<!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">
  <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: #f8fafc;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }

    .builder {
      width: 100%;
      max-width: 480px;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .header-row {
      display: grid;
      grid-template-columns: 1fr 24px 1.1fr 24px 1.2fr;
      text-align: center;
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: #64748b;
      padding: 0 6px;
    }

    .formula-card {
      display: grid;
      grid-template-columns: 1fr 24px 1.1fr 24px 1.2fr;
      align-items: center;
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 8px;
      cursor: pointer;
      user-select: none;
      transition: border-color 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease;
    }

    .formula-card.active {
      border-color: #0ea5e9;
      box-shadow: 0 4px 12px rgba(14, 165, 233, 0.15);
      background: #f0f9ff;
    }

    .box {
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
      font-weight: 600;
      padding: 6px 4px;
      border-radius: 8px;
      text-align: center;
      min-height: 36px;
    }

    .base-box {
      background: #f1f5f9;
      color: #334155;
      border: 1px solid #cbd5e1;
    }

    .op {
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      font-weight: 700;
      color: #94a3b8;
    }

    .suffix-badge {
      font-weight: 700;
      border-radius: 8px;
      padding: 6px 4px;
    }

    .badge-purple {
      background: #f3e8ff;
      color: #7e22ce;
      border: 1px dashed #c084fc;
    }

    .badge-blue {
      background: #e0f2fe;
      color: #0369a1;
      border: 1px dashed #7dd3fc;
    }

    .badge-amber {
      background: #fef3c7;
      color: #b45309;
      border: 1px dashed #fcd34d;
    }

    .result-box {
      background: #ffffff;
      border: 1.5px solid #cbd5e1;
      color: #0f172a;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    }

    .formula-card.active .result-box {
      border-color: #0ea5e9;
      font-weight: 700;
    }

    .highlight-purple {
      color: #7e22ce;
      font-weight: 800;
    }

    .highlight-blue {
      color: #0369a1;
      font-weight: 800;
    }

    .highlight-amber {
      color: #b45309;
      font-weight: 800;
    }

    .controls {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 8px;
      margin-top: 4px;
    }

    .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #cbd5e1;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s;
    }

    .dot.active {
      background: #0ea5e9;
      transform: scale(1.25);
    }
  </style>
</head>
<body>

  <div class="builder">
    <div class="header-row">
      <span>Base Verb</span>
      <span></span>
      <span>Suffix</span>
      <span></span>
      <span>Past Tense</span>
    </div>

    
    <div class="formula-card active" data-index="0">
      <div class="box base-box">dance</div>
      <div class="op">+</div>
      <div class="box suffix-badge badge-purple">-d</div>
      <div class="op">=</div>
      <div class="box result-box">
        dance<span class="highlight-purple">d</span>
      </div>
    </div>

    
    <div class="formula-card" data-index="1">
      <div class="box base-box">jump</div>
      <div class="op">+</div>
      <div class="box suffix-badge badge-blue">-ed</div>
      <div class="op">=</div>
      <div class="box result-box">
        jump<span class="highlight-blue">ed</span>
      </div>
    </div>

    
    <div class="formula-card" data-index="2">
      <div class="box base-box">clap</div>
      <div class="op">+</div>
      <div class="box suffix-badge badge-amber">p + -ed</div>
      <div class="op">=</div>
      <div class="box result-box">
        clap<span class="highlight-amber">ped</span>
      </div>
    </div>

    <div class="controls">
      <div class="dot active" data-index="0"></div>
      <div class="dot" data-index="1"></div>
      <div class="dot" data-index="2"></div>
    </div>
  </div>

  <script>
    const cards = document.querySelectorAll('.formula-card');
    const dots = document.querySelectorAll('.dot');
    let currentIndex = 0;
    let autoPlayInterval;

    function selectStep(index) {
      currentIndex = index;
      cards.forEach((card, i) => {
        card.classList.toggle('active', i === index);
      });
      dots.forEach((dot, i) => {
        dot.classList.toggle('active', i === index);
      });
    }

    function startAutoPlay() {
      autoPlayInterval = setInterval(() => {
        const nextIndex = (currentIndex + 1) % cards.length;
        selectStep(nextIndex);
      }, 3200);
    }

    function resetAutoPlay() {
      clearInterval(autoPlayInterval);
      startAutoPlay();
    }

    cards.forEach((card, index) => {
      card.addEventListener('click', () => {
        selectStep(index);
        resetAutoPlay();
      });
    });

    dots.forEach((dot, index) => {
      dot.addEventListener('click', () => {
        selectStep(index);
        resetAutoPlay();
      });
    });

    startAutoPlay();
  </script>
</body>
</html>

Forming Simple Present, Past, and Future Tense Verbs

<!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: 16px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }

    .diagram {
      width: 100%;
      max-width: 580px;
      display: flex;
      flex-direction: column;
      gap: 20px;
      align-items: center;
    }

    /* Top row: context calendar */
    .top-bar {
      width: 100%;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0 4px;
    }

    .rule-title {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: #7c3aed;
      background: #f5f3ff;
      padding: 4px 10px;
      border-radius: 999px;
    }

    .calendar-card {
      display: flex;
      align-items: center;
      gap: 8px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      padding: 6px 12px;
      font-size: 13px;
      font-weight: 600;
    }

    .cal-icon {
      position: relative;
      width: 32px;
      height: 34px;
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    }

    .cal-top {
      background: #ef4444;
      height: 10px;
      width: 100%;
    }

    .cal-body {
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 13px;
      font-weight: 800;
      color: #1e2945;
      position: relative;
    }

    .circle-mark {
      position: absolute;
      width: 20px;
      height: 20px;
      border: 2px solid #7c3aed;
      border-radius: 50%;
    }

    /* Equation formula */
    .equation-container {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      flex-wrap: wrap;
      padding: 8px 0;
    }

    .badge {
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 10px 18px;
      border-radius: 12px;
      font-size: 20px;
      font-weight: 800;
      line-height: 1.1;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
    }

    .badge-sub {
      font-size: 11px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-top: 3px;
      opacity: 0.9;
    }

    .badge-will {
      background: #7c3aed;
      color: #ffffff;
    }

    .badge-verb {
      background: #0284c7;
      color: #ffffff;
      transition: background-color 0.2s ease;
    }

    .symbol {
      font-size: 24px;
      font-weight: 700;
      color: #94a3b8;
    }

    /* Sentence output card */
    .result-card {
      width: 100%;
      background: #f8fafc;
      border: 2px solid #e2e8f0;
      border-radius: 16px;
      padding: 16px 20px;
      text-align: center;
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    }

    .sentence {
      font-size: 19px;
      font-weight: 600;
      color: #334155;
      line-height: 1.4;
    }

    .hl-will {
      color: #7c3aed;
      font-weight: 800;
      background: #f5f3ff;
      padding: 2px 6px;
      border-radius: 6px;
    }

    .hl-verb {
      color: #0284c7;
      font-weight: 800;
      background: #e0f2fe;
      padding: 2px 6px;
      border-radius: 6px;
    }

    .hl-time {
      color: #475569;
      text-decoration: underline;
      text-decoration-color: #cbd5e1;
      text-underline-offset: 4px;
    }

    /* Interactive verb selector */
    .selector-bar {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .verb-btn {
      appearance: none;
      border: 1px solid #cbd5e1;
      background: #ffffff;
      color: #475569;
      font-size: 14px;
      font-weight: 700;
      padding: 6px 14px;
      border-radius: 999px;
      cursor: pointer;
      box-shadow: 0 1px 2px rgba(0,0,0,0.04);
      transition: all 0.2s ease;
    }

    .verb-btn.active {
      background: #0284c7;
      color: #ffffff;
      border-color: #0284c7;
      box-shadow: 0 2px 8px rgba(2, 132, 199, 0.3);
    }

    @media (max-width: 420px) {
      .badge {
        font-size: 17px;
        padding: 8px 14px;
      }
      .sentence {
        font-size: 16px;
      }
      .symbol {
        font-size: 20px;
      }
    }
  </style>
</head>
<body>

  <div class="diagram">
    
    <div class="top-bar">
      <span class="rule-title">Future Tense</span>
      <div class="calendar-card">
        <div class="cal-icon">
          <div class="cal-top"></div>
          <div class="cal-body">
            15
            <div class="circle-mark"></div>
          </div>
        </div>
        <span>Tomorrow</span>
      </div>
    </div>

    
    <div class="equation-container">
      <div class="badge badge-will">
        <span>will</span>
        <span class="badge-sub">Future</span>
      </div>

      <span class="symbol">+</span>

      <div class="badge badge-verb" id="verbBadge">
        <span id="verbText">paint</span>
        <span class="badge-sub">Base Verb</span>
      </div>

      <span class="symbol">➔</span>
    </div>

    
    <div class="result-card">
      <div class="sentence" id="sentenceOutput">
        Maya <span class="hl-will">will</span> <span class="hl-verb" id="sentenceVerb">paint</span> a picture <span class="hl-time">tomorrow</span>.
      </div>
    </div>

    
    <div class="selector-bar">
      <button class="verb-btn active" onclick="setVerb('paint', 'a picture')">paint 🎨</button>
      <button class="verb-btn" onclick="setVerb('read', 'a story')">read 📖</button>
      <button class="verb-btn" onclick="setVerb('build', 'a fort')">build 🏰</button>
    </div>
  </div>

  <script>
    function setVerb(verb, object) {
      document.getElementById('verbText').textContent = verb;
      document.getElementById('sentenceVerb').textContent = verb;
      document.getElementById('sentenceOutput').innerHTML = 
        `Maya <span class="hl-will">will</span> <span class="hl-verb">${verb}</span> ${object} <span class="hl-time">tomorrow</span>.`;

      const buttons = document.querySelectorAll('.verb-btn');
      buttons.forEach(btn => {
        if (btn.textContent.includes(verb)) {
          btn.classList.add('active');
        } else {
          btn.classList.remove('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;
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: transparent;
      color: #1e2945;
      padding: 8px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      min-height: 100%;
    }
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      width: 100%;
    }
    @media (max-width: 480px) {
      .cards-grid {
        grid-template-columns: 1fr;
        gap: 8px;
      }
    }
    .tense-card {
      background: #ffffff;
      border-radius: 12px;
      border: 2px solid #e2e8f0;
      padding: 12px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      transition: box-shadow 0.25s ease, border-color 0.25s ease;
      cursor: pointer;
      user-select: none;
    }
    .tense-card:active {
      background: #f8fafc;
    }

    /* Past - Amber */
    .card-past {
      border-color: #fde68a;
      background: linear-gradient(180deg, #fffbeb 0%, #ffffff 100%);
    }
    .card-past.active, .card-past:hover {
      border-color: #d97706;
      box-shadow: 0 4px 12px rgba(217, 119, 6, 0.15);
    }
    .badge-past {
      background: #fef3c7;
      color: #b45309;
    }
    .hl-past {
      color: #b45309;
      font-weight: 700;
      background: #fef3c7;
      padding: 1px 4px;
      border-radius: 4px;
    }

    /* Present - Blue */
    .card-present {
      border-color: #bfdbfe;
      background: linear-gradient(180deg, #eff6ff 0%, #ffffff 100%);
    }
    .card-present.active, .card-present:hover {
      border-color: #2563eb;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
    }
    .badge-present {
      background: #dbeafe;
      color: #1d4ed8;
    }
    .hl-present {
      color: #1d4ed8;
      font-weight: 700;
      background: #dbeafe;
      padding: 1px 4px;
      border-radius: 4px;
    }

    /* Future - Purple */
    .card-future {
      border-color: #e9d5ff;
      background: linear-gradient(180deg, #faf5ff 0%, #ffffff 100%);
    }
    .card-future.active, .card-future:hover {
      border-color: #9333ea;
      box-shadow: 0 4px 12px rgba(147, 51, 234, 0.15);
    }
    .badge-future {
      background: #f3e8ff;
      color: #7e22ce;
    }
    .hl-future {
      color: #7e22ce;
      font-weight: 700;
      background: #f3e8ff;
      padding: 1px 4px;
      border-radius: 4px;
    }

    .badge {
      font-size: 11px;
      font-weight: 800;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      padding: 3px 8px;
      border-radius: 12px;
      margin-bottom: 8px;
    }
    .icon-box {
      width: 64px;
      height: 64px;
      margin: 4px 0 8px 0;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .icon-box svg {
      width: 100%;
      height: 100%;
    }
    .time-label {
      font-size: 12px;
      font-weight: 600;
      color: #64748b;
      margin-bottom: 4px;
    }
    .sentence {
      font-size: 14px;
      line-height: 1.35;
      color: #1e2945;
    }
    .rule-tag {
      margin-top: 8px;
      font-size: 12px;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 6px;
      border: 1px dashed currentColor;
    }
  </style>
</head>
<body>

  <div class="cards-grid">
    
    <div class="tense-card card-past active" onclick="selectCard(this)">
      <span class="badge badge-past">Past</span>
      <div class="icon-box">
        <svg viewBox="0 0 64 64" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round">
          
          <line x1="8" y1="44" x2="56" y2="44" stroke="#d97706" stroke-width="2.5" stroke-dasharray="2 2" />
          <path d="M12 52h40" stroke="#b45309" stroke-width="2" />
          
          <ellipse cx="32" cy="46" rx="5" ry="3.5" fill="#d97706" stroke="#b45309" stroke-width="1.5" />
          <path d="M32 43 Q 32 32 25 28" stroke="#16a34a" stroke-width="2.5" />
          <path d="M25 28 Q 29 23 34 26 Q 30 31 25 28 Z" fill="#22c55e" stroke="#16a34a" stroke-width="1.5" />
        </svg>
      </div>
      <div class="time-label">Yesterday</div>
      <div class="sentence">Leo <span class="hl-past">planted</span> seeds.</div>
      <div class="rule-tag badge-past">+ed</div>
    </div>

    
    <div class="tense-card card-present" onclick="selectCard(this)">
      <span class="badge badge-present">Present</span>
      <div class="icon-box">
        <svg viewBox="0 0 64 64" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round">
          
          <line x1="10" y1="52" x2="54" y2="52" stroke="#2563eb" stroke-width="2" />
          
          <path d="M32 52 Q 32 38 32 28" stroke="#16a34a" stroke-width="2.5" />
          <path d="M32 40 Q 22 36 22 30 Q 28 32 32 37" fill="#22c55e" stroke="#16a34a" stroke-width="1.5" />
          <path d="M32 36 Q 42 32 42 26 Q 36 28 32 33" fill="#22c55e" stroke="#16a34a" stroke-width="1.5" />
          
          <circle cx="32" cy="20" r="5" fill="#facc15" stroke="#eab308" stroke-width="1.5" />
          <circle cx="32" cy="12" r="4.5" fill="#38bdf8" stroke="#0284c7" stroke-width="1.5" />
          <circle cx="32" cy="28" r="4.5" fill="#38bdf8" stroke="#0284c7" stroke-width="1.5" />
          <circle cx="24" cy="20" r="4.5" fill="#38bdf8" stroke="#0284c7" stroke-width="1.5" />
          <circle cx="40" cy="20" r="4.5" fill="#38bdf8" stroke="#0284c7" stroke-width="1.5" />
        </svg>
      </div>
      <div class="time-label">Today</div>
      <div class="sentence">Leo <span class="hl-present">plants</span> flowers.</div>
      <div class="rule-tag badge-present">+s</div>
    </div>

    
    <div class="tense-card card-future" onclick="selectCard(this)">
      <span class="badge badge-future">Future</span>
      <div class="icon-box">
        <svg viewBox="0 0 64 64" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round">
          
          <line x1="8" y1="52" x2="44" y2="52" stroke="#9333ea" stroke-width="2" />
          
          <path d="M22 52 L22 34 L26 34 L26 52 Z" fill="#92400e" stroke="#78350f" stroke-width="1.5" />
          
          <path d="M24 10 C 14 10 10 18 12 24 C 8 28 10 36 16 38 C 20 40 28 40 32 38 C 38 36 40 28 36 24 C 38 18 34 10 24 10 Z" fill="#dcfce7" stroke="#16a34a" stroke-width="2" stroke-dasharray="3 2" />
          
          <line x1="48" y1="28" x2="52" y2="44" stroke="#64748b" stroke-width="2" />
          <path d="M45 26 L51 28" stroke="#64748b" stroke-width="2" />
          <path d="M49 44 L55 46 L53 52 L47 50 Z" fill="#94a3b8" stroke="#475569" stroke-width="1.5" />
        </svg>
      </div>
      <div class="time-label">Tomorrow</div>
      <div class="sentence">Leo <span class="hl-future">will plant</span> a tree.</div>
      <div class="rule-tag badge-future">will + verb</div>
    </div>
  </div>

  <script>
    function selectCard(el) {
      document.querySelectorAll('.tense-card').forEach(c => c.classList.remove('active'));
      el.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; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #ffffff;
      color: #1e2945;
      padding: 16px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      user-select: none;
    }

    .timeline-container {
      width: 100%;
      max-width: 520px;
      margin-top: 10px;
      position: relative;
    }

    /* Robot Stage & Slider Track */
    .track-wrapper {
      position: relative;
      height: 70px;
      margin-bottom: 8px;
    }

    .track-line {
      position: absolute;
      bottom: 12px;
      left: 16.66%;
      right: 16.66%;
      height: 6px;
      background: #e2e8f0;
      border-radius: 999px;
      z-index: 1;
    }

    .track-fill {
      position: absolute;
      top: 0;
      left: 0;
      height: 100%;
      width: 0%;
      border-radius: 999px;
      transition: width 0.4s ease, background-color 0.4s ease;
    }

    .robot {
      position: absolute;
      bottom: 2px;
      left: 16.66%;
      transform: translateX(-50%);
      font-size: 38px;
      line-height: 1;
      z-index: 3;
      transition: left 0.4s cubic-bezier(0.34, 1.3, 0.64, 1);
      filter: drop-shadow(0 4px 6px rgba(0,0,0,0.15));
      cursor: pointer;
    }

    /* Step Zone Selector Buttons */
    .zones-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 8px;
      width: 100%;
      max-width: 520px;
    }

    .zone-btn {
      background: #f8fafc;
      border: 2px solid transparent;
      border-radius: 12px;
      padding: 10px 4px;
      text-align: center;
      cursor: pointer;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
    }

    .zone-btn .time-label {
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      opacity: 0.7;
    }

    .zone-btn .tense-title {
      font-size: 15px;
      font-weight: 800;
    }

    /* Past Active */
    .zone-btn[data-tense="past"].active {
      background: #fffbeb;
      border-color: #f59e0b;
      box-shadow: 0 4px 12px rgba(245, 158, 11, 0.2);
    }
    .zone-btn[data-tense="past"].active .tense-title { color: #b45309; }
    .zone-btn[data-tense="past"].active .time-label { color: #d97706; opacity: 1; }

    /* Present Active */
    .zone-btn[data-tense="present"].active {
      background: #f0f9ff;
      border-color: #0ea5e9;
      box-shadow: 0 4px 12px rgba(14, 165, 233, 0.2);
    }
    .zone-btn[data-tense="present"].active .tense-title { color: #0369a1; }
    .zone-btn[data-tense="present"].active .time-label { color: #0284c7; opacity: 1; }

    /* Future Active */
    .zone-btn[data-tense="future"].active {
      background: #faf5ff;
      border-color: #8b5cf6;
      box-shadow: 0 4px 12px rgba(139, 92, 246, 0.2);
    }
    .zone-btn[data-tense="future"].active .tense-title { color: #6d28d9; }
    .zone-btn[data-tense="future"].active .time-label { color: #7c3aed; opacity: 1; }

    /* Focus Verb Display Banner */
    .display-card {
      width: 100%;
      max-width: 520px;
      border-radius: 16px;
      padding: 16px 12px;
      text-align: center;
      margin: 12px 0;
      transition: all 0.35s ease;
      background: #f8fafc;
      border: 2px solid #e2e8f0;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 86px;
    }

    .verb-formula {
      font-size: 26px;
      font-weight: 800;
      letter-spacing: -0.02em;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
    }

    .tag {
      display: inline-block;
      padding: 2px 8px;
      border-radius: 6px;
      font-weight: 800;
    }

    /* Color States for Display */
    .display-card.past {
      background: #fffbeb;
      border-color: #f59e0b;
    }
    .display-card.past .highlight {
      color: #b45309;
      background: #fde68a;
    }

    .display-card.present {
      background: #f0f9ff;
      border-color: #0ea5e9;
    }
    .display-card.present .highlight {
      color: #0369a1;
      background: #bae6fd;
    }

    .display-card.future {
      background: #faf5ff;
      border-color: #8b5cf6;
    }
    .display-card.future .highlight {
      color: #6d28d9;
      background: #ddd6fe;
    }

    /* Bottom 3 Summary Pills */
    .cards-row {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 8px;
      width: 100%;
      max-width: 520px;
    }

    .mini-card {
      padding: 8px 4px;
      border-radius: 10px;
      text-align: center;
      background: #f8fafc;
      border: 1.5px solid #e2e8f0;
      font-size: 13px;
      font-weight: 600;
      color: #64748b;
      transition: all 0.3s ease;
      cursor: pointer;
    }

    .mini-card strong {
      display: block;
      font-size: 14px;
      color: #1e2945;
      margin-top: 2px;
    }

    .mini-card.active-past {
      border-color: #f59e0b;
      background: #fffbeb;
      color: #b45309;
    }
    .mini-card.active-past strong { color: #b45309; }

    .mini-card.active-present {
      border-color: #0ea5e9;
      background: #f0f9ff;
      color: #0369a1;
    }
    .mini-card.active-present strong { color: #0369a1; }

    .mini-card.active-future {
      border-color: #8b5cf6;
      background: #faf5ff;
      color: #6d28d9;
    }
    .mini-card.active-future strong { color: #6d28d9; }
  </style>
</head>
<body>

  
  <div class="timeline-container">
    <div class="track-wrapper">
      <div class="track-line">
        <div id="trackFill" class="track-fill"></div>
      </div>
      <div id="robot" class="robot" title="Time Machine Robot">🤖</div>
    </div>

    <div class="zones-grid">
      <div class="zone-btn active" data-tense="past" onclick="setTense(0)">
        <span class="time-label">Yesterday</span>
        <span class="tense-title">Past</span>
      </div>
      <div class="zone-btn" data-tense="present" onclick="setTense(1)">
        <span class="time-label">Today</span>
        <span class="tense-title">Present</span>
      </div>
      <div class="zone-btn" data-tense="future" onclick="setTense(2)">
        <span class="time-label">Tomorrow</span>
        <span class="tense-title">Future</span>
      </div>
    </div>
  </div>

  
  <div id="displayCard" class="display-card past">
    <div id="verbFormula" class="verb-formula">
      <span>walk</span><span class="tag highlight">ed</span>
    </div>
  </div>

  
  <div class="cards-row">
    <div class="mini-card active-past" id="mini0" onclick="setTense(0)">
      Past
      <strong>walked</strong>
    </div>
    <div class="mini-card" id="mini1" onclick="setTense(1)">
      Present
      <strong>walks / walk</strong>
    </div>
    <div class="mini-card" id="mini2" onclick="setTense(2)">
      Future
      <strong>will walk</strong>
    </div>
  </div>

  <script>
    const data = [
      {
        tense: 'past',
        pos: '16.66%',
        fill: '0%',
        color: '#f59e0b',
        html: '<span>walk</span><span class="tag highlight">ed</span>'
      },
      {
        tense: 'present',
        pos: '50%',
        fill: '50%',
        color: '#0ea5e9',
        html: '<span>walk</span><span class="tag highlight">s</span> / <span>walk</span>'
      },
      {
        tense: 'future',
        pos: '83.33%',
        fill: '100%',
        color: '#8b5cf6',
        html: '<span class="tag highlight">will</span> <span>walk</span>'
      }
    ];

    let currentIndex = 0;
    const robot = document.getElementById('robot');
    const trackFill = document.getElementById('trackFill');
    const displayCard = document.getElementById('displayCard');
    const verbFormula = document.getElementById('verbFormula');
    const zoneBtns = document.querySelectorAll('.zone-btn');
    const miniCards = [
      document.getElementById('mini0'),
      document.getElementById('mini1'),
      document.getElementById('mini2')
    ];

    function setTense(idx) {
      currentIndex = idx;
      const item = data[idx];

      // Update Robot & Track
      robot.style.left = item.pos;
      trackFill.style.width = item.fill;
      trackFill.style.backgroundColor = item.color;

      // Update Zone Buttons
      zoneBtns.forEach((btn, i) => {
        btn.classList.toggle('active', i === idx);
      });

      // Update Display Card
      displayCard.className = 'display-card ' + item.tense;
      verbFormula.innerHTML = item.html;

      // Update Mini Cards
      miniCards.forEach((card, i) => {
        card.className = 'mini-card';
        if (i === idx) {
          card.classList.add('active-' + item.tense);
        }
      });
    }

    // Auto-cycle gently every 3.5 seconds
    let autoTimer = setInterval(() => {
      setTense((currentIndex + 1) % 3);
    }, 3500);

    // Pause auto-cycle on user interaction
    document.body.addEventListener('click', () => {
      clearInterval(autoTimer);
    }, { once: true });
  </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;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    body {
      padding: 12px;
      color: #1e2945;
      background: #ffffff;
    }

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

    @media (max-width: 420px) {
      .grid-wrap {
        grid-template-columns: 1fr;
      }
    }

    .column-card {
      background: #ffffff;
      border: 1px solid #e6e6e6;
      border-radius: 12px;
      padding: 14px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .header-pill {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      font-size: 14px;
      font-weight: 700;
      padding: 8px 10px;
      border-radius: 8px;
      text-align: center;
    }

    .blue-header {
      background: #e0f2fe;
      color: #0369a1;
      border: 1px solid #bae6fd;
    }

    .orange-header {
      background: #ffedd5;
      color: #c2410c;
      border: 1px solid #fed7aa;
    }

    .rule-box {
      font-size: 12px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      text-align: center;
      padding: 4px 8px;
      border-radius: 6px;
      background: #f8fafc;
      border: 1px dashed #cbd5e1;
      color: #64748b;
    }

    .example-list {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .example-item {
      background: #f8fafc;
      border: 1px solid #f1f5f9;
      border-radius: 8px;
      padding: 10px 12px;
      font-size: 15px;
      font-weight: 500;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .verb-blue {
      color: #0284c7;
      font-weight: 800;
      background: #e0f2fe;
      padding: 2px 6px;
      border-radius: 4px;
    }

    .verb-stem {
      color: #1e2945;
      font-weight: 700;
    }

    .verb-orange-tag {
      color: #ffffff;
      background: #ea580c;
      font-weight: 800;
      padding: 2px 7px;
      border-radius: 4px;
      box-shadow: 0 0 8px rgba(234, 88, 12, 0.45);
      display: inline-block;
      margin-left: 1px;
    }

    /* Interactive Try-It Bar */
    .interactive-zone {
      margin-top: 12px;
      background: #f8fafc;
      border: 1px solid #e6e6e6;
      border-radius: 12px;
      padding: 12px;
      text-align: center;
    }

    .subject-buttons {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 6px;
      margin-bottom: 10px;
    }

    .subj-btn {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      color: #1e2945;
      padding: 5px 10px;
      font-size: 13px;
      font-weight: 600;
      border-radius: 6px;
      cursor: pointer;
      outline: none;
      transition: background 0.15s, border-color 0.15s;
    }

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

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

    .live-sentence {
      font-size: 17px;
      font-weight: 600;
      color: #1e2945;
      min-height: 28px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }
  </style>
</head>
<body>

  <div class="grid-wrap">
    
    <div class="column-card">
      <div class="header-pill blue-header">
        <span>👥 Many People or I / You</span>
      </div>
      <div class="rule-box">Base Verb (No Ending)</div>
      <div class="example-list">
        <div class="example-item">
          <span>I</span>
          <span class="verb-blue">kick</span>
          <span>the ball.</span>
        </div>
        <div class="example-item">
          <span>They</span>
          <span class="verb-blue">kick</span>
          <span>the ball.</span>
        </div>
      </div>
    </div>

    
    <div class="column-card">
      <div class="header-pill orange-header">
        <span>👤 He / She / One Thing</span>
      </div>
      <div class="rule-box">Add <span style="color:#c2410c; font-weight:800;">-s</span></div>
      <div class="example-list">
        <div class="example-item">
          <span>She</span>
          <span class="verb-stem">kick</span><span class="verb-orange-tag">-s</span>
          <span>the ball.</span>
        </div>
        <div class="example-item">
          <span>The cat</span>
          <span class="verb-stem">kick</span><span class="verb-orange-tag">-s</span>
          <span>the ball.</span>
        </div>
      </div>
    </div>
  </div>

  
  <div class="interactive-zone">
    <div class="subject-buttons">
      <button class="subj-btn active-blue" onclick="setSubject('I', false, this)">I</button>
      <button class="subj-btn" onclick="setSubject('She', true, this)">She</button>
      <button class="subj-btn" onclick="setSubject('They', false, this)">They</button>
      <button class="subj-btn" onclick="setSubject('The cat', true, this)">The cat</button>
      <button class="subj-btn" onclick="setSubject('You', false, this)">You</button>
    </div>

    <div class="live-sentence" id="sentenceOutput">
      <span>I</span>
      <span class="verb-blue">kick</span>
      <span>the ball.</span>
    </div>
  </div>

  <script>
    function setSubject(subject, hasS, btn) {
      document.querySelectorAll('.subj-btn').forEach(b => {
        b.className = 'subj-btn';
      });

      if (hasS) {
        btn.classList.add('active-orange');
        document.getElementById('sentenceOutput').innerHTML = `
          <span>${subject}</span>
          <span class="verb-stem">kick</span><span class="verb-orange-tag">-s</span>
          <span>the ball.</span>
        `;
      } else {
        btn.classList.add('active-blue');
        document.getElementById('sentenceOutput').innerHTML = `
          <span>${subject}</span>
          <span class="verb-blue">kick</span>
          <span>the ball.</span>
        `;
      }
    }
  </script>
</body>
</html>

OGE.4.L.2

Aligned learning resources

Related diagrams