web/themes/minimal-black/layouts/_default/single.html

{{ define "main" }}
  <section class="layout-page section-stack">
    <div class="article-layout">
      <article class="article-main space-y-4">
        <header class="space-y-2">
          <h1 class="heading-page text-2xl sm:text-3xl">{{ .Title }}</h1>

          <div class="text-[0.75rem] text-muted">
            {{ with .Date }}
              <span>{{ .Format "02 Jan 2006" }}</span>
            {{ end }}
            {{ with .ReadingTime }}
              <span> • {{ . }} min read</span>
            {{ end }}
          </div>

          {{ with .Params.description }}
            <p class="max-w-xl text-sm text-muted">
              {{ . }}
            </p>
          {{ end }}
        </header>

        <div class="card card-pad">
          <div class="markdown-body">
            {{ .Content }}
          </div>
        </div>
      </article>

      {{ if .TableOfContents }}
        <aside class="article-toc">
          <div class="toc-wrapper">
            <div class="toc-header">
              <h3 class="toc-title">
                <i class="fas fa-list-ul"></i>
                <span>Table of Contents</span>
              </h3>
              <button class="toc-toggle" aria-label="Toggle table of contents">
                <i class="fas fa-chevron-down"></i>
              </button>
            </div>
            <nav class="toc-nav">
              {{ .TableOfContents }}
            </nav>
          </div>
        </aside>

        <script>
        (function() {
          'use strict';

          const tocWrapper = document.querySelector('.toc-wrapper');
          const tocToggle = document.querySelector('.toc-toggle');
          const tocNav = document.querySelector('.toc-nav');
          const tocLinks = document.querySelectorAll('.toc-nav a');

          if (!tocWrapper || !tocNav) return;

          // =====================
          // MOBILE TOGGLE
          // =====================
          if (tocToggle) {
            tocToggle.addEventListener('click', function() {
              tocWrapper.classList.toggle('collapsed');
            });
          }

          // =====================
          // SMOOTH SCROLLING
          // =====================
          tocLinks.forEach(link => {
            link.addEventListener('click', function(e) {
              e.preventDefault();
              const targetId = this.getAttribute('href');
              const targetElement = document.querySelector(targetId);

              if (targetElement) {
                const yOffset = -80; // offset for sticky header
                const y = targetElement.getBoundingClientRect().top + window.pageYOffset + yOffset;

                window.scrollTo({
                  top: y,
                  behavior: 'smooth'
                });

                // Update URL without scrolling
                history.pushState(null, null, targetId);
              }
            });
          });

          // =====================
          // ACTIVE LINK HIGHLIGHT
          // =====================
          const headings = document.querySelectorAll('.markdown-body h1[id], .markdown-body h2[id], .markdown-body h3[id], .markdown-body h4[id], .markdown-body h5[id], .markdown-body h6[id]');

          let activeHeading = null;
          const observer = new IntersectionObserver(
            (entries) => {
              // Find all currently intersecting headings
              const intersectingHeadings = [];
              entries.forEach((entry) => {
                if (entry.isIntersecting) {
                  intersectingHeadings.push({
                    element: entry.target,
                    top: entry.boundingClientRect.top
                  });
                }
              });

              // If we have intersecting headings, find the one closest to the top
              if (intersectingHeadings.length > 0) {
                // Sort by distance from top (smallest positive value or largest negative)
                intersectingHeadings.sort((a, b) => Math.abs(a.top) - Math.abs(b.top));

                const closestHeading = intersectingHeadings[0].element;
                const id = closestHeading.getAttribute('id');

                if (id && id !== activeHeading) {
                  activeHeading = id;
                  const tocLink = document.querySelector(`.toc-nav a[href="#${id}"]`);

                  if (tocLink) {
                    // Remove active from all links
                    tocLinks.forEach(link => link.classList.remove('active'));
                    // Add active to current link
                    tocLink.classList.add('active');
                  }
                }
              }
            },
            {
              rootMargin: '-80px 0px -80%',
              threshold: [0, 0.25, 0.5, 0.75, 1]
            }
          );

          // Observe all headings
          headings.forEach((heading) => {
            observer.observe(heading);
          });

          // Highlight first item by default
          if (tocLinks.length > 0) {
            tocLinks[0].classList.add('active');
            activeHeading = tocLinks[0].getAttribute('href').substring(1);
          }
        })();
        </script>
      {{ end }}
    </div>
  </section>
{{ end }}