/* Research kit resource list (.rk-src*). Theme-aware favicon chips + hierarchy. */
/* ============================================================
   SOURCES
   Hierarchy: [num · favicon] | title (primary)
                              | meta (secondary, always new line)
                              | "Back to text" when cited
   ============================================================ */
.research-article .sources,
.research-article .rk-sources {
  background: var(--color-bg-deep);
  border-top: 1px solid var(--color-border-soft);
}
.research-article .rk-src-list {
  display: grid;
  gap: 1px;
  background: var(--color-border-soft);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.research-article .rk-src {
  position: relative;
  background: var(--color-bg-deep);
  padding: var(--space-4) var(--space-5);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-4);
  align-items: start;
  scroll-margin-top: 96px;
  transition: background 0.2s var(--ease);
}
.research-article .rk-src:hover { background: var(--color-surface); }
.research-article .rk-src:target {
  background: var(--color-accent-dim);
  box-shadow: inset 3px 0 0 var(--color-accent);
}

.research-article .rk-src-lead {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-top: 2px;
}
.research-article .rk-src-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-faint);
  min-width: 1.4em;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* Theme-aware favicon chip: never hard #fff (blows out on dark). */
.research-article .rk-src-favicon {
  width: 20px;
  height: 20px;
  border-radius: 3px;
  flex: none;
  object-fit: contain;
  box-sizing: border-box;
  padding: 2px;
  background: var(--color-surface-2);
  box-shadow: inset 0 0 0 1px var(--color-border-soft);
}
.research-article .rk-src-favicon[data-plate="light"] {
  background: #fff;
  box-shadow: inset 0 0 0 1px var(--color-border-soft);
}
@media (prefers-color-scheme: light) {
  .research-article .rk-src-favicon[data-plate="light"] {
    background: var(--color-surface);
  }
}

/* Main column: stacked hierarchy */
.research-article .rk-src-main {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.35rem;
  min-width: 0;
}

.research-article .rk-src-link {
  display: block;
  text-decoration: none;
  min-width: 0;
  max-width: 100%;
}
.research-article .rk-src-title-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.55rem;
  min-width: 0;
}
.research-article .rk-src-title {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: 600;
  line-height: 1.4;
  min-width: 0;
}
.research-article .rk-src-link:hover .rk-src-title {
  color: var(--color-accent);
}

/* Explicit "Open" control so the external glyph is not mistaken for enter/back */
.research-article .rk-src-open {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  border: 1px solid var(--color-border-soft);
  border-radius: 999px;
  padding: 0.12rem 0.45rem 0.12rem 0.35rem;
  line-height: 1.2;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease);
}
.research-article .rk-src-open .rk-ext-icon {
  width: 10px;
  height: 10px;
  position: static;
  color: inherit;
}
.research-article .rk-src-link:hover .rk-src-open {
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 35%, var(--color-border-soft));
}

/* Secondary line: always below title (block, not inline with title) */
.research-article .rk-src-meta {
  display: block;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  line-height: 1.45;
  max-width: 100%;
  min-width: 0;
}
.research-article .rk-src-meta-full {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  word-break: break-word;
  color: var(--color-text-faint);
}

/* Clear text instead of bare ↩ (was read as enter/back control) */
.research-article .rk-src-back {
  display: inline-flex;
  align-items: center;
  margin-top: 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--color-text-faint);
  border-bottom: 1px solid transparent;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease);
}
.research-article .rk-src-back:hover {
  color: var(--color-accent);
  border-bottom-color: color-mix(in srgb, var(--color-accent) 45%, transparent);
}

@media (max-width: 520px) {
  .research-article .rk-src {
    padding: var(--space-3) var(--space-4);
    gap: var(--space-3);
  }
  .research-article .rk-src-open-text {
    /* Keep glyph; drop word on very narrow if needed — still labeled via aria */
  }
}