/* ==========================================================================
   components.css — Code blocks, search overlay, TOC, and other components
   ========================================================================== */

/* --------------------------------------------------------------------------
   Code Blocks (Prism.js Integration)
   Prism.js is loaded conditionally on single posts.
   These styles provide the base + override Prism defaults to match our theme.
   -------------------------------------------------------------------------- */
pre[class*="language-"],
code[class*="language-"] {
  font-family: var(--font-code);
  font-size: var(--fs-code);
  line-height: var(--lh-code);
  color: var(--code-text);
  text-align: left;
  white-space: pre;
  word-spacing: normal;
  word-break: normal;
  word-wrap: normal;
  tab-size: 2;
  hyphens: none;
}

pre[class*="language-"] {
  background-color: var(--code-bg);
  padding: var(--space-lg);
  margin: var(--space-lg) 0;
  border-radius: 8px;
  overflow-x: auto;
  position: relative;
}

/* Language label */
pre[class*="language-"]::before {
  content: attr(data-language);
  position: absolute;
  top: var(--space-sm);
  right: var(--space-md);
  font-size: var(--fs-xs);
  color: #6B7280;
  text-transform: uppercase;
  letter-spacing: var(--ls-uppercase);
  pointer-events: none;
}

/* Copy button (shown on hover) */
.code-copy-btn {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--fs-xs);
  color: #9CA3AF;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition-fast),
              color var(--transition-fast);
}

pre[class*="language-"]:hover .code-copy-btn {
  opacity: 1;
}

.code-copy-btn:hover {
  color: #FFFFFF;
  background: rgba(255, 255, 255, 0.15);
}

.code-copy-btn.copied {
  color: var(--sidebar-accent);
}

/* --------------------------------------------------------------------------
   Search (placeholder — full implementation in Phase 3c)
   -------------------------------------------------------------------------- */
.search-form {
  display: flex;
  gap: var(--space-sm);
}

.search-form input[type="search"] {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--fs-small);
  color: var(--text-primary);
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  outline: none;
  transition: border-color var(--transition-fast),
              background-color var(--transition-base);
}

.search-form input[type="search"]:focus {
  border-color: var(--accent);
}

.search-form input[type="search"]::placeholder {
  color: var(--text-secondary);
}

.search-form button[type="submit"] {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--fs-small);
  color: #FFFFFF;
  background-color: var(--accent);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.search-form button[type="submit"]:hover {
  background-color: var(--accent-hover);
}

/* --------------------------------------------------------------------------
   Skip Link (accessibility)
   -------------------------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  z-index: 999;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--fs-small);
  color: #FFFFFF;
  background-color: var(--accent);
  border-radius: 0 0 6px 6px;
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

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

.screen-reader-text:focus {
  position: static;
  width: auto;
  height: auto;
  padding: var(--space-sm) var(--space-md);
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
  background-color: var(--surface);
  font-size: var(--fs-small);
}

/* --------------------------------------------------------------------------
   Mobile TOC (collapsible, shown on single posts < 960px)
   -------------------------------------------------------------------------- */
.mobile-toc {
  display: none; /* Hidden by default — shown by JS when headings exist */
  margin-bottom: var(--space-xl);
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: border-color var(--transition-base);
}

.mobile-toc.is-visible {
  display: block;
}

/* Only show mobile TOC below desktop breakpoint */
@media (min-width: 960px) {
  .mobile-toc {
    display: none !important;
  }
}

.mobile-toc-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  background: var(--surface);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: color var(--transition-fast),
              background-color var(--transition-base);
}

.mobile-toc-toggle:hover {
  color: var(--text-primary);
}

.mobile-toc-icon {
  transition: transform var(--transition-base);
}

.mobile-toc-label {
  text-transform: uppercase;
  letter-spacing: var(--ls-uppercase);
  font-size: var(--fs-xs);
}

.mobile-toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.mobile-toc-list.is-open {
  max-height: 500px;
  padding: var(--space-sm) var(--space-md) var(--space-md);
}

.mobile-toc-list li {
  margin-bottom: 2px;
}

.mobile-toc-list a {
  display: block;
  padding: 4px 0;
  font-size: var(--fs-toc);
  color: var(--text-secondary);
  text-decoration: none;
  line-height: 1.4;
  transition: color var(--transition-fast);
}

.mobile-toc-list a:hover,
.mobile-toc-list a.is-active {
  color: var(--accent);
}

.mobile-toc-list .toc-h3 {
  padding-left: var(--space-md);
}

/* --------------------------------------------------------------------------
   Search Header (search results page)
   -------------------------------------------------------------------------- */
.search-header {
  margin-bottom: var(--space-2xl);
}

.search-title span {
  color: var(--accent);
}

.search-header-form {
  margin-top: var(--space-lg);
}

/* --------------------------------------------------------------------------
   No Results / 404
   -------------------------------------------------------------------------- */
.no-results,
.error-404 {
  text-align: center;
  padding: var(--space-3xl) 0;
}

.no-results .page-title,
.error-404 .page-title {
  margin-bottom: var(--space-lg);
}

.no-results p,
.error-404 p {
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.no-results-form,
.error-404-search {
  max-width: 400px;
  margin: 0 auto var(--space-xl);
}

.no-results-home a,
.error-404-home a {
  color: var(--accent);
  text-decoration: none;
  font-size: var(--fs-small);
}

.no-results-home a:hover,
.error-404-home a:hover {
  color: var(--accent-hover);
}

/* --------------------------------------------------------------------------
   Custom Scrollbar (content area)
   -------------------------------------------------------------------------- */
body::-webkit-scrollbar {
  width: 8px;
}

body::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

body::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 4px;
}

body::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}