<!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: #ffffff;
      color: #0f172a;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      min-height: 100%;
    }

    .header-row {
      display: flex;
      gap: 8px;
      margin-bottom: 12px;
      width: 100%;
      max-width: 560px;
    }

    .step-btn {
      flex: 1;
      padding: 8px 4px;
      font-size: 13px;
      font-weight: 700;
      border: 2px solid #cbd5e1;
      border-radius: 8px;
      background: #f8fafc;
      color: #334155;
      cursor: pointer;
      text-align: center;
      transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    }

    .step-btn:hover {
      background: #f1f5f9;
      border-color: #94a3b8;
    }

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

    .stage-container {
      display: flex;
      gap: 12px;
      width: 100%;
      max-width: 560px;
      justify-content: center;
    }

    .column {
      flex: 1;
      min-width: 0;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 12px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
    }

    .col-title {
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 6px;
      color: #0f172a;
      text-align: center;
    }

    .col-subtitle {
      font-size: 12px;
      font-weight: 600;
      color: #64748b;
      margin-bottom: 8px;
      text-align: center;
    }

    .canvas-box {
      width: 100%;
      height: 160px;
      position: relative;
    }

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

    .badge {
      margin-top: 10px;
      padding: 6px 10px;
      border-radius: 8px;
      font-size: 12px;
      font-weight: 700;
      text-align: center;
      line-height: 1.3;
      min-height: 42px;
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      transform: translateY(4px);
      transition: opacity 0.3s ease, transform 0.3s ease;
      width: 100%;
    }

    .badge.visible {
      opacity: 1;
      transform: translateY(0);
    }

    .badge-success {
      background: #dcfce7;
      color: #14532d;
      border: 1.5px solid #86efac;
    }

    .badge-danger {
      background: #fee2e2;
      color: #7f1d1d;
      border: 1.5px solid #fca5a5;
    }

    .controls {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      margin-top: 12px;
    }

    .btn-play, .btn-reset {
      padding: 8px 18px;
      font-size: 13px;
      font-weight: 700;
      border-radius: 8px;
      cursor: pointer;
      border: none;
      transition: opacity 0.2s ease, background-color 0.2s ease;
    }

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

    .btn-play:hover {
      background: #0369a1;
    }

    .btn-reset {
      background: #e2e8f0;
      color: #0f172a;
    }

    .btn-reset:hover {
      background: #cbd5e1;
    }

    @media (max-width: 400px) {
      .header-row {
        gap: 4px;
      }
      .step-btn {
        font-size: 11px;
        padding: 6px 2px;
      }
      .col-title {
        font-size: 13px;
      }
      .badge {
        font-size: 11px;
        padding: 4px 6px;
      }
    }
  </style>
</head>
<body>

  <div class="header-row">
    <button class="step-btn active" id="step-0-btn" onclick="setStep(0)">1. Rest</button>
    <button class="step-btn" id="step-1-btn" onclick="setStep(1)">2. Push Down</button>
    <button class="step-btn" id="step-2-btn" onclick="setStep(2)">3. Release / Snap</button>
  </div>

  <div class="stage-container">
    
    <div class="column">
      <div class="col-title">Rubber Ruler</div>
      <div class="col-subtitle">Flexible Material</div>
      <div class="canvas-box">
        <svg viewBox="0 0 200 150">
          
          <rect x="20" y="85" width="28" height="55" rx="3" fill="#94a3b8" />
          <rect x="152" y="85" width="28" height="55" rx="3" fill="#94a3b8" />
          
          
          <path id="rubber-path" d="M 30 85 Q 100 85 170 85" stroke="#f59e0b" stroke-width="11" stroke-linecap="round" fill="none" />
          
          
          <g id="rubber-marks" opacity="0.6">
            <line x1="60" y1="82" x2="60" y2="88" stroke="#78350f" stroke-width="2"/>
            <line x1="80" y1="82" x2="80" y2="88" stroke="#78350f" stroke-width="2"/>
            <line x1="100" y1="82" x2="100" y2="88" stroke="#78350f" stroke-width="2"/>
            <line x1="120" y1="82" x2="120" y2="88" stroke="#78350f" stroke-width="2"/>
            <line x1="140" y1="82" x2="140" y2="88" stroke="#78350f" stroke-width="2"/>
          </g>

          
          <g id="rubber-finger" transform="translate(100, 25)">
            <text x="0" y="0" font-size="28" text-anchor="middle" dominant-baseline="central">👇</text>
          </g>
        </svg>
      </div>
      <div id="rubber-badge" class="badge badge-success">✓ Bends &amp; springs back!<br>Flexible</div>
    </div>

    
    <div class="column">
      <div class="col-title">Glass Rod</div>
      <div class="col-subtitle">Brittle Material</div>
      <div class="canvas-box">
        <svg viewBox="0 0 200 150">
          
          <rect x="20" y="85" width="28" height="55" rx="3" fill="#94a3b8" />
          <rect x="152" y="85" width="28" height="55" rx="3" fill="#94a3b8" />
          
          
          <line id="glass-intact" x1="30" y1="85" x2="170" y2="85" stroke="#38bdf8" stroke-width="11" stroke-linecap="round" />
          
          
          <line id="glass-left" x1="30" y1="85" x2="96" y2="85" stroke="#38bdf8" stroke-width="11" stroke-linecap="round" opacity="0" />
          
          <line id="glass-right" x1="104" y1="85" x2="170" y2="85" stroke="#38bdf8" stroke-width="11" stroke-linecap="round" opacity="0" />

          
          <g id="glass-crack" opacity="0" transform="translate(100, 85)">
            <path d="M 0,-8 L -3,-2 L 3,2 L 0,8" stroke="#dc2626" stroke-width="3" fill="none" stroke-linecap="round" stroke-linejoin="round"/>
          </g>
          
          
          <g id="glass-finger" transform="translate(100, 25)">
            <text x="0" y="0" font-size="28" text-anchor="middle" dominant-baseline="central">👇</text>
          </g>
        </svg>
      </div>
      <div id="glass-badge" class="badge badge-danger">✕ Snaps!<br>Rigid and brittle</div>
    </div>
  </div>

  <div class="controls">
    <button id="playBtn" class="btn-play" onclick="toggleAuto()">⏸ Pause</button>
    <button id="resetBtn" class="btn-reset" onclick="resetToStart()">↺ Reset</button>
  </div>

  <script>
    let currentStep = 0;
    let autoInterval = null;
    let isPlaying = true;
    let animFrameId = null;

    const rubberPath = document.getElementById('rubber-path');
    const rubberMarks = document.getElementById('rubber-marks');
    const rubberFinger = document.getElementById('rubber-finger');
    const rubberBadge = document.getElementById('rubber-badge');

    const glassIntact = document.getElementById('glass-intact');
    const glassLeft = document.getElementById('glass-left');
    const glassRight = document.getElementById('glass-right');
    const glassCrack = document.getElementById('glass-crack');
    const glassFinger = document.getElementById('glass-finger');
    const glassBadge = document.getElementById('glass-badge');

    const stepBtns = [
      document.getElementById('step-0-btn'),
      document.getElementById('step-1-btn'),
      document.getElementById('step-2-btn')
    ];

    // Current visual state
    let state = {
      rubberMidY: 85,
      rubberFingerY: 25,
      glassFingerY: 25,
      glassLeftY2: 85,
      glassRightY1: 85,
      glassIntactOp: 1,
      glassBrokenOp: 0,
      glassCrackOp: 0
    };

    function easeOutQuad(t) {
      return t * (2 - t);
    }

    function easeOutBounce(t) {
      const n1 = 7.5625;
      const d1 = 2.75;
      if (t < 1 / d1) {
        return n1 * t * t;
      } else if (t < 2 / d1) {
        return n1 * (t -= 1.5 / d1) * t + 0.75;
      } else if (t < 2.5 / d1) {
        return n1 * (t -= 2.25 / d1) * t + 0.9375;
      } else {
        return n1 * (t -= 2.625 / d1) * t + 0.984375;
      }
    }

    function animateTo(target, duration = 400, easeFn = easeOutQuad) {
      if (animFrameId) cancelAnimationFrame(animFrameId);
      const startState = { ...state };
      const startTime = performance.now();

      function tick(now) {
        const elapsed = now - startTime;
        const progress = Math.min(1, elapsed / duration);
        const eased = easeFn(progress);

        for (let key in target) {
          state[key] = startState[key] + (target[key] - startState[key]) * eased;
        }

        applyState();

        if (progress < 1) {
          animFrameId = requestAnimationFrame(tick);
        }
      }

      animFrameId = requestAnimationFrame(tick);
    }

    function applyState() {
      // Rubber ruler
      rubberPath.setAttribute('d', `M 30 85 Q 100 ${state.rubberMidY} 170 85`);
      rubberFinger.setAttribute('transform', `translate(100, ${state.rubberFingerY})`);
      rubberMarks.setAttribute('opacity', Math.max(0, 0.6 - (state.rubberMidY - 85) * 0.01));

      // Glass rod
      glassFinger.setAttribute('transform', `translate(100, ${state.glassFingerY})`);
      glassIntact.setAttribute('opacity', state.glassIntactOp);
      glassCrack.setAttribute('opacity', state.glassCrackOp);
      glassLeft.setAttribute('opacity', state.glassBrokenOp);
      glassRight.setAttribute('opacity', state.glassBrokenOp);

      glassLeft.setAttribute('y2', state.glassLeftY2);
      glassRight.setAttribute('y1', state.glassRightY1);
    }

    function renderStep(step) {
      stepBtns.forEach((btn, idx) => {
        btn.classList.toggle('active', idx === step);
      });

      if (step === 0) {
        // 1. Rest state
        animateTo({
          rubberMidY: 85,
          rubberFingerY: 25,
          glassFingerY: 25,
          glassLeftY2: 85,
          glassRightY1: 85,
          glassIntactOp: 1,
          glassBrokenOp: 0,
          glassCrackOp: 0
        }, 350);
        rubberBadge.classList.remove('visible');
        glassBadge.classList.remove('visible');

      } else if (step === 1) {
        // 2. Push down
        animateTo({
          rubberMidY: 130,
          rubberFingerY: 70,
          glassFingerY: 60,
          glassLeftY2: 85,
          glassRightY1: 85,
          glassIntactOp: 1,
          glassBrokenOp: 0,
          glassCrackOp: 1
        }, 450);
        rubberBadge.classList.add('visible');
        rubberBadge.innerHTML = '✓ Flexible:<br>Bends under force';
        glassBadge.classList.remove('visible');

      } else if (step === 2) {
        // 3. Release & Snap
        animateTo({
          rubberMidY: 85,
          rubberFingerY: 20,
          glassFingerY: 80,
          glassLeftY2: 120,
          glassRightY1: 120,
          glassIntactOp: 0,
          glassBrokenOp: 1,
          glassCrackOp: 0
        }, 400, easeOutBounce);
        rubberBadge.classList.add('visible');
        rubberBadge.innerHTML = '✓ Bends &amp; springs back!<br>Flexible';
        glassBadge.classList.add('visible');
      }
    }

    function setStep(step) {
      currentStep = step;
      renderStep(currentStep);
    }

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

    function startAuto() {
      if (autoInterval) clearInterval(autoInterval);
      autoInterval = setInterval(nextStep, 2400);
      isPlaying = true;
      document.getElementById('playBtn').textContent = '⏸ Pause';
    }

    function stopAuto() {
      if (autoInterval) clearInterval(autoInterval);
      autoInterval = null;
      isPlaying = false;
      document.getElementById('playBtn').textContent = '▶ Play';
    }

    function toggleAuto() {
      if (isPlaying) {
        stopAuto();
      } else {
        nextStep();
        startAuto();
      }
    }

    function resetToStart() {
      stopAuto();
      setStep(0);
    }

    // Initial run
    applyState();
    renderStep(0);
    startAuto();
  </script>
</body>
</html>

Matching Material Properties to Everyday Uses

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Material Tensile Strength Test</title>
  <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;
      padding: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      min-height: 100%;
    }

    .main-wrap {
      width: 100%;
      max-width: 440px;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    /* Material Selector Tabs */
    .tabs {
      display: flex;
      gap: 6px;
      width: 100%;
    }
    .tab {
      flex: 1;
      padding: 8px 4px;
      font-size: 13px;
      font-weight: 700;
      text-align: center;
      background: #ffffff;
      border: 2px solid #cbd5e1;
      border-radius: 8px;
      cursor: pointer;
      color: #475569;
      transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
      user-select: none;
    }
    .tab:hover {
      border-color: #94a3b8;
    }
    .tab.active {
      background: #0284c7;
      border-color: #0369a1;
      color: #ffffff;
      box-shadow: 0 2px 5px rgba(2, 132, 199, 0.3);
    }

    /* Testing Rig Frame */
    .rig-container {
      width: 100%;
      height: 330px;
      position: relative;
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 12px;
      overflow: hidden;
    }

    /* Beam & Top Anchor */
    .beam {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 24px;
      background: #334155;
      border-bottom: 3px solid #1e293b;
      z-index: 2;
    }
    .beam-anchor {
      position: absolute;
      top: 24px;
      left: 50%;
      transform: translateX(-50%);
      width: 22px;
      height: 10px;
      background: #64748b;
      border: 1px solid #475569;
      border-top: none;
      border-radius: 0 0 4px 4px;
      z-index: 2;
    }

    /* Status Badge */
    .result-badge {
      position: absolute;
      top: 32px;
      left: 10px;
      padding: 5px 9px;
      border-radius: 6px;
      font-size: 11px;
      font-weight: 800;
      letter-spacing: 0.3px;
      z-index: 3;
      box-shadow: 0 1px 3px rgba(0,0,0,0.06);
    }
    .result-badge.safe {
      background: #dcfce7;
      color: #15803d;
      border: 1px solid #86efac;
    }
    .result-badge.snap {
      background: #fee2e2;
      color: #b91c1c;
      border: 1px solid #fca5a5;
    }

    /* Strain Meter */
    .gauge-wrap {
      position: absolute;
      top: 32px;
      right: 10px;
      width: 82px;
      background: #f8fafc;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      padding: 5px 6px;
      text-align: center;
      z-index: 3;
      box-shadow: 0 1px 3px rgba(0,0,0,0.06);
    }
    .gauge-title {
      font-size: 10px;
      font-weight: 700;
      text-transform: uppercase;
      color: #64748b;
      letter-spacing: 0.5px;
      line-height: 1.1;
    }
    .gauge-bar-bg {
      width: 100%;
      height: 7px;
      background: #e2e8f0;
      border-radius: 4px;
      margin: 4px 0;
      overflow: hidden;
    }
    .gauge-bar-fill {
      height: 100%;
      width: 10%;
      background: #22c55e;
      transition: width 0.25s ease, background-color 0.25s ease;
    }
    .gauge-status {
      font-size: 11px;
      font-weight: 800;
      color: #16a34a;
      line-height: 1;
    }

    /* Cable & Snapped Graphics SVG */
    .rig-svg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: 1;
    }

    /* Hanging Platform & Weights Stack */
    .platform-unit {
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      flex-direction: column-reverse;
      align-items: center;
      transition: top 0.3s cubic-bezier(0.34, 1.3, 0.64, 1);
      z-index: 2;
    }
    .platform-base {
      width: 124px;
      height: 11px;
      background: #475569;
      border-radius: 3px;
      border-bottom: 3px solid #1e293b;
      position: relative;
    }
    .platform-base::after {
      content: '';
      position: absolute;
      top: -6px;
      left: 50%;
      transform: translateX(-50%);
      width: 10px;
      height: 6px;
      border: 2px solid #475569;
      border-bottom: none;
      border-radius: 4px 4px 0 0;
    }

    .weights-stack {
      display: flex;
      flex-direction: column-reverse;
      align-items: center;
      gap: 2px;
      margin-bottom: 2px;
    }
    .weight-block {
      width: 96px;
      height: 14px;
      background: #1e293b;
      border: 1px solid #0f172a;
      border-radius: 3px;
      font-size: 10px;
      font-weight: 800;
      color: #ffffff;
      letter-spacing: 0.4px;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: inset 0 1px 0 rgba(255,255,255,0.15), 0 1px 2px rgba(0,0,0,0.2);
    }

    /* Floor & Ground */
    .floor {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 20px;
      background: #e2e8f0;
      border-top: 3px solid #cbd5e1;
      z-index: 2;
    }

    /* Bottom Controls */
    .controls {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      gap: 8px;
    }
    .btn-ctrl {
      flex: 0 0 auto;
      background: #ffffff;
      border: 1.5px solid #cbd5e1;
      border-radius: 8px;
      padding: 8px 14px;
      font-size: 13px;
      font-weight: 800;
      color: #0f172a;
      cursor: pointer;
      user-select: none;
      transition: background-color 0.1s, border-color 0.1s;
    }
    .btn-ctrl:hover {
      background: #f1f5f9;
      border-color: #94a3b8;
    }
    .btn-ctrl:active {
      background: #e2e8f0;
    }
    .load-text {
      flex: 1;
      font-size: 13px;
      font-weight: 800;
      color: #0f172a;
      text-align: center;
      white-space: nowrap;
    }
  </style>
</head>
<body>

  <div class="main-wrap">
    
    <div class="tabs">
      <div class="tab active" onclick="setMaterial(0)">🧵 Cotton</div>
      <div class="tab" onclick="setMaterial(1)">🪢 Nylon</div>
      <div class="tab" onclick="setMaterial(2)">⛓️ Steel</div>
    </div>

    
    <div class="rig-container">
      <div class="beam"></div>
      <div class="beam-anchor"></div>

      <div id="badge" class="result-badge safe">✓ HOLDS SAFE</div>

      <div class="gauge-wrap">
        <div class="gauge-title">Strain</div>
        <div class="gauge-bar-bg">
          <div id="gaugeBar" class="gauge-bar-fill"></div>
        </div>
        <div id="gaugeText" class="gauge-status">SAFE</div>
      </div>

      
      <svg class="rig-svg" viewBox="0 0 400 330" preserveAspectRatio="none">
        
        <line id="cable" x1="200" y1="34" x2="200" y2="120" stroke="#94a3b8" stroke-width="4" stroke-linecap="round" />
        
        
        <g id="snapVisual" opacity="0">
          <path d="M 194 48 L 205 53 L 195 59 L 206 65 L 198 71" stroke="#dc2626" stroke-width="3.5" fill="none" stroke-linecap="round" stroke-linejoin="round" />
          <circle cx="200" cy="46" r="3" fill="#ef4444" />
          <circle cx="198" cy="73" r="3" fill="#ef4444" />
        </g>
      </svg>

      
      <div id="platformUnit" class="platform-unit" style="top: 120px;">
        <div class="platform-base"></div>
        <div id="weightsStack" class="weights-stack"></div>
      </div>

      <div class="floor"></div>
    </div>

    
    <div class="controls">
      <button class="btn-ctrl" onclick="changeLoad(-1)">− 100 lb</button>
      <div class="load-text" id="loadLabel">100 lbs (1 block)</div>
      <button class="btn-ctrl" onclick="changeLoad(1)">+ 100 lb</button>
    </div>
  </div>

  <script>
    const materials = [
      { name: "Cotton", snapLoad: 1, stroke: "#cbd5e1", width: 3 },
      { name: "Nylon",  snapLoad: 5, stroke: "#38bdf8", width: 4.5 },
      { name: "Steel",  snapLoad: 99, stroke: "#475569", width: 5.5 }
    ];

    let currentMat = 0;
    let currentBlocks = 1;

    function setMaterial(idx) {
      currentMat = idx;
      document.querySelectorAll('.tab').forEach((t, i) => {
        t.classList.toggle('active', i === idx);
      });
      // Set typical demonstration load
      if (idx === 0) currentBlocks = 1;
      else if (idx === 1) currentBlocks = 5;
      else currentBlocks = 10;
      updateSimulation();
    }

    function changeLoad(delta) {
      currentBlocks = Math.max(1, Math.min(10, currentBlocks + delta));
      updateSimulation();
    }

    function updateSimulation() {
      const mat = materials[currentMat];
      const isSnapped = currentBlocks >= mat.snapLoad;
      const totalWeight = currentBlocks * 100;

      // Update text label
      document.getElementById('loadLabel').textContent = `${totalWeight.toLocaleString()} lbs (${currentBlocks} ${currentBlocks === 1 ? 'block' : 'blocks'})`;

      // Render weight blocks
      const stack = document.getElementById('weightsStack');
      stack.innerHTML = '';
      for (let i = 0; i < currentBlocks; i++) {
        const blk = document.createElement('div');
        blk.className = 'weight-block';
        blk.textContent = '100 lb';
        stack.appendChild(blk);
      }

      const platform = document.getElementById('platformUnit');
      const cable = document.getElementById('cable');
      const snapVis = document.getElementById('snapVisual');
      const badge = document.getElementById('badge');
      const gaugeBar = document.getElementById('gaugeBar');
      const gaugeText = document.getElementById('gaugeText');

      // Cable appearance
      cable.setAttribute('stroke', mat.stroke);
      cable.setAttribute('stroke-width', mat.width);

      const blockHeight = 16; // 14px height + 2px gap
      const baseHeight = 14;  // platform base + loop
      const stackTotalHeight = currentBlocks * blockHeight + baseHeight;
      const floorY = 307;     // Top of floor surface (330 - 20 - padding offset)

      if (isSnapped) {
        // Platform rests solidly on the ground floor with all blocks fully visible
        const groundTop = floorY - stackTotalHeight;
        platform.style.top = `${groundTop}px`;

        // Cable snapped visual
        cable.setAttribute('y2', '46');
        snapVis.setAttribute('opacity', '1');

        // Status badge & gauge
        badge.className = 'result-badge snap';
        badge.textContent = '⚡ SNAPPED!';

        gaugeBar.style.width = '100%';
        gaugeBar.style.backgroundColor = '#ef4444';
        gaugeText.textContent = 'FAIL';
        gaugeText.style.color = '#dc2626';
      } else {
        // Suspended safely in air above the floor
        // Calculate safe resting position so even 10 blocks (160px) don't touch the floor
        const suspendedTop = Math.max(50, 275 - stackTotalHeight);
        platform.style.top = `${suspendedTop}px`;

        cable.setAttribute('y2', suspendedTop);
        snapVis.setAttribute('opacity', '0');

        badge.className = 'result-badge safe';
        badge.textContent = '✓ HOLDS SAFE';

        // Strain calculation
        let strainPercent = 0;
        if (mat.snapLoad === 99) {
          // Steel stays safely in green zone up to max test weight (10 blocks = 1,000 lbs)
          strainPercent = Math.round((currentBlocks / 10) * 35);
          gaugeBar.style.backgroundColor = '#22c55e';
          gaugeText.textContent = 'SAFE';
          gaugeText.style.color = '#16a34a';
        } else {
          strainPercent = Math.min(95, Math.round((currentBlocks / mat.snapLoad) * 90));
          gaugeBar.style.backgroundColor = '#f59e0b';
          gaugeText.textContent = 'HIGH';
          gaugeText.style.color = '#d97706';
        }

        gaugeBar.style.width = `${strainPercent}%`;
      }
    }

    // Initial load
    updateSimulation();
  </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>Glass Properties: Hardness vs. Brittleness</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      width: 100%;
      min-height: 100vh;
      background: #ffffff;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      color: #0f172a;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 16px;
      user-select: none;
    }

    .container {
      width: 100%;
      max-width: 480px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 16px;
    }

    /* Navigation / Tabs */
    .nav-tabs {
      display: flex;
      gap: 10px;
      width: 100%;
    }

    .tab-btn {
      flex: 1;
      padding: 10px 14px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 8px;
      border: 1.5px solid #cbd5e1;
      background: #f8fafc;
      color: #475569;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
    }

    .tab-btn:hover {
      background: #f1f5f9;
      border-color: #94a3b8;
    }

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

    /* Stage Area - Clean canvas without rounded card shell */
    .stage {
      position: relative;
      width: 100%;
      height: 230px;
      overflow: hidden;
    }

    .scene {
      position: absolute;
      inset: 0;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.25s ease;
    }

    .scene.active {
      opacity: 1;
      pointer-events: auto;
    }

    /* Glass Pane Component */
    .glass-pane {
      position: absolute;
      left: 10%;
      width: 80%;
      height: 44px;
      bottom: 66px;
      background: linear-gradient(180deg, rgba(224, 242, 254, 0.95) 0%, rgba(186, 230, 253, 0.65) 100%);
      border: 2px solid #0284c7;
      border-radius: 4px;
      box-shadow: 0 4px 14px rgba(2, 132, 199, 0.15);
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .glass-label {
      position: absolute;
      bottom: -22px;
      left: 0;
      width: 100%;
      text-align: center;
      font-size: 12px;
      font-weight: 700;
      color: #0369a1;
      letter-spacing: 0.6px;
      text-transform: uppercase;
    }

    /* Scene 1: Scratch Test */
    .coin {
      position: absolute;
      width: 36px;
      height: 36px;
      font-size: 30px;
      line-height: 36px;
      text-align: center;
      bottom: 106px;
      left: 14%;
    }

    .scene-scratch.running .coin {
      animation: dragCoin 3s ease-in-out infinite;
    }

    .drag-indicator {
      position: absolute;
      bottom: 120px;
      left: 22%;
      width: 56%;
      height: 2px;
      background: dashed 2px #94a3b8;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .drag-indicator::before,
    .drag-indicator::after {
      content: '';
      width: 6px;
      height: 6px;
      background: #64748b;
      border-radius: 50%;
    }

    @keyframes dragCoin {
      0%, 15% { left: 14%; }
      50%, 75% { left: 76%; }
      95%, 100% { left: 14%; }
    }

    /* Scene 2: Impact Test */
    .ball {
      position: absolute;
      width: 34px;
      height: 34px;
      font-size: 30px;
      line-height: 34px;
      text-align: center;
      top: 10px;
      left: calc(50% - 17px);
    }

    .scene-impact.running .ball {
      animation: dropBall 3s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    }

    .cracks {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      opacity: 0;
      pointer-events: none;
    }

    .scene-impact.running .cracks {
      animation: showCracks 3s step-end infinite;
    }

    .shatter-particles {
      position: absolute;
      left: 50%;
      bottom: 88px;
      width: 10px;
      height: 10px;
      pointer-events: none;
      opacity: 0;
    }

    .scene-impact.running .shatter-particles {
      animation: showParticles 3s ease-out infinite;
    }

    .particle {
      position: absolute;
      width: 5px;
      height: 5px;
      background: #7dd3fc;
      border: 1px solid #0284c7;
      border-radius: 1px;
    }

    .p1 { transform: translate(-28px, -24px) rotate(25deg); }
    .p2 { transform: translate(26px, -28px) rotate(-35deg); }
    .p3 { transform: translate(-38px, -8px) rotate(45deg); }
    .p4 { transform: translate(36px, -12px) rotate(-20deg); }

    @keyframes dropBall {
      0%, 10% { top: 10px; }
      38% { top: 78px; }
      46% { top: 62px; }
      54%, 82% { top: 78px; }
      92%, 100% { top: 10px; }
    }

    @keyframes showCracks {
      0%, 37% { opacity: 0; }
      38%, 82% { opacity: 1; }
      83%, 100% { opacity: 0; }
    }

    @keyframes showParticles {
      0%, 37% { opacity: 0; transform: scale(0.5); }
      38% { opacity: 1; transform: scale(1); }
      48%, 82% { opacity: 0.8; transform: scale(1.2); }
      83%, 100% { opacity: 0; transform: scale(0.5); }
    }

    /* Result Banner */
    .result-badge {
      position: absolute;
      bottom: 4px;
      left: 50%;
      transform: translateX(-50%);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 13.5px;
      font-weight: 600;
      white-space: nowrap;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .result-badge strong {
      font-weight: 800;
    }

    .badge-hard {
      background: #ecfdf5;
      color: #065f46;
      border: 1.5px solid #6ee7b7;
    }

    .badge-brittle {
      background: #fef2f2;
      color: #991b1b;
      border: 1.5px solid #fca5a5;
    }

    @media (max-width: 400px) {
      .tab-btn {
        font-size: 13px;
        padding: 8px 10px;
      }
      .result-badge {
        font-size: 12px;
        padding: 6px 12px;
      }
    }
  </style>
</head>
<body>

  <div class="container">
    
    <div class="nav-tabs">
      <button class="tab-btn active" id="btnScratch" onclick="showScene('scratch')">
        🪙 Test 1: Scratch Test
      </button>
      <button class="tab-btn" id="btnImpact" onclick="showScene('impact')">
        ⚾ Test 2: Impact Test
      </button>
    </div>

    
    <div class="stage">
      
      <div class="scene scene-scratch active running" id="sceneScratch">
        <div class="drag-indicator"></div>
        <div class="coin" title="Coin scraping across glass">🪙</div>
        <div class="glass-pane">
          <div class="glass-label">Glass Pane (Smooth & Unmarked)</div>
        </div>
        <div class="result-badge badge-hard">
          <strong>Very Hard!</strong> Resists scratches.
        </div>
      </div>

      
      <div class="scene scene-impact" id="sceneImpact">
        <div class="ball" title="Dropped Baseball">⚾</div>
        <div class="shatter-particles">
          <div class="particle p1"></div>
          <div class="particle p2"></div>
          <div class="particle p3"></div>
          <div class="particle p4"></div>
        </div>
        <div class="glass-pane">
          <svg class="cracks" viewBox="0 0 380 44" preserveAspectRatio="none">
            
            <line x1="190" y1="0" x2="190" y2="44" stroke="#0369a1" stroke-width="2.5"/>
            <line x1="190" y1="20" x2="110" y2="6" stroke="#0369a1" stroke-width="2"/>
            <line x1="190" y1="20" x2="270" y2="36" stroke="#0369a1" stroke-width="2"/>
            <line x1="190" y1="20" x2="240" y2="6" stroke="#0369a1" stroke-width="2"/>
            <line x1="190" y1="20" x2="140" y2="38" stroke="#0369a1" stroke-width="2"/>
            <line x1="110" y1="6" x2="50" y2="24" stroke="#0369a1" stroke-width="1.5"/>
            <line x1="270" y1="36" x2="330" y2="12" stroke="#0369a1" stroke-width="1.5"/>
            <line x1="190" y1="0" x2="170" y2="16" stroke="#0369a1" stroke-width="1.5"/>
            <line x1="190" y1="0" x2="210" y2="14" stroke="#0369a1" stroke-width="1.5"/>
          </svg>
          <div class="glass-label">Glass Pane (Shattered)</div>
        </div>
        <div class="result-badge badge-brittle">
          <strong>Brittle!</strong> Low impact strength.
        </div>
      </div>
    </div>
  </div>

  <script>
    function showScene(type) {
      const isScratch = type === 'scratch';
      
      document.getElementById('btnScratch').classList.toggle('active', isScratch);
      document.getElementById('btnImpact').classList.toggle('active', !isScratch);
      
      const scratchScene = document.getElementById('sceneScratch');
      const impactScene = document.getElementById('sceneImpact');
      
      // Cleanly reset animations on tab change
      scratchScene.classList.remove('running', 'active');
      impactScene.classList.remove('running', 'active');
      
      void scratchScene.offsetWidth; // Force DOM reflow
      
      if (isScratch) {
        scratchScene.classList.add('active', 'running');
      } else {
        impactScene.classList.add('active', 'running');
      }
    }
  </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: space-between;
      padding: 12px;
      min-height: 100%;
      user-select: none;
    }

    /* Hotspot Navigation Tabs */
    .tabs {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      justify-content: center;
      width: 100%;
      max-width: 480px;
    }

    .tab-btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 6px 12px;
      font-size: 13px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 5px;
      transition: background-color 0.2s, color 0.2s, box-shadow 0.2s;
    }

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

    /* Skateboard Display Area */
    .viewport {
      position: relative;
      width: 100%;
      max-width: 460px;
      height: 190px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

    /* SVG Part Highlights */
    .part {
      cursor: pointer;
      transition: filter 0.2s, opacity 0.2s, stroke-width 0.2s;
    }

    .part:hover {
      filter: brightness(1.1);
    }

    .part.dimmed {
      opacity: 0.35;
    }

    .part.highlighted {
      opacity: 1;
      filter: drop-shadow(0 0 6px rgba(2, 132, 199, 0.7));
    }

    /* Hotspot indicator rings */
    .hotspot {
      cursor: pointer;
    }

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

    @keyframes pulse {
      0% { r: 8px; opacity: 0.8; }
      100% { r: 18px; opacity: 0; }
    }

    /* Info Callout Box */
    .info-box {
      width: 100%;
      max-width: 460px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      padding: 10px 14px;
      display: flex;
      flex-direction: column;
      gap: 4px;
      min-height: 74px;
      justify-content: center;
    }

    .info-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

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

    .material-tag {
      font-size: 11px;
      font-weight: 600;
      background: #e0f2fe;
      color: #0369a1;
      padding: 2px 8px;
      border-radius: 12px;
    }

    .property-desc {
      font-size: 13px;
      color: #334155;
      line-height: 1.35;
    }
  </style>
</head>
<body>

  
  <div class="tabs">
    <button class="tab-btn active" data-part="0">🛹 Deck</button>
    <button class="tab-btn" data-part="1">🔩 Trucks</button>
    <button class="tab-btn" data-part="2">🛞 Wheels</button>
    <button class="tab-btn" data-part="3">⚙️ Bearings</button>
  </div>

  
  <div class="viewport">
    <svg viewBox="0 0 460 190" xmlns="http://www.w3.org/2000/svg">
      
      <defs>
        <linearGradient id="deckWood" x1="0%" y1="0%" x2="0%" y2="100%">
          <stop offset="0%" stop-color="#b45309" />
          <stop offset="40%" stop-color="#d97706" />
          <stop offset="100%" stop-color="#92400e" />
        </linearGradient>
        <linearGradient id="metalTruck" x1="0%" y1="0%" x2="100%" y2="100%">
          <stop offset="0%" stop-color="#cbd5e1" />
          <stop offset="50%" stop-color="#94a3b8" />
          <stop offset="100%" stop-color="#64748b" />
        </linearGradient>
        <radialGradient id="wheelRubber" cx="50%" cy="50%" r="50%">
          <stop offset="0%" stop-color="#38bdf8" />
          <stop offset="75%" stop-color="#0284c7" />
          <stop offset="100%" stop-color="#0369a1" />
        </radialGradient>
        <radialGradient id="steelBearing" cx="50%" cy="50%" r="50%">
          <stop offset="0%" stop-color="#f8fafc" />
          <stop offset="50%" stop-color="#94a3b8" />
          <stop offset="100%" stop-color="#475569" />
        </radialGradient>
      </defs>

      
      <ellipse cx="230" cy="165" rx="180" ry="10" fill="#e2e8f0" />

      
      <g id="trucks-part" class="part">
        
        <polygon points="105,72 125,72 120,115 110,115" fill="url(#metalTruck)" stroke="#475569" stroke-width="1.5" />
        <rect x="90" y="108" width="50" height="10" rx="3" fill="#64748b" stroke="#334155" stroke-width="1.5" />
        
        <polygon points="335,72 355,72 350,115 340,115" fill="url(#metalTruck)" stroke="#475569" stroke-width="1.5" />
        <rect x="320" y="108" width="50" height="10" rx="3" fill="#64748b" stroke="#334155" stroke-width="1.5" />
      </g>

      
      <g id="wheels-part" class="part">
        
        <ellipse cx="115" cy="128" rx="26" ry="26" fill="url(#wheelRubber)" stroke="#0c4a6e" stroke-width="2" />
        
        <ellipse cx="345" cy="128" rx="26" ry="26" fill="url(#wheelRubber)" stroke="#0c4a6e" stroke-width="2" />
      </g>

      
      <g id="bearings-part" class="part">
        
        <circle cx="115" cy="128" r="11" fill="url(#steelBearing)" stroke="#1e293b" stroke-width="1.5" />
        <circle cx="115" cy="128" r="4" fill="#0f172a" />
        
        <circle cx="345" cy="128" r="11" fill="url(#steelBearing)" stroke="#1e293b" stroke-width="1.5" />
        <circle cx="345" cy="128" r="4" fill="#0f172a" />
      </g>

      
      <g id="deck-part" class="part">
        
        <path d="M 30,55 Q 60,68 110,68 L 350,68 Q 400,68 430,55 Q 436,65 395,74 L 65,74 Q 24,65 30,55 Z"
              fill="url(#deckWood)" stroke="#78350f" stroke-width="2" />
        
        <path d="M 30,55 Q 60,68 110,68 L 350,68 Q 400,68 430,55 Q 400,60 350,60 L 110,60 Q 60,60 30,55 Z"
              fill="#1e293b" opacity="0.9" />
      </g>

      
      
      <g class="hotspot" data-part="0" transform="translate(230, 66)">
        <circle class="pulse-ring" cx="0" cy="0" r="10" fill="none" stroke="#0284c7" stroke-width="2" />
        <circle cx="0" cy="0" r="7" fill="#0284c7" stroke="#ffffff" stroke-width="2" />
      </g>

      
      <g class="hotspot" data-part="1" transform="translate(345, 96)">
        <circle class="pulse-ring" cx="0" cy="0" r="10" fill="none" stroke="#0284c7" stroke-width="2" />
        <circle cx="0" cy="0" r="7" fill="#0284c7" stroke="#ffffff" stroke-width="2" />
      </g>

      
      <g class="hotspot" data-part="2" transform="translate(115, 142)">
        <circle class="pulse-ring" cx="0" cy="0" r="10" fill="none" stroke="#0284c7" stroke-width="2" />
        <circle cx="0" cy="0" r="7" fill="#0284c7" stroke="#ffffff" stroke-width="2" />
      </g>

      
      <g class="hotspot" data-part="3" transform="translate(345, 128)">
        <circle class="pulse-ring" cx="0" cy="0" r="10" fill="none" stroke="#0284c7" stroke-width="2" />
        <circle cx="0" cy="0" r="7" fill="#0284c7" stroke="#ffffff" stroke-width="2" />
      </g>
    </svg>
  </div>

  
  <div class="info-box">
    <div class="info-header">
      <span id="partTitle" class="info-title">1. Skateboard Deck</span>
      <span id="materialTag" class="material-tag">Maple Wood</span>
    </div>
    <div id="propDesc" class="property-desc">Strong & flexible to absorb impact during jumps.</div>
  </div>

  <script>
    const data = [
      {
        id: 'deck-part',
        title: '1. Skateboard Deck',
        material: 'Layered Maple Wood',
        desc: 'Strong & flexible to absorb shock and support jumps without snapping.'
      },
      {
        id: 'trucks-part',
        title: '2. Metal Trucks',
        material: 'Aluminium / Steel',
        desc: 'Rigid & high tensile strength to hold body weight without bending.'
      },
      {
        id: 'wheels-part',
        title: '3. Wheels',
        material: 'Polyurethane Rubber',
        desc: 'Flexible & shock-absorbing to provide smooth grip on rough roads.'
      },
      {
        id: 'bearings-part',
        title: '4. Precision Bearings',
        material: 'Hardened Steel',
        desc: 'Extremely hard & low-friction to resist wear at high rotational speeds.'
      }
    ];

    const tabButtons = document.querySelectorAll('.tab-btn');
    const svgParts = [
      document.getElementById('deck-part'),
      document.getElementById('trucks-part'),
      document.getElementById('wheels-part'),
      document.getElementById('bearings-part')
    ];
    const hotspots = document.querySelectorAll('.hotspot');
    const partTitle = document.getElementById('partTitle');
    const materialTag = document.getElementById('materialTag');
    const propDesc = document.getElementById('propDesc');

    function selectPart(index) {
      // Update buttons
      tabButtons.forEach((btn, i) => {
        btn.classList.toggle('active', i === index);
      });

      // Update SVG highlights
      svgParts.forEach((part, i) => {
        if (i === index) {
          part.classList.add('highlighted');
          part.classList.remove('dimmed');
        } else {
          part.classList.remove('highlighted');
          part.classList.add('dimmed');
        }
      });

      // Update Card
      const info = data[index];
      partTitle.textContent = info.title;
      materialTag.textContent = info.material;
      propDesc.textContent = info.desc;
    }

    // Attach click events
    tabButtons.forEach(btn => {
      btn.addEventListener('click', () => {
        selectPart(parseInt(btn.getAttribute('data-part'), 10));
      });
    });

    hotspots.forEach(hotspot => {
      hotspot.addEventListener('click', () => {
        selectPart(parseInt(hotspot.getAttribute('data-part'), 10));
      });
    });

    svgParts.forEach((part, i) => {
      part.addEventListener('click', () => selectPart(i));
    });

    // Initial state
    selectPart(0);
  </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;
      user-select: none;
    }

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

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

    .prop-card {
      background: #ffffff;
      border-radius: 12px;
      padding: 12px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      cursor: pointer;
      border: 2px solid transparent;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 0 0 1px #e2e8f0;
      transition: box-shadow 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
    }

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

    .prop-card.active {
      border-color: #22b7ff;
      box-shadow: 0 0 0 2px #22b7ff, 0 4px 12px rgba(34, 183, 255, 0.2);
      background: #f0f9ff;
    }

    .visual-box {
      width: 100%;
      height: 80px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 6px;
    }

    .title {
      font-size: 15px;
      font-weight: 700;
      color: #0f172a;
      letter-spacing: -0.2px;
    }

    .detail-panel {
      background: #ffffff;
      border-radius: 12px;
      padding: 14px 16px;
      border: 1px solid #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      min-height: 56px;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    }

    .def-tag {
      font-size: 11px;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      padding: 3px 8px;
      border-radius: 6px;
      background: #22b7ff;
      color: #ffffff;
      flex-shrink: 0;
    }

    .def-text {
      font-size: 15px;
      font-weight: 600;
      color: #1e2945;
    }

    svg {
      overflow: visible;
    }

    @media (max-width: 400px) {
      body { padding: 8px; gap: 8px; }
      .grid { gap: 6px; }
      .visual-box { height: 65px; }
      .title { font-size: 13px; }
      .def-text { font-size: 13px; }
      .def-tag { font-size: 10px; padding: 2px 6px; }
    }
  </style>
</head>
<body>

  <div class="grid">
    
    <div class="prop-card active" id="card-0" onclick="selectProperty(0)">
      <div class="visual-box">
        <svg width="74" height="64" viewBox="0 0 74 64">
          
          <rect x="8" y="32" width="58" height="26" rx="4" fill="#94a3b8" />
          <rect x="8" y="32" width="58" height="6" rx="2" fill="#cbd5e1" />
          
          <path d="M37 6 L47 22 L27 22 Z" fill="#38bdf8" stroke="#0284c7" stroke-width="1.5" />
          <polygon points="37,6 42,22 37,22" fill="#bae6fd" />
          
          <path d="M37 22 L37 32" stroke="#0284c7" stroke-width="2.5" stroke-linecap="round" />
          <path d="M32 29 L28 27 M42 29 L46 27" stroke="#f59e0b" stroke-width="2" stroke-linecap="round" />
        </svg>
      </div>
      <div class="title">Hardness</div>
    </div>

    
    <div class="prop-card" id="card-1" onclick="selectProperty(1)">
      <div class="visual-box">
        <svg width="74" height="64" viewBox="0 0 74 64">
          
          <path d="M12 48 Q37 14 62 48" fill="none" stroke="#e2e8f0" stroke-width="8" stroke-linecap="round" />
          
          <path d="M12 48 Q37 18 62 48" fill="none" stroke="#3b82f6" stroke-width="7" stroke-linecap="round" />
          
          <path d="M26 34 L24 38 M37 28 L37 33 M48 34 L50 38" stroke="#ffffff" stroke-width="1.5" />
          
          <path d="M37 14 L37 22 M33 18 L37 14 L41 18" fill="none" stroke="#0284c7" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
        </svg>
      </div>
      <div class="title">Flexibility</div>
    </div>

    
    <div class="prop-card" id="card-2" onclick="selectProperty(2)">
      <div class="visual-box">
        <svg width="74" height="64" viewBox="0 0 74 64">
          
          <rect x="22" y="4" width="30" height="5" rx="2" fill="#64748b" />
          
          <line x1="37" y1="9" x2="37" y2="28" stroke="#475569" stroke-width="3.5" stroke-dasharray="1 1" />
          
          <path d="M37 28 C37 32 32 32 32 35" fill="none" stroke="#334155" stroke-width="2" stroke-linecap="round" />
          
          <path d="M25 35 C25 31 49 31 49 35 L53 54 C53 57 21 57 21 54 Z" fill="#1e293b" />
          <text x="37" y="49" fill="#f8fafc" font-size="9" font-weight="900" text-anchor="middle" font-family="sans-serif">500 kg</text>
        </svg>
      </div>
      <div class="title">Strength</div>
    </div>
  </div>

  <div class="detail-panel">
    <div class="def-tag" id="defTag">Hardness</div>
    <div class="def-text" id="defText">Resists scratching</div>
  </div>

  <script>
    const properties = [
      { name: "Hardness", def: "Resists scratching" },
      { name: "Flexibility", def: "Bends without snapping" },
      { name: "Strength", def: "Holds heavy forces" }
    ];

    function selectProperty(idx) {
      for (let i = 0; i < 3; i++) {
        const card = document.getElementById('card-' + i);
        if (i === idx) {
          card.classList.add('active');
        } else {
          card.classList.remove('active');
        }
      }
      document.getElementById('defTag').textContent = properties[idx].name;
      document.getElementById('defText').textContent = properties[idx].def;
    }
  </script>
</body>
</html>

<!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;
    }

    html, body {
      height: auto;
      min-height: fit-content;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: transparent;
      color: #1e2945;
      padding: 8px;
      user-select: none;
    }

    .grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      width: 100%;
      max-width: 620px;
      margin: 0 auto;
      height: fit-content;
    }

    .column {
      border-radius: 12px;
      padding: 10px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .col-natural {
      background: #edf8f0;
      border: 1.5px solid #c3e6cb;
    }

    .col-synthetic {
      background: #fff4ea;
      border: 1.5px solid #fed7aa;
    }

    .col-header {
      font-size: 13px;
      font-weight: 700;
      text-align: center;
      padding: 5px 8px;
      border-radius: 8px;
      letter-spacing: -0.1px;
      text-transform: uppercase;
    }

    .col-natural .col-header {
      color: #1b5e20;
      background: #dbf0e0;
    }

    .col-synthetic .col-header {
      color: #9a3412;
      background: #ffe3cd;
    }

    .flow-card {
      background: #ffffff;
      border-radius: 10px;
      padding: 8px;
      display: flex;
      align-items: center;
      justify-content: space-evenly;
      gap: 4px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
      border: 1px solid rgba(0,0,0,0.06);
      transition: background-color 0.2s ease, box-shadow 0.2s ease;
      cursor: pointer;
    }

    .flow-card:active {
      background-color: #f8fafc;
      box-shadow: 0 0 0 2px #38bdf8;
    }

    .item {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
      flex: 1;
      min-width: 0;
    }

    .icon {
      font-size: 24px;
      line-height: 1.2;
      display: block;
    }

    .label {
      font-size: 12px;
      font-weight: 600;
      color: #374151;
      margin-top: 2px;
      white-space: nowrap;
    }

    .process-label {
      font-size: 10px;
      font-weight: 500;
      color: #6b7280;
    }

    .arrow {
      color: #9ca3af;
      font-size: 14px;
      font-weight: 700;
      flex-shrink: 0;
      user-select: none;
    }

    @media (max-width: 480px) {
      .grid {
        grid-template-columns: 1fr;
        gap: 10px;
      }

      .column {
        padding: 8px;
      }

      .flow-card {
        padding: 6px 4px;
      }

      .icon {
        font-size: 22px;
      }

      .label {
        font-size: 11px;
      }
    }
  </style>
</head>
<body>
  <div class="grid">
    
    <div class="column col-natural">
      <div class="col-header">Natural Materials</div>

      <div class="flow-card">
        <div class="item">
          <span class="icon">🌳</span>
          <span class="label">Tree</span>
        </div>
        <span class="arrow">→</span>
        <div class="item">
          <span class="icon">🪵</span>
          <span class="label">Wood</span>
        </div>
      </div>

      <div class="flow-card">
        <div class="item">
          <span class="icon">🌱</span>
          <span class="label">Cotton Plant</span>
        </div>
        <span class="arrow">→</span>
        <div class="item">
          <span class="icon">🧵</span>
          <span class="label">Cotton</span>
        </div>
      </div>

      <div class="flow-card">
        <div class="item">
          <span class="icon">🪨</span>
          <span class="label">Rock / Ore</span>
        </div>
        <span class="arrow">→</span>
        <div class="item">
          <span class="icon">🔩</span>
          <span class="label">Raw Metal</span>
        </div>
      </div>
    </div>

    
    <div class="column col-synthetic">
      <div class="col-header">Synthetic Materials</div>

      <div class="flow-card">
        <div class="item">
          <span class="icon">🛢️</span>
          <span class="label">Oil</span>
        </div>
        <span class="arrow">→</span>
        <div class="item">
          <span class="icon">🧪</span>
          <span class="label process-label">Chemicals</span>
        </div>
        <span class="arrow">→</span>
        <div class="item">
          <span class="icon">🥤</span>
          <span class="label">Plastic</span>
        </div>
      </div>

      <div class="flow-card">
        <div class="item">
          <span class="icon">🏖️</span>
          <span class="label">Sand</span>
        </div>
        <span class="arrow">→</span>
        <div class="item">
          <span class="icon">🔥</span>
          <span class="label process-label">Furnace</span>
        </div>
        <span class="arrow">→</span>
        <div class="item">
          <span class="icon">🪟</span>
          <span class="label">Glass</span>
        </div>
      </div>
    </div>
  </div>
</body>
</html>

science.ks3.y1.t3.s4

Aligned learning resources

Related diagrams