<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Handwriting Alignment Guide</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: transparent;
      color: #1e293b;
      padding: 12px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      overflow-x: hidden;
    }

    .diagram-container {
      width: 100%;
      max-width: 620px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    /* Legend header */
    .legend-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0 4px;
      font-size: 13px;
      font-weight: 700;
    }

    .legend-item {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .legend-item.correct {
      color: #15803d;
    }

    .legend-item.errors {
      color: #b91c1c;
    }

    /* SVG Canvas wrapper */
    .svg-wrapper {
      width: 100%;
      height: auto;
      background: transparent;
      display: block;
    }

    .svg-canvas {
      width: 100%;
      height: auto;
      display: block;
      overflow: visible;
    }

    /* Letter groups transition - smooth duration >= 500ms */
    .letter-group {
      transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1), filter 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    }

    /* Gentle, flicker-free animation effects */
    @keyframes softGreenGlow {
      0%, 100% {
        filter: drop-shadow(0 0 2px rgba(34, 197, 94, 0.25));
      }
      50% {
        filter: drop-shadow(0 0 7px rgba(34, 197, 94, 0.7));
      }
    }

    @keyframes pulseRedAura {
      0%, 100% {
        opacity: 0.35;
        stroke-width: 1.5;
      }
      50% {
        opacity: 0.85;
        stroke-width: 2.2;
      }
    }

    .glow-correct-target {
      animation: softGreenGlow 3.5s ease-in-out infinite;
    }

    .aura-circle {
      animation: pulseRedAura 3.2s ease-in-out infinite;
    }

    /* Interactive controls */
    .controls {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 4px;
    }

    .tab-btn {
      background: #f8fafc;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 7px 15px;
      font-size: 12px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: background-color 0.5s ease, color 0.5s ease, border-color 0.5s ease, box-shadow 0.5s ease;
      user-select: none;
    }

    .tab-btn:hover {
      background: #f1f5f9;
      color: #0f172a;
    }

    .tab-btn.active {
      background: #2563eb;
      color: #ffffff;
      border-color: #2563eb;
      box-shadow: 0 2px 6px rgba(37, 99, 235, 0.28);
    }

    /* Accessibility focus */
    .tab-btn:focus-visible {
      outline: 2px solid #2563eb;
      outline-offset: 2px;
    }

    @media (max-width: 420px) {
      .legend-bar {
        font-size: 11.5px;
      }
      .tab-btn {
        padding: 6px 11px;
        font-size: 11px;
      }
    }
  </style>
</head>
<body>

  <div class="diagram-container">
    
    <div class="legend-bar">
      <span class="legend-item correct">
        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"><polyline points="20 6 9 17 4 12"></polyline></svg>
        Correct Alignment
      </span>
      <span class="legend-item errors">
        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M10.29 3.86L1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z"></path><line x1="12" y1="9" x2="12" y2="13"></line><line x1="12" y1="17" x2="12.01" y2="17"></line></svg>
        Common Errors
      </span>
    </div>

    
    <div class="svg-wrapper">
      <svg class="svg-canvas" viewBox="0 0 600 256" xmlns="http://www.w3.org/2000/svg">
        <defs>
          <linearGradient id="gradTopLine" x1="0" y1="0" x2="1" y2="0">
            <stop offset="0%" stop-color="#3b82f6" stop-opacity="0.3"/>
            <stop offset="15%" stop-color="#2563eb" stop-opacity="1"/>
            <stop offset="100%" stop-color="#2563eb" stop-opacity="1"/>
          </linearGradient>
          <linearGradient id="gradBaseLine" x1="0" y1="0" x2="1" y2="0">
            <stop offset="0%" stop-color="#ef4444" stop-opacity="0.3"/>
            <stop offset="15%" stop-color="#dc2626" stop-opacity="1"/>
            <stop offset="100%" stop-color="#dc2626" stop-opacity="1"/>
          </linearGradient>
        </defs>

        
        <rect x="75" y="40" width="515" height="130" rx="6" fill="#f8fafc" opacity="0.6"/>

        
        
        <line x1="75" y1="45" x2="590" y2="45" stroke="url(#gradTopLine)" stroke-width="2.5" stroke-linecap="round"/>
        
        
        <line x1="75" y1="105" x2="590" y2="105" stroke="#94a3b8" stroke-width="2" stroke-dasharray="6,6" stroke-linecap="round"/>
        
        
        <line x1="75" y1="165" x2="590" y2="165" stroke="url(#gradBaseLine)" stroke-width="2.5" stroke-linecap="round"/>

        
        
        <rect x="4" y="34" width="64" height="20" rx="4" fill="#eff6ff"/>
        <text x="36" y="48" font-size="10" font-weight="700" fill="#1d4ed8" text-anchor="middle" font-family="system-ui, sans-serif">TOP LINE</text>

        
        <rect x="4" y="95" width="64" height="20" rx="4" fill="#f1f5f9"/>
        <text x="36" y="109" font-size="10" font-weight="700" fill="#475569" text-anchor="middle" font-family="system-ui, sans-serif">MIDLINE</text>

        
        <rect x="4" y="155" width="64" height="20" rx="4" fill="#fef2f2"/>
        <text x="36" y="169" font-size="10" font-weight="700" fill="#b91c1c" text-anchor="middle" font-family="system-ui, sans-serif">BASELINE</text>

        
        <line x1="385" y1="28" x2="385" y2="185" stroke="#cbd5e1" stroke-width="2" stroke-dasharray="4,4"/>

        
        <g id="letterTCorrect" class="letter-group correct-group glow-correct-target">
          <text x="135" y="165" font-family="'Courier New', Courier, monospace" font-size="136" font-weight="bold" fill="#0f172a" text-anchor="middle">T</text>
          
          <circle cx="135" cy="230" r="12" fill="#22c55e"/>
          <path d="M129 230 l4 4 l8 -8" fill="none" stroke="#ffffff" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"/>
        </g>

        
        <g id="letterLCorrect" class="letter-group correct-group glow-correct-target">
          <text x="235" y="165" font-family="'Courier New', Courier, monospace" font-size="136" font-weight="bold" fill="#0f172a" text-anchor="middle">L</text>
          
          <circle cx="235" cy="230" r="12" fill="#22c55e"/>
          <path d="M229 230 l4 4 l8 -8" fill="none" stroke="#ffffff" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"/>
        </g>

        
        <g id="letterMCorrect" class="letter-group correct-group glow-correct-target">
          <text x="335" y="165" font-family="'Courier New', Courier, monospace" font-size="136" font-weight="bold" fill="#0f172a" text-anchor="middle">M</text>
          
          <circle cx="335" cy="230" r="12" fill="#22c55e"/>
          <path d="M329 230 l4 4 l8 -8" fill="none" stroke="#ffffff" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"/>
        </g>

        
        <g id="letterTFloat" class="letter-group error-group">
          
          <circle class="aura-circle" cx="440" cy="154" r="22" fill="rgba(239, 68, 68, 0.12)" stroke="#ef4444" stroke-dasharray="3,3"/>
          
          <rect x="409" y="171" width="62" height="18" rx="4" fill="#fef2f2" stroke="#fecaca" stroke-width="1"/>
          <text x="440" y="184" font-size="9" font-weight="700" fill="#dc2626" text-anchor="middle" font-family="system-ui, sans-serif">FLOATING</text>
          
          <text x="440" y="140" font-family="'Courier New', Courier, monospace" font-size="136" font-weight="bold" fill="#991b1b" text-anchor="middle">T</text>
          
          <circle cx="440" cy="230" r="12" fill="#ef4444"/>
          <text x="440" y="235" font-size="14" font-weight="bold" fill="#ffffff" text-anchor="middle" font-family="system-ui, sans-serif">!</text>
        </g>

        
        <g id="letterLSink" class="letter-group error-group">
          
          <circle class="aura-circle" cx="535" cy="178" r="22" fill="rgba(239, 68, 68, 0.12)" stroke="#ef4444" stroke-dasharray="3,3"/>
          
          <text x="535" y="186" font-family="'Courier New', Courier, monospace" font-size="136" font-weight="bold" fill="#991b1b" text-anchor="middle">L</text>
          
          <rect x="506" y="195" width="58" height="18" rx="4" fill="#fef2f2" stroke="#fecaca" stroke-width="1"/>
          <text x="535" y="208" font-size="9" font-weight="700" fill="#dc2626" text-anchor="middle" font-family="system-ui, sans-serif">SINKING</text>
          
          <circle cx="535" cy="230" r="12" fill="#ef4444"/>
          <text x="535" y="235" font-size="14" font-weight="bold" fill="#ffffff" text-anchor="middle" font-family="system-ui, sans-serif">!</text>
        </g>
      </svg>
    </div>

    
    <div class="controls">
      <button type="button" class="tab-btn active" id="btnAll">
        Show All
      </button>
      <button type="button" class="tab-btn" id="btnCorrect">
        <svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"><polyline points="20 6 9 17 4 12"></polyline></svg>
        Perfect Fit
      </button>
      <button type="button" class="tab-btn" id="btnErrors">
        <svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"></circle><line x1="12" y1="8" x2="12" y2="12"></line><line x1="12" y1="16" x2="12.01" y2="16"></line></svg>
        Alignment Faults
      </button>
    </div>
  </div>

  <script>
    const btnAll = document.getElementById('btnAll');
    const btnCorrect = document.getElementById('btnCorrect');
    const btnErrors = document.getElementById('btnErrors');
    const buttons = [btnAll, btnCorrect, btnErrors];

    const correctGroups = document.querySelectorAll('.correct-group');
    const errorGroups = document.querySelectorAll('.error-group');

    function setActiveTab(activeBtn) {
      buttons.forEach(btn => btn.classList.remove('active'));
      activeBtn.classList.add('active');
    }

    btnAll.addEventListener('click', () => {
      setActiveTab(btnAll);
      correctGroups.forEach(el => {
        el.style.opacity = '1';
        el.style.filter = 'none';
        el.classList.add('glow-correct-target');
      });
      errorGroups.forEach(el => {
        el.style.opacity = '1';
        el.style.filter = 'none';
      });
    });

    btnCorrect.addEventListener('click', () => {
      setActiveTab(btnCorrect);
      correctGroups.forEach(el => {
        el.style.opacity = '1';
        el.classList.add('glow-correct-target');
      });
      errorGroups.forEach(el => {
        el.style.opacity = '0.15';
        el.style.filter = 'grayscale(100%)';
      });
    });

    btnErrors.addEventListener('click', () => {
      setActiveTab(btnErrors);
      correctGroups.forEach(el => {
        el.style.opacity = '0.15';
        el.classList.remove('glow-correct-target');
      });
      errorGroups.forEach(el => {
        el.style.opacity = '1';
        el.style.filter = 'none';
      });
    });
  </script>
</body>
</html>

Mastering Uppercase Letter Proportions and Baseline Alignment

<!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;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
    }

    .toolbar {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      justify-content: center;
      margin-bottom: 8px;
      z-index: 10;
    }

    .btn {
      padding: 6px 14px;
      font-size: 14px;
      font-weight: 600;
      border: 1px solid #d1d5db;
      border-radius: 20px;
      background: #f8fafc;
      color: #4b5563;
      cursor: pointer;
      box-shadow: none;
      transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
    }

    .btn.active {
      background: #ea580c;
      color: #ffffff;
      border-color: #ea580c;
    }

    .canvas-wrap {
      width: 100%;
      max-width: 580px;
      position: relative;
    }

    svg {
      width: 100%;
      height: auto;
      display: block;
    }

    /* Lined paper guidelines */
    .guideline-cap { stroke: #94a3b8; stroke-width: 2; }
    .guideline-mid { stroke: #f97316; stroke-width: 2.5; stroke-dasharray: 6 5; }
    .guideline-base { stroke: #64748b; stroke-width: 2.5; }
    .midline-glow { stroke: #fdba74; stroke-width: 8; opacity: 0.35; stroke-linecap: round; }

    /* Line guide labels */
    .line-label {
      font-size: 12px;
      font-weight: 600;
      fill: #64748b;
      user-select: none;
    }
    .line-label.mid {
      fill: #ea580c;
      font-weight: 700;
    }

    /* Letter strokes */
    .letter-stroke {
      stroke: #1e2945;
      stroke-width: 10;
      stroke-linecap: round;
      stroke-linejoin: round;
      fill: none;
      transition: stroke 0.3s ease, opacity 0.3s ease;
    }

    .letter-group {
      cursor: pointer;
    }

    .letter-group.dimmed .letter-stroke {
      opacity: 0.2;
    }

    .letter-group.dimmed .midline-marker {
      opacity: 0.15;
    }

    /* Alignment touchpoint dots */
    .midline-marker {
      transition: opacity 0.3s ease;
    }

    .marker-pulse {
      fill: #ea580c;
      opacity: 0.3;
      transform-origin: center;
      animation: pulse 2s infinite ease-out;
    }

    .marker-core {
      fill: #f97316;
      stroke: #ffffff;
      stroke-width: 2;
    }

    @keyframes pulse {
      0% { r: 6px; opacity: 0.6; }
      70% { r: 14px; opacity: 0; }
      100% { r: 14px; opacity: 0; }
    }
  </style>
</head>
<body>

  
  <div class="toolbar" id="btnGroup">
    <button class="btn active" data-target="all">All Letters</button>
    <button class="btn" data-target="h">H</button>
    <button class="btn" data-target="a">A</button>
    <button class="btn" data-target="b">B</button>
    <button class="btn" data-target="p">P</button>
  </div>

  
  <div class="canvas-wrap">
    <svg viewBox="0 0 540 280" aria-label="Uppercase letter alignment on ruled lines">
      
      
      
      <line x1="85" y1="60" x2="520" y2="60" class="guideline-cap" />
      <text x="12" y="64" class="line-label">Top Line</text>

      
      <line x1="85" y1="150" x2="520" y2="150" class="midline-glow" />
      <line x1="85" y1="150" x2="520" y2="150" class="guideline-mid" />
      <text x="12" y="154" class="line-label mid">Midline</text>

      
      <line x1="85" y1="240" x2="520" y2="240" class="guideline-base" />
      <text x="12" y="244" class="line-label">Baseline</text>

      
      <g id="letter-h" class="letter-group" data-letter="h">
        <line x1="115" y1="60" x2="115" y2="240" class="letter-stroke" />
        <line x1="165" y1="60" x2="165" y2="240" class="letter-stroke" />
        <line x1="115" y1="150" x2="165" y2="150" class="letter-stroke" />
        
        <g class="midline-marker" transform="translate(140, 150)">
          <circle class="marker-pulse" cx="0" cy="0" r="7" />
          <circle class="marker-core" cx="0" cy="0" r="5" />
        </g>
      </g>

      
      <g id="letter-a" class="letter-group" data-letter="a">
        <line x1="245" y1="60" x2="215" y2="240" class="letter-stroke" />
        <line x1="245" y1="60" x2="275" y2="240" class="letter-stroke" />
        <line x1="230" y1="150" x2="260" y2="150" class="letter-stroke" />
        
        <g class="midline-marker" transform="translate(245, 150)">
          <circle class="marker-pulse" cx="0" cy="0" r="7" />
          <circle class="marker-core" cx="0" cy="0" r="5" />
        </g>
      </g>

      
      <g id="letter-b" class="letter-group" data-letter="b">
        <line x1="335" y1="60" x2="335" y2="240" class="letter-stroke" />
        <path d="M 335 60 H 360 C 385 60, 385 150, 335 150" class="letter-stroke" />
        <path d="M 335 150 H 365 C 390 150, 390 240, 335 240" class="letter-stroke" />
        
        <g class="midline-marker" transform="translate(335, 150)">
          <circle class="marker-pulse" cx="0" cy="0" r="7" />
          <circle class="marker-core" cx="0" cy="0" r="5" />
        </g>
      </g>

      
      <g id="letter-p" class="letter-group" data-letter="p">
        <line x1="445" y1="60" x2="445" y2="240" class="letter-stroke" />
        <path d="M 445 60 H 475 C 502 60, 502 150, 445 150" class="letter-stroke" />
        
        <g class="midline-marker" transform="translate(445, 150)">
          <circle class="marker-pulse" cx="0" cy="0" r="7" />
          <circle class="marker-core" cx="0" cy="0" r="5" />
        </g>
      </g>
      
    </svg>
  </div>

  <script>
    const buttons = document.querySelectorAll('#btnGroup .btn');
    const letters = document.querySelectorAll('.letter-group');

    function setActive(target) {
      buttons.forEach(b => {
        b.classList.toggle('active', b.dataset.target === target);
      });

      letters.forEach(l => {
        if (target === 'all' || l.dataset.letter === target) {
          l.classList.remove('dimmed');
        } else {
          l.classList.add('dimmed');
        }
      });
    }

    buttons.forEach(btn => {
      btn.addEventListener('click', () => setActive(btn.dataset.target));
    });

    letters.forEach(ltr => {
      ltr.addEventListener('click', () => setActive(ltr.dataset.letter));
    });
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Vertical Stems Comparison</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #ffffff;
      color: #0f172a;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      padding: 12px 10px;
      user-select: none;
    }

    .container {
      width: 100%;
      max-width: 540px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 12px;
    }

    .toggle-row {
      display: flex;
      gap: 10px;
      justify-content: center;
      width: 100%;
    }

    .toggle-btn {
      background: #f1f5f9;
      border: 2px solid #cbd5e1;
      border-radius: 8px;
      padding: 7px 20px;
      font-size: 15px;
      font-weight: 700;
      color: #475569;
      cursor: pointer;
      transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
    }

    .toggle-btn:hover {
      background: #e2e8f0;
      border-color: #94a3b8;
    }

    .toggle-btn.active {
      background: #0284c7;
      border-color: #0284c7;
      color: #ffffff;
    }

    .cards-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      width: 100%;
    }

    .visual-card {
      border-radius: 12px;
      padding: 10px 8px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      border: 2px solid transparent;
    }

    .visual-card.correct {
      border-color: #86efac;
      background: #f0fdf4;
    }

    .visual-card.incorrect {
      border-color: #fca5a5;
      background: #fef2f2;
    }

    .card-label {
      font-size: 15px;
      font-weight: 800;
      display: flex;
      align-items: center;
      gap: 6px;
      margin-bottom: 6px;
      text-align: center;
    }

    .correct .card-label {
      color: #15803d;
    }

    .incorrect .card-label {
      color: #b91c1c;
    }

    .svg-container {
      width: 100%;
      max-width: 220px;
      aspect-ratio: 1 / 1;
    }

    svg {
      width: 100%;
      height: 100%;
      display: block;
    }

    .guideline {
      stroke: #94a3b8;
      stroke-width: 1.5;
    }

    .baseline {
      stroke: #0f172a;
      stroke-width: 2.5;
    }

    .midline {
      stroke: #94a3b8;
      stroke-width: 1.5;
      stroke-dasharray: 4 4;
    }

    .stem {
      stroke-width: 7;
      stroke-linecap: round;
      stroke-linejoin: round;
    }

    .stem-correct {
      stroke: #0f172a;
    }

    .stem-incorrect {
      stroke: #dc2626;
    }

    .guide-box {
      fill: none;
      stroke: #16a34a;
      stroke-width: 2;
    }

    .warning-guide {
      stroke: #f87171;
      stroke-width: 1.5;
      stroke-dasharray: 4 3;
    }

    .angle-text {
      font-family: system-ui, sans-serif;
      font-size: 13px;
      font-weight: 800;
      fill: #15803d;
      text-anchor: middle;
      dominant-baseline: central;
    }

    .warn-text {
      font-family: system-ui, sans-serif;
      font-size: 12px;
      font-weight: 800;
      fill: #dc2626;
      text-anchor: middle;
      dominant-baseline: central;
    }

    @media (max-width: 380px) {
      .card-label {
        font-size: 13px;
      }
      .toggle-btn {
        padding: 6px 14px;
        font-size: 14px;
      }
      .cards-grid {
        gap: 8px;
      }
    }
  </style>
</head>
<body>

  <div class="container">
    <div class="toggle-row">
      <button class="toggle-btn active" id="btnH" onclick="setLetter('H')">Letter H</button>
      <button class="toggle-btn" id="btnN" onclick="setLetter('N')">Letter N</button>
    </div>

    <div class="cards-grid">
      
      <div class="visual-card correct">
        <div class="card-label">✓ 90° Vertical</div>
        <div class="svg-container">
          <svg viewBox="0 0 160 160" id="svgCorrect">
            
            <line x1="8" y1="35" x2="152" y2="35" class="guideline" />
            <line x1="8" y1="80" x2="152" y2="80" class="midline" />
            <line x1="8" y1="125" x2="152" y2="125" class="baseline" />

            
            <g id="gCorrectLetter"></g>
          </svg>
        </div>
      </div>

      
      <div class="visual-card incorrect">
        <div class="card-label">✗ Slanted Tent</div>
        <div class="svg-container">
          <svg viewBox="0 0 160 160" id="svgIncorrect">
            
            <line x1="8" y1="35" x2="152" y2="35" class="guideline" />
            <line x1="8" y1="80" x2="152" y2="80" class="midline" />
            <line x1="8" y1="125" x2="152" y2="125" class="baseline" />

            
            <g id="gIncorrectLetter"></g>
          </svg>
        </div>
      </div>
    </div>
  </div>

  <script>
    function renderH() {
      // Correct H: Straight vertical stems at x=52 and x=108, single clean 90° label centered
      document.getElementById('gCorrectLetter').innerHTML = `
        
        <polyline points="52,112 65,112 65,125" class="guide-box" />

        
        <polyline points="108,112 95,112 95,125" class="guide-box" />

        
        <text x="80" y="117" class="angle-text">90°</text>

        
        <line x1="52" y1="35" x2="52" y2="125" class="stem stem-correct" />
        <line x1="108" y1="35" x2="108" y2="125" class="stem stem-correct" />
        <line x1="52" y1="80" x2="108" y2="80" class="stem stem-correct" />
      `;

      // Incorrect H: Slanted inward like a tent
      document.getElementById('gIncorrectLetter').innerHTML = `
        
        <line x1="42" y1="35" x2="42" y2="125" class="warning-guide" />
        <line x1="118" y1="35" x2="118" y2="125" class="warning-guide" />

        
        <path d="M 42,106 A 19,19 0 0,1 48,109" fill="none" stroke="#ef4444" stroke-width="2" />
        <path d="M 118,106 A 19,19 0 0,0 112,109" fill="none" stroke="#ef4444" stroke-width="2" />

        
        <line x1="62" y1="35" x2="42" y2="125" class="stem stem-incorrect" />
        <line x1="98" y1="35" x2="118" y2="125" class="stem stem-incorrect" />
        <line x1="52" y1="80" x2="108" y2="80" class="stem stem-incorrect" />

        <text x="80" y="22" class="warn-text">Leaning In</text>
      `;
    }

    function renderN() {
      // Correct N: Straight vertical stems at x=52 and x=108, single clean 90° label centered
      document.getElementById('gCorrectLetter').innerHTML = `
        
        <polyline points="52,112 65,112 65,125" class="guide-box" />

        
        <polyline points="108,112 95,112 95,125" class="guide-box" />

        
        <text x="80" y="117" class="angle-text">90°</text>

        
        <line x1="52" y1="35" x2="52" y2="125" class="stem stem-correct" />
        <line x1="52" y1="35" x2="108" y2="125" class="stem stem-correct" />
        <line x1="108" y1="35" x2="108" y2="125" class="stem stem-correct" />
      `;

      // Incorrect N: Stems tilted inward
      document.getElementById('gIncorrectLetter').innerHTML = `
        
        <line x1="42" y1="35" x2="42" y2="125" class="warning-guide" />
        <line x1="118" y1="35" x2="118" y2="125" class="warning-guide" />

        
        <path d="M 42,106 A 19,19 0 0,1 48,109" fill="none" stroke="#ef4444" stroke-width="2" />
        <path d="M 118,106 A 19,19 0 0,0 112,109" fill="none" stroke="#ef4444" stroke-width="2" />

        
        <line x1="62" y1="35" x2="42" y2="125" class="stem stem-incorrect" />
        <line x1="62" y1="35" x2="118" y2="125" class="stem stem-incorrect" />
        <line x1="98" y1="35" x2="118" y2="125" class="stem stem-incorrect" />

        <text x="80" y="22" class="warn-text">Leaning In</text>
      `;
    }

    function setLetter(letter) {
      if (letter === 'H') {
        document.getElementById('btnH').classList.add('active');
        document.getElementById('btnN').classList.remove('active');
        renderH();
      } else {
        document.getElementById('btnN').classList.add('active');
        document.getElementById('btnH').classList.remove('active');
        renderN();
      }
    }

    // Initialize
    renderH();
  </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">
  <title>Letter Proportions</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: transparent;
      color: #1e2945;
      padding: 12px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }

    .chart {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      width: 100%;
      max-width: 620px;
    }

    .column {
      display: flex;
      flex-direction: column;
      align-items: center;
      border-radius: 12px;
      padding: 10px 6px 12px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
    }

    .col-wide { background: #eff6ff; border-color: #bfdbfe; }
    .col-std { background: #f0fdfa; border-color: #99f6e4; }
    .col-narrow { background: #faf5ff; border-color: #e9d5ff; }

    .tag {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 8px;
    }
    .col-wide .tag { color: #1d4ed8; }
    .col-std .tag { color: #0f766e; }
    .col-narrow .tag { color: #7e22ce; }

    /* Writing grid & guidelines stage */
    .stage {
      position: relative;
      width: 100%;
      height: 160px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: #ffffff;
      border-radius: 8px;
      box-shadow: inset 0 0 0 1px rgba(0,0,0,0.06);
      overflow: hidden;
    }

    /* Guidelines across each stage */
    .guide {
      position: absolute;
      left: 0;
      right: 0;
      pointer-events: none;
      z-index: 1;
    }
    .guide-cap { top: 22px; border-top: 1px solid #94a3b8; }
    .guide-mid { top: 78px; border-top: 1px dashed #cbd5e1; }
    .guide-base { top: 134px; border-top: 2px solid #475569; }

    /* Guideline label text on left column only */
    .guide-lbl {
      position: absolute;
      left: 4px;
      font-size: 9px;
      font-weight: 600;
      color: #64748b;
      letter-spacing: 0.2px;
      text-transform: uppercase;
    }
    .lbl-cap { top: 9px; }
    .lbl-mid { top: 64px; }
    .lbl-base { top: 138px; color: #334155; }

    /* Letter Grid Box */
    .letter-box {
      position: relative;
      height: 112px; /* spans from cap to baseline: 134 - 22 */
      top: 0px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-family: "Courier New", Courier, monospace, system-ui;
      font-size: 88px;
      font-weight: 800;
      line-height: 1;
      z-index: 2;
      transition: all 0.25s ease;
      background-size: 16px 16px;
      border-radius: 4px;
    }

    /* Column Widths & Grid Colors */
    .col-wide .letter-box {
      width: 110px;
      color: #1e40af;
      background-color: rgba(59, 130, 246, 0.12);
      border: 2px solid #3b82f6;
      background-image: linear-gradient(to right, rgba(59, 130, 246, 0.15) 1px, transparent 1px),
                        linear-gradient(to bottom, rgba(59, 130, 246, 0.15) 1px, transparent 1px);
    }
    .col-std .letter-box {
      width: 82px;
      color: #115e59;
      background-color: rgba(20, 184, 166, 0.12);
      border: 2px solid #14b8a6;
      background-image: linear-gradient(to right, rgba(20, 184, 166, 0.15) 1px, transparent 1px),
                        linear-gradient(to bottom, rgba(20, 184, 166, 0.15) 1px, transparent 1px);
    }
    .col-narrow .letter-box {
      width: 52px;
      color: #6b21a8;
      background-color: rgba(168, 85, 247, 0.12);
      border: 2px solid #a855f7;
      background-image: linear-gradient(to right, rgba(168, 85, 247, 0.15) 1px, transparent 1px),
                        linear-gradient(to bottom, rgba(168, 85, 247, 0.15) 1px, transparent 1px);
    }

    /* Dimension labels below grid */
    .ratio-pill {
      font-size: 11px;
      font-weight: 700;
      padding: 3px 8px;
      border-radius: 12px;
      margin: 8px 0 6px;
    }
    .col-wide .ratio-pill { background: #dbeafe; color: #1e40af; }
    .col-std .ratio-pill { background: #ccfbf1; color: #0f766e; }
    .col-narrow .ratio-pill { background: #f3e8ff; color: #6b21a8; }

    /* Interactive letter picker pills */
    .chips {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 4px;
      width: 100%;
    }

    .chip {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      color: #475569;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 700;
      width: 26px;
      height: 26px;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      user-select: none;
      transition: background 0.15s, border-color 0.15s, color 0.15s;
    }

    .col-wide .chip.active { background: #2563eb; color: #ffffff; border-color: #2563eb; }
    .col-std .chip.active { background: #0d9488; color: #ffffff; border-color: #0d9488; }
    .col-narrow .chip.active { background: #7c3aed; color: #ffffff; border-color: #7c3aed; }
  </style>
</head>
<body>

  <div class="chart">
    
    <div class="column col-wide">
      <div class="tag">Extra-Wide</div>
      <div class="stage">
        <span class="guide-lbl lbl-cap">Cap</span>
        <div class="guide guide-cap"></div>
        <span class="guide-lbl lbl-mid">Mid</span>
        <div class="guide guide-mid"></div>
        <div class="guide guide-base"></div>
        <span class="guide-lbl lbl-base">Base</span>
        <div class="letter-box" id="box-wide">M</div>
      </div>
      <div class="ratio-pill">5 : 4 Wide</div>
      <div class="chips" id="chips-wide">
        <button class="chip active">M</button>
        <button class="chip">W</button>
      </div>
    </div>

    
    <div class="column col-std">
      <div class="tag">Standard</div>
      <div class="stage">
        <div class="guide guide-cap"></div>
        <div class="guide guide-mid"></div>
        <div class="guide guide-base"></div>
        <div class="letter-box" id="box-std">A</div>
      </div>
      <div class="ratio-pill">4 : 4 Square</div>
      <div class="chips" id="chips-std">
        <button class="chip active">A</button>
        <button class="chip">C</button>
        <button class="chip">D</button>
        <button class="chip">H</button>
        <button class="chip">O</button>
        <button class="chip">T</button>
      </div>
    </div>

    
    <div class="column col-narrow">
      <div class="tag">Narrow</div>
      <div class="stage">
        <div class="guide guide-cap"></div>
        <div class="guide guide-mid"></div>
        <div class="guide guide-base"></div>
        <div class="letter-box" id="box-narrow">I</div>
      </div>
      <div class="ratio-pill">2 : 4 Slender</div>
      <div class="chips" id="chips-narrow">
        <button class="chip active">I</button>
        <button class="chip">B</button>
        <button class="chip">E</button>
        <button class="chip">J</button>
        <button class="chip">L</button>
        <button class="chip">P</button>
      </div>
    </div>
  </div>

  <script>
    function setupPicker(containerId, boxId) {
      const container = document.getElementById(containerId);
      const box = document.getElementById(boxId);
      const buttons = container.querySelectorAll('.chip');

      buttons.forEach(btn => {
        btn.addEventListener('click', () => {
          buttons.forEach(b => b.classList.remove('active'));
          btn.classList.add('active');
          box.textContent = btn.textContent;
        });
      });
    }

    setupPicker('chips-wide', 'box-wide');
    setupPicker('chips-std', 'box-std');
    setupPicker('chips-narrow', 'box-narrow');
  </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 {
      background-color: #f8f9fa;
      color: #1e2945;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 12px;
    }

    .toolbar {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      justify-content: center;
      margin-bottom: 8px;
      width: 100%;
      max-width: 540px;
    }

    .btn {
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      color: #1e2945;
      padding: 6px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      box-shadow: 0 1px 2px rgba(0,0,0,0.04);
      transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    }

    .btn:hover {
      background: #f1f5f9;
    }

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

    .svg-container {
      width: 100%;
      max-width: 580px;
      aspect-ratio: 580 / 340;
    }

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

    /* Transition effects */
    .guideline, .house-part, .label-group {
      transition: opacity 0.25s ease, stroke-width 0.25s ease;
    }

    .dimmed {
      opacity: 0.22;
    }

    .highlighted {
      opacity: 1;
    }
  </style>
</head>
<body>

  <div class="toolbar">
    <button class="btn active" id="btn-all" onclick="setFocus('all')">Show All</button>
    <button class="btn" id="btn-top" onclick="setFocus('top')">Top Line (Roof)</button>
    <button class="btn" id="btn-mid" onclick="setFocus('mid')">Midline (Middle)</button>
    <button class="btn" id="btn-base" onclick="setFocus('base')">Baseline (Floor)</button>
  </div>

  <div class="svg-container">
    <svg viewBox="0 0 580 340" aria-label="Handwriting Guidelines Diagram">
      <defs>
        
        <filter id="soft-shadow" x="-8%" y="-8%" width="120%" height="120%">
          <feDropShadow dx="0" dy="2" stdDeviation="3" flood-color="#000" flood-opacity="0.06" />
        </filter>
      </defs>

      
      <g id="house-group" filter="url(#soft-shadow)">
        
        <rect id="zone-top" class="house-part" x="32" y="80" width="96" height="80" fill="#eff6ff" stroke="#cbd5e1" stroke-width="1.5" />
        
        <rect class="house-part" x="66" y="104" width="28" height="32" rx="3" fill="#ffffff" stroke="#93c5fd" stroke-width="2" />
        <line class="house-part" x1="80" y1="104" x2="80" y2="136" stroke="#93c5fd" stroke-width="1.5" />
        <line class="house-part" x1="66" y1="120" x2="94" y2="120" stroke="#93c5fd" stroke-width="1.5" />

        
        <rect id="zone-base" class="house-part" x="32" y="160" width="96" height="80" fill="#fff7ed" stroke="#cbd5e1" stroke-width="1.5" />
        
        <path class="house-part" d="M68,240 V184 A12,12 0 0,1 92,184 V240 Z" fill="#fed7aa" stroke="#ea580c" stroke-width="2" />
        <circle class="house-part" cx="88" cy="214" r="2" fill="#9a3412" />

        
        <polygon id="zone-roof" class="house-part" points="80,24 20,80 140,80" fill="#dbeafe" stroke="#2563eb" stroke-width="2.5" stroke-linejoin="round" />
        <path class="house-part" d="M80,44 L70,56 H90 Z" fill="#93c5fd" />
      </g>

      
      <g id="lines-group">
        
        <line id="line-top" class="guideline" x1="20" y1="80" x2="560" y2="80" stroke="#2563eb" stroke-width="3.5" stroke-linecap="round" />
        
        
        <line id="line-mid" class="guideline" x1="32" y1="160" x2="560" y2="160" stroke="#64748b" stroke-width="2.5" stroke-dasharray="9 7" stroke-linecap="round" />
        
        
        <line id="line-base" class="guideline" x1="20" y1="240" x2="560" y2="240" stroke="#c2410c" stroke-width="3.5" stroke-linecap="round" />
      </g>

      
      <g id="letters-group" opacity="0.95">
        
        <path d="M 185,240 L 215,80 L 245,240" fill="none" stroke="#1e2945" stroke-width="10" stroke-linecap="round" stroke-linejoin="round" />
        <line x1="197" y1="160" x2="233" y2="160" stroke="#1e2945" stroke-width="9" stroke-linecap="round" />

        
        <line x1="290" y1="80" x2="290" y2="240" stroke="#1e2945" stroke-width="10" stroke-linecap="round" />
        <line x1="340" y1="80" x2="340" y2="240" stroke="#1e2945" stroke-width="10" stroke-linecap="round" />
        <line x1="290" y1="160" x2="340" y2="160" stroke="#1e2945" stroke-width="9" stroke-linecap="round" />

        
        <circle cx="400" cy="200" r="40" fill="none" stroke="#64748b" stroke-width="8" />
        <line x1="440" y1="160" x2="440" y2="240" stroke="#64748b" stroke-width="8" stroke-linecap="round" />
      </g>

      
      <g id="labels-group">
        
        <g id="label-top" class="label-group">
          <rect x="445" y="58" width="125" height="24" rx="12" fill="#eff6ff" stroke="#2563eb" stroke-width="1.5" />
          <text x="507" y="74" fill="#1e40af" font-size="12" font-weight="700" text-anchor="middle">Top Line (Roof)</text>
        </g>

        
        <g id="label-mid" class="label-group">
          <rect x="445" y="148" width="125" height="24" rx="12" fill="#f1f5f9" stroke="#64748b" stroke-width="1.5" />
          <text x="507" y="164" fill="#334155" font-size="12" font-weight="700" text-anchor="middle">Midline (Middle)</text>
        </g>

        
        <g id="label-base" class="label-group">
          <rect x="445" y="228" width="125" height="24" rx="12" fill="#fff7ed" stroke="#c2410c" stroke-width="1.5" />
          <text x="507" y="244" fill="#9a3412" font-size="12" font-weight="700" text-anchor="middle">Baseline (Floor)</text>
        </g>
      </g>

      
      <g id="indicators-group" stroke="#94a3b8" stroke-width="1.5" opacity="0.6">
        
        <path d="M 155,80 H 148 V 240 H 155" fill="none" />
        <text x="142" y="164" fill="#64748b" font-size="11" font-weight="600" text-anchor="end">Tall</text>
      </g>
    </svg>
  </div>

  <script>
    function setFocus(type) {
      // Update active button state
      document.querySelectorAll('.btn').forEach(btn => btn.classList.remove('active'));
      const activeBtn = document.getElementById('btn-' + type);
      if (activeBtn) activeBtn.classList.add('active');

      const elements = {
        top: {
          lines: ['line-top'],
          labels: ['label-top'],
          house: ['zone-roof']
        },
        mid: {
          lines: ['line-mid'],
          labels: ['label-mid'],
          house: ['zone-top']
        },
        base: {
          lines: ['line-base'],
          labels: ['label-base'],
          house: ['zone-base']
        }
      };

      const allLineIds = ['line-top', 'line-mid', 'line-base'];
      const allLabelIds = ['label-top', 'label-mid', 'label-base'];
      const allHouseIds = ['zone-roof', 'zone-top', 'zone-base'];

      if (type === 'all') {
        allLineIds.forEach(id => {
          const el = document.getElementById(id);
          if (el) el.classList.remove('dimmed');
        });
        allLabelIds.forEach(id => {
          const el = document.getElementById(id);
          if (el) el.classList.remove('dimmed');
        });
        document.querySelectorAll('.house-part').forEach(el => el.classList.remove('dimmed'));
        return;
      }

      const activeGroup = elements[type];

      // Dim or highlight lines
      allLineIds.forEach(id => {
        const el = document.getElementById(id);
        if (el) {
          if (activeGroup.lines.includes(id)) {
            el.classList.remove('dimmed');
            el.classList.add('highlighted');
          } else {
            el.classList.add('dimmed');
            el.classList.remove('highlighted');
          }
        }
      });

      // Dim or highlight labels
      allLabelIds.forEach(id => {
        const el = document.getElementById(id);
        if (el) {
          if (activeGroup.labels.includes(id)) {
            el.classList.remove('dimmed');
            el.classList.add('highlighted');
          } else {
            el.classList.add('dimmed');
            el.classList.remove('highlighted');
          }
        }
      });

      // Dim or highlight house parts
      document.querySelectorAll('.house-part').forEach(el => {
        if (activeGroup.house.includes(el.id)) {
          el.classList.remove('dimmed');
          el.classList.add('highlighted');
        } else {
          el.classList.add('dimmed');
          el.classList.remove('highlighted');
        }
      });
    }
  </script>
</body>
</html>

OGE.3.W.7

Aligned learning resources

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