/* ==========================================================================
   Sikh History Timeline - Premium Custom CSS Stylesheet
   Designed with a Dark "Sikh Royal" theme & Native Scroll-Driven Animations
   ========================================================================== */

/* Design Tokens & Theme Variables */
:root {
  --bg-primary: #080a0e;
  --bg-secondary: #10141e;
  --bg-tertiary: #161c2b;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  /* Sikh Royal Color Palette */
  --accent-gold: #d97706;
  --accent-gold-light: #fbbf24;
  --accent-gold-glow: rgba(217, 119, 6, 0.35);
  
  --accent-blue: #1e3a8a;
  --accent-blue-light: #3b82f6;
  --accent-blue-glow: rgba(59, 130, 246, 0.25);
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: var(--accent-gold);
  
  /* Glassmorphism Styles */
  --glass-bg: rgba(16, 20, 30, 0.65);
  --glass-border: rgba(255, 255, 255, 0.06);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --glass-backdrop: blur(16px);
  
  --font-family-title: 'Outfit', sans-serif;
  --font-family-body: 'Inter', sans-serif;
  
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme overrides (Optional / In case toggle is needed later) */
.light-theme {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --accent-gold: #b45309;
  --accent-gold-light: #d97706;
  --accent-gold-glow: rgba(180, 83, 9, 0.2);
  
  --accent-blue: #1d4ed8;
  --accent-blue-light: #2563eb;
  --accent-blue-glow: rgba(37, 99, 235, 0.15);
  
  --border-color: rgba(15, 23, 42, 0.08);
  
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(15, 23, 42, 0.06);
  --glass-shadow: 0 8px 32px 0 rgba(15, 23, 42, 0.08);
  --glass-backdrop: blur(16px);
}

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

html {
  scroll-behavior: smooth;
}

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

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-gold);
}

/* Scroll-Driven Animations: Top Scroll Progress Bar */
@media (prefers-reduced-motion: no-preference) {
  @supports (animation-timeline: scroll()) {
    @keyframes grow-progress {
      from { transform: scaleX(0); }
      to { transform: scaleX(1); }
    }
    
    #scroll-progress-bar {
      position: fixed;
      left: 0;
      top: 0;
      width: 100%;
      height: 4px;
      background: linear-gradient(to right, var(--accent-blue-light), var(--accent-gold), var(--accent-gold-light));
      transform-origin: 0 50%;
      z-index: 1000;
      animation: grow-progress auto linear;
      animation-timeline: scroll();
    }
  }
}

/* Fallback for Top Progress Bar (Updates via JS scroll event) */
#scroll-progress-bar {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(to right, var(--accent-blue-light), var(--accent-gold), var(--accent-gold-light));
  transform-origin: 0 50%;
  transform: scaleX(0);
  z-index: 1000;
}

/* Common UI Components & Buttons */
.glass-btn {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 9999px;
  color: var(--text-primary);
  padding: 0.6rem 1.2rem;
  font-family: var(--font-family-body);
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-fast);
  backdrop-filter: var(--glass-backdrop);
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.glass-btn:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--accent-gold);
  transform: translateY(-2px);
  box-shadow: 0 0 12px var(--accent-gold-glow);
}

.glass-btn:active {
  transform: translateY(0);
}

.badge {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.3);
  color: var(--accent-blue-light);
  letter-spacing: 0.05em;
}

.badge.gold {
  background: rgba(217, 119, 6, 0.15);
  border: 1px solid rgba(217, 119, 6, 0.3);
  color: var(--accent-gold-light);
}

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

/* Hero Header styling */
.app-header {
  position: relative;
  background: linear-gradient(135deg, #050c18 0%, #0c192d 50%, #061021 100%);
  padding: 4rem 2rem;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
}

/* Decorative backdrop glow */
.app-header::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 140%;
  height: 140%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.08) 0%, rgba(217, 119, 6, 0.05) 40%, transparent 70%);
  z-index: 0;
  pointer-events: none;
}

.header-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.top-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2.5rem;
}

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

.logo-icon-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(14, 165, 233, 0.15); /* Concentric outer ring 2 */
  padding: 4px;
  box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.08); /* Concentric outer ring 1 */
  transition: var(--transition-medium);
  animation: logo-pulse 3s infinite ease-in-out;
}

.logo-icon-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: #F59E0B; /* Gold/Orange background */
  color: #0c192d; /* Dark Blue Gurmukhi symbol color */
  font-size: 1.4rem;
  font-weight: 800;
  font-family: "Gurmukhi MN", "Mukta Mahee", "Noto Sans Gurmukhi", "Kohinoor Gurmukhi", sans-serif;
  text-shadow: 0px 1px 1px rgba(0, 0, 0, 0.15);
}

@keyframes logo-pulse {
  0%, 100% {
    transform: scale(1);
    box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.08);
  }
  50% {
    transform: scale(1.05);
    box-shadow: 0 0 0 8px rgba(14, 165, 233, 0.15);
  }
}

.logo-text {
  font-family: var(--font-family-title);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: linear-gradient(to right, var(--text-primary), var(--accent-gold-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}


.title-glow {
  font-family: var(--font-family-title);
  font-weight: 800;
  font-size: 3rem;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  color: var(--text-primary);
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.6;
  margin-bottom: 2rem;
}

.header-stats {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.stat-badge {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  padding: 0.4rem 1rem;
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.stat-badge span {
  color: var(--accent-gold-light);
  font-weight: 700;
}

/* Sticky Toolbar & Controls Styling */
.toolbar-section {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 10, 14, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  transition: var(--transition-smooth);
}

.toolbar-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

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

.search-icon {
  position: absolute;
  left: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1rem;
}

.search-box input {
  width: 100%;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 0.8rem 1.25rem 0.8rem 3rem;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font-family-body);
  transition: var(--transition-fast);
}

.search-box input:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--accent-gold-light);
  box-shadow: 0 0 10px rgba(251, 191, 36, 0.15);
}

.clear-btn {
  position: absolute;
  right: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.2rem;
  font-size: 1rem;
}

.clear-btn:hover {
  color: var(--text-primary);
}

.filters-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-group label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.filter-group select {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  padding: 0.4rem 0.8rem;
  font-family: var(--font-family-body);
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
  transition: var(--transition-fast);
}

.filter-group select:focus {
  border-color: var(--accent-gold-light);
  background: var(--bg-secondary);
}

.text-link-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-family-body);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.5rem;
  transition: var(--transition-fast);
}

.text-link-btn:hover {
  color: var(--accent-gold-light);
}

/* Eras Horizontal Scroll Bar styling */
.eras-nav {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 2rem;
  overflow-x: auto;
  white-space: nowrap;
  position: sticky;
  top: 104px; /* Stack directly under sticky toolbar */
  z-index: 99;
}

.eras-nav::-webkit-scrollbar {
  height: 4px;
}

.eras-scroll-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  gap: 0.75rem;
}

.era-tab {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  font-family: var(--font-family-body);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.5rem 1.25rem;
  border-radius: 999px;
  cursor: pointer;
  transition: var(--transition-fast);
}

.era-tab:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.03);
}

.era-tab.active {
  background: rgba(217, 119, 6, 0.1);
  border-color: var(--accent-gold-glow);
  color: var(--accent-gold-light);
  box-shadow: 0 0 10px rgba(217, 119, 6, 0.05);
}

/* Main Timeline Section Layout */
.timeline-main {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 80px 1fr; /* Navigator and main flow */
  padding: 4rem 2rem;
  gap: 2rem;
  position: relative;
}

/* Side Centennial Navigator Slider (Sticky) */
.centennial-navigator {
  position: sticky;
  top: 200px;
  height: 450px;
  align-self: start;
  z-index: 10;
}

.navigator-track {
  position: relative;
  width: 4px;
  height: 100%;
  background: rgba(255, 255, 255, 0.05);
  margin: 0 auto;
  border-radius: 99px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 10px 0;
}

/* Highlight line showing scroll position */
.navigator-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0%;
  background: linear-gradient(to bottom, var(--accent-blue-light), var(--accent-gold));
  border-radius: 99px;
  transition: height 0.1s ease-out;
}

.century-node {
  position: relative;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--text-muted);
  cursor: pointer;
  left: -4px; /* Centering node on the track */
  transition: var(--transition-fast);
}

.century-node:hover {
  border-color: var(--accent-gold-light);
  transform: scale(1.3);
}

.century-node.active {
  background: var(--accent-gold-light);
  border-color: var(--accent-gold);
  box-shadow: 0 0 8px var(--accent-gold-glow);
}

.century-node span {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  white-space: nowrap;
  pointer-events: none;
  transition: var(--transition-fast);
}

.century-node:hover span,
.century-node.active span {
  color: var(--text-primary);
}

/* Vertical Timeline Track Grid styling */
.timeline-container {
  position: relative;
}

.timeline-spine {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, 
    rgba(59, 130, 246, 0.25) 0%, 
    rgba(217, 119, 6, 0.25) 50%, 
    rgba(59, 130, 246, 0.25) 100%);
  border-radius: 99px;
  z-index: 1;
}

.timeline-flow {
  display: flex;
  flex-direction: column;
  gap: 3rem;
  position: relative;
  z-index: 2;
}

/* Timeline Cards entry animations */
@media (prefers-reduced-motion: no-preference) {
  @supports (animation-timeline: view()) {
    .timeline-card-wrapper {
      view-timeline: --reveal block;
    }
    
    .timeline-card {
      animation: card-appear auto linear forwards;
      animation-timeline: --reveal;
      animation-range: entry 10% cover 30%;
      opacity: 0;
    }
    
    @keyframes card-appear {
      from {
        opacity: 0;
        transform: scale(0.9) translateY(40px);
      }
      to {
        opacity: 1;
        transform: scale(1) translateY(0);
      }
    }
  }
}

/* Event Card layout and positioning */
.timeline-card-wrapper {
  display: flex;
  justify-content: flex-start;
  width: 100%;
  position: relative;
}

/* Even/Odd Card placement alternating */
.timeline-card-wrapper:nth-child(even) {
  justify-content: flex-end;
}

.timeline-card {
  width: 46%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  backdrop-filter: var(--glass-backdrop);
  border-radius: 12px;
  padding: 1.5rem;
  position: relative;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), border-color 0.3s ease;
}

.timeline-card:hover {
  transform: translateY(-5px) scale(1.01);
  border-color: var(--accent-gold);
  box-shadow: 0 10px 24px -10px rgba(217,119,6,0.15), var(--glass-shadow);
}

/* Connector Dot linking card to center track line */
.card-dot {
  position: absolute;
  top: 2rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--accent-blue-light);
  z-index: 3;
  transition: var(--transition-smooth);
}

.timeline-card-wrapper:nth-child(odd) .card-dot {
  right: -8.8%; /* Align exactly over center line */
}

.timeline-card-wrapper:nth-child(even) .card-dot {
  left: -8.8%; /* Align exactly over center line */
}

/* Card importance customization */
.timeline-card.important-card {
  border-color: rgba(217, 119, 6, 0.25);
  background: linear-gradient(135deg, rgba(16, 20, 30, 0.8) 0%, rgba(26, 20, 16, 0.7) 100%);
}

.timeline-card.important-card .card-dot {
  border-color: var(--accent-gold);
  background: var(--accent-gold-light);
  box-shadow: 0 0 10px var(--accent-gold-glow);
}

.timeline-card.important-card:hover {
  border-color: var(--accent-gold-light);
}

/* Card content details styling */
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
}

.card-year {
  font-family: var(--font-family-title);
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--accent-gold-light);
  line-height: 1;
}

.card-tags {
  display: flex;
  gap: 0.5rem;
}

.card-title {
  font-family: var(--font-family-title);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  line-height: 1.3;
}

.card-location {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
}

.card-desc {
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-footer {
  display: flex;
  justify-content: flex-end;
}

/* Explore Link Button inside cards */
.explore-btn {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.4rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  transition: var(--transition-fast);
}

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

/* Empty State / Loading State styling */
.loading-state,
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  color: var(--text-secondary);
  font-size: 1.1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.loading-state i,
.empty-state i {
  font-size: 2.5rem;
  color: var(--accent-gold-light);
}

/* Detail Sidebar Modal Drawer Styling */
.detail-drawer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1000;
  display: flex;
  visibility: hidden;
  transition: visibility 0.4s;
}

.detail-drawer.open {
  visibility: visible;
}

.drawer-backdrop {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.detail-drawer.open .drawer-backdrop {
  opacity: 1;
}

.drawer-sheet {
  position: absolute;
  top: 0; right: 0;
  width: 100%;
  max-width: 500px;
  height: 100%;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  box-shadow: -10px 0 30px rgba(0,0,0,0.5);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 2;
}

.detail-drawer.open .drawer-sheet {
  transform: translateX(0);
}

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

.drawer-meta {
  display: flex;
  gap: 0.5rem;
}

.close-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.close-btn:hover {
  color: var(--text-primary);
  transform: rotate(90deg);
}

.drawer-body {
  padding: 2rem 1.5rem;
  overflow-y: auto;
  flex: 1;
}

.drawer-body h2 {
  font-family: var(--font-family-title);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.drawer-info-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.info-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  padding: 0.8rem 1rem;
  border-radius: 8px;
}

.info-icon {
  font-size: 1.2rem;
  color: var(--accent-gold-light);
  width: 20px;
}

.info-item strong {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.info-item span {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

.drawer-divider {
  border: 0;
  height: 1px;
  background: var(--border-color);
  margin: 1.5rem 0;
}

.drawer-description {
  margin-bottom: 2rem;
}

.drawer-description strong {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  letter-spacing: 0.05em;
}

.drawer-description p {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.drawer-footer-actions {
  display: flex;
  gap: 1rem;
}

.action-btn {
  flex: 1;
  justify-content: center;
  padding: 0.8rem;
  border-radius: 8px;
  font-size: 0.9rem;
}

/* Footer layout */
.app-footer {
  background: #050609;
  border-top: 1px solid var(--border-color);
  padding: 3rem 2rem;
  text-align: center;
  color: var(--text-muted);
}

.footer-content {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-content p {
  font-size: 0.9rem;
}

.footer-credits {
  font-size: 0.8rem;
  opacity: 0.7;
}

/* ==========================================================================
   Responsive Styling (Mobile, Tablet, Desktop)
   ========================================================================== */

/* Tablet Screens (up to 1024px) */
@media (max-width: 1024px) {
  .title-glow {
    font-size: 2.5rem;
  }
  
  .timeline-main {
    grid-template-columns: 60px 1fr;
    padding: 3rem 1.5rem;
  }
  
  .timeline-card {
    width: 44%;
  }
  
  .timeline-card-wrapper:nth-child(odd) .card-dot {
    right: -13.5%;
  }

  .timeline-card-wrapper:nth-child(even) .card-dot {
    left: -13.5%;
  }
}

/* Mobile Screens (up to 768px) */
@media (max-width: 768px) {
  /* Restructure sticky header/toolbar */
  .app-header {
    padding: 2.5rem 1rem;
  }
  
  .top-row {
    margin-bottom: 1.5rem;
  }
  
  .title-glow {
    font-size: 2rem;
  }
  
  .subtitle {
    font-size: 0.95rem;
  }
  
  .toolbar-section {
    padding: 0.75rem 1rem;
  }
  
  .eras-nav {
    top: 96px;
    padding: 0.5rem 1rem;
  }
  
  /* Shift timeline spine and navigator for mobile layout */
  .timeline-main {
    grid-template-columns: 1fr; /* Hide centennial slider or put inline */
    padding: 2rem 1rem;
  }
  
  .centennial-navigator {
    display: none; /* Hide side navigator on small mobile screens */
  }
  
  .timeline-spine {
    left: 20px; /* Align to the left */
    transform: none;
  }
  
  /* Layout all cards on the right side of the spine */
  .timeline-card-wrapper {
    justify-content: flex-start !important;
    padding-left: 40px;
    width: 100%;
  }
  
  .timeline-card {
    width: 100% !important;
    padding: 1.25rem;
  }
  
  .card-dot {
    left: -32px !important;
    top: 1.5rem;
    right: auto !important;
  }
  
  .filters-row {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }
  
  .filter-group {
    justify-content: space-between;
  }
  
  .filter-group select {
    width: 60%;
  }
  
  .drawer-sheet {
    max-width: 100%;
  }
}

/* ==========================================================================
   Antigravity Team Custom Themes & Admin CRUD Styles
   ========================================================================== */

/* Smooth Theme Transitions */
body, 
.app-header, 
.toolbar-section, 
.eras-nav, 
.timeline-card, 
.centennial-navigator, 
.app-footer, 
.detail-drawer, 
.glass-btn, 
input, 
select, 
textarea, 
.navigator-track,
.century-node,
.timeline-spine {
  transition: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

.header-controls {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  z-index: 10;
}

.admin-fab {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  background: var(--accent-gold);
  border: 1px solid var(--accent-gold-light);
  color: #ffffff;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(217, 119, 6, 0.4);
  z-index: 100;
  transition: transform 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}
.admin-fab:hover {
  transform: scale(1.1);
  background: var(--accent-gold-light);
  box-shadow: 0 6px 24px rgba(217, 119, 6, 0.6);
}
.admin-fab:active {
  transform: scale(0.95);
}

/* Modals System */
.modal-dialog-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.modal-dialog-wrapper.open {
  opacity: 1;
  pointer-events: auto;
}
.modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(8, 10, 14, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1;
}
.modal-content {
  position: relative;
  width: 90%;
  max-width: 480px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  box-shadow: var(--glass-shadow);
  border-radius: 16px;
  z-index: 2;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(20px);
  transition: transform 0.3s ease;
  max-height: 90vh;
}
.modal-dialog-wrapper.open .modal-content {
  transform: translateY(0);
}
.modal-content.large-modal {
  max-width: 760px;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-tertiary);
}
.modal-header h3 {
  font-family: var(--font-family-title);
  font-size: 1.25rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.modal-header h3 i {
  color: var(--accent-gold);
}
.modal-header .close-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
}
.modal-header .close-btn:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
}

/* Form controls */
#login-form, #editor-form {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  overflow-y: auto;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}
.form-group input, 
.form-group select, 
.form-group textarea {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  padding: 0.75rem;
  font-family: var(--font-family-body);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition-fast);
}
.form-group input:focus, 
.form-group select:focus, 
.form-group textarea:focus {
  border-color: var(--accent-gold);
  box-shadow: 0 0 0 2px var(--accent-gold-glow);
}
.form-row {
  display: flex;
  gap: 1rem;
}
.form-row .half {
  flex: 1;
}
.form-row .third {
  flex: 1;
}

@media (max-width: 768px) {
  .form-row {
    flex-direction: column;
    gap: 1.25rem;
  }
}

.form-error-msg {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #ef4444;
  padding: 0.75rem;
  border-radius: 8px;
  font-size: 0.85rem;
}

/* Buttons inside forms */
.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  padding-top: 0.5rem;
}
.primary-btn, .danger-btn {
  font-family: var(--font-family-body);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: var(--transition-fast);
}
.primary-btn {
  background: var(--accent-gold);
  border: 1px solid var(--accent-gold-light);
  color: #ffffff;
}
.primary-btn:hover {
  background: var(--accent-gold-light);
}
.danger-btn {
  background: #ef4444;
  border: 1px solid #f87171;
  color: #ffffff;
}
.danger-btn:hover {
  background: #dc2626;
}

/* Card actions styling */
.admin-card-actions {
  margin-left: auto;
  display: flex;
  gap: 0.5rem;
}
.admin-card-actions button {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}
.admin-card-actions button:hover {
  background: var(--bg-primary);
  color: var(--text-primary);
}
.admin-card-actions .edit-btn:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold-light);
}
.admin-card-actions .delete-btn:hover {
  border-color: #ef4444;
  color: #f87171;
}

/* Confirmation Dialog specific styles */
.confirmation-card {
  max-width: 400px;
}
.confirm-body {
  padding: 1.5rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Extra adjustments for light theme on dark-theme classes */
.light-theme .modal-backdrop {
  background: rgba(241, 245, 249, 0.8);
}
.light-theme .modal-header {
  background: var(--bg-primary);
}

.light-theme .app-header {
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 50%, #cbd5e1 100%);
  border-bottom: 1px solid var(--border-color);
}

.light-theme .toolbar-section {
  background: rgba(248, 250, 252, 0.95);
  border-bottom: 1px solid var(--border-color);
}

.light-theme .search-box input,
.light-theme .filter-group select {
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.12);
  color: var(--text-primary);
}

.light-theme .search-box input:focus,
.light-theme .filter-group select:focus {
  background: #ffffff;
  border-color: var(--accent-gold);
  box-shadow: 0 0 0 2px rgba(180, 83, 9, 0.15);
}

.light-theme .timeline-card.important-card {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(254, 243, 199, 0.9) 100%);
  border-color: rgba(217, 119, 6, 0.2);
}

.light-theme .navigator-track {
  background: rgba(15, 23, 42, 0.08);
}

.light-theme .app-footer {
  background: var(--bg-tertiary);
}

/* Custom Tag Pills Styling */
.card-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0.5rem 0 0.75rem 0;
}

.tag-pill {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.15);
  color: var(--accent-blue-light);
  transition: var(--transition-fast);
}

.tag-pill:hover {
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-blue);
  cursor: pointer;
}

.light-theme .tag-pill {
  background: rgba(29, 78, 216, 0.06);
  border-color: rgba(29, 78, 216, 0.12);
  color: var(--accent-blue);
}

.light-theme .tag-pill:hover {
  background: rgba(29, 78, 216, 0.1);
}

/* Horizontal Era Navigator Card */
.era-navigator-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem 1.25rem;
  margin: 2rem auto;
  max-width: 960px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2), 0 8px 10px -6px rgba(0, 0, 0, 0.2);
  z-index: 10;
  position: relative;
  text-align: center;
}

.light-theme .era-navigator-card {
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
}

.era-navigator-title {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent-gold-light);
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.light-theme .era-navigator-title {
  color: var(--accent-blue);
}

.era-navigator-track {
  position: relative;
  margin: 1.25rem 0 1.75rem 0;
  width: 100%;
}

.era-navigator-line {
  position: absolute;
  top: 22px; /* Middle of the 44px circle nodes */
  left: 6%;
  right: 6%;
  height: 4px;
  background: var(--accent-gold-light);
  z-index: 1;
  opacity: 0.7;
}

.light-theme .era-navigator-line {
  background: var(--accent-gold);
}

.era-navigator-nodes-wrapper {
  display: flex;
  justify-content: space-between;
  width: 100%;
  position: relative;
  z-index: 2;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  gap: 0.5rem;
}

.era-navigator-nodes-wrapper::-webkit-scrollbar {
  display: none;
}
.era-navigator-nodes-wrapper {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.era-navigator-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  flex: 1;
  min-width: 120px;
  text-align: center;
  position: relative;
}

.era-node-circle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: var(--transition-fast);
  border: 2px solid var(--border-color);
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.light-theme .era-node-circle {
  background: #cbd5e1;
  color: #475569;
  border-color: #cbd5e1;
}

.era-navigator-node:hover .era-node-circle {
  transform: scale(1.08);
  background: var(--accent-gold-light);
  color: #0c192d;
}

.era-node-years {
  font-size: 0.7rem;
  font-weight: 700;
  margin-top: 0.6rem;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.era-node-name {
  font-size: 0.76rem;
  font-weight: 600;
  margin-top: 0.15rem;
  color: var(--text-secondary);
  transition: var(--transition-fast);
  line-height: 1.1;
}

/* Active Node State */
.era-navigator-node.active .era-node-circle {
  background: var(--accent-gold);
  color: #ffffff;
  border-color: var(--accent-gold);
  box-shadow: 0 0 0 4px var(--bg-card), 0 0 0 6px var(--accent-gold);
}

.light-theme .era-navigator-node.active .era-node-circle {
  background: var(--accent-gold);
  color: #ffffff;
  border-color: var(--accent-gold);
  box-shadow: 0 0 0 4px #ffffff, 0 0 0 6px var(--accent-gold);
}

.era-navigator-node.active .era-node-years {
  color: var(--accent-blue-light);
  font-weight: 800;
}

.light-theme .era-navigator-node.active .era-node-years {
  color: var(--accent-blue);
  font-weight: 800;
}

.era-navigator-node.active .era-node-name {
  color: var(--text-primary);
  font-weight: 700;
}

/* Reset Button */
.navigator-all-btn-container {
  display: flex;
  justify-content: center;
  margin-top: 0.75rem;
}

.era-navigator-card button.era-tab {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.4rem 1.25rem;
  border-radius: 30px;
  font-weight: 600;
  font-size: 0.8rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.era-navigator-card button.era-tab:hover,
.era-navigator-card button.era-tab.active {
  background: var(--accent-blue-light);
  color: #ffffff;
  border-color: var(--accent-blue-light);
}

.light-theme .era-navigator-card button.era-tab:hover,
.light-theme .era-navigator-card button.era-tab.active {
  background: var(--accent-blue);
  color: #ffffff;
  border-color: var(--accent-blue);
}

/* About Sikh History & Gurus Section */
.about-section-card {
  display: flex;
  gap: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  margin: 1rem auto 2.5rem auto;
  max-width: 960px;
  text-align: left;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2);
}

.light-theme .about-section-card {
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
}

.about-left {
  flex: 1.3;
}

.about-left h2 {
  font-family: var(--font-family-title);
  font-size: 1.5rem;
  color: var(--accent-gold-light);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.light-theme .about-left h2 {
  color: var(--accent-blue);
}

.about-left p {
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.about-left p:last-child {
  margin-bottom: 0;
}

.about-right-gurus-list {
  flex: 1;
  background: rgba(245, 158, 11, 0.04);
  border: 1px solid rgba(245, 158, 11, 0.15);
  border-radius: 10px;
  padding: 1.5rem;
}

.light-theme .about-right-gurus-list {
  background: #FFFBEB;
  border-color: rgba(217, 119, 6, 0.18);
}

.about-right-gurus-list h3 {
  font-family: var(--font-family-title);
  font-size: 1.15rem;
  color: var(--accent-gold-light);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 2px solid rgba(245, 158, 11, 0.25);
  padding-bottom: 0.5rem;
}

.light-theme .about-right-gurus-list h3 {
  color: var(--accent-blue);
  border-bottom-color: rgba(217, 119, 6, 0.2);
}

.about-right-gurus-list ol {
  list-style: none;
  padding: 0;
  margin: 0;
}

.about-right-gurus-list li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.45rem 0;
  border-bottom: 1px solid rgba(245, 158, 11, 0.1);
}

.light-theme .about-right-gurus-list li {
  border-bottom-color: rgba(217, 119, 6, 0.08);
}

.about-right-gurus-list li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.guru-num-badge {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-gold-light);
  font-size: 0.78rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.light-theme .guru-num-badge {
  background: #FEF3C7;
  color: #B45309;
}

.guru-item-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Responsive adjustment for About Section */
@media (max-width: 768px) {
  .about-section-card {
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.5rem;
  }
}