:root {
  --bg-primary: #f8f9fa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f3f5;
  --bg-dropzone-hover: rgba(233, 236, 239, 0.7);
  --text-primary: #212529;
  --text-secondary: #495057;
  --text-tertiary: #adb5bd;
  --text-heading: #000000;
  --border-primary: #dee2e6;
  --border-dropzone: #ced4da;
  --loader-bg: #e9ecef;
  --link-text: #495057;
  --link-separator: #6c757d;
  --text-on-accent-light: #ffffff;
  --text-on-accent-dark: #e4e6eb;

  --blue-light: #0d6efd;
  --blue-light-hover: #0b5ed7;
  --blue-dark: #4dabf7;
  --blue-dark-hover: #3c9af5;
  --blue-bg-subtle-light: #cfe2ff;
  --blue-bg-subtle-dark: #1a3a5f;

  --red-light: #dc3545;
  --red-light-hover: #bb2d3b;
  --red-dark: #f87171;
  --red-dark-hover: #ef4444;
  --red-bg-subtle-light: #f8d7da;
  --red-bg-subtle-dark: #5c2a2e;
  --accent-active: var(--red-light);
  --accent-active-hover: var(--red-light-hover);
  --accent-active-bg-subtle: var(--red-bg-subtle-light);
  --accent-active-text: var(--text-on-accent-light);

  --border-dropzone-hover: var(--accent-active);
  --loader-spin: var(--accent-active);

  --preview-bg-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Crect width='8' height='8' fill='%23f1f3f5'/%3E%3Crect x='8' y='8' width='8' height='8' fill='%23f1f3f5'/%3E%3Crect x='8' width='8' height='8' fill='%23e9ecef'/%3E%3Crect y='8' width='8' height='8' fill='%23e9ecef'/%3E%3C/svg%3E");
  --preview-bg-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Crect width='8' height='8' fill='%23343a40'/%3E%3Crect x='8' y='8' width='8' height='8' fill='%23343a40'/%3E%3Crect x='8' width='8' height='8' fill='%23495057'/%3E%3Crect y='8' width='8' height='8' fill='%23495057'/%3E%3C/svg%3E");
}

html.dark {
  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --bg-tertiary: #2c2c2c;
  --bg-dropzone-hover: rgba(44, 44, 44, 0.7);
  --text-primary: #e4e6eb;
  --text-secondary: #b0b3b8;
  --text-tertiary: #8a8d91;
  --text-heading: #ffffff;
  --border-primary: #3a3b3c;
  --border-dropzone: #4e4f50;
  --loader-bg: #3a3b3c;
  --link-text: #b0b3b8;
  --link-separator: #8a8d91;

  --accent-active: var(--red-dark);
  --accent-active-hover: var(--red-dark-hover);
  --accent-active-bg-subtle: var(--red-bg-subtle-dark);
  --accent-active-text: var(--text-primary);

  --border-dropzone-hover: var(--accent-active);
  --loader-spin: var(--accent-active);
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.3s ease-in-out, color 0.3s ease-in-out;
}

.main-content-padding {
  padding-bottom: 80px;
}

.bg-primary {
  background-color: var(--bg-primary);
}
.bg-secondary {
  background-color: var(--bg-secondary);
}
.bg-tertiary {
  background-color: var(--bg-tertiary);
}
.text-primary {
  color: var(--text-primary);
}
.text-secondary {
  color: var(--text-secondary);
}
.text-tertiary {
  color: var(--text-tertiary);
}
.text-heading {
  color: var(--text-heading);
}
.border-primary {
  border-color: var(--border-primary);
}

.drop-zone {
  border: 2px dashed var(--border-dropzone);
  transition: all 0.3s ease;
}

.drop-zone:hover,
.drop-zone.active {
  border-color: var(--border-dropzone-hover);
  background-color: var(--bg-dropzone-hover);
}

.loader {
  border-color: var(--loader-bg);
  border-top-color: var(--loader-spin);
  animation: spinner 0.8s linear infinite;
}

@keyframes spinner {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.footer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 12px 0;
  text-align: center;
  z-index: 10;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-primary);
  transition: background-color 0.3s ease-in-out, border-color 0.3s ease-in-out;
}

.footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 16px;
}

.footer-link,
.footer-text {
  color: var(--link-text);
  text-decoration: none;
  opacity: 0.7;
  transition: opacity 0.2s, color 0.3s ease-in-out;
}

.footer-link:hover,
.footer-version:hover {
  opacity: 1;
}

.footer-separator {
  color: var(--link-separator);
  opacity: 0.6;
  font-size: 0.8rem;
  transition: color 0.3s ease-in-out;
}

.footer-github-icon {
  font-size: 0.85rem;
  margin-left: 4px;
  vertical-align: middle;
  position: relative;
  top: -1px;
}

.theme-toggle-container {
  position: fixed;
  top: 0.75rem;
  right: 0.75rem;
  z-index: 50;
}

.theme-toggle-button {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  color: var(--text-secondary);
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 0.375rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s, color 0.2s, border-color 0.2s;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
}

.theme-toggle-button:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.theme-toggle-button i {
  font-size: 1.1rem;
}

.preview-bg {
  background-image: var(--preview-bg-light);
  background-size: 16px 16px;
  transition: background-image 0.3s ease-in-out;
}

html.dark .preview-bg {
  background-image: var(--preview-bg-dark);
}

@media (max-width: 640px) {
  .main-content-padding {
    padding-bottom: 70px; /* Example: slightly smaller padding if footer is shorter */
  }
  .footer-links {
    gap: 6px;
  }
  .footer-separator {
    font-size: 0.7rem;
  }
  .theme-toggle-container {
    top: 0.5rem;
    right: 0.5rem;
  }
  .theme-toggle-button {
    width: 2.25rem;
    height: 2.25rem;
  }
  .theme-toggle-button i {
    font-size: 1rem;
  }
}

html.dark .prose {
  color: var(--text-secondary);
}

html.dark .prose h1,
html.dark .prose h2,
html.dark .prose h3 {
  color: var(--text-heading);
}

html.dark .prose strong {
  color: var(--text-primary);
}

html.dark .prose a {
  color: var(--loader-spin);
}

html.dark .prose ol > li::marker {
  color: var(--text-tertiary);
}

.text-accent-active {
  color: var(--accent-active);
  transition: color 0.3s ease-in-out;
}

.bg-accent-active-subtle {
  background-color: var(--accent-active-bg-subtle);
  transition: background-color 0.3s ease-in-out;
}

.button-accent {
  background-color: var(--accent-active);
  color: var(--accent-active-text) !important;
  transition: background-color 0.2s ease-in-out, color 0.3s ease-in-out;
}

.button-accent:hover {
  background-color: var(--accent-active-hover);
}