/* ==========================================================================
   AI Changelog Hub - Neon Terminal Theme
   ========================================================================== */

/* ---------------------------------------------------------------------------
   CSS Variables - Theme System
   --------------------------------------------------------------------------- */

:root {
  /* Dark Mode (Default) */
  --bg-primary: #0D0D0D;
  --bg-surface: #1A1A1A;
  --bg-elevated: #242424;
  --border-default: #2A2A2A;
  --border-hover: #3A3A3A;
  --text-primary: #FFFFFF;
  --text-secondary: #A0A0A0;
  --text-muted: #666666;

  /* Neon Accents */
  --neon-cyan: #00D9FF;
  --neon-cyan-glow: rgba(0, 217, 255, 0.3);
  --neon-purple: #7B61FF;
  --neon-purple-glow: rgba(123, 97, 255, 0.3);
  --neon-green: #10B981;
  --neon-green-glow: rgba(16, 185, 129, 0.3);
  --neon-amber: #F59E0B;
  --neon-amber-glow: rgba(245, 158, 11, 0.3);
  --neon-red: #EF4444;
  --neon-red-glow: rgba(239, 68, 68, 0.3);
}

/* Light Mode */
html:not(.dark) {
  --bg-primary: #FAFAFA;
  --bg-surface: #FFFFFF;
  --bg-elevated: #F5F5F5;
  --border-default: #E5E5E5;
  --border-hover: #D4D4D4;
  --text-primary: #171717;
  --text-secondary: #525252;
  --text-muted: #737373;

  /* Adjusted neon for light mode (better contrast) */
  --neon-cyan: #0891B2;
  --neon-cyan-glow: rgba(8, 145, 178, 0.15);
  --neon-purple: #7C3AED;
  --neon-purple-glow: rgba(124, 58, 237, 0.15);
  --neon-green: #059669;
  --neon-green-glow: rgba(5, 150, 105, 0.15);
  --neon-amber: #D97706;
  --neon-amber-glow: rgba(217, 119, 6, 0.15);
  --neon-red: #DC2626;
  --neon-red-glow: rgba(220, 38, 38, 0.15);
}

/* ---------------------------------------------------------------------------
   Base Styles
   --------------------------------------------------------------------------- */

html {
  scroll-behavior: smooth;
}

body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

/* ---------------------------------------------------------------------------
   Custom Scrollbar - Neon Theme
   --------------------------------------------------------------------------- */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-surface);
}

::-webkit-scrollbar-thumb {
  background: var(--border-hover);
  border-radius: 9999px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--neon-cyan);
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-hover) var(--bg-surface);
}

.scrollbar-hide {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.scrollbar-hide::-webkit-scrollbar {
  display: none;
}

/* ---------------------------------------------------------------------------
   Sidebar Styles
   --------------------------------------------------------------------------- */

#sidebar {
  background-color: var(--bg-surface);
  border-color: var(--border-default);
}

.service-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
  color: var(--text-secondary);
  transition: all 0.2s ease;
  cursor: pointer;
  border: 1px solid transparent;
}

.service-item:hover {
  background-color: var(--bg-elevated);
  color: var(--text-primary);
}

.service-item.active {
  background-color: var(--neon-cyan-glow);
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
}

.service-item .service-icon {
  width: 2rem;
  height: 2rem;
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.75rem;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-default);
}

.service-item.active .service-icon {
  background-color: var(--neon-cyan);
  color: var(--bg-primary);
  border-color: var(--neon-cyan);
}

/* ---------------------------------------------------------------------------
   Filter Buttons
   --------------------------------------------------------------------------- */

.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.75rem;
  border-radius: 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  white-space: nowrap;
  color: var(--text-muted);
  background-color: transparent;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  cursor: pointer;
}

.filter-btn:hover {
  color: var(--neon-cyan);
  background-color: var(--neon-cyan-glow);
}

.filter-btn.active {
  color: var(--neon-cyan);
  background-color: var(--neon-cyan-glow);
  border-color: var(--neon-cyan-glow);
  font-weight: 600;
}

/* ---------------------------------------------------------------------------
   Timeline & Version Cards
   --------------------------------------------------------------------------- */

.version-card {
  position: relative;
  margin-left: 2rem;
  margin-bottom: 1rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: 1rem;
  overflow: hidden;
  transition: all 0.2s ease;
}

.version-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 0 20px var(--neon-cyan-glow);
}

html:not(.dark) .version-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08), 0 0 0 1px rgba(8, 145, 178, 0.2);
}

/* Timeline dot */
.version-card::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 1.5rem;
  width: 0.75rem;
  height: 0.75rem;
  background-color: var(--bg-surface);
  border: 2px solid var(--neon-cyan);
  border-radius: 50%;
  transform: translateX(-50%);
  z-index: 1;
}

.version-card:hover::before {
  background-color: var(--neon-cyan);
  box-shadow: 0 0 10px var(--neon-cyan-glow);
}

.version-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.version-header:hover {
  background-color: var(--bg-elevated);
}

.version-header h2 {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  color: var(--text-primary);
}

.version-header:hover h2 {
  color: var(--neon-cyan);
}

.chevron {
  transition: transform 0.2s ease;
  color: var(--text-muted);
}

.chevron.rotate-180 {
  transform: rotate(180deg);
}

.version-body {
  border-top: 1px solid var(--border-default);
  overflow: hidden;
}

/* ---------------------------------------------------------------------------
   Category Badges - Neon Style
   --------------------------------------------------------------------------- */

.badge-added {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--neon-green);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-fixed {
  background-color: rgba(0, 217, 255, 0.15);
  color: var(--neon-cyan);
  border: 1px solid rgba(0, 217, 255, 0.3);
}

.badge-improved {
  background-color: rgba(123, 97, 255, 0.15);
  color: var(--neon-purple);
  border: 1px solid rgba(123, 97, 255, 0.3);
}

.badge-changed {
  background-color: rgba(245, 158, 11, 0.15);
  color: var(--neon-amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-removed {
  background-color: rgba(239, 68, 68, 0.15);
  color: var(--neon-red);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge-other {
  background-color: var(--bg-elevated);
  color: var(--text-muted);
  border: 1px solid var(--border-default);
}

/* Light mode badge enhancements */
html:not(.dark) .badge-added {
  background-color: rgba(5, 150, 105, 0.1);
  border-color: rgba(5, 150, 105, 0.3);
}

html:not(.dark) .badge-fixed {
  background-color: rgba(8, 145, 178, 0.1);
  border-color: rgba(8, 145, 178, 0.3);
}

html:not(.dark) .badge-improved {
  background-color: rgba(124, 58, 237, 0.1);
  border-color: rgba(124, 58, 237, 0.3);
}

html:not(.dark) .badge-changed {
  background-color: rgba(217, 119, 6, 0.1);
  border-color: rgba(217, 119, 6, 0.3);
}

html:not(.dark) .badge-removed {
  background-color: rgba(220, 38, 38, 0.1);
  border-color: rgba(220, 38, 38, 0.3);
}

.category-badge {
  padding: 0.25rem 0.5rem;
  border-radius: 0.375rem;
  font-size: 0.625rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ---------------------------------------------------------------------------
   Entry Items
   --------------------------------------------------------------------------- */

.entry-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  transition: background-color 0.15s ease;
}

.entry-item:hover {
  background-color: var(--bg-elevated);
}

.entry-text {
  color: var(--text-secondary);
  line-height: 1.6;
}

.entry-item:hover .entry-text {
  color: var(--text-primary);
}

.toggle-original {
  font-size: 0.75rem;
  color: var(--text-muted);
  opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease;
}

.entry-item:hover .toggle-original {
  opacity: 1;
}

.toggle-original:hover {
  color: var(--neon-cyan);
}

.original-text {
  color: var(--text-muted);
  font-style: italic;
}

/* ---------------------------------------------------------------------------
   Animations
   --------------------------------------------------------------------------- */

.fade-in {
  animation: fadeInUp 0.35s ease-out both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse-glow {
  0%, 100% {
    box-shadow: 0 0 5px var(--neon-cyan-glow);
  }
  50% {
    box-shadow: 0 0 20px var(--neon-cyan-glow);
  }
}

.animate-spin {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ---------------------------------------------------------------------------
   Search Input
   --------------------------------------------------------------------------- */

#searchInput {
  background-color: var(--bg-surface);
  border-color: var(--border-default);
  color: var(--text-primary);
}

#searchInput::placeholder {
  color: var(--text-muted);
}

#searchInput:focus {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 0 3px var(--neon-cyan-glow);
}

/* ---------------------------------------------------------------------------
   Back to Top Button
   --------------------------------------------------------------------------- */

#backToTop {
  background-color: var(--neon-cyan);
  color: var(--bg-primary);
  box-shadow: 0 4px 20px var(--neon-cyan-glow);
}

#backToTop:hover {
  box-shadow: 0 4px 30px rgba(0, 217, 255, 0.5);
  transform: translateY(-2px);
}

/* ---------------------------------------------------------------------------
   Focus Styles (Accessibility)
   --------------------------------------------------------------------------- */

:focus-visible {
  outline: 2px solid var(--neon-cyan);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------------------------------------------------------------------------
   Selection
   --------------------------------------------------------------------------- */

::selection {
  background-color: rgba(0, 217, 255, 0.3);
  color: inherit;
}

html:not(.dark) ::selection {
  background-color: rgba(8, 145, 178, 0.25);
}

/* ---------------------------------------------------------------------------
   Responsive Adjustments
   --------------------------------------------------------------------------- */

@media (max-width: 1024px) {
  .version-card {
    margin-left: 1.5rem;
  }

  .version-card::before {
    left: -1.5rem;
  }
}

@media (max-width: 640px) {
  .version-card {
    margin-left: 1rem;
    border-radius: 0.75rem;
  }

  .version-card::before {
    left: -1rem;
    width: 0.5rem;
    height: 0.5rem;
  }

  .version-header {
    padding: 0.875rem 1rem;
  }

  .entry-item {
    padding: 0.5rem 0.75rem;
  }

  .category-badge {
    font-size: 0.5rem;
    padding: 0.125rem 0.375rem;
  }
}

/* Touch devices - always show toggle */
@media (hover: none) {
  .toggle-original {
    opacity: 1 !important;
  }
}

/* ---------------------------------------------------------------------------
   Version TOC Navigation
   --------------------------------------------------------------------------- */

.version-toc-item {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.875rem;
  border-radius: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-muted);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-default);
  transition: all 0.15s ease;
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
}

.version-toc-item:hover {
  color: var(--neon-cyan);
  border-color: var(--neon-cyan);
  background-color: var(--neon-cyan-glow);
}

.version-card {
  scroll-margin-top: 12rem;
}

/* ---------------------------------------------------------------------------
   Print Styles
   --------------------------------------------------------------------------- */

@media print {
  #sidebar,
  #mobileMenuBtn,
  #backToTop,
  #themeToggle,
  #toggleAllBtn,
  .toggle-original,
  .filter-btn {
    display: none !important;
  }

  main {
    margin-left: 0 !important;
  }

  .version-card {
    break-inside: avoid;
    margin-left: 0;
    border: 1px solid #ccc !important;
    box-shadow: none !important;
  }

  .version-card::before {
    display: none;
  }

  .version-body {
    display: block !important;
  }

  body {
    background: white !important;
    color: black !important;
  }
}