<!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>Weathering: Rocks to Soil</title>
  <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;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 12px;
      gap: 10px;
    }

    .scene-container {
      position: relative;
      width: 100%;
      max-width: 540px;
      aspect-ratio: 16 / 10;
      background: linear-gradient(180deg, #e0f2fe 0%, #f0fdf4 70%, #dcfce7 100%);
      border-radius: 16px;
      overflow: hidden;
      box-shadow: inset 0 0 0 1px rgba(0,0,0,0.06);
    }

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

    /* Labels */
    .tag {
      font-size: 13px;
      font-weight: 700;
      fill: #1e2945;
      pointer-events: none;
    }

    .tag-bg {
      fill: rgba(255, 255, 255, 0.92);
      stroke: #cbd5e1;
      stroke-width: 1;
      rx: 6;
    }

    /* Particle crumbs */
    .crumb {
      transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1), opacity 0.6s ease;
    }

    /* River flow animation */
    @keyframes waveMove {
      0% { transform: translateX(0); }
      100% { transform: translateX(-30px); }
    }
    .river-wave {
      animation: waveMove 2.5s linear infinite;
    }

    /* Wind gust animation */
    .wind-gust {
      stroke-dasharray: 60;
      stroke-dashoffset: 60;
      transition: stroke-dashoffset 0.5s ease-out;
    }
    .wind-active {
      animation: windBlow 0.7s ease-out forwards;
    }
    @keyframes windBlow {
      0% { stroke-dashoffset: 60; opacity: 0; }
      30% { opacity: 1; }
      100% { stroke-dashoffset: -60; opacity: 0; }
    }

    /* Water splash animation */
    .splash-drop {
      opacity: 0;
      transform-origin: center;
    }
    .splash-active {
      animation: splashArc 0.6s ease-out forwards;
    }
    @keyframes splashArc {
      0% { opacity: 0; transform: translate(0, 0) scale(0.6); }
      40% { opacity: 1; transform: translate(15px, -18px) scale(1.2); }
      100% { opacity: 0; transform: translate(30px, 6px) scale(0.4); }
    }

    /* Boulder transition */
    #boulder {
      transition: d 0.5s cubic-bezier(0.34, 1.56, 0.64, 1), fill 0.3s ease;
      transform-origin: 320px 220px;
    }

    /* Soil/Sand Mound transition */
    #sandSoilPile {
      transition: d 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    }

    /* Controls */
    .controls {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      width: 100%;
      max-width: 540px;
      flex-wrap: wrap;
    }

    .btn-action {
      background: #0284c7;
      color: #ffffff;
      border: none;
      border-radius: 9999px;
      padding: 12px 22px;
      font-size: 15px;
      font-weight: 700;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 3px 8px rgba(2, 132, 199, 0.35);
      transition: background-color 0.2s, box-shadow 0.2s;
    }

    .btn-action:active {
      background: #0369a1;
      box-shadow: 0 1px 3px rgba(2, 132, 199, 0.4);
    }

    .btn-reset {
      background: #f1f5f9;
      color: #475569;
      border: 1px solid #cbd5e1;
      border-radius: 9999px;
      padding: 10px 16px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      transition: background-color 0.2s;
    }

    .btn-reset:active {
      background: #e2e8f0;
    }
  </style>
</head>
<body>

  <div class="scene-container">
    <svg viewBox="0 0 500 320">
      <defs>
        
        <linearGradient id="riverGrad" x1="0" y1="0" x2="1" y2="1">
          <stop offset="0%" stop-color="#38bdf8" />
          <stop offset="100%" stop-color="#0284c7" />
        </linearGradient>
        
        <linearGradient id="boulderGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#94a3b8" />
          <stop offset="60%" stop-color="#64748b" />
          <stop offset="100%" stop-color="#475569" />
        </linearGradient>

        <linearGradient id="sandSoilGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#fde047" />
          <stop offset="45%" stop-color="#ca8a04" />
          <stop offset="100%" stop-color="#78350f" />
        </linearGradient>

        <filter id="softGlow" x="-10%" y="-10%" width="120%" height="120%">
          <feDropShadow dx="0" dy="2" stdDeviation="2" flood-opacity="0.1" />
        </filter>
      </defs>

      
      <path d="M 0 240 Q 250 225 500 240 L 500 320 L 0 320 Z" fill="#86efac" />
      <path d="M 0 255 Q 250 245 500 255 L 500 320 L 0 320 Z" fill="#4ade80" />

      
      <path d="M -20 200 C 40 200 70 230 110 245 C 130 252 140 270 140 320 L -20 320 Z" fill="url(#riverGrad)" />
      
      
      <g class="river-wave">
        <path d="M 0 230 Q 30 220 60 230 T 120 230" fill="none" stroke="#bae6fd" stroke-width="3" stroke-linecap="round" opacity="0.8" />
        <path d="M -10 260 Q 20 250 50 260 T 110 260" fill="none" stroke="#e0f2fe" stroke-width="3.5" stroke-linecap="round" opacity="0.8" />
        <path d="M 10 285 Q 40 280 70 285 T 130 285" fill="none" stroke="#ffffff" stroke-width="2.5" stroke-linecap="round" opacity="0.7" />
      </g>

      
      <g id="windGroup">
        <path class="wind-gust" id="wind1" d="M 40 120 C 100 110 160 130 230 140" fill="none" stroke="#38bdf8" stroke-width="3" stroke-linecap="round" opacity="0" />
        <path class="wind-gust" id="wind2" d="M 60 90 C 130 80 190 100 260 110" fill="none" stroke="#60a5fa" stroke-width="3.5" stroke-linecap="round" opacity="0" />
        <path class="wind-gust" id="wind3" d="M 80 150 C 140 145 190 165 250 170" fill="none" stroke="#93c5fd" stroke-width="2.5" stroke-linecap="round" opacity="0" />
      </g>

      
      <g id="splashGroup">
        <circle class="splash-drop" cx="120" cy="220" r="4" fill="#38bdf8" />
        <circle class="splash-drop" cx="130" cy="235" r="5" fill="#0284c7" />
        <circle class="splash-drop" cx="115" cy="245" r="3.5" fill="#bae6fd" />
      </g>

      
      
      <path id="sandSoilPile" d="M 270 270 Q 370 268 470 270 L 470 270 Q 370 270 270 270 Z" fill="url(#sandSoilGrad)" filter="url(#softGlow)" />
      
      
      <g id="grainsGroup" opacity="0">
        <circle cx="340" cy="255" r="2" fill="#78350f" />
        <circle cx="360" cy="252" r="2.5" fill="#fef08a" />
        <circle cx="380" cy="254" r="2" fill="#451a03" />
        <circle cx="400" cy="258" r="2.5" fill="#fde047" />
        <circle cx="350" cy="245" r="2" fill="#fef08a" />
        <circle cx="375" cy="242" r="2" fill="#78350f" />
      </g>

      
      <g id="crumbs"></g>

      
      <path id="boulder" d="M 230 260 C 210 170 260 70 340 70 C 430 70 480 160 460 260 C 450 270 240 270 230 260 Z" fill="url(#boulderGrad)" filter="url(#softGlow)" />
      
      
      <path id="rockCracks" d="M 280 130 Q 310 150 330 140 M 360 110 Q 380 135 390 160" fill="none" stroke="#475569" stroke-width="3" stroke-linecap="round" opacity="0.6" />

      
      
      <g transform="translate(15, 45)">
        <rect class="tag-bg" x="0" y="0" width="160" height="30" />
        <text class="tag" x="80" y="20" text-anchor="middle">Liquid Water &amp; Wind</text>
        <line x1="80" y1="30" x2="95" y2="75" stroke="#94a3b8" stroke-width="1.5" stroke-dasharray="3,3" />
      </g>

      
      <g transform="translate(325, 25)">
        <rect class="tag-bg" x="0" y="0" width="105" height="30" />
        <text class="tag" x="52" y="20" text-anchor="middle">Giant Rock</text>
        <line x1="52" y1="30" x2="52" y2="65" stroke="#94a3b8" stroke-width="1.5" stroke-dasharray="3,3" />
      </g>

      
      <g transform="translate(325, 275)">
        <rect class="tag-bg" x="0" y="0" width="110" height="30" />
        <text class="tag" x="55" y="20" text-anchor="middle">Sand &amp; Soil</text>
        <line x1="55" y1="0" x2="55" y2="-15" stroke="#94a3b8" stroke-width="1.5" stroke-dasharray="3,3" />
      </g>
    </svg>
  </div>

  
  <div class="controls">
    <button class="btn-action" id="weatherBtn">
      <span>💨 🌊 Blow Wind &amp; Splash Water</span>
    </button>
    <button class="btn-reset" id="resetBtn">Reset ↺</button>
  </div>

  <script>
    // Weathering stages (0: Giant boulder -> 4: Worn small rock with big sand & soil mound)
    const stages = [
      {
        boulder: "M 230 260 C 210 170 260 70 340 70 C 430 70 480 160 460 260 C 450 270 240 270 230 260 Z",
        pile: "M 270 270 Q 370 268 470 270 L 470 270 Q 370 270 270 270 Z",
        grainsOpacity: 0
      },
      {
        boulder: "M 245 260 C 230 185 275 95 345 95 C 415 95 460 175 445 260 C 435 270 255 270 245 260 Z",
        pile: "M 255 268 Q 365 248 475 268 L 475 270 Q 365 270 255 270 Z",
        grainsOpacity: 0.3
      },
      {
        boulder: "M 265 260 C 250 195 290 120 350 120 C 405 120 440 190 430 260 C 420 270 275 270 265 260 Z",
        pile: "M 240 266 Q 360 232 480 266 L 480 270 Q 360 270 240 270 Z",
        grainsOpacity: 0.6
      },
      {
        boulder: "M 285 260 C 275 210 305 150 355 150 C 395 150 420 205 415 260 C 405 270 295 270 285 260 Z",
        pile: "M 225 264 Q 355 215 485 264 L 485 270 Q 355 270 225 270 Z",
        grainsOpacity: 0.85
      },
      {
        boulder: "M 305 260 C 295 220 320 180 360 180 C 390 180 405 218 400 260 C 390 270 315 270 305 260 Z",
        pile: "M 215 262 Q 350 198 490 262 L 490 270 Q 350 270 215 270 Z",
        grainsOpacity: 1
      }
    ];

    let currentStage = 0;
    const boulderEl = document.getElementById('boulder');
    const sandSoilEl = document.getElementById('sandSoilPile');
    const grainsGroup = document.getElementById('grainsGroup');
    const crumbsContainer = document.getElementById('crumbs');
    const weatherBtn = document.getElementById('weatherBtn');
    const resetBtn = document.getElementById('resetBtn');

    function triggerWindAndWater() {
      // Animate wind lines
      ['wind1', 'wind2', 'wind3'].forEach((id, idx) => {
        const el = document.getElementById(id);
        el.classList.remove('wind-active');
        void el.offsetWidth; // reflow
        setTimeout(() => el.classList.add('wind-active'), idx * 70);
      });

      // Animate water splashes
      const drops = document.querySelectorAll('.splash-drop');
      drops.forEach((d, idx) => {
        d.classList.remove('splash-active');
        void d.offsetWidth;
        setTimeout(() => d.classList.add('splash-active'), idx * 80);
      });
    }

    function spawnCrumbs() {
      crumbsContainer.innerHTML = '';
      const colors = ['#64748b', '#94a3b8', '#ca8a04', '#78350f', '#fde047'];

      for (let i = 0; i < 7; i++) {
        const circle = document.createElementNS('http://www.w3.org/2000/svg', 'circle');
        const startX = 270 + Math.random() * 120;
        const startY = 120 + Math.random() * 80;
        const targetX = startX + (Math.random() * 60 - 20);
        const targetY = 240 + Math.random() * 25;
        const r = 2 + Math.random() * 2.5;

        circle.setAttribute('cx', startX);
        circle.setAttribute('cy', startY);
        circle.setAttribute('r', r);
        circle.setAttribute('fill', colors[Math.floor(Math.random() * colors.length)]);
        circle.setAttribute('class', 'crumb');
        circle.style.opacity = '1';

        crumbsContainer.appendChild(circle);

        // Animate fall down to soil base
        requestAnimationFrame(() => {
          circle.style.transform = `translate(${targetX - startX}px, ${targetY - startY}px)`;
          setTimeout(() => {
            circle.style.opacity = '0';
          }, 450);
        });
      }
    }

    function updateVisuals() {
      const data = stages[currentStage];
      boulderEl.setAttribute('d', data.boulder);
      sandSoilEl.setAttribute('d', data.pile);
      grainsGroup.style.transition = 'opacity 0.4s ease';
      grainsGroup.style.opacity = data.grainsOpacity;
    }

    weatherBtn.addEventListener('click', () => {
      triggerWindAndWater();
      spawnCrumbs();

      if (currentStage < stages.length - 1) {
        currentStage++;
      } else {
        // Cycle back softly or remain at max
        currentStage = stages.length - 1;
      }
      updateVisuals();
    });

    resetBtn.addEventListener('click', () => {
      currentStage = 0;
      crumbsContainer.innerHTML = '';
      updateVisuals();
    });

    // Initialize
    updateVisuals();
  </script>
</body>
</html>

Earth Materials: Rocks, Soil, and Water Around Us

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

    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #ffffff;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }

    .header {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 12px;
      text-align: center;
      color: #334155;
    }

    .match-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      width: 100%;
      max-width: 500px;
    }

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

    .tile {
      display: flex;
      align-items: center;
      justify-content: flex-start;
      gap: 8px;
      padding: 10px 12px;
      min-height: 58px;
      background: #f8fafc;
      border: 2px solid #e2e8f0;
      border-radius: 12px;
      cursor: pointer;
      font-size: 14px;
      font-weight: 600;
      line-height: 1.25;
      transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
      position: relative;
    }

    .tile-left {
      font-size: 15px;
    }

    .tile-right {
      font-size: 13px;
      color: #475569;
    }

    .tile .icon {
      font-size: 24px;
      flex-shrink: 0;
    }

    /* Selected state */
    .tile.selected {
      background: #eff6ff;
      border-color: #22b7ff;
      box-shadow: 0 0 0 3px rgba(34, 183, 255, 0.25);
    }

    /* Matched state */
    .tile.matched {
      background: #f0fdf4;
      border-color: #22c55e;
      cursor: default;
      color: #166534;
    }

    .tile.matched .badge {
      display: inline-block;
      margin-left: auto;
      color: #16a34a;
      font-size: 16px;
      font-weight: bold;
    }

    .badge {
      display: none;
    }

    /* Sparkle particle overlay */
    .sparkle {
      position: absolute;
      pointer-events: none;
      font-size: 18px;
      animation: popFade 0.6s ease forwards;
    }

    @keyframes popFade {
      0% {
        transform: translate(0, 0) scale(0.5);
        opacity: 1;
      }
      100% {
        transform: translate(var(--tx), var(--ty)) scale(1.3);
        opacity: 0;
      }
    }

    .status-bar {
      margin-top: 12px;
      font-size: 14px;
      font-weight: 600;
      color: #16a34a;
      height: 20px;
      text-align: center;
      transition: opacity 0.3s ease;
      opacity: 0;
    }

    .status-bar.visible {
      opacity: 1;
    }

    .wrong-flash {
      animation: shake 0.35s ease;
      border-color: #ef4444 !important;
      background: #fef2f2 !important;
    }

    @keyframes shake {
      0%, 100% { transform: translateX(0); }
      25% { transform: translateX(-4px); }
      75% { transform: translateX(4px); }
    }
  </style>
</head>
<body>

  <div class="header">Tap a material, then tap its match!</div>

  <div class="match-grid">
    
    <div class="col" id="materialsCol">
      <div class="tile tile-left" data-type="material" data-id="rock">
        <span class="icon">🪨</span>
        <span>Rock</span>
        <span class="badge">✓</span>
      </div>
      <div class="tile tile-left" data-type="material" data-id="soil">
        <span class="icon">🌱</span>
        <span>Soil</span>
        <span class="badge">✓</span>
      </div>
      <div class="tile tile-left" data-type="material" data-id="sand">
        <span class="icon">🏖️</span>
        <span>Sand</span>
        <span class="badge">✓</span>
      </div>
      <div class="tile tile-left" data-type="material" data-id="water">
        <span class="icon">💧</span>
        <span>Water</span>
        <span class="badge">✓</span>
      </div>
    </div>

    
    <div class="col" id="cluesCol">
      <div class="tile tile-right" data-type="clue" data-id="soil">
        <span>Worms live &<br>plants grow</span>
        <span class="badge">✓</span>
      </div>
      <div class="tile tile-right" data-type="clue" data-id="water">
        <span>Liquid that splashes in puddles</span>
        <span class="badge">✓</span>
      </div>
      <div class="tile tile-right" data-type="clue" data-id="rock">
        <span>Hard solid stone you can hold</span>
        <span class="badge">✓</span>
      </div>
      <div class="tile tile-right" data-type="clue" data-id="sand">
        <span>Tiny grains on the beach</span>
        <span class="badge">✓</span>
      </div>
    </div>
  </div>

  <div id="statusBar" class="status-bar">✦ Great job! All matched! ✦</div>

  <script>
    let selectedTile = null;
    let matchedCount = 0;
    const totalPairs = 4;

    const tiles = document.querySelectorAll('.tile');
    const statusBar = document.getElementById('statusBar');

    tiles.forEach(tile => {
      tile.addEventListener('click', () => handleTileClick(tile));
    });

    function handleTileClick(tile) {
      if (tile.classList.contains('matched')) return;

      // Deselect if tapping same tile
      if (selectedTile === tile) {
        tile.classList.remove('selected');
        selectedTile = null;
        return;
      }

      // If nothing selected yet, select this tile
      if (!selectedTile) {
        selectedTile = tile;
        tile.classList.add('selected');
        return;
      }

      // If tapped another tile of the same column, switch selection
      if (selectedTile.dataset.type === tile.dataset.type) {
        selectedTile.classList.remove('selected');
        selectedTile = tile;
        tile.classList.add('selected');
        return;
      }

      // Check match between selectedTile and tile
      const isMatch = selectedTile.dataset.id === tile.dataset.id;

      if (isMatch) {
        // Success
        const tileA = selectedTile;
        const tileB = tile;

        tileA.classList.remove('selected');
        tileB.classList.remove('selected');

        tileA.classList.add('matched');
        tileB.classList.add('matched');

        spawnSparkles(tileA);
        spawnSparkles(tileB);

        selectedTile = null;
        matchedCount++;

        if (matchedCount === totalPairs) {
          statusBar.classList.add('visible');
          if (window.answerCorrect) {
            window.answerCorrect({ answer: 'All matched', explanation: 'All earth materials matched correctly.' });
          }
        }
      } else {
        // Mismatch
        const prev = selectedTile;
        prev.classList.add('wrong-flash');
        tile.classList.add('wrong-flash');

        setTimeout(() => {
          prev.classList.remove('wrong-flash', 'selected');
          tile.classList.remove('wrong-flash');
        }, 350);

        selectedTile = null;
      }
    }

    function spawnSparkles(el) {
      const rect = el.getBoundingClientRect();
      const stars = ['✨', '✦', '⭐'];
      
      for (let i = 0; i < 4; i++) {
        const span = document.createElement('span');
        span.className = 'sparkle';
        span.textContent = stars[i % stars.length];
        
        const angle = (i / 4) * Math.PI * 2;
        const dist = 24 + Math.random() * 16;
        const tx = Math.cos(angle) * dist + 'px';
        const ty = Math.sin(angle) * dist + 'px';
        
        span.style.setProperty('--tx', tx);
        span.style.setProperty('--ty', ty);
        span.style.left = '50%';
        span.style.top = '50%';

        el.appendChild(span);
        setTimeout(() => span.remove(), 600);
      }
    }
  </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;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      width: 100%;
      padding: 10px;
      user-select: none;
    }

    .tabs {
      display: flex;
      gap: 6px;
      width: 100%;
      max-width: 440px;
      margin-bottom: 8px;
    }

    .tab-btn {
      flex: 1;
      border: 1px solid #cbd5e1;
      background: #ffffff;
      padding: 7px 4px;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
      transition: all 0.25s ease;
      box-shadow: 0 1px 2px rgba(0,0,0,0.04);
    }

    .tab-btn.active {
      background: #1e2945;
      color: #ffffff;
      border-color: #1e2945;
      box-shadow: 0 3px 8px rgba(30, 41, 69, 0.2);
    }

    .scene-box {
      position: relative;
      width: 100%;
      max-width: 440px;
      aspect-ratio: 4 / 3;
      border-radius: 14px;
      overflow: hidden;
      box-shadow: 0 4px 12px rgba(0,0,0,0.06);
      background: #e0f2fe;
    }

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

    /* Interactive layer styling */
    .zone {
      cursor: pointer;
      transition: filter 0.3s ease, opacity 0.3s ease;
    }

    .zone:hover {
      filter: brightness(1.05);
    }

    .zone.dimmed {
      opacity: 0.45;
      filter: grayscale(20%);
    }

    .zone.highlighted {
      opacity: 1;
      filter: drop-shadow(0 0 6px rgba(255, 255, 255, 0.95)) drop-shadow(0 0 12px rgba(34, 183, 255, 0.7));
    }

    /* Pop-up info badge */
    .info-card {
      position: absolute;
      top: 10px;
      left: 50%;
      transform: translateX(-50%);
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(4px);
      padding: 6px 14px;
      border-radius: 20px;
      border: 1px solid #e2e8f0;
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
      display: flex;
      align-items: center;
      gap: 8px;
      pointer-events: none;
      transition: all 0.25s ease;
    }

    .info-emoji {
      font-size: 18px;
    }

    .info-text {
      font-size: 14px;
      font-weight: 700;
      color: #0f172a;
    }

    .pulse-indicator {
      transform-origin: center;
      animation: pulse 2s infinite ease-in-out;
    }

    @keyframes pulse {
      0%, 100% { transform: scale(1); opacity: 0.9; }
      50% { transform: scale(1.05); opacity: 1; }
    }
  </style>
</head>
<body>

  <div class="tabs">
    <button class="tab-btn active" data-target="rock">🪨 Rock</button>
    <button class="tab-btn" data-target="sand">🏖️ Sand</button>
    <button class="tab-btn" data-target="soil">🌱 Soil</button>
    <button class="tab-btn" data-target="water">💧 Water</button>
  </div>

  <div class="scene-box">
    <svg class="scene" viewBox="0 0 400 300">
      
      <rect x="0" y="0" width="400" height="300" fill="#e0f2fe"/>
      <circle cx="340" cy="45" r="24" fill="#fef08a" opacity="0.9"/>
      <circle cx="340" cy="45" r="32" fill="#fef9c3" opacity="0.4"/>

      
      <path d="M 0,160 Q 90,130 180,155 T 400,145 L 400,300 L 0,300 Z" fill="#bbf7d0"/>

      
      <g id="zone-rock" class="zone highlighted">
        <polygon points="0,70 110,135 70,220 0,220" fill="#94a3b8"/>
        <polygon points="0,70 45,110 30,220 0,220" fill="#64748b"/>
        
        <polygon points="45,110 110,135 70,220 30,220" fill="#cbd5e1"/>
        <line x1="35" y1="120" x2="65" y2="150" stroke="#475569" stroke-width="2" stroke-linecap="round"/>
        <line x1="65" y1="150" x2="55" y2="185" stroke="#475569" stroke-width="2" stroke-linecap="round"/>
        <line x1="75" y1="130" x2="95" y2="175" stroke="#475569" stroke-width="2" stroke-linecap="round"/>
        
        <ellipse cx="65" cy="210" rx="22" ry="14" fill="#64748b"/>
        <ellipse cx="62" cy="208" rx="18" ry="11" fill="#94a3b8"/>
      </g>

      
      <g id="zone-soil" class="zone dimmed">
        
        <path d="M 230,140 Q 315,130 400,135 L 400,160 Q 315,165 230,160 Z" fill="#86efac"/>
        
        <path d="M 220,155 Q 310,150 400,155 L 400,215 Q 300,225 210,210 Z" fill="#78350f"/>
        
        <circle cx="260" cy="180" r="3" fill="#451a03"/>
        <circle cx="310" cy="175" r="2.5" fill="#9a3412"/>
        <circle cx="365" cy="185" r="3.5" fill="#451a03"/>
        <circle cx="290" cy="195" r="2" fill="#9a3412"/>
        <circle cx="340" cy="198" r="3" fill="#451a03"/>
        
        <path d="M 275,155 Q 270,140 262,138 Q 275,145 275,155" fill="#22c55e"/>
        <path d="M 275,155 Q 282,142 290,140 Q 280,146 275,155" fill="#16a34a"/>
        <path d="M 350,152 Q 345,135 338,132 Q 350,140 350,152" fill="#22c55e"/>
        <path d="M 350,152 Q 358,136 366,134 Q 355,142 350,152" fill="#16a34a"/>
      </g>

      
      <g id="zone-sand" class="zone dimmed">
        <path d="M 120,205 Q 240,185 390,205 L 400,250 Q 220,240 100,245 Z" fill="#fde047"/>
        <path d="M 110,212 Q 240,195 385,212 L 395,245 Q 220,235 95,240 Z" fill="#fef08a"/>
        
        <circle cx="160" cy="222" r="1.5" fill="#ca8a04"/>
        <circle cx="210" cy="216" r="1.5" fill="#ca8a04"/>
        <circle cx="270" cy="220" r="1.5" fill="#ca8a04"/>
        <circle cx="330" cy="225" r="1.5" fill="#ca8a04"/>
        <circle cx="190" cy="232" r="1.5" fill="#ca8a04"/>
        <circle cx="240" cy="228" r="1.5" fill="#ca8a04"/>
      </g>

      
      <g id="zone-water" class="zone dimmed">
        <path d="M 0,225 Q 160,230 400,235 L 400,300 L 0,300 Z" fill="#38bdf8"/>
        
        <path d="M 20,250 Q 80,245 140,252" stroke="#e0f2fe" stroke-width="3" fill="none" stroke-linecap="round"/>
        <path d="M 180,265 Q 260,258 340,266" stroke="#bae6fd" stroke-width="3.5" fill="none" stroke-linecap="round"/>
        <path d="M 60,280 Q 150,273 240,282" stroke="#e0f2fe" stroke-width="2.5" fill="none" stroke-linecap="round"/>
        <path d="M 290,285 Q 340,280 380,286" stroke="#bae6fd" stroke-width="2.5" fill="none" stroke-linecap="round"/>
      </g>
    </svg>

    <div id="infoCard" class="info-card">
      <span id="infoEmoji" class="info-emoji">🪨</span>
      <span id="infoText" class="info-text">Hard and solid</span>
    </div>
  </div>

  <script>
    const materials = {
      rock: {
        emoji: '🪨',
        desc: 'Hard and solid'
      },
      sand: {
        emoji: '🏖️',
        desc: 'Tiny rock grains'
      },
      soil: {
        emoji: '🌱',
        desc: 'Rich dark dirt'
      },
      water: {
        emoji: '💧',
        desc: 'Flowing liquid'
      }
    };

    const tabs = document.querySelectorAll('.tab-btn');
    const zones = {
      rock: document.getElementById('zone-rock'),
      sand: document.getElementById('zone-sand'),
      soil: document.getElementById('zone-soil'),
      water: document.getElementById('zone-water')
    };
    const infoCard = document.getElementById('infoCard');
    const infoEmoji = document.getElementById('infoEmoji');
    const infoText = document.getElementById('infoText');

    function selectMaterial(key) {
      // Update tabs
      tabs.forEach(tab => {
        tab.classList.toggle('active', tab.dataset.target === key);
      });

      // Update SVG zones
      Object.keys(zones).forEach(zKey => {
        if (zKey === key) {
          zones[zKey].classList.remove('dimmed');
          zones[zKey].classList.add('highlighted');
        } else {
          zones[zKey].classList.remove('highlighted');
          zones[zKey].classList.add('dimmed');
        }
      });

      // Update Info Card
      infoEmoji.textContent = materials[key].emoji;
      infoText.textContent = materials[key].desc;
    }

    // Attach click listeners to tabs
    tabs.forEach(tab => {
      tab.addEventListener('click', () => {
        selectMaterial(tab.dataset.target);
      });
    });

    // Attach click listeners directly to scene zones
    Object.keys(zones).forEach(key => {
      zones[key].addEventListener('click', () => {
        selectMaterial(key);
      });
    });
  </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, sans-serif;
      background: #ffffff;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 12px;
      user-select: none;
    }

    /* Stepper Tabs */
    .steps-nav {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 6px;
      width: 100%;
      max-width: 480px;
    }
    .tab-btn {
      background: #f1f5f9;
      border: 2px solid transparent;
      border-radius: 8px;
      padding: 8px 2px;
      font-size: 13px;
      font-weight: 700;
      color: #475569;
      cursor: pointer;
      text-align: center;
      transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    }
    .tab-btn.active {
      background: #fff;
      border-color: #b45309;
      color: #0f172a;
      box-shadow: 0 2px 6px rgba(180, 83, 9, 0.2);
    }

    /* Main Visual Stage */
    .stage {
      position: relative;
      width: 100%;
      max-width: 480px;
      height: 220px;
      background: #f8fafc;
      border-radius: 12px;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 10px 0;
    }

    .step-view {
      position: absolute;
      inset: 0;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s ease, transform 0.3s ease;
      transform: scale(0.96);
    }
    .step-view.active {
      opacity: 1;
      pointer-events: auto;
      transform: scale(1);
    }

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

    /* Controls */
    .controls {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 480px;
      gap: 8px;
    }
    .nav-btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      padding: 9px 14px;
      font-size: 14px;
      font-weight: 700;
      color: #1e293b;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
      transition: background 0.15s ease;
    }
    .nav-btn:active {
      background: #e2e8f0;
    }
    .play-btn {
      background: #b45309;
      border: 1px solid #92400e;
      color: #ffffff;
    }
    .play-btn:active {
      background: #78350f;
    }
    .play-btn.playing {
      background: #92400e;
    }

    @media (max-width: 380px) {
      .tab-btn {
        font-size: 11px;
        padding: 6px 1px;
      }
      .nav-btn {
        padding: 8px 10px;
        font-size: 13px;
      }
    }
  </style>
</head>
<body>

  
  <div class="steps-nav">
    <button class="tab-btn active" data-step="0">1. Boulder</button>
    <button class="tab-btn" data-step="1">2. Stones</button>
    <button class="tab-btn" data-step="2">3. Pebbles</button>
    <button class="tab-btn" data-step="3">4. Sand</button>
  </div>

  
  <div class="stage">
    
    <div class="step-view active" id="view-0">
      <svg class="svg-canvas" viewBox="0 0 320 200">
        <ellipse cx="160" cy="170" rx="90" ry="12" fill="#e2e8f0" />
        
        <polygon points="90,165 60,110 110,50 200,45 255,100 240,165" fill="#64748b" />
        <polygon points="110,50 200,45 180,105 130,115" fill="#94a3b8" />
        <polygon points="200,45 255,100 210,135 180,105" fill="#475569" />
        <polygon points="90,165 60,110 130,115" fill="#475569" />
        <polygon points="130,115 180,105 210,135 240,165 90,165" fill="#334155" />
        <text x="160" y="30" text-anchor="middle" font-size="14" font-weight="bold" fill="#0f172a">1. Huge Boulder</text>
      </svg>
    </div>

    
    <div class="step-view" id="view-1">
      <svg class="svg-canvas" viewBox="0 0 320 200">
        
        <ellipse cx="100" cy="165" rx="40" ry="8" fill="#e2e8f0" />
        <ellipse cx="215" cy="165" rx="45" ry="8" fill="#e2e8f0" />
        <ellipse cx="160" cy="115" rx="30" ry="6" fill="#e2e8f0" />

        
        <path d="M150,60 L160,80 L145,95" stroke="#b45309" stroke-width="2" fill="none" stroke-dasharray="3 3"/>
        <path d="M170,65 L165,85 L180,100" stroke="#b45309" stroke-width="2" fill="none" stroke-dasharray="3 3"/>

        
        <polygon points="70,160 55,130 85,95 125,120 120,160" fill="#64748b" />
        <polygon points="85,95 125,120 100,140" fill="#94a3b8" />
        
        <polygon points="180,160 170,125 220,100 255,135 245,160" fill="#475569" />
        <polygon points="220,100 255,135 215,145" fill="#64748b" />
        
        <polygon points="140,110 135,85 165,70 185,90 175,110" fill="#64748b" />
        <polygon points="165,70 185,90 160,100" fill="#94a3b8" />

        <text x="160" y="30" text-anchor="middle" font-size="14" font-weight="bold" fill="#0f172a">2. Breaks into Stones</text>
      </svg>
    </div>

    
    <div class="step-view" id="view-2">
      <svg class="svg-canvas" viewBox="0 0 320 200">
        
        <ellipse cx="160" cy="155" rx="110" ry="20" fill="#e2e8f0" />
        
        <ellipse cx="110" cy="155" rx="16" ry="10" fill="#64748b" />
        <ellipse cx="108" cy="152" rx="12" ry="7" fill="#94a3b8" />

        <ellipse cx="150" cy="162" rx="14" ry="9" fill="#475569" />
        <ellipse cx="148" cy="160" rx="10" ry="6" fill="#64748b" />

        <ellipse cx="190" cy="156" rx="18" ry="11" fill="#64748b" />
        <ellipse cx="188" cy="153" rx="14" ry="8" fill="#94a3b8" />

        <ellipse cx="225" cy="148" rx="12" ry="8" fill="#475569" />
        <ellipse cx="80" cy="148" rx="13" ry="8" fill="#64748b" />
        <ellipse cx="160" cy="140" rx="15" ry="9" fill="#94a3b8" />
        <ellipse cx="130" cy="145" rx="11" ry="7" fill="#475569" />

        <text x="160" y="30" text-anchor="middle" font-size="14" font-weight="bold" fill="#0f172a">3. Worn into Pebbles</text>
      </svg>
    </div>

    
    <div class="step-view" id="view-3">
      <svg class="svg-canvas" viewBox="0 0 320 200">
        
        <path d="M 20,175 Q 75,120 135,175 Z" fill="#d97706" />
        <path d="M 40,175 Q 85,135 125,175 Z" fill="#f59e0b" opacity="0.8"/>
        <text x="75" y="190" text-anchor="middle" font-size="12" font-weight="bold" fill="#78350f">Beach Sand</text>

        
        <line x1="85" y1="145" x2="190" y2="95" stroke="#b45309" stroke-width="2" stroke-dasharray="4 4"/>

        
        <g transform="translate(40, 0)">
          <circle cx="180" cy="95" r="52" fill="#fff" stroke="#b45309" stroke-width="4" />
          <circle cx="180" cy="95" r="48" fill="#fef3c7" />

          
          <polygon points="160,85 152,75 168,70 172,82" fill="#64748b" />
          <polygon points="190,75 202,68 210,80 196,88" fill="#d97706" />
          <polygon points="155,115 165,100 178,112 168,124" fill="#475569" />
          <polygon points="195,110 185,98 200,92 208,105" fill="#94a3b8" />
          <polygon points="175,92 182,86 186,94 178,98" fill="#b45309" />

          
          <line x1="218" y1="133" x2="245" y2="160" stroke="#78350f" stroke-width="6" stroke-linecap="round"/>

          <text x="180" y="30" text-anchor="middle" font-size="13" font-weight="bold" fill="#0f172a">4. Sand = Tiny Rock Pieces!</text>
        </g>
      </svg>
    </div>
  </div>

  
  <div class="controls">
    <button class="nav-btn" id="prevBtn">◀ Back</button>
    <button class="nav-btn play-btn" id="playBtn">▶ Auto Play</button>
    <button class="nav-btn" id="nextBtn">Next ▶</button>
  </div>

  <script>
    const $ = (sel) => document.querySelector(sel);
    const $$ = (sel) => document.querySelectorAll(sel);
    const onTap = (el, fn) => {
      if (!el) return;
      el.addEventListener('click', fn);
    };

    const tabs = $$('.tab-btn');
    const views = $$('.step-view');
    const playBtn = $('#playBtn');
    const prevBtn = $('#prevBtn');
    const nextBtn = $('#nextBtn');

    let currentStep = 0;
    let timer = null;

    function setStep(index) {
      currentStep = (index + 4) % 4;
      tabs.forEach((tab, i) => {
        tab.classList.toggle('active', i === currentStep);
      });
      views.forEach((view, i) => {
        view.classList.toggle('active', i === currentStep);
      });
    }

    function toggleAutoPlay() {
      if (timer) {
        clearInterval(timer);
        timer = null;
        playBtn.textContent = '▶ Auto Play';
        playBtn.classList.remove('playing');
      } else {
        playBtn.textContent = '⏸ Pause';
        playBtn.classList.add('playing');
        timer = setInterval(() => {
          setStep(currentStep + 1);
        }, 2500);
      }
    }

    tabs.forEach((tab, i) => {
      onTap(tab, () => {
        if (timer) toggleAutoPlay();
        setStep(i);
      });
    });

    onTap(prevBtn, () => {
      if (timer) toggleAutoPlay();
      setStep(currentStep - 1);
    });

    onTap(nextBtn, () => {
      if (timer) toggleAutoPlay();
      setStep(currentStep + 1);
    });

    onTap(playBtn, toggleAutoPlay);
  </script>
</body>
</html>

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

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #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.1

Aligned learning resources

Related diagrams