Signal radial telemetry

<!-- Original layout, SVG/CSS artwork and JavaScript © 2026 XXC Templates. MIT License.
Illustrative sample content and data; no real accounts, purchases or bookings. -->
<main>
  <header class="intro">
    <div>
      <div class="kicker">DATA STORIES / SAMPLE DATA</div>
      <h1>Signal radial telemetry</h1>
      <p>
        Four compact circular gauges with honest ranges and a simulated status update. A technical
        dashboard component with a readable text fallback.
      </p>
    </div>
    <span class="badge">INTERACTIVE SVG</span>
  </header>
  <section class="panel">
    <div id="gauges" class="gauges"></div>
    <div class="toolbar">
      <button id="change">Simulate next reading</button
      ><span class="badge">SIMULATION / NO LIVE CONNECTION</span>
    </div>
    <output id="status" class="status" aria-live="polite"></output>
    <details class="data-table">
      <summary>View data table</summary>
      <div class="table-scroll"><table id="data-table"></table></div>
    </details>
  </section>
  <footer>Illustrative data · no external services · keyboard-accessible controls</footer>
</main>

:root {
  --bg: #100c20;
  --panel: #1b1230;
  --text: #fbecff;
  --muted: #bb9ed3;
  --line: #4a285b;
  --accent: #ff70cc;
}
/* Original XXC Templates Studio collection. MIT; sample data only. */
* {
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}
html {
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}
body {
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h1,
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h3,
p {
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h1 {
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h2 {
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h3 {
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p {
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button,
input,
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button,
a,
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summary {
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button {
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a {
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input[type="range"] {
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.panel {
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@media (max-width: 520px) {
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@media (max-width: 520px) {
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(() => {
  "use strict";
  const $ = (s) => document.querySelector(s),
    $$ = (s) => [...document.querySelectorAll(s)],
    status = (t) => {
      const el = $("#status");
      if (el) el.textContent = t;
    },
    clamp = (n, a, b) => Math.max(a, Math.min(b, n));
  const reduced = matchMedia("(prefers-reduced-motion: reduce)").matches;
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    return el;
  }
  function table(headers, rows) {
    const t = $("#data-table");
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    const caption = document.createElement("caption");
    caption.textContent = "Illustrative sample data";
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  const colors = ["#82b6ff", "#72dbc2", "#c5a4ff", "#f7bf7c", "#fa92b8", "#acd884"];
  const names = ["CPU load", "Memory", "Storage", "Queue"],
    units = ["%", "%", "%", "%"];
  let step = 0;
  function draw() {
    const values = [
      34 + ((step * 7) % 40),
      62 + ((step * 3) % 20),
      48 + ((step * 2) % 30),
      18 + ((step * 11) % 55),
    ];
    $("#gauges").replaceChildren();
    names.forEach((name, i) => {
      const wrap = document.createElement("div");
      wrap.className = "gauge";
      const s = svg("svg", {
        viewBox: "0 0 150 150",
        role: "img",
        "aria-label": name + ": " + values[i] + " percent",
      });
      s.append(
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          cy: 75,
          r: 58,
          fill: "none",
          stroke: "var(--line)",
          "stroke-width": 9,
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      );
      s.append(
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          cy: 75,
          r: 58,
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          stroke: colors[i],
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          "stroke-linecap": "round",
          "stroke-dasharray": (values[i] / 100) * 364.425 + " 364.425",
          transform: "rotate(-90 75 75)",
        }),
      );
      s.append(
        svg(
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            y: 83,
            "text-anchor": "middle",
            fill: "var(--text)",
            "font-size": 28,
            "font-family": "monospace",
          },
          values[i] + "%",
        ),
      );
      const h = document.createElement("h2");
      h.textContent = name;
      const p = document.createElement("p");
      p.textContent = values[i] < 70 ? "NOMINAL" : "ELEVATED";
      wrap.append(s, h, p);
      $("#gauges").append(wrap);
    });
    table(
      ["Metric", "Percent"],
      names.map((n, i) => [n, values[i]]),
    );
  }
  $("#change").addEventListener("click", () => {
    step++;
    draw();
    status("Simulation reading " + step + " displayed.");
  });
  draw();
})();