<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      background: transparent;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      user-select: none;
    }

    .container {
      width: 100%;
      max-width: 580px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 12px;
    }

    .scale-container {
      width: 100%;
      padding: 0 4px;
    }

    .visual-bar-track {
      position: relative;
      height: 10px;
      background: #f1f5f9;
      border-radius: 5px;
      border: 1px solid #e2e8f0;
    }

    .visual-bar-fill {
      height: 100%;
      width: 50%;
      background: linear-gradient(90deg, #64748b, #d97706, #0284c7, #7c3aed, #16a34a);
      border-radius: 4px;
      transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .needle {
      position: absolute;
      top: -5px;
      left: 50%;
      width: 20px;
      height: 20px;
      background: #ffffff;
      border: 3px solid #1e2945;
      border-radius: 50%;
      transform: translateX(-50%);
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.18);
      transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      z-index: 2;
    }

    .grid-container {
      width: 100%;
      display: grid;
      grid-template-columns: 60px repeat(5, 1fr);
      gap: 6px;
    }

    .row-label {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      padding-right: 6px;
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: #64748b;
    }

    .badge-cell {
      display: flex;
      justify-content: center;
      align-items: stretch;
      cursor: pointer;
    }

    .badge {
      width: 100%;
      padding: 6px 2px;
      border-radius: 6px;
      font-size: 11px;
      font-weight: 700;
      text-align: center;
      display: flex;
      align-items: center;
      justify-content: center;
      line-height: 1.15;
      border: 1px solid transparent;
      transition: box-shadow 0.2s ease, border-color 0.2s ease, opacity 0.2s ease;
      cursor: pointer;
    }

    /* High-contrast qualitative scale badges */
    .badge-0 {
      background: #f1f5f9;
      color: #334155;
      border-color: #cbd5e1;
    }
    .badge-1 {
      background: #fef3c7;
      color: #92400e;
      border-color: #fde68a;
    }
    .badge-2 {
      background: #e0f2fe;
      color: #0369a1;
      border-color: #bae6fd;
    }
    .badge-3 {
      background: #ede9fe;
      color: #6d28d9;
      border-color: #ddd6fe;
    }
    .badge-4 {
      background: #dcfce7;
      color: #15803d;
      border-color: #bbf7d0;
    }

    .badge-selected {
      box-shadow: 0 0 0 2px #1e2945;
      border-color: #1e2945;
    }

    .cell {
      background: #f8fafc;
      border: 1px solid #e6e6e6;
      border-radius: 6px;
      padding: 7px 2px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 13px;
      font-weight: 600;
      color: #1e2945;
      cursor: pointer;
      transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .col-selected {
      background: #ffffff !important;
      border-color: #1e2945 !important;
      box-shadow: inset 0 0 0 1.5px #1e2945;
      font-weight: 700;
    }

    .summary-display {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
      gap: 8px;
      font-size: 14px;
      font-weight: 700;
      color: #1e2945;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 8px 14px;
      width: 100%;
      max-width: 480px;
    }

    .eq-pill {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      padding: 2px 8px;
      border-radius: 4px;
      color: #1e2945;
    }

    .summary-badge {
      padding: 3px 8px;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 700;
      border: 1px solid transparent;
    }

    @media (max-width: 440px) {
      .grid-container {
        gap: 3px;
        grid-template-columns: 46px repeat(5, 1fr);
      }
      .row-label {
        font-size: 9px;
        padding-right: 2px;
      }
      .badge {
        font-size: 9.5px;
        padding: 4px 1px;
        min-height: 32px;
      }
      .cell {
        font-size: 11.5px;
        padding: 6px 1px;
      }
      .summary-display {
        font-size: 12px;
        padding: 6px 8px;
        gap: 5px;
      }
      .summary-badge {
        font-size: 11px;
        padding: 2px 6px;
      }
    }
  </style>
</head>
<body>

  <div class="container">
    <div class="scale-container">
      <div class="visual-bar-track">
        <div class="visual-bar-fill" id="barFill"></div>
        <div class="needle" id="needle"></div>
      </div>
    </div>

    <div class="grid-container" id="grid">
      
      <div class="row-label">Scale</div>
      <div class="badge-cell" onclick="selectCol(0)"><div class="badge badge-0" id="badge-0">Impossible</div></div>
      <div class="badge-cell" onclick="selectCol(1)"><div class="badge badge-1" id="badge-1">Unlikely</div></div>
      <div class="badge-cell" onclick="selectCol(2)"><div class="badge badge-2" id="badge-2">Equally Likely</div></div>
      <div class="badge-cell" onclick="selectCol(3)"><div class="badge badge-3" id="badge-3">Likely</div></div>
      <div class="badge-cell" onclick="selectCol(4)"><div class="badge badge-4" id="badge-4">Certain</div></div>

      
      <div class="row-label">Fraction</div>
      <div class="cell" id="frac-0" onclick="selectCol(0)">0</div>
      <div class="cell" id="frac-1" onclick="selectCol(1)">1/4</div>
      <div class="cell" id="frac-2" onclick="selectCol(2)">1/2</div>
      <div class="cell" id="frac-3" onclick="selectCol(3)">3/4</div>
      <div class="cell" id="frac-4" onclick="selectCol(4)">1/1</div>

      
      <div class="row-label">Decimal</div>
      <div class="cell" id="dec-0" onclick="selectCol(0)">0.0</div>
      <div class="cell" id="dec-1" onclick="selectCol(1)">0.25</div>
      <div class="cell" id="dec-2" onclick="selectCol(2)">0.5</div>
      <div class="cell" id="dec-3" onclick="selectCol(3)">0.75</div>
      <div class="cell" id="dec-4" onclick="selectCol(4)">1.0</div>

      
      <div class="row-label">Percent</div>
      <div class="cell" id="pct-0" onclick="selectCol(0)">0%</div>
      <div class="cell" id="pct-1" onclick="selectCol(1)">25%</div>
      <div class="cell" id="pct-2" onclick="selectCol(2)">50%</div>
      <div class="cell" id="pct-3" onclick="selectCol(3)">75%</div>
      <div class="cell" id="pct-4" onclick="selectCol(4)">100%</div>
    </div>

    <div class="summary-display" id="summary">
      <span class="summary-badge badge-2" id="sumBadge">Equally Likely</span>
      <span>:</span>
      <span class="eq-pill" id="sumFrac">1/2</span>
      <span>=</span>
      <span class="eq-pill" id="sumDec">0.5</span>
      <span>=</span>
      <span class="eq-pill" id="sumPct">50%</span>
    </div>
  </div>

  <script>
    const data = [
      { pctValue: 0, frac: '0', dec: '0.0', pct: '0%', word: 'Impossible', badgeClass: 'badge-0' },
      { pctValue: 25, frac: '1/4', dec: '0.25', pct: '25%', word: 'Unlikely', badgeClass: 'badge-1' },
      { pctValue: 50, frac: '1/2', dec: '0.5', pct: '50%', word: 'Equally Likely', badgeClass: 'badge-2' },
      { pctValue: 75, frac: '3/4', dec: '0.75', pct: '75%', word: 'Likely', badgeClass: 'badge-3' },
      { pctValue: 100, frac: '1/1', dec: '1.0', pct: '100%', word: 'Certain', badgeClass: 'badge-4' }
    ];

    function selectCol(index) {
      const d = data[index];

      // Update bar and needle
      document.getElementById('barFill').style.width = d.pctValue + '%';
      document.getElementById('needle').style.left = d.pctValue + '%';

      // Update grid selection highlights
      for (let i = 0; i < 5; i++) {
        const isSel = (i === index);
        document.getElementById('badge-' + i).classList.toggle('badge-selected', isSel);
        document.getElementById('frac-' + i).classList.toggle('col-selected', isSel);
        document.getElementById('dec-' + i).classList.toggle('col-selected', isSel);
        document.getElementById('pct-' + i).classList.toggle('col-selected', isSel);
      }

      // Update summary text and badge class
      const sumBadge = document.getElementById('sumBadge');
      sumBadge.textContent = d.word;
      sumBadge.className = 'summary-badge ' + d.badgeClass;
      document.getElementById('sumFrac').textContent = d.frac;
      document.getElementById('sumDec').textContent = d.dec;
      document.getElementById('sumPct').textContent = d.pct;
    }

    // Initialize state
    selectCol(2);
  </script>
</body>
</html>

Understanding the Probability Scale from 0 to 1 and Percentages

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
      user-select: none;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #ffffff;
      color: #0f172a;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 14px;
      height: 100%;
      min-height: 380px;
    }

    .top-row {
      display: flex;
      gap: 12px;
      align-items: center;
      justify-content: space-between;
      flex: 1;
      max-height: 210px;
    }

    /* Jar Container */
    .jar-section {
      flex: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-width: 130px;
    }

    .jar {
      width: 110px;
      height: 125px;
      background: linear-gradient(135deg, rgba(241, 245, 249, 0.6) 0%, rgba(203, 213, 225, 0.3) 100%);
      border: 3px solid #94a3b8;
      border-top: 5px solid #64748b;
      border-radius: 12px 12px 28px 28px;
      position: relative;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      padding: 24px 10px 10px 10px;
      place-items: center;
      box-shadow: inset 0 2px 6px rgba(255, 255, 255, 0.8), 0 4px 12px rgba(15, 23, 42, 0.06);
      transition: border-color 0.25s ease;
    }

    .jar-neck {
      position: absolute;
      top: -9px;
      width: 60px;
      height: 7px;
      border: 3px solid #64748b;
      border-bottom: none;
      border-radius: 6px 6px 0 0;
      background: #e2e8f0;
    }

    /* 3D Marbles */
    .marble {
      width: 34px;
      height: 34px;
      border-radius: 50%;
      cursor: pointer;
      transition: filter 0.25s ease, opacity 0.25s ease, box-shadow 0.25s ease;
    }

    .marble-yellow {
      background: radial-gradient(circle at 35% 35%, #fffbeb 0%, #facc15 35%, #d97706 85%, #92400e 100%);
      box-shadow: 0 3px 6px rgba(180, 83, 9, 0.35), inset -2px -2px 4px rgba(0, 0, 0, 0.2);
    }

    .marble-blue {
      background: radial-gradient(circle at 35% 35%, #eff6ff 0%, #3b82f6 40%, #1d4ed8 85%, #172554 100%);
      box-shadow: 0 3px 6px rgba(29, 78, 216, 0.35), inset -2px -2px 4px rgba(0, 0, 0, 0.25);
    }

    .jar-label {
      margin-top: 6px;
      font-size: 13px;
      font-weight: 700;
      color: #475569;
      letter-spacing: 0.2px;
    }

    /* Calculation Cards */
    .cards-section {
      flex: 1.4;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .calc-card {
      background: #f8fafc;
      border: 2px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 14px;
      cursor: pointer;
      transition: border-color 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease, background-color 0.2s ease;
      display: flex;
      flex-direction: column;
      gap: 4px;
    }

    .calc-card-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .tag {
      font-size: 11px;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 0.6px;
      padding: 2px 8px;
      border-radius: 20px;
    }

    .tag-yellow {
      background: #fef08a;
      color: #854d0e;
    }

    .tag-blue {
      background: #dbeafe;
      color: #1e40af;
    }

    .card-formula {
      font-size: 15px;
      font-weight: 700;
      color: #0f172a;
      font-feature-settings: "tnum";
    }

    /* Card Themes & Active States */
    .calc-card.yellow-card {
      border-color: #fde047;
      background: #fffefb;
    }
    .calc-card.blue-card {
      border-color: #93c5fd;
      background: #fbfdff;
    }

    .calc-card.active-yellow {
      border-color: #d97706;
      box-shadow: 0 0 0 2px #fde047, 0 4px 10px rgba(217, 119, 6, 0.15);
      background: #fefce8;
    }
    .calc-card.active-blue {
      border-color: #2563eb;
      box-shadow: 0 0 0 2px #bfdbfe, 0 4px 10px rgba(37, 99, 235, 0.15);
      background: #eff6ff;
    }

    /* Bottom Scale Row */
    .scale-section {
      margin-top: 14px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 14px;
      padding: 18px 14px 12px 14px;
      position: relative;
    }

    .pin-container {
      position: relative;
      height: 38px;
      margin-bottom: 4px;
    }

    .pin {
      position: absolute;
      transform: translateX(-50%);
      display: flex;
      flex-direction: column;
      align-items: center;
      cursor: pointer;
      transition: filter 0.2s ease, opacity 0.2s ease;
    }

    .pin-yellow { left: 25%; }
    .pin-blue { left: 75%; }

    .pin-bubble {
      font-size: 12px;
      font-weight: 800;
      padding: 2px 7px;
      border-radius: 6px;
      white-space: nowrap;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    }

    .pin-yellow .pin-bubble {
      background: #f59e0b;
      color: #ffffff;
    }

    .pin-blue .pin-bubble {
      background: #2563eb;
      color: #ffffff;
    }

    .pin-arrow {
      width: 0;
      height: 0;
      border-left: 5px solid transparent;
      border-right: 5px solid transparent;
    }

    .pin-yellow .pin-arrow {
      border-top: 6px solid #f59e0b;
    }

    .pin-blue .pin-arrow {
      border-top: 6px solid #2563eb;
    }

    /* Track & Bar */
    .scale-bar-wrap {
      position: relative;
      height: 14px;
      background: #e2e8f0;
      border-radius: 7px;
      overflow: visible;
    }

    .scale-bar-fill {
      position: absolute;
      inset: 0;
      border-radius: 7px;
      background: linear-gradient(90deg, #94a3b8 0%, #f59e0b 25%, #64748b 50%, #2563eb 75%, #059669 100%);
      opacity: 0.9;
    }

    .scale-ticks {
      position: relative;
      display: flex;
      justify-content: space-between;
      top: -14px;
      height: 14px;
      pointer-events: none;
    }

    .tick {
      width: 2px;
      height: 14px;
      background: rgba(255, 255, 255, 0.85);
    }

    /* Scale Labels */
    .scale-labels {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      text-align: center;
      margin-top: 10px;
      gap: 2px;
    }

    .benchmark {
      display: flex;
      flex-direction: column;
      align-items: center;
      transition: opacity 0.2s ease;
    }

    .bm-name {
      font-size: 11px;
      font-weight: 700;
      color: #475569;
      line-height: 1.2;
    }

    .bm-val {
      font-size: 10px;
      font-weight: 600;
      color: #94a3b8;
      margin-top: 2px;
    }

    /* Dimmed States during focus */
    .focus-yellow .dim-on-yellow,
    .focus-blue .dim-on-blue {
      opacity: 0.35;
      filter: grayscale(0.5);
    }

    .focus-yellow .highlight-yellow,
    .focus-blue .highlight-blue {
      filter: brightness(1.08);
    }
  </style>
</head>
<body>

  
  <div class="top-row" id="mainContainer">
    <div class="jar-section">
      <div class="jar">
        <div class="jar-neck"></div>
        <div class="marble marble-blue dim-on-yellow highlight-blue" data-target="blue"></div>
        <div class="marble marble-yellow dim-on-blue highlight-yellow" data-target="yellow"></div>
        <div class="marble marble-blue dim-on-yellow highlight-blue" data-target="blue"></div>
        <div class="marble marble-blue dim-on-yellow highlight-blue" data-target="blue"></div>
      </div>
      <div class="jar-label">Total = 4 Marbles</div>
    </div>

    <div class="cards-section">
      
      <div class="calc-card yellow-card highlight-yellow dim-on-blue" data-target="yellow" id="cardYellow">
        <div class="calc-card-header">
          <span style="font-size:13px; font-weight:800; color:#b45309;">1 Yellow</span>
          <span class="tag tag-yellow">Unlikely</span>
        </div>
        <div class="card-formula">P(Yellow) = 1/4 = 0.25 = 25%</div>
      </div>

      
      <div class="calc-card blue-card highlight-blue dim-on-yellow" data-target="blue" id="cardBlue">
        <div class="calc-card-header">
          <span style="font-size:13px; font-weight:800; color:#1d4ed8;">3 Blue</span>
          <span class="tag tag-blue">Likely</span>
        </div>
        <div class="card-formula">P(Blue) = 3/4 = 0.75 = 75%</div>
      </div>
    </div>
  </div>

  
  <div class="scale-section">
    <div class="pin-container">
      <div class="pin pin-yellow highlight-yellow dim-on-blue" data-target="yellow" id="pinYellow">
        <div class="pin-bubble">0.25 (25%)</div>
        <div class="pin-arrow"></div>
      </div>
      <div class="pin pin-blue highlight-blue dim-on-yellow" data-target="blue" id="pinBlue">
        <div class="pin-bubble">0.75 (75%)</div>
        <div class="pin-arrow"></div>
      </div>
    </div>

    <div class="scale-bar-wrap">
      <div class="scale-bar-fill"></div>
      <div class="scale-ticks">
        <div class="tick" style="margin-left:1px;"></div>
        <div class="tick"></div>
        <div class="tick"></div>
        <div class="tick"></div>
        <div class="tick" style="margin-right:1px;"></div>
      </div>
    </div>

    <div class="scale-labels">
      <div class="benchmark dim-on-yellow dim-on-blue">
        <span class="bm-name">Impossible</span>
        <span class="bm-val">0 (0%)</span>
      </div>
      <div class="benchmark highlight-yellow dim-on-blue">
        <span class="bm-name" style="color:#b45309;">Unlikely</span>
        <span class="bm-val">0.25</span>
      </div>
      <div class="benchmark dim-on-yellow dim-on-blue">
        <span class="bm-name">Even</span>
        <span class="bm-val">0.5 (50%)</span>
      </div>
      <div class="benchmark highlight-blue dim-on-yellow">
        <span class="bm-name" style="color:#1d4ed8;">Likely</span>
        <span class="bm-val">0.75</span>
      </div>
      <div class="benchmark dim-on-yellow dim-on-blue">
        <span class="bm-name">Certain</span>
        <span class="bm-val">1.0 (100%)</span>
      </div>
    </div>
  </div>

  <script>
    let activeState = null;
    const body = document.body;
    const cardYellow = document.getElementById('cardYellow');
    const cardBlue = document.getElementById('cardBlue');

    function setState(type) {
      if (activeState === type) {
        // Reset to all neutral
        activeState = null;
        body.classList.remove('focus-yellow', 'focus-blue');
        cardYellow.classList.remove('active-yellow');
        cardBlue.classList.remove('active-blue');
      } else {
        activeState = type;
        body.classList.remove('focus-yellow', 'focus-blue');
        cardYellow.classList.remove('active-yellow');
        cardBlue.classList.remove('active-blue');

        if (type === 'yellow') {
          body.classList.add('focus-yellow');
          cardYellow.classList.add('active-yellow');
        } else if (type === 'blue') {
          body.classList.add('focus-blue');
          cardBlue.classList.add('active-blue');
        }
      }
    }

    document.querySelectorAll('[data-target]').forEach(el => {
      el.addEventListener('click', (e) => {
        e.stopPropagation();
        setState(el.getAttribute('data-target'));
      });
    });

    document.body.addEventListener('click', () => {
      if (activeState) setState(activeState);
    });
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      user-select: none;
      -webkit-user-select: none;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #ffffff;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      padding: 16px;
    }

    .scale-wrap {
      width: 100%;
      max-width: 620px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 16px;
    }

    /* Live readout badge */
    .readout-card {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      background: #f8fafc;
      border: 1.5px solid #e2e8f0;
      border-radius: 999px;
      padding: 6px 18px;
      font-size: 15px;
      font-weight: 600;
      min-height: 42px;
      box-shadow: 0 2px 6px rgba(0,0,0,0.04);
      transition: border-color 0.25s, background 0.25s;
    }

    .readout-tag {
      padding: 2px 10px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    /* Icons row */
    .icons-row {
      width: 100%;
      display: flex;
      justify-content: space-between;
      position: relative;
      padding: 0 4px;
    }

    .icon-box {
      display: flex;
      flex-direction: column;
      align-items: center;
      cursor: pointer;
      transition: transform 0.2s ease;
    }

    .icon-circle {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      background: #ffffff;
      border: 2px solid #e2e8f0;
      box-shadow: 0 2px 5px rgba(0,0,0,0.06);
    }

    .icon-box.active .icon-circle {
      border-color: #1e2945;
      box-shadow: 0 0 0 3px rgba(34, 183, 255, 0.35);
    }

    /* Main Bar Track */
    .bar-container {
      width: 100%;
      position: relative;
      padding: 12px 0 28px 0;
      cursor: pointer;
      touch-action: none;
    }

    .bar-track {
      width: 100%;
      height: 22px;
      border-radius: 11px;
      display: flex;
      overflow: hidden;
      box-shadow: inset 0 2px 4px rgba(0,0,0,0.12);
      border: 1px solid rgba(0,0,0,0.06);
    }

    .seg-red {
      width: 25%;
      background: #ef4444;
    }

    .seg-orange {
      width: 24%;
      background: #f97316;
    }

    .seg-yellow {
      width: 2%;
      background: #eab308;
    }

    .seg-lightgreen {
      width: 24%;
      background: #84cc16;
    }

    .seg-deepgreen {
      width: 25%;
      background: #10b981;
    }

    /* Slider / Marker Thumb */
    .slider-thumb {
      position: absolute;
      top: 3px;
      left: 50%;
      transform: translateX(-50%);
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #ffffff;
      border: 3px solid #1e2945;
      box-shadow: 0 3px 8px rgba(0,0,0,0.25);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: grab;
      z-index: 10;
      transition: left 0.15s ease-out;
      pointer-events: none;
    }

    .slider-thumb-inner {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #22b7ff;
    }

    /* Scale Ticks */
    .ticks-container {
      width: 100%;
      display: flex;
      justify-content: space-between;
      position: relative;
      margin-top: 4px;
    }

    .tick {
      display: flex;
      flex-direction: column;
      align-items: center;
      width: 20%;
      text-align: center;
      cursor: pointer;
    }

    .tick-line {
      width: 2px;
      height: 8px;
      background: #94a3b8;
      margin-bottom: 6px;
    }

    .tick-val {
      font-size: 14px;
      font-weight: 700;
      color: #0f172a;
      line-height: 1.2;
    }

    .tick-sub {
      font-size: 11px;
      font-weight: 600;
      color: #64748b;
      margin-top: 1px;
    }

    .tick-name {
      font-size: 12px;
      font-weight: 700;
      margin-top: 4px;
      line-height: 1.1;
    }

    .c-red { color: #dc2626; }
    .c-orange { color: #ea580c; }
    .c-yellow { color: #ca8a04; }
    .c-lightgreen { color: #65a30d; }
    .c-deepgreen { color: #059669; }

    /* Quick Preset Buttons */
    .presets-row {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 6px;
      width: 100%;
    }

    .preset-btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      padding: 6px 10px;
      font-size: 12px;
      font-weight: 600;
      color: #334155;
      cursor: pointer;
      transition: background 0.15s, border-color 0.15s, color 0.15s;
    }

    .preset-btn:active, .preset-btn.active {
      background: #1e2945;
      border-color: #1e2945;
      color: #ffffff;
    }

    @media (max-width: 480px) {
      .icon-circle {
        width: 36px;
        height: 36px;
        font-size: 17px;
      }
      .tick-val {
        font-size: 12px;
      }
      .tick-sub {
        font-size: 10px;
      }
      .tick-name {
        font-size: 10px;
      }
      .readout-card {
        font-size: 13px;
        padding: 4px 12px;
      }
    }
  </style>
</head>
<body>

  <div class="scale-wrap">
    
    <div class="readout-card" id="readoutCard">
      <span id="readoutVal">0.5 = 50%</span>
      <span class="readout-tag" id="readoutTag" style="background:#fef08a; color:#854d0e;">Even Chance</span>
    </div>

    
    <div class="icons-row">
      <div class="icon-box" id="icon0" onclick="setValue(0)">
        <div class="icon-circle" title="Impossible">⊘</div>
      </div>
      <div class="icon-box" id="icon25" onclick="setValue(0.25)">
        <div class="icon-circle" style="font-size:16px;">☂️</div>
      </div>
      <div class="icon-box active" id="icon50" onclick="setValue(0.5)">
        <div class="icon-circle">🪙</div>
      </div>
      <div class="icon-box" id="icon75" onclick="setValue(0.75)">
        <div class="icon-circle" style="font-size:16px;">☀️</div>
      </div>
      <div class="icon-box" id="icon100" onclick="setValue(1.0)">
        <div class="icon-circle" style="color:#059669; font-weight:bold;">✓</div>
      </div>
    </div>

    
    <div class="bar-container" id="barContainer">
      <div class="bar-track">
        <div class="seg-red" title="0 to 0.25"></div>
        <div class="seg-orange" title="0.25 to 0.49"></div>
        <div class="seg-yellow" title="0.5"></div>
        <div class="seg-lightgreen" title="0.51 to 0.75"></div>
        <div class="seg-deepgreen" title="0.75 to 1.0"></div>
      </div>
      <div class="slider-thumb" id="thumb">
        <div class="slider-thumb-inner" id="thumbDot"></div>
      </div>
    </div>

    
    <div class="ticks-container">
      <div class="tick" onclick="setValue(0)">
        <div class="tick-line"></div>
        <div class="tick-val">0</div>
        <div class="tick-sub">0%</div>
        <div class="tick-name c-red">Impossible</div>
      </div>
      <div class="tick" onclick="setValue(0.25)">
        <div class="tick-line"></div>
        <div class="tick-val">0.25</div>
        <div class="tick-sub">25% (¼)</div>
        <div class="tick-name c-orange">Unlikely</div>
      </div>
      <div class="tick" onclick="setValue(0.5)">
        <div class="tick-line" style="height:12px; background:#1e2945; width:2px;"></div>
        <div class="tick-val">0.5</div>
        <div class="tick-sub">50% (½)</div>
        <div class="tick-name c-yellow">Even Chance</div>
      </div>
      <div class="tick" onclick="setValue(0.75)">
        <div class="tick-line"></div>
        <div class="tick-val">0.75</div>
        <div class="tick-sub">75% (¾)</div>
        <div class="tick-name c-lightgreen">Likely</div>
      </div>
      <div class="tick" onclick="setValue(1)">
        <div class="tick-line"></div>
        <div class="tick-val">1</div>
        <div class="tick-sub">100%</div>
        <div class="tick-name c-deepgreen">Certain</div>
      </div>
    </div>

    
    <div class="presets-row">
      <button class="preset-btn" onclick="setValue(0)">0 (Impossible)</button>
      <button class="preset-btn" onclick="setValue(0.25)">0.25 (Unlikely)</button>
      <button class="preset-btn active" onclick="setValue(0.5)">0.5 (Even)</button>
      <button class="preset-btn" onclick="setValue(0.75)">0.75 (Likely)</button>
      <button class="preset-btn" onclick="setValue(1.0)">1.0 (Certain)</button>
    </div>
  </div>

  <script>
    let currentVal = 0.5;
    const bar = document.getElementById('barContainer');
    const thumb = document.getElementById('thumb');
    const thumbDot = document.getElementById('thumbDot');
    const readoutVal = document.getElementById('readoutVal');
    const readoutTag = document.getElementById('readoutTag');

    const presets = [0, 0.25, 0.5, 0.75, 1.0];
    const buttons = document.querySelectorAll('.preset-btn');
    const icons = {
      '0': document.getElementById('icon0'),
      '0.25': document.getElementById('icon25'),
      '0.5': document.getElementById('icon50'),
      '0.75': document.getElementById('icon75'),
      '1': document.getElementById('icon100')
    };

    function updateUI(v) {
      currentVal = Math.max(0, Math.min(1, v));
      const pct = (currentVal * 100).toFixed(0);
      const dec = currentVal.toFixed(2).replace(/\.00$/, '').replace(/(\.\d)0$/, '$1');
      
      thumb.style.left = `${currentVal * 100}%`;

      let descriptor = '';
      let tagBg = '#f1f5f9';
      let tagColor = '#334155';
      let dotColor = '#22b7ff';

      if (currentVal === 0) {
        descriptor = 'Impossible';
        tagBg = '#fee2e2'; tagColor = '#991b1b'; dotColor = '#ef4444';
      } else if (currentVal < 0.5) {
        descriptor = 'Unlikely';
        tagBg = '#ffedd5'; tagColor = '#9a3412'; dotColor = '#f97316';
      } else if (currentVal === 0.5) {
        descriptor = 'Even Chance';
        tagBg = '#fef08a'; tagColor = '#854d0e'; dotColor = '#eab308';
      } else if (currentVal < 1.0) {
        descriptor = 'Likely';
        tagBg = '#ecfccb'; tagColor = '#3f6212'; dotColor = '#84cc16';
      } else {
        descriptor = 'Certain';
        tagBg = '#d1fae5'; tagColor = '#065f46'; dotColor = '#10b981';
      }

      thumbDot.style.background = dotColor;
      readoutVal.textContent = `${dec} = ${pct}%`;
      readoutTag.textContent = descriptor;
      readoutTag.style.background = tagBg;
      readoutTag.style.color = tagColor;

      // Update preset buttons
      buttons.forEach(btn => {
        const valAttr = parseFloat(btn.getAttribute('onclick').match(/[\d.]+/)[0]);
        if (Math.abs(valAttr - currentVal) < 0.01) {
          btn.classList.add('active');
        } else {
          btn.classList.remove('active');
        }
      });

      // Update active icon highlight
      Object.keys(icons).forEach(k => {
        if (Math.abs(parseFloat(k) - currentVal) < 0.01) {
          icons[k].classList.add('active');
        } else {
          icons[k].classList.remove('active');
        }
      });
    }

    function setValue(val) {
      updateUI(val);
    }

    let isDragging = false;

    function handlePointer(e) {
      const rect = bar.getBoundingClientRect();
      const clientX = e.touches ? e.touches[0].clientX : e.clientX;
      const rawFrac = (clientX - rect.left) / rect.width;
      let frac = Math.max(0, Math.min(1, rawFrac));
      
      // Snap to nearest milestone if very close (< 0.04)
      for (const snap of presets) {
        if (Math.abs(frac - snap) < 0.04) {
          frac = snap;
          break;
        }
      }
      updateUI(frac);
    }

    bar.addEventListener('mousedown', (e) => {
      isDragging = true;
      handlePointer(e);
    });

    window.addEventListener('mousemove', (e) => {
      if (isDragging) handlePointer(e);
    });

    window.addEventListener('mouseup', () => {
      isDragging = false;
    });

    bar.addEventListener('touchstart', (e) => {
      isDragging = true;
      handlePointer(e);
    }, { passive: true });

    window.addEventListener('touchmove', (e) => {
      if (isDragging) handlePointer(e);
    }, { passive: true });

    window.addEventListener('touchend', () => {
      isDragging = false;
    });

    updateUI(0.5);
  </script>
</body>
</html>

Classifying Whole Numbers, Integers, and Rational Numbers

Using Venn Diagrams to Show Number Set Relationships

Describing Relationships Between Number Sets

Identifying a Number and Its Opposite

Understanding Absolute Value on a Number Line

Opposites and Absolute Value in Real-World Contexts

Locating Integers on a Number Line

Locating Rational Numbers on a Number Line

math

Classifying and Locating Numbers on Number Lines

Comparing Integers Using Number Lines

Comparing Rational Numbers Using Number Lines

Ordering Integers and Rational Numbers from Least to Greatest

Ordering Rational Numbers from Mathematical Contexts

Ordering Rational Numbers from Real-World Contexts

Understanding Fraction Notation as Division

Converting Between Division Expressions and Fraction Notation

Distance Between Two Rational Numbers on a Number Line

Comparing, Ordering, and Working with Rational Numbers

Modeling Integer Addition with Number Lines

Modeling Integer Addition with Two-Color Counters

Connecting Integer Addition Models to Standard Algorithms

Adding Integers with the Same Sign

Adding Integers with Different Signs

Adding Multiple Integers Fluently

Integer Addition Word Problems

Integer Addition

Modeling Integer Subtraction with Number Lines

Modeling Integer Subtraction with Two-Color Counters

Connecting Subtraction to Adding the Opposite

Subtracting Integers Fluently

Integer Subtraction Word Problems

Integer Subtraction

Modeling Integer Multiplication with Number Lines

Connecting Integer Multiplication Models to Algorithms

Multiplying Integers with the Same Sign

Multiplying Integers with Different Signs

Multiplying Multiple Integers Fluently

Integer Multiplication Word Problems

Integer Multiplication

体育运动中的数学现象与课题确立

400米标准跑道的结构剖析与周长计算

探究不同跑道起跑线的前申差计算公式

200米与400米赛跑起跑线设定的实地模拟

单循环赛制场次计算与对阵轮次编排

单淘汰赛制场次计算与晋级树状图编排

球类比赛积分表计算与排名积分模型

体育中的数学：赛道几何与赛制编排

Modeling Integer Division with Concrete Models

Dividing Integers Fluently

Integer Division Word Problems

Mixed Integer Operations Fluency

Integer Division and Mixed Operations

Calculating Theoretical Probabilities as Fractions, Decimals, and Percents

Calculating Probabilities of Complementary Events

Listing Systematic Sample Spaces for Single and Combined Events

Using Two-Way Grids and Tables to Find Sample Spaces

Constructing Tree Diagrams for Multi-Stage Experiments

Using Tree Diagrams to Calculate Compound Probabilities

Applying the Fundamental Counting Principle

Solving Compound Event Word Problems with Sample Spaces

Theoretical Probability and Sample Spaces

篮球投篮命中率与罚球命中率统计分析

运动员多维技术指标雷达图的绘制与解读

裁判打分规则剖析：截尾平均数与极值剔除原理

运动心率区间测算与科学锻炼强度评估

体育竞技数据的趋势预测与排兵布阵策略

校园体育节赛程规划与成绩统计综合设计

“体育中的数学”课题答辩、成果分享与心得交流

体育中的数学：竞技数据与运动表现分析

Recognizing Division by a Rational Number as Multiplying by Its Reciprocal

Using Reciprocals to Solve Division Problems

Using Fraction Notation in Division Equations

Determining if a Quantity Increases or Decreases When Multiplied by a Fraction

Predicting Results of Multiplying by Fractions Greater Than One

Predicting Results of Multiplying by Fractions Less Than One

Predicting Results of Multiplying by Fractions Equal to One

Division and Reciprocal Relationships

Understanding Additive Relationships (y = x + a)

Understanding Multiplicative Relationships (y = ax)

Comparing Additive and Multiplicative Relationships Verbally

Comparing Additive and Multiplicative Relationships in Tables

Comparing Additive and Multiplicative Relationships Graphically

Comparing Additive and Multiplicative Relationships Symbolically

Differentiating Additive and Multiplicative Relationships Across All Representations

OGM.7.SP.4

Aligned learning resources

Related diagrams