/**
 * Dark Mode Styles
 * Theme switching between light and dark modes
 */

/* Dark Mode Control UI */
.dark-mode-control {
  display: flex;
  gap: 0.25rem;
  align-items: center;
  background: rgba(255, 255, 255, 0.1);
  padding: 0.25rem;
  border-radius: 6px;
  backdrop-filter: blur(10px);
}

.theme-btn {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: white;
  padding: 0.375rem 0.625rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1.125rem;
  transition: all var(--transition-fast);
  min-width: 40px;
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}

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

.theme-btn.active {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.4);
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.1);
}

.theme-btn:focus {
  outline: 2px solid white;
  outline-offset: 2px;
}

/* Dark Theme Variables */
html[data-theme="dark"] {
  /* Colors */
  --color-primary: #1a2332;
  --color-secondary: #243447;
  --color-accent: #4a9eff;
  --color-accent-dark: #3a8eef;
  --color-text: #e4e4e7;
  --color-text-light: #a1a1aa;
  --color-background: #0f172a;
  --color-background-alt: #1e293b;
  --color-border: #334155;
  --color-success: #34d399;
  --color-warning: #fbbf24;
  --color-error: #f87171;

  /* Shadows for dark mode */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.6);
}

/* Dark Theme Specific Adjustments */
html[data-theme="dark"] body {
  color: var(--color-text);
  background-color: var(--color-background);
}

/* Header in dark mode */
html[data-theme="dark"] .reader-header {
  background-color: var(--color-primary);
  border-bottom: 1px solid var(--color-border);
}

/* Sidebar in dark mode */
html[data-theme="dark"] .sidebar {
  background-color: var(--color-background-alt);
  border-right: 1px solid var(--color-border);
}

html[data-theme="dark"] .sidebar-header {
  border-bottom: 1px solid var(--color-border);
}

/* Chapter menu in dark mode */
html[data-theme="dark"] .chapter-link {
  color: var(--color-text);
  border-left: 3px solid transparent;
}

html[data-theme="dark"] .chapter-link:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--color-accent);
}

html[data-theme="dark"] .chapter-link.active {
  background-color: rgba(74, 158, 255, 0.1);
  border-left-color: var(--color-accent);
  color: var(--color-accent);
}

/* Navigation buttons in dark mode */
html[data-theme="dark"] .nav-btn {
  background-color: var(--color-secondary);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

html[data-theme="dark"] .nav-btn:hover:not(:disabled) {
  background-color: var(--color-primary);
  border-color: var(--color-accent);
}

html[data-theme="dark"] .nav-btn:disabled {
  opacity: 0.3;
}

/* Menu toggle button */
html[data-theme="dark"] .menu-toggle {
  background-color: rgba(255, 255, 255, 0.1);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

html[data-theme="dark"] .menu-toggle:hover {
  background-color: rgba(255, 255, 255, 0.15);
}

/* Content area in dark mode */
html[data-theme="dark"] .reader-content {
  background-color: var(--color-background);
}

html[data-theme="dark"] #chapter-content {
  color: var(--color-text);
}

/* Typography adjustments for dark mode */
html[data-theme="dark"] #chapter-content h1,
html[data-theme="dark"] #chapter-content h2,
html[data-theme="dark"] #chapter-content h3,
html[data-theme="dark"] #chapter-content h4,
html[data-theme="dark"] #chapter-content h5,
html[data-theme="dark"] #chapter-content h6 {
  color: var(--color-text);
}

html[data-theme="dark"] #chapter-content p {
  color: var(--color-text);
}

/* Fix drop cap (first letter) in dark mode */
html[data-theme="dark"] .reading-content p:first-of-type::first-letter,
html[data-theme="dark"] .chapter-body p:first-of-type::first-letter {
  color: var(--color-accent);
}

html[data-theme="dark"] #chapter-content em {
  color: var(--color-accent);
}

html[data-theme="dark"] #chapter-content hr {
  border-color: var(--color-border);
  opacity: 0.3;
}

/* Loading indicator in dark mode */
html[data-theme="dark"] .loading-indicator {
  color: var(--color-text-light);
}

html[data-theme="dark"] .loading-spinner {
  border-color: var(--color-border);
  border-top-color: var(--color-accent);
}

/* Error container in dark mode */
html[data-theme="dark"] .error-container {
  background-color: rgba(248, 113, 113, 0.1);
  border-color: var(--color-error);
  color: var(--color-text);
}

/* Font size control in dark mode */
html[data-theme="dark"] .font-size-btn {
  background: rgba(255, 255, 255, 0.05);
  color: white;
  border-color: rgba(255, 255, 255, 0.2);
}

html[data-theme="dark"] .font-size-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
}

html[data-theme="dark"] .font-size-btn.active {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.4);
}

/* Links in dark mode */
html[data-theme="dark"] a {
  color: var(--color-accent);
}

html[data-theme="dark"] a:hover {
  color: var(--color-accent-dark);
}

/* Cards and containers in dark mode */
html[data-theme="dark"] .card,
html[data-theme="dark"] .container-alt {
  background-color: var(--color-background-alt);
  border-color: var(--color-border);
}

/* Buttons in dark mode */
html[data-theme="dark"] .btn-primary {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
}

html[data-theme="dark"] .btn-primary:hover {
  background-color: var(--color-accent-dark);
}

html[data-theme="dark"] .btn-secondary {
  background-color: var(--color-secondary);
  color: var(--color-text);
  border-color: var(--color-border);
}

html[data-theme="dark"] .btn-secondary:hover {
  background-color: var(--color-primary);
}

/* Reduce eye strain with slightly less pure colors */
html[data-theme="dark"] #chapter-content {
  /* Slightly reduce brightness for long reading sessions */
  filter: brightness(0.95);
}

/* Smooth transitions when switching themes */
html,
body,
.reader-header,
.sidebar,
.reader-content,
#chapter-content,
.chapter-link,
.nav-btn,
.font-size-btn,
.theme-btn {
  transition: background-color var(--transition-base),
              color var(--transition-base),
              border-color var(--transition-base);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .dark-mode-control {
    gap: 0.125rem;
    padding: 0.25rem;
  }
  
  .theme-btn {
    padding: 0.3rem 0.5rem;
    font-size: 1rem;
    min-width: 36px;
    min-height: 36px;
  }
}

@media (max-width: 480px) {
  .theme-btn {
    padding: 0.25rem 0.375rem;
    font-size: 0.95rem;
    min-width: 34px;
    min-height: 34px;
  }
}

/* Print styles - always use light theme for printing */
@media print {
  .dark-mode-control {
    display: none;
  }
  
  html[data-theme="dark"] {
    /* Force light theme colors for printing */
    --color-text: #333333;
    --color-background: #ffffff;
    --color-background-alt: #f8f9fa;
  }
  
  html[data-theme="dark"] #chapter-content {
    filter: none;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  html[data-theme="dark"] {
    --color-text: #ffffff;
    --color-background: #000000;
    --color-border: #666666;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  html,
  body,
  .reader-header,
  .sidebar,
  .reader-content,
  #chapter-content,
  .chapter-link,
  .nav-btn,
  .font-size-btn,
  .theme-btn {
    transition: none;
  }
}

/* Screen reader only content */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}