app/src/components/Footer.astro

---
interface Props {
  citationText: string;
  bibtex: string;
  licence?: string;
  doi?: string;
}
const { citationText, bibtex, licence, doi } = Astro.props as Props;
---

<footer class="footer">
  <div class="footer-inner">
    <section class="citation-block">
      <h3>Citation</h3>
      <p>For attribution in academic contexts, please cite this work as</p>
      <pre class="citation short">{citationText}</pre>

      <p>BibTeX citation</p>
      <pre class="citation long">{bibtex}</pre>
    </section>
    {
      doi && (
        <section class="doi-block">
          <h3>DOI</h3>
          <p>
            <a
              href={`https://doi.org/${doi}`}
              target="_blank"
              rel="noopener noreferrer"
            >
              {doi}
            </a>
          </p>
        </section>
      )
    }
    {
      licence && (
        <section class="reuse-block">
          <h3>Reuse</h3>
          <p set:html={licence} />
        </section>
      )
    }
    <section class="references-block">
      <slot />
    </section>
    <div class="template-credit">
      <p>
        Made with ❤️ with <a
          href="https://huggingface.co/spaces/tfrere/research-article-template"
          target="_blank"
          rel="noopener noreferrer">research article template</a
        >
      </p>
    </div>
  </div>
</footer>

<script is:inline>
  (() => {
    const getFooter = () =>
      document.currentScript?.closest("footer") ||
      document.querySelector("footer.footer");
    const footer = getFooter();
    if (!footer) return;
    const target = footer.querySelector(".references-block");
    if (!target) return;

    const contentRoot =
      document.querySelector("section.content-grid main") ||
      document.querySelector("main") ||
      document.body;

    const ensureHeading = (text) => {
      const exists = Array.from(target.children).some(
        (c) =>
          c.tagName === "H3" &&
          c.textContent.trim().toLowerCase() === text.toLowerCase(),
      );
      if (!exists) {
        const h = document.createElement("h3");
        h.textContent = text;
        target.appendChild(h);
      }
    };

    const moveIntoFooter = (element, headingText) => {
      if (!element) return false;

      // Remove an eventual heading already included inside the block (avoid duplicates)
      const firstHeading = element.querySelector(
        ":scope > h1, :scope > h2, :scope > h3",
      );
      if (firstHeading) {
        const txt = (firstHeading.textContent || "").trim().toLowerCase();
        const targetTxt = headingText.trim().toLowerCase();
        if (
          txt === targetTxt ||
          txt.includes("reference") ||
          txt.includes("bibliograph")
        ) {
          firstHeading.remove();
        }
      }

      // Move footnote backref links inside paragraphs BEFORE moving element
      if (element.classList && element.classList.contains("footnotes")) {
        const footnoteItems = element.querySelectorAll("li");
        footnoteItems.forEach((item) => {
          const backrefContainer = item.querySelector("small.backrefs");
          const lastP = item.querySelector("p:last-of-type");
          if (backrefContainer && lastP && !lastP.contains(backrefContainer)) {
            lastP.appendChild(document.createTextNode(" "));
            lastP.appendChild(backrefContainer);
          }
        });
      }

      ensureHeading(headingText);

      // Move element directly - this preserves KaTeX DOM structure and inline styles
      // KaTeX is already rendered at build-time, so we just need to preserve the HTML
      target.appendChild(element);

      return true;
    };
    const run = () => {
      // Prevent multiple runs
      if (footer.dataset.processed === "true") return false;

      const refSelectors = [
        "#bibliography-references-list",
        "[data-bibliography-block]",
        "#references",
        "#refs",
        ".references",
        ".bibliography",
      ];

      // Find ALL top-level reference/footnote sections (each chapter generates its own).
      // Filters out descendants to avoid matching both a container and its inner list.
      const findAllOutsideFooter = (selectors) => {
        const found = [];
        const searchRoots = [contentRoot, document.body].filter(Boolean);
        for (const root of searchRoots) {
          for (const sel of selectors) {
            root.querySelectorAll(sel).forEach((el) => {
              if (!footer.contains(el) && !found.includes(el)) found.push(el);
            });
          }
        }
        // Remove any element that is a descendant of another element in the list
        return found.filter(
          (el) => !found.some((other) => other !== el && other.contains(el)),
        );
      };

      const allRefsEls = findAllOutsideFooter(refSelectors);

      // Merge all reference sections into the first one, deduplicating by id
      let referencesEl = null;
      if (allRefsEls.length > 0) {
        referencesEl = allRefsEls[0];
        if (allRefsEls.length > 1) {
          // Collect existing ids from the first section
          const seenIds = new Set();
          referencesEl.querySelectorAll("li[id]").forEach((li) => seenIds.add(li.id));
          // Find or create the <ol> in the first section
          let targetOl = referencesEl.querySelector("ol");
          if (!targetOl) {
            targetOl = document.createElement("ol");
            targetOl.className = "references";
            referencesEl.appendChild(targetOl);
          }
          // Merge entries from remaining sections
          for (let i = 1; i < allRefsEls.length; i++) {
            allRefsEls[i].querySelectorAll("li").forEach((li) => {
              if (!li.id || !seenIds.has(li.id)) {
                if (li.id) seenIds.add(li.id);
                targetOl.appendChild(li);
              }
            });
            allRefsEls[i].remove();
          }
        }
      }

      // Merge all footnote sections the same way
      const allFootnoteEls = findAllOutsideFooter([
        "[data-built-footnotes]",
        ".footnotes",
        "section.footnotes",
        "div.footnotes",
      ]);

      let footnotesEl = null;
      if (allFootnoteEls.length > 0) {
        footnotesEl = allFootnoteEls[0];
        if (allFootnoteEls.length > 1) {
          const seenIds = new Set();
          footnotesEl.querySelectorAll("li[id]").forEach((li) => seenIds.add(li.id));
          let targetOl = footnotesEl.querySelector("ol");
          if (!targetOl) {
            targetOl = document.createElement("ol");
            footnotesEl.appendChild(targetOl);
          }
          for (let i = 1; i < allFootnoteEls.length; i++) {
            allFootnoteEls[i].querySelectorAll("li").forEach((li) => {
              if (!li.id || !seenIds.has(li.id)) {
                if (li.id) seenIds.add(li.id);
                targetOl.appendChild(li);
              }
            });
            allFootnoteEls[i].remove();
          }
        }
      }

      const movedRefs = moveIntoFooter(referencesEl, "References");
      const movedNotes = moveIntoFooter(footnotesEl, "Footnotes");

      if (movedRefs || movedNotes) {
        footer.dataset.processed = "true";
      }

      return movedRefs || movedNotes;
    };

    // Try multiple times to catch footnotes at different stages
    const attemptMove = () => {
      run();
    };

    // Try immediately
    attemptMove();

    // Try on DOMContentLoaded
    if (document.readyState === "loading") {
      document.addEventListener("DOMContentLoaded", attemptMove, {
        once: true,
      });
    }

    // Try on window load
    window.addEventListener(
      "load",
      () => {
        setTimeout(attemptMove, 100);
      },
      { once: true },
    );

    // Final attempt after a short delay
    setTimeout(attemptMove, 300);

    // Resize on window changes (e.g., fonts, layout)
    // No textarea auto-resize needed for <pre> blocks
  })();
</script>

<style is:global>
  .footer {
    contain: layout style;
    font-size: 0.8em;
    line-height: 1.7em;
    margin-top: 60px;
    margin-bottom: 0;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    color: rgba(0, 0, 0, 0.5);
  }

  .footer-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 60px 16px 48px;
    display: grid;
    grid-template-columns: 220px minmax(0, 680px) 260px;
    gap: 32px;
    align-items: start;
  }

  /* Use the parent grid (3 columns like .content-grid) */
  .citation-block,
  .references-block,
  .reuse-block,
  .doi-block {
    display: contents;
  }

  .citation-block > h3,
  .references-block > h3,
  .reuse-block > h3,
  .doi-block > h3 {
    grid-column: 1;
    font-size: 15px;
    margin: 0;
    text-align: right;
    padding-right: 30px;
  }

  .citation-block > :not(h3),
  .references-block > :not(h3),
  .reuse-block > :not(h3),
  .doi-block > :not(h3) {
    grid-column: 2;
  }

  .citation-block h3 {
    margin: 0 0 8px;
  }

  .citation-block h4 {
    margin: 16px 0 8px;
    font-size: 14px;
    text-transform: uppercase;
    color: var(--muted-color);
  }

  .citation-block p,
  .reuse-block p,
  .doi-block p,
  .footnotes ol,
  .footnotes ol p,
  .references {
    margin-top: 0;
  }

  /* Preserve KaTeX rendering in footnotes - essential for math formulas */
  /* Compensate for footer's 0.8em font-size */
  .footer .footnotes .katex {
    font-size: 1.25em; /* 1em / 0.8em = 1.25em to compensate */
    line-height: 1.21;
  }

  .footer .footnotes .katex-display {
    margin: 1em 0;
    text-align: center;
    display: block;
    overflow-x: auto;
    overflow-y: hidden;
  }

  .footer .footnotes .katex-display > .katex {
    display: block;
    text-align: center;
  }

  /* Preserve KaTeX internal structure */
  .footer .footnotes .katex .katex-html {
    display: inline-block;
  }

  .footer .footnotes .katex .base {
    display: inline-block;
  }

  /* Distill-like appendix citation styling */
  .citation {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
      "Liberation Mono", "Courier New", monospace;
    font-size: 11px;
    line-height: 15px;
    border-left: 1px solid rgba(0, 0, 0, 0.1);
    padding-left: 18px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: rgba(0, 0, 0, 0.02);
    padding: 10px 18px;
    border-radius: 3px;
    color: rgba(150, 150, 150, 1);
    overflow: hidden;
    margin-top: -12px;
    white-space: pre-wrap;
    word-wrap: break-word;
  }

  .citation a {
    color: rgba(0, 0, 0, 0.6);
    text-decoration: underline;
  }

  .citation.short {
    margin-top: -4px;
  }

  .references-block h3 {
    margin: 0;
  }

  /* Distill-like list styling for references/footnotes */
  .references-block ol {
    padding: 0 0 0 15px;
  }

  @media (min-width: 768px) {
    .references-block ol {
      padding: 0 0 0 30px;
      margin-left: -30px;
    }
  }

  .references-block li {
    margin-bottom: 1em;
  }

  .references-block a {
    color: var(--text-color);
  }

  [data-theme="dark"] .footer {
    border-top-color: rgba(255, 255, 255, 0.15);
    color: rgba(200, 200, 200, 0.8);
  }
  [data-theme="dark"] .citation {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.15);
    color: rgba(200, 200, 200, 1);
  }
  [data-theme="dark"] .citation a {
    color: rgba(255, 255, 255, 0.75);
  }

  /* Footer links: use primary color consistently */
  .footer a {
    color: var(--primary-color);
    border-bottom: 1px solid var(--link-underline);
    text-decoration: none;
  }
  .footer a:hover {
    color: var(--primary-color-hover);
    border-bottom-color: var(--link-underline-hover);
  }
  [data-theme="dark"] .footer a {
    color: var(--primary-color);
  }

  /* Template credit - discrete at the bottom */
  .template-credit {
    display: contents;
  }

  .template-credit p {
    grid-column: 2;
    margin: 24px 0 0 0;
    font-size: 0.85em;
    color: rgba(0, 0, 0, 0.5);
  }

  .template-credit a {
    color: rgba(0, 0, 0, 0.6);
    border-bottom: 1px solid rgba(0, 0, 0, 0.15);
  }

  .template-credit a:hover {
    color: rgba(0, 0, 0, 0.8);
    border-bottom-color: rgba(0, 0, 0, 0.3);
  }

  [data-theme="dark"] .template-credit p {
    color: rgba(200, 200, 200, 0.6);
  }

  [data-theme="dark"] .template-credit a {
    color: rgba(200, 200, 200, 0.7);
    border-bottom-color: rgba(255, 255, 255, 0.2);
  }

  [data-theme="dark"] .template-credit a:hover {
    color: rgba(200, 200, 200, 0.9);
    border-bottom-color: rgba(255, 255, 255, 0.35);
  }
</style>