/* C++ Modern Course Portal & Documentation Stylesheet */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-card: #151f32;
  --bg-card-hover: #1c2a44;
  --bg-elevated: #1e293b;
  --border-subtle: #24344d;
  --border-highlight: #3b82f6;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-blue: #38bdf8;
  --accent-green: #22c55e;
  --accent-amber: #f59e0b;
  --accent-purple: #a855f7;
  --accent-pink: #ec4899;
  --accent-red: #ef4444;

  /* State colors */
  --status-todo-bg: #1e293b;
  --status-todo-border: #334155;
  --status-todo-text: #94a3b8;

  --status-progress-bg: #451a03;
  --status-progress-border: #d97706;
  --status-progress-text: #fbbf24;

  --status-done-bg: #064e3b;
  --status-done-border: #059669;
  --status-done-text: #34d399;

  --code-bg: #0b1120;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(56, 189, 248, 0.15);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Glassmorphism utility */
.glass-panel {
  background: rgba(21, 31, 50, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
}

/* Top Navbar */
header.app-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(9, 13, 22, 0.9);
  backdrop-filter: blur(16px);
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}

.brand-badge {
  background: linear-gradient(135deg, #0284c7, #6366f1);
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.1rem;
  padding: 6px 12px;
  border-radius: var(--radius-md);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
}

.brand-titles h1 {
  font-size: 1.15rem;
  font-weight: 700;
  background: linear-gradient(90deg, #f8fafc, #93c5fd);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.brand-titles p {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Nav center search */
.search-wrapper {
  flex: 1;
  max-width: 480px;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 8px 36px 8px 38px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-size: 0.85rem;
  outline: none;
  transition: all 0.2s ease;
}

.search-input:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.9rem;
  pointer-events: none;
}

.search-shortcut {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: #334155;
  color: #94a3b8;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  padding: 2px 6px;
  border-radius: 4px;
}

/* Nav Actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.lang-selector {
  display: flex;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 4px 8px;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}

.lang-btn.active {
  background: var(--accent-blue);
  color: #0f172a;
}

.lang-btn:hover:not(.active) {
  color: #fff;
}

.view-toggle-group {
  display: flex;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.view-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 5px 12px;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}

.view-btn.active {
  background: #2563eb;
  color: #fff;
}

.btn-secondary {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 6px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}

.btn-secondary:hover {
  background: #334155;
  border-color: var(--text-secondary);
}

/* Sub-header Progress Tracker */
.progress-strip {
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.8) 0%, rgba(9, 13, 22, 0.4) 100%);
  border-bottom: 1px solid var(--border-subtle);
  padding: 12px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.progress-info {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 1;
  min-width: 280px;
}

.progress-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}

.progress-bar-container {
  flex: 1;
  height: 10px;
  background: #1e293b;
  border-radius: 5px;
  overflow: hidden;
  position: relative;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #38bdf8, #22c55e);
  transition: width 0.4s ease;
  box-shadow: 0 0 10px rgba(34, 197, 94, 0.4);
}

.progress-percentage {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent-green);
  min-width: 45px;
}

.progress-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.stat-pill {
  background: var(--bg-card);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 6px;
}

.stat-pill .indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

/* App Main Container */
main.app-body {
  flex: 1;
  display: flex;
  width: 100%;
  max-width: 1600px;
  margin: 0 auto;
}

/* Mode 1: Doc View Layout */
.doc-layout {
  display: flex;
  width: 100%;
  height: calc(100vh - 120px);
  overflow: hidden;
}

.doc-sidebar {
  width: 320px;
  flex-shrink: 0;
  border-right: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  overflow-y: auto;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.doc-sidebar::-webkit-scrollbar,
.doc-content-wrapper::-webkit-scrollbar {
  width: 6px;
}

.doc-sidebar::-webkit-scrollbar-thumb,
.doc-content-wrapper::-webkit-scrollbar-thumb {
  background: #334155;
  border-radius: 3px;
}

.sidebar-module {
  margin-bottom: 8px;
}

.sidebar-module-header {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-blue);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  background: rgba(30, 41, 59, 0.4);
}

.sidebar-module-header:hover {
  background: rgba(30, 41, 59, 0.8);
}

.sidebar-lessons {
  list-style: none;
  margin-top: 4px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-lesson-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 7px 10px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
}

.sidebar-lesson-item:hover {
  background: var(--bg-card-hover);
  color: #fff;
}

.sidebar-lesson-item.active {
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-blue);
  font-weight: 600;
  border-left: 3px solid var(--accent-blue);
}

.lesson-status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}

.status-dot-0 { background: #64748b; }
.status-dot-1 { background: #f59e0b; box-shadow: 0 0 6px #f59e0b; }
.status-dot-2 { background: #22c55e; box-shadow: 0 0 6px #22c55e; }

/* Doc Content Area */
.doc-content-wrapper {
  flex: 1;
  overflow-y: auto;
  padding: 32px 48px;
  background: var(--bg-primary);
}

.doc-article {
  max-width: 900px;
  margin: 0 auto;
}

.doc-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.doc-breadcrumbs span.current {
  color: var(--accent-blue);
  font-weight: 500;
}

.doc-header {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.doc-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.doc-title-row h2 {
  font-size: 1.85rem;
  font-weight: 800;
  color: #f8fafc;
  line-height: 1.25;
}

.lesson-action-pills {
  display: flex;
  align-items: center;
  gap: 10px;
}

.status-toggle-btn {
  border: 1px solid transparent;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}

.status-toggle-btn[data-state="0"] {
  background: var(--status-todo-bg);
  border-color: var(--status-todo-border);
  color: var(--status-todo-text);
}

.status-toggle-btn[data-state="1"] {
  background: var(--status-progress-bg);
  border-color: var(--status-progress-border);
  color: var(--status-progress-text);
}

.status-toggle-btn[data-state="2"] {
  background: var(--status-done-bg);
  border-color: var(--status-done-border);
  color: var(--status-done-text);
}

.share-topic-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}

.share-topic-btn:hover {
  color: #fff;
  border-color: var(--accent-blue);
  background: var(--bg-card-hover);
}

/* Where to Learn Curated Resource Cards */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-bottom: 28px;
}

.resource-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.2s ease;
}

.resource-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-blue);
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.15);
}

.resource-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.resource-info .resource-badge {
  font-size: 0.68rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--accent-blue);
  display: block;
}

.resource-info .resource-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: #f8fafc;
}

/* Code Snippet Box */
.code-section {
  background: var(--code-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 28px;
  box-shadow: var(--shadow-card);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: #0f172a;
  border-bottom: 1px solid var(--border-subtle);
}

.code-lang-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  gap: 6px;
}

.code-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.code-btn {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all 0.2s;
}

.code-btn:hover {
  background: #334155;
  color: #fff;
}

.code-body pre {
  padding: 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: #e2e8f0;
  line-height: 1.5;
}

/* Simulated Console Output */
.console-output {
  border-top: 1px solid var(--border-subtle);
  background: #060911;
  padding: 12px 16px;
}

.console-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.console-body {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #4ade80;
  white-space: pre-wrap;
  word-break: break-all;
}

/* Key Takeaways Card */
.takeaways-card {
  background: var(--bg-card);
  border-left: 4px solid var(--accent-purple);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 32px;
}

.takeaways-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #c084fc;
  margin-bottom: 10px;
}

.takeaways-card ul {
  list-style: disc;
  margin-left: 20px;
  color: var(--text-secondary);
  font-size: 0.88rem;
}

.takeaways-card li {
  margin-bottom: 6px;
}

/* Pagination Bar */
.doc-pagination {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.pagination-btn {
  display: flex;
  flex-direction: column;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  text-decoration: none;
  color: inherit;
  transition: all 0.2s;
  min-width: 180px;
}

.pagination-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-blue);
  transform: translateY(-2px);
}

.pagination-btn .direction-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
}

.pagination-btn .target-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  margin-top: 4px;
}

/* Mode 2: Roadmap / Grid View */
.roadmap-container {
  width: 100%;
  padding: 24px;
  max-width: 1280px;
  margin: 0 auto;
}

.filters-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
}

.filter-chips {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-chip {
  padding: 5px 12px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  border: 1px solid var(--border-subtle);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.filter-chip.active {
  background: var(--accent-blue);
  color: #0f172a;
  border-color: var(--accent-blue);
}

.filter-chip:hover:not(.active) {
  color: #fff;
  border-color: var(--text-secondary);
}

.modules-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.module-section {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  padding: 20px 24px;
  box-shadow: var(--shadow-card);
}

.module-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
}

.module-header-row h3 {
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.module-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 18px;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 12px;
}

.skill-card {
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 2px solid var(--status-todo-border);
  background-color: var(--status-todo-bg);
  cursor: pointer;
  user-select: none;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.skill-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.skill-card[data-state="0"] {
  background-color: var(--status-todo-bg);
  border-color: var(--status-todo-border);
}

.skill-card[data-state="1"] {
  background-color: var(--status-progress-bg);
  border-color: var(--status-progress-border);
}

.skill-card[data-state="2"] {
  background-color: var(--status-done-bg);
  border-color: var(--status-done-border);
}

.skill-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.skill-number-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.skill-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

.skill-card[data-state="0"] .skill-badge { background: #334155; color: #cbd5e1; }
.skill-card[data-state="1"] .skill-badge { background: #f59e0b; color: #000; }
.skill-card[data-state="2"] .skill-badge { background: #22c55e; color: #000; }

.skill-card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff;
  line-height: 1.35;
}

.skill-card-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}

.skill-yt-time {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  gap: 4px;
}

.skill-open-doc-btn {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 4px;
  transition: all 0.15s;
}

.skill-card:hover .skill-open-doc-btn {
  background: #334155;
  color: #fff;
}

/* Cheatsheet Modal */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-backdrop.open {
  display: flex;
}

.modal-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 840px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
}

.modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.3rem;
  cursor: pointer;
}

.modal-close-btn:hover {
  color: #fff;
}

.modal-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.cheatsheet-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

.cheatsheet-table th,
.cheatsheet-table td {
  padding: 8px 12px;
  border: 1px solid var(--border-subtle);
  text-align: left;
}

.cheatsheet-table th {
  background: var(--bg-card);
  color: var(--accent-blue);
  font-family: var(--font-mono);
}

.cheatsheet-table tr:nth-child(even) {
  background: rgba(30, 41, 59, 0.3);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  background: #0f172a;
  border: 1px solid var(--accent-blue);
  color: #fff;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  transform: translateY(20px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  align-items: center;
  gap: 8px;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* Responsive adjustments */
/* Source Badge Colors */
.badge-source {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  letter-spacing: 0.02em;
}

.badge-brocode {
  background: rgba(239, 68, 68, 0.2);
  color: #fca5a5;
  border: 1px solid #ef4444;
}

.badge-learncpp {
  background: rgba(16, 185, 129, 0.2);
  color: #6ee7b7;
  border: 1px solid #10b981;
}

.badge-primer {
  background: rgba(139, 92, 246, 0.2);
  color: #c4b5fd;
  border: 1px solid #8b5cf6;
}

.badge-prodev {
  background: rgba(245, 158, 11, 0.2);
  color: #fcd34d;
  border: 1px solid #f59e0b;
}

/* Little Section: Lesson Quick Quiz */
.lesson-quiz-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-top: 30px;
  margin-bottom: 24px;
}

.quiz-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--accent-blue);
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 14px 0;
}

.quiz-opt-btn {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-align: left;
  font-size: 0.88rem;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 10px;
}

.quiz-opt-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-blue);
}

.quiz-opt-btn.selected {
  border-color: var(--accent-blue);
  background: rgba(56, 189, 248, 0.15);
}

.quiz-opt-btn.correct {
  border-color: var(--accent-green) !important;
  background: rgba(34, 197, 94, 0.2) !important;
  color: #4ade80 !important;
}

.quiz-opt-btn.incorrect {
  border-color: var(--accent-red) !important;
  background: rgba(239, 68, 68, 0.2) !important;
  color: #f87171 !important;
}

/* Revealed correct option when user picked wrong */
.quiz-opt-btn.correct-reveal {
  border-color: #22c55e !important;
  background: rgba(34, 197, 94, 0.15) !important;
  color: #86efac !important;
  box-shadow: 0 0 14px rgba(34, 197, 94, 0.3);
  position: relative;
}

.quiz-opt-btn.correct-reveal::after {
  content: "✅ Correct Answer";
  position: absolute;
  right: 12px;
  font-size: 0.72rem;
  background: rgba(34, 197, 94, 0.25);
  padding: 2px 8px;
  border-radius: 4px;
  color: #4ade80;
  font-weight: 700;
}

.quiz-opt-btn.disabled {
  opacity: 0.75;
  cursor: default;
}

.quiz-feedback {
  margin-top: 14px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  display: none;
  animation: fadeIn 0.2s ease-out;
}

.quiz-feedback.show {
  display: block;
}

.quiz-feedback.success {
  background: rgba(34, 197, 94, 0.12);
  border: 1px solid var(--accent-green);
  color: #86efac;
}

.quiz-feedback.error {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid var(--accent-red);
  color: #fca5a5;
}

.fb-comparison {
  margin: 10px 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: rgba(0, 0, 0, 0.25);
  padding: 10px 12px;
  border-radius: 6px;
}

.fb-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
}

.fb-badge {
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.fb-badge-wrong {
  background: rgba(239, 68, 68, 0.3);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.5);
}

.fb-badge-correct {
  background: rgba(34, 197, 94, 0.3);
  color: #4ade80;
  border: 1px solid rgba(34, 197, 94, 0.5);
}

.fb-explanation {
  margin-top: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 8px;
}

.btn-retry-lesson-quiz {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: #fff;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
}

.btn-retry-lesson-quiz:hover {
  background: var(--accent-blue);
  color: #0f172a;
  border-color: var(--accent-blue);
}

/* Custom Retest Banner */
.retest-banner {
  background: linear-gradient(90deg, rgba(245, 158, 11, 0.2), rgba(239, 68, 68, 0.15));
  border: 1px solid var(--accent-amber);
  border-radius: var(--radius-md);
  padding: 10px 16px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
  color: #fde047;
  font-weight: 600;
  animation: pulseGlow 3s infinite alternate;
}

@keyframes pulseGlow {
  0% { box-shadow: 0 0 5px rgba(245, 158, 11, 0.2); }
  100% { box-shadow: 0 0 15px rgba(245, 158, 11, 0.4); }
}

/* Retest Action Button */
.btn-retest-mistakes {
  background: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
  color: #ffffff !important;
  border: none !important;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.92rem;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.4);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.btn-retest-mistakes:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.6);
  filter: brightness(1.1);
}

/* Relearning & Review Section */
.relearn-section {
  margin-top: 20px;
  text-align: left;
}

.relearn-filter-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.relearn-filter-btn {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.relearn-filter-btn:hover {
  color: #fff;
  border-color: var(--text-secondary);
}

.relearn-filter-btn.active {
  background: var(--accent-blue);
  color: #0f172a;
  border-color: var(--accent-blue);
}

.relearn-filter-btn.active.filter-wrong {
  background: var(--accent-red);
  color: #fff;
  border-color: var(--accent-red);
}

.relearn-filter-btn.active.filter-correct {
  background: var(--accent-green);
  color: #0f172a;
  border-color: var(--accent-green);
}

.review-list {
  max-height: 420px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-right: 6px;
}

.review-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  border: 1px solid var(--border-subtle);
  transition: all 0.2s;
}

.review-card.wrong {
  border-left: 4px solid var(--accent-red);
  background: rgba(239, 68, 68, 0.04);
}

.review-card.correct {
  border-left: 4px solid var(--accent-green);
  background: rgba(34, 197, 94, 0.04);
}

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

.review-card-title {
  font-weight: 700;
  font-size: 0.95rem;
  color: #fff;
  line-height: 1.4;
  margin-bottom: 10px;
}

.review-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}

.review-badge.wrong {
  background: rgba(239, 68, 68, 0.2);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.4);
}

.review-badge.correct {
  background: rgba(34, 197, 94, 0.2);
  color: #4ade80;
  border: 1px solid rgba(34, 197, 94, 0.4);
}

.review-answer-row {
  font-size: 0.85rem;
  margin-bottom: 6px;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.review-answer-row.user-wrong {
  color: #f87171;
}

.review-answer-row.user-correct {
  color: #4ade80;
}

.review-answer-row.good-answer {
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.1);
  padding: 6px 10px;
  border-radius: 4px;
  border: 1px dashed rgba(56, 189, 248, 0.4);
}

.review-explanation {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-style: italic;
}

/* Flashcards View */
.flashcards-container {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 24px;
}

.flashcards-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.flashcards-size-toggle {
  display: flex;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 2px;
}

/* Flashcards: Small Grid */
.flashcards-grid-small {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.small-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 200px;
}

.small-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-blue);
  box-shadow: var(--shadow-card);
}

.small-card .card-category {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-purple);
  margin-bottom: 8px;
}

.small-card .card-question {
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff;
  line-height: 1.4;
}

.small-card .card-answer {
  display: none;
  font-size: 0.85rem;
  color: #94a3b8;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--border-subtle);
  line-height: 1.5;
}

.small-card.revealed .card-answer {
  display: block;
}

.small-card .reveal-btn {
  margin-top: 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--accent-blue);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  align-self: flex-start;
}

/* Flashcards: Large Focus Mode */
.flashcards-large-wrapper {
  max-width: 720px;
  margin: 20px auto;
  perspective: 1200px;
}

.flip-card-large {
  width: 100%;
  min-height: 380px;
  background: transparent;
  cursor: pointer;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: var(--radius-lg);
}

.flip-card-large.flipped {
  transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: var(--radius-lg);
  padding: 36px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
}

.flip-card-front {
  background: linear-gradient(145deg, #151f32 0%, #0f172a 100%);
}

.flip-card-back {
  background: linear-gradient(145deg, #0b1120 0%, #172554 100%);
  transform: rotateY(180deg);
  border-color: var(--accent-blue);
}

.large-card-content h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.5;
  margin-top: 16px;
}

.large-card-back-text {
  font-size: 1.05rem;
  color: #cbd5e1;
  line-height: 1.65;
  margin-top: 16px;
}

.large-card-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 24px;
}

/* Big Section: Module Master Quiz Modal */
.module-quiz-badge-btn {
  background: linear-gradient(135deg, #4338ca, #3b82f6);
  color: #fff;
  border: none;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}

.module-quiz-badge-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}