<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #ffffff;
      color: #1e2945;
      padding: 10px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .recipe-card {
      border: 1px solid #e6e6e6;
      border-radius: 12px;
      padding: 10px 12px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .brick-card {
      background-color: #fff5eb;
    }

    .concrete-card {
      background-color: #f0f4f8;
    }

    .recipe-title {
      font-size: 15px;
      font-weight: 700;
      letter-spacing: -0.2px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .brick-title {
      color: #9a3412;
    }

    .concrete-title {
      color: #334155;
    }

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

    .step {
      flex: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      gap: 4px;
      min-width: 0;
    }

    .step-img {
      width: 100%;
      max-width: 90px;
      height: 60px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .step-img svg {
      width: 100%;
      height: 100%;
      overflow: visible;
    }

    .label {
      font-size: 13px;
      font-weight: 600;
      color: #475569;
      white-space: nowrap;
    }

    .arrow {
      font-size: 18px;
      font-weight: bold;
      color: #94a3b8;
      padding: 0 4px;
      user-select: none;
      flex-shrink: 0;
    }
  </style>
</head>
<body>

  
  <div class="recipe-card brick-card">
    <div class="recipe-title brick-title">Brick Recipe</div>
    <div class="flow">
      
      <div class="step">
        <div class="step-img">
          <svg viewBox="0 0 100 70" fill="none">
            
            <polygon points="15,48 45,62 85,45 55,33" fill="#e2b17a" stroke="#c08a4f" stroke-width="2" />
            <polygon points="15,48 15,56 45,70 45,62" fill="#c08a4f" />
            <polygon points="45,70 85,53 85,45 45,62" fill="#9f6b32" />
            
            <ellipse cx="48" cy="42" rx="22" ry="11" fill="#8c5835" />
            <ellipse cx="46" cy="38" rx="15" ry="7" fill="#a46d44" />
            
            <path d="M 40 37 Q 48 35 54 39" stroke="#fed7aa" stroke-width="2" stroke-linecap="round" fill="none" />
          </svg>
        </div>
        <div class="label">Wet Clay</div>
      </div>

      <div class="arrow">→</div>

      
      <div class="step">
        <div class="step-img">
          <svg viewBox="0 0 100 70" fill="none">
            
            <rect x="20" y="15" width="60" height="50" rx="8" fill="#78350f" stroke="#451a03" stroke-width="2" />
            <path d="M 28 65 Q 28 32 50 32 Q 72 32 72 65 Z" fill="#1c1917" />
            
            <path d="M 38 65 Q 42 50 50 42 Q 58 50 62 65 Z" fill="#ea580c" />
            <path d="M 43 65 Q 46 54 50 48 Q 54 54 57 65 Z" fill="#facc15" />
            
            <path d="M 35 8 Q 40 4 45 8 Q 50 12 55 8 Q 60 4 65 8" stroke="#f97316" stroke-width="2" stroke-linecap="round" fill="none" />
          </svg>
        </div>
        <div class="label">Bake</div>
      </div>

      <div class="arrow">→</div>

      
      <div class="step">
        <div class="step-img">
          <svg viewBox="0 0 100 70" fill="none">
            
            
            <polygon points="20,28 52,14 84,28 52,42" fill="#ea580c" stroke="#9a3412" stroke-width="1.5" />
            
            <polygon points="20,28 52,42 52,58 20,44" fill="#c2410c" stroke="#9a3412" stroke-width="1.5" />
            
            <polygon points="52,42 84,28 84,44 52,58" fill="#9a3412" stroke="#7c2d12" stroke-width="1.5" />
            
            <ellipse cx="42" cy="25" rx="4" ry="2" fill="#9a3412" />
            <ellipse cx="54" cy="30" rx="4" ry="2" fill="#9a3412" />
            <ellipse cx="66" cy="25" rx="4" ry="2" fill="#9a3412" />
          </svg>
        </div>
        <div class="label">Hard Brick</div>
      </div>
    </div>
  </div>

  
  <div class="recipe-card concrete-card">
    <div class="recipe-title concrete-title">Concrete Recipe</div>
    <div class="flow">
      
      <div class="step">
        <div class="step-img">
          <svg viewBox="0 0 100 70" fill="none">
            
            
            <path d="M 12 58 Q 24 38 36 58 Z" fill="#d97706" opacity="0.85" />
            
            <path d="M 32 58 Q 48 32 64 58 Z" fill="#94a3b8" />
            
            <circle cx="68" cy="54" r="5" fill="#64748b" />
            <circle cx="78" cy="56" r="4" fill="#475569" />
            <circle cx="74" cy="48" r="4.5" fill="#64748b" />
            <circle cx="84" cy="52" r="3.5" fill="#475569" />
            
            <path d="M 50 12 C 50 12 40 25 40 30 C 40 35 44.5 39 50 39 C 55.5 39 60 35 60 30 C 60 25 50 12 50 12 Z" fill="#0284c7" />
          </svg>
        </div>
        <div class="label">Mix</div>
      </div>

      <div class="arrow">→</div>

      
      <div class="step">
        <div class="step-img">
          <svg viewBox="0 0 100 70" fill="none">
            
            
            <polygon points="25,52 65,65 92,52 52,41" fill="#e2b17a" stroke="#b47b42" stroke-width="1.5" />
            
            <ellipse cx="58" cy="52" rx="20" ry="8" fill="#64748b" />
            
            <path d="M 32 26 Q 42 38 48 50 Q 40 50 28 32 Z" fill="#64748b" opacity="0.9" />
            
            <ellipse cx="26" cy="22" rx="14" ry="18" transform="rotate(-30 26 22)" fill="#3b82f6" />
            <ellipse cx="29" cy="24" rx="6" ry="11" transform="rotate(-30 29 24)" fill="#1d4ed8" />
          </svg>
        </div>
        <div class="label">Pour</div>
      </div>

      <div class="arrow">→</div>

      
      <div class="step">
        <div class="step-img">
          <svg viewBox="0 0 100 70" fill="none">
            
            
            <polygon points="12,30 52,14 90,30 50,46" fill="#cbd5e1" stroke="#94a3b8" stroke-width="1.5" />
            
            <polygon points="12,30 50,46 50,58 12,42" fill="#94a3b8" stroke="#64748b" stroke-width="1.5" />
            
            <polygon points="50,46 90,30 90,42 50,58" fill="#64748b" stroke="#475569" stroke-width="1.5" />
            
            <line x1="31" y1="22.5" x2="71" y2="38.5" stroke="#94a3b8" stroke-width="1.5" />
          </svg>
        </div>
        <div class="label">Hard Slab</div>
      </div>
    </div>
  </div>

</body>
</html>

Observing Natural and Man-Made Rocks

<!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: #1e293b;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }

    .guide-table {
      width: 100%;
      max-width: 620px;
      display: grid;
      grid-template-columns: 0.85fr 1.1fr 1.1fr;
      gap: 8px;
    }

    /* Column Headers */
    .col-header {
      padding: 8px 6px;
      border-radius: 10px;
      text-align: center;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2px;
    }
    .header-clue {
      background: #f1f5f9;
      color: #475569;
    }
    .header-natural {
      background: #ecfdf5;
      border: 1.5px solid #a7f3d0;
      color: #065f46;
    }
    .header-manmade {
      background: #fff7ed;
      border: 1.5px solid #fed7aa;
      color: #9a3412;
    }

    .col-title {
      font-size: 13px;
      font-weight: 800;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .col-sub {
      font-size: 10.5px;
      font-weight: 500;
      opacity: 0.85;
    }

    /* Rows / Cards */
    .row-card {
      display: contents;
      cursor: pointer;
    }

    .cell {
      padding: 8px 6px;
      border-radius: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
      gap: 6px;
      background: #f8fafc;
      border: 1.5px solid #e2e8f0;
      transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .cell-clue {
      background: #f8fafc;
      font-weight: 700;
      font-size: 12px;
      color: #334155;
    }

    .cell-natural {
      background: #ffffff;
      border-color: #d1fae5;
    }
    .cell-manmade {
      background: #ffffff;
      border-color: #ffedd5;
    }

    /* Active Selection Highlight */
    .row-card.active .cell-clue {
      background: #e2e8f0;
      border-color: #94a3b8;
    }
    .row-card.active .cell-natural {
      background: #f0fdf4;
      border-color: #10b981;
      box-shadow: 0 0 0 1px #10b981;
    }
    .row-card.active .cell-manmade {
      background: #fffaf5;
      border-color: #f97316;
      box-shadow: 0 0 0 1px #f97316;
    }

    /* Labels under visuals */
    .cell-label {
      font-size: 11.5px;
      font-weight: 700;
      line-height: 1.2;
    }
    .cell-natural .cell-label { color: #047857; }
    .cell-manmade .cell-label { color: #c2410c; }

    /* Visual Graphic Containers */
    .visual-box {
      width: 44px;
      height: 38px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    /* Visual Shapes */
    /* Shape 1: Natural rock */
    .rock-natural {
      width: 38px;
      height: 30px;
      background: linear-gradient(135deg, #78716c, #44403c);
      border-radius: 60% 40% 50% 70% / 60% 40% 60% 40%;
      position: relative;
      box-shadow: inset -2px -2px 4px rgba(0,0,0,0.3);
    }
    /* Shape 1: Brick */
    .brick-manmade {
      width: 40px;
      height: 24px;
      background: linear-gradient(135deg, #ea580c, #c2410c);
      border-radius: 2px;
      border: 1px solid #9a3412;
      box-shadow: 1px 1px 0px #7c2d12;
    }

    /* Pattern 2: Natural layers/crystals */
    .layers-natural {
      width: 40px;
      height: 30px;
      border-radius: 4px;
      background: repeating-linear-gradient(
        -15deg,
        #cbd5e1,
        #cbd5e1 4px,
        #94a3b8 4px,
        #94a3b8 8px,
        #64748b 8px,
        #64748b 12px
      );
      position: relative;
      overflow: hidden;
      border: 1px solid #94a3b8;
    }
    .sparkle {
      position: absolute;
      font-size: 9px;
      color: #fef08a;
    }

    /* Pattern 2: Concrete aggregate / solid */
    .concrete-manmade {
      width: 40px;
      height: 30px;
      border-radius: 2px;
      background: #e2e8f0;
      border: 1px solid #cbd5e1;
      position: relative;
      background-image: 
        radial-gradient(#64748b 1.5px, transparent 1.5px),
        radial-gradient(#475569 1px, transparent 1px);
      background-size: 8px 8px, 6px 6px;
      background-position: 0 0, 3px 3px;
    }

    /* Surface 3: Rough bumpy */
    .surface-natural {
      width: 42px;
      height: 26px;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    /* Surface 3: Mold line / Flat */
    .surface-manmade {
      width: 42px;
      height: 26px;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    /* Icon Badge */
    .badge {
      display: inline-block;
      font-size: 13px;
      line-height: 1;
    }

    /* Footer Hint */
    .tap-hint {
      margin-top: 10px;
      font-size: 11px;
      font-weight: 600;
      color: #64748b;
      letter-spacing: 0.2px;
    }
  </style>
</head>
<body>

  <div class="guide-table" role="region" aria-label="Rock Comparison Guide">
    
    <div class="col-header header-clue">
      <span class="col-title">🔍 Clue</span>
    </div>
    <div class="col-header header-natural">
      <span class="col-title">🌿 Natural</span>
      <span class="col-sub">Granite, Slate</span>
    </div>
    <div class="col-header header-manmade">
      <span class="col-title">🏭 Human-Made</span>
      <span class="col-sub">Brick, Concrete</span>
    </div>

    
    <div class="row-card active" onclick="selectRow(0)">
      <div class="cell cell-clue">
        <span class="badge">📐</span>
        Shape
      </div>
      <div class="cell cell-natural">
        <div class="visual-box">
          <div class="rock-natural"></div>
        </div>
        <div class="cell-label">✓ Jagged / Curved</div>
      </div>
      <div class="cell cell-manmade">
        <div class="visual-box">
          <div class="brick-manmade"></div>
        </div>
        <div class="cell-label">Straight 90°</div>
      </div>
    </div>

    
    <div class="row-card" onclick="selectRow(1)">
      <div class="cell cell-clue">
        <span class="badge">✨</span>
        Inside
      </div>
      <div class="cell cell-natural">
        <div class="visual-box">
          <div class="layers-natural">
            <span class="sparkle" style="top:2px; left:4px;">✦</span>
            <span class="sparkle" style="bottom:2px; right:4px;">✦</span>
          </div>
        </div>
        <div class="cell-label">✓ Layers & Crystals</div>
      </div>
      <div class="cell cell-manmade">
        <div class="visual-box">
          <div class="concrete-manmade"></div>
        </div>
        <div class="cell-label">Mixed Specks</div>
      </div>
    </div>

    
    <div class="row-card" onclick="selectRow(2)">
      <div class="cell cell-clue">
        <span class="badge">✋</span>
        Surface
      </div>
      <div class="cell cell-natural">
        <div class="visual-box">
          <svg class="surface-natural" viewBox="0 0 44 24">
            <path d="M 2 18 Q 8 6, 14 14 T 26 8 T 36 16 T 42 10" fill="none" stroke="#059669" stroke-width="3" stroke-linecap="round"/>
          </svg>
        </div>
        <div class="cell-label">✓ Rough & Uneven</div>
      </div>
      <div class="cell cell-manmade">
        <div class="visual-box">
          <svg class="surface-manmade" viewBox="0 0 44 24">
            <line x1="2" y1="12" x2="42" y2="12" stroke="#ea580c" stroke-width="3" stroke-linecap="round"/>
            <line x1="14" y1="4" x2="14" y2="20" stroke="#fdba74" stroke-width="1.5" stroke-dasharray="2,2"/>
          </svg>
        </div>
        <div class="cell-label">Flat & Smooth</div>
      </div>
    </div>
  </div>

  <div class="tap-hint">Tap any row to compare</div>

  <script>
    const rows = document.querySelectorAll('.row-card');
    let currentIndex = 0;

    function selectRow(index) {
      rows.forEach((r, i) => {
        if (i === index) {
          r.classList.add('active');
        } else {
          r.classList.remove('active');
        }
      });
      currentIndex = index;
    }
  </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 {
      width: 100%;
      min-height: 100%;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      color: #1e2945;
      background: transparent;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 12px;
    }

    .cards-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      width: 100%;
      max-width: 620px;
    }

    .rock-card {
      border-radius: 18px;
      padding: 18px 14px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      box-shadow: 0 4px 14px rgba(30, 41, 69, 0.06);
      border: 1px solid rgba(30, 41, 69, 0.08);
      cursor: pointer;
      user-select: none;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

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

    .granite-card {
      background: #fbf8eb;
    }

    .chalk-card {
      background: #e8f4f8;
    }

    .rock-title {
      font-size: 19px;
      font-weight: 700;
      letter-spacing: -0.01em;
      margin-bottom: 8px;
    }

    .rock-visual-container {
      width: 100%;
      max-width: 160px;
      height: 140px;
      margin: 6px 0;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    .rock-svg {
      width: 100%;
      height: 100%;
      overflow: visible;
      filter: drop-shadow(0 6px 8px rgba(30, 41, 69, 0.12));
    }

    .shimmer {
      animation: pulseSparkle 2.5s ease-in-out infinite alternate;
    }

    .shimmer-delay {
      animation: pulseSparkle 2.5s ease-in-out 1.2s infinite alternate;
    }

    @keyframes pulseSparkle {
      0% { opacity: 0.3; transform: scale(0.8); }
      100% { opacity: 1; transform: scale(1.25); }
    }

    .caption {
      font-size: 13px;
      font-weight: 600;
      line-height: 1.35;
      color: #1e2945;
      opacity: 0.88;
      margin-top: 8px;
    }

    .tag {
      display: inline-block;
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      padding: 3px 8px;
      border-radius: 999px;
      margin-bottom: 6px;
    }

    .granite-tag {
      background: #fae1ce;
      color: #92400e;
    }

    .chalk-tag {
      background: #dbeafe;
      color: #1e40af;
    }

    @media (max-width: 380px) {
      .cards-grid {
        grid-template-columns: 1fr;
        gap: 12px;
      }
      .rock-visual-container {
        height: 110px;
      }
      .rock-title {
        font-size: 17px;
      }
      .caption {
        font-size: 12px;
      }
    }
  </style>
</head>
<body>
  <div class="cards-grid">
    
    <div class="rock-card granite-card" id="graniteCard">
      <span class="tag granite-tag">Igneous</span>
      <h2 class="rock-title">Granite</h2>
      
      <div class="rock-visual-container">
        <svg class="rock-svg" viewBox="0 0 160 140" aria-label="Granite rock showing speckled pink, grey and quartz grains">
          <defs>
            <linearGradient id="graniteBase" x1="0" y1="0" x2="1" y2="1">
              <stop offset="0%" stop-color="#ecc6ba" />
              <stop offset="50%" stop-color="#dab0a6" />
              <stop offset="100%" stop-color="#b8938a" />
            </linearGradient>
          </defs>
          
          
          <polygon points="25,48 50,18 105,15 140,42 148,88 122,125 52,128 18,98 14,68" fill="url(#graniteBase)" stroke="#9c7870" stroke-width="2" stroke-linejoin="round" />
          
          
          <polygon points="50,18 105,15 88,62 38,58" fill="#f4d4ca" opacity="0.6" />
          <polygon points="105,15 140,42 118,72 88,62" fill="#caa196" opacity="0.5" />
          <polygon points="140,42 148,88 108,102 118,72" fill="#b0887e" opacity="0.6" />
          <polygon points="18,98 52,128 64,88 25,48" fill="#e8c2b7" opacity="0.4" />
          <polygon points="52,128 122,125 108,102 64,88" fill="#a07a71" opacity="0.5" />

          
          <circle cx="42" cy="38" r="3.5" fill="#2d3748" />
          <circle cx="76" cy="32" r="4" fill="#1a202c" />
          <polygon points="112,32 118,36 114,40 109,35" fill="#2d3748" />
          <circle cx="62" cy="74" r="4.5" fill="#1a202c" />
          <polygon points="92,78 98,82 95,88 88,83" fill="#2d3748" />
          <circle cx="128" cy="70" r="3" fill="#2d3748" />
          <circle cx="38" cy="85" r="4" fill="#1a202c" />
          <polygon points="75,108 81,113 77,118 71,112" fill="#2d3748" />
          <circle cx="106" cy="112" r="3.5" fill="#1a202c" />
          <circle cx="132" cy="94" r="2.8" fill="#2d3748" />

          
          <ellipse cx="60" cy="48" rx="5" ry="3.5" fill="#ffffff" opacity="0.9" />
          <polygon points="98,46 106,48 102,56 94,52" fill="#ffffff" opacity="0.85" />
          <ellipse cx="46" cy="66" rx="6" ry="4" fill="#ffffff" opacity="0.9" />
          <ellipse cx="80" cy="92" rx="5.5" ry="3.5" fill="#ffffff" opacity="0.85" />
          <polygon points="120,86 128,88 124,96 116,92" fill="#ffffff" opacity="0.9" />
          <ellipse cx="48" cy="108" rx="4.5" ry="3" fill="#ffffff" opacity="0.8" />

          
          <g class="shimmer" style="transform-origin: 70px 58px;">
            <path d="M 70 52 Q 70 58 76 58 Q 70 58 70 64 Q 70 58 64 58 Q 70 58 70 52" fill="#fff" />
          </g>
          <g class="shimmer-delay" style="transform-origin: 104px 92px;">
            <path d="M 104 87 Q 104 92 109 92 Q 104 92 104 97 Q 104 92 99 92 Q 104 92 104 87" fill="#fff" />
          </g>
          <g class="shimmer" style="transform-origin: 34px 72px;">
            <path d="M 34 68 Q 34 72 38 72 Q 34 72 34 76 Q 34 72 30 72 Q 34 72 34 68" fill="#fff" />
          </g>
        </svg>
      </div>

      <p class="caption">Formed from cooling<br>underground magma.</p>
    </div>

    
    <div class="rock-card chalk-card" id="chalkCard">
      <span class="tag chalk-tag">Sedimentary</span>
      <h2 class="rock-title">Chalk</h2>
      
      <div class="rock-visual-container">
        <svg class="rock-svg" viewBox="0 0 160 140" aria-label="Chalk rock showing soft white porous texture and shell origins">
          <defs>
            <linearGradient id="chalkBase" x1="0" y1="0" x2="0" y2="1">
              <stop offset="0%" stop-color="#ffffff" />
              <stop offset="60%" stop-color="#f0f6fa" />
              <stop offset="100%" stop-color="#d6e4ed" />
            </linearGradient>
            <linearGradient id="chalkShade" x1="0" y1="0" x2="1" y2="1">
              <stop offset="0%" stop-color="#ffffff" />
              <stop offset="100%" stop-color="#cbdde8" />
            </linearGradient>
          </defs>
          
          
          <path d="M 32,45 C 42,20 85,18 115,28 C 138,36 146,65 142,96 C 138,124 105,128 72,126 C 42,124 20,114 18,85 C 16,68 22,54 32,45 Z" fill="url(#chalkBase)" stroke="#b6cddb" stroke-width="2" />

          
          <path d="M 24,66 C 50,60 95,68 138,62" fill="none" stroke="#d5e3ec" stroke-width="2.5" stroke-linecap="round" />
          <path d="M 22,88 C 60,82 100,90 136,84" fill="none" stroke="#c0d5e3" stroke-width="2.5" stroke-linecap="round" />
          <path d="M 36,108 C 65,104 98,109 122,106" fill="none" stroke="#b2cbdb" stroke-width="2" stroke-linecap="round" />

          
          
          <path d="M 52,48 A 4,4 0 1,1 55,53 A 2,2 0 1,1 53,52" fill="none" stroke="#9bbdce" stroke-width="1.2" stroke-linecap="round" />
          
          
          <path d="M 98,75 A 4,4 0 1,1 101,80 A 2,2 0 1,1 99,79" fill="none" stroke="#8faec0" stroke-width="1.2" stroke-linecap="round" />

          
          <path d="M 112,48 Q 118,44 122,49 M 112,48 Q 117,50 122,49 M 112,48 Q 115,53 121,51" fill="none" stroke="#9bbdce" stroke-width="1.2" />

          
          <path d="M 58,94 Q 64,90 68,95 M 58,94 Q 63,96 68,95 M 58,94 Q 61,99 67,97" fill="none" stroke="#8faec0" stroke-width="1.2" />

          
          <circle cx="138" cy="38" r="1.8" fill="#9bbdce" opacity="0.6" />
          <circle cx="146" cy="46" r="1.2" fill="#9bbdce" opacity="0.5" />
          <circle cx="142" cy="56" r="1.5" fill="#9bbdce" opacity="0.6" />
          <circle cx="20" cy="42" r="1.4" fill="#9bbdce" opacity="0.5" />
          <circle cx="15" cy="54" r="1.8" fill="#9bbdce" opacity="0.6" />
          <circle cx="28" cy="118" r="1.5" fill="#9bbdce" opacity="0.5" />
        </svg>
      </div>

      <p class="caption">Formed on ocean floor<br>from tiny shell pieces.</p>
    </div>
  </div>
</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;
      color: #1e2945;
      background: transparent;
      padding: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      user-select: none;
      -webkit-user-select: none;
    }

    .title {
      font-size: 15px;
      font-weight: 700;
      color: #1e2945;
      margin-bottom: 12px;
      text-align: center;
      letter-spacing: -0.2px;
    }

    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      width: 100%;
      max-width: 600px;
    }

    .rock-card {
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 12px;
      padding: 8px 6px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      cursor: pointer;
      transition: box-shadow 0.2s ease, border-color 0.2s ease;
    }

    .rock-card:hover, .rock-card.active {
      border-color: #22b7ff;
      box-shadow: 0 4px 12px rgba(34, 183, 255, 0.18);
    }

    .card-title {
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 6px;
      color: #1e2945;
    }

    .rock-preview {
      width: 100%;
      aspect-ratio: 1 / 1;
      max-height: 120px;
      border-radius: 8px;
      overflow: hidden;
      margin-bottom: 6px;
      background: #f8fafc;
      border: 1px solid #edf2f7;
    }

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

    .card-label {
      font-size: 11px;
      font-weight: 600;
      color: #64748b;
      line-height: 1.2;
    }

    @media (max-width: 380px) {
      .title {
        font-size: 14px;
        margin-bottom: 8px;
      }
      .cards-grid {
        gap: 6px;
      }
      .rock-card {
        padding: 6px 4px;
      }
      .card-title {
        font-size: 11px;
        margin-bottom: 4px;
      }
      .card-label {
        font-size: 9.5px;
      }
    }
  </style>
</head>
<body>

  <div class="title">Key Contrast: Three Rock Types</div>

  <div class="cards-grid">
    
    <div class="rock-card active" onclick="selectCard(this)">
      <div class="card-title">Sedimentary</div>
      <div class="rock-preview">
        <svg viewBox="0 0 100 100" preserveAspectRatio="none">
          
          <rect x="0" y="0" width="100" height="34" fill="#e8dfcf" />
          <circle cx="15" cy="10" r="4" fill="#c4b59d" />
          <circle cx="38" cy="18" r="5" fill="#d2c4ad" />
          <circle cx="62" cy="12" r="3.5" fill="#b8a78e" />
          <circle cx="82" cy="22" r="4.5" fill="#c4b59d" />
          <circle cx="28" cy="26" r="3" fill="#d2c4ad" />
          <circle cx="90" cy="8" r="3" fill="#b8a78e" />

          
          <line x1="0" y1="34" x2="100" y2="34" stroke="#c0b39d" stroke-width="1.5" />
          <rect x="0" y="34" width="100" height="34" fill="#dfd3be" />
          <circle cx="18" cy="48" r="4" fill="#b5a489" />
          <circle cx="85" cy="52" r="4.5" fill="#b5a489" />
          <circle cx="76" cy="42" r="3" fill="#cbbea6" />
          
          <g transform="translate(42, 42) scale(0.65)" stroke="#7c6f59" stroke-width="1.6" fill="none" stroke-linecap="round">
            <path d="M 0,0 C 8,-12 20,-6 20,4 C 20,14 6,18 -2,12 C -8,6 -4,-2 2,-2 C 7,-2 9,2 7,5 C 5,8 2,7 1,5" />
            <line x1="12" y1="-2" x2="16" y2="1" />
            <line x1="16" y1="6" x2="19" y2="10" />
            <line x1="9" y1="14" x2="12" y2="17" />
          </g>

          
          <line x1="0" y1="68" x2="100" y2="68" stroke="#bbaea0" stroke-width="1.5" />
          <rect x="0" y="68" width="100" height="32" fill="#d5c7b0" />
          <circle cx="12" cy="82" r="5" fill="#af9e84" />
          <circle cx="34" cy="76" r="3.5" fill="#beaf96" />
          <circle cx="54" cy="88" r="4" fill="#af9e84" />
          <circle cx="74" cy="80" r="5.5" fill="#beaf96" />
          <circle cx="92" cy="86" r="3" fill="#af9e84" />
        </svg>
      </div>
      <div class="card-label">Grains &amp; Fossils</div>
    </div>

    
    <div class="rock-card" onclick="selectCard(this)">
      <div class="card-title">Igneous</div>
      <div class="rock-preview">
        <svg viewBox="0 0 100 100" preserveAspectRatio="none" stroke="#2d3748" stroke-width="0.8">
          
          <polygon points="0,0 35,0 28,26 0,38" fill="#e2e8f0" />
          <polygon points="35,0 72,0 60,30 28,26" fill="#fbcfe8" />
          <polygon points="72,0 100,0 100,32 60,30" fill="#334155" />
          <polygon points="0,38 28,26 42,52 18,65 0,60" fill="#cbd5e1" />
          <polygon points="28,26 60,30 50,58 42,52" fill="#475569" />
          <polygon points="60,30 100,32 82,62 50,58" fill="#fbcfe8" />
          <polygon points="100,32 100,75 82,62" fill="#e2e8f0" />
          <polygon points="0,60 18,65 24,100 0,100" fill="#fbcfe8" />
          <polygon points="18,65 42,52 64,74 48,100 24,100" fill="#334155" />
          <polygon points="42,52 50,58 82,62 64,74" fill="#e2e8f0" />
          <polygon points="82,62 100,75 100,100 78,100 64,74" fill="#475569" />
          <polygon points="48,100 64,74 78,100" fill="#cbd5e1" />
        </svg>
      </div>
      <div class="card-label">Interlocking<br>Crystals</div>
    </div>

    
    <div class="rock-card" onclick="selectCard(this)">
      <div class="card-title">Metamorphic</div>
      <div class="rock-preview">
        <svg viewBox="0 0 100 100" preserveAspectRatio="none">
          
          <path d="M 0,0 C 30,12 70,-4 100,6 L 100,20 C 70,10 30,26 0,14 Z" fill="#334155" />
          <path d="M 0,14 C 30,26 70,10 100,20 L 100,38 C 65,24 35,42 0,28 Z" fill="#e2e8f0" />
          <path d="M 0,28 C 35,42 65,24 100,38 L 100,56 C 70,44 30,62 0,48 Z" fill="#ec4899" opacity="0.85" />
          <path d="M 0,48 C 30,62 70,44 100,56 L 100,74 C 65,60 35,78 0,64 Z" fill="#1e293b" />
          <path d="M 0,64 C 35,78 65,60 100,74 L 100,88 C 70,76 30,94 0,80 Z" fill="#cbd5e1" />
          <path d="M 0,80 C 30,94 70,76 100,88 L 100,100 L 0,100 Z" fill="#334155" />
        </svg>
      </div>
      <div class="card-label">Wavy Foliated<br>Bands</div>
    </div>
  </div>

  <script>
    function selectCard(card) {
      document.querySelectorAll('.rock-card').forEach(c => c.classList.remove('active'));
      card.classList.add('active');
    }
  </script>
</body>
</html>

Physical Properties of Sedimentary Rocks

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Fossil Formation</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: #1e293b;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      padding: 10px;
      user-select: none;
    }

    .container {
      width: 100%;
      max-width: 460px;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    /* Step Selector Tabs */
    .tabs {
      display: flex;
      width: 100%;
      gap: 6px;
    }
    .tab-btn {
      flex: 1;
      border: 1px solid #e2e8f0;
      background: #f8fafc;
      color: #64748b;
      font-size: 12px;
      font-weight: 700;
      padding: 8px 4px;
      border-radius: 8px;
      cursor: pointer;
      text-align: center;
      transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
    }
    .tab-btn:hover {
      background: #f1f5f9;
      color: #334155;
    }
    .tab-btn.active {
      background: #d97706;
      color: #ffffff;
      border-color: #d97706;
      box-shadow: 0 2px 6px rgba(217, 119, 6, 0.25);
    }

    /* Main Stage */
    .stage {
      position: relative;
      width: 100%;
      aspect-ratio: 16 / 10;
      background: #f8fafc;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
      border: 1px solid #e2e8f0;
    }

    .step-view {
      position: absolute;
      inset: 0;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.35s ease;
      display: flex;
      flex-direction: column;
    }
    .step-view.active {
      opacity: 1;
      pointer-events: auto;
    }

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

    /* Bottom Controls */
    .controls {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      gap: 8px;
    }
    .ctrl-btn {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      color: #334155;
      font-size: 13px;
      font-weight: 600;
      padding: 7px 16px;
      border-radius: 20px;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: background-color 0.2s, border-color 0.2s;
    }
    .ctrl-btn:hover {
      background: #f1f5f9;
      border-color: #94a3b8;
    }
    .badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: #fef3c7;
      color: #92400e;
      border: 1px solid #fde68a;
      font-size: 12px;
      font-weight: 700;
      padding: 6px 12px;
      border-radius: 12px;
      text-align: center;
      white-space: nowrap;
    }

    /* Animation effects */
    @keyframes gentlePulse {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(3px); }
    }
    .arrow-down {
      animation: gentlePulse 2s ease-in-out infinite;
    }

    @media (max-width: 380px) {
      .tab-btn {
        font-size: 11px;
        padding: 6px 2px;
      }
      .ctrl-btn {
        font-size: 12px;
        padding: 6px 12px;
      }
      .badge {
        font-size: 11px;
        padding: 5px 8px;
      }
    }
  </style>
</head>
<body>

  <div class="container">
    
    <div class="tabs" role="tablist">
      <button class="tab-btn active" id="tab0" role="tab" aria-selected="true">1. Burial</button>
      <button class="tab-btn" id="tab1" role="tab" aria-selected="false">2. Compaction</button>
      <button class="tab-btn" id="tab2" role="tab" aria-selected="false">3. Fossil</button>
    </div>

    
    <div class="stage">
      
      
      <div class="step-view active" id="view0">
        <svg viewBox="0 0 400 250">
          <defs>
            <linearGradient id="waterGrad" x1="0" y1="0" x2="0" y2="1">
              <stop offset="0%" stop-color="#bae6fd"/>
              <stop offset="100%" stop-color="#7dd3fc"/>
            </linearGradient>
            <linearGradient id="sandGrad1" x1="0" y1="0" x2="0" y2="1">
              <stop offset="0%" stop-color="#fef08a"/>
              <stop offset="100%" stop-color="#eab308"/>
            </linearGradient>
            <linearGradient id="sandBed" x1="0" y1="0" x2="0" y2="1">
              <stop offset="0%" stop-color="#e2b170"/>
              <stop offset="100%" stop-color="#ca8a04"/>
            </linearGradient>
          </defs>

          
          <rect x="0" y="0" width="400" height="110" fill="url(#waterGrad)"/>
          <path d="M0 110 Q100 105, 200 110 T400 110 L400 250 L0 250 Z" fill="url(#sandGrad1)"/>
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          <circle cx="170" cy="95" r="2.5" fill="#ca8a04" opacity="0.6"/>
          <circle cx="210" cy="85" r="2.5" fill="#ca8a04" opacity="0.6"/>
          <circle cx="190" cy="105" r="3" fill="#ca8a04" opacity="0.7"/>
          <circle cx="230" cy="100" r="2" fill="#ca8a04" opacity="0.6"/>

          
          <g transform="translate(170, 140)">
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          </g>

          
          <rect x="12" y="12" width="94" height="24" rx="6" fill="#ffffff" opacity="0.9"/>
          <text x="59" y="28" font-size="12" font-weight="700" fill="#0369a1" text-anchor="middle">Lake Water</text>

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          <text x="59" y="211" font-size="12" font-weight="700" fill="#854d0e" text-anchor="middle">Sand Layers</text>
        </svg>
      </div>

      
      <div class="step-view" id="view1">
        <svg viewBox="0 0 400 250">
          <defs>
            <linearGradient id="layerA" x1="0" y1="0" x2="0" y2="1">
              <stop offset="0%" stop-color="#fed7aa"/>
              <stop offset="100%" stop-color="#fdba74"/>
            </linearGradient>
            <linearGradient id="layerB" x1="0" y1="0" x2="0" y2="1">
              <stop offset="0%" stop-color="#d4a373"/>
              <stop offset="100%" stop-color="#bc6c25"/>
            </linearGradient>
            <linearGradient id="layerC" x1="0" y1="0" x2="0" y2="1">
              <stop offset="0%" stop-color="#a8896c"/>
              <stop offset="100%" stop-color="#8b6e50"/>
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          </defs>

          
          <rect x="0" y="0" width="400" height="75" fill="url(#layerA)"/>
          <line x1="0" y1="75" x2="400" y2="75" stroke="#ea580c" stroke-width="1" stroke-dasharray="4 3" opacity="0.4"/>
          
          <rect x="0" y="75" width="400" height="85" fill="url(#layerB)"/>
          <line x1="0" y1="160" x2="400" y2="160" stroke="#7c2d12" stroke-width="1" stroke-dasharray="4 3" opacity="0.4"/>

          <rect x="0" y="160" width="400" height="90" fill="url(#layerC)"/>

          
          <g class="arrow-down" fill="#c2410c">
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          <g transform="translate(170, 168) scale(1, 0.85)">
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          <rect x="153" y="10" width="94" height="24" rx="6" fill="#ffffff" opacity="0.9"/>
          <text x="200" y="26" font-size="12" font-weight="700" fill="#9a3412" text-anchor="middle">Pressure</text>

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          <text x="64" y="211" font-size="12" font-weight="700" fill="#431407" text-anchor="middle">Deep Strata</text>
        </svg>
      </div>

      
      <div class="step-view" id="view2">
        <svg viewBox="0 0 400 250">
          <defs>
            <linearGradient id="rockGrad" x1="0" y1="0" x2="1" y2="1">
              <stop offset="0%" stop-color="#d6d3d1"/>
              <stop offset="50%" stop-color="#a8a29e"/>
              <stop offset="100%" stop-color="#78716c"/>
            </linearGradient>
            <filter id="insetShadow" x="-10%" y="-10%" width="120%" height="120%">
              <feDropShadow dx="1" dy="2" stdDeviation="1.5" flood-color="#292524" flood-opacity="0.5"/>
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          </defs>

          
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            <path d="M30 42 L22 4" stroke="#292524" stroke-width="2" stroke-linecap="round"/>
            <path d="M30 42 L30 2" stroke="#292524" stroke-width="2" stroke-linecap="round"/>
            <path d="M30 42 L38 4" stroke="#292524" stroke-width="2" stroke-linecap="round"/>
            <path d="M30 42 L48 10" stroke="#292524" stroke-width="2" stroke-linecap="round"/>
          </g>

          
          <rect x="135" y="190" width="130" height="26" rx="6" fill="#1c1917" opacity="0.9"/>
          <text x="200" y="207" font-size="12" font-weight="700" fill="#fafaf9" text-anchor="middle">Rock Imprint</text>
        </svg>
      </div>

    </div>

    
    <div class="controls">
      <button class="ctrl-btn" id="prevBtn" type="button">← Back</button>
      <div class="badge" id="stepBadge">1. Burial</div>
      <button class="ctrl-btn" id="nextBtn" type="button">Next →</button>
    </div>
  </div>

  <script>
    const tabs = [
      document.getElementById('tab0'),
      document.getElementById('tab1'),
      document.getElementById('tab2')
    ];
    const views = [
      document.getElementById('view0'),
      document.getElementById('view1'),
      document.getElementById('view2')
    ];
    const badge = document.getElementById('stepBadge');
    const prevBtn = document.getElementById('prevBtn');
    const nextBtn = document.getElementById('nextBtn');
    const badgeTexts = ['1. Burial', '2. Compaction', '3. Preserved Fossil'];

    let currentStep = 0;
    let timer = null;

    function showStep(index) {
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      tabs.forEach((tab, i) => {
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      showStep(currentStep - 1);
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      }, 4000);
    }

    function stopAuto() {
      if (timer) {
        clearInterval(timer);
        timer = null;
      }
    }

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

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      user-select: none;
    }

    body {
      width: 100%;
      min-height: 100%;
      background: #ffffff;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 10px;
    }

    .toolbar {
      display: flex;
      gap: 8px;
      margin-bottom: 12px;
      background: #f1f5f9;
      padding: 4px;
      border-radius: 20px;
    }

    .tab-btn {
      border: none;
      background: transparent;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 600;
      color: #64748b;
      border-radius: 16px;
      cursor: pointer;
      transition: all 0.25s ease;
    }

    .tab-btn.active {
      background: #ffffff;
      color: #0284c7;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
    }

    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      width: 100%;
      max-width: 480px;
      align-items: start;
    }

    .rock-card {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      position: relative;
    }

    .lens-wrapper {
      position: relative;
      width: 100%;
      max-width: 170px;
      aspect-ratio: 1 / 1;
      border-radius: 50%;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12), inset 0 0 0 5px #cbd5e1;
      overflow: hidden;
      background: #f8fafc;
      transition: box-shadow 0.3s ease;
    }

    .lens-wrapper.sedimentary {
      border: 3px solid #0284c7;
    }

    .lens-wrapper.igneous {
      border: 3px solid #64748b;
    }

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

    .glare {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background: radial-gradient(circle at 35% 25%, rgba(255,255,255,0.45) 0%, rgba(255,255,255,0) 60%);
      pointer-events: none;
    }

    .label-badge {
      margin-top: 10px;
      padding: 4px 10px;
      border-radius: 12px;
      font-size: 14px;
      font-weight: 700;
      line-height: 1.2;
    }

    .badge-blue {
      background: #e0f2fe;
      color: #0284c7;
    }

    .badge-gray {
      background: #f1f5f9;
      color: #475569;
    }

    .sub-label {
      font-size: 12px;
      font-weight: 600;
      color: #64748b;
      margin-top: 3px;
    }

    /* Rub Test Animation Elements */
    .crumbles {
      position: absolute;
      inset: 0;
      pointer-events: none;
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .rubbing .crumbles {
      opacity: 1;
    }

    .crumb {
      position: absolute;
      background: #d97706;
      border-radius: 50%;
      opacity: 0;
    }

    .rubbing .crumb {
      animation: fall 1.6s infinite cubic-bezier(0.4, 0, 0.6, 1);
    }

    .crumb:nth-child(1) { left: 45%; top: 40%; width: 6px; height: 6px; animation-delay: 0.1s; }
    .crumb:nth-child(2) { left: 55%; top: 45%; width: 5px; height: 5px; animation-delay: 0.5s; }
    .crumb:nth-child(3) { left: 40%; top: 50%; width: 7px; height: 7px; animation-delay: 0.9s; }
    .crumb:nth-child(4) { left: 60%; top: 55%; width: 4px; height: 4px; animation-delay: 1.2s; }

    @keyframes fall {
      0% { transform: translateY(0) scale(1); opacity: 0.9; }
      80% { transform: translateY(45px) scale(0.8); opacity: 0.7; }
      100% { transform: translateY(60px) scale(0); opacity: 0; }
    }

    .rock-shake {
      transition: transform 0.1s ease;
    }

    .rubbing .rock-shake {
      animation: shake 0.5s infinite ease-in-out;
    }

    @keyframes shake {
      0%, 100% { transform: translateX(0); }
      25% { transform: translateX(-2px) rotate(-1deg); }
      75% { transform: translateX(2px) rotate(1deg); }
    }

    @media (max-width: 380px) {
      .label-badge {
        font-size: 12px;
        padding: 3px 8px;
      }
      .sub-label {
        font-size: 11px;
      }
    }
  </style>
</head>
<body>

  <div class="toolbar">
    <button class="tab-btn active" id="btnMicro">🔬 Grain View</button>
    <button class="tab-btn" id="btnRub">✋ Rub Test</button>
  </div>

  <div class="comparison-grid">
    
    <div class="rock-card">
      <div class="lens-wrapper sedimentary">
        <div class="rock-shake" id="sedRock">
          <svg class="lens-svg" viewBox="0 0 160 160">
            
            <rect width="160" height="160" fill="#e2d4c0" />
            
            
            <circle cx="80" cy="78" r="1.5" fill="#bfa07a" />
            <circle cx="48" cy="80" r="1.5" fill="#bfa07a" />
            <circle cx="112" cy="82" r="1.5" fill="#bfa07a" />
            <circle cx="78" cy="115" r="1.5" fill="#bfa07a" />

            
            <g stroke="#92400e" stroke-width="1.5" opacity="0.95">
              <ellipse cx="46" cy="46" rx="20" ry="18" fill="#f59e0b" />
              <ellipse cx="92" cy="40" rx="18" ry="16" fill="#fbbf24" />
              <ellipse cx="132" cy="58" rx="19" ry="21" fill="#d97706" />
              <ellipse cx="28" cy="88" rx="18" ry="16" fill="#fcd34d" />
              <ellipse cx="78" cy="82" rx="22" ry="20" fill="#f59e0b" />
              <ellipse cx="128" cy="102" rx="17" ry="18" fill="#fbbf24" />
              <ellipse cx="44" cy="126" rx="21" ry="17" fill="#d97706" />
              <ellipse cx="94" cy="124" rx="20" ry="19" fill="#f59e0b" />
              <ellipse cx="140" cy="144" rx="14" ry="13" fill="#fcd34d" />
              <ellipse cx="16" cy="142" rx="12" ry="11" fill="#fbbf24" />
            </g>
          </svg>
        </div>
        <div class="crumbles">
          <div class="crumb"></div>
          <div class="crumb"></div>
          <div class="crumb"></div>
          <div class="crumb"></div>
        </div>
        <div class="glare"></div>
      </div>
      <div class="label-badge badge-blue">Rounded Grains</div>
      <div class="sub-label" id="sedSub">Glued with gaps</div>
    </div>

    
    <div class="rock-card">
      <div class="lens-wrapper igneous">
        <div class="rock-shake" id="ignRock">
          <svg class="lens-svg" viewBox="0 0 160 160">
            
            <g stroke="#1e293b" stroke-width="1.5" stroke-linejoin="miter">
              <polygon points="0,0 60,0 45,52 0,40" fill="#64748b" />
              <polygon points="60,0 125,0 105,48 45,52" fill="#cbd5e1" />
              <polygon points="125,0 160,0 160,55 105,48" fill="#475569" />
              
              <polygon points="0,40 45,52 38,102 0,90" fill="#94a3b8" />
              <polygon points="45,52 105,48 85,98 38,102" fill="#334155" />
              <polygon points="105,48 160,55 160,108 120,95 85,98" fill="#e2e8f0" />
              
              <polygon points="0,90 38,102 48,160 0,160" fill="#cbd5e1" />
              <polygon points="38,102 85,98 108,160 48,160" fill="#64748b" />
              <polygon points="85,98 120,95 160,140 160,160 108,160" fill="#94a3b8" />
              <polygon points="120,95 160,108 160,140" fill="#334155" />
            </g>
          </svg>
        </div>
        <div class="glare"></div>
      </div>
      <div class="label-badge badge-gray">Interlocking Crystals</div>
      <div class="sub-label" id="ignSub">Zero gaps</div>
    </div>
  </div>

  <script>
    const btnMicro = document.getElementById('btnMicro');
    const btnRub = document.getElementById('btnRub');
    const sedCard = document.querySelector('.sedimentary');
    const ignCard = document.querySelector('.igneous');
    const sedSub = document.getElementById('sedSub');
    const ignSub = document.getElementById('ignSub');

    btnMicro.addEventListener('click', () => {
      btnMicro.classList.add('active');
      btnRub.classList.remove('active');
      sedCard.classList.remove('rubbing');
      ignCard.classList.remove('rubbing');
      sedSub.textContent = 'Glued with gaps';
      ignSub.textContent = 'Zero gaps';
    });

    btnRub.addEventListener('click', () => {
      btnRub.classList.add('active');
      btnMicro.classList.remove('active');
      sedCard.classList.add('rubbing');
      ignCard.classList.add('rubbing');
      sedSub.textContent = 'Sheds sand grains';
      ignSub.textContent = 'Stays solid';
    });
  </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>Porous vs Non-Porous Rock Comparison</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
      background: transparent;
      color: #1e293b;
      padding: 8px;
    }

    .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
      max-width: 680px;
      margin: 0 auto;
    }

    @media (max-width: 520px) {
      .container {
        grid-template-columns: 1fr;
        gap: 16px;
      }
    }

    .panel {
      display: flex;
      flex-direction: column;
      align-items: center;
      background: transparent;
      padding: 0;
    }

    .panel-header {
      text-align: center;
      margin-bottom: 8px;
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
    }

    .title {
      font-size: 14.5px;
      font-weight: 700;
      color: #0f172a;
      letter-spacing: -0.01em;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 5px;
      font-size: 11.5px;
      font-weight: 600;
      padding: 3px 10px;
      border-radius: 999px;
    }

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

    .badge-nonporous {
      background: #f1f5f9;
      color: #475569;
      border: 1px solid #cbd5e1;
    }

    .stage-wrapper {
      width: 100%;
      background: #f8fafc;
      border-radius: 10px;
      border: 1px solid #e2e8f0;
      overflow: hidden;
      position: relative;
    }

    svg {
      display: block;
      width: 100%;
      height: auto;
      aspect-ratio: 260 / 235;
    }

    /* Calibrated Smooth Animations (>500ms holds to prevent flicker/rapid loop) */
    .anim-drop-porous {
      animation: dropPorous 5.4s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    }

    .anim-soak {
      animation: soakIn 5.4s ease-in-out infinite;
    }

    .anim-drop-nonporous {
      animation: dropNonPorous 5.4s ease-in-out infinite;
    }

    .anim-runoff-stream {
      animation: runoffStream 5.4s ease-in-out infinite;
    }

    .anim-coin-scratch {
      animation: coinScratchAction 5.4s ease-in-out infinite;
      transform-origin: 52px 190px;
    }

    .anim-coin-glide {
      animation: coinGlideAction 5.4s ease-in-out infinite;
      transform-origin: 52px 190px;
    }

    .anim-sand-flakes {
      animation: flakeShed 5.4s ease-out infinite;
    }

    /* Keyframes with smooth fade and hold states */
    @keyframes dropPorous {
      0%, 4% { transform: translateY(0px); opacity: 0; }
      12% { opacity: 1; }
      28% { transform: translateY(48px) scale(1, 0.9); opacity: 1; }
      38% { transform: translateY(58px) scale(0.6, 0.4); opacity: 0.2; }
      44%, 100% { transform: translateY(58px) scale(0); opacity: 0; }
    }

    @keyframes soakIn {
      0%, 25% { opacity: 0; transform: scale(0.4); transform-origin: 130px 92px; }
      40% { opacity: 0.85; transform: scale(0.95); transform-origin: 130px 92px; }
      68% { opacity: 0.85; transform: scale(1.05); transform-origin: 130px 92px; }
      85%, 100% { opacity: 0; transform: scale(1.05); transform-origin: 130px 92px; }
    }

    @keyframes dropNonPorous {
      0%, 4% { transform: translate(0, 0px) scale(1); opacity: 0; }
      12% { opacity: 1; }
      26% { transform: translate(0, 48px) scale(1); opacity: 1; }
      32% { transform: translate(0, 50px) scale(1.2, 0.75); opacity: 1; } /* Beads and rests */
      54% { transform: translate(0, 50px) scale(1.2, 0.75); opacity: 1; } /* Clear hold >1s */
      66% { transform: translate(32px, 54px) scale(1.1, 0.85); opacity: 1; } /* Rolls */
      78% { transform: translate(76px, 78px) scale(0.85, 1.05); opacity: 1; } /* Off slope */
      86% { transform: translate(92px, 105px) scale(0.5); opacity: 0; }
      100% { transform: translate(92px, 105px) opacity: 0; }
    }

    @keyframes runoffStream {
      0%, 54% { stroke-dashoffset: 45; opacity: 0; }
      62% { opacity: 0.8; }
      78% { stroke-dashoffset: 0; opacity: 0.8; }
      88%, 100% { opacity: 0; }
    }

    @keyframes coinScratchAction {
      0%, 45% { transform: translate(0, 0) rotate(0deg); }
      53% { transform: translate(-4px, 1px) rotate(-5deg); }
      62% { transform: translate(4px, -1px) rotate(4deg); }
      71% { transform: translate(-3px, 1px) rotate(-4deg); }
      79% { transform: translate(0, 0) rotate(0deg); }
      100% { transform: translate(0, 0) rotate(0deg); }
    }

    @keyframes coinGlideAction {
      0%, 45% { transform: translate(0, 0); }
      55% { transform: translate(6px, 0); }
      68% { transform: translate(-4px, 0); }
      78%, 100% { transform: translate(0, 0); }
    }

    @keyframes flakeShed {
      0%, 52% { opacity: 0; transform: translate(0, 0); }
      58% { opacity: 1; transform: translate(-3px, 4px); }
      74% { opacity: 0.9; transform: translate(-6px, 12px); }
      86%, 100% { opacity: 0; transform: translate(-9px, 18px); }
    }
  </style>
</head>
<body>

  <div class="container">
    
    <div class="panel">
      <div class="panel-header">
        <div class="title">Porous Sedimentary Rock</div>
        <div class="badge badge-porous">
          <svg width="12" height="12" viewBox="0 0 24 24" fill="#0284c7" style="aspect-ratio: auto; display: inline;">
            <path d="M12 2.69l5.66 5.66a8 8 0 1 1-11.31 0z"/>
          </svg>
          Absorbs Water
        </div>
      </div>

      <div class="stage-wrapper">
        <svg viewBox="0 0 260 235" aria-label="Diagram showing water sinking into porous sedimentary rock and coin flaking sand grains">
          <defs>
            
            <pattern id="porousGrains" width="18" height="18" patternUnits="userSpaceOnUse">
              <circle cx="5" cy="5" r="4" fill="#d97706" opacity="0.32"/>
              <circle cx="14" cy="5" r="3.5" fill="#b45309" opacity="0.28"/>
              <circle cx="5" cy="14" r="3.5" fill="#d97706" opacity="0.32"/>
              <circle cx="14" cy="14" r="4" fill="#f59e0b" opacity="0.35"/>
              <circle cx="9.5" cy="9.5" r="2.2" fill="#92400e" opacity="0.25"/>
            </pattern>
            
            <linearGradient id="dropGrad" x1="0%" y1="0%" x2="0%" y2="100%">
              <stop offset="0%" stop-color="#38bdf8"/>
              <stop offset="100%" stop-color="#0284c7"/>
            </linearGradient>
            
            <radialGradient id="moistureGrad" cx="50%" cy="40%" r="60%">
              <stop offset="0%" stop-color="#0284c7" stop-opacity="0.8"/>
              <stop offset="55%" stop-color="#0369a1" stop-opacity="0.5"/>
              <stop offset="100%" stop-color="#0284c7" stop-opacity="0"/>
            </radialGradient>
          </defs>

          
          <g class="anim-drop-porous">
            <path d="M 130 18 C 124 28 120 35 120 42 A 10 10 0 0 0 140 42 C 140 35 136 28 130 18 Z" fill="url(#dropGrad)"/>
            <ellipse cx="127" cy="40" rx="2.5" ry="3.5" fill="#ffffff" opacity="0.65"/>
          </g>

          
          <rect x="15" y="68" width="230" height="74" rx="6" fill="#fef3c7" stroke="#d97706" stroke-width="1.5"/>
          <rect x="15" y="68" width="230" height="74" rx="6" fill="url(#porousGrains)"/>

          
          <g opacity="0.6" fill="#78350f">
            <circle cx="45" cy="80" r="1.5"/><circle cx="70" cy="86" r="1.2"/><circle cx="95" cy="78" r="1.8"/>
            <circle cx="120" cy="84" r="1.5"/><circle cx="145" cy="79" r="1.4"/><circle cx="170" cy="87" r="1.6"/>
            <circle cx="195" cy="81" r="1.5"/><circle cx="220" cy="88" r="1.3"/><circle cx="80" cy="115" r="1.6"/>
            <circle cx="180" cy="116" r="1.4"/>
          </g>

          
          <ellipse class="anim-soak" cx="130" cy="90" rx="44" ry="22" fill="url(#moistureGrad)"/>

          
          <rect x="42" y="120" width="176" height="18" rx="9" fill="#ffffff" fill-opacity="0.92" stroke="#fed7aa" stroke-width="1"/>
          <text x="130" y="133" text-anchor="middle" font-size="10.5" font-weight="700" fill="#9a3412">Pores absorb water inward</text>

          
          <line x1="15" y1="152" x2="245" y2="152" stroke="#e2e8f0" stroke-dasharray="3 3" stroke-width="1.5"/>
          <rect x="15" y="160" width="230" height="64" rx="6" fill="#fffbeb" stroke="#fde68a" stroke-width="1"/>
          
          
          <g class="anim-sand-flakes">
            <circle cx="44" cy="194" r="1.8" fill="#d97706"/>
            <circle cx="39" cy="198" r="1.4" fill="#b45309"/>
            <circle cx="43" cy="202" r="2.0" fill="#92400e"/>
            <circle cx="35" cy="200" r="1.5" fill="#d97706"/>
          </g>

          
          <g class="anim-coin-scratch">
            <circle cx="52" cy="186" r="11" fill="#facc15" stroke="#ca8a04" stroke-width="1.5"/>
            <circle cx="52" cy="186" r="8.5" fill="none" stroke="#eab308" stroke-width="1"/>
            <text x="52" y="190" font-size="11" font-weight="800" fill="#854d0e" text-anchor="middle">¢</text>
          </g>

          
          <text x="72" y="180" font-size="11" font-weight="700" fill="#92400e">Coin Scratch Test:</text>
          <text x="72" y="195" font-size="10" font-weight="600" fill="#b45309">Scratches easily</text>
          <text x="72" y="209" font-size="9.5" font-weight="500" fill="#78350f">Flakes off soft sand grains</text>
        </svg>
      </div>
    </div>

    
    <div class="panel">
      <div class="panel-header">
        <div class="title">Non-Porous Hard Rock</div>
        <div class="badge badge-nonporous">
          <svg width="12" height="12" viewBox="0 0 24 24" fill="#475569" style="aspect-ratio: auto; display: inline;">
            <path d="M12 2.69l5.66 5.66a8 8 0 1 1-11.31 0z"/>
          </svg>
          Water Runs Off
        </div>
      </div>

      <div class="stage-wrapper">
        <svg viewBox="0 0 260 235" aria-label="Diagram showing water beading and running off sealed hard rock, and coin resisting scratch">
          <defs>
            
            <pattern id="crystalGrains" width="22" height="22" patternUnits="userSpaceOnUse">
              <polygon points="0,0 12,0 8,12 0,8" fill="#94a3b8" opacity="0.32"/>
              <polygon points="12,0 22,0 22,10 14,8" fill="#64748b" opacity="0.38"/>
              <polygon points="8,12 14,8 22,10 18,22 8,18" fill="#475569" opacity="0.28"/>
              <polygon points="0,8 8,12 8,18 0,22" fill="#cbd5e1" opacity="0.45"/>
            </pattern>
          </defs>

          
          <g class="anim-drop-nonporous">
            <path d="M 115 18 C 109 28 105 35 105 42 A 10 10 0 0 0 125 42 C 125 35 121 28 115 18 Z" fill="url(#dropGrad)"/>
            <ellipse cx="112" cy="40" rx="2.5" ry="3.5" fill="#ffffff" opacity="0.65"/>
          </g>

          
          <path class="anim-runoff-stream" d="M 115 70 Q 155 70 205 82" fill="none" stroke="#38bdf8" stroke-width="3" stroke-linecap="round" stroke-dasharray="8 6"/>

          
          <path d="M 15 68 Q 125 66 245 80 L 245 142 Q 125 142 15 142 Z" fill="#e2e8f0" stroke="#475569" stroke-width="1.5"/>
          <path d="M 15 68 Q 125 66 245 80 L 245 142 Q 125 142 15 142 Z" fill="url(#crystalGrains)"/>

          
          <path d="M 15 68 Q 125 66 244 80" stroke="#ffffff" stroke-width="2.5" fill="none" opacity="0.95"/>

          
          <ellipse cx="55" cy="67" rx="7.5" ry="4.5" fill="#38bdf8" opacity="0.9"/>
          <ellipse cx="53" cy="65.5" rx="2" ry="1.2" fill="#ffffff" opacity="0.9"/>

          
          <rect x="42" y="120" width="176" height="18" rx="9" fill="#ffffff" fill-opacity="0.92" stroke="#cbd5e1" stroke-width="1"/>
          <text x="130" y="133" text-anchor="middle" font-size="10.5" font-weight="700" fill="#1e293b">Sealed surface repels water</text>

          
          <line x1="15" y1="152" x2="245" y2="152" stroke="#e2e8f0" stroke-dasharray="3 3" stroke-width="1.5"/>
          <rect x="15" y="160" width="230" height="64" rx="6" fill="#f8fafc" stroke="#e2e8f0" stroke-width="1"/>

          
          <rect x="36" y="196" width="30" height="6" rx="2" fill="#94a3b8" stroke="#64748b" stroke-width="0.5"/>

          
          <g class="anim-coin-glide">
            <circle cx="50" cy="186" r="11" fill="#facc15" stroke="#ca8a04" stroke-width="1.5"/>
            <circle cx="50" cy="186" r="8.5" fill="none" stroke="#eab308" stroke-width="1"/>
            <text x="50" y="190" font-size="11" font-weight="800" fill="#854d0e" text-anchor="middle">¢</text>
          </g>

          
          <text x="72" y="180" font-size="11" font-weight="700" fill="#334155">Coin Scratch Test:</text>
          <text x="72" y="195" font-size="10" font-weight="600" fill="#0f766e">No scratch (Hard surface)</text>
          <text x="72" y="209" font-size="9.5" font-weight="500" fill="#64748b">Interlocking crystals resist flaking</text>
        </svg>
      </div>
    </div>
  </div>

</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">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #ffffff;
      color: #1e2945;
      padding: 14px 12px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      min-height: 100%;
      user-select: none;
    }

    .header {
      text-align: center;
      margin-bottom: 10px;
    }

    .title {
      font-size: 17px;
      font-weight: 800;
      color: #1e2945;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .clue-list {
      display: flex;
      flex-direction: column;
      gap: 8px;
      margin-bottom: 12px;
    }

    .clue-item {
      display: flex;
      align-items: center;
      background: #f8fafc;
      border: 1.5px solid #e2e8f0;
      border-radius: 10px;
      padding: 8px 12px;
      gap: 12px;
      transition: background-color 0.2s ease, border-color 0.2s ease;
    }

    .clue-item.active {
      background: #f0fdf4;
      border-color: #86efac;
    }

    .checkbox {
      width: 26px;
      height: 26px;
      border-radius: 7px;
      background: #16a34a;
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
      font-weight: 900;
      flex-shrink: 0;
      box-shadow: 0 1px 3px rgba(22, 163, 74, 0.25);
    }

    .visual-preview {
      width: 38px;
      height: 38px;
      border-radius: 8px;
      border: 1px solid #cbd5e1;
      overflow: hidden;
      flex-shrink: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      background: #e2e8f0;
    }

    .clue-text {
      flex: 1;
      font-size: 14px;
      font-weight: 700;
      color: #1e2945;
      line-height: 1.25;
    }

    .clue-sub {
      font-size: 12px;
      font-weight: 500;
      color: #64748b;
      margin-top: 1px;
    }

    /* Visual 1: Layers */
    .vis-layers {
      width: 100%;
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .vis-layers div:nth-child(1) { height: 30%; background: #d97706; }
    .vis-layers div:nth-child(2) { height: 40%; background: #fde68a; }
    .vis-layers div:nth-child(3) { height: 30%; background: #b45309; }

    /* Visual 2: Rounded Grains */
    .vis-grains {
      width: 100%;
      height: 100%;
      background: #fef3c7;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      padding: 3px;
      gap: 2px;
      align-items: center;
      justify-items: center;
    }
    .grain {
      width: 7px;
      height: 7px;
      background: #d97706;
      border-radius: 50%;
    }

    /* Visual 3: Porous + Fossil */
    .vis-fossil {
      width: 100%;
      height: 100%;
      background: #e7e5e4;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
    }

    /* Verdict Badge */
    .verdict-badge {
      background: #16a34a;
      color: #ffffff;
      padding: 12px 14px;
      border-radius: 12px;
      text-align: center;
      box-shadow: 0 4px 10px rgba(22, 163, 74, 0.2);
      display: flex;
      flex-direction: column;
      gap: 2px;
    }

    .verdict-label {
      font-size: 11px;
      font-weight: 800;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      opacity: 0.9;
    }

    .verdict-main {
      font-size: 15px;
      font-weight: 800;
    }

    .verdict-examples {
      font-size: 12px;
      font-weight: 600;
      opacity: 0.92;
    }
  </style>
</head>
<body>

  <header class="header">
    <div class="title">
      <span>🔍</span> Rock Detective: Sedimentary Clues
    </div>
  </header>

  <main class="clue-list">
    
    <div class="clue-item active">
      <div class="checkbox">✓</div>
      <div class="visual-preview" title="Visible Layers">
        <div class="vis-layers">
          <div></div>
          <div></div>
          <div></div>
        </div>
      </div>
      <div class="clue-text">
        Visible Layers / Bands
        <div class="clue-sub">Stacked sediment strata</div>
      </div>
    </div>

    
    <div class="clue-item active">
      <div class="checkbox">✓</div>
      <div class="visual-preview" title="Rounded Grains">
        <div class="vis-grains">
          <div class="grain"></div>
          <div class="grain"></div>
          <div class="grain"></div>
          <div class="grain"></div>
          <div class="grain"></div>
          <div class="grain"></div>
        </div>
      </div>
      <div class="clue-text">
        Rounded Grains
        <div class="clue-sub">Visible or gritty to feel</div>
      </div>
    </div>

    
    <div class="clue-item active">
      <div class="checkbox">✓</div>
      <div class="visual-preview" title="Porous Texture or Fossils">
        <div class="vis-fossil">🐚</div>
      </div>
      <div class="clue-text">
        Crumbly / Porous Texture
        <div class="clue-sub">Tiny gaps or shell fossils</div>
      </div>
    </div>
  </main>

  <footer class="verdict-badge">
    <div class="verdict-label">Verdict</div>
    <div class="verdict-main">Sedimentary Rock</div>
    <div class="verdict-examples">(Sandstone / Limestone)</div>
  </footer>

</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;
      color: #1e2945;
      background: #ffffff;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      user-select: none;
    }

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

    .scene {
      position: relative;
      width: 100%;
      height: 250px;
      display: flex;
      gap: 12px;
    }

    /* Time arrow sidebar */
    .timeline {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      width: 42px;
      padding: 8px 0;
      flex-shrink: 0;
    }

    .arrow-container {
      position: relative;
      flex: 1;
      width: 4px;
      background: #cbd5e1;
      border-radius: 2px;
      margin: 6px 0;
    }

    .arrow-head {
      position: absolute;
      top: -6px;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 0;
      border-left: 5px solid transparent;
      border-right: 5px solid transparent;
      border-bottom: 8px solid #64748b;
    }

    .time-label {
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: #64748b;
      writing-mode: vertical-rl;
      transform: rotate(180deg);
      margin: auto 0;
    }

    /* Cliff strata container */
    .cliff-face {
      flex: 1;
      position: relative;
      display: flex;
      flex-direction: column;
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid #e6e6e6;
      box-shadow: 0 4px 12px rgba(30, 41, 69, 0.05);
    }

    .stratum {
      flex: 1;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 16px;
      cursor: pointer;
      transition: filter 0.2s ease, opacity 0.2s ease;
    }

    .stratum:not(:last-child) {
      border-bottom: 2px dashed rgba(30, 41, 69, 0.15);
    }

    /* Layer Textures & Colors */
    .layer-sandstone {
      background: #fdf3c7;
      background-image: radial-gradient(#d97706 0.75px, transparent 0.75px), radial-gradient(#d97706 0.75px, #fdf3c7 0.75px);
      background-size: 12px 12px;
      background-position: 0 0, 6px 6px;
    }

    .layer-siltstone {
      background: #fed7aa;
      background-image: repeating-linear-gradient(0deg, transparent, transparent 6px, rgba(194, 65, 12, 0.15) 6px, rgba(194, 65, 12, 0.15) 8px);
    }

    .layer-shale {
      background: #64748b;
      background-image: repeating-linear-gradient(0deg, #475569, #475569 2px, #334155 2px, #334155 4px);
    }

    /* Badges */
    .rock-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 5px 10px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 700;
      box-shadow: 0 2px 4px rgba(0,0,0,0.08);
      z-index: 2;
    }

    .badge-sandstone {
      background: #fffbeb;
      color: #92400e;
      border: 1px solid #fcd34d;
    }

    .badge-siltstone {
      background: #fff7ed;
      color: #9a3412;
      border: 1px solid #fdba74;
    }

    .badge-shale {
      background: #f8fafc;
      color: #1e2945;
      border: 1px solid #94a3b8;
    }

    .age-pill {
      font-size: 11px;
      font-weight: 700;
      padding: 4px 8px;
      border-radius: 20px;
      text-transform: uppercase;
      letter-spacing: 0.3px;
      white-space: nowrap;
      z-index: 2;
    }

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

    .pill-oldest {
      background: #f1f5f9;
      color: #475569;
      border: 1px solid #cbd5e1;
    }

    /* Active Highlight States */
    .stratum.active {
      filter: brightness(1.05);
      outline: 2px solid #22b7ff;
      outline-offset: -2px;
    }
  </style>
</head>
<body>

  <div class="cliff-card">
    <div class="scene">
      
      <div class="timeline">
        <div class="arrow-head"></div>
        <div class="arrow-container"></div>
        <div class="time-label">Time</div>
      </div>

      
      <div class="cliff-face" id="cliff">
        
        <div class="stratum layer-sandstone" data-index="0">
          <span class="rock-badge badge-sandstone">Sandstone</span>
          <span class="age-pill pill-newest">Newest on top</span>
        </div>

        
        <div class="stratum layer-siltstone" data-index="1">
          <span class="rock-badge badge-siltstone">Siltstone</span>
        </div>

        
        <div class="stratum layer-shale" data-index="2">
          <span class="rock-badge badge-shale">Shale</span>
          <span class="age-pill pill-oldest">Oldest at bottom</span>
        </div>
      </div>
    </div>
  </div>

  <script>
    const strata = document.querySelectorAll('.stratum');
    strata.forEach((layer) => {
      layer.addEventListener('click', () => {
        strata.forEach(l => l.classList.remove('active'));
        layer.classList.add('active');
      });
    });
  </script>
</body>
</html>

science.ks2.y1.t3.s1

Aligned learning resources

Related diagrams