } /* HTML/XML tags */
.code-block .attr { color: var(--syntax-attr); } /* Attributes */

/* Inline Code */
.lecture code {
  font-family: 'DM Mono', 'JetBrains Mono', monospace;
  background: var(--surface);
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--gfg-green);
  border: 1px solid var(--border);
}

/* Output Block */
.output-block {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin: 16px 0;
  overflow: hidden;
}

.output-header {
  padding: 10px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  font-family: 'DM Mono', monospace;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.output-block pre {
  padding: 16px;
  font-family: 'DM Mono', monospace;
  font-size: 0.9rem;
  color: var(--text-secondary);
  background: var(--bg);
}

/* ═══════════════════════════════════════════════════════════════════════
   INFO BOXES
   ═══════════════════════════════════════════════════════════════════════ */
.box {
  border-radius: 12px;
  padding: 20px 24px;
  margin: 24px 0;
  border-left: 4px solid;
}

.box.info {
  background: #e3f2fd;
  border-left-color: var(--info);
}

.box.tip {
  background: #e8f5e9;
  border-left-color: var(--gfg-green);
}

.box.warning {
  background: #fff3e0;
  border-left-color: var(--warning);
}

.box-title {
  font-weight: 600;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.box.info .box-title { color: var(--info); }
.box.tip .box-title { color: var(--gfg-green); }
.box.warning .box-title { color: var(--warning); }

.box p {
  margin: 0;
  color: var(--text-secondary);
}

/* ═══════════════════════════════════════════════════════════════════════
   EXERCISE BOX
   ═══════════════════════════════════════════════════════════════════════ */
.exercise {
  background: linear-gradient(135deg, var(--gfg-green-light) 0%, #f5f5f5 100%);
  border: 2px solid var(--gfg-green);
  border-radius: 16px;
  padding: 28px;
  margin: 32px 0;
}

.exercise-title {
  font-family: 'Syne', sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--gfg-green);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.exercise p {
  margin-bottom: 12px;
}

/* ═══════════════════════════════════════════════════════════════════════
   LECTURE NAVIGATION
   ═══════════════════════════════════════════════════════════════════════ */
.lecture-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 2px solid var(--border-light);
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-btn:hover {
  background: var(--gfg-green-light);
  border-color: var(--gfg-green);
  color: var(--gfg-green);
}

.nav-btn.primary {
  background: var(--gfg-green);
  color: white;
  border-color: var(--gfg-green);
}

.nav-btn.primary:hover {
  background: var(--gfg-green-dark);
  border-color: var(--gfg-green-dark);
}

/* ═══════════════════════════════════════════════════════════════════════
   PLAYGROUND (Interactive Code Editor)
   ═══════════════════════════════════════════════════════════════════════ */
.playground {
  border: 1px solid var(--border);
  border-radius: 12px;
  margin: 24px 0;
  overflow: hidden;
  background: var(--bg);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.playground-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.playground-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
}

.playground-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.run-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.run-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gfg-green);
}

.run-btn,
.reset-btn {
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.run-btn {
  background: var(--gfg-green);
  color: white;
  border: none;
}

.run-btn:hover {
  background: var(--gfg-green-dark);
}

.reset-btn {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.reset-btn:hover {
  background: var(--border-light);
}

.playground-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 300px;
}

.editor-pane,
.preview-pane {
  position: relative;
}

.editor-pane {
  border-right: 1px solid var(--border);
}

.pane-label {
  position: absolute;
  top: 8px;
  left: 12px;
  font-size: 0.7rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  z-index: 10;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.dot-orange { background: #ff9800; }
.dot-green { background: #4caf50; }

.code-editor {
  width: 100%;
  height: 100%;
  min-height: 300px;
  padding: 40px 16px 16px;
  border: none;
  background: var(--code-bg);
  color: var(--code-text);
  font-family: 'DM Mono', 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  resize: vertical;
  outline: none;
}

.preview-iframe-wrap {
  height: 100%;
  min-height: 300px;
}

.preview-iframe-wrap iframe {
  width: 100%;
  height: 100%;
  border: none;
  background: white;
}

.playground-hint {
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.kbd {
  display: inline-block;
  padding: 2px 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
}

/* Tag Diagram (for HTML lessons) */
.tag-diagram {
  background: var(--code-bg);
  border-radius: 12px;
  padding: 24px;
  margin: 20px 0;
}

.tag-example {
  font-family: 'DM Mono', monospace;
  font-size: 1.1rem;
  margin-bottom: 20px;
  padding: 16px;
  background: var(--code-bg-light);
  border-radius: 8px;
}

.annotations {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.ann {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.ann-value {
  padding: 4px 12px;
  border-radius: 4px;
  font-family: 'DM Mono', monospace;
  font-size: 0.8rem;
}

.ann-tag { background: rgba(249, 115, 22, 0.2); color: #f97316; }
.ann-attr { background: rgba(255, 203, 107, 0.2); color: #ffcb6b; }
.ann-val { background: rgba(195, 232, 141, 0.2); color: #c3e88d; }
.ann-content { background: rgba(56, 189, 248, 0.2); color: #38bdf8; }

.ann-label {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* ═══════════════════════════════════════════════════════════════════════
   RESPONSIVE DESIGN
   ═══════════════════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  #topbar {
    padding: 16px 20px;
    padding-left: 70px;
  }
  
  .lecture {
    padding: 24px 20px;
  }
}

@media (max-width: 768px) {
  .playground-body {
    grid-template-columns: 1fr;
  }
  
  .editor-pane {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  
  .lecture h1 {
    font-size: 1.5rem;
  }
  
  .lecture h2 {
    font-size: 1.3rem;
  }
  
  .lecture h3 {
    font-size: 1.1rem;
  }
  
  .code-block pre {
    padding: 16px;
    font-size: 0.85rem;
  }
  
  .exercise {
    padding: 20px;
  }
  
  .lecture-nav {
    flex-direction: column;
  }
  
  #topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  
}

@media (max-width: 480px) {
  #menu-toggle,
  .mobile-menu-btn {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
  
  #topbar {
    padding-left: 60px;
  }
  
  .lecture {
    padding: 20px 16px;
  }
  
  .lecture-meta {
    gap: 8px;
  }
  
  .meta-badge {
    font-size: 0.75rem;
    padding: 4px 8px;
  }
  
  .nav-item {
    padding: 8px 12px;
    font-size: 0.85rem;
  }
  
  .box {
    padding: 16px;
  }
}


/* ═══════════════════════════════════════════════════════════════════════
   BACK TO TOP BUTTON
   ═══════════════════════════════════════════════════════════════════════ */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(30, 58, 95, 0.3);
  z-index: 150;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(30, 58, 95, 0.4);
}

@media (max-width: 768px) {
  .back-to-top {
    width: 44px;
    height: 44px;
    bottom: 1rem;
    right: 1rem;
    font-size: 1rem;
  }
}

/* ═══════════════════════════════════════════════════════════════════════
   LESSON MEGA NAVIGATION
   ═══════════════════════════════════════════════════════════════════════ */
.lesson-mega-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 250;
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  height: 60px;
}

.lesson-nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 100%;
  max-width: 1400px;
  margin: 0 auto;
}

.lesson-nav-logo {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: -0.03em;
  color: var(--text);
  text-decoration: none;
}
.lesson-nav-logo span { color: var(--gfg-green); }

.lesson-mega-menu {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lesson-mega-item {
  position: relative;
}

.lesson-mega-trigger {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: 'Outfit', sans-serif;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.5rem 0.8rem;
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.2s;
}
.lesson-mega-trigger:hover {
  background: rgba(30, 58, 95, 0.05);
  color: var(--text);
}
.lesson-mega-trigger svg {
  transition: transform 0.2s;
}
.lesson-mega-item:hover .lesson-mega-trigger svg {
  transform: rotate(180deg);
}

.lesson-mega-link-plain {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.5rem 0.8rem;
  border-radius: 6px;
  transition: all 0.2s;
}
.lesson-mega-link-plain:hover {
  background: rgba(30, 58, 95, 0.05);
  color: var(--text);
}

/* Search Button */
.lesson-nav-search {
  margin-left: 0.5rem;
}
.lesson-nav-search .search-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}
.lesson-nav-search .search-btn:hover {
  background: rgba(30, 58, 95, 0.05);
  color: var(--text);
}

/* Dropdown */
.lesson-mega-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.15);
  padding: 1rem;
  min-width: 400px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: all 0.2s ease;
  z-index: 300;
}
.lesson-mega-item:hover .lesson-mega-dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.lesson-mega-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
}

.lesson-mega-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 8px;
  transition: all 0.15s;
}
.lesson-mega-link:hover {
  background: rgba(30, 58, 95, 0.05);
  color: var(--gfg-green);
}
.lesson-mega-link.active {
  background: rgba(30, 58, 95, 0.08);
  color: var(--gfg-green);
  font-weight: 600;
}

.lesson-mega-icon {
  font-size: 1.5rem;
  line-height: 1;
}

/* Adjust menu button position for mega nav */
#menu-toggle {
  top: 75px;
}

/* Mobile responsive */
@media (max-width: 768px) {
  .lesson-mega-nav {
    height: 50px;
  }
  .lesson-nav-logo {
    font-size: 1.1rem;
  }
  .lesson-mega-menu {
    display: none;
  }
  #menu-toggle {
    top: 65px;
  }
}