Kanban Board — Vercel

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<!--
Snippet Name: Kanban Board — Vercel
Description: Dark monochrome kanban board with hairline borders, a glowing teal status, count pills, draggable task cards (HTML5 DnD), and an add-card affordance per column.
Author: DevSnips Contributors
Usage Example: Drop into a dark product 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="vc">

  <!-- Board panel -->
  <div class="overflow-hidden rounded-[14px] border border-white/10 bg-[#0a0a0a] shadow-[0_0_0_1px_rgba(255,255,255,0.02),0_20px_60px_-20px_rgba(0,0,0,0.9)]">
    <div class="pointer-events-none absolute -inset-px -z-10 rounded-[14px] opacity-60 [background:radial-gradient(60%_60%_at_50%_0%,rgba(255,255,255,0.10),transparent_70%)]" aria-hidden="true"></div>

    <div class="board-cols flex gap-4 overflow-x-auto p-4 sm:p-5" data-board-cols>

      <!-- Column -->
      <section class="vc-col w-[280px] shrink-0 rounded-xl border border-white/10 bg-white/[0.02]" aria-label="Backlog">
        <header class="flex items-center justify-between border-b border-white/[0.07] px-3.5 py-2.5">
          <div class="flex items-center gap-2">
            <span class="vc-dot"></span>
            <h3 class="font-g text-[13px] font-medium text-white">Backlog</h3>
          </div>
          <span class="vc-count vc-mono rounded-full border border-white/10 bg-white/[0.05] px-2 py-0.5 text-[11px] text-white/55" data-count>3</span>
        </header>
        <div class="vc-list space-y-2.5 p-2.5" data-list>
          <article class="vc-card group cursor-grab rounded-lg border border-white/10 bg-[#0a0a0a] p-3 transition-colors hover:border-white/20 active:cursor-grabbing" draggable="true" tabindex="0" data-id="SNIP-104">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="vc-mono rounded-md border border-white/10 bg-white/[0.06] px-1.5 py-0.5 text-[10px] font-medium uppercase text-white/80">P1</span>
              <span class="vc-mono text-[10px] text-white/35">SNIP-104</span>
            </div>
            <h4 class="font-g text-[13.5px] font-medium leading-snug text-white">Wire dark-mode toggle to root class</h4>
            <p class="mt-1 font-g text-[12px] leading-relaxed text-white/45">Persist choice in localStorage and reflect on first paint.</p>
            <div class="mt-3 flex items-center justify-between">
              <div class="flex flex-wrap items-center gap-1">
                <span class="vc-code">css</span>
                <span class="vc-code">a11y</span>
              </div>
              <div class="flex h-6 w-6 items-center justify-center rounded-full border border-white/10 bg-white/[0.06] vc-mono text-[10px] font-medium text-white/80">RM</div>
            </div>
          </article>

          <article class="vc-card group cursor-grab rounded-lg border border-white/10 bg-[#0a0a0a] p-3 transition-colors hover:border-white/20 active:cursor-grabbing" draggable="true" tabindex="0" data-id="SNIP-118">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="vc-mono rounded-md border border-white/10 bg-white/[0.06] px-1.5 py-0.5 text-[10px] font-medium uppercase text-white/80">P3</span>
              <span class="vc-mono text-[10px] text-white/35">SNIP-118</span>
            </div>
            <h4 class="font-g text-[13.5px] font-medium leading-snug text-white">Sketch onboarding empty state</h4>
            <p class="mt-1 font-g text-[12px] leading-relaxed text-white/45">Three steps with inline illustrations and a CTA.</p>
            <div class="mt-3 flex items-center justify-between">
              <div class="flex flex-wrap items-center gap-1">
                <span class="vc-code">design</span>
              </div>
              <div class="flex h-6 w-6 items-center justify-center rounded-full border border-white/10 bg-white/[0.06] vc-mono text-[10px] font-medium text-white/80">JL</div>
            </div>
          </article>

          <article class="vc-card group cursor-grab rounded-lg border border-white/10 bg-[#0a0a0a] p-3 transition-colors hover:border-white/20 active:cursor-grabbing" draggable="true" tabindex="0" data-id="SNIP-121">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="vc-mono rounded-md border border-white/10 bg-white/[0.06] px-1.5 py-0.5 text-[10px] font-medium uppercase text-white/80">P2</span>
              <span class="vc-mono text-[10px] text-white/35">SNIP-121</span>
            </div>
            <h4 class="font-g text-[13.5px] font-medium leading-snug text-white">Research drag-drop a11y patterns</h4>
            <p class="mt-1 font-g text-[12px] leading-relaxed text-white/45">Compare native DnD vs roving tabindex keyboards.</p>
            <div class="mt-3 flex items-center justify-between">
              <div class="flex flex-wrap items-center gap-1">
                <span class="vc-code">a11y</span>
                <span class="vc-code">research</span>
              </div>
              <div class="flex h-6 w-6 items-center justify-center rounded-full border border-white/10 bg-white/[0.06] vc-mono text-[10px] font-medium text-white/80">SK</div>
            </div>
          </article>
        </div>
        <button type="button" class="vc-add m-2.5 mt-0 flex w-[calc(100%-1.25rem)] items-center justify-center gap-1.5 rounded-lg border border-dashed border-white/10 bg-transparent py-2 vc-mono text-[11px] text-white/45 transition-colors hover:border-white/20 hover:text-white focus:outline-none focus-visible:ring-2 focus-visible:ring-white/30">
          <svg class="h-3.5 w-3.5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true"><path d="M12 5v14M5 12h14" /></svg>
          Add card
        </button>
      </section>

      <!-- Column -->
      <section class="vc-col w-[280px] shrink-0 rounded-xl border border-white/10 bg-white/[0.02]" aria-label="In Progress">
        <header class="flex items-center justify-between border-b border-white/[0.07] px-3.5 py-2.5">
          <div class="flex items-center gap-2">
            <span class="vc-dot"></span>
            <h3 class="font-g text-[13px] font-medium text-white">In Progress</h3>
          </div>
          <span class="vc-count vc-mono rounded-full border border-white/10 bg-white/[0.05] px-2 py-0.5 text-[11px] text-white/55" data-count>2</span>
        </header>
        <div class="vc-list space-y-2.5 p-2.5" data-list>
          <article class="vc-card group cursor-grab rounded-lg border border-white/10 bg-[#0a0a0a] p-3 transition-colors hover:border-white/20 active:cursor-grabbing" draggable="true" tabindex="0" data-id="SNIP-098">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="vc-mono rounded-md border border-white/10 bg-white/[0.06] px-1.5 py-0.5 text-[10px] font-medium uppercase text-white/80">P1</span>
              <span class="vc-mono text-[10px] text-white/35">SNIP-098</span>
            </div>
            <h4 class="font-g text-[13.5px] font-medium leading-snug text-white">Ship kanban drag-and-drop widget</h4>
            <p class="mt-1 font-g text-[12px] leading-relaxed text-white/45">HTML5 DnD, move cards across columns, update counts live.</p>
            <div class="mt-3 flex items-center justify-between">
              <div class="flex flex-wrap items-center gap-1">
                <span class="vc-code">js</span>
                <span class="vc-code">widget</span>
              </div>
              <div class="flex h-6 w-6 items-center justify-center rounded-full border border-white/10 bg-white/[0.06] vc-mono text-[10px] font-medium text-white/80">AB</div>
            </div>
          </article>

          <article class="vc-card group cursor-grab rounded-lg border border-white/10 bg-[#0a0a0a] p-3 transition-colors hover:border-white/20 active:cursor-grabbing" draggable="true" tabindex="0" data-id="SNIP-110">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="vc-mono rounded-md border border-white/10 bg-white/[0.06] px-1.5 py-0.5 text-[10px] font-medium uppercase text-white/80">P2</span>
              <span class="vc-mono text-[10px] text-white/35">SNIP-110</span>
            </div>
            <h4 class="font-g text-[13.5px] font-medium leading-snug text-white">Tokenize the 3-style palette</h4>
            <p class="mt-1 font-g text-[12px] leading-relaxed text-white/45">Extract shared tokens so variants stay cohesive.</p>
            <div class="mt-3 flex items-center justify-between">
              <div class="flex flex-wrap items-center gap-1">
                <span class="vc-code">tokens</span>
              </div>
              <div class="flex h-6 w-6 items-center justify-center rounded-full border border-white/10 bg-white/[0.06] vc-mono text-[10px] font-medium text-white/80">DT</div>
            </div>
          </article>
        </div>
        <button type="button" class="vc-add m-2.5 mt-0 flex w-[calc(100%-1.25rem)] items-center justify-center gap-1.5 rounded-lg border border-dashed border-white/10 bg-transparent py-2 vc-mono text-[11px] text-white/45 transition-colors hover:border-white/20 hover:text-white focus:outline-none focus-visible:ring-2 focus-visible:ring-white/30">
          <svg class="h-3.5 w-3.5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true"><path d="M12 5v14M5 12h14" /></svg>
          Add card
        </button>
      </section>

      <!-- Column -->
      <section class="vc-col w-[280px] shrink-0 rounded-xl border border-white/10 bg-white/[0.02]" aria-label="Review">
        <header class="flex items-center justify-between border-b border-white/[0.07] px-3.5 py-2.5">
          <div class="flex items-center gap-2">
            <span class="vc-dot"></span>
            <h3 class="font-g text-[13px] font-medium text-white">Review</h3>
          </div>
          <span class="vc-count vc-mono rounded-full border border-white/10 bg-white/[0.05] px-2 py-0.5 text-[11px] text-white/55" data-count>1</span>
        </header>
        <div class="vc-list space-y-2.5 p-2.5" data-list>
          <article class="vc-card group cursor-grab rounded-lg border border-white/10 bg-[#0a0a0a] p-3 transition-colors hover:border-white/20 active:cursor-grabbing" draggable="true" tabindex="0" data-id="SNIP-091">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="vc-mono rounded-md border border-white/10 bg-white/[0.06] px-1.5 py-0.5 text-[10px] font-medium uppercase text-white/80">P3</span>
              <span class="vc-mono text-[10px] text-white/35">SNIP-091</span>
            </div>
            <h4 class="font-g text-[13.5px] font-medium leading-snug text-white">Audit focus rings across sections</h4>
            <p class="mt-1 font-g text-[12px] leading-relaxed text-white/45">Ensure every interactive element has a visible focus-visible ring.</p>
            <div class="mt-3 flex items-center justify-between">
              <div class="flex flex-wrap items-center gap-1">
                <span class="vc-code">a11y</span>
                <span class="vc-code">audit</span>
              </div>
              <div class="flex h-6 w-6 items-center justify-center rounded-full border border-white/10 bg-white/[0.06] vc-mono text-[10px] font-medium text-white/80">RM</div>
            </div>
          </article>
        </div>
        <button type="button" class="vc-add m-2.5 mt-0 flex w-[calc(100%-1.25rem)] items-center justify-center gap-1.5 rounded-lg border border-dashed border-white/10 bg-transparent py-2 vc-mono text-[11px] text-white/45 transition-colors hover:border-white/20 hover:text-white focus:outline-none focus-visible:ring-2 focus-visible:ring-white/30">
          <svg class="h-3.5 w-3.5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true"><path d="M12 5v14M5 12h14" /></svg>
          Add card
        </button>
      </section>

      <!-- Column -->
      <section class="vc-col w-[280px] shrink-0 rounded-xl border border-white/10 bg-white/[0.02]" aria-label="Done">
        <header class="flex items-center justify-between border-b border-white/[0.07] px-3.5 py-2.5">
          <div class="flex items-center gap-2">
            <span class="vc-dot"></span>
            <h3 class="font-g text-[13px] font-medium text-white/60">Done</h3>
          </div>
          <span class="vc-count vc-mono rounded-full border border-white/10 bg-white/[0.05] px-2 py-0.5 text-[11px] text-white/55" data-count>2</span>
        </header>
        <div class="vc-list space-y-2.5 p-2.5" data-list>
          <article class="vc-card group cursor-grab rounded-lg border border-white/10 bg-[#0a0a0a] p-3 transition-colors hover:border-white/20 active:cursor-grabbing" draggable="true" tabindex="0" data-id="SNIP-087">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="vc-mono rounded-md border border-white/10 bg-white/[0.06] px-1.5 py-0.5 text-[10px] font-medium uppercase text-white/80">P3</span>
              <span class="vc-mono text-[10px] text-white/35">SNIP-087</span>
            </div>
            <h4 class="font-g text-[13.5px] font-medium leading-snug text-white/55 line-through decoration-white/30">Set up CDN + fonts scaffold</h4>
            <p class="mt-1 font-g text-[12px] leading-relaxed text-white/35">Tailwind play CDN + Google Fonts across variants.</p>
            <div class="mt-3 flex items-center justify-between">
              <div class="flex flex-wrap items-center gap-1">
                <span class="vc-code">infra</span>
              </div>
              <div class="flex h-6 w-6 items-center justify-center rounded-full border border-white/10 bg-white/[0.06] vc-mono text-[10px] font-medium text-white/80">JL</div>
            </div>
          </article>

          <article class="vc-card group cursor-grab rounded-lg border border-white/10 bg-[#0a0a0a] p-3 transition-colors hover:border-white/20 active:cursor-grabbing" draggable="true" tabindex="0" data-id="SNIP-074">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="vc-mono rounded-md border border-white/10 bg-white/[0.06] px-1.5 py-0.5 text-[10px] font-medium uppercase text-white/80">P3</span>
              <span class="vc-mono text-[10px] text-white/35">SNIP-074</span>
            </div>
            <h4 class="font-g text-[13.5px] font-medium leading-snug text-white/55 line-through decoration-white/30">Write STYLE_TOKENS reference</h4>
            <p class="mt-1 font-g text-[12px] leading-relaxed text-white/35">Canonical token doc for all three design styles.</p>
            <div class="mt-3 flex items-center justify-between">
              <div class="flex flex-wrap items-center gap-1">
                <span class="vc-code">docs</span>
              </div>
              <div class="flex h-6 w-6 items-center justify-center rounded-full border border-white/10 bg-white/[0.06] vc-mono text-[10px] font-medium text-white/80">SK</div>
            </div>
          </article>
        </div>
        <button type="button" class="vc-add m-2.5 mt-0 flex w-[calc(100%-1.25rem)] items-center justify-center gap-1.5 rounded-lg border border-dashed border-white/10 bg-transparent py-2 vc-mono text-[11px] text-white/45 transition-colors hover:border-white/20 hover:text-white focus:outline-none focus-visible:ring-2 focus-visible:ring-white/30">
          <svg class="h-3.5 w-3.5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true"><path d="M12 5v14M5 12h14" /></svg>
          Add card
        </button>
      </section>

    </div>
  </div>

  <style>
    [data-board="vc"] .vc-mono { font-family: 'Geist Mono', ui-monospace, monospace; }
    [data-board="vc"] .font-g { font-family: 'Geist', sans-serif; }
    [data-board="vc"] .vc-code { font-family: 'Geist Mono', monospace; font-size: 11px; background: rgba(255,255,255,0.06); padding: 1px 6px; border-radius: 5px; color: rgba(255,255,255,0.75); }
    [data-board="vc"] .vc-dot { display: inline-block; height: 6px; width: 6px; border-radius: 9999px; background: #50e3c2; box-shadow: 0 0 8px #50e3c2; vertical-align: middle; }
    [data-board="vc"] .vc-list { min-height: 48px; transition: background-color .12s ease; border-radius: 8px; }
    [data-board="vc"] .vc-list.vc-over { background-color: rgba(80, 227, 194, 0.06); outline: 1px dashed rgba(80,227,194,0.5); outline-offset: -2px; }
    [data-board="vc"] .vc-card.vc-drag { opacity: .35; }
    [data-board="vc"] .vc-card:focus { outline: 2px solid rgba(255,255,255,0.4); outline-offset: 2px; }
    [data-board="vc"] .vc-placeholder { border: 1px dashed rgba(255,255,255,0.25); background: rgba(255,255,255,0.03); height: 78px; border-radius: 8px; }
    [data-board="vc"] .board-cols { scrollbar-width: thin; scrollbar-color: rgba(255,255,255,0.15) transparent; }
    [data-board="vc"] .board-cols::-webkit-scrollbar { height: 8px; }
    [data-board="vc"] .board-cols::-webkit-scrollbar-track { background: transparent; }
    [data-board="vc"] .board-cols::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 9999px; }
  </style>

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

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

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

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

      function attachCard(card) {
        card.addEventListener('dragstart', function (e) {
          dragged = card;
          card.classList.add('vc-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('vc-drag');
          if (placeholder && placeholder.parentNode) placeholder.parentNode.removeChild(placeholder);
          placeholder = null;
          dragged = null;
          clearOver();
          updateCounts();
        });
      }

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

      cols.forEach(function (list) {
        list.addEventListener('dragover', function (e) {
          e.preventDefault();
          if (e.dataTransfer) e.dataTransfer.dropEffect = 'move';
          list.classList.add('vc-over');
          if (!dragged || !placeholder) return;
          var after = null;
          var cards = list.querySelectorAll('.vc-card:not(.vc-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('vc-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();
        });
      });

      var avatars = ['AB', 'CD', 'EF', 'GH', 'JK', 'MN'];
      root.querySelectorAll('.vc-add').forEach(function (btn) {
        btn.addEventListener('click', function () {
          var col = btn.closest('.vc-col');
          var list = col.querySelector('[data-list]');
          uid += 1;
          var id = 'SNIP-' + (200 + uid);
          var card = document.createElement('article');
          card.className = 'vc-card group cursor-grab rounded-lg border border-white/10 bg-[#0a0a0a] p-3 transition-colors hover:border-white/20 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="vc-mono rounded-md border border-white/10 bg-white/[0.06] px-1.5 py-0.5 text-[10px] font-medium uppercase text-white/80">P2</span>' +
            '<span class="vc-mono text-[10px] text-white/35">' + id + '</span>' +
            '</div>' +
            '<h4 class="font-g text-[13.5px] font-medium leading-snug text-white">New task — define the next step</h4>' +
            '<p class="mt-1 font-g text-[12px] leading-relaxed text-white/45">Click to flesh out details, owners, and tags.</p>' +
            '<div class="mt-3 flex items-center justify-between">' +
            '<div class="flex flex-wrap items-center gap-1"><span class="vc-code">new</span></div>' +
            '<div class="flex h-6 w-6 items-center justify-center rounded-full border border-white/10 bg-white/[0.06] vc-mono text-[10px] font-medium text-white/80">' + 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('.vc-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('.vc-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>