citation.css

harun.bspt2014@gmail.com

I’ll build this as a production-ready citation.css module for your RX Theme: global citation tokens, inline citations, reference chips, bibliography cards, medical-source badges, dark mode, print style, responsive behavior, and accessibility states.

My dear friend, place this full code inside:

assets/static/static-css/components/citation.css

/* ==========================================================================
   RX Theme - Citation Component
   File: assets/static/static-css/components/citation.css
   Purpose:
   - Inline citation chips
   - Evidence/reference badges
   - Medical source notes
   - References / bibliography blocks
   - DOI, PMID, guideline, FDA, WHO, CDC, PubMed source styling
   - Print-friendly citation formatting
   ========================================================================== */


/* ==========================================================================
   1. Citation Design Tokens
   ========================================================================== */

:root {
  --rx-citation-font-family: inherit;
  --rx-citation-font-size: 0.78em;
  --rx-citation-line-height: 1;
  --rx-citation-font-weight: 600;

  --rx-citation-color: var(--rx-color-primary, #135cc5);
  --rx-citation-color-hover: var(--rx-color-primary-hover, #0b3f91);
  --rx-citation-color-active: var(--rx-color-primary-active, #082d69);

  --rx-citation-bg: color-mix(in srgb, var(--rx-citation-color) 10%, transparent);
  --rx-citation-bg-hover: color-mix(in srgb, var(--rx-citation-color) 16%, transparent);
  --rx-citation-bg-active: color-mix(in srgb, var(--rx-citation-color) 22%, transparent);

  --rx-citation-border-color: color-mix(in srgb, var(--rx-citation-color) 28%, transparent);
  --rx-citation-border-color-hover: color-mix(in srgb, var(--rx-citation-color) 45%, transparent);

  --rx-citation-radius: 999px;
  --rx-citation-padding-block: 0.18em;
  --rx-citation-padding-inline: 0.45em;
  --rx-citation-gap: 0.25em;

  --rx-citation-shadow: none;
  --rx-citation-shadow-hover: 0 2px 8px rgb(0 0 0 / 0.08);

  --rx-reference-bg: var(--rx-surface, #ffffff);
  --rx-reference-color: var(--rx-text, #162033);
  --rx-reference-muted-color: var(--rx-text-muted, #667085);
  --rx-reference-border-color: var(--rx-border, #e6eaf0);
  --rx-reference-radius: var(--rx-radius-md, 12px);
  --rx-reference-padding: 1rem;
  --rx-reference-gap: 0.75rem;

  --rx-evidence-high: #027a48;
  --rx-evidence-moderate: #b54708;
  --rx-evidence-low: #b42318;
  --rx-evidence-review: #175cd3;
  --rx-evidence-guideline: #5925dc;
}


/* ==========================================================================
   2. Base Inline Citation
   Example:
   <a class="rx-citation" href="#ref-1">1</a>
   <sup><a class="rx-citation" href="#ref-1">1</a></sup>
   ========================================================================== */

.rx-citation,
.article-content .rx-citation,
.entry-content .rx-citation {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--rx-citation-gap);
  min-width: 1.55em;
  min-height: 1.55em;
  padding: var(--rx-citation-padding-block) var(--rx-citation-padding-inline);
  border: 1px solid var(--rx-citation-border-color);
  border-radius: var(--rx-citation-radius);
  background: var(--rx-citation-bg);
  color: var(--rx-citation-color);
  font-family: var(--rx-citation-font-family);
  font-size: var(--rx-citation-font-size);
  font-weight: var(--rx-citation-font-weight);
  line-height: var(--rx-citation-line-height);
  text-decoration: none;
  vertical-align: super;
  white-space: nowrap;
  cursor: pointer;
  box-shadow: var(--rx-citation-shadow);
  transition:
    color 180ms ease,
    background-color 180ms ease,
    border-color 180ms ease,
    box-shadow 180ms ease,
    transform 180ms ease;
}

.rx-citation:hover,
.rx-citation:focus-visible {
  color: var(--rx-citation-color-hover);
  background: var(--rx-citation-bg-hover);
  border-color: var(--rx-citation-border-color-hover);
  box-shadow: var(--rx-citation-shadow-hover);
  text-decoration: none;
  transform: translateY(-1px);
}

.rx-citation:active {
  color: var(--rx-citation-color-active);
  background: var(--rx-citation-bg-active);
  transform: translateY(0);
}

.rx-citation:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--rx-citation-color) 32%, transparent);
  outline-offset: 2px;
}


/* ==========================================================================
   3. Citation Inside Sup Tag
   ========================================================================== */

sup .rx-citation,
.rx-citation-wrapper sup .rx-citation {
  vertical-align: baseline;
}

sup:has(.rx-citation) {
  line-height: 0;
}


/* ==========================================================================
   4. Citation Variants
   ========================================================================== */

.rx-citation--square {
  border-radius: 0.4em;
}

.rx-citation--plain {
  min-width: auto;
  min-height: auto;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.rx-citation--plain:hover,
.rx-citation--plain:focus-visible {
  background: transparent;
  box-shadow: none;
}

.rx-citation--bracket::before {
  content: "[";
}

.rx-citation--bracket::after {
  content: "]";
}

.rx-citation--doi::before {
  content: "DOI:";
  font-size: 0.82em;
  font-weight: 700;
  opacity: 0.75;
}

.rx-citation--pmid::before {
  content: "PMID:";
  font-size: 0.82em;
  font-weight: 700;
  opacity: 0.75;
}

.rx-citation--external::after {
  content: "↗";
  font-size: 0.78em;
  line-height: 1;
  opacity: 0.8;
}


/* ==========================================================================
   5. Citation Group
   Example:
   <span class="rx-citation-group">
     <a class="rx-citation">1</a>
     <a class="rx-citation">2</a>
   </span>
   ========================================================================== */

.rx-citation-group {
  display: inline-flex;
  align-items: center;
  gap: 0.2em;
  vertical-align: super;
}

.rx-citation-group .rx-citation {
  vertical-align: baseline;
}

.rx-citation-group--compact {
  gap: 0;
}

.rx-citation-group--compact .rx-citation {
  margin-inline-start: -0.15em;
}

.rx-citation-group--compact .rx-citation:first-child {
  margin-inline-start: 0;
}


/* ==========================================================================
   6. Reference Section Wrapper
   Example:
   <section class="rx-references" id="references">
   ========================================================================== */

.rx-references {
  margin-block: clamp(2rem, 4vw, 4rem);
  padding-block-start: clamp(1.25rem, 3vw, 2rem);
  border-block-start: 1px solid var(--rx-reference-border-color);
  color: var(--rx-reference-color);
}

.rx-references__header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-block-end: 1rem;
}

.rx-references__title {
  margin: 0;
  color: var(--rx-reference-color);
  font-size: clamp(1.35rem, 2.5vw, 2rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.rx-references__subtitle {
  margin: 0.35rem 0 0;
  color: var(--rx-reference-muted-color);
  font-size: 0.95rem;
  line-height: 1.6;
}

.rx-references__list {
  display: grid;
  gap: var(--rx-reference-gap);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: rx-reference-counter;
}

.rx-references__list--numbered {
  list-style: none;
}

.rx-references__empty {
  padding: 1rem;
  border: 1px dashed var(--rx-reference-border-color);
  border-radius: var(--rx-reference-radius);
  color: var(--rx-reference-muted-color);
  background: color-mix(in srgb, var(--rx-reference-bg) 90%, #f6f8fb);
}


/* ==========================================================================
   7. Reference Item / Card
   ========================================================================== */

.rx-reference {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.85rem;
  padding: var(--rx-reference-padding);
  border: 1px solid var(--rx-reference-border-color);
  border-radius: var(--rx-reference-radius);
  background: var(--rx-reference-bg);
  color: var(--rx-reference-color);
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.04);
  scroll-margin-block-start: 7rem;
  transition:
    border-color 180ms ease,
    box-shadow 180ms ease,
    transform 180ms ease,
    background-color 180ms ease;
}

.rx-reference:hover {
  border-color: color-mix(in srgb, var(--rx-citation-color) 28%, var(--rx-reference-border-color));
  box-shadow: 0 8px 28px rgb(0 0 0 / 0.08);
  transform: translateY(-1px);
}

.rx-reference:target {
  border-color: var(--rx-citation-color);
  background:
    linear-gradient(
      90deg,
      color-mix(in srgb, var(--rx-citation-color) 8%, transparent),
      transparent 50%
    ),
    var(--rx-reference-bg);
  box-shadow:
    0 0 0 3px color-mix(in srgb, var(--rx-citation-color) 18%, transparent),
    0 8px 28px rgb(0 0 0 / 0.08);
}

.rx-reference__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.15rem;
  height: 2.15rem;
  border-radius: 50%;
  background: var(--rx-citation-bg);
  color: var(--rx-citation-color);
  font-size: 0.9rem;
  font-weight: 800;
  line-height: 1;
  flex: 0 0 auto;
}

.rx-reference__body {
  min-width: 0;
}

.rx-reference__title {
  margin: 0;
  color: var(--rx-reference-color);
  font-size: 1rem;
  font-weight: 750;
  line-height: 1.45;
}

.rx-reference__title a {
  color: inherit;
  text-decoration-color: color-mix(in srgb, currentColor 28%, transparent);
  text-underline-offset: 0.2em;
}

.rx-reference__title a:hover,
.rx-reference__title a:focus-visible {
  color: var(--rx-citation-color);
  text-decoration-color: currentColor;
}

.rx-reference__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.65rem;
  margin-block-start: 0.45rem;
  color: var(--rx-reference-muted-color);
  font-size: 0.88rem;
  line-height: 1.5;
}

.rx-reference__authors,
.rx-reference__journal,
.rx-reference__year,
.rx-reference__publisher,
.rx-reference__accessed {
  display: inline;
}

.rx-reference__abstract,
.rx-reference__note {
  margin: 0.65rem 0 0;
  color: var(--rx-reference-muted-color);
  font-size: 0.94rem;
  line-height: 1.65;
}

.rx-reference__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-block-start: 0.8rem;
}

.rx-reference__link,
.rx-reference__backlink {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  width: fit-content;
  padding: 0.45em 0.7em;
  border: 1px solid var(--rx-reference-border-color);
  border-radius: 999px;
  background: color-mix(in srgb, var(--rx-citation-color) 7%, transparent);
  color: var(--rx-citation-color);
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  transition:
    background-color 180ms ease,
    border-color 180ms ease,
    color 180ms ease,
    transform 180ms ease;
}

.rx-reference__link:hover,
.rx-reference__backlink:hover,
.rx-reference__link:focus-visible,
.rx-reference__backlink:focus-visible {
  background: color-mix(in srgb, var(--rx-citation-color) 13%, transparent);
  border-color: color-mix(in srgb, var(--rx-citation-color) 35%, transparent);
  color: var(--rx-citation-color-hover);
  transform: translateY(-1px);
}

.rx-reference__link:focus-visible,
.rx-reference__backlink:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--rx-citation-color) 25%, transparent);
  outline-offset: 2px;
}

.rx-reference__link[target="_blank"]::after {
  content: "↗";
  font-size: 0.8em;
}


/* ==========================================================================
   8. Automatic Numbering
   ========================================================================== */

.rx-references__list--auto .rx-reference {
  counter-increment: rx-reference-counter;
}

.rx-references__list--auto .rx-reference__number::before {
  content: counter(rx-reference-counter);
}

.rx-references__list--auto .rx-reference__number {
  font-size: 0;
}

.rx-references__list--auto .rx-reference__number::before {
  font-size: 0.9rem;
}


/* ==========================================================================
   9. Evidence Badges
   ========================================================================== */

.rx-evidence-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  width: fit-content;
  padding: 0.35em 0.65em;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  white-space: nowrap;
}

.rx-evidence-badge::before {
  content: "";
  width: 0.55em;
  height: 0.55em;
  border-radius: 50%;
  background: currentColor;
}

.rx-evidence-badge--high {
  color: var(--rx-evidence-high);
  background: color-mix(in srgb, var(--rx-evidence-high) 11%, transparent);
  border-color: color-mix(in srgb, var(--rx-evidence-high) 28%, transparent);
}

.rx-evidence-badge--moderate {
  color: var(--rx-evidence-moderate);
  background: color-mix(in srgb, var(--rx-evidence-moderate) 12%, transparent);
  border-color: color-mix(in srgb, var(--rx-evidence-moderate) 30%, transparent);
}

.rx-evidence-badge--low {
  color: var(--rx-evidence-low);
  background: color-mix(in srgb, var(--rx-evidence-low) 10%, transparent);
  border-color: color-mix(in srgb, var(--rx-evidence-low) 28%, transparent);
}

.rx-evidence-badge--review {
  color: var(--rx-evidence-review);
  background: color-mix(in srgb, var(--rx-evidence-review) 10%, transparent);
  border-color: color-mix(in srgb, var(--rx-evidence-review) 28%, transparent);
}

.rx-evidence-badge--guideline {
  color: var(--rx-evidence-guideline);
  background: color-mix(in srgb, var(--rx-evidence-guideline) 10%, transparent);
  border-color: color-mix(in srgb, var(--rx-evidence-guideline) 28%, transparent);
}


/* ==========================================================================
   10. Source Type Chips
   ========================================================================== */

.rx-source-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  width: fit-content;
  padding: 0.35em 0.65em;
  border: 1px solid var(--rx-reference-border-color);
  border-radius: 999px;
  background: color-mix(in srgb, var(--rx-reference-bg) 92%, #f3f6fb);
  color: var(--rx-reference-muted-color);
  font-size: 0.78rem;
  font-weight: 750;
  line-height: 1;
  white-space: nowrap;
}

.rx-source-chip--pubmed::before {
  content: "PM";
}

.rx-source-chip--doi::before {
  content: "DOI";
}

.rx-source-chip--fda::before {
  content: "FDA";
}

.rx-source-chip--who::before {
  content: "WHO";
}

.rx-source-chip--cdc::before {
  content: "CDC";
}

.rx-source-chip--guideline::before {
  content: "GL";
}

.rx-source-chip--pubmed::before,
.rx-source-chip--doi::before,
.rx-source-chip--fda::before,
.rx-source-chip--who::before,
.rx-source-chip--cdc::before,
.rx-source-chip--guideline::before {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.55em;
  height: 1.55em;
  padding-inline: 0.28em;
  border-radius: 999px;
  background: var(--rx-citation-bg);
  color: var(--rx-citation-color);
  font-size: 0.72em;
  font-weight: 900;
}


/* ==========================================================================
   11. Citation Tooltip
   CSS-only tooltip by data-citation-title
   Example:
   <a class="rx-citation rx-citation--tooltip" data-citation-title="WHO guideline 2024">1</a>
   ========================================================================== */

.rx-citation--tooltip {
  position: relative;
}

.rx-citation--tooltip::after {
  content: attr(data-citation-title);
  position: absolute;
  inset-block-end: calc(100% + 0.55rem);
  inset-inline-start: 50%;
  z-index: 30;
  width: max-content;
  max-width: min(280px, 80vw);
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--rx-reference-border-color);
  border-radius: 0.65rem;
  background: var(--rx-reference-color);
  color: var(--rx-reference-bg);
  font-size: 0.78rem;
  font-weight: 600;
  line-height: 1.4;
  text-align: start;
  white-space: normal;
  box-shadow: 0 12px 28px rgb(0 0 0 / 0.18);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateX(-50%) translateY(0.25rem);
  transition:
    opacity 160ms ease,
    visibility 160ms ease,
    transform 160ms ease;
}

.rx-citation--tooltip::before {
  content: "";
  position: absolute;
  inset-block-end: calc(100% + 0.25rem);
  inset-inline-start: 50%;
  z-index: 31;
  width: 0.6rem;
  height: 0.6rem;
  background: var(--rx-reference-color);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateX(-50%) rotate(45deg);
  transition:
    opacity 160ms ease,
    visibility 160ms ease;
}

.rx-citation--tooltip:hover::after,
.rx-citation--tooltip:hover::before,
.rx-citation--tooltip:focus-visible::after,
.rx-citation--tooltip:focus-visible::before {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.rx-citation--tooltip:hover::before,
.rx-citation--tooltip:focus-visible::before {
  transform: translateX(-50%) rotate(45deg);
}


/* ==========================================================================
   12. Medical Article Source Box
   ========================================================================== */

.rx-source-box {
  margin-block: 1.5rem;
  padding: 1rem;
  border: 1px solid var(--rx-reference-border-color);
  border-inline-start: 4px solid var(--rx-citation-color);
  border-radius: var(--rx-reference-radius);
  background:
    linear-gradient(
      90deg,
      color-mix(in srgb, var(--rx-citation-color) 8%, transparent),
      transparent 55%
    ),
    var(--rx-reference-bg);
  color: var(--rx-reference-color);
}

.rx-source-box__title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.45rem;
  color: var(--rx-reference-color);
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.3;
}

.rx-source-box__title::before {
  content: "✓";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.45rem;
  height: 1.45rem;
  border-radius: 50%;
  background: var(--rx-citation-bg);
  color: var(--rx-citation-color);
  font-size: 0.82rem;
  font-weight: 900;
}

.rx-source-box__text {
  margin: 0;
  color: var(--rx-reference-muted-color);
  font-size: 0.95rem;
  line-height: 1.7;
}

.rx-source-box__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-block-start: 0.85rem;
}


/* ==========================================================================
   13. Fact Checked / Reviewed By Component
   ========================================================================== */

.rx-fact-check {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.75rem;
  margin-block: 1.25rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--rx-reference-border-color);
  border-radius: var(--rx-reference-radius);
  background: color-mix(in srgb, var(--rx-reference-bg) 94%, #eef4ff);
}

.rx-fact-check__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 50%;
  background: var(--rx-citation-bg);
  color: var(--rx-citation-color);
  font-weight: 900;
}

.rx-fact-check__icon::before {
  content: "✓";
}

.rx-fact-check__label {
  margin: 0;
  color: var(--rx-reference-color);
  font-size: 0.92rem;
  font-weight: 800;
  line-height: 1.4;
}

.rx-fact-check__text {
  margin: 0.2rem 0 0;
  color: var(--rx-reference-muted-color);
  font-size: 0.9rem;
  line-height: 1.6;
}


/* ==========================================================================
   14. Citation Notice / Medical Disclaimer Small Block
   ========================================================================== */

.rx-citation-notice {
  margin-block: 1rem;
  padding: 0.85rem 1rem;
  border: 1px solid color-mix(in srgb, var(--rx-evidence-moderate) 32%, transparent);
  border-radius: var(--rx-reference-radius);
  background: color-mix(in srgb, var(--rx-evidence-moderate) 8%, transparent);
  color: var(--rx-reference-color);
  font-size: 0.92rem;
  line-height: 1.65;
}

.rx-citation-notice strong {
  color: color-mix(in srgb, var(--rx-evidence-moderate) 85%, #000);
}


/* ==========================================================================
   15. Bibliography Compact Mode
   ========================================================================== */

.rx-references--compact .rx-references__list {
  gap: 0.5rem;
}

.rx-references--compact .rx-reference {
  padding: 0.75rem;
  border-radius: 0.75rem;
}

.rx-references--compact .rx-reference__number {
  width: 1.8rem;
  height: 1.8rem;
  font-size: 0.78rem;
}

.rx-references--compact .rx-reference__title {
  font-size: 0.95rem;
}

.rx-references--compact .rx-reference__abstract,
.rx-references--compact .rx-reference__note {
  font-size: 0.88rem;
}


/* ==========================================================================
   16. Two-column References on Large Screens
   ========================================================================== */

@media (min-width: 900px) {
  .rx-references--columns .rx-references__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }
}


/* ==========================================================================
   17. Citation Table Support
   ========================================================================== */

.rx-reference-table {
  width: 100%;
  border-collapse: collapse;
  margin-block: 1.25rem;
  border: 1px solid var(--rx-reference-border-color);
  border-radius: var(--rx-reference-radius);
  overflow: hidden;
  background: var(--rx-reference-bg);
  font-size: 0.94rem;
}

.rx-reference-table th,
.rx-reference-table td {
  padding: 0.75rem;
  border-block-end: 1px solid var(--rx-reference-border-color);
  text-align: start;
  vertical-align: top;
}

.rx-reference-table th {
  background: color-mix(in srgb, var(--rx-citation-color) 7%, transparent);
  color: var(--rx-reference-color);
  font-weight: 800;
}

.rx-reference-table tr:last-child td {
  border-block-end: 0;
}

.rx-reference-table a {
  color: var(--rx-citation-color);
  font-weight: 700;
}


/* ==========================================================================
   18. RTL Support
   ========================================================================== */

[dir="rtl"] .rx-reference,
[dir="rtl"] .rx-fact-check {
  direction: rtl;
}

[dir="rtl"] .rx-source-box {
  border-inline-start: 1px solid var(--rx-reference-border-color);
  border-inline-end: 4px solid var(--rx-citation-color);
}


/* ==========================================================================
   19. Dark Mode
   ========================================================================== */

@media (prefers-color-scheme: dark) {
  :root {
    --rx-citation-color: var(--rx-color-primary-light, #8ab4ff);
    --rx-citation-color-hover: #b5ccff;
    --rx-citation-color-active: #d4e2ff;

    --rx-reference-bg: var(--rx-surface, #101828);
    --rx-reference-color: var(--rx-text, #f3f6fb);
    --rx-reference-muted-color: var(--rx-text-muted, #b7c1d1);
    --rx-reference-border-color: var(--rx-border, #263247);

    --rx-citation-shadow-hover: 0 4px 14px rgb(0 0 0 / 0.35);
  }

  .rx-reference {
    box-shadow: 0 1px 2px rgb(0 0 0 / 0.25);
  }

  .rx-reference:hover {
    box-shadow: 0 10px 30px rgb(0 0 0 / 0.35);
  }

  .rx-source-chip {
    background: color-mix(in srgb, var(--rx-reference-bg) 85%, #ffffff);
  }
}


/* Manual dark class support */
.rx-theme-dark,
[data-theme="dark"] {
  --rx-citation-color: var(--rx-color-primary-light, #8ab4ff);
  --rx-citation-color-hover: #b5ccff;
  --rx-citation-color-active: #d4e2ff;

  --rx-reference-bg: var(--rx-surface, #101828);
  --rx-reference-color: var(--rx-text, #f3f6fb);
  --rx-reference-muted-color: var(--rx-text-muted, #b7c1d1);
  --rx-reference-border-color: var(--rx-border, #263247);

  --rx-citation-shadow-hover: 0 4px 14px rgb(0 0 0 / 0.35);
}


/* ==========================================================================
   20. Responsive
   ========================================================================== */

@media (max-width: 640px) {
  .rx-references__header {
    display: block;
  }

  .rx-reference {
    grid-template-columns: 1fr;
  }

  .rx-reference__number {
    width: fit-content;
    min-width: 2rem;
    height: 2rem;
    padding-inline: 0.65rem;
    border-radius: 999px;
  }

  .rx-reference__meta,
  .rx-reference__actions,
  .rx-source-box__links {
    gap: 0.4rem;
  }

  .rx-citation--tooltip::after {
    max-width: min(240px, 88vw);
  }

  .rx-reference-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}


/* ==========================================================================
   21. Reduced Motion
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  .rx-citation,
  .rx-reference,
  .rx-reference__link,
  .rx-reference__backlink,
  .rx-citation--tooltip::before,
  .rx-citation--tooltip::after {
    transition: none;
  }

  .rx-citation:hover,
  .rx-citation:focus-visible,
  .rx-reference:hover,
  .rx-reference__link:hover,
  .rx-reference__backlink:hover {
    transform: none;
  }
}


/* ==========================================================================
   22. Print Style
   ========================================================================== */

@media print {
  .rx-citation {
    border: 0;
    background: transparent;
    color: #000;
    box-shadow: none;
    text-decoration: none;
  }

  .rx-citation::before {
    content: "[";
  }

  .rx-citation::after {
    content: "]";
  }

  .rx-reference,
  .rx-source-box,
  .rx-fact-check,
  .rx-citation-notice {
    break-inside: avoid;
    box-shadow: none;
    background: #fff;
    color: #000;
  }

  .rx-reference__link::after,
  .rx-reference__title a::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
    font-weight: 400;
    word-break: break-all;
  }

  .rx-reference__backlink,
  .rx-citation--tooltip::before,
  .rx-citation--tooltip::after {
    display: none;
  }

  .rx-references {
    border-block-start: 1px solid #000;
  }
}


/* ==========================================================================
   23. Utility Helpers
   ========================================================================== */

.rx-citation-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0 0 0 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.rx-reference-muted {
  color: var(--rx-reference-muted-color);
}

.rx-reference-break {
  overflow-wrap: anywhere;
  word-break: break-word;
}

.rx-reference-no-link-style a {
  color: inherit;
  text-decoration: none;
}

.rx-reference-no-link-style a:hover,
.rx-reference-no-link-style a:focus-visible {
  color: var(--rx-citation-color);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}


/* ==========================================================================
   24. Optional WordPress Content Integration
   ========================================================================== */

.entry-content a[href^="#ref-"],
.article-content a[href^="#ref-"],
.post-content a[href^="#ref-"] {
  scroll-margin-block-start: 7rem;
}

.entry-content sup a[href^="#ref-"]:not(.rx-citation),
.article-content sup a[href^="#ref-"]:not(.rx-citation),
.post-content sup a[href^="#ref-"]:not(.rx-citation) {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.55em;
  min-height: 1.55em;
  padding: var(--rx-citation-padding-block) var(--rx-citation-padding-inline);
  border: 1px solid var(--rx-citation-border-color);
  border-radius: var(--rx-citation-radius);
  background: var(--rx-citation-bg);
  color: var(--rx-citation-color);
  font-size: var(--rx-citation-font-size);
  font-weight: var(--rx-citation-font-weight);
  line-height: var(--rx-citation-line-height);
  text-decoration: none;
}


/* ==========================================================================
   25. Fallback for Browsers Without color-mix()
   ========================================================================== */

@supports not (color: color-mix(in srgb, #000 50%, #fff)) {
  :root {
    --rx-citation-bg: #eef5ff;
    --rx-citation-bg-hover: #e2efff;
    --rx-citation-bg-active: #d6e8ff;
    --rx-citation-border-color: #b8d4ff;
    --rx-citation-border-color-hover: #8bb9ff;
  }

  .rx-source-box {
    background: #f5f9ff;
  }

  .rx-fact-check {
    background: #f5f9ff;
  }

  .rx-citation-notice {
    background: #fff7ed;
    border-color: #fed7aa;
  }
}

Example HTML use:

<p>
  High-quality medical articles should cite reliable sources
  <sup><a class="rx-citation rx-citation--tooltip" href="#ref-1" data-citation-title="PubMed clinical review">1</a></sup>
  and updated guidelines
  <sup><a class="rx-citation rx-citation--tooltip" href="#ref-2" data-citation-title="WHO guideline">2</a></sup>.
</p>

<section class="rx-references rx-references--compact" id="references">
  <div class="rx-references__header">
    <div>
      <h2 class="rx-references__title">References</h2>
      <p class="rx-references__subtitle">Evidence sources used in this article.</p>
    </div>
  </div>

  <ol class="rx-references__list">
    <li class="rx-reference" id="ref-1">
      <span class="rx-reference__number">1</span>
      <div class="rx-reference__body">
        <h3 class="rx-reference__title">
          <a href="#" target="_blank" rel="noopener noreferrer">
            PubMed clinical review source title
          </a>
        </h3>
        <div class="rx-reference__meta">
          <span class="rx-source-chip rx-source-chip--pubmed">PubMed</span>
          <span class="rx-evidence-badge rx-evidence-badge--review">Review</span>
          <span>Accessed 2026</span>
        </div>
        <p class="rx-reference__note">
          Short source note or evidence summary.
        </p>
        <div class="rx-reference__actions">
          <a class="rx-reference__backlink" href="#citation-1">Back to article</a>
        </div>
      </div>
    </li>
  </ol>
</section>

Best import path in your main CSS:

@import url("./components/citation.css");

Or enqueue it separately in WordPress for better modular loading:

wp_enqueue_style(
    'rx-citation',
    get_theme_file_uri('/assets/static/static-css/components/citation.css'),
    array(),
    RX_THEME_VERSION
);

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