Kanban Board — Neo-Brutalism

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<!--
Snippet Name: Kanban Board — Neo-Brutalism
Description: Hard-bordered kanban board with offset shadows, count badges, draggable task cards (HTML5 DnD), and an add-card affordance per column.
Author: DevSnips Contributors
Usage Example: Drop into any app shell as a project board widget. Drag cards between columns and click "+ ADD CARD" to create new tasks. Fully wired in preview.html.
-->
<div class="relative w-full" data-board="nb">

  <!-- Board -->
  <div class="border-2 border-black bg-white p-4 shadow-[8px_8px_0_0_#000] sm:p-5">
    <div class="board-cols flex gap-4 overflow-x-auto pb-2" data-board-cols>

      <!-- Column -->
      <section class="nb-col w-[280px] shrink-0 border-2 border-black bg-[#FFFDF5]" aria-label="Backlog">
        <header class="flex items-center justify-between border-b-2 border-black bg-[#FFE600] px-3 py-2">
          <h3 class="font-archivo text-sm font-extrabold uppercase tracking-tight">Backlog</h3>
          <span class="nb-count border-2 border-black bg-white px-2 font-mono text-[11px] font-bold shadow-[2px_2px_0_0_#000]" data-count>3</span>
        </header>
        <div class="nb-list space-y-3 p-3" data-list>
          <article class="nb-card cursor-grab border-2 border-black bg-white p-3 shadow-[3px_3px_0_0_#000] transition-transform duration-100 hover:translate-x-[2px] hover:translate-y-[2px] hover:shadow-[1px_1px_0_0_#000] active:cursor-grabbing" draggable="true" tabindex="0">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="border-2 border-black bg-[#FF4FA3] px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase text-white">P1</span>
              <span class="font-mono text-[10px] font-bold uppercase text-black/50">SNIP-104</span>
            </div>
            <h4 class="font-archivo text-[14px] font-bold leading-snug">Wire dark-mode toggle to root class</h4>
            <p class="mt-1 font-mono text-[11px] leading-snug text-black/60">Persist choice in localStorage and reflect on first paint.</p>
            <div class="mt-2.5 flex items-center justify-between">
              <div class="flex items-center gap-1.5">
                <span class="border border-black bg-[#00C2FF] px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase">css</span>
                <span class="border border-black bg-[#00E676] px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase">a11y</span>
              </div>
              <div class="flex h-7 w-7 items-center justify-center border-2 border-black bg-[#FFE600] font-archivo text-[11px] font-extrabold">RM</div>
            </div>
          </article>

          <article class="nb-card cursor-grab border-2 border-black bg-white p-3 shadow-[3px_3px_0_0_#000] transition-transform duration-100 hover:translate-x-[2px] hover:translate-y-[2px] hover:shadow-[1px_1px_0_0_#000] active:cursor-grabbing" draggable="true" tabindex="0">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="border-2 border-black bg-[#00C2FF] px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase text-black">P3</span>
              <span class="font-mono text-[10px] font-bold uppercase text-black/50">SNIP-118</span>
            </div>
            <h4 class="font-archivo text-[14px] font-bold leading-snug">Sketch onboarding empty state</h4>
            <p class="mt-1 font-mono text-[11px] leading-snug text-black/60">Three steps with inline illustrations and a CTA.</p>
            <div class="mt-2.5 flex items-center justify-between">
              <div class="flex items-center gap-1.5">
                <span class="border border-black bg-white px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase">design</span>
              </div>
              <div class="flex h-7 w-7 items-center justify-center border-2 border-black bg-[#FF4FA3] font-archivo text-[11px] font-extrabold text-white">JL</div>
            </div>
          </article>

          <article class="nb-card cursor-grab border-2 border-black bg-white p-3 shadow-[3px_3px_0_0_#000] transition-transform duration-100 hover:translate-x-[2px] hover:translate-y-[2px] hover:shadow-[1px_1px_0_0_#000] active:cursor-grabbing" draggable="true" tabindex="0">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="border-2 border-black bg-[#FF4FA3] px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase text-white">P2</span>
              <span class="font-mono text-[10px] font-bold uppercase text-black/50">SNIP-121</span>
            </div>
            <h4 class="font-archivo text-[14px] font-bold leading-snug">Research drag-drop a11y patterns</h4>
            <p class="mt-1 font-mono text-[11px] leading-snug text-black/60">Compare native DnD vs roving tabindex keyboards.</p>
            <div class="mt-2.5 flex items-center justify-between">
              <div class="flex items-center gap-1.5">
                <span class="border border-black bg-[#00E676] px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase">a11y</span>
                <span class="border border-black bg-white px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase">research</span>
              </div>
              <div class="flex h-7 w-7 items-center justify-center border-2 border-black bg-black font-archivo text-[11px] font-extrabold text-white">SK</div>
            </div>
          </article>
        </div>
        <button type="button" class="nb-add m-3 mt-0 flex w-[calc(100%-1.5rem)] items-center justify-center gap-1.5 border-2 border-black bg-white py-2 font-mono text-[11px] font-bold uppercase shadow-[2px_2px_0_0_#000] transition-transform duration-100 hover:translate-x-[2px] hover:translate-y-[2px] hover:shadow-none focus:outline-none focus-visible:ring-2 focus-visible:ring-black focus-visible:ring-offset-2">
          <svg class="h-3.5 w-3.5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="3" aria-hidden="true"><path d="M12 5v14M5 12h14" /></svg>
          Add card
        </button>
      </section>

      <!-- Column -->
      <section class="nb-col w-[280px] shrink-0 border-2 border-black bg-[#FFFDF5]" aria-label="In Progress">
        <header class="flex items-center justify-between border-b-2 border-black bg-[#00C2FF] px-3 py-2">
          <h3 class="font-archivo text-sm font-extrabold uppercase tracking-tight">In Progress</h3>
          <span class="nb-count border-2 border-black bg-white px-2 font-mono text-[11px] font-bold shadow-[2px_2px_0_0_#000]" data-count>2</span>
        </header>
        <div class="nb-list space-y-3 p-3" data-list>
          <article class="nb-card cursor-grab border-2 border-black bg-white p-3 shadow-[3px_3px_0_0_#000] transition-transform duration-100 hover:translate-x-[2px] hover:translate-y-[2px] hover:shadow-[1px_1px_0_0_#000] active:cursor-grabbing" draggable="true" tabindex="0">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="border-2 border-black bg-[#FF4FA3] px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase text-white">P1</span>
              <span class="font-mono text-[10px] font-bold uppercase text-black/50">SNIP-098</span>
            </div>
            <h4 class="font-archivo text-[14px] font-bold leading-snug">Ship kanban drag-and-drop widget</h4>
            <p class="mt-1 font-mono text-[11px] leading-snug text-black/60">HTML5 DnD, move cards across columns, update counts live.</p>
            <div class="mt-2.5 flex items-center justify-between">
              <div class="flex items-center gap-1.5">
                <span class="border border-black bg-[#FFE600] px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase">js</span>
                <span class="border border-black bg-white px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase">widget</span>
              </div>
              <div class="flex h-7 w-7 items-center justify-center border-2 border-black bg-[#00E676] font-archivo text-[11px] font-extrabold">AB</div>
            </div>
          </article>

          <article class="nb-card cursor-grab border-2 border-black bg-white p-3 shadow-[3px_3px_0_0_#000] transition-transform duration-100 hover:translate-x-[2px] hover:translate-y-[2px] hover:shadow-[1px_1px_0_0_#000] active:cursor-grabbing" draggable="true" tabindex="0">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="border-2 border-black bg-[#FFE600] px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase">P2</span>
              <span class="font-mono text-[10px] font-bold uppercase text-black/50">SNIP-110</span>
            </div>
            <h4 class="font-archivo text-[14px] font-bold leading-snug">Tokenize the 3-style palette</h4>
            <p class="mt-1 font-mono text-[11px] leading-snug text-black/60">Extract shared tokens so variants stay cohesive.</p>
            <div class="mt-2.5 flex items-center justify-between">
              <div class="flex items-center gap-1.5">
                <span class="border border-black bg-[#FF4FA3] px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase text-white">tokens</span>
              </div>
              <div class="flex h-7 w-7 items-center justify-center border-2 border-black bg-[#00C2FF] font-archivo text-[11px] font-extrabold">DT</div>
            </div>
          </article>
        </div>
        <button type="button" class="nb-add m-3 mt-0 flex w-[calc(100%-1.5rem)] items-center justify-center gap-1.5 border-2 border-black bg-white py-2 font-mono text-[11px] font-bold uppercase shadow-[2px_2px_0_0_#000] transition-transform duration-100 hover:translate-x-[2px] hover:translate-y-[2px] hover:shadow-none focus:outline-none focus-visible:ring-2 focus-visible:ring-black focus-visible:ring-offset-2">
          <svg class="h-3.5 w-3.5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="3" aria-hidden="true"><path d="M12 5v14M5 12h14" /></svg>
          Add card
        </button>
      </section>

      <!-- Column -->
      <section class="nb-col w-[280px] shrink-0 border-2 border-black bg-[#FFFDF5]" aria-label="Review">
        <header class="flex items-center justify-between border-b-2 border-black bg-[#FF4FA3] px-3 py-2">
          <h3 class="font-archivo text-sm font-extrabold uppercase tracking-tight text-white">Review</h3>
          <span class="nb-count border-2 border-black bg-white px-2 font-mono text-[11px] font-bold shadow-[2px_2px_0_0_#000]" data-count>1</span>
        </header>
        <div class="nb-list space-y-3 p-3" data-list>
          <article class="nb-card cursor-grab border-2 border-black bg-white p-3 shadow-[3px_3px_0_0_#000] transition-transform duration-100 hover:translate-x-[2px] hover:translate-y-[2px] hover:shadow-[1px_1px_0_0_#000] active:cursor-grabbing" draggable="true" tabindex="0">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="border-2 border-black bg-[#00E676] px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase">P3</span>
              <span class="font-mono text-[10px] font-bold uppercase text-black/50">SNIP-091</span>
            </div>
            <h4 class="font-archivo text-[14px] font-bold leading-snug">Audit focus rings across sections</h4>
            <p class="mt-1 font-mono text-[11px] leading-snug text-black/60">Ensure every interactive element has a visible focus-visible ring.</p>
            <div class="mt-2.5 flex items-center justify-between">
              <div class="flex items-center gap-1.5">
                <span class="border border-black bg-[#00E676] px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase">a11y</span>
                <span class="border border-black bg-white px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase">audit</span>
              </div>
              <div class="flex h-7 w-7 items-center justify-center border-2 border-black bg-[#FFE600] font-archivo text-[11px] font-extrabold">RM</div>
            </div>
          </article>
        </div>
        <button type="button" class="nb-add m-3 mt-0 flex w-[calc(100%-1.5rem)] items-center justify-center gap-1.5 border-2 border-black bg-white py-2 font-mono text-[11px] font-bold uppercase shadow-[2px_2px_0_0_#000] transition-transform duration-100 hover:translate-x-[2px] hover:translate-y-[2px] hover:shadow-none focus:outline-none focus-visible:ring-2 focus-visible:ring-black focus-visible:ring-offset-2">
          <svg class="h-3.5 w-3.5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="3" aria-hidden="true"><path d="M12 5v14M5 12h14" /></svg>
          Add card
        </button>
      </section>

      <!-- Column -->
      <section class="nb-col w-[280px] shrink-0 border-2 border-black bg-[#FFFDF5]" aria-label="Done">
        <header class="flex items-center justify-between border-b-2 border-black bg-[#00E676] px-3 py-2">
          <h3 class="font-archivo text-sm font-extrabold uppercase tracking-tight">Done</h3>
          <span class="nb-count border-2 border-black bg-white px-2 font-mono text-[11px] font-bold shadow-[2px_2px_0_0_#000]" data-count>2</span>
        </header>
        <div class="nb-list space-y-3 p-3" data-list>
          <article class="nb-card cursor-grab border-2 border-black bg-white p-3 shadow-[3px_3px_0_0_#000] transition-transform duration-100 hover:translate-x-[2px] hover:translate-y-[2px] hover:shadow-[1px_1px_0_0_#000] active:cursor-grabbing" draggable="true" tabindex="0">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="border-2 border-black bg-[#00C2FF] px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase">P3</span>
              <span class="font-mono text-[10px] font-bold uppercase text-black/50">SNIP-087</span>
            </div>
            <h4 class="font-archivo text-[14px] font-bold leading-snug line-through decoration-black decoration-2">Set up CDN + fonts scaffold</h4>
            <p class="mt-1 font-mono text-[11px] leading-snug text-black/60">Tailwind play CDN + Google Fonts across variants.</p>
            <div class="mt-2.5 flex items-center justify-between">
              <div class="flex items-center gap-1.5">
                <span class="border border-black bg-[#FFE600] px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase">infra</span>
              </div>
              <div class="flex h-7 w-7 items-center justify-center border-2 border-black bg-[#FF4FA3] font-archivo text-[11px] font-extrabold text-white">JL</div>
            </div>
          </article>

          <article class="nb-card cursor-grab border-2 border-black bg-white p-3 shadow-[3px_3px_0_0_#000] transition-transform duration-100 hover:translate-x-[2px] hover:translate-y-[2px] hover:shadow-[1px_1px_0_0_#000] active:cursor-grabbing" draggable="true" tabindex="0">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="border-2 border-black bg-[#00E676] px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase">P3</span>
              <span class="font-mono text-[10px] font-bold uppercase text-black/50">SNIP-074</span>
            </div>
            <h4 class="font-archivo text-[14px] font-bold leading-snug line-through decoration-black decoration-2">Write STYLE_TOKENS reference</h4>
            <p class="mt-1 font-mono text-[11px] leading-snug text-black/60">Canonical token doc for all three design styles.</p>
            <div class="mt-2.5 flex items-center justify-between">
              <div class="flex items-center gap-1.5">
                <span class="border border-black bg-white px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase">docs</span>
              </div>
              <div class="flex h-7 w-7 items-center justify-center border-2 border-black bg-black font-archivo text-[11px] font-extrabold text-white">SK</div>
            </div>
          </article>
        </div>
        <button type="button" class="nb-add m-3 mt-0 flex w-[calc(100%-1.5rem)] items-center justify-center gap-1.5 border-2 border-black bg-white py-2 font-mono text-[11px] font-bold uppercase shadow-[2px_2px_0_0_#000] transition-transform duration-100 hover:translate-x-[2px] hover:translate-y-[2px] hover:shadow-none focus:outline-none focus-visible:ring-2 focus-visible:ring-black focus-visible:ring-offset-2">
          <svg class="h-3.5 w-3.5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="3" aria-hidden="true"><path d="M12 5v14M5 12h14" /></svg>
          Add card
        </button>
      </section>

    </div>
  </div>

  <style>
    [data-board="nb"] .nb-list { min-height: 56px; transition: background-color .12s ease; }
    [data-board="nb"] .nb-list.nb-over { background-color: rgba(255, 230, 0, 0.35); outline: 2px dashed #000; outline-offset: -2px; }
    [data-board="nb"] .nb-card.nb-drag { opacity: .4; }
    [data-board="nb"] .nb-card.nb-focus:focus { outline: 2px solid #000; outline-offset: 2px; }
    [data-board="nb"] .nb-placeholder { border: 2px dashed #000; background: rgba(0,0,0,0.04); height: 84px; }
    [data-board="nb"] .board-cols { scrollbar-width: thin; scrollbar-color: #000 transparent; }
    [data-board="nb"] .board-cols::-webkit-scrollbar { height: 10px; }
    [data-board="nb"] .board-cols::-webkit-scrollbar-track { background: #FFFDF5; border-top: 2px solid #000; }
    [data-board="nb"] .board-cols::-webkit-scrollbar-thumb { background: #000; }
    [data-board="nb"] .nb-list::-webkit-scrollbar { width: 8px; }
    [data-board="nb"] .nb-list::-webkit-scrollbar-thumb { background: #000; }
  </style>

  <script>
    (function () {
      var root = document.currentScript.closest('[data-board="nb"]');
      if (!root) return;
      var cols = root.querySelectorAll('[data-list]');
      var dragged = null;
      var placeholder = null;
      var uid = 0;

      function updateCounts() {
        root.querySelectorAll('.nb-col').forEach(function (col) {
          var count = col.querySelector('[data-list]').children.length;
          var badge = col.querySelector('[data-count]');
          if (badge) badge.textContent = count;
        });
      }

      function findCard(node) {
        return node && (node.closest ? node.closest('.nb-card') : null);
      }

      function makePlaceholder() {
        var p = document.createElement('div');
        p.className = 'nb-placeholder';
        return p;
      }

      function clearOver() {
        cols.forEach(function (l) { l.classList.remove('nb-over'); });
      }

      function attachCard(card) {
        card.addEventListener('dragstart', function (e) {
          dragged = card;
          card.classList.add('nb-drag');
          if (e.dataTransfer) {
            e.dataTransfer.effectAllowed = 'move';
            try { e.dataTransfer.setData('text/plain', card.dataset.id || ''); } catch (err) {}
          }
          placeholder = makePlaceholder();
          if (card.parentNode) card.parentNode.insertBefore(placeholder, card.nextSibling);
        });
        card.addEventListener('dragend', function () {
          card.classList.remove('nb-drag');
          if (placeholder && placeholder.parentNode) placeholder.parentNode.removeChild(placeholder);
          placeholder = null;
          dragged = null;
          clearOver();
          updateCounts();
        });
      }

      root.querySelectorAll('.nb-card').forEach(attachCard);

      cols.forEach(function (list) {
        list.addEventListener('dragover', function (e) {
          e.preventDefault();
          if (e.dataTransfer) e.dataTransfer.dropEffect = 'move';
          list.classList.add('nb-over');
          if (!dragged || !placeholder) return;
          var after = null;
          var cards = list.querySelectorAll('.nb-card:not(.nb-drag)');
          Array.prototype.forEach.call(cards, function (c) {
            var r = c.getBoundingClientRect();
            if (e.clientY < r.top + r.height / 2) { after = c; }
          });
          if (after) { list.insertBefore(placeholder, after); }
          else if (list !== dragged.parentNode || list.lastElementChild !== placeholder) { list.appendChild(placeholder); }
        });

        list.addEventListener('dragleave', function (e) {
          if (!list.contains(e.relatedTarget)) list.classList.remove('nb-over');
        });

        list.addEventListener('drop', function (e) {
          e.preventDefault();
          if (dragged && placeholder && placeholder.parentNode === list) {
            list.insertBefore(dragged, placeholder);
            if (placeholder.parentNode) placeholder.parentNode.removeChild(placeholder);
          } else if (dragged) {
            list.appendChild(dragged);
          }
          placeholder = null;
          dragged = null;
          clearOver();
          updateCounts();
        });
      });

      // Add-card affordance
      var palettes = ['#FF4FA3', '#FFE600', '#00C2FF', '#00E676'];
      var avatars = ['AB', 'CD', 'EF', 'GH', 'JK', 'MN'];
      root.querySelectorAll('.nb-add').forEach(function (btn) {
        btn.addEventListener('click', function () {
          var col = btn.closest('.nb-col');
          var list = col.querySelector('[data-list]');
          uid += 1;
          var id = 'SNIP-' + (200 + uid);
          var pri = palettes[uid % palettes.length];
          var dark = pri === '#FFE600' || pri === '#00C2FF' || pri === '#00E676';
          var card = document.createElement('article');
          card.className = 'nb-card cursor-grab border-2 border-black bg-white p-3 shadow-[3px_3px_0_0_#000] transition-transform duration-100 hover:translate-x-[2px] hover:translate-y-[2px] hover:shadow-[1px_1px_0_0_#000] active:cursor-grabbing';
          card.setAttribute('draggable', 'true');
          card.setAttribute('tabindex', '0');
          card.dataset.id = id;
          card.innerHTML =
            '<div class="mb-2 flex items-center justify-between gap-2">' +
            '<span class="border-2 border-black px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase ' + (dark ? 'text-black' : 'text-white') + '" style="background:' + pri + '">P2</span>' +
            '<span class="font-mono text-[10px] font-bold uppercase text-black/50">' + id + '</span>' +
            '</div>' +
            '<h4 class="font-archivo text-[14px] font-bold leading-snug">New task — define the next step</h4>' +
            '<p class="mt-1 font-mono text-[11px] leading-snug text-black/60">Click to flesh out details, owners, and tags.</p>' +
            '<div class="mt-2.5 flex items-center justify-between">' +
            '<div class="flex items-center gap-1.5"><span class="border border-black bg-white px-1.5 py-0.5 font-mono text-[10px] font-bold uppercase">new</span></div>' +
            '<div class="flex h-7 w-7 items-center justify-center border-2 border-black bg-[#FFE600] font-archivo text-[11px] font-extrabold">' + avatars[uid % avatars.length] + '</div>' +
            '</div>';
          list.appendChild(card);
          attachCard(card);
          updateCounts();
          card.focus();
        });
      });

      // Keyboard reordering: ArrowUp/Down moves within a column,
      // ArrowLeft/Right moves the card to the previous/next column.
      // Reuses the same DOM-move + updateCounts() logic as drag-and-drop.
      root.querySelectorAll('.nb-card').forEach(function (card) {
        card.addEventListener('keydown', function (e) {
          var list = card.parentNode;
          if (!list || !list.hasAttribute('data-list')) return;
          var colsArr = Array.prototype.slice.call(cols);
          var colIdx = colsArr.indexOf(list);
          var cards = Array.prototype.slice.call(list.querySelectorAll('.nb-card'));
          var idx = cards.indexOf(card);
          function moveTo(targetList) {
            targetList.appendChild(card); updateCounts(); card.focus();
          }
          switch (e.key) {
            case 'ArrowUp':
              e.preventDefault();
              if (idx > 0) { list.insertBefore(card, cards[idx - 1]); updateCounts(); card.focus(); }
              break;
            case 'ArrowDown':
              e.preventDefault();
              if (idx < cards.length - 1) { list.insertBefore(card, cards[idx + 1].nextSibling); updateCounts(); card.focus(); }
              break;
            case 'ArrowLeft':
              e.preventDefault();
              if (colIdx > 0) { moveTo(colsArr[colIdx - 1]); }
              break;
            case 'ArrowRight':
              e.preventDefault();
              if (colIdx < colsArr.length - 1) { moveTo(colsArr[colIdx + 1]); }
              break;
          }
        });
      });
      updateCounts();
    })();
  </script>
</div>