/* ========================================================================
   Phase 4 Step 3 — Sources block redesign

   Enhances the cai-sources plugin's existing markup. The plugin emits its
   own inline CSS via wp_head priority 25; this file overrides where the
   redesign needs different visuals (loaded after the inline CSS by virtue
   of being a regular stylesheet enqueued at wp_enqueue_scripts priority 25,
   which fires later in the head).
   ======================================================================== */

/* --- Outer block — warm-paper editorial slab --- */
.cai-sources {
  background: var(--cai-bg-tint);
  border: 1px solid var(--cai-card-border);
  border-radius: var(--cai-radius-lg);
  padding: var(--cai-space-2xl) var(--cai-space-xl);
  margin: var(--cai-space-3xl) 0 var(--cai-space-2xl);
}

/* --- Header — eyebrow-style label + count chip --- */
.cai-sources__header {
  margin-bottom: var(--cai-space-lg);
  padding-bottom: var(--cai-space-md);
  border-bottom: 1px solid var(--cai-card-border);
}
.cai-sources__heading-wrap {
  display: flex;
  align-items: baseline;
  gap: var(--cai-space-md);
  flex-wrap: wrap;
}
.cai-sources__heading {
  font-family: var(--cai-font-serif);             /* serif per directive A */
  font-size: 1.55rem;
  font-weight: 500;
  letter-spacing: -0.012em;
  margin: 0;
  color: var(--cai-text-strong);
}
.cai-sources__icon {
  display: inline-flex;
  align-items: center;
  color: var(--cai-primary-dark);
}
.cai-sources__count {
  display: inline-flex;
  align-items: center;
  padding: 0.18rem 0.6rem;
  font-family: var(--cai-font-sans);
  font-size: var(--cai-eyebrow-sm-size);
  font-weight: var(--cai-eyebrow-weight);
  letter-spacing: var(--cai-eyebrow-spacing);
  text-transform: uppercase;
  color: var(--cai-badge-text);
  background: var(--cai-badge-bg);
  border: 1px solid var(--cai-badge-border);
  border-radius: var(--cai-radius-pill);
}
.cai-sources__sub {
  font-size: 0.9rem;
  color: var(--cai-text-secondary);
  margin: var(--cai-space-md) 0 0;
}

/* --- Source list — flat ordered list, mono numbering, single column --- */
.cai-sources__list {
  list-style: none !important;
  margin: 0 !important;
  padding: 0 !important;
  /* Force single column — overrides plugin's inline 2-col grid
     at cai-sources.php:480 (repeat(auto-fill, minmax(300px, 1fr))).
     Single column matches Wikipedia/Nature/academic citation convention. */
  display: block !important;
  grid-template-columns: 1fr !important;
}
.cai-sources__item {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: var(--cai-space-md);
  padding: var(--cai-space-lg) 0 !important;
  border-top: 1px solid var(--cai-card-border) !important;
  border-bottom: none !important;
  position: relative;          /* for absolute-positioned cite button */
  scroll-margin-top: calc(var(--cai-sticky-top) + var(--cai-space-md));
}
.cai-sources__item:first-child {
  border-top: none !important;
  padding-top: 0 !important;
}
/* Source number — uses the plugin's inline <span>N</span> as the single
   source of truth for numbering. No CSS counter runs on the cai-sources
   list (the global OL counter in style.css excludes this list via
   :not(.cai-sources__list)). */
.cai-sources__num {
  font-family: var(--cai-font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--cai-primary-dark);
  line-height: 1.35;
  font-variant-numeric: tabular-nums;
}
.cai-sources__body {
  min-width: 0;                /* allow wrapping */
}

/* --- Title link --- */
.cai-sources__title {
  display: inline-flex;
  align-items: baseline;
  gap: 0.3rem;
  font-family: var(--cai-font-sans);
  font-size: 0.98rem;
  font-weight: 500;
  line-height: 1.35;
  color: var(--cai-text-strong);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--cai-duration-fast) var(--cai-easing),
              color        var(--cai-duration-fast) var(--cai-easing);
}
.cai-sources__title:hover {
  color: var(--cai-primary-dark);
  border-bottom-color: var(--cai-primary);
}
.cai-sources__ext {
  color: var(--cai-text-muted);
  flex-shrink: 0;
}

/* --- Meta row — small chips --- */
.cai-sources__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 0.85rem;
  margin: 0.35rem 0 0;
  font-size: 0.82rem;
  color: var(--cai-text-muted);
  font-variant-numeric: tabular-nums;
}
.cai-sources__publisher { font-weight: 500; color: var(--cai-text-secondary); }
.cai-sources__author    { font-style: italic; }
/* Post-launch P3 contrast fix: domain was inheriting --cai-text-muted (#6B7280)
   at opacity:0.85 → ~3.5:1 contrast on warm-paper card bg, below WCAG AA's 4.5:1.
   Switched to text-secondary (#475569 → ~6.8:1) and dropped the opacity. Still
   visually subordinate to source title (secondary < strong) but readable. */
.cai-sources__domain    { font-family: var(--cai-font-mono); font-size: 0.78rem; color: var(--cai-text-secondary); }
.cai-sources__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.05rem 0.5rem;
  background: rgba(5, 150, 105, 0.12);
  color: var(--cai-success);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--cai-radius-sm);
}
.cai-sources__retrieved {
  margin: 0.4rem 0 0;
  font-size: 0.78rem;
  /* Post-launch P3 contrast fix: --cai-text-muted (#6B7280) gives 4.43:1
     on warm-paper bg — fractionally below WCAG AA 4.5:1. Bumped to
     text-secondary for ~6.8:1. Italic preserved for visual hierarchy. */
  color: var(--cai-text-secondary);
  font-style: italic;
}

/* --- Copy-cite button --- */
.cai-copy-cite {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: var(--cai-space-md);
  padding: 0.32rem 0.7rem;
  font-family: var(--cai-font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--cai-btn-ghost-text);
  background: var(--cai-btn-ghost-bg);
  border: 1px solid var(--cai-card-border);
  border-radius: var(--cai-radius-sm);
  cursor: pointer;
  transition: background-color var(--cai-duration-fast) var(--cai-easing),
              color            var(--cai-duration-fast) var(--cai-easing),
              border-color     var(--cai-duration-fast) var(--cai-easing);
}
.cai-copy-cite:hover {
  background: var(--cai-btn-ghost-hover-bg);
  color: var(--cai-text-strong);
  border-color: var(--cai-border-strong);
}
.cai-copy-cite:focus-visible {
  outline: 2px solid var(--cai-primary);
  outline-offset: 2px;
}
.cai-copy-cite.is-copied {
  color: var(--cai-success);
  border-color: rgba(5, 150, 105, 0.4);
  background: rgba(5, 150, 105, 0.08);
}
.cai-copy-cite__icon {
  flex-shrink: 0;
}

/* --- Inline citation reference (when posts use <sup><a href="#source-N">) --- */
sup.cai-cite,
sup.citation-ref {
  font-size: 0.7em;
  line-height: 1;
  vertical-align: super;
  margin: 0 0.1em;
}
sup.cai-cite a,
sup.citation-ref a {
  color: var(--cai-citation);
  text-decoration: none;
  font-weight: 600;
}
sup.cai-cite a:hover,
sup.citation-ref a:hover {
  text-decoration: underline;
}

/* --- Highlight a source row when targeted via fragment (e.g. clicking a sup) --- */
.cai-sources__item:target {
  background: var(--cai-primary-subtle);
  margin: 0 calc(-1 * var(--cai-space-md));
  padding-left: var(--cai-space-md);
  padding-right: var(--cai-space-md);
  border-radius: var(--cai-radius-sm);
  animation: caiTargetFade 2.4s var(--cai-easing) 1;
}
@keyframes caiTargetFade {
  0%, 30%   { background: var(--cai-primary-subtle); }
  100%      { background: transparent; }
}
@media (prefers-reduced-motion: reduce) {
  .cai-sources__item:target { animation: none; background: var(--cai-primary-subtle); }
}

/* --- Mobile --- */
@media (max-width: 599px) {
  .cai-sources { padding: var(--cai-space-xl) var(--cai-space-lg); }
  .cai-sources__heading { font-size: 1.3rem; }
  .cai-sources__item { grid-template-columns: 1.5rem 1fr; gap: var(--cai-space-sm); }
}