<!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: #ffffff;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 16px;
      min-height: 100%;
      user-select: none;
    }

    .main-wrap {
      width: 100%;
      max-width: 520px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 16px;
    }

    /* SVG Canvas */
    .canvas-container {
      width: 100%;
      aspect-ratio: 520 / 150;
      position: relative;
    }
    svg {
      width: 100%;
      height: 100%;
      overflow: visible;
    }

    /* Interactive / animated arrows */
    .infinite-wave {
      stroke-dasharray: 8, 8;
      animation: dash 1.5s linear infinite;
    }
    @keyframes dash {
      to {
        stroke-dashoffset: -16;
      }
    }

    /* Notation Box */
    .notation-display {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
      background: #f8fafc;
      border: 1.5px solid #e2e8f0;
      border-radius: 12px;
      padding: 12px 24px;
      width: 100%;
      max-width: 360px;
      text-align: center;
    }

    .symbol-stack {
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      line-height: 1;
    }

    .line-arrow-symbol {
      width: 58px;
      height: 14px;
      color: #0284c7;
    }

    .letter-symbols {
      font-size: 32px;
      font-weight: 800;
      letter-spacing: 3px;
      color: #1e2945;
      margin-top: -2px;
      transition: color 0.25s ease;
    }

    .annotation-text {
      font-size: 13px;
      font-weight: 600;
      color: #0284c7;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    /* Badge & Toggle */
    .badge-wrap {
      display: flex;
      align-items: center;
      gap: 10px;
      background: #f1f5f9;
      border-radius: 999px;
      padding: 6px 14px;
      cursor: pointer;
      border: 1px solid #cbd5e1;
      transition: background-color 0.2s ease, border-color 0.2s ease;
    }
    .badge-wrap:hover {
      background: #e2e8f0;
      border-color: #94a3b8;
    }

    .badge-symbol {
      font-weight: 700;
      font-size: 15px;
      color: #0f172a;
      display: inline-flex;
      flex-direction: column;
      align-items: center;
    }

    .badge-sub {
      font-size: 12px;
      font-weight: 600;
      color: #475569;
    }

    .swap-btn {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      padding: 3px 8px;
      font-size: 12px;
      font-weight: 700;
      color: #0284c7;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
  </style>
</head>
<body>

  <div class="main-wrap">
    
    <div class="canvas-container">
      <svg viewBox="0 0 520 150">
        <defs>
          <marker id="arrow-left" viewBox="0 0 10 10" refX="1" refY="5" markerWidth="8" markerHeight="8" orient="auto">
            <path d="M 9 1 L 1 5 L 9 9 z" fill="#0284c7" />
          </marker>
          <marker id="arrow-right" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="8" markerHeight="8" orient="auto">
            <path d="M 1 1 L 9 5 L 1 9 z" fill="#0284c7" />
          </marker>
        </defs>

        
        <line x1="28" y1="75" x2="492" y2="75" stroke="#bae6fd" stroke-width="8" stroke-linecap="round" />

        
        <line x1="30" y1="75" x2="490" y2="75" stroke="#0284c7" stroke-width="4" marker-start="url(#arrow-left)" marker-end="url(#arrow-right)" />

        
        <g id="pointAGroup" style="transition: transform 0.3s ease;">
          <circle id="dotA" cx="170" cy="75" r="7" fill="#0f172a" stroke="#ffffff" stroke-width="2" />
          <text id="labelA" x="170" y="45" text-anchor="middle" font-size="22" font-weight="800" fill="#0f172a">A</text>
        </g>

        
        <g id="pointBGroup" style="transition: transform 0.3s ease;">
          <circle id="dotB" cx="350" cy="75" r="7" fill="#0f172a" stroke="#ffffff" stroke-width="2" />
          <text id="labelB" x="350" y="45" text-anchor="middle" font-size="22" font-weight="800" fill="#0f172a">B</text>
        </g>
      </svg>
    </div>

    
    <div class="notation-display">
      <div class="symbol-stack">
        
        <svg class="line-arrow-symbol" viewBox="0 0 58 14">
          <defs>
            <marker id="mini-left" viewBox="0 0 8 8" refX="1" refY="4" markerWidth="6" markerHeight="6" orient="auto">
              <path d="M 7 1 L 1 4 L 7 7 z" fill="#0284c7" />
            </marker>
            <marker id="mini-right" viewBox="0 0 8 8" refX="7" refY="4" markerWidth="6" markerHeight="6" orient="auto">
              <path d="M 1 1 L 7 4 L 1 7 z" fill="#0284c7" />
            </marker>
          </defs>
          <line x1="4" y1="7" x2="54" y2="7" stroke="#0284c7" stroke-width="2" marker-start="url(#mini-left)" marker-end="url(#mini-right)" />
        </svg>
        <div id="mainNotation" class="letter-symbols">AB</div>
      </div>
      <div class="annotation-text">
        <span>⟵ Extends forever both directions ⟶</span>
      </div>
    </div>

    
    <div id="badge" class="badge-wrap" title="Click to swap point order">
      <span class="badge-sub">Same line:</span>
      <span id="altNotation" class="badge-symbol">
        <svg style="width:34px; height:8px;" viewBox="0 0 58 14">
          <line x1="4" y1="7" x2="54" y2="7" stroke="#475569" stroke-width="2" marker-start="url(#mini-left)" marker-end="url(#mini-right)" />
        </svg>
        <span id="altLetters">BA</span>
      </span>
      <span class="badge-sub">(order does not matter)</span>
      <span class="swap-btn">⇄ Swap</span>
    </div>
  </div>

  <script>
    let isReversed = false;
    const mainNotation = document.getElementById('mainNotation');
    const altLetters = document.getElementById('altLetters');
    const badge = document.getElementById('badge');
    const labelA = document.getElementById('labelA');
    const labelB = document.getElementById('labelB');

    function toggleOrder() {
      isReversed = !isReversed;
      if (isReversed) {
        mainNotation.textContent = 'BA';
        altLetters.textContent = 'AB';
        labelA.textContent = 'B';
        labelB.textContent = 'A';
      } else {
        mainNotation.textContent = 'AB';
        altLetters.textContent = 'BA';
        labelA.textContent = 'A';
        labelB.textContent = 'B';
      }
    }

    badge.addEventListener('click', toggleOrder);
  </script>
</body>
</html>

Identifying Points, Lines, Rays, and Line Segments

<!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;
      background: #ffffff;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      padding: 10px 8px;
      user-select: none;
      overflow-x: hidden;
    }
    .diagram-svg {
      width: 100%;
      max-width: 460px;
      height: auto;
      display: block;
    }
    .btn-group {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 6px;
      margin-top: 10px;
      max-width: 100%;
    }
    .pill {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      color: #475569;
      padding: 4px 10px;
      border-radius: 999px;
      font-size: 12px;
      font-weight: 600;
      cursor: pointer;
      transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
      white-space: nowrap;
    }
    .pill:hover {
      background: #e2e8f0;
    }
    .pill.active {
      background: #0284c7;
      border-color: #0284c7;
      color: #ffffff;
    }
    /* Highlight states */
    .hl-dots .endpoint {
      fill: #f59e0b;
      r: 8px;
    }
    .hl-ruler .ruler-box {
      stroke: #0284c7;
      stroke-width: 2px;
    }
    .hl-ruler .measure-text {
      fill: #0284c7;
      font-weight: 700;
    }
    .hl-bar .bar-line {
      stroke: #f59e0b;
      stroke-width: 3.5px;
    }
  </style>
</head>
<body>

  <svg class="diagram-svg" viewBox="0 0 460 310" xmlns="http://www.w3.org/2000/svg" id="diagram">
    <defs>
      
      <marker id="arrow" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
        <path d="M 0 1.5 L 8 5 L 0 8.5 z" fill="#0284c7" />
      </marker>
    </defs>

    
    
    <line x1="90" y1="58" x2="90" y2="105" stroke="#94a3b8" stroke-width="1.5" stroke-dasharray="3 3" />
    <line x1="370" y1="58" x2="370" y2="105" stroke="#94a3b8" stroke-width="1.5" stroke-dasharray="3 3" />

    
    <line x1="90" y1="58" x2="370" y2="58" stroke="#0284c7" stroke-width="4" stroke-linecap="round" />

    
    <circle id="dotC" class="endpoint" cx="90" cy="58" r="6" fill="#0284c7" style="transition: all .3s ease;" />
    <text x="90" y="38" text-anchor="middle" font-size="18" font-weight="700" fill="#1e2945">C</text>

    
    <circle id="dotD" class="endpoint" cx="370" cy="58" r="6" fill="#0284c7" style="transition: all .3s ease;" />
    <text x="370" y="38" text-anchor="middle" font-size="18" font-weight="700" fill="#1e2945">D</text>

    
    
    <g id="rulerGroup">
      <rect class="ruler-box" x="70" y="105" width="325" height="42" rx="4" fill="#f8fafc" stroke="#cbd5e1" stroke-width="1.5" style="transition: all .3s ease;" />
      
      
      
      <line x1="90" y1="105" x2="90" y2="124" stroke="#475569" stroke-width="2" />
      <text x="90" y="138" text-anchor="middle" font-size="11" font-weight="600" fill="#475569">0</text>

      
      <line x1="136.7" y1="105" x2="136.7" y2="119" stroke="#64748b" stroke-width="1.5" />
      <text x="136.7" y="136" text-anchor="middle" font-size="10" fill="#64748b">1</text>

      
      <line x1="183.3" y1="105" x2="183.3" y2="119" stroke="#64748b" stroke-width="1.5" />
      <text x="183.3" y="136" text-anchor="middle" font-size="10" fill="#64748b">2</text>

      
      <line x1="230" y1="105" x2="230" y2="119" stroke="#64748b" stroke-width="1.5" />
      <text x="230" y="136" text-anchor="middle" font-size="10" fill="#64748b">3</text>

      
      <line x1="276.7" y1="105" x2="276.7" y2="119" stroke="#64748b" stroke-width="1.5" />
      <text x="276.7" y="136" text-anchor="middle" font-size="10" fill="#64748b">4</text>

      
      <line x1="323.3" y1="105" x2="323.3" y2="119" stroke="#64748b" stroke-width="1.5" />
      <text x="323.3" y="136" text-anchor="middle" font-size="10" fill="#64748b">5</text>

      
      <line x1="370" y1="105" x2="370" y2="124" stroke="#475569" stroke-width="2" />
      <text x="370" y="138" text-anchor="middle" font-size="11" font-weight="600" fill="#475569">6</text>

      
      <text x="75" y="117" text-anchor="start" font-size="9" font-weight="700" fill="#94a3b8">cm</text>

      
      <line x1="113.3" y1="105" x2="113.3" y2="114" stroke="#94a3b8" stroke-width="1" />
      <line x1="160" y1="105" x2="160" y2="114" stroke="#94a3b8" stroke-width="1" />
      <line x1="206.7" y1="105" x2="206.7" y2="114" stroke="#94a3b8" stroke-width="1" />
      <line x1="253.3" y1="105" x2="253.3" y2="114" stroke="#94a3b8" stroke-width="1" />
      <line x1="300" y1="105" x2="300" y2="114" stroke="#94a3b8" stroke-width="1" />
      <line x1="346.7" y1="105" x2="346.7" y2="114" stroke="#94a3b8" stroke-width="1" />

      
      <text class="measure-text" x="230" y="165" text-anchor="middle" font-size="13" font-weight="600" fill="#0f766e">Length = 6 cm</text>
    </g>

    
    <g id="notationGroup">
      
      <rect x="75" y="196" width="95" height="64" rx="8" fill="#f1f5f9" stroke="#e2e8f0" stroke-width="1.5" />
      
      
      <line class="bar-line" x1="104" y1="216" x2="142" y2="216" stroke="#1e2945" stroke-width="2.5" stroke-linecap="butt" style="transition: all .3s ease;" />
      <text x="123" y="242" text-anchor="middle" font-size="22" font-weight="700" fill="#1e2945" letter-spacing="2">CD</text>

      
      <path d="M 205 218 C 175 214, 160 215, 146 216" fill="none" stroke="#0284c7" stroke-width="1.5" marker-end="url(#arrow)" />
      
      
      <text x="212" y="217" font-size="13" font-weight="700" fill="#0284c7">Bar has no arrows</text>
      <text x="212" y="236" font-size="12" font-weight="500" fill="#475569">Fixed length with two endpoints.</text>
    </g>
  </svg>

  
  <div class="btn-group">
    <button class="pill active" onclick="setMode(event, 'all')">Show All</button>
    <button class="pill" onclick="setMode(event, 'dots')">Endpoints</button>
    <button class="pill" onclick="setMode(event, 'ruler')">Measurement</button>
    <button class="pill" onclick="setMode(event, 'bar')">Notation</button>
  </div>

  <script>
    const diagram = document.getElementById('diagram');
    const pills = document.querySelectorAll('.pill');

    function setMode(e, mode) {
      pills.forEach(p => p.classList.remove('active'));
      e.currentTarget.classList.add('active');

      diagram.classList.remove('hl-dots', 'hl-ruler', 'hl-bar');
      if (mode === 'dots') diagram.classList.add('hl-dots');
      if (mode === 'ruler') diagram.classList.add('hl-ruler');
      if (mode === 'bar') diagram.classList.add('hl-bar');
    }
  </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;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #ffffff;
      color: #1e293b;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 12px 16px;
      gap: 10px;
    }

    /* Top Section: Visual Ray */
    .ray-visual {
      width: 100%;
      max-width: 440px;
      height: 90px;
      position: relative;
    }

    .ray-svg {
      width: 100%;
      height: 100%;
      overflow: visible;
    }

    /* Notation Breakdown */
    .anatomy-section {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      width: 100%;
      max-width: 440px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 8px 12px 10px;
      position: relative;
    }

    .notation-display {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 32px;
      font-weight: 800;
      line-height: 1;
      letter-spacing: 2px;
      user-select: none;
    }

    .ray-symbol-top {
      font-size: 24px;
      line-height: 0.8;
      color: #2563eb;
      margin-bottom: 2px;
    }

    .letters-row {
      display: flex;
      gap: 4px;
    }

    .letter-e {
      color: #059669;
    }

    .letter-f {
      color: #4f46e5;
    }

    .callout-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 8px;
      width: 100%;
      margin-top: 8px;
    }

    .callout-pill {
      font-size: 13px;
      font-weight: 600;
      padding: 5px 8px;
      border-radius: 8px;
      text-align: center;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
    }

    .pill-start {
      background: #ecfdf5;
      color: #047857;
      border: 1px solid #a7f3d0;
    }

    .pill-through {
      background: #eef2ff;
      color: #4338ca;
      border: 1px solid #c7d2fe;
    }

    /* Bottom Comparison Cards */
    .cards-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      width: 100%;
      max-width: 440px;
    }

    .status-card {
      border-radius: 10px;
      padding: 10px 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      gap: 4px;
    }

    .card-correct {
      background: #ecfdf5;
      border: 1.5px solid #10b981;
      color: #065f46;
    }

    .card-incorrect {
      background: #fff1f2;
      border: 1.5px solid #f43f5e;
      color: #9f1239;
    }

    .card-symbol {
      font-size: 20px;
      font-weight: 800;
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      line-height: 1;
    }

    .card-symbol .top-arr {
      font-size: 16px;
      line-height: 0.8;
    }

    .card-status {
      font-size: 13px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    /* Animations */
    @keyframes beamPulse {
      0% { stroke-dashoffset: 24; }
      100% { stroke-dashoffset: 0; }
    }

    .flow-line {
      stroke-dasharray: 6 6;
      animation: beamPulse 1.2s linear infinite;
    }
  </style>
</head>
<body>

  
  <div class="ray-visual">
    <svg class="ray-svg" viewBox="0 0 380 80">
      <defs>
        <marker id="ray-arrow" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
          <path d="M 1 1 L 9 5 L 1 9 z" fill="#2563eb" />
        </marker>
      </defs>

      
      <line x1="50" y1="36" x2="340" y2="36" stroke="#2563eb" stroke-width="4" stroke-linecap="round" marker-end="url(#ray-arrow)" />
      
      
      <line class="flow-line" x1="56" y1="36" x2="330" y2="36" stroke="#93c5fd" stroke-width="2" stroke-linecap="round" />

      
      <circle cx="50" cy="36" r="6" fill="#059669" stroke="#ffffff" stroke-width="2" />
      <text x="50" y="20" font-size="15" font-weight="800" fill="#059669" text-anchor="middle">E</text>
      
      
      <circle cx="210" cy="36" r="5" fill="#4f46e5" stroke="#ffffff" stroke-width="2" />
      <text x="210" y="20" font-size="15" font-weight="800" fill="#4f46e5" text-anchor="middle">F</text>

      
      <rect x="18" y="52" width="64" height="20" rx="4" fill="#ecfdf5" stroke="#a7f3d0" stroke-width="1"/>
      <text x="50" y="66" font-size="10" font-weight="700" fill="#047857" text-anchor="middle">Endpoint</text>

      <rect x="175" y="52" width="70" height="20" rx="4" fill="#eef2ff" stroke="#c7d2fe" stroke-width="1"/>
      <text x="210" y="66" font-size="10" font-weight="700" fill="#4338ca" text-anchor="middle">Direction</text>
    </svg>
  </div>

  
  <div class="anatomy-section">
    <div class="notation-display">
      <span class="ray-symbol-top">→</span>
      <div class="letters-row">
        <span class="letter-e">E</span>
        <span class="letter-f">F</span>
      </div>
    </div>

    <div class="callout-grid">
      <div class="callout-pill pill-start">
        <span>1st:</span> <strong>Endpoint (E)</strong>
      </div>
      <div class="callout-pill pill-through">
        <span>2nd:</span> <strong>Path Point (F)</strong>
      </div>
    </div>
  </div>

  
  <div class="cards-row">
    <div class="status-card card-correct">
      <div class="card-symbol">
        <span class="top-arr">→</span>
        <span>EF</span>
      </div>
      <div class="card-status">✓ Correct</div>
    </div>

    <div class="status-card card-incorrect">
      <div class="card-symbol">
        <span class="top-arr">→</span>
        <span>FE</span>
      </div>
      <div class="card-status">✕ Incorrect</div>
    </div>
  </div>

</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="1:1">
  <title>Points, Lines, Segments, and Rays</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      background: transparent;
      color: #1e2945;
      padding: 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }

    .grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      width: 100%;
      max-width: 520px;
    }

    .geo-card {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      cursor: pointer;
      user-select: none;
      transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
    }

    .geo-card:hover, .geo-card.active {
      border-color: #22b7ff;
      box-shadow: 0 4px 12px rgba(34, 183, 255, 0.18);
    }

    .card-header {
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      width: 100%;
      margin-bottom: 4px;
      padding: 0 4px;
    }

    .title {
      font-size: 14px;
      font-weight: 700;
      color: #1e2945;
    }

    .notation {
      font-size: 14px;
      font-weight: 600;
      color: #0284c7;
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      line-height: 1;
    }

    .notation-symbol {
      font-size: 12px;
      line-height: 0.8;
      margin-bottom: 1px;
    }

    .canvas-container {
      width: 100%;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 4px 0;
    }

    svg {
      width: 100%;
      height: 100%;
      overflow: visible;
    }

    .rule-tags {
      display: flex;
      gap: 6px;
      width: 100%;
      justify-content: center;
      margin-top: 4px;
      flex-wrap: wrap;
    }

    .tag {
      font-size: 11px;
      font-weight: 600;
      padding: 3px 6px;
      border-radius: 6px;
      background: #f1f5f9;
      color: #475569;
      white-space: nowrap;
    }

    .geo-card.active .tag-accent {
      background: #e0f2fe;
      color: #0369a1;
    }

    @media (max-width: 360px) {
      .grid {
        gap: 8px;
      }
      .geo-card {
        padding: 8px 6px;
      }
      .title {
        font-size: 12px;
      }
      .notation {
        font-size: 12px;
      }
      .tag {
        font-size: 10px;
        padding: 2px 4px;
      }
      .canvas-container {
        height: 60px;
      }
    }
  </style>
</head>
<body>

  <div class="grid">
    
    <div class="geo-card active" onclick="selectCard(this)">
      <div class="card-header">
        <span class="title">Point</span>
        <span class="notation">Point P</span>
      </div>
      <div class="canvas-container">
        <svg viewBox="0 0 160 60">
          
          <circle cx="80" cy="30" r="5.5" fill="#0284c7" />
          <text x="80" y="20" font-size="13" font-weight="700" fill="#1e2945" text-anchor="middle">P</text>
        </svg>
      </div>
      <div class="rule-tags">
        <span class="tag tag-accent">0 arrows</span>
        <span class="tag tag-accent">1 location</span>
      </div>
    </div>

    
    <div class="geo-card" onclick="selectCard(this)">
      <div class="card-header">
        <span class="title">Line</span>
        <span class="notation">
          <span class="notation-symbol">⟷</span>
          <span>AB</span>
        </span>
      </div>
      <div class="canvas-container">
        <svg viewBox="0 0 160 60">
          <defs>
            
            <marker id="arrow-left" viewBox="0 0 10 10" refX="2" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
              <path d="M 9 1.5 L 2 5 L 9 8.5 z" fill="#0284c7"/>
            </marker>
            
            <marker id="arrow-right" viewBox="0 0 10 10" refX="8" refY="5" markerWidth="6" markerHeight="6" orient="auto">
              <path d="M 1 1.5 L 8 5 L 1 8.5 z" fill="#0284c7"/>
            </marker>
          </defs>
          
          <line x1="14" y1="30" x2="146" y2="30" stroke="#0284c7" stroke-width="2.5" marker-start="url(#arrow-left)" marker-end="url(#arrow-right)"/>
          
          <circle cx="55" cy="30" r="4.5" fill="#0284c7" />
          <text x="55" y="20" font-size="12" font-weight="700" fill="#1e2945" text-anchor="middle">A</text>
          
          <circle cx="105" cy="30" r="4.5" fill="#0284c7" />
          <text x="105" y="20" font-size="12" font-weight="700" fill="#1e2945" text-anchor="middle">B</text>
        </svg>
      </div>
      <div class="rule-tags">
        <span class="tag tag-accent">2 arrows</span>
        <span class="tag tag-accent">0 endpoints</span>
      </div>
    </div>

    
    <div class="geo-card" onclick="selectCard(this)">
      <div class="card-header">
        <span class="title">Segment</span>
        <span class="notation">
          <span class="notation-symbol" style="letter-spacing: -1px; font-weight: bold;">—</span>
          <span>CD</span>
        </span>
      </div>
      <div class="canvas-container">
        <svg viewBox="0 0 160 60">
          
          <line x1="40" y1="30" x2="120" y2="30" stroke="#0284c7" stroke-width="2.5" stroke-linecap="round"/>
          
          <circle cx="40" cy="30" r="5" fill="#0284c7" />
          <text x="40" y="20" font-size="12" font-weight="700" fill="#1e2945" text-anchor="middle">C</text>
          
          <circle cx="120" cy="30" r="5" fill="#0284c7" />
          <text x="120" y="20" font-size="12" font-weight="700" fill="#1e2945" text-anchor="middle">D</text>
        </svg>
      </div>
      <div class="rule-tags">
        <span class="tag tag-accent">0 arrows</span>
        <span class="tag tag-accent">2 endpoints</span>
      </div>
    </div>

    
    <div class="geo-card" onclick="selectCard(this)">
      <div class="card-header">
        <span class="title">Ray</span>
        <span class="notation">
          <span class="notation-symbol">⟶</span>
          <span>EF</span>
        </span>
      </div>
      <div class="canvas-container">
        <svg viewBox="0 0 160 60">
          
          <line x1="35" y1="30" x2="140" y2="30" stroke="#0284c7" stroke-width="2.5" marker-end="url(#arrow-right)"/>
          
          <circle cx="35" cy="30" r="5" fill="#0284c7" />
          <text x="35" y="20" font-size="12" font-weight="700" fill="#1e2945" text-anchor="middle">E</text>
          
          <circle cx="95" cy="30" r="4.5" fill="#0284c7" />
          <text x="95" y="20" font-size="12" font-weight="700" fill="#1e2945" text-anchor="middle">F</text>
        </svg>
      </div>
      <div class="rule-tags">
        <span class="tag tag-accent">1 endpoint</span>
        <span class="tag tag-accent">1 arrow</span>
      </div>
    </div>
  </div>

  <script>
    function selectCard(card) {
      document.querySelectorAll('.geo-card').forEach(c => c.classList.remove('active'));
      card.classList.add('active');
    }
  </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 {
      width: 100%;
      min-height: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      padding: 12px 12px 16px;
      overflow-x: hidden;
    }

    /* Grid Area */
    .grid-stage {
      position: relative;
      width: 100%;
      max-width: 480px;
      height: 250px;
      background-color: #ffffff;
      background-image: 
        linear-gradient(to right, rgba(226, 232, 240, 0.8) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(226, 232, 240, 0.8) 1px, transparent 1px);
      background-size: 24px 24px;
      background-position: center center;
      border: 1px solid #cbd5e1;
      border-radius: 12px;
      cursor: crosshair;
      touch-action: none;
      overflow: hidden;
    }

    /* Interactive Point Marker */
    .point-container {
      position: absolute;
      transform: translate(-50%, -50%);
      display: flex;
      flex-direction: column;
      align-items: center;
      pointer-events: none;
      transition: transform 0.08s ease-out;
    }

    .pulse-ring {
      position: absolute;
      width: 32px;
      height: 32px;
      top: -4px;
      left: -4px;
      border-radius: 50%;
      background: rgba(34, 183, 255, 0.25);
      animation: pulse 2.4s ease-out infinite;
    }

    @keyframes pulse {
      0% { transform: scale(0.6); opacity: 0.9; }
      100% { transform: scale(1.8); opacity: 0; }
    }

    .point-dot {
      width: 16px;
      height: 16px;
      background: #0284c7;
      border: 3px solid #ffffff;
      box-shadow: 0 2px 6px rgba(2, 132, 199, 0.45);
      border-radius: 50%;
      position: relative;
      z-index: 2;
    }

    .point-letter {
      position: absolute;
      top: -24px;
      left: 14px;
      font-size: 20px;
      font-weight: 800;
      color: #0369a1;
      line-height: 1;
      text-shadow: 0 1px 2px rgba(255, 255, 255, 0.9);
      z-index: 3;
    }

    /* Floating Tooltip inside Grid */
    .dimension-tag {
      position: absolute;
      top: 10px;
      left: 50%;
      transform: translateX(-50%);
      background: rgba(255, 255, 255, 0.92);
      border: 1px solid #bae6fd;
      color: #0369a1;
      font-size: 13px;
      font-weight: 600;
      padding: 5px 12px;
      border-radius: 20px;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
      pointer-events: none;
      white-space: nowrap;
    }

    .hint-text {
      position: absolute;
      bottom: 8px;
      right: 12px;
      font-size: 11px;
      font-weight: 500;
      color: #64748b;
      pointer-events: none;
    }

    /* Notation & Details Card */
    .info-card {
      width: 100%;
      max-width: 480px;
      margin-top: 12px;
      display: flex;
      align-items: center;
      justify-content: space-around;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      padding: 10px 14px;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.03);
    }

    .info-group {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
    }

    .info-label {
      font-size: 11px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      font-weight: 600;
      color: #64748b;
    }

    .info-value {
      font-size: 18px;
      font-weight: 700;
      color: #0f172a;
    }

    .divider {
      width: 1px;
      height: 28px;
      background: #e2e8f0;
    }
  </style>
</head>
<body>

  
  <div class="grid-stage" id="gridStage">
    <div class="dimension-tag">Zero Dimensions • Exact Location</div>
    
    <div class="point-container" id="pointMarker" style="left: 50%; top: 52%;">
      <div class="pulse-ring"></div>
      <div class="point-dot"></div>
      <span class="point-letter">A</span>
    </div>

    <div class="hint-text">✦ Tap grid to move</div>
  </div>

  
  <div class="info-card">
    <div class="info-group">
      <span class="info-label">Name</span>
      <span class="info-value">Point A</span>
    </div>
    <div class="divider"></div>
    <div class="info-group">
      <span class="info-label">Notation</span>
      <span class="info-value">• A</span>
    </div>
  </div>

  <script>
    const stage = document.getElementById('gridStage');
    const marker = document.getElementById('pointMarker');

    function updatePoint(e) {
      const rect = stage.getBoundingClientRect();
      const clientX = e.touches ? e.touches[0].clientX : e.clientX;
      const clientY = e.touches ? e.touches[0].clientY : e.clientY;

      let x = clientX - rect.left;
      let y = clientY - rect.top;

      // Keep within bounds with padding
      x = Math.max(20, Math.min(rect.width - 24, x));
      y = Math.max(36, Math.min(rect.height - 20, y));

      const xPercent = (x / rect.width) * 100;
      const yPercent = (y / rect.height) * 100;

      marker.style.left = xPercent + '%';
      marker.style.top = yPercent + '%';
    }

    stage.addEventListener('pointerdown', (e) => {
      updatePoint(e);
      const onMove = (ev) => updatePoint(ev);
      const onUp = () => {
        window.removeEventListener('pointermove', onMove);
        window.removeEventListener('pointerup', onUp);
      };
      window.addEventListener('pointermove', onMove);
      window.addEventListener('pointerup', onUp);
    });
  </script>
</body>
</html>

OGM.6.GM.3

Aligned learning resources

Related diagrams