/* ─── CSS Custom Properties ─────────────────────────────────────────────── */
/* Dark mode (default — html.dark is set) */
.dark {
  --prose-body:        #d1d5db;
  --prose-heading:     #f9fafb;
  --prose-lead:        #9ca3af;
  --prose-link:        #2dd4bf;
  --prose-link-hover:  #99f6e4;
  --prose-bold:        #f3f4f6;
  --prose-code-bg:     #1f2937;
  --prose-code-text:   #e2e8f0;
  --prose-pre-bg:      #111827;
  --prose-border:      #374151;
  --prose-quote-bg:    #111827;
  --prose-quote-bar:   #2dd4bf;
  --prose-th-bg:       #1f2937;
  --prose-td-border:   #374151;
  --tag-bg:            rgba(45, 212, 191, 0.12);
  --tag-text:          #2dd4bf;
  --tag-border:        rgba(45, 212, 191, 0.25);
  --sidebar-active-bg: rgba(45, 212, 191, 0.1);
  --sidebar-active-text: #2dd4bf;
}

/* Light mode */
html:not(.dark) {
  --prose-body:        #374151;
  --prose-heading:     #111827;
  --prose-lead:        #6b7280;
  --prose-link:        #0d9488;
  --prose-link-hover:  #0f766e;
  --prose-bold:        #111827;
  --prose-code-bg:     #f1f5f9;
  --prose-code-text:   #1e293b;
  --prose-pre-bg:      #f8fafc;
  --prose-border:      #e2e8f0;
  --prose-quote-bg:    #f8fafc;
  --prose-quote-bar:   #0d9488;
  --prose-th-bg:       #f1f5f9;
  --prose-td-border:   #e2e8f0;
  --tag-bg:            rgba(13, 148, 136, 0.08);
  --tag-text:          #0d9488;
  --tag-border:        rgba(13, 148, 136, 0.2);
  --sidebar-active-bg: rgba(13, 148, 136, 0.08);
  --sidebar-active-text: #0d9488;
}

/* ─── Global ─────────────────────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

/* ─── Sidebar scrollbar ──────────────────────────────────────────────────── */
.sidebar-scroll::-webkit-scrollbar {
  width: 4px;
}
.sidebar-scroll::-webkit-scrollbar-track {
  background: transparent;
}
.sidebar-scroll::-webkit-scrollbar-thumb {
  background: rgba(107, 114, 128, 0.3);
  border-radius: 9999px;
}
.sidebar-scroll::-webkit-scrollbar-thumb:hover {
  background: rgba(107, 114, 128, 0.5);
}

/* ─── Sidebar nav links ──────────────────────────────────────────────────── */
.sidebar-link {
  display: block;
  padding: 0.375rem 0.75rem;
  border-radius: 0.5rem;
  font-size: 0.8125rem;
  line-height: 1.4;
  color: #6b7280;
  transition: background-color 0.15s, color 0.15s;
  text-decoration: none;
  border: 1px solid transparent;
}
.sidebar-link:hover {
  color: #111827;
  background-color: #f3f4f6;
}
.dark .sidebar-link:hover {
  color: #f9fafb;
  background-color: #1f2937;
}
.sidebar-link.active {
  background-color: var(--sidebar-active-bg);
  color: var(--sidebar-active-text);
  border-color: var(--tag-border);
  font-weight: 500;
}

/* ─── Tags / badges ──────────────────────────────────────────────────────── */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  background-color: var(--tag-bg);
  color: var(--tag-text);
  border: 1px solid var(--tag-border);
  text-transform: lowercase;
}

/* ─── Concept cards ──────────────────────────────────────────────────────── */
.concept-card {
  text-decoration: none;
  display: block;
}

/* ─── Prose / article typography ─────────────────────────────────────────── */
.prose {
  color: var(--prose-body);
  font-size: 0.9375rem;
  line-height: 1.75;
  max-width: 65ch;
}

.prose p {
  margin-top: 0;
  margin-bottom: 1.1em;
}

.prose h1, .prose h2, .prose h3, .prose h4 {
  color: var(--prose-heading);
  font-weight: 600;
  line-height: 1.35;
  margin-top: 1.75em;
  margin-bottom: 0.6em;
}
.prose h1 { font-size: 1.6rem; margin-top: 0; }
.prose h2 {
  font-size: 1.25rem;
  padding-bottom: 0.4em;
  border-bottom: 1px solid var(--prose-border);
}
.prose h3 { font-size: 1.05rem; }
.prose h4 { font-size: 0.95rem; }

.prose a {
  color: var(--prose-link);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
  transition: color 0.15s;
}
.prose a:hover {
  color: var(--prose-link-hover);
}

.prose strong {
  color: var(--prose-bold);
  font-weight: 600;
}

.prose em {
  font-style: italic;
}

/* Inline code */
.prose :not(pre) > code {
  background-color: var(--prose-code-bg);
  color: var(--prose-code-text);
  padding: 0.15em 0.45em;
  border-radius: 0.3em;
  font-size: 0.84em;
  font-family: ui-monospace, 'Cascadia Code', 'Fira Code', Consolas, monospace;
  font-weight: 400;
}

/* Code blocks */
.prose pre {
  background-color: var(--prose-pre-bg);
  border: 1px solid var(--prose-border);
  border-radius: 0.6rem;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1.25em 0;
  font-size: 0.85em;
  line-height: 1.6;
}
.prose pre code {
  background: none;
  padding: 0;
  font-size: 1em;
  color: var(--prose-code-text);
  font-family: ui-monospace, 'Cascadia Code', 'Fira Code', Consolas, monospace;
}

/* Blockquotes */
.prose blockquote {
  background-color: var(--prose-quote-bg);
  border-left: 3px solid var(--prose-quote-bar);
  padding: 0.75em 1.1em;
  margin: 1.25em 0;
  border-radius: 0 0.4rem 0.4rem 0;
  font-style: italic;
  color: var(--prose-lead);
}
.prose blockquote p {
  margin: 0;
}

/* Lists */
.prose ul {
  list-style-type: disc;
  padding-left: 1.5em;
  margin: 0.75em 0 1.1em;
}
.prose ol {
  list-style-type: decimal;
  padding-left: 1.5em;
  margin: 0.75em 0 1.1em;
}
.prose li {
  margin-bottom: 0.3em;
}
.prose li > ul,
.prose li > ol {
  margin: 0.3em 0 0.3em;
}

/* Tables */
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875em;
  margin: 1.25em 0;
}
.prose th {
  background-color: var(--prose-th-bg);
  color: var(--prose-heading);
  font-weight: 600;
  text-align: left;
  padding: 0.5em 0.75em;
  border: 1px solid var(--prose-td-border);
}
.prose td {
  padding: 0.45em 0.75em;
  border: 1px solid var(--prose-td-border);
}
.prose tr:nth-child(even) td {
  background-color: var(--prose-quote-bg);
}

/* Horizontal rules */
.prose hr {
  border: none;
  border-top: 1px solid var(--prose-border);
  margin: 2em 0;
}

/* Images */
.prose img {
  max-width: 100%;
  border-radius: 0.5rem;
  margin: 1em 0;
}

/* ─── Wikilinks ──────────────────────────────────────────────────────────── */
.wikilink {
  color: var(--prose-link);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
  text-decoration-style: dashed;
  transition: color 0.15s;
  cursor: pointer;
}
.wikilink:hover {
  color: var(--prose-link-hover);
  text-decoration-style: solid;
}
.wikilink-missing {
  color: #ef4444;
  text-decoration-color: #ef4444;
}
.dark .wikilink-missing {
  color: #f87171;
}

/* ─── Smooth page transitions ─────────────────────────────────────────────── */
#content-area {
  animation: fadeIn 0.15s ease-in-out;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── Hero accent line ───────────────────────────────────────────────────── */
.hero-accent {
  height: 3px;
  width: 2.5rem;
  background: linear-gradient(90deg, #2dd4bf, #0ea5e9);
  border-radius: 9999px;
  margin-bottom: 1.5rem;
}

/* ─── Responsive helpers ─────────────────────────────────────────────────── */
@media (max-width: 1023px) {
  #sidebar {
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.25);
  }
}