/* ==========================================================================
   NavDoc Web Standalone Engine — Stylesheet
   Design System moderno, responsivo com suporte a Dark/Light Mode, KaTeX, Mermaid e GitHub Pages
   ========================================================================== */

:root {
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', Consolas, Monaco, monospace;

  /* Cores - Tema Escuro (Padrão) */
  --bg-app: #0d1117;
  --bg-topbar: #161b22;
  --bg-sidebar: #13171e;
  --bg-content: #0d1117;
  --bg-card: #1c2128;
  --bg-card-hover: #22272e;
  --bg-code: #161b22;
  --border-color: #30363d;
  --border-light: rgba(255, 255, 255, 0.08);

  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --text-link: #58a6ff;

  --accent-primary: #38bdf8;
  --accent-primary-hover: #0284c7;
  --accent-primary-bg: rgba(56, 189, 248, 0.12);

  --accent-success: #34d399;
  --accent-success-bg: rgba(52, 211, 153, 0.15);
  --accent-warning: #fbbf24;
  --accent-warning-bg: rgba(251, 191, 36, 0.15);
  --accent-danger: #f87171;
  --accent-danger-bg: rgba(248, 113, 113, 0.15);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

[data-theme="light"] {
  --bg-app: #f8fafc;
  --bg-topbar: #ffffff;
  --bg-sidebar: #f1f5f9;
  --bg-content: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-code: #f1f5f9;
  --border-color: #e2e8f0;
  --border-light: rgba(0, 0, 0, 0.06);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-link: #0284c7;

  --accent-primary: #0284c7;
  --accent-primary-hover: #0369a1;
  --accent-primary-bg: rgba(2, 132, 199, 0.1);

  --accent-success: #059669;
  --accent-success-bg: rgba(5, 150, 105, 0.1);
  --accent-warning: #d97706;
  --accent-warning-bg: rgba(217, 119, 6, 0.1);
  --accent-danger: #dc2626;
  --accent-danger-bg: rgba(220, 38, 38, 0.1);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

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

.hidden {
  display: none !important;
}

/* Layout Geral */
.app-layout {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* Topbar */
.topbar {
  height: 56px;
  background-color: var(--bg-topbar);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  z-index: 20;
  flex-shrink: 0;
}

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

.brand-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-badge {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #ffffff;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.course-main-title {
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
  max-width: 280px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar-center {
  flex: 1;
  display: flex;
  justify-content: center;
  padding: 0 16px;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.crumb-chapter {
  font-weight: 500;
}

.crumb-separator {
  color: var(--text-muted);
}

.crumb-lesson {
  font-weight: 600;
  color: var(--text-primary);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.progress-container {
  display: flex;
  align-items: center;
  gap: 8px;
}

.progress-bar-bg {
  width: 90px;
  height: 6px;
  background-color: var(--border-color);
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #38bdf8, #34d399);
  transition: width 0.3s ease;
}

.progress-text {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.icon-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

/* Corpo Principal (Sidebar + Content) */
.main-body {
  display: flex;
  flex: 1;
  height: calc(100vh - 56px);
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 320px;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 10;
}

.sidebar.collapsed {
  transform: translateX(-100%);
  margin-right: -320px;
}

.sidebar-header {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0 10px;
  gap: 8px;
}

.search-box:focus-within {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 2px var(--accent-primary-bg);
}

.search-box svg {
  color: var(--text-muted);
}

.search-box input {
  width: 100%;
  height: 32px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  outline: none;
}

.clear-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.1rem;
  cursor: pointer;
}

.sidebar-stats {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 10px 8px;
}

.chapter-group {
  margin-bottom: 12px;
}

.chapter-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  user-select: none;
  transition: background 0.15s ease;
}

.chapter-header:hover {
  background-color: var(--bg-card);
  color: var(--text-primary);
}

.chapter-header svg {
  transition: transform 0.2s ease;
}

.chapter-group.collapsed .chapter-header svg {
  transform: rotate(-90deg);
}

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

.chapter-group.collapsed .lesson-list {
  display: none;
}

.lesson-item-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px 7px 18px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.83rem;
  transition: all 0.15s ease;
  border-left: 2px solid transparent;
}

.lesson-item-link:hover {
  background-color: var(--bg-card-hover);
  color: var(--text-primary);
}

.lesson-item-link.active {
  background-color: var(--accent-primary-bg);
  color: var(--accent-primary);
  font-weight: 600;
  border-left-color: var(--accent-primary);
}

.lesson-item-link.completed .lesson-title-text::after {
  content: " ✓";
  color: var(--accent-success);
  font-weight: 700;
}

.lesson-title-text {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lesson-badges {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 6px;
}

.badge-pill {
  font-size: 0.65rem;
  padding: 1px 4px;
  border-radius: 4px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

/* Área de Leitura */
.content-area {
  flex: 1;
  overflow-y: auto;
  background-color: var(--bg-content);
  padding: 24px 32px;
  scroll-behavior: smooth;
}

.content-wrapper {
  max-width: 860px;
  margin: 0 auto;
}

/* Barra de Ações da Lição */
.lesson-action-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
}

.lesson-meta-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.chapter-badge {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-primary);
  background: var(--accent-primary-bg);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.read-time-badge {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.action-buttons-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.action-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-family: var(--font-sans);
  font-size: 0.83rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.btn-presentation {
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #ffffff;
}

.btn-presentation:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-quiz {
  background: linear-gradient(135deg, #059669, #34d399);
  color: #ffffff;
}

.btn-quiz:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* Markdown & HTML5 Body Styles */
.markdown-body {
  font-size: 1.02rem;
  line-height: 1.75;
  color: var(--text-primary);
}

.markdown-body h1 {
  font-size: 2.1rem;
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.25;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 12px;
}

.markdown-body h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-top: 36px;
  margin-bottom: 14px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.markdown-body h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.markdown-body p {
  margin-bottom: 16px;
  color: var(--text-primary);
}

.markdown-body blockquote {
  border-left: 4px solid var(--accent-primary);
  background-color: var(--accent-primary-bg);
  padding: 12px 18px;
  margin: 20px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.markdown-body ul, .markdown-body ol {
  margin: 14px 0 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.markdown-body li {
  color: var(--text-primary);
}

.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background-color: var(--bg-code);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
}

/* Code Block Wrapper */
.code-block-wrapper {
  background-color: #121820;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin: 20px 0;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #18202c;
  padding: 6px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.code-lang-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--accent-primary);
}

.code-copy-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #c9d1d9;
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
}

.code-copy-btn:hover {
  background: var(--accent-primary);
  color: #000000;
}

.code-block-wrapper pre {
  margin: 0;
  padding: 16px;
  overflow-x: auto;
  background: transparent;
  border: none;
}

.code-block-wrapper pre code {
  background: transparent;
  padding: 0;
  border: none;
  font-size: 0.88rem;
  line-height: 1.6;
}

/* Mermaid Container */
.mermaid-container {
  margin: 24px 0;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  justify-content: center;
  overflow-x: auto;
}

/* KaTeX Blocks */
.katex-block {
  margin: 20px 0;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow-x: auto;
  text-align: center;
}

/* Imagens */
.markdown-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 20px auto;
  border: 1px solid var(--border-color);
  display: block;
  box-shadow: var(--shadow-sm);
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.92rem;
}

.markdown-body th, .markdown-body td {
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  text-align: left;
}

.markdown-body th {
  background-color: var(--bg-card);
  font-weight: 600;
}

.markdown-body tr:nth-child(even) {
  background-color: var(--bg-card-hover);
}

/* Desafio Prático Card */
.practice-challenge-card {
  background: linear-gradient(180deg, rgba(251, 191, 36, 0.08) 0%, rgba(251, 191, 36, 0.02) 100%);
  border: 1px solid var(--accent-warning);
  border-left: 5px solid var(--accent-warning);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  margin: 32px 0;
}

.practice-challenge-card h2 {
  color: var(--accent-warning);
  margin-top: 0;
  font-size: 1.25rem;
}

/* Gráficos Recharts */
.recharts-container {
  margin: 28px 0;
  padding: 20px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.recharts-frame {
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
}

.recharts-chart-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: 8px;
}

.recharts-svg-wrapper {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
}

.recharts-svg-wrapper svg {
  display: block;
  width: 100%;
  height: auto;
  min-height: 280px;
}

.recharts-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--border-light);
}

.recharts-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.recharts-legend-badge {
  width: 12px;
  height: 12px;
  border-radius: 3px;
}

.recharts-error-box {
  padding: 14px;
  background: var(--accent-danger-bg);
  border: 1px solid var(--accent-danger);
  border-radius: var(--radius-sm);
  color: var(--accent-danger);
  font-size: 0.88rem;
}

/* Navegação Inferior da Lição */
.lesson-footer-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.nav-lesson-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.2s ease;
  max-width: 45%;
}

.nav-lesson-btn:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.btn-text-block {
  display: flex;
  flex-direction: column;
}

.btn-text-block.text-right {
  text-align: right;
}

.btn-sub {
  font-size: 0.72rem;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--text-secondary);
}

.btn-title {
  font-size: 0.88rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 180px;
}

.complete-lesson-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.complete-lesson-btn:hover {
  border-color: var(--accent-success);
  color: var(--accent-success);
}

.complete-lesson-btn.is-completed {
  background-color: var(--accent-success-bg);
  border-color: var(--accent-success);
  color: var(--accent-success);
}

/* Modais (Apresentação & Quiz) */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}

.modal-container {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  max-height: 90vh;
}

/* Apresentação (Slides) */
.slides-container {
  width: 900px;
  max-width: 95vw;
  height: 600px;
  background: #090d13;
  color: #f0f6fc;
}

.slides-header {
  height: 52px;
  padding: 0 20px;
  background: #121822;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.slides-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.slides-badge {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(56, 189, 248, 0.2);
  color: #38bdf8;
}

.slides-title {
  font-size: 1rem;
  font-weight: 600;
  color: #ffffff;
}

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

.slides-counter {
  font-size: 0.82rem;
  color: #8b949e;
  font-weight: 600;
}

.slides-viewport {
  flex: 1;
  padding: 36px 48px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.slides-body h3 {
  font-size: 1.8rem;
  font-weight: 700;
  color: #38bdf8;
  margin-bottom: 24px;
  line-height: 1.3;
}

.slides-body img {
  max-height: 220px;
  width: auto;
  margin: 0 auto 20px auto;
  display: block;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.slides-body ul {
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 1.15rem;
  line-height: 1.6;
  padding-left: 24px;
}

.slides-body li {
  color: #e6edf3;
}

.slide-narration-box {
  margin-top: 24px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.05);
  border-left: 3px solid #38bdf8;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.88rem;
  color: #8b949e;
  font-style: italic;
}

.slides-footer {
  height: 60px;
  background: #121822;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.slide-nav-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.slide-nav-btn:hover:not(:disabled) {
  background: #38bdf8;
  color: #000000;
}

.slide-nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

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

.slide-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transition: all 0.2s ease;
}

.slide-dot.active {
  width: 20px;
  border-radius: 4px;
  background: #38bdf8;
}

/* Quiz Modal */
.quiz-container {
  width: 780px;
  max-width: 95vw;
}

.quiz-header {
  height: 52px;
  padding: 0 20px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.quiz-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.quiz-badge {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--accent-success-bg);
  color: var(--accent-success);
}

.quiz-title {
  font-size: 1rem;
  font-weight: 600;
}

.quiz-body-scroll {
  padding: 24px;
  overflow-y: auto;
  max-height: calc(85vh - 52px);
}

.quiz-questions {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.quiz-question-card {
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: border-color 0.2s ease;
}

.quiz-question-card.correct {
  border-color: var(--accent-success);
  background: var(--accent-success-bg);
}

.quiz-question-card.incorrect {
  border-color: var(--accent-danger);
  background: var(--accent-danger-bg);
}

.quiz-question-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.quiz-question-num {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-primary);
  text-transform: uppercase;
}

.quiz-question-meta {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.quiz-question-text {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.quiz-options-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.quiz-option-label {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
  font-size: 0.92rem;
}

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

.quiz-option-label input[type="radio"] {
  accent-color: var(--accent-primary);
  width: 16px;
  height: 16px;
}

.quiz-option-label.is-correct-choice {
  border-color: var(--accent-success);
  font-weight: 600;
  color: var(--accent-success);
}

.quiz-explanation-box {
  margin-top: 14px;
  padding: 10px 14px;
  background: var(--bg-card);
  border-left: 3px solid var(--accent-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.quiz-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

.quiz-submit-btn {
  flex: 1;
  padding: 12px;
  background: linear-gradient(135deg, #059669, #34d399);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.2s, transform 0.2s;
}

.quiz-submit-btn:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.quiz-reset-btn {
  padding: 12px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.quiz-score-banner {
  margin-top: 20px;
  padding: 18px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 20px;
}

.score-circle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent-primary-bg);
  border: 2px solid var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent-primary);
}

.score-details h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.score-details p {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* Responsividade */
@media (max-width: 900px) {
  .sidebar {
    position: absolute;
    top: 56px;
    left: 0;
    bottom: 0;
    box-shadow: var(--shadow-lg);
  }
  .content-area {
    padding: 18px 16px;
  }
  .topbar-center {
    display: none;
  }
  .slides-container {
    height: 90vh;
  }
  .slides-viewport {
    padding: 20px 24px;
  }
}