:root {
  --theme-body-bg: #ffffff;
  --theme-body-color: #212529;
  --theme-link-color: #0085A1;
  --theme-link-hover: #005f73;
  --theme-muted-color: #6c757d;
  --theme-surface: #ffffff;
  --theme-border-color: rgba(0, 0, 0, 0.125);
  --theme-nav-bg: rgba(255, 255, 255, 0.95);
  --theme-nav-border: rgba(0, 0, 0, 0.1);
  --theme-footer-bg: #ffffff;
}

html[data-theme="white"] {
  color-scheme: light;
}

html[data-theme="black"] {
  color-scheme: dark;
  --theme-body-bg: #050505;
  --theme-body-color: #f8f9fa;
  --theme-link-color: #4EC9B0;
  --theme-link-hover: #82E9FF;
  --theme-muted-color: #cfd2dc;
  --theme-surface: #111217;
  --theme-border-color: rgba(255, 255, 255, 0.2);
  --theme-nav-bg: rgba(5, 5, 5, 0.95);
  --theme-nav-border: rgba(255, 255, 255, 0.15);
  --theme-footer-bg: #0b0c10;
}

body {
  background-color: var(--theme-body-bg) !important;
  color: var(--theme-body-color) !important;
}

a {
  color: var(--theme-link-color);
}

a:hover,
a:focus {
  color: var(--theme-link-hover);
}

.post-preview {
  color: var(--theme-body-color);
}

.post-preview .post-meta,
.post-preview .post-subtitle {
  color: var(--theme-muted-color);
}

.border-top,
hr {
  border-color: var(--theme-border-color) !important;
  color: var(--theme-border-color) !important;
}

#mainNav {
  background-color: var(--theme-nav-bg);
  border-bottom: 1px solid var(--theme-nav-border);
}

#mainNav .navbar-nav .nav-link {
  color: var(--theme-body-color);
}

#mainNav .navbar-nav .nav-link:hover,
#mainNav .navbar-nav .nav-link:focus {
  color: var(--theme-link-hover);
}

#mainNav .navbar-brand {
  color: var(--theme-body-color);
}

#mainNav .navbar-brand:hover,
#mainNav .navbar-brand:focus {
  color: var(--theme-link-hover);
}

@media (min-width: 992px) {
  #mainNav {
    background: transparent;
    border-bottom-color: transparent;
  }

  #mainNav.is-fixed {
    background-color: var(--theme-nav-bg);
    border-bottom-color: var(--theme-nav-border);
  }

  html[data-theme="black"] #mainNav .navbar-brand,
  html[data-theme="black"] #mainNav .navbar-nav .nav-link {
    color: #ffffff;
  }

  html[data-theme="black"] #mainNav .navbar-nav .nav-link:hover,
  html[data-theme="black"] #mainNav .navbar-nav .nav-link:focus,
  html[data-theme="black"] #mainNav .navbar-brand:hover,
  html[data-theme="black"] #mainNav .navbar-brand:focus {
    color: rgba(255, 255, 255, 0.8);
  }

  #mainNav.is-fixed .navbar-brand,
  #mainNav.is-fixed .navbar-nav .nav-link {
    color: var(--theme-body-color);
  }
}

.theme-select-wrapper {
  display: flex;
  align-items: center;
  padding: 0.5rem 0;
}

.theme-select-control {
  border-radius: 999px;
  border: 1px solid var(--theme-border-color);
  background-color: var(--theme-surface);
  color: var(--theme-body-color);
  font-size: 0.75rem;
  text-transform: uppercase;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
}

.theme-select-control:focus {
  outline: none;
  border-color: var(--theme-link-color);
  box-shadow: 0 0 0 0.15rem rgba(0, 133, 161, 0.25);
}

@media (min-width: 992px) {
  .theme-select-wrapper {
    padding: 0;
    margin-left: 1rem;
  }
}

html[data-theme="black"] footer {
  background-color: var(--theme-footer-bg);
  color: var(--theme-body-color);
}

html[data-theme="black"] .post-preview {
  background-color: var(--theme-surface);
  border-radius: 0.5rem;
  padding: 1.5rem;
  box-shadow: 0 0 0.5rem rgba(0, 0, 0, 0.35);
}

html[data-theme="white"] .post-preview {
  background-color: transparent;
  box-shadow: none;
  padding: 0;
}

html[data-theme="black"] .post-preview h2.post-title,
html[data-theme="black"] .post-preview h3.post-subtitle {
  color: #ffffff;
  text-shadow: 0 0 8px rgba(0, 0, 0, 0.35);
}

.article-content-row .toc-panel {
  position: sticky;
  top: 120px;
  border-radius: 0.5rem;
  border: 1px solid var(--theme-border-color);
  background-color: var(--theme-surface);
  padding: 0.75rem 1rem;
  box-shadow: 0 0 0.75rem rgba(0, 0, 0, 0.08);
}

.article-content-row .toc-panel summary {
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
}

.toc-content {
  max-height: 70vh;
  overflow-y: auto;
  padding-right: 0.5rem;
}

.toc-content ul {
  padding-left: 1rem;
  margin-bottom: 0;
}

.toc-content a {
  display: block;
  padding: 0.2rem 0.1rem;
  color: var(--theme-link-color);
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease;
}

.toc-content a:hover {
  color: var(--theme-link-hover);
}

.toc-content a.is-active {
  color: var(--theme-link-hover);
  font-weight: 700;
  transform: translateX(4px);
}

.article-body {
  color: var(--theme-body-color);
}

@media (max-width: 991.98px) {
  .article-content-row .toc-panel {
    position: relative;
    top: auto;
    max-height: none;
  }
}

html[data-theme="black"] .masthead .site-heading h1,
html[data-theme="black"] .masthead .post-heading h1,
html[data-theme="black"] .masthead .site-heading .subheading,
html[data-theme="black"] .masthead .post-heading .meta,
html[data-theme="black"] .masthead .post-heading h2,
html[data-theme="black"] .masthead .post-heading h3 {
  color: #ffffff;
  text-shadow: 0 0 12px rgba(0, 0, 0, 0.65);
}