<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 12px 10px;
      min-height: 100%;
      user-select: none;
    }

    .header-badge {
      background: #e0f2fe;
      color: #0369a1;
      border: 1px solid #bae6fd;
      font-weight: 700;
      font-size: 15px;
      padding: 6px 16px;
      border-radius: 20px;
      letter-spacing: -0.2px;
      text-align: center;
    }

    .stage {
      position: relative;
      width: 100%;
      max-width: 480px;
      height: 250px;
      margin: 8px 0;
    }

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

    /* Pitcher */
    .pitcher-group {
      transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
      transform-origin: 35px 25px;
    }

    .state-1 .pitcher-group {
      transform: translate(95px, 20px) rotate(-32deg);
    }

    .state-2 .pitcher-group {
      transform: translate(295px, 50px) rotate(-32deg);
    }

    /* Pouring Streams */
    .stream {
      stroke: #0284c7;
      stroke-width: 4.5;
      stroke-linecap: round;
      opacity: 0;
      stroke-dasharray: 6 3;
      animation: pourFlow 0.4s linear infinite;
      transition: opacity 0.3s ease;
    }

    @keyframes pourFlow {
      from { stroke-dashoffset: 0; }
      to { stroke-dashoffset: -18; }
    }

    .state-1 .stream-1 {
      opacity: 0.9;
    }

    .state-2 .stream-2 {
      opacity: 0.9;
    }

    /* Liquids */
    .liquid-glass {
      transform-origin: center 220px;
      transition: transform 0.7s ease, opacity 0.5s ease;
    }

    .liquid-bowl {
      transform-origin: center 220px;
      transition: transform 0.7s ease, opacity 0.5s ease;
    }

    .state-1 .liquid-glass {
      transform: scaleY(1);
      opacity: 1;
    }
    .state-1 .liquid-bowl {
      transform: scaleY(0.2);
      opacity: 0.3;
    }

    .state-2 .liquid-glass {
      transform: scaleY(0.2);
      opacity: 0.3;
    }
    .state-2 .liquid-bowl {
      transform: scaleY(1);
      opacity: 1;
    }

    /* Container Highlight Cards */
    .glass-box, .bowl-box {
      transition: opacity 0.4s ease;
    }

    .state-1 .glass-box { opacity: 1; }
    .state-1 .bowl-box { opacity: 0.45; }

    .state-2 .glass-box { opacity: 0.45; }
    .state-2 .bowl-box { opacity: 1; }

    /* Text Labels inside SVG */
    .cup-label {
      font-size: 14px;
      font-weight: 700;
      fill: #1e2945;
      text-anchor: middle;
    }

    /* Controls */
    .controls {
      display: flex;
      gap: 8px;
      align-items: center;
      justify-content: center;
      width: 100%;
      max-width: 420px;
    }

    .btn {
      flex: 1;
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 8px;
      border: 1px solid #cbd5e1;
      background: #ffffff;
      color: #475569;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: background-color 0.2s, border-color 0.2s, color 0.2s;
    }

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

    .btn-play {
      flex: 0 0 42px;
      padding: 8px 0;
    }
  </style>
</head>
<body>

  <div class="header-badge">
    Changes shape to fit container!
  </div>

  <div id="stage" class="stage state-1">
    <svg viewBox="0 0 460 250">
      <defs>
        
        <linearGradient id="liquidGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#38bdf8"/>
          <stop offset="100%" stop-color="#0284c7"/>
        </linearGradient>

        
        <linearGradient id="glassGrad" x1="0" y1="0" x2="1" y2="0">
          <stop offset="0%" stop-color="rgba(255,255,255,0.7)"/>
          <stop offset="50%" stop-color="rgba(255,255,255,0.1)"/>
          <stop offset="100%" stop-color="rgba(255,255,255,0.5)"/>
        </linearGradient>

        
        <filter id="glow" x="-10%" y="-10%" width="120%" height="120%">
          <feDropShadow dx="0" dy="2" stdDeviation="3" flood-opacity="0.08"/>
        </filter>
      </defs>

      
      <line x1="20" y1="222" x2="440" y2="222" stroke="#cbd5e1" stroke-width="2" stroke-linecap="round"/>

      
      <g class="glass-box">
        
        <rect class="liquid-glass" x="103" y="125" width="54" height="95" rx="3" fill="url(#liquidGrad)"/>
        
        <rect x="100" y="115" width="60" height="106" rx="4" fill="rgba(240, 249, 255, 0.35)" stroke="#64748b" stroke-width="2.5" filter="url(#glow)"/>
        
        <rect x="103" y="118" width="10" height="100" rx="2" fill="url(#glassGrad)"/>
        
        <text class="cup-label" x="130" y="244">Tall &amp; narrow</text>
      </g>

      
      <g class="bowl-box">
        
        <path class="liquid-bowl" d="M 273,180 Q 340,180 407,180 Q 402,220 340,220 Q 278,220 273,180 Z" fill="url(#liquidGrad)"/>
        
        <path d="M 270,170 Q 340,170 410,170 Q 404,221 340,221 Q 276,221 270,170 Z" fill="rgba(240, 249, 255, 0.35)" stroke="#64748b" stroke-width="2.5" filter="url(#glow)"/>
        
        <ellipse cx="340" cy="170" rx="70" ry="8" fill="none" stroke="#64748b" stroke-width="2"/>
        
        <text class="cup-label" x="340" y="244">Wide &amp; flat</text>
      </g>

      
      <path class="stream stream-1" d="M 130,85 Q 130,110 130,130"/>
      <path class="stream stream-2" d="M 338,125 Q 338,150 338,175"/>

      
      <g id="pitcher" class="pitcher-group">
        
        <path d="M 10,10 L 48,10 L 42,65 L 12,65 Z" fill="rgba(255, 255, 255, 0.85)" stroke="#334155" stroke-width="2.5"/>
        
        <path d="M 48,10 L 58,16 L 46,24 Z" fill="#bae6fd" stroke="#334155" stroke-width="2"/>
        
        <path d="M 10,16 C -6,16 -6,56 12,56" fill="none" stroke="#334155" stroke-width="3" stroke-linecap="round"/>
        
        <path d="M 12,30 L 45,30 L 41,63 L 13,63 Z" fill="url(#liquidGrad)" opacity="0.9"/>
        
        <line x1="28" y1="38" x2="38" y2="38" stroke="#ffffff" stroke-width="1.5"/>
        <line x1="30" y1="46" x2="38" y2="46" stroke="#ffffff" stroke-width="1.5"/>
        <line x1="28" y1="54" x2="38" y2="54" stroke="#ffffff" stroke-width="1.5"/>
      </g>
    </svg>
  </div>

  
  <div class="controls">
    <button id="btn1" class="btn active" onclick="setStep(1)">
      1. Tall Glass
    </button>
    <button id="btn2" class="btn" onclick="setStep(2)">
      2. Wide Bowl
    </button>
    <button id="playBtn" class="btn btn-play" onclick="togglePlay()" title="Play/Pause">
      ⏸
    </button>
  </div>

  <script>
    let currentStep = 1;
    let isPlaying = true;
    let timer = null;

    const stage = document.getElementById('stage');
    const btn1 = document.getElementById('btn1');
    const btn2 = document.getElementById('btn2');
    const playBtn = document.getElementById('playBtn');

    function setStep(step) {
      currentStep = step;
      stage.className = 'stage state-' + step;
      
      btn1.classList.toggle('active', step === 1);
      btn2.classList.toggle('active', step === 2);
    }

    function nextStep() {
      setStep(currentStep === 1 ? 2 : 1);
    }

    function startAutoPlay() {
      if (timer) clearInterval(timer);
      timer = setInterval(nextStep, 3200);
      isPlaying = true;
      playBtn.textContent = '⏸';
    }

    function pauseAutoPlay() {
      if (timer) clearInterval(timer);
      timer = null;
      isPlaying = false;
      playBtn.textContent = '▶';
    }

    function togglePlay() {
      if (isPlaying) {
        pauseAutoPlay();
      } else {
        nextStep();
        startAutoPlay();
      }
    }

    // Start auto-cycling on mount
    startAutoPlay();
  </script>
</body>
</html>

Sorting Materials into Solids, Liquids, and Gases

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: #f8fafc;
      color: #0f172a;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 10px 8px;
      user-select: none;
      min-height: 100vh;
      box-sizing: border-box;
    }

    .container {
      width: 100%;
      max-width: 620px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }

    .stage {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    svg {
      width: 100%;
      height: auto;
      max-height: 330px;
      display: block;
    }

    /* Controls */
    .controls {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      width: 100%;
      max-width: 480px;
      flex-wrap: wrap;
    }

    .btn {
      background: #ffffff;
      border: 1.5px solid #cbd5e1;
      color: #1e293b;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 700;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background-color 0.2s, border-color 0.2s, color 0.2s, box-shadow 0.2s;
    }

    .btn:active {
      background: #f1f5f9;
    }

    .btn.active {
      background: #0284c7;
      border-color: #0369a1;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(2, 132, 199, 0.35);
    }

    .btn-icon {
      width: 32px;
      height: 32px;
      padding: 0;
      border-radius: 50%;
      font-size: 13px;
    }

    /* Floating particles animation */
    .pulse-particle {
      animation: float 2.5s infinite ease-in-out alternate;
    }
    @keyframes float {
      0% { transform: translate(0, 0); }
      100% { transform: translate(2px, -2px); }
    }

    @media (max-width: 420px) {
      .btn {
        padding: 5px 10px;
        font-size: 12px;
      }
      .btn-icon {
        width: 28px;
        height: 28px;
      }
    }
  </style>
</head>
<body>

  <div class="container">
    <div class="stage">
      <svg viewBox="0 0 500 270" role="img" aria-label="Illustration of a yellow balloon inflating with air particles pushing walls outward">
        <defs>
          
          <radialGradient id="balloonGrad" cx="36%" cy="32%" r="65%">
            <stop offset="0%" stop-color="#fffbeb" />
            <stop offset="25%" stop-color="#fde047" />
            <stop offset="75%" stop-color="#eab308" />
            <stop offset="100%" stop-color="#ca8a04" />
          </radialGradient>

          
          <marker id="forceArrow" viewBox="0 0 8 8" refX="7" refY="4" markerWidth="5" markerHeight="5" orient="auto-start-reverse">
            <path d="M 0 1.5 L 7 4 L 0 6.5 z" fill="#ea580c" />
          </marker>

          
          <filter id="shadow" x="-5%" y="-15%" width="115%" height="140%">
            <feDropShadow dx="0" dy="2" stdDeviation="3" flood-opacity="0.18" flood-color="#0f172a" />
          </filter>
        </defs>

        
        <g id="mouthGroup" transform="translate(14, 82)">
          
          <path d="M 12 35 C 12 10, 36 -2, 60 4 C 74 8, 80 22, 80 38 C 80 44, 76 50, 72 54 L 88 56 C 92 57, 92 63, 88 65 L 70 67 C 68 76, 60 88, 48 94 C 28 102, 12 88, 12 60 Z" fill="#fed7aa" stroke="#f97316" stroke-width="2.5" />
          
          <ellipse cx="58" cy="36" rx="4" ry="4.5" fill="#7c2d12" />
          <circle cx="59.5" cy="34.5" r="1.2" fill="#ffffff" />
          
          <path d="M 52 27 Q 58 24 65 27" stroke="#7c2d12" stroke-width="2" fill="none" stroke-linecap="round" />
          
          <path d="M 72 38 Q 78 44 74 50" stroke="#f97316" stroke-width="2" fill="none" stroke-linecap="round" />
          
          <path d="M 44 54 Q 48 64 42 74" stroke="#fb923c" stroke-width="2" stroke-dasharray="2 3" fill="none" />
          
          <path d="M 72 54 C 84 52, 90 54, 94 58 C 90 62, 84 64, 72 66 Z" fill="#f87171" stroke="#dc2626" stroke-width="2" />
          <ellipse cx="94" cy="59" rx="3.5" ry="5.5" fill="#991b1b" />
        </g>

        
        <g id="balloonNeck" transform="translate(122, 141)">
          
          <polygon points="-2,0 12,-7 12,7" fill="#ca8a04" stroke="#a16207" stroke-width="1.5" />
          
          <path id="neckTube" d="M 12,-6 Q 26,-6 38,-12 L 38,12 Q 26,6 12,6 Z" fill="#eab308" stroke="#ca8a04" stroke-width="1.5" />
        </g>

        
        <g id="balloonGroup">
          
          <ellipse id="balloonShadow" cx="305" cy="245" rx="80" ry="11" fill="#000000" opacity="0.1" />
          
          
          <ellipse id="balloonBody" cx="295" cy="141" rx="125" ry="94" fill="url(#balloonGrad)" stroke="#ca8a04" stroke-width="3" />
          
          
          <ellipse id="balloonGloss" cx="250" cy="95" rx="42" ry="19" fill="#ffffff" opacity="0.55" transform="rotate(-22 250 95)" />
        </g>

        
        <g id="forceArrows" opacity="1" style="transition: opacity 0.3s ease;">
          
          <line x1="295" y1="88" x2="295" y2="48" stroke="#ea580c" stroke-width="3.5" stroke-dasharray="4 2" marker-end="url(#forceArrow)" />
          
          <line x1="295" y1="194" x2="295" y2="234" stroke="#ea580c" stroke-width="3.5" stroke-dasharray="4 2" marker-end="url(#forceArrow)" />
          
          <line x1="375" y1="141" x2="422" y2="141" stroke="#ea580c" stroke-width="3.5" stroke-dasharray="4 2" marker-end="url(#forceArrow)" />
          
          <line x1="355" y1="102" x2="395" y2="70" stroke="#ea580c" stroke-width="3.5" stroke-dasharray="4 2" marker-end="url(#forceArrow)" />
          
          <line x1="355" y1="180" x2="395" y2="212" stroke="#ea580c" stroke-width="3.5" stroke-dasharray="4 2" marker-end="url(#forceArrow)" />
          
          <line x1="235" y1="102" x2="200" y2="72" stroke="#ea580c" stroke-width="3.5" stroke-dasharray="4 2" marker-end="url(#forceArrow)" />
          
          <line x1="235" y1="180" x2="200" y2="210" stroke="#ea580c" stroke-width="3.5" stroke-dasharray="4 2" marker-end="url(#forceArrow)" />
        </g>

        
        <g id="particlesGroup">
          
          <g id="streamParticles" style="transition: opacity 0.3s ease;">
            <circle cx="112" cy="141" r="3.5" fill="#0284c7" />
            <circle cx="128" cy="139" r="4" fill="#0284c7" />
            <circle cx="145" cy="143" r="3.5" fill="#0284c7" />
            <circle cx="160" cy="140" r="4" fill="#0284c7" />
            
            <path d="M 104,136 Q 130,136 154,136" stroke="#38bdf8" stroke-width="2.5" stroke-dasharray="5 3" fill="none" />
            <path d="M 108,146 Q 134,146 158,146" stroke="#38bdf8" stroke-width="2.5" stroke-dasharray="5 3" fill="none" />
          </g>

          
          <g id="insideParticles" class="pulse-particle" style="transition: opacity 0.3s ease;">
            <circle cx="205" cy="141" r="4.5" fill="#0369a1" stroke="#bae6fd" stroke-width="1.5" />
            <circle cx="230" cy="116" r="4.5" fill="#0369a1" stroke="#bae6fd" stroke-width="1.5" />
            <circle cx="230" cy="166" r="4.5" fill="#0369a1" stroke="#bae6fd" stroke-width="1.5" />
            <circle cx="270" cy="95"  r="4.5" fill="#0369a1" stroke="#bae6fd" stroke-width="1.5" />
            <circle cx="270" cy="141" r="4.5" fill="#0369a1" stroke="#bae6fd" stroke-width="1.5" />
            <circle cx="270" cy="187" r="4.5" fill="#0369a1" stroke="#bae6fd" stroke-width="1.5" />
            <circle cx="315" cy="85"  r="4.5" fill="#0369a1" stroke="#bae6fd" stroke-width="1.5" />
            <circle cx="315" cy="130" r="4.5" fill="#0369a1" stroke="#bae6fd" stroke-width="1.5" />
            <circle cx="315" cy="175" r="4.5" fill="#0369a1" stroke="#bae6fd" stroke-width="1.5" />
            <circle cx="355" cy="110" r="4.5" fill="#0369a1" stroke="#bae6fd" stroke-width="1.5" />
            <circle cx="355" cy="165" r="4.5" fill="#0369a1" stroke="#bae6fd" stroke-width="1.5" />
            <circle cx="385" cy="138" r="4.5" fill="#0369a1" stroke="#bae6fd" stroke-width="1.5" />
          </g>
        </g>

        
        <g id="calloutBubble" filter="url(#shadow)" style="transition: opacity 0.3s ease;">
          
          <rect x="180" y="6" width="285" height="34" rx="17" fill="#0f172a" stroke="#38bdf8" stroke-width="2" />
          
          <polygon points="285,40 300,40 292,49" fill="#0f172a" />
          <polyline points="284,40 292,49 301,40" stroke="#38bdf8" stroke-width="2" fill="none" stroke-linecap="round" />
          
          <text id="calloutText" x="322" y="28" text-anchor="middle" fill="#ffffff" font-size="13.5" font-weight="700" letter-spacing="0.2px">Air pushes out and fills the balloon!</text>
        </g>
      </svg>
    </div>

    
    <div class="controls">
      <button class="btn btn-icon" id="playBtn" onclick="togglePlay()" title="Play / Pause" aria-label="Toggle autoplay">⏸</button>
      <button class="btn" id="step0" onclick="setStep(0)">1. Start</button>
      <button class="btn" id="step1" onclick="setStep(1)">2. Expanding</button>
      <button class="btn active" id="step2" onclick="setStep(2)">3. Full Balloon</button>
    </div>
  </div>

  <script>
    let currentStep = 2;
    let isPlaying = true;
    let timer = null;

    const balloonBody = document.getElementById('balloonBody');
    const balloonGloss = document.getElementById('balloonGloss');
    const balloonShadow = document.getElementById('balloonShadow');
    const neckTube = document.getElementById('neckTube');
    const forceArrows = document.getElementById('forceArrows');
    const calloutBubble = document.getElementById('calloutBubble');
    const calloutText = document.getElementById('calloutText');
    const insideParticles = document.getElementById('insideParticles');
    const streamParticles = document.getElementById('streamParticles');
    const playBtn = document.getElementById('playBtn');

    const stepsData = [
      {
        rx: 40, ry: 24, cx: 190, cy: 141,
        glossRx: 14, glossRy: 7, glossCx: 178, glossCy: 132,
        shadowRx: 32,
        neckD: "M 12,-3 Q 18,-3 22,-5 L 22,5 Q 18,3 12,3 Z",
        streamOpacity: 0.35,
        insideOpacity: 0.1,
        arrowsOpacity: 0,
        bubbleOpacity: 0.85,
        text: "Air begins blowing inside"
      },
      {
        rx: 85, ry: 65, cx: 245, cy: 141,
        glossRx: 28, glossRy: 13, glossCx: 215, glossCy: 110,
        shadowRx: 58,
        neckD: "M 12,-4 Q 24,-4 30,-9 L 30,9 Q 24,4 12,4 Z",
        streamOpacity: 1,
        insideOpacity: 0.7,
        arrowsOpacity: 0.45,
        bubbleOpacity: 0.95,
        text: "Air particles push outward"
      },
      {
        rx: 125, ry: 94, cx: 295, cy: 141,
        glossRx: 42, glossRy: 19, glossCx: 250, glossCy: 95,
        shadowRx: 80,
        neckD: "M 12,-6 Q 26,-6 38,-12 L 38,12 Q 26,6 12,6 Z",
        streamOpacity: 1,
        insideOpacity: 1,
        arrowsOpacity: 1,
        bubbleOpacity: 1,
        text: "Air pushes out and fills the balloon!"
      }
    ];

    function applyState(idx) {
      const data = stepsData[idx];

      balloonBody.style.transition = 'all 0.45s ease';
      balloonBody.setAttribute('rx', data.rx);
      balloonBody.setAttribute('ry', data.ry);
      balloonBody.setAttribute('cx', data.cx);
      balloonBody.setAttribute('cy', data.cy);

      balloonGloss.style.transition = 'all 0.45s ease';
      balloonGloss.setAttribute('rx', data.glossRx);
      balloonGloss.setAttribute('ry', data.glossRy);
      balloonGloss.setAttribute('cx', data.glossCx);
      balloonGloss.setAttribute('cy', data.glossCy);

      balloonShadow.style.transition = 'all 0.45s ease';
      balloonShadow.setAttribute('rx', data.shadowRx);

      neckTube.setAttribute('d', data.neckD);

      streamParticles.style.opacity = data.streamOpacity;
      insideParticles.style.opacity = data.insideOpacity;
      forceArrows.style.opacity = data.arrowsOpacity;
      calloutBubble.style.opacity = data.bubbleOpacity;
      calloutText.textContent = data.text;

      for (let i = 0; i < 3; i++) {
        const btn = document.getElementById('step' + i);
        if (i === idx) {
          btn.classList.add('active');
        } else {
          btn.classList.remove('active');
        }
      }
    }

    function setStep(idx) {
      currentStep = idx;
      applyState(currentStep);
    }

    function nextStep() {
      currentStep = (currentStep + 1) % 3;
      applyState(currentStep);
    }

    function togglePlay() {
      isPlaying = !isPlaying;
      playBtn.textContent = isPlaying ? '⏸' : '▶';
      if (isPlaying) {
        startLoop();
      } else {
        clearInterval(timer);
      }
    }

    function startLoop() {
      clearInterval(timer);
      timer = setInterval(() => {
        nextStep();
      }, 3000);
    }

    // Initialize state
    applyState(currentStep);
    startLoop();
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <title>Solids, Liquids, Gases</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: transparent;
      color: #1e2945;
      padding: 8px;
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 100%;
    }
    .grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      width: 100%;
      max-width: 680px;
    }
    .state-card {
      border-radius: 16px;
      padding: 12px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      position: relative;
      cursor: pointer;
      user-select: none;
      transition: box-shadow 0.25s ease, background-color 0.25s ease;
      box-shadow: 0 2px 6px rgba(0,0,0,0.05);
    }
    
    /* Solid Theme */
    .solid {
      background: #fff7ed;
      border: 2px solid #fdba74;
    }
    .solid.active {
      box-shadow: 0 0 0 3px #f97316, 0 6px 12px rgba(249, 115, 22, 0.15);
      background: #ffedd5;
    }
    .solid .tag {
      background: #ea580c;
      color: #ffffff;
    }
    .solid .desc {
      color: #9a3412;
    }

    /* Liquid Theme */
    .liquid {
      background: #f0f9ff;
      border: 2px solid #7dd3fc;
    }
    .liquid.active {
      box-shadow: 0 0 0 3px #0284c7, 0 6px 12px rgba(2, 132, 199, 0.15);
      background: #e0f2fe;
    }
    .liquid .tag {
      background: #0284c7;
      color: #ffffff;
    }
    .liquid .desc {
      color: #075985;
    }

    /* Gas Theme */
    .gas {
      background: #faf5ff;
      border: 2px solid #d8b4fe;
    }
    .gas.active {
      box-shadow: 0 0 0 3px #9333ea, 0 6px 12px rgba(147, 51, 234, 0.15);
      background: #f3e8ff;
    }
    .gas .tag {
      background: #9333ea;
      color: #ffffff;
    }
    .gas .desc {
      color: #6b21a8;
    }

    .tag {
      font-size: 17px;
      font-weight: 800;
      padding: 4px 12px;
      border-radius: 999px;
      letter-spacing: 0.5px;
      margin-bottom: 8px;
    }

    .icon-box {
      font-size: 38px;
      line-height: 1.1;
      height: 76px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 2px;
      margin: 6px 0;
    }

    .icon-row {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }

    .desc {
      font-size: 13px;
      font-weight: 700;
      line-height: 1.25;
      margin-top: 4px;
    }

    /* Floating / flowing animations */
    .float-item {
      animation: gentle-drift 3.5s ease-in-out infinite alternate;
    }
    .flow-item {
      animation: gentle-wave 3s ease-in-out infinite alternate;
    }

    @keyframes gentle-drift {
      0% { transform: translateY(0); }
      100% { transform: translateY(-4px); }
    }
    @keyframes gentle-wave {
      0% { transform: translateY(0) rotate(0deg); }
      100% { transform: translateY(2px) rotate(2deg); }
    }

    @media (max-width: 420px) {
      .tag {
        font-size: 15px;
        padding: 3px 8px;
      }
      .icon-box {
        font-size: 30px;
        height: 64px;
      }
      .desc {
        font-size: 12px;
      }
    }
  </style>
</head>
<body>

  <div class="grid">
    
    <div class="state-card solid" id="card-solid">
      <div class="tag">Solid</div>
      <div class="icon-box">
        <div class="icon-row">
          <span>🖍️</span>
          <span>🍎</span>
        </div>
      </div>
      <div class="desc">Holds its<br>shape</div>
    </div>

    
    <div class="state-card liquid" id="card-liquid">
      <div class="tag">Liquid</div>
      <div class="icon-box flow-item">
        <div class="icon-row">
          <span>🥛</span>
          <span>💧</span>
        </div>
      </div>
      <div class="desc">Flows and<br>pours</div>
    </div>

    
    <div class="state-card gas" id="card-gas">
      <div class="tag">Gas</div>
      <div class="icon-box float-item">
        <div class="icon-row">
          <span>🎈</span>
          <span>🫧</span>
        </div>
      </div>
      <div class="desc">Spreads<br>everywhere</div>
    </div>
  </div>

  <script>
    const cards = document.querySelectorAll('.state-card');
    
    function playTone(freq) {
      try {
        const ctx = new (window.AudioContext || window.webkitAudioContext)();
        const osc = ctx.createOscillator();
        const gain = ctx.createGain();
        osc.frequency.setValueAtTime(freq, ctx.currentTime);
        osc.connect(gain);
        gain.connect(ctx.destination);
        gain.gain.setValueAtTime(0.15, ctx.currentTime);
        gain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + 0.25);
        osc.start();
        osc.stop(ctx.currentTime + 0.25);
      } catch (e) {}
    }

    const tones = {
      'card-solid': 330,  // E4
      'card-liquid': 440, // A4
      'card-gas': 587.33  // D5
    };

    cards.forEach(card => {
      card.addEventListener('pointerdown', () => {
        cards.forEach(c => c.classList.remove('active'));
        card.classList.add('active');
        if (tones[card.id]) {
          playTone(tones[card.id]);
        }
      });
    });
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

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

    .panels-container {
      display: flex;
      flex-direction: row;
      justify-content: center;
      gap: 12px;
      width: 100%;
      max-width: 620px;
    }

    .spot-card {
      flex: 1;
      min-width: 0;
      background: #f8fafc;
      border: 2px solid #e2e8f0;
      border-radius: 16px;
      padding: 12px 6px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      transition: transform 0.2s ease, border-color 0.2s ease;
      cursor: pointer;
      user-select: none;
    }

    .spot-card:active {
      transform: scale(0.98);
    }

    .badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
      background: #dcfce7;
      border: 1.5px solid #86efac;
      color: #15803d;
      font-size: 13px;
      font-weight: 700;
      padding: 4px 8px;
      border-radius: 999px;
      white-space: nowrap;
      margin-bottom: 8px;
    }

    .badge-icon {
      font-size: 14px;
      line-height: 1;
    }

    .scene-svg {
      width: 100%;
      max-width: 150px;
      height: 140px;
      display: block;
    }

    .caption {
      font-size: 14px;
      font-weight: 700;
      color: #475569;
      margin-top: 6px;
    }

    @media (max-width: 420px) {
      .badge {
        font-size: 11px;
        padding: 3px 6px;
      }
      .scene-svg {
        height: 115px;
      }
      .caption {
        font-size: 12px;
      }
      .panels-container {
        gap: 6px;
      }
    }
  </style>
</head>
<body>

  <div class="panels-container">
    
    <div class="spot-card">
      <div class="badge">
        <span class="badge-icon">✓</span> Same Shape!
      </div>
      <svg class="scene-svg" viewBox="0 0 140 130" xmlns="http://www.w3.org/2000/svg">
        
        <g id="hand">
          <path d="M 45 125 C 45 105, 35 98, 30 88 C 26 80, 32 74, 38 80 C 44 86, 48 88, 52 86 C 52 72, 54 62, 60 62 C 65 62, 67 72, 67 82 C 70 70, 75 66, 80 66 C 85 66, 86 74, 86 82 C 89 72, 94 70, 98 70 C 103 70, 105 78, 103 88 C 100 102, 90 115, 88 125 Z" fill="#fcd34d" stroke="#f59e0b" stroke-width="3" stroke-linejoin="round" />
          
          <path d="M 50 94 Q 70 100 85 92" fill="none" stroke="#f59e0b" stroke-width="2.5" stroke-linecap="round" />
        </g>
        
        <g transform="translate(42, 28)">
          
          <polygon points="28,2 54,15 28,28 2,15" fill="#ff7675" stroke="#d63031" stroke-width="2.5" stroke-linejoin="round" />
          
          <polygon points="2,15 28,28 28,56 2,43" fill="#ee5253" stroke="#d63031" stroke-width="2.5" stroke-linejoin="round" />
          
          <polygon points="28,28 54,15 54,43 28,56" fill="#c0392b" stroke="#d63031" stroke-width="2.5" stroke-linejoin="round" />
        </g>
      </svg>
      <div class="caption">On Hand</div>
    </div>

    
    <div class="spot-card">
      <div class="badge">
        <span class="badge-icon">✓</span> Same Shape!
      </div>
      <svg class="scene-svg" viewBox="0 0 140 130" xmlns="http://www.w3.org/2000/svg">
        
        <g id="table">
          <ellipse cx="70" cy="98" rx="60" ry="18" fill="#e2e8f0" />
          <path d="M 12 96 C 12 90, 128 90, 128 96 L 124 104 C 124 110, 16 110, 16 104 Z" fill="#cbd5e1" stroke="#94a3b8" stroke-width="3" />
          <ellipse cx="70" cy="95" rx="56" ry="14" fill="#f1f5f9" stroke="#94a3b8" stroke-width="3" />
        </g>
        
        <g transform="translate(42, 45)">
          
          <polygon points="28,2 54,15 28,28 2,15" fill="#ff7675" stroke="#d63031" stroke-width="2.5" stroke-linejoin="round" />
          
          <polygon points="2,15 28,28 28,56 2,43" fill="#ee5253" stroke="#d63031" stroke-width="2.5" stroke-linejoin="round" />
          
          <polygon points="28,28 54,15 54,43 28,56" fill="#c0392b" stroke="#d63031" stroke-width="2.5" stroke-linejoin="round" />
        </g>
      </svg>
      <div class="caption">On Table</div>
    </div>

    
    <div class="spot-card">
      <div class="badge">
        <span class="badge-icon">✓</span> Same Shape!
      </div>
      <svg class="scene-svg" viewBox="0 0 140 130" xmlns="http://www.w3.org/2000/svg">
        
        <ellipse cx="70" cy="62" rx="50" ry="14" fill="#e0f2fe" stroke="#38bdf8" stroke-width="2.5" opacity="0.6" />
        
        
        <g transform="translate(42, 42)">
          
          <polygon points="28,2 54,15 28,28 2,15" fill="#ff7675" stroke="#d63031" stroke-width="2.5" stroke-linejoin="round" />
          
          <polygon points="2,15 28,28 28,56 2,43" fill="#ee5253" stroke="#d63031" stroke-width="2.5" stroke-linejoin="round" />
          
          <polygon points="28,28 54,15 54,43 28,56" fill="#c0392b" stroke="#d63031" stroke-width="2.5" stroke-linejoin="round" />
        </g>

        
        <path d="M 20 62 C 20 110, 120 110, 120 62" fill="rgba(224, 242, 254, 0.45)" stroke="#38bdf8" stroke-width="3" stroke-linecap="round" />
        
        <path d="M 20 62 C 20 72, 120 72, 120 62" fill="none" stroke="#38bdf8" stroke-width="3" />
        
        <path d="M 32 75 C 36 96, 52 104, 60 106" fill="none" stroke="#ffffff" stroke-width="3" stroke-linecap="round" opacity="0.8" />
      </svg>
      <div class="caption">In Bowl</div>
    </div>
  </div>

</body>
</html>

OGM.1.STEM.5

Aligned learning resources

Related diagrams