Kanban Board — Sharp Glassmorphism

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378

<!--
Snippet Name: Kanban Board — Sharp Glassmorphism
Description: Frosted-glass kanban board over a vibrant gradient mesh, with glowing dots, count chips, draggable task cards (HTML5 DnD), and an add-card affordance per column.
Author: DevSnips Contributors
Usage Example: Drop into a vivid app shell as a project board widget. Drag cards between columns and click "+ Add card" to create new tasks. Fully wired in preview.html. Requires a colored backdrop behind the board for the glass to read.
-->
<div class="relative w-full" data-board="sg">

  <!-- Glass board -->
  <div class="relative overflow-hidden rounded-2xl border border-white/20 bg-white/10 p-4 shadow-[0_8px_40px_-12px_rgba(99,102,241,0.45)] backdrop-blur-2xl sm:p-5">
    <!-- Top highlight -->
    <div class="pointer-events-none absolute inset-x-0 top-0 h-px bg-gradient-to-r from-transparent via-white/50 to-transparent" aria-hidden="true"></div>

    <div class="board-cols flex gap-4 overflow-x-auto pb-2" data-board-cols>

      <!-- Column -->
      <section class="sg-col w-[280px] shrink-0 rounded-xl border border-white/20 bg-white/10 backdrop-blur-md" aria-label="Backlog">
        <header class="flex items-center justify-between border-b border-white/15 px-3.5 py-2.5">
          <div class="flex items-center gap-2">
            <span class="sg-dot"></span>
            <h3 class="font-sora text-[13px] font-semibold text-white">Backlog</h3>
          </div>
          <span class="sg-count sg-mono rounded-full border border-white/20 bg-white/15 px-2 py-0.5 text-[11px] text-white backdrop-blur" data-count>3</span>
        </header>
        <div class="sg-list space-y-3 p-2.5" data-list>
          <article class="sg-card group cursor-grab rounded-xl border border-white/20 bg-white/15 p-3 backdrop-blur transition-colors hover:bg-white/25 active:cursor-grabbing" draggable="true" tabindex="0" data-id="SNIP-104">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="sg-mono rounded-md border border-white/30 bg-gradient-to-r from-fuchsia-500 to-pink-500 px-1.5 py-0.5 text-[10px] font-medium uppercase text-white">P1</span>
              <span class="sg-mono text-[10px] text-white/55">SNIP-104</span>
            </div>
            <h4 class="font-sora text-[13.5px] font-semibold leading-snug text-white">Wire dark-mode toggle to root class</h4>
            <p class="mt-1 font-sora text-[12px] leading-relaxed text-white/70">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="sg-code">css</span>
                <span class="sg-code">a11y</span>
              </div>
              <div class="sg-glow flex h-6 w-6 items-center justify-center rounded-full border border-white/30 bg-white/25 font-sora text-[10px] font-semibold text-white backdrop-blur">RM</div>
            </div>
          </article>

          <article class="sg-card group cursor-grab rounded-xl border border-white/20 bg-white/15 p-3 backdrop-blur transition-colors hover:bg-white/25 active:cursor-grabbing" draggable="true" tabindex="0" data-id="SNIP-118">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="sg-mono rounded-md border border-white/30 bg-white/15 px-1.5 py-0.5 text-[10px] font-medium uppercase text-white backdrop-blur">P3</span>
              <span class="sg-mono text-[10px] text-white/55">SNIP-118</span>
            </div>
            <h4 class="font-sora text-[13.5px] font-semibold leading-snug text-white">Sketch onboarding empty state</h4>
            <p class="mt-1 font-sora text-[12px] leading-relaxed text-white/70">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="sg-code">design</span>
              </div>
              <div class="sg-glow flex h-6 w-6 items-center justify-center rounded-full border border-white/30 bg-white/25 font-sora text-[10px] font-semibold text-white backdrop-blur">JL</div>
            </div>
          </article>

          <article class="sg-card group cursor-grab rounded-xl border border-white/20 bg-white/15 p-3 backdrop-blur transition-colors hover:bg-white/25 active:cursor-grabbing" draggable="true" tabindex="0" data-id="SNIP-121">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="sg-mono rounded-md border border-white/30 bg-gradient-to-r from-indigo-500 to-violet-500 px-1.5 py-0.5 text-[10px] font-medium uppercase text-white">P2</span>
              <span class="sg-mono text-[10px] text-white/55">SNIP-121</span>
            </div>
            <h4 class="font-sora text-[13.5px] font-semibold leading-snug text-white">Research drag-drop a11y patterns</h4>
            <p class="mt-1 font-sora text-[12px] leading-relaxed text-white/70">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="sg-code">a11y</span>
                <span class="sg-code">research</span>
              </div>
              <div class="sg-glow flex h-6 w-6 items-center justify-center rounded-full border border-white/30 bg-white/25 font-sora text-[10px] font-semibold text-white backdrop-blur">SK</div>
            </div>
          </article>
        </div>
        <button type="button" class="sg-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/25 bg-white/5 py-2 sg-mono text-[11px] text-white/75 backdrop-blur transition-colors hover:bg-white/15 hover:text-white focus:outline-none focus-visible:ring-2 focus-visible:ring-white/60">
          <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="sg-col w-[280px] shrink-0 rounded-xl border border-white/20 bg-white/10 backdrop-blur-md" aria-label="In Progress">
        <header class="flex items-center justify-between border-b border-white/15 px-3.5 py-2.5">
          <div class="flex items-center gap-2">
            <span class="sg-dot"></span>
            <h3 class="font-sora text-[13px] font-semibold text-white">In Progress</h3>
          </div>
          <span class="sg-count sg-mono rounded-full border border-white/20 bg-white/15 px-2 py-0.5 text-[11px] text-white backdrop-blur" data-count>2</span>
        </header>
        <div class="sg-list space-y-3 p-2.5" data-list>
          <article class="sg-card group cursor-grab rounded-xl border border-white/20 bg-white/15 p-3 backdrop-blur transition-colors hover:bg-white/25 active:cursor-grabbing" draggable="true" tabindex="0" data-id="SNIP-098">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="sg-mono rounded-md border border-white/30 bg-gradient-to-r from-fuchsia-500 to-pink-500 px-1.5 py-0.5 text-[10px] font-medium uppercase text-white">P1</span>
              <span class="sg-mono text-[10px] text-white/55">SNIP-098</span>
            </div>
            <h4 class="font-sora text-[13.5px] font-semibold leading-snug text-white">Ship kanban drag-and-drop widget</h4>
            <p class="mt-1 font-sora text-[12px] leading-relaxed text-white/70">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="sg-code">js</span>
                <span class="sg-code">widget</span>
              </div>
              <div class="sg-glow flex h-6 w-6 items-center justify-center rounded-full border border-white/30 bg-white/25 font-sora text-[10px] font-semibold text-white backdrop-blur">AB</div>
            </div>
          </article>

          <article class="sg-card group cursor-grab rounded-xl border border-white/20 bg-white/15 p-3 backdrop-blur transition-colors hover:bg-white/25 active:cursor-grabbing" draggable="true" tabindex="0" data-id="SNIP-110">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="sg-mono rounded-md border border-white/30 bg-gradient-to-r from-indigo-500 to-violet-500 px-1.5 py-0.5 text-[10px] font-medium uppercase text-white">P2</span>
              <span class="sg-mono text-[10px] text-white/55">SNIP-110</span>
            </div>
            <h4 class="font-sora text-[13.5px] font-semibold leading-snug text-white">Tokenize the 3-style palette</h4>
            <p class="mt-1 font-sora text-[12px] leading-relaxed text-white/70">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="sg-code">tokens</span>
              </div>
              <div class="sg-glow flex h-6 w-6 items-center justify-center rounded-full border border-white/30 bg-white/25 font-sora text-[10px] font-semibold text-white backdrop-blur">DT</div>
            </div>
          </article>
        </div>
        <button type="button" class="sg-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/25 bg-white/5 py-2 sg-mono text-[11px] text-white/75 backdrop-blur transition-colors hover:bg-white/15 hover:text-white focus:outline-none focus-visible:ring-2 focus-visible:ring-white/60">
          <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="sg-col w-[280px] shrink-0 rounded-xl border border-white/20 bg-white/10 backdrop-blur-md" aria-label="Review">
        <header class="flex items-center justify-between border-b border-white/15 px-3.5 py-2.5">
          <div class="flex items-center gap-2">
            <span class="sg-dot"></span>
            <h3 class="font-sora text-[13px] font-semibold text-white">Review</h3>
          </div>
          <span class="sg-count sg-mono rounded-full border border-white/20 bg-white/15 px-2 py-0.5 text-[11px] text-white backdrop-blur" data-count>1</span>
        </header>
        <div class="sg-list space-y-3 p-2.5" data-list>
          <article class="sg-card group cursor-grab rounded-xl border border-white/20 bg-white/15 p-3 backdrop-blur transition-colors hover:bg-white/25 active:cursor-grabbing" draggable="true" tabindex="0" data-id="SNIP-091">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="sg-mono rounded-md border border-white/30 bg-white/15 px-1.5 py-0.5 text-[10px] font-medium uppercase text-white backdrop-blur">P3</span>
              <span class="sg-mono text-[10px] text-white/55">SNIP-091</span>
            </div>
            <h4 class="font-sora text-[13.5px] font-semibold leading-snug text-white">Audit focus rings across sections</h4>
            <p class="mt-1 font-sora text-[12px] leading-relaxed text-white/70">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="sg-code">a11y</span>
                <span class="sg-code">audit</span>
              </div>
              <div class="sg-glow flex h-6 w-6 items-center justify-center rounded-full border border-white/30 bg-white/25 font-sora text-[10px] font-semibold text-white backdrop-blur">RM</div>
            </div>
          </article>
        </div>
        <button type="button" class="sg-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/25 bg-white/5 py-2 sg-mono text-[11px] text-white/75 backdrop-blur transition-colors hover:bg-white/15 hover:text-white focus:outline-none focus-visible:ring-2 focus-visible:ring-white/60">
          <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="sg-col w-[280px] shrink-0 rounded-xl border border-white/20 bg-white/10 backdrop-blur-md" aria-label="Done">
        <header class="flex items-center justify-between border-b border-white/15 px-3.5 py-2.5">
          <div class="flex items-center gap-2">
            <span class="sg-dot"></span>
            <h3 class="font-sora text-[13px] font-semibold text-white/70">Done</h3>
          </div>
          <span class="sg-count sg-mono rounded-full border border-white/20 bg-white/15 px-2 py-0.5 text-[11px] text-white backdrop-blur" data-count>2</span>
        </header>
        <div class="sg-list space-y-3 p-2.5" data-list>
          <article class="sg-card group cursor-grab rounded-xl border border-white/20 bg-white/15 p-3 backdrop-blur transition-colors hover:bg-white/25 active:cursor-grabbing" draggable="true" tabindex="0" data-id="SNIP-087">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="sg-mono rounded-md border border-white/30 bg-white/15 px-1.5 py-0.5 text-[10px] font-medium uppercase text-white backdrop-blur">P3</span>
              <span class="sg-mono text-[10px] text-white/55">SNIP-087</span>
            </div>
            <h4 class="font-sora text-[13.5px] font-semibold leading-snug text-white/70 line-through decoration-white/40">Set up CDN + fonts scaffold</h4>
            <p class="mt-1 font-sora text-[12px] leading-relaxed text-white/50">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="sg-code">infra</span>
              </div>
              <div class="sg-glow flex h-6 w-6 items-center justify-center rounded-full border border-white/30 bg-white/25 font-sora text-[10px] font-semibold text-white backdrop-blur">JL</div>
            </div>
          </article>

          <article class="sg-card group cursor-grab rounded-xl border border-white/20 bg-white/15 p-3 backdrop-blur transition-colors hover:bg-white/25 active:cursor-grabbing" draggable="true" tabindex="0" data-id="SNIP-074">
            <div class="mb-2 flex items-center justify-between gap-2">
              <span class="sg-mono rounded-md border border-white/30 bg-white/15 px-1.5 py-0.5 text-[10px] font-medium uppercase text-white backdrop-blur">P3</span>
              <span class="sg-mono text-[10px] text-white/55">SNIP-074</span>
            </div>
            <h4 class="font-sora text-[13.5px] font-semibold leading-snug text-white/70 line-through decoration-white/40">Write STYLE_TOKENS reference</h4>
            <p class="mt-1 font-sora text-[12px] leading-relaxed text-white/50">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="sg-code">docs</span>
              </div>
              <div class="sg-glow flex h-6 w-6 items-center justify-center rounded-full border border-white/30 bg-white/25 font-sora text-[10px] font-semibold text-white backdrop-blur">SK</div>
            </div>
          </article>
        </div>
        <button type="button" class="sg-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/25 bg-white/5 py-2 sg-mono text-[11px] text-white/75 backdrop-blur transition-colors hover:bg-white/15 hover:text-white focus:outline-none focus-visible:ring-2 focus-visible:ring-white/60">
          <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="sg"] .sg-mono { font-family: 'JetBrains Mono', ui-monospace, monospace; }
    [data-board="sg"] .font-sora { font-family: 'Sora', sans-serif; }
    [data-board="sg"] .sg-code { font-family: 'JetBrains Mono', monospace; font-size: 11px; background: rgba(255,255,255,0.18); padding: 1px 6px; border-radius: 5px; color: #fff; backdrop-filter: blur(4px); }
    [data-board="sg"] .sg-dot { display: inline-block; height: 6px; width: 6px; border-radius: 9999px; background: #6ee7ff; box-shadow: 0 0 8px #6ee7ff; }
    [data-board="sg"] .sg-glow { box-shadow: 0 0 0 1px rgba(255,255,255,0.08), 0 4px 20px -4px rgba(168,85,247,0.5); }
    [data-board="sg"] .sg-list { min-height: 48px; transition: background-color .12s ease; border-radius: 10px; }
    [data-board="sg"] .sg-list.sg-over { background-color: rgba(168,85,247,0.18); outline: 1px dashed rgba(255,255,255,0.55); outline-offset: -2px; }
    [data-board="sg"] .sg-card.sg-drag { opacity: .35; }
    [data-board="sg"] .sg-card:focus { outline: 2px solid rgba(255,255,255,0.6); outline-offset: 2px; }
    [data-board="sg"] .sg-placeholder { border: 1px dashed rgba(255,255,255,0.45); background: rgba(255,255,255,0.06); height: 82px; border-radius: 12px; }
    [data-board="sg"] .board-cols { scrollbar-width: thin; scrollbar-color: rgba(255,255,255,0.25) transparent; }
    [data-board="sg"] .board-cols::-webkit-scrollbar { height: 8px; }
    [data-board="sg"] .board-cols::-webkit-scrollbar-track { background: transparent; }
    [data-board="sg"] .board-cols::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.22); border-radius: 9999px; }
  </style>

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

      function updateCounts() {
        root.querySelectorAll('.sg-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 = 'sg-placeholder';
        return p;
      }

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

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

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

      cols.forEach(function (list) {
        list.addEventListener('dragover', function (e) {
          e.preventDefault();
          if (e.dataTransfer) e.dataTransfer.dropEffect = 'move';
          list.classList.add('sg-over');
          if (!dragged || !placeholder) return;
          var after = null;
          var cards = list.querySelectorAll('.sg-card:not(.sg-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('sg-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'];
      var grad = ['from-fuchsia-500 to-pink-500', 'from-indigo-500 to-violet-500', 'from-cyan-500 to-blue-500', 'from-emerald-500 to-teal-500'];
      root.querySelectorAll('.sg-add').forEach(function (btn) {
        btn.addEventListener('click', function () {
          var col = btn.closest('.sg-col');
          var list = col.querySelector('[data-list]');
          uid += 1;
          var id = 'SNIP-' + (200 + uid);
          var g = grad[uid % grad.length];
          var card = document.createElement('article');
          card.className = 'sg-card group cursor-grab rounded-xl border border-white/20 bg-white/15 p-3 backdrop-blur transition-colors hover:bg-white/25 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="sg-mono rounded-md border border-white/30 bg-gradient-to-r ' + g + ' px-1.5 py-0.5 text-[10px] font-medium uppercase text-white">P2</span>' +
            '<span class="sg-mono text-[10px] text-white/55">' + id + '</span>' +
            '</div>' +
            '<h4 class="font-sora text-[13.5px] font-semibold leading-snug text-white">New task — define the next step</h4>' +
            '<p class="mt-1 font-sora text-[12px] leading-relaxed text-white/70">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="sg-code">new</span></div>' +
            '<div class="sg-glow flex h-6 w-6 items-center justify-center rounded-full border border-white/30 bg-white/25 font-sora text-[10px] font-semibold text-white backdrop-blur">' + 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('.sg-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('.sg-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>