/* Rajasthan History SPA Design System */
@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500&family=Inter:wght@300;400;500;600;700&family=Rozha+One&family=Tiro+Devanagari+Hindi:ital@0;1&display=swap');

:root {
  /* Primary & Accent Palette */
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-tertiary: #1e293b;
  --bg-card: rgba(30, 41, 59, 0.7);
  --bg-glass: rgba(15, 23, 42, 0.75);
  
  --border-color: rgba(255, 255, 255, 0.1);
  --border-highlight: rgba(245, 158, 11, 0.4);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-gold: #f59e0b;
  --accent-gold-hover: #d97706;
  --accent-amber: #fbbf24;
  --accent-crimson: #e11d48;
  --accent-blue: #38bdf8;
  --accent-emerald: #10b981;
  --accent-purple: #a855f7;
  
  /* Status colors */
  --correct-bg: rgba(16, 185, 129, 0.15);
  --correct-border: #10b981;
  --correct-text: #34d399;
  --wrong-bg: rgba(225, 29, 72, 0.15);
  --wrong-border: #e11d48;
  --wrong-text: #f43f5e;
  
  /* Fonts */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-hindi: 'Tiro Devanagari Hindi', 'Rozha One', serif;
  --font-mono: 'Fira Code', monospace;
  
  /* Dimensions & Transitions */
  --sidebar-width: 320px;
  --header-height: 70px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-glow: 0 0 20px rgba(245, 158, 11, 0.15);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-hindi), var(--font-main);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.7;
}

/* App Layout */
#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  z-index: 1000;
  transition: var(--transition);
}

.brand-container {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.toggle-sidebar-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  transition: var(--transition);
}

.toggle-sidebar-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}

.brand-title {
  font-family: 'Rozha One', var(--font-hindi);
  font-size: 1.4rem;
  color: var(--accent-gold);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.brand-title span.badge {
  background: linear-gradient(135deg, var(--accent-gold), #b45309);
  color: #fff;
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  font-family: var(--font-main);
  font-weight: 600;
}

.header-center {
  flex: 1;
  max-width: 450px;
  margin: 0 1.5rem;
}

.search-box {
  position: relative;
  width: 100%;
}

.search-box input {
  width: 100%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 25px;
  padding: 0.5rem 1rem 0.5rem 2.5rem;
  color: var(--text-primary);
  font-family: var(--font-hindi);
  font-size: 0.95rem;
  transition: var(--transition);
}

.search-box input:focus {
  outline: none;
  border-color: var(--accent-gold);
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.25);
}

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

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Mode Switcher Pills */
.view-mode-toggle {
  display: flex;
  background: var(--bg-tertiary);
  padding: 0.25rem;
  border-radius: 30px;
  border: 1px solid var(--border-color);
}

.mode-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.4rem 0.9rem;
  border-radius: 20px;
  font-family: var(--font-hindi);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.mode-btn.active {
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-hover));
  color: #0f172a;
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

.header-action-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: var(--font-hindi);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition);
}

.header-action-btn:hover {
  background: rgba(245, 158, 11, 0.15);
  border-color: var(--accent-gold);
  color: var(--accent-amber);
}

/* Main Container Layout */
.main-wrapper {
  display: flex;
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
  position: relative;
}

/* Sidebar Drawer */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  position: fixed;
  top: var(--header-height);
  bottom: 0;
  left: 0;
  overflow-y: auto;
  z-index: 900;
  transition: var(--transition);
  padding: 1.25rem 0.75rem;
}

body.focus-mode .sidebar,
body.sidebar-collapsed .sidebar {
  transform: translateX(-100%);
}

.sidebar-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-gold);
  margin-bottom: 0.75rem;
  padding: 0 0.75rem;
  font-weight: 700;
}

.chapter-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.chapter-nav-item a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  transition: var(--transition);
  border: 1px solid transparent;
}

.chapter-nav-item a:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.chapter-nav-item.active a {
  background: rgba(245, 158, 11, 0.12);
  color: var(--accent-gold);
  border-color: var(--border-highlight);
  font-weight: 600;
}

.chapter-nav-item .ch-badge {
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.06);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  color: var(--text-muted);
}

.chapter-nav-item.active .ch-badge {
  background: var(--accent-gold);
  color: #0f172a;
}

/* Main Content Area */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 2rem 3rem 6rem 3rem;
  transition: var(--transition);
  max-width: 1200px;
}

body.focus-mode .main-content,
body.sidebar-collapsed .main-content {
  margin-left: 0;
  max-width: 1000px;
  margin-right: auto;
  margin-left: auto;
}

/* Chapter Content Cards & Formatting */
.content-wrapper {
  animation: fadeIn 0.35s ease-out;
}

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

.chapter-header {
  border-bottom: 2px solid var(--border-highlight);
  padding-bottom: 1.25rem;
  margin-bottom: 2rem;
}

.chapter-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent-gold), #b45309);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  margin-bottom: 0.5rem;

}

.chapter-title-main {
  font-family: 'Rozha One', var(--font-hindi);
  font-size: 2.2rem;
  color: var(--text-primary);
  line-height: 1.3;
}

.chapter-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-top: 0.4rem;
}

/* Topic Card */
.topic-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  margin-bottom: 1.75rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.topic-card:hover {
  border-color: rgba(245, 158, 11, 0.3);
}

.topic-title {
  font-family: 'Rozha One', var(--font-hindi);
  font-size: 1.4rem;
  color: var(--accent-amber);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  border-bottom: 1px dashed var(--border-color);
  padding-bottom: 0.5rem;
}

.topic-title i {
  color: var(--accent-gold);
}

/* Typography & Lists */
p {
  margin-bottom: 1rem;
  color: var(--text-primary);
  font-size: 1.05rem;
}

.bullet-list {
  list-style: none;
  margin-bottom: 1rem;
}

.bullet-item {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.65rem;
  color: var(--text-primary);
  font-size: 1.02rem;
}

.bullet-item::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-gold);
  font-weight: bold;
}

/* Key Fact Badges & Highlights */
.key-fact-badge {
  display: inline-block;
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.88rem;
  font-weight: 600;
  margin-right: 0.4rem;
}

.tag-badge {
  display: inline-block;
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-blue);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.85rem;
  margin-right: 0.3rem;
}

.trick-box {
  background: rgba(168, 85, 247, 0.1);
  border-left: 4px solid var(--accent-purple);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1rem 0;
}

.trick-box .trick-title {
  color: #c084fc;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.3rem;
}

/* Data Tables */
.table-responsive {
  overflow-x: auto;
  margin: 1.25rem 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.data-table th {
  background: var(--bg-tertiary);
  color: var(--accent-gold);
  padding: 0.75rem 1rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
}

.data-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
}

.data-table tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

.data-table tr:hover {
  background: rgba(245, 158, 11, 0.05);
}

/* Diagram Container */
.diagram-container {
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin: 1.5rem 0;
  text-align: center;
  overflow-x: auto;
}

.diagram-container svg {
  max-width: 100%;
  height: auto;
}

.diagram-caption {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-top: 0.6rem;
  font-style: italic;
}

/* MCQ Quiz Container */
.quiz-section {
  margin-top: 3rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-glow);
}

.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
}

.quiz-title {
  font-family: 'Rozha One', var(--font-hindi);
  font-size: 1.6rem;
  color: var(--accent-amber);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.quiz-score-badge {
  background: var(--bg-tertiary);
  border: 1px solid var(--accent-gold);
  color: var(--accent-gold);
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-weight: 700;
  font-size: 0.95rem;
}

.quiz-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  transition: var(--transition);
}

.quiz-question-num {
  font-size: 0.85rem;
  color: var(--accent-gold);
  font-weight: 700;
  margin-bottom: 0.4rem;

}

.quiz-question-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.quiz-option-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-family: var(--font-hindi);
  font-size: 1rem;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.quiz-option-btn:hover:not(:disabled) {
  border-color: var(--accent-gold);
  background: rgba(245, 158, 11, 0.08);
}

.quiz-option-btn.correct {
  background: var(--correct-bg) !important;
  border-color: var(--correct-border) !important;
  color: var(--correct-text) !important;
  font-weight: 600;
}

.quiz-option-btn.wrong {
  background: var(--wrong-bg) !important;
  border-color: var(--wrong-border) !important;
  color: var(--wrong-text) !important;
}

.option-prefix {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 50%;
  font-size: 0.85rem;
  font-weight: 700;
  flex-shrink: 0;
}

.quiz-explanation {
  margin-top: 1rem;
  padding: 0.85rem 1.1rem;
  background: rgba(56, 189, 248, 0.1);
  border-left: 3px solid var(--accent-blue);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: #e0f2fe;
  font-size: 0.95rem;
  display: none;
}

.quiz-explanation.show {
  display: block;
  animation: fadeIn 0.2s ease-in;
}

.quiz-footer-actions {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  margin-top: 1.5rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-hover));
  color: #0f172a;
  border: none;
  padding: 0.6rem 1.4rem;
  border-radius: 25px;
  font-family: var(--font-hindi);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);

}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.4);
}

/* Sticky Bottom Navigation Bar */
.bottom-nav-bar {
  position: fixed;
  bottom: 0;
  left: var(--sidebar-width);
  right: 0;
  height: 60px;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  z-index: 850;
  transition: var(--transition);
}

body.focus-mode .bottom-nav-bar,
body.sidebar-collapsed .bottom-nav-bar {
  left: 0;
}

.nav-ch-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.4rem 1.2rem;
  border-radius: 20px;
  text-decoration: none;
  font-family: var(--font-hindi);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
}

.nav-ch-btn:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
  background: rgba(245, 158, 11, 0.1);
}

.nav-ch-btn.disabled {
  opacity: 0.4;
  pointer-events: none;
}

/* Focus Overlay Esc Indicator */
.focus-indicator {
  position: fixed;
  top: 80px;
  right: 20px;
  background: rgba(0, 0, 0, 0.8);
  border: 1px solid var(--accent-gold);
  color: var(--accent-amber);
  padding: 0.4rem 0.9rem;
  border-radius: 20px;
  font-size: 0.8rem;
  z-index: 1001;
  display: none;
}

body.focus-mode .focus-indicator {
  display: block;
}

/* Responsive Styles */
@media (max-width: 992px) {
  .sidebar {
    transform: translateX(-100%);
  }
  
  body.sidebar-open .sidebar {
    transform: translateX(0);
    box-shadow: 10px 0 30px rgba(0, 0, 0, 0.5);
  }
  
  .main-content {
    margin-left: 0;
    padding: 1.5rem 1rem 5rem 1rem;
  }
  
  .bottom-nav-bar {
    left: 0;
  }

  .header-center {
    display: none;
  }
}

@media print {
  .app-header, .sidebar, .bottom-nav-bar, .quiz-section, .view-mode-toggle, .header-action-btn, .focus-indicator {
    display: none !important;
  }

  .main-content {
    margin: 0 !important;
    padding: 0 !important;
    max-width: 100% !important;
  }

  body {
    background: #fff !important;
    color: #000 !important;
  }

  .topic-card {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    page-break-inside: avoid;
  }

  .chapter-title-main, .topic-title {
    color: #000 !important;
  }

  .key-fact-badge {
    border: 1px solid #000;
    color: #000;
  }
}