/* Dark Mode Toggle - CSS Variables */
:root {
  /* Light mode (default) */
  --bg-color: #fff;
  --text-color: #333;
  --text-meta-color: #666;
  --link-color: #777;
  --link-unvisited-color: #666;
  --link-hover-color: #222;
  --link-visited-color: #777;
  --link-decoration-color: rgba(0, 0, 0, 0.2);
  --link-decoration-unvisited-color: rgba(0, 0, 0, 0.5);
  --link-decoration-hover-color: rgba(0, 0, 0, 0.4);
  --link-decoration-visited-color: rgba(0, 0, 0, 0.15);
  --code-border-color: #000;
  --code-label-color: #666;
  --code-label-bg: rgba(255, 255, 255, 0.9);
  --inline-code-bg: #f5f5f5;
  --emphasis-bg: rgba(255, 215, 0, 0.35);
  --emphasis-text-color: #8a4b00;
  --remark-bg: rgba(0, 0, 0, 0.04);
  --remark-border-color: rgba(0, 0, 0, 0.15);
  --remark-text-color: var(--text-color);
  --remark-inline-code-bg: rgba(0, 0, 0, 0.06);
  --tldr-bg: rgba(59, 130, 246, 0.08);
  --tldr-border-color: rgba(59, 130, 246, 0.3);
  --tldr-text-color: var(--text-color);
  --tldr-title-color: #2563eb;
  --tldr-inline-code-bg: rgba(59, 130, 246, 0.12);
  --table-header-bg: #f5f5f5;
  --table-border-color: rgba(0, 0, 0, 0.1);
  --table-row-hover-bg: #f9f9f9;
  --blockquote-border-color: #999;
  --blockquote-bg: #f5f5f5;
  --blockquote-text-color: #333;
  --toggle-button-bg: #f9f9f9;
  --toggle-button-border: #646cff;
  --font-size-active-bg: #333;
  --font-size-active-color: #fff;
  --switch-plate-bg: #f5f5f5;
  --switch-toggle-bg: #e0e0e0;
  --switch-shadow: rgba(0, 0, 0, 0.15);
  --image-shadow: 0 4px 20px rgba(0, 0, 0, 0.15), 0 2px 6px rgba(0, 0, 0, 0.1);
  --font-size-scale: 1.125;
}

/* Dark mode variables */
html:has(#dark-mode-toggle:checked) {
  color-scheme: dark;
  --bg-color: #1a1a1a;
  --text-color: #e0e0e0;
  --text-meta-color: #999;
  --link-color: #bbb;
  --link-unvisited-color: #f0f0f0;
  --link-hover-color: #e0e0e0;
  --link-visited-color: #999;
  --link-decoration-color: rgba(255, 255, 255, 0.2);
  --link-decoration-unvisited-color: rgba(255, 255, 255, 0.5);
  --link-decoration-hover-color: rgba(255, 255, 255, 0.4);
  --link-decoration-visited-color: rgba(255, 255, 255, 0.15);
  --code-border-color: #444;
  --code-label-color: #ccc;
  --code-label-bg: rgba(26, 26, 26, 0.9);
  --inline-code-bg: #4a4a4a;
  --emphasis-bg: rgba(255, 183, 0, 0.25);
  --emphasis-text-color: #ffd479;
  --remark-bg: rgba(255, 255, 255, 0.05);
  --remark-border-color: rgba(255, 255, 255, 0.18);
  --remark-text-color: var(--text-color);
  --remark-inline-code-bg: rgba(255, 255, 255, 0.08);
  --tldr-bg: rgba(96, 165, 250, 0.1);
  --tldr-border-color: rgba(96, 165, 250, 0.4);
  --tldr-text-color: var(--text-color);
  --tldr-title-color: #60a5fa;
  --tldr-inline-code-bg: rgba(96, 165, 250, 0.15);
  --table-header-bg: #2a2a2a;
  --table-border-color: rgba(255, 255, 255, 0.1);
  --table-row-hover-bg: #2a2a2a;
  --blockquote-border-color: #666;
  --blockquote-bg: #2a2a2a;
  --blockquote-text-color: #e0e0e0;
  --toggle-button-bg: #2a2a2a;
  --toggle-button-border: #4a9eff;
  --font-size-active-bg: rgba(255, 255, 255, 0.15);
  --font-size-active-color: #e0e0e0;
  --switch-plate-bg: #2a2a2a;
  --switch-toggle-bg: #3a3a3a;
  --switch-shadow: rgba(0, 0, 0, 0.3);
  --image-shadow: 0 16px 40px rgba(0, 0, 0, 0.65), 0 6px 20px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.05);
}

/* Dark mode toggle styles */
.dark-mode-toggle {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.dark-mode-label {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
  cursor: pointer;
  padding: 0.5rem;
  background: transparent;
}

/* Switch plate (outer frame) */
.switch-plate {
  position: relative;
  display: block;
  width: 2.5rem;
  height: 3.5rem;
  background-color: var(--switch-plate-bg);
  border-radius: 0.4rem;
  box-shadow: 
    0 3px 6px var(--switch-shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.4),
    inset 0 -1px 0 rgba(0, 0, 0, 0.1);
  padding: 0.35rem 0.3rem;
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.dark-mode-label:hover .switch-plate {
  box-shadow: 
    0 6px 12px var(--switch-shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.4),
    inset 0 -1px 0 rgba(0, 0, 0, 0.1);
}

/* Switch toggle (the moving part) */
.switch-toggle {
  position: absolute;
  left: 50%;
  top: 0.5rem;
  transform: translateX(-50%);
  width: 1.9rem;
  height: 1.2rem;
  background-color: var(--switch-toggle-bg);
  border-radius: 0.2rem;
  box-shadow: 
    0 2px 4px rgba(0, 0, 0, 0.2),
    inset 0 1px 2px rgba(255, 255, 255, 0.5),
    inset 0 -1px 1px rgba(0, 0, 0, 0.1);
  transition: top 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}

/* When checked, move toggle down (flip switch down) */
html:has(#dark-mode-toggle:checked) .switch-toggle {
  top: 1.8rem;
}


/* Responsive styles for toggle switch */
@media (max-width: 600px) {
  .dark-mode-label {
    top: 1rem;
    right: 1rem;
    padding: 0.375rem;
  }

  .switch-plate {
    width: 2.2rem;
    height: 3rem;
    padding: 0.3rem 0.25rem;
  }

  .switch-toggle {
    width: 1.7rem;
    height: 1rem;
    top: 0.45rem;
  }

  html:has(#dark-mode-toggle:checked) .switch-toggle {
    top: 1.55rem;
  }
}

/* Font size controls */
.font-size-controls {
  position: fixed;
  top: 1.5rem;
  left: 1.5rem;
  z-index: 1000;
  display: flex;
  gap: 0.25rem;
  background-color: var(--switch-plate-bg);
  padding: 0.35rem;
  border-radius: 0.4rem;
  box-shadow: 
    0 3px 6px var(--switch-shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.4),
    inset 0 -1px 0 rgba(0, 0, 0, 0.1);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.font-size-controls:hover {
  box-shadow: 
    0 6px 12px var(--switch-shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.4),
    inset 0 -1px 0 rgba(0, 0, 0, 0.1);
}

.font-size-btn {
  background-color: transparent;
  border: none;
  color: var(--text-color);
  font-weight: 600;
  padding: 0;
  cursor: pointer;
  border-radius: 0.2rem;
  transition: background-color 0.2s ease, color 0.2s ease;
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  text-align: center;
}

#font-size-medium {
  font-size: 0.75rem;
}

#font-size-large {
  font-size: 0.95rem;
}

#font-size-xl {
  font-size: 1.15rem;
}

.font-size-btn:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

html:has(#dark-mode-toggle:checked) .font-size-btn:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.font-size-btn.active {
  background-color: var(--font-size-active-bg);
  color: var(--font-size-active-color);
  box-shadow: 
    inset 0 1px 2px rgba(0, 0, 0, 0.1),
    0 1px 2px rgba(0, 0, 0, 0.1);
}

html:has(#dark-mode-toggle:checked) .font-size-btn.active {
  background-color: var(--font-size-active-bg);
  color: var(--font-size-active-color);
  box-shadow: 
    inset 0 1px 2px rgba(0, 0, 0, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.1);
}

/* Font size scaling */
html[data-font-size="medium"] {
  --font-size-scale: 1.0;
}

html:not([data-font-size]) {
  --font-size-scale: 1.2;
}

html[data-font-size="large"] {
  --font-size-scale: 1.2;
}

html[data-font-size="xl"] {
  --font-size-scale: 1.4;
}

/* Increase font sizes for 4K and high-resolution displays */
@media (min-width: 2560px) {
  html[data-font-size="medium"] {
    --font-size-scale: 1.25;
  }

  html:not([data-font-size]) {
    --font-size-scale: 1.5;
  }

  html[data-font-size="large"] {
    --font-size-scale: 1.5;
  }

  html[data-font-size="xl"] {
    --font-size-scale: 1.75;
  }
}

/* Responsive styles for font size controls */
@media (max-width: 600px) {
  .font-size-controls {
    top: 1rem;
    left: 1rem;
    padding: 0.3rem;
    gap: 0.2rem;
  }

  #font-size-medium {
    font-size: 0.65rem;
  }

  #font-size-large {
    font-size: 0.8rem;
  }

  #font-size-xl {
    font-size: 0.95rem;
  }

  .font-size-btn {
    width: 1.5rem;
    height: 1.5rem;
  }
}

/* Language selector */
.language-selector {
  position: fixed;
  top: 1.5rem;
  right: 5.5rem;
  z-index: 1000;
  padding: 0.5rem;
  background: transparent;
}

.language-selector-btn {
  background-color: var(--switch-plate-bg);
  border: none;
  color: var(--text-color);
  padding: 0.35rem 0.75rem;
  border-radius: 0.4rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  min-width: 7rem;
  box-shadow: 
    0 3px 6px var(--switch-shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.4),
    inset 0 -1px 0 rgba(0, 0, 0, 0.1);
  transition: background-color 0.3s ease, box-shadow 0.3s ease, color 0.3s ease;
  font-family: system-ui, -apple-system, sans-serif;
}

.language-selector-btn:hover {
  box-shadow: 
    0 6px 12px var(--switch-shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.4),
    inset 0 -1px 0 rgba(0, 0, 0, 0.1);
}

.language-selector-icon {
  font-size: 0.875rem;
  line-height: 1;
  font-weight: 600;
  font-family: system-ui, -apple-system, sans-serif;
  color: var(--text-color);
  opacity: 0.8;
}

.language-selector-text {
  font-size: 0.875rem;
  font-weight: 600;
  white-space: nowrap;
  text-align: center;
}

.language-dropdown {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  background-color: var(--switch-plate-bg);
  border-radius: 0.4rem;
  box-shadow: 
    0 6px 20px var(--switch-shadow),
    0 2px 8px rgba(0, 0, 0, 0.1);
  min-width: 150px;
  max-height: 300px;
  overflow-y: auto;
  display: none;
  flex-direction: column;
  padding: 0.25rem;
  margin: 0;
  list-style: none;
}

.language-dropdown.show {
  display: flex;
}

.language-option {
  background-color: transparent;
  border: none;
  color: var(--text-color);
  padding: 0.6rem 0.75rem;
  text-align: left;
  cursor: pointer;
  border-radius: 0.3rem;
  font-size: 0.875rem;
  font-family: system-ui, -apple-system, sans-serif;
  transition: background-color 0.2s ease, color 0.2s ease;
  width: 100%;
}

.language-option:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

html:has(#dark-mode-toggle:checked) .language-option:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.language-option.active {
  background-color: var(--font-size-active-bg);
  color: var(--font-size-active-color);
  font-weight: 600;
}

/* Responsive styles for language selector */
@media (max-width: 600px) {
  .language-selector {
    top: 1rem;
    right: 4rem;
    padding: 0.375rem;
  }

  .language-selector-btn {
    padding: 0.3rem 0.6rem;
    font-size: 0.8rem;
  }

  .language-selector-icon {
    font-size: 0.75rem;
  }

  .language-selector-text {
    font-size: 0.8rem;
  }

  .language-dropdown {
    min-width: 130px;
    max-height: 250px;
  }

  .language-option {
    padding: 0.5rem 0.6rem;
    font-size: 0.8rem;
  }
}