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

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      padding: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      min-height: 100%;
    }

    /* Interactive filter tabs */
    .toggle-bar {
      display: flex;
      gap: 6px;
      margin-bottom: 10px;
      background: #e2e8f0;
      padding: 4px;
      border-radius: 24px;
    }

    .tab-btn {
      border: none;
      background: transparent;
      padding: 6px 14px;
      font-size: 14px;
      font-weight: 700;
      color: #64748b;
      border-radius: 20px;
      cursor: pointer;
      transition: all 0.25s ease;
      box-shadow: none;
    }

    .tab-btn.active {
      background: #ffffff;
      color: #0f172a;
      box-shadow: 0 2px 6px rgba(0,0,0,0.1);
    }

    /* Main comparison container */
    .comparison-grid {
      display: flex;
      gap: 10px;
      width: 100%;
      max-width: 600px;
      height: 380px;
    }

    .soil-column {
      flex: 1;
      display: flex;
      flex-direction: column;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 4px 12px rgba(0,0,0,0.06);
      transition: flex 0.3s ease, opacity 0.3s ease;
    }

    .soil-column.hidden {
      display: none;
    }

    /* Header banner */
    .column-header {
      padding: 8px 6px;
      text-align: center;
      font-size: 15px;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
    }

    .healthy-head {
      background: #22c55e;
      color: #ffffff;
    }

    .sick-head {
      background: #94a3b8;
      color: #ffffff;
    }

    /* Above ground sky section */
    .sky-section {
      height: 120px;
      position: relative;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-end;
      padding-bottom: 4px;
    }

    .healthy-sky {
      background: linear-gradient(180deg, #bae6fd 0%, #e0f2fe 100%);
    }

    .sick-sky {
      background: linear-gradient(180deg, #fed7aa 0%, #ffedd5 100%);
    }

    .badge {
      position: absolute;
      top: 8px;
      font-size: 11px;
      font-weight: 800;
      padding: 3px 8px;
      border-radius: 12px;
      text-transform: uppercase;
      letter-spacing: 0.3px;
    }

    .healthy-badge {
      background: #ffffff;
      color: #15803d;
      border: 1px solid #86efac;
    }

    .sick-badge {
      background: #ffffff;
      color: #b45309;
      border: 1px solid #fdba74;
    }

    .plant-above {
      font-size: 42px;
      line-height: 1;
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
    }

    .wilting {
      transform: rotate(28deg) translateY(6px);
      filter: grayscale(0.5) drop-shadow(0 2px 4px rgba(0,0,0,0.1));
      opacity: 0.85;
    }

    /* Soil section */
    .soil-section {
      flex: 1;
      position: relative;
      padding: 10px 8px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      overflow: hidden;
    }

    .healthy-soil {
      background: linear-gradient(180deg, #4a2810 0%, #2f1807 100%);
      border-top: 4px solid #15803d;
    }

    .sick-soil {
      background: linear-gradient(180deg, #9c8e80 0%, #786d63 100%);
      border-top: 4px solid #d97706;
    }

    /* Cross-section Elements */
    .soil-svg {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }

    .element-row {
      display: flex;
      justify-content: space-around;
      align-items: center;
      z-index: 1;
      position: relative;
    }

    .worm {
      font-size: 26px;
      display: inline-block;
      animation: wiggle 3s ease-in-out infinite;
      transform-origin: center;
    }

    @keyframes wiggle {
      0%, 100% { transform: rotate(-5deg) scaleX(1); }
      50% { transform: rotate(8deg) scaleX(1.08); }
    }

    .water-drop {
      font-size: 20px;
      display: inline-block;
      animation: drip 2.5s ease-in-out infinite alternate;
    }

    @keyframes drip {
      0% { transform: translateY(-3px); opacity: 0.9; }
      100% { transform: translateY(4px); opacity: 0.6; }
    }

    .trash-item {
      font-size: 22px;
      filter: drop-shadow(0 2px 2px rgba(0,0,0,0.3));
    }

    .trash-rotated {
      transform: rotate(-25deg);
    }

    .soil-label {
      font-size: 12px;
      font-weight: 700;
      text-align: center;
      padding: 4px 8px;
      border-radius: 8px;
      z-index: 1;
    }

    .healthy-label-bg {
      background: rgba(255, 255, 255, 0.2);
      color: #86efac;
    }

    .sick-label-bg {
      background: rgba(0, 0, 0, 0.25);
      color: #fed7aa;
    }
  </style>
</head>
<body>

  
  <div class="toggle-bar">
    <button class="tab-btn active" id="btnBoth" onclick="showView('both')">Compare</button>
    <button class="tab-btn" id="btnHealthy" onclick="showView('healthy')">🌱 Healthy</button>
    <button class="tab-btn" id="btnSick" onclick="showView('sick')">🥀 Dry</button>
  </div>

  
  <div class="comparison-grid">
    
    
    <div class="soil-column" id="colHealthy">
      <div class="column-header healthy-head">
        <span>✓ Healthy Soil</span>
      </div>

      <div class="sky-section healthy-sky">
        <span class="badge healthy-badge">Grows our food!</span>
        <div class="plant-above">🥕</div>
      </div>

      <div class="soil-section healthy-soil">
        
        <svg class="soil-svg" viewBox="0 0 160 200" preserveAspectRatio="none">
          
          <polygon points="76,0 84,0 81,75 79,75" fill="#f97316" />
          <path d="M80,30 Q50,60 30,110 M80,50 Q110,80 130,130 M80,75 Q65,120 70,170 M80,75 Q95,120 100,165 M50,85 Q30,120 20,150" 
                stroke="#fed7aa" stroke-width="2.5" fill="none" stroke-linecap="round" opacity="0.85"/>
        </svg>

        <div class="element-row">
          <span class="water-drop" title="Water">💧</span>
          <span class="water-drop" style="animation-delay: 1.2s;" title="Water">💧</span>
        </div>

        <div class="element-row">
          <span class="worm" title="Happy Earthworm">🪱</span>
          <span class="water-drop" style="animation-delay: 0.6s;" title="Water">💧</span>
        </div>

        <div class="soil-label healthy-label-bg">
          Rich &amp; Moist
        </div>
      </div>
    </div>

    
    <div class="soil-column" id="colSick">
      <div class="column-header sick-head">
        <span>⚠ Dry &amp; Littered</span>
      </div>

      <div class="sky-section sick-sky">
        <span class="badge sick-badge">Needs protection!</span>
        <div class="plant-above wilting">🥀</div>
      </div>

      <div class="soil-section sick-soil">
        
        <svg class="soil-svg" viewBox="0 0 160 200" preserveAspectRatio="none">
          
          <path d="M20,0 L35,35 L25,60 L40,85 M120,0 L110,40 L130,75 L115,110 M75,0 L85,25 L65,55" 
                stroke="#52483e" stroke-width="2" fill="none" opacity="0.6"/>
          
          <path d="M80,0 Q85,25 90,40 M78,0 Q70,20 65,35" 
                stroke="#d6d3d1" stroke-width="2" fill="none" stroke-linecap="round" opacity="0.5"/>
        </svg>

        <div class="element-row">
          <span class="trash-item trash-rotated" title="Can">🥫</span>
          <span class="trash-item" title="Trash">🗑️</span>
        </div>

        <div class="element-row">
          <span class="trash-item" title="Plastic">🥤</span>
        </div>

        <div class="soil-label sick-label-bg">
          Dry &amp; No Worms
        </div>
      </div>
    </div>

  </div>

  <script>
    function showView(view) {
      const colHealthy = document.getElementById('colHealthy');
      const colSick = document.getElementById('colSick');
      const btnBoth = document.getElementById('btnBoth');
      const btnHealthy = document.getElementById('btnHealthy');
      const btnSick = document.getElementById('btnSick');

      btnBoth.classList.remove('active');
      btnHealthy.classList.remove('active');
      btnSick.classList.remove('active');

      if (view === 'healthy') {
        colHealthy.classList.remove('hidden');
        colSick.classList.add('hidden');
        btnHealthy.classList.add('active');
      } else if (view === 'sick') {
        colHealthy.classList.add('hidden');
        colSick.classList.remove('hidden');
        btnSick.classList.add('active');
      } else {
        colHealthy.classList.remove('hidden');
        colSick.classList.remove('hidden');
        btnBoth.classList.add('active');
      }
    }
  </script>
</body>
</html>

Saving Water and Taking Care of Earth's Resources

<!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;
      user-select: none;
      -webkit-user-select: none;
    }

    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #f8fafc;
      color: #1e293b;
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      min-height: 100%;
    }

    /* Header & Star Counter */
    .header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      padding: 8px 14px;
      border-radius: 12px;
      border: 1px solid #e2e8f0;
    }

    .title {
      font-size: 15px;
      font-weight: 800;
      color: #0284c7;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .star-counter {
      display: flex;
      align-items: center;
      gap: 4px;
      font-size: 14px;
      font-weight: 700;
      color: #d97706;
      background: #fef3c7;
      padding: 4px 10px;
      border-radius: 20px;
      border: 1px solid #fde68a;
    }

    .star-icon {
      font-size: 16px;
      display: inline-block;
      transition: transform 0.3s ease;
    }

    .star-counter.celebrate .star-icon {
      transform: scale(1.3);
    }

    /* Action Cards Grid */
    .cards-container {
      display: flex;
      flex-direction: column;
      gap: 10px;
      flex: 1;
    }

    .action-card {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 14px;
      padding: 10px 12px;
      display: grid;
      grid-template-columns: 56px 1fr 34px;
      align-items: center;
      gap: 12px;
      cursor: pointer;
      transition: background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
      -webkit-tap-highlight-color: transparent;
    }

    .action-card:active {
      background: #f1f5f9;
    }

    .action-card.done {
      border-color: #22c55e;
      background: #f0fdf4;
    }

    /* Visual illustration box */
    .card-visual {
      width: 56px;
      height: 56px;
      background: #f8fafc;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
      position: relative;
      border: 1px solid #e2e8f0;
    }

    .action-card.done .card-visual {
      background: #dcfce7;
      border-color: #bbf7d0;
    }

    /* Visual mini-animations */
    .drip-effect {
      position: absolute;
      bottom: 6px;
      font-size: 12px;
      transition: opacity 0.3s ease, transform 0.3s ease;
    }

    .action-card.done .drip-effect {
      opacity: 0;
      transform: translateY(4px);
    }

    .card-text {
      display: flex;
      flex-direction: column;
      gap: 2px;
    }

    .card-label {
      font-size: 15px;
      font-weight: 700;
      color: #0f172a;
      line-height: 1.2;
    }

    .card-subtext {
      font-size: 12px;
      font-weight: 500;
      color: #64748b;
      line-height: 1.2;
    }

    .action-card.done .card-subtext {
      color: #15803d;
    }

    /* Checkbox Badge */
    .checkbox {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      border: 2px solid #cbd5e1;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
      font-weight: 900;
      color: transparent;
      transition: all 0.25s ease;
      background: #ffffff;
    }

    .action-card.done .checkbox {
      background: #22c55e;
      border-color: #22c55e;
      color: #ffffff;
    }

    /* Bottom Prompt */
    .prompt {
      text-align: center;
      font-size: 12px;
      font-weight: 600;
      color: #64748b;
      padding: 2px 0;
    }
  </style>
</head>
<body>

  
  <div class="header">
    <div class="title">
      <span>🌍</span> Earth Hero
    </div>
    <div class="star-counter" id="starCounter">
      <span class="star-icon">⭐</span>
      <span id="starText">0/3 Stars</span>
    </div>
  </div>

  
  <div class="cards-container">

    
    <div class="action-card" id="card1" onclick="toggleCard(1)">
      <div class="card-visual">
        <span id="tapIcon">🚰</span>
        <span class="drip-effect" id="drip">💧</span>
      </div>
      <div class="card-text">
        <div class="card-label">Turn Off the Tap</div>
        <div class="card-subtext" id="sub1">Save water while brushing!</div>
      </div>
      <div class="checkbox" id="check1">✓</div>
    </div>

    
    <div class="action-card" id="card2" onclick="toggleCard(2)">
      <div class="card-visual">
        <span id="binIcon">🗑️</span>
      </div>
      <div class="card-text">
        <div class="card-label">Trash in the Bin</div>
        <div class="card-subtext" id="sub2">Keep soil and grass clean!</div>
      </div>
      <div class="checkbox" id="check2">✓</div>
    </div>

    
    <div class="action-card" id="card3" onclick="toggleCard(3)">
      <div class="card-visual">
        <span id="plantIcon">🌱</span>
      </div>
      <div class="card-text">
        <div class="card-label">Water a Plant</div>
        <div class="card-subtext" id="sub3">Use leftover cup water!</div>
      </div>
      <div class="checkbox" id="check3">✓</div>
    </div>

  </div>

  <div class="prompt" id="promptText">Tap each action to complete! 👆</div>

  <script>
    const states = { 1: false, 2: false, 3: false };

    // Tone synthesis on user tap
    function playChime(success) {
      try {
        const ctx = new (window.AudioContext || window.webkitAudioContext)();
        const osc = ctx.createOscillator();
        const gain = ctx.createGain();
        osc.type = 'sine';
        osc.frequency.setValueAtTime(success ? 587.33 : 440, ctx.currentTime); // D5 or A4
        if (success) {
          osc.frequency.exponentialRampToValueAtTime(880, ctx.currentTime + 0.15); // Ramp to A5
        }
        gain.setValueAtTime(0.15, ctx.currentTime);
        gain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + 0.25);
        osc.connect(gain);
        gain.connect(ctx.destination);
        osc.start();
        osc.stop(ctx.currentTime + 0.25);
      } catch (e) {
        // Audio unavailable or blocked
      }
    }

    function toggleCard(id) {
      states[id] = !states[id];
      const isDone = states[id];

      const card = document.getElementById('card' + id);
      const sub = document.getElementById('sub' + id);
      card.classList.toggle('done', isDone);

      // Card-specific visual transforms
      if (id === 1) {
        document.getElementById('tapIcon').textContent = isDone ? '✨' : '🚰';
        sub.textContent = isDone ? 'Tap closed! Water saved.' : 'Save water while brushing!';
      } else if (id === 2) {
        document.getElementById('binIcon').textContent = isDone ? '🌿' : '🗑️';
        sub.textContent = isDone ? 'Park & soil stay clean!' : 'Keep soil and grass clean!';
      } else if (id === 3) {
        document.getElementById('plantIcon').textContent = isDone ? '🌸' : '🌱';
        sub.textContent = isDone ? 'Flower is blooming happily!' : 'Use leftover cup water!';
      }

      playChime(isDone);
      updateStars();
    }

    function updateStars() {
      const count = Object.values(states).filter(Boolean).length;
      const starText = document.getElementById('starText');
      const counterBox = document.getElementById('starCounter');
      const prompt = document.getElementById('promptText');

      starText.textContent = count + '/3 Stars';

      if (count === 3) {
        counterBox.classList.add('celebrate');
        prompt.textContent = '🌟 Awesome! You are an Earth Hero! 🌟';
        prompt.style.color = '#15803d';
      } else {
        counterBox.classList.remove('celebrate');
        prompt.textContent = 'Tap each action to complete! 👆';
        prompt.style.color = '#64748b';
      }
    }
  </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="1:1">
  <title>Earth's Natural Resources</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: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 12px;
      min-height: 100%;
      user-select: none;
    }

    .header {
      text-align: center;
      margin-bottom: 8px;
    }

    .title {
      font-size: 18px;
      font-weight: 800;
      color: #1e2945;
    }

    .subtitle {
      font-size: 13px;
      color: #64748b;
      font-weight: 500;
    }

    .diagram-area {
      position: relative;
      width: 100%;
      max-width: 380px;
      aspect-ratio: 1 / 1;
      display: grid;
      grid-template-columns: 1fr 1fr;
      grid-template-rows: 1fr 1fr;
      gap: 12px;
      margin: auto 0;
    }

    .center-earth-wrapper {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      z-index: 10;
      pointer-events: none;
    }

    .earth {
      width: 86px;
      height: 86px;
      border-radius: 50%;
      background: #38bdf8;
      position: relative;
      box-shadow: 0 4px 16px rgba(56, 189, 248, 0.35), inset -6px -6px 0 rgba(14, 116, 144, 0.2);
      display: flex;
      align-items: center;
      justify-content: center;
      transition: transform 0.3s ease;
      overflow: hidden;
    }

    /* Continents */
    .land-1 {
      position: absolute;
      top: 14px;
      left: 10px;
      width: 32px;
      height: 24px;
      background: #4ade80;
      border-radius: 50% 40% 60% 30%;
    }

    .land-2 {
      position: absolute;
      bottom: 12px;
      right: 12px;
      width: 36px;
      height: 28px;
      background: #4ade80;
      border-radius: 40% 60% 30% 50%;
    }

    /* Friendly Face */
    .face {
      position: relative;
      z-index: 2;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 3px;
      margin-top: 4px;
    }

    .eyes {
      display: flex;
      gap: 16px;
    }

    .eye {
      width: 6px;
      height: 6px;
      background: #0f172a;
      border-radius: 50%;
    }

    .cheeks {
      position: absolute;
      top: 5px;
      display: flex;
      gap: 24px;
    }

    .cheek {
      width: 6px;
      height: 4px;
      background: #f472b6;
      border-radius: 50%;
      opacity: 0.8;
    }

    .smile {
      width: 12px;
      height: 6px;
      border-bottom: 2.5px solid #0f172a;
      border-radius: 0 0 12px 12px;
    }

    /* Resource Cards */
    .resource-card {
      background: #ffffff;
      border-radius: 16px;
      padding: 10px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
      cursor: pointer;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
      border: 2px solid transparent;
      transition: all 0.25s ease;
      position: relative;
    }

    .resource-card:focus {
      outline: none;
    }

    .resource-card.water {
      align-items: flex-start;
      padding-left: 14px;
    }

    .resource-card.sun {
      align-items: flex-end;
      padding-right: 14px;
    }

    .resource-card.soil {
      align-items: flex-start;
      padding-left: 14px;
    }

    .resource-card.air {
      align-items: flex-end;
      padding-right: 14px;
    }

    .icon-box {
      font-size: 26px;
      line-height: 1;
      margin-bottom: 4px;
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.08));
    }

    .card-label {
      font-size: 13px;
      font-weight: 700;
      color: #1e2945;
    }

    /* Active Highlight States */
    .resource-card.active.water {
      border-color: #38bdf8;
      background: #f0f9ff;
      box-shadow: 0 4px 14px rgba(56, 189, 248, 0.25);
    }

    .resource-card.active.sun {
      border-color: #fbbf24;
      background: #fffbeb;
      box-shadow: 0 4px 14px rgba(251, 191, 36, 0.25);
    }

    .resource-card.active.soil {
      border-color: #4ade80;
      background: #f0fdf4;
      box-shadow: 0 4px 14px rgba(74, 222, 128, 0.25);
    }

    .resource-card.active.air {
      border-color: #a78bfa;
      background: #f5f3ff;
      box-shadow: 0 4px 14px rgba(167, 139, 250, 0.25);
    }

    /* Info Bar at Bottom */
    .info-panel {
      width: 100%;
      max-width: 380px;
      background: #ffffff;
      border-radius: 14px;
      padding: 10px 14px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.05);
      border: 1px solid #e2e8f0;
      min-height: 56px;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      margin-top: 8px;
    }

    .info-text {
      font-size: 13px;
      font-weight: 600;
      line-height: 1.35;
      color: #1e2945;
      transition: opacity 0.2s ease;
    }

    /* Navigation dots */
    .nav-row {
      display: flex;
      gap: 8px;
      margin-top: 6px;
    }

    .dot-btn {
      width: 28px;
      height: 8px;
      border-radius: 4px;
      background: #cbd5e1;
      border: none;
      cursor: pointer;
      transition: all 0.25s ease;
      padding: 0;
    }

    .dot-btn.active {
      background: #0284c7;
      width: 36px;
    }
  </style>
</head>
<body>

  <div class="header">
    <div class="title">Earth's Natural Resources</div>
    <div class="subtitle">Tap each card to explore!</div>
  </div>

  <div class="diagram-area">
    
    <button class="resource-card water active" id="card-0" onclick="selectResource(0)">
      <div class="icon-box">💧</div>
      <div class="card-label">Clean<br>Water</div>
    </button>

    
    <button class="resource-card sun" id="card-1" onclick="selectResource(1)">
      <div class="icon-box">☀️</div>
      <div class="card-label">Warm<br>Sunlight</div>
    </button>

    
    <button class="resource-card soil" id="card-2" onclick="selectResource(2)">
      <div class="icon-box">🌱</div>
      <div class="card-label">Healthy<br>Soil</div>
    </button>

    
    <button class="resource-card air" id="card-3" onclick="selectResource(3)">
      <div class="icon-box">💨</div>
      <div class="card-label">Fresh<br>Air</div>
    </button>

    
    <div class="center-earth-wrapper">
      <div class="earth" id="earthElem">
        <div class="land-1"></div>
        <div class="land-2"></div>
        <div class="cheeks">
          <div class="cheek"></div>
          <div class="cheek"></div>
        </div>
        <div class="face">
          <div class="eyes">
            <div class="eye"></div>
            <div class="eye"></div>
          </div>
          <div class="smile"></div>
        </div>
      </div>
    </div>
  </div>

  
  <div class="info-panel">
    <p class="info-text" id="infoText">Plants, animals, and you need water to drink and live!</p>
  </div>

  
  <div class="nav-row">
    <button class="dot-btn active" id="dot-0" onclick="selectResource(0)" aria-label="Water"></button>
    <button class="dot-btn" id="dot-1" onclick="selectResource(1)" aria-label="Sunlight"></button>
    <button class="dot-btn" id="dot-2" onclick="selectResource(2)" aria-label="Soil"></button>
    <button class="dot-btn" id="dot-3" onclick="selectResource(3)" aria-label="Air"></button>
  </div>

  <script>
    const resources = [
      {
        name: "Clean Water",
        fact: "Plants, animals, and you need clean water to drink and grow! 💧",
        scale: "scale(1.04)"
      },
      {
        name: "Warm Sunlight",
        fact: "Sunlight warms our world and helps green plants make food! ☀️",
        scale: "scale(1.04)"
      },
      {
        name: "Healthy Soil",
        fact: "Rich soil gives plants a cozy place to spread their roots! 🌱",
        scale: "scale(1.04)"
      },
      {
        name: "Fresh Air",
        fact: "Every living creature breathes fresh air to stay alive! 💨",
        scale: "scale(1.04)"
      }
    ];

    let currentIndex = 0;
    const cards = [
      document.getElementById('card-0'),
      document.getElementById('card-1'),
      document.getElementById('card-2'),
      document.getElementById('card-3')
    ];
    const dots = [
      document.getElementById('dot-0'),
      document.getElementById('dot-1'),
      document.getElementById('dot-2'),
      document.getElementById('dot-3')
    ];
    const infoText = document.getElementById('infoText');
    const earthElem = document.getElementById('earthElem');

    function selectResource(index) {
      currentIndex = index;
      
      cards.forEach((card, i) => {
        if (i === index) {
          card.classList.add('active');
        } else {
          card.classList.remove('active');
        }
      });

      dots.forEach((dot, i) => {
        if (i === index) {
          dot.classList.add('active');
        } else {
          dot.classList.remove('active');
        }
      });

      infoText.style.opacity = '0';
      setTimeout(() => {
        infoText.textContent = resources[index].fact;
        infoText.style.opacity = '1';
      }, 150);

      // Subtle pulse on Earth
      earthElem.style.transform = 'scale(1.08)';
      setTimeout(() => {
        earthElem.style.transform = 'scale(1)';
      }, 250);
    }
  </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>Earth's Water Comparison</title>
  <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;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 14px 8px;
      min-height: 100%;
      user-select: none;
      overflow-x: hidden;
    }

    .title {
      font-size: 17px;
      font-weight: 800;
      color: #1e2945;
      margin-bottom: 20px;
      text-align: center;
      letter-spacing: -0.2px;
    }

    .comparison-container {
      display: flex;
      align-items: flex-end;
      justify-content: center;
      gap: 14px;
      width: 100%;
      max-width: 440px;
      position: relative;
    }

    /* Left: Ocean Bucket */
    .bucket-card {
      flex: 1.25;
      display: flex;
      flex-direction: column;
      align-items: center;
      min-width: 0;
    }

    .bucket-wrapper {
      position: relative;
      width: 100%;
      max-width: 175px;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding-top: 14px;
    }

    .bucket-handle {
      position: absolute;
      top: 0;
      left: 14px;
      right: 14px;
      height: 24px;
      border: 3.5px solid #94a3b8;
      border-bottom: none;
      border-radius: 16px 16px 0 0;
      z-index: 1;
    }

    .bucket {
      width: 100%;
      height: 160px;
      background: linear-gradient(180deg, #bae6fd 0%, #38bdf8 100%);
      border: 3.5px solid #0284c7;
      border-radius: 8px 8px 24px 24px;
      padding: 8px 6px;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      position: relative;
      box-shadow: inset 0 -6px 0 rgba(2, 132, 199, 0.25);
      z-index: 2;
    }

    .bucket-rim {
      position: absolute;
      top: -7px;
      left: -5px;
      right: -5px;
      height: 12px;
      background: #0284c7;
      border-radius: 6px;
    }

    .drops-grid {
      display: grid;
      grid-template-columns: repeat(10, 1fr);
      gap: 2px;
      width: 100%;
      background: rgba(255, 255, 255, 0.6);
      padding: 5px 4px;
      border-radius: 8px;
      z-index: 2;
    }

    .drop {
      width: 100%;
      aspect-ratio: 1;
      background: #0369a1;
      border-radius: 50% 50% 50% 0;
      transform: rotate(-45deg);
    }

    /* Right: Fresh Water Cup */
    .cup-card {
      flex: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
      min-width: 0;
    }

    /* Badge & Pointer */
    .badge-arrow {
      margin-bottom: 6px;
      display: flex;
      flex-direction: column;
      align-items: center;
      animation: gentleFloat 3s infinite ease-in-out;
      z-index: 3;
    }

    .badge {
      background: #fef08a;
      border: 1.5px solid #ca8a04;
      color: #854d0e;
      font-size: 10.5px;
      font-weight: 800;
      padding: 3px 6px;
      border-radius: 20px;
      white-space: nowrap;
      box-shadow: 0 2px 4px rgba(202, 138, 4, 0.15);
      text-align: center;
    }

    .pointer {
      color: #ca8a04;
      font-size: 11px;
      line-height: 8px;
      margin-top: 1px;
    }

    .cup-wrapper {
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .cup {
      width: 80px;
      height: 74px;
      background: linear-gradient(180deg, #ecfdf5 0%, #a7f3d0 100%);
      border: 3px solid #059669;
      border-radius: 4px 4px 18px 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 5px;
      position: relative;
      box-shadow: 0 4px 10px rgba(5, 150, 105, 0.12);
    }

    .cup-rim {
      position: absolute;
      top: -5px;
      left: -4px;
      right: -4px;
      height: 8px;
      background: #059669;
      border-radius: 4px;
    }

    .sparkle {
      position: absolute;
      font-size: 13px;
      animation: gentleGlow 2.5s infinite ease-in-out;
      pointer-events: none;
    }

    .sparkle-tl { top: -12px; left: -10px; animation-delay: 0s; }
    .sparkle-tr { top: -10px; right: -10px; animation-delay: 1.25s; }

    .fresh-drop {
      width: 14px;
      height: 14px;
      background: #0284c7;
      border-radius: 50% 50% 50% 0;
      transform: rotate(-45deg);
      box-shadow: 0 2px 3px rgba(0, 0, 0, 0.12);
    }

    /* Labels */
    .label-group {
      margin-top: 10px;
      text-align: center;
      width: 100%;
    }

    .count-badge {
      display: inline-block;
      font-size: 13px;
      font-weight: 800;
      padding: 3px 9px;
      border-radius: 12px;
      margin-bottom: 4px;
    }

    .count-ocean {
      background: #e0f2fe;
      color: #0369a1;
      border: 1.5px solid #7dd3fc;
    }

    .count-fresh {
      background: #dcfce7;
      color: #15803d;
      border: 1.5px solid #86efac;
    }

    .sub-label {
      font-size: 12px;
      font-weight: 800;
      line-height: 1.25;
      color: #1e2945;
    }

    .sub-desc {
      font-size: 10.5px;
      color: #64748b;
      font-weight: 600;
      margin-top: 2px;
      line-height: 1.2;
    }

    /* Smooth Gentle Animations (min 500ms states, flicker-free) */
    @keyframes gentleGlow {
      0%, 100% { transform: scale(0.9); opacity: 0.6; }
      50% { transform: scale(1.15); opacity: 1; }
    }

    @keyframes gentleFloat {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-4px); }
    }

    @media (max-width: 360px) {
      .comparison-container {
        gap: 8px;
      }
      .title {
        font-size: 15px;
        margin-bottom: 14px;
      }
      .badge {
        font-size: 9.5px;
        padding: 2px 5px;
      }
      .bucket {
        height: 145px;
      }
      .cup {
        width: 72px;
        height: 68px;
      }
      .fresh-drop {
        width: 12px;
        height: 12px;
      }
      .sub-label {
        font-size: 11px;
      }
      .sub-desc {
        font-size: 9.5px;
      }
    }
  </style>
</head>
<body>

  <div class="title">Earth's Water Out of 100 Drops</div>

  <div class="comparison-container">
    
    
    <div class="bucket-card">
      <div class="bucket-wrapper">
        <div class="bucket-handle"></div>
        <div class="bucket">
          <div class="bucket-rim"></div>
          <div class="drops-grid" id="oceanGrid"></div>
        </div>
      </div>
      <div class="label-group">
        <span class="count-badge count-ocean">97 Drops</span>
        <div class="sub-label">Salty Ocean Water</div>
        <div class="sub-desc">(Too salty to drink!)</div>
      </div>
    </div>

    
    <div class="cup-card">
      <div class="badge-arrow">
        <div class="badge">★ Super Rare & Precious!</div>
        <div class="pointer">▼</div>
      </div>
      <div class="cup-wrapper">
        <div class="cup">
          <div class="cup-rim"></div>
          <div class="sparkle sparkle-tl">✨</div>
          <div class="sparkle sparkle-tr">✨</div>
          <div class="fresh-drop"></div>
          <div class="fresh-drop"></div>
          <div class="fresh-drop"></div>
        </div>
      </div>
      <div class="label-group">
        <span class="count-badge count-fresh">3 Drops</span>
        <div class="sub-label">Fresh Water</div>
        <div class="sub-desc">(For drinking & plants)</div>
      </div>
    </div>

  </div>

  <script>
    // Render exactly 97 droplets in the ocean grid
    const grid = document.getElementById('oceanGrid');
    for (let i = 0; i < 97; i++) {
      const drop = document.createElement('div');
      drop.className = 'drop';
      grid.appendChild(drop);
    }
  </script>
</body>
</html>

OGS.1.ESS.4

Aligned learning resources

Related diagrams