redfrobro.github.io/index.html at master · redfrobro/redfrobro.github.io · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <title>Drake Equation Calculator</title>
  <meta name="description" content="Interactive Drake Equation calculator built with pure HTML, CSS, and JavaScript." />
  <style>
    :root {
      --bg: #0b1020;
      --card: rgba(20, 28, 56, 0.9);
      --text: #e6edf3;
      --muted: #c2cee0;
      --accent: #7cc4ff;
      --accent-2: #9effa1;
      --danger: #ff6b6b;
      --shadow: 0 10px 30px rgba(0,0,0,0.45);
      --radius: 14px;
    }

    * { box-sizing: border-box; }

    html, body {
      height: 100%;
      margin: 0;
      color: var(--text);
      font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
      background: var(--bg) fixed no-repeat center/cover url('images/BG1.jpg');
    }

    .backdrop {
      position: fixed;
      inset: 0;
      background: radial-gradient(1200px 800px at 70% -10%, rgba(124,196,255,0.20), transparent 60%),
                  radial-gradient(1000px 700px at -20% 120%, rgba(158,255,161,0.15), transparent 60%),
                  linear-gradient(180deg, rgba(7,10,20,0.78), rgba(7,10,20,0.78));
      pointer-events: none;
    }

    .wrap {
      min-height: 100%;
      display: grid;
      grid-template-rows: auto 1fr auto;
    }

    header {
      padding: 32px 16px 0;
      text-align: center;
    }

    header h1 {
      margin: 0 0 8px;
      font-weight: 800;
      letter-spacing: 0.3px;
      font-size: clamp(1.6rem, 3.5vw, 2.2rem);
    }

    header p {
      margin: 0 auto;
      max-width: 800px;
      color: var(--muted);
      font-size: 0.98rem;
      line-height: 1.4rem;
    }

    .container {
      padding: 24px 16px 48px;
      display: grid;
      place-items: center;
    }

    .card {
      width: min(980px, 96vw);
      background: var(--card);
      border: 1px solid rgba(255,255,255,0.14);
      box-shadow: var(--shadow);
      border-radius: var(--radius);
      overflow: hidden;
    }

    .grid {
      display: grid;
      grid-template-columns: repeat(12, 1fr);
      gap: 14px 16px;
      padding: 22px;
    }

    .row {
      grid-column: 1 / -1;
      display: contents; /* use children placement */
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    .field {
      grid-column: span 6;
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    @media (max-width: 720px) {
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      color: var(--muted);
      font-size: 0.86rem;
      line-height: 1.2rem;
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    .inputs {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-top: 10px;
    }

    input[type="number"] {
      flex: 0 0 160px;
      background: rgba(255,255,255,0.08);
      color: var(--text);
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      padding: 8px 10px;
      font-size: 1rem;
      outline: none;
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    input[type="range"] {
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    .equation {
      grid-column: 1 / -1;
      margin: 2px 0 2px;
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      overflow-x: auto;
      white-space: nowrap;
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    .result {
      grid-column: 1 / -1;
      display: grid;
      grid-template-columns: 1fr auto;
      align-items: center;
      gap: 16px;
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    .result .value {
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      font-weight: 800;
      letter-spacing: 0.3px;
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    .result .value small { color: var(--muted); font-weight: 600; }

    .actions {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
    }

    button {
      background: linear-gradient(180deg, rgba(124,196,255,0.45), rgba(124,196,255,0.25));
      border: 1px solid rgba(124,196,255,0.8);
      color: var(--text);
      padding: 10px 14px;
      border-radius: 10px;
      cursor: pointer;
      font-weight: 700;
    }
    button:hover { filter: brightness(1.06); }

    footer {
      text-align: center;
      color: var(--muted);
      padding: 12px 16px 28px;
      font-size: 0.9rem;
    }
    a { color: var(--accent-2); text-decoration: none; }
  </style>
</head>
<body>
  <div class="wrap">
    <header>
      <h1>Drake Equation Calculator</h1>
      <p>
        Estimate the number of active, technologically advanced civilizations in our galaxy using the Drake equation.
        Adjust the parameters below to see how your assumptions change the result.
      </p>
    </header>

    <main class="container">
      <section class="card" aria-labelledby="eq-title">
        <div class="grid">
          <div class="equation" id="eq-title" aria-live="polite">
            N = R* × (1 - f_bin) × f_p × f_hz × n_e × (1 - f_gc) × f_t × f_l × f_i × f_c × L
          </div>

          <div class="row">
            <div class="field">
              <label for="rstar"><span class="symbol">R*</span> Average star formation rate (per year)
                <input type="number" id="rstar" min="0" step="0.1" value="1.5" aria-describedby="hint-rstar" />
              </label>
              <p id="hint-rstar" class="hint">Average rate of star formation in the Milky Way.</p>
            </div>

            <div class="field">
              <label for="fbin"><span class="symbol">f_bin</span> Fraction of new stars that are binary
                <input type="number" id="fbin" min="0" max="1" step="0.01" value="0.55" aria-describedby="hint-fbin" />
              </label>
              <p id="hint-fbin" class="hint">Estimated fraction of newly formed stars that are binary (0–1). Higher values reduce N; the model uses (1 - f_bin) because close binaries can hinder stable, life-supporting planetary systems.</p>
            </div>

            <div class="field">
              <label for="fp"><span class="symbol">f_p</span> Fraction of stars with planets
                <input type="number" id="fp" min="0" max="1" step="0.01" value="0.9" aria-describedby="hint-fp" />
              </label>
              <p id="hint-fp" class="hint">Proportion of stars that have planetary systems (0–1).</p>
            </div>

            <div class="field">
              <label for="fhz"><span class="symbol">f_hz</span> Fraction in habitable zones
                <input type="number" id="fhz" min="0" max="1" step="0.01" value="0.25" aria-describedby="hint-fhz" />
              </label>
              <p id="hint-fhz" class="hint">Proportion of planets located within their star’s habitable zone (0–1).</p>
            </div>

            <div class="field">
              <label for="ne"><span class="symbol">n_e</span> Habitable planets per system
                <input type="number" id="ne" min="0" step="0.01" value="0.5" aria-describedby="hint-ne" />
              </label>
              <p id="hint-ne" class="hint">Average number of potentially habitable planets per stars habitable zone.</p>
            </div>

            <div class="field">
              <label for="fgc"><span class="symbol">f_gc</span> Fraction near galactic core
                <input type="number" id="fgc" min="0" max="1" step="0.01" value="0.2" aria-describedby="hint-fgc" />
              </label>
              <p id="hint-fgc" class="hint">Proportion of stellar systems close to the galactic core (0–1). Higher values reduce N; because proximity to the core is detrimental.</p>
            </div>

            <div class="field">
              <label for="ft"><span class="symbol">f_t</span> Fraction with plate tectonics
                <input type="number" id="ft" min="0" max="1" step="0.01" value="0.6" aria-describedby="hint-ft" />
              </label>
              <p id="hint-ft" class="hint">Proportion of habitable planets that have active plate tectonics (0–1).</p>
            </div>

            <div class="field">
              <label for="fl"><span class="symbol">f_l</span> Fraction where life appears
                <input type="number" id="fl" min="0" max="1" step="0.01" value="0.33" aria-describedby="hint-fl" />
              </label>
              <p id="hint-fl" class="hint">Proportion of habitable planets where life actually emerges (0–1).</p>
            </div>

            <div class="field">
              <label for="fi"><span class="symbol">f_i</span> Fraction with intelligent life
                <input type="number" id="fi" min="0" max="1" step="0.001" value="0.05" aria-describedby="hint-fi" />
              </label>
              <p id="hint-fi" class="hint">Proportion of life-bearing planets that develop intelligent life (0–1).</p>
            </div>

            <div class="field">
              <label for="fc"><span class="symbol">f_c</span> Fraction that communicate
                <input type="number" id="fc" min="0" max="1" step="0.01" value="0.1" aria-describedby="hint-fc" />
              </label>
              <p id="hint-fc" class="hint">Proportion that develop detectable communications (0–1).</p>
            </div>

            <div class="field" style="grid-column: span 12;">
              <label for="L"><span class="symbol">L</span> Communicating lifetime (years)
                <input type="number" id="L" min="0" step="1" value="10000" aria-describedby="hint-L" />
              </label>
              <p id="hint-L" class="hint">Average length of time civilizations release detectable signals.</p>
            </div>
          </div>
        </div>

        <div class="result">
          <div class="value" id="resultValue" aria-live="polite">
            N ≈ 0
          </div>
          <div class="actions">
            <button id="resetBtn" type="button" title="Reset to defaults">Reset</button>
            <button id="copyBtn" type="button" title="Copy current values as a shareable link">Copy Link</button>
          </div>
        </div>
      </section>
    </main>

    <footer>
      Built with pure HTML, CSS, and JavaScript. Background image courtesy of the repository.
    </footer>
  </div>

  <script>
    (function() {
      const $ = (id) => document.getElementById(id);
      const fields = ['rstar','fbin','fp','fhz','ne','fgc','ft','fl','fi','fc','L'];

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        const fbin_effect = 1 - parseVal('fbin');
        const fp = parseVal('fp');
        const fhz = parseVal('fhz');
        const ne = parseVal('ne');
        const fgc_effect = 1 - parseVal('fgc');
        const ft = parseVal('ft');
        const fl = parseVal('fl');
        const fi = parseVal('fi');
        const fc = parseVal('fc');
        const L = parseVal('L');
        const N = rstar * fbin_effect * fp * fhz * ne * fgc_effect * ft * fl * fi * fc * L;
        const res = document.getElementById('resultValue');
        res.innerHTML = `N ≈ ${fmtNumber(N)} <small>civilizations</small>`;
        updateEquationText();
      }

      function setDefaults() {
        $('rstar').value = 1.5;
        $('fbin').value = 0.55;
        $('fp').value = 0.9;
        $('ne').value = 0.2;
        $('fl').value = 0.5;
        $('fi').value = 0.05;
        $('fc').value = 0.3;
        $('ft').value = 0.6;
        $('fhz').value = 0.25;
        $('fgc').value = 0.2;
        $('L').value = 10000;
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          alert('Copy failed. You can manually copy the URL from the address bar.');
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</body>
</html>