<!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;
      min-height: 100%;
      padding: 12px 10px;
      user-select: none;
      -webkit-user-select: none;
    }

    .toolbar {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 6px;
      width: 100%;
      max-width: 580px;
      margin-bottom: 6px;
    }

    .tooth-btn {
      appearance: none;
      border: 2px solid transparent;
      background: #f1f5f9;
      color: #475569;
      font-size: 13px;
      font-weight: 700;
      padding: 6px 10px;
      border-radius: 20px;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: all 0.2s ease;
    }

    .tooth-btn .dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      display: inline-block;
    }

    .tooth-btn[data-group="incisors"] .dot { background: #0284c7; }
    .tooth-btn[data-group="canines"] .dot { background: #ea580c; }
    .tooth-btn[data-group="carnassials"] .dot { background: #7c3aed; }
    .tooth-btn[data-group="molars"] .dot { background: #16a34a; }

    .tooth-btn.active[data-group="incisors"] { background: #e0f2fe; color: #0369a1; border-color: #0284c7; }
    .tooth-btn.active[data-group="canines"] { background: #ffedd5; color: #c2410c; border-color: #ea580c; }
    .tooth-btn.active[data-group="carnassials"] { background: #ede9fe; color: #6d28d9; border-color: #7c3aed; }
    .tooth-btn.active[data-group="molars"] { background: #dcfce7; color: #15803d; border-color: #16a34a; }

    .svg-container {
      width: 100%;
      max-width: 600px;
      aspect-ratio: 16 / 9;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

    /* Skull bone styling */
    .bone { fill: #f1f5f9; stroke: #94a3b8; stroke-width: 2.2; stroke-linejoin: round; }
    .bone-detail { fill: none; stroke: #cbd5e1; stroke-width: 1.5; stroke-linecap: round; }
    .orbit { fill: #e2e8f0; stroke: #94a3b8; stroke-width: 2; }
    
    /* Base teeth styling */
    .tooth {
      stroke-width: 1.8;
      transition: fill 0.25s ease, stroke 0.25s ease, filter 0.25s ease, opacity 0.25s ease;
      cursor: pointer;
    }

    /* Incisors (Teal/Sky) */
    .tooth.incisor { fill: #bae6fd; stroke: #0284c7; }
    .tooth.incisor.highlight { fill: #38bdf8; stroke: #0369a1; filter: drop-shadow(0 0 4px rgba(2,132,199,0.6)); }

    /* Canines (Orange) */
    .tooth.canine { fill: #fed7aa; stroke: #ea580c; }
    .tooth.canine.highlight { fill: #fb923c; stroke: #c2410c; filter: drop-shadow(0 0 5px rgba(234,88,12,0.7)); }

    /* Carnassial pair (Purple) */
    .tooth.carnassial { fill: #ddd6fe; stroke: #7c3aed; }
    .tooth.carnassial.highlight { fill: #a78bfa; stroke: #6d28d9; filter: drop-shadow(0 0 5px rgba(124,58,237,0.7)); }

    /* Molars (Green) */
    .tooth.molar { fill: #bbf7d0; stroke: #16a34a; }
    .tooth.molar.highlight { fill: #4ade80; stroke: #15803d; filter: drop-shadow(0 0 4px rgba(22,163,74,0.6)); }

    /* Dimmed non-selected */
    .dimmed { opacity: 0.35; }

    /* Callout labels & pointers */
    .callout {
      transition: opacity 0.25s ease, transform 0.25s ease;
      font-family: inherit;
    }
    .callout.inactive { opacity: 0.25; }
    .callout.active { opacity: 1; }

    .callout-line {
      fill: none;
      stroke-width: 1.8;
      stroke-dasharray: 4 2;
    }
    .callout-dot { r: 3.5; }

    .tag-bg { rx: 6; ry: 6; }
    .tag-title { font-size: 11.5px; font-weight: 800; fill: #ffffff; text-anchor: middle; }
    .tag-sub { font-size: 10px; font-weight: 600; text-anchor: middle; }

    /* Quick status / caption bar at bottom */
    .caption-card {
      width: 100%;
      max-width: 580px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 8px 14px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      min-height: 48px;
    }

    .caption-text {
      font-size: 13px;
      font-weight: 600;
      color: #334155;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .caption-badge {
      font-size: 11px;
      font-weight: 800;
      padding: 2px 8px;
      border-radius: 6px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      white-space: nowrap;
    }

    .scissor-icon {
      font-size: 15px;
      vertical-align: middle;
      display: inline-block;
    }
  </style>
</head>
<body>

  
  <div class="toolbar" id="toolbar">
    <button class="tooth-btn active" data-group="all">All Teeth</button>
    <button class="tooth-btn" data-group="incisors"><span class="dot"></span>Incisors</button>
    <button class="tooth-btn" data-group="canines"><span class="dot"></span>Canines</button>
    <button class="tooth-btn" data-group="carnassials"><span class="dot"></span>Carnassials ✂️</button>
    <button class="tooth-btn" data-group="molars"><span class="dot"></span>Molars</button>
  </div>

  
  <div class="svg-container">
    <svg viewBox="0 0 600 310">
      <defs>
        <filter id="shadow" x="-5%" y="-5%" width="110%" height="110%">
          <feDropShadow dx="0" dy="2" stdDeviation="2" flood-color="#000" flood-opacity="0.08"/>
        </filter>
      </defs>

      
      <g filter="url(#shadow)">
        
        <path class="bone" d="
          M 118 168
          C 116 162, 122 152, 138 144
          C 170 130, 240 126, 290 120
          C 340 114, 380 94, 430 76
          C 470 62, 506 72, 520 98
          C 530 118, 524 146, 502 166
          C 480 182, 452 186, 420 186
          C 382 186, 360 174, 340 178
          C 310 184, 270 190, 236 190
          L 122 190
          C 114 188, 112 178, 118 168 Z
        " />

        
        <path class="orbit" d="M 364 122 C 388 116, 412 128, 410 148 C 408 164, 382 170, 360 162 C 348 156, 350 126, 364 122 Z" />
        <path class="bone" d="M 346 166 C 380 180, 430 180, 464 154 L 468 164 C 428 194, 372 192, 338 174 Z" />

        
        <path class="bone" d="
          M 120 196
          L 230 196
          C 278 198, 330 200, 380 206
          C 426 212, 456 220, 478 200
          C 490 190, 498 174, 502 188
          C 506 206, 492 236, 460 252
          C 420 266, 350 248, 280 236
          C 220 226, 150 216, 120 208
          C 114 204, 114 198, 120 196 Z
        " />

        
        <path class="bone-detail" d="M 230 144 C 270 140, 310 138, 342 136" />
        <path class="bone-detail" d="M 148 168 C 190 168, 230 172, 270 172" />
        <path class="bone-detail" d="M 440 84 C 470 94, 494 116, 504 140" />
      </g>

      

      
      <g id="teeth-incisors">
        
        <path class="tooth incisor" d="M 122 188 L 120 198 L 126 198 L 127 188 Z" />
        <path class="tooth incisor" d="M 128 188 L 127 199 L 133 199 L 134 188 Z" />
        <path class="tooth incisor" d="M 135 188 L 135 200 L 141 200 L 142 188 Z" />
        
        <path class="tooth incisor" d="M 121 198 L 119 189 L 125 189 L 126 198 Z" />
        <path class="tooth incisor" d="M 127 198 L 126 188 L 132 188 L 133 198 Z" />
        <path class="tooth incisor" d="M 134 198 L 134 187 L 140 187 L 141 198 Z" />
      </g>

      
      <g id="teeth-canines">
        
        <path class="tooth canine" d="M 146 186 C 147 202, 154 224, 160 228 C 163 226, 164 212, 162 186 Z" />
        
        <path class="tooth canine" d="M 142 200 C 141 184, 145 166, 150 160 C 153 164, 155 178, 154 200 Z" />
      </g>

      
      <g id="teeth-premolars">
        <path class="tooth bone" style="fill:#e2e8f0; stroke:#64748b;" d="M 170 189 L 175 198 L 180 189 Z" />
        <path class="tooth bone" style="fill:#e2e8f0; stroke:#64748b;" d="M 184 189 L 190 200 L 198 189 Z" />
        <path class="tooth bone" style="fill:#e2e8f0; stroke:#64748b;" d="M 166 199 L 171 191 L 176 199 Z" />
        <path class="tooth bone" style="fill:#e2e8f0; stroke:#64748b;" d="M 180 199 L 186 190 L 194 199 Z" />
      </g>

      
      <g id="teeth-carnassials">
        
        <path class="tooth carnassial" d="M 204 188 L 210 207 L 220 202 L 228 206 L 230 188 Z" />
        
        <path class="tooth carnassial" d="M 198 200 L 206 186 L 216 194 L 224 188 L 226 200 Z" />
      </g>

      
      <g id="teeth-molars">
        
        <path class="tooth molar" d="M 234 189 L 236 198 L 244 198 L 246 189 Z" />
        <path class="tooth molar" d="M 248 189 L 250 196 L 256 196 L 257 189 Z" />
        
        <path class="tooth molar" d="M 230 200 L 232 192 L 240 192 L 242 200 Z" />
        <path class="tooth molar" d="M 244 200 L 246 194 L 252 194 L 254 200 Z" />
      </g>


      

      
      <g class="callout" id="callout-incisors">
        <polyline class="callout-line" stroke="#0284c7" points="130,186 130,70 100,70" />
        <circle class="callout-dot" fill="#0284c7" cx="130" cy="186" />
        <g transform="translate(14, 52)">
          <rect class="tag-bg" width="90" height="34" fill="#0284c7" />
          <text class="tag-title" x="45" y="16">INCISORS</text>
          <text class="tag-sub" x="45" y="27" fill="#e0f2fe">Nibble meat</text>
        </g>
      </g>

      
      <g class="callout" id="callout-canines">
        <polyline class="callout-line" stroke="#ea580c" points="160,228 160,268 185,268" />
        <circle class="callout-dot" fill="#ea580c" cx="160" cy="228" />
        <g transform="translate(180, 250)">
          <rect class="tag-bg" width="94" height="34" fill="#ea580c" />
          <text class="tag-title" x="47" y="16">CANINES</text>
          <text class="tag-sub" x="47" y="27" fill="#ffedd5">Pierce &amp; hold</text>
        </g>
      </g>

      
      <g class="callout" id="callout-carnassials">
        <polyline class="callout-line" stroke="#7c3aed" points="216,186 216,36 245,36" />
        <circle class="callout-dot" fill="#7c3aed" cx="216" cy="186" />
        <g transform="translate(240, 18)">
          <rect class="tag-bg" width="136" height="36" fill="#7c3aed" />
          <text class="tag-title" x="68" y="16">CARNASSIALS ✂️</text>
          <text class="tag-sub" x="68" y="28" fill="#ede9fe">Shear like scissors</text>
        </g>
      </g>

      
      <g class="callout" id="callout-molars">
        <polyline class="callout-line" stroke="#16a34a" points="248,202 248,268 310,268" />
        <circle class="callout-dot" fill="#16a34a" cx="248" cy="202" />
        <g transform="translate(305, 250)">
          <rect class="tag-bg" width="105" height="34" fill="#16a34a" />
          <text class="tag-title" x="52" y="16">MOLARS</text>
          <text class="tag-sub" x="52" y="27" fill="#dcfce7">Crush &amp; grind</text>
        </g>
      </g>

    </svg>
  </div>

  
  <div class="caption-card" id="captionCard">
    <div class="caption-text" id="captionText">
      <span class="caption-badge" style="background:#f1f5f9; color:#475569;">WOLF DENTITION</span>
      <span>Carnivore teeth specialized for meat and bone</span>
    </div>
  </div>

  <script>
    const toothData = {
      all: {
        badge: 'WOLF DENTITION',
        badgeBg: '#f1f5f9',
        badgeColor: '#475569',
        text: 'Carnivore teeth specialized for meat and bone'
      },
      incisors: {
        badge: 'INCISORS',
        badgeBg: '#e0f2fe',
        badgeColor: '#0369a1',
        text: 'Small front teeth for nibbling meat off bones'
      },
      canines: {
        badge: 'CANINES',
        badgeBg: '#ffedd5',
        badgeColor: '#c2410c',
        text: 'Large, sharp fangs to pierce and grip prey'
      },
      carnassials: {
        badge: 'CARNASSIALS ✂️',
        badgeBg: '#ede9fe',
        badgeColor: '#6d28d9',
        text: 'Blades shear meat and bone like scissors'
      },
      molars: {
        badge: 'MOLARS',
        badgeBg: '#dcfce7',
        badgeColor: '#15803d',
        text: 'Reduced flat molars crush smaller bone fragments'
      }
    };

    const buttons = document.querySelectorAll('.tooth-btn');
    const allTeeth = document.querySelectorAll('.tooth');
    const allCallouts = document.querySelectorAll('.callout');
    const captionText = document.getElementById('captionText');

    function setActiveGroup(group) {
      // Update button styles
      buttons.forEach(btn => {
        btn.classList.toggle('active', btn.dataset.group === group);
      });

      // Update tooth highlights & opacity
      allTeeth.forEach(t => {
        t.classList.remove('highlight', 'dimmed');
        if (group !== 'all') {
          const isGroupTooth = t.classList.contains(group.slice(0, -1)) || (group === 'carnassials' && t.classList.contains('carnassial'));
          if (isGroupTooth) {
            t.classList.add('highlight');
          } else {
            t.classList.add('dimmed');
          }
        }
      });

      // Update callout opacity
      allCallouts.forEach(c => {
        if (group === 'all') {
          c.classList.remove('inactive');
          c.classList.add('active');
        } else {
          const match = c.id === 'callout-' + group;
          c.classList.toggle('active', match);
          c.classList.toggle('inactive', !match);
        }
      });

      // Update caption
      const data = toothData[group];
      captionText.innerHTML = `
        <span class="caption-badge" style="background:${data.badgeBg}; color:${data.badgeColor};">${data.badge}</span>
        <span>${data.text}</span>
      `;
    }

    buttons.forEach(btn => {
      btn.addEventListener('click', () => {
        setActiveGroup(btn.dataset.group);
      });
    });

    // Make SVG teeth clickable
    document.querySelectorAll('#teeth-incisors .tooth').forEach(el => el.addEventListener('click', () => setActiveGroup('incisors')));
    document.querySelectorAll('#teeth-canines .tooth').forEach(el => el.addEventListener('click', () => setActiveGroup('canines')));
    document.querySelectorAll('#teeth-carnassials .tooth').forEach(el => el.addEventListener('click', () => setActiveGroup('carnassials')));
    document.querySelectorAll('#teeth-molars .tooth').forEach(el => el.addEventListener('click', () => setActiveGroup('molars')));

    // Also callouts clickable
    document.getElementById('callout-incisors').addEventListener('click', () => setActiveGroup('incisors'));
    document.getElementById('callout-canines').addEventListener('click', () => setActiveGroup('canines'));
    document.getElementById('callout-carnassials').addEventListener('click', () => setActiveGroup('carnassials'));
    document.getElementById('callout-molars').addEventListener('click', () => setActiveGroup('molars'));
  </script>
</body>
</html>

Comparing Human and Animal Teeth

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Mammal Teeth & Jaw Comparison</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: #1e293b;
      padding: 10px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      height: 100vh;
      max-height: 600px;
      justify-content: space-between;
    }

    /* 3-column layout */
    .grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      flex: 1;
      min-height: 0;
    }

    @media (max-width: 600px) {
      body {
        height: auto;
        max-height: none;
      }
      .grid {
        grid-template-columns: 1fr;
      }
    }

    /* Comparison Card */
    .col-card {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      padding: 8px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      gap: 6px;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
      overflow: hidden;
    }

    /* Card Header */
    .badge-header {
      text-align: center;
      border-bottom: 1px solid #f1f5f9;
      padding-bottom: 4px;
    }
    .animal-title {
      font-size: 14px;
      font-weight: 700;
      color: #0f172a;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 5px;
    }
    .diet-label {
      font-size: 11px;
      font-weight: 600;
      color: #64748b;
      text-transform: uppercase;
      letter-spacing: 0.4px;
    }

    /* SVG Skull Area */
    .svg-container {
      width: 100%;
      flex: 1;
      min-height: 170px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    svg {
      width: 100%;
      height: 100%;
      max-height: 220px;
      overflow: visible;
    }

    /* SVG Label Styles */
    .callout-line {
      stroke: #64748b;
      stroke-width: 1;
      stroke-dasharray: 2 2;
    }
    .callout-text {
      font-size: 8px;
      font-weight: 600;
      fill: #334155;
      font-family: inherit;
    }
    .callout-sub {
      font-size: 7px;
      font-weight: 500;
      fill: #64748b;
      font-family: inherit;
    }

    /* Jaw Kinematics Box */
    .motion-box {
      width: 100%;
      background: #f1f5f9;
      border: 1px solid #e2e8f0;
      border-radius: 6px;
      padding: 6px 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .motion-icon {
      width: 26px;
      height: 26px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 5px;
      box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
      font-size: 13px;
      color: #2563eb;
      font-weight: 700;
      flex-shrink: 0;
    }
    .motion-text {
      font-size: 11px;
      font-weight: 700;
      color: #1e293b;
      line-height: 1.25;
    }
    .motion-text span {
      font-size: 10px;
      font-weight: 500;
      color: #64748b;
      display: block;
    }

    /* Smooth slow animations (lasting >= 500ms per visible state) */
    .anim-vertical {
      animation: moveVertical 3.2s ease-in-out infinite;
    }
    .anim-horizontal {
      animation: moveHorizontal 3.2s ease-in-out infinite;
    }
    .anim-rotary {
      animation: moveRotary 4s linear infinite;
    }

    @keyframes moveVertical {
      0%, 100% { transform: translateY(-3px); }
      50% { transform: translateY(3px); }
    }
    @keyframes moveHorizontal {
      0%, 100% { transform: translateX(-4px); }
      50% { transform: translateX(4px); }
    }
    @keyframes moveRotary {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }

    /* Lower jaw SVG animations */
    .jaw-carnivore {
      animation: scissorJaw 3.2s ease-in-out infinite;
      transform-origin: 175px 82px;
    }
    .jaw-herbivore {
      animation: grindJaw 3.2s ease-in-out infinite;
      transform-origin: 175px 75px;
    }
    .jaw-omnivore {
      animation: chewJaw 4s ease-in-out infinite;
      transform-origin: 165px 78px;
    }

    @keyframes scissorJaw {
      0%, 100% { transform: rotate(0deg); }
      50% { transform: rotate(5.5deg); }
    }
    @keyframes grindJaw {
      0%, 100% { transform: translateX(-3px); }
      50% { transform: translateX(3px); }
    }
    @keyframes chewJaw {
      0% { transform: translate(0, 0) rotate(0deg); }
      25% { transform: translate(2px, 2px) rotate(1deg); }
      50% { transform: translate(0px, 3px) rotate(0deg); }
      75% { transform: translate(-2px, 1px) rotate(-1deg); }
      100% { transform: translate(0, 0) rotate(0deg); }
    }

    /* Legend Bar */
    .legend {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px 16px;
      padding: 6px 12px;
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
    }
    .legend-item {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 11px;
      font-weight: 600;
      color: #334155;
    }
    .swatch {
      width: 12px;
      height: 12px;
      border-radius: 2px;
      flex-shrink: 0;
      border: 1px solid rgba(0,0,0,0.15);
    }
    .c-incisor { background-color: #10b981; }
    .c-canine { background-color: #f43f5e; }
    .c-molar { background-color: #3b82f6; }
    .c-gap { background-color: #f59e0b; }
  </style>
</head>
<body>

  <div class="grid">
    
    <div class="col-card">
      <div class="badge-header">
        <div class="animal-title"><span>🐺</span> Carnivore (Wolf/Dog)</div>
        <div class="diet-label">Meat Eater</div>
      </div>

      <div class="svg-container">
        <svg viewBox="0 0 210 150">
          <defs>
            <linearGradient id="boneGrad1" x1="0%" y1="0%" x2="100%" y2="100%">
              <stop offset="0%" stop-color="#f8fafc"/>
              <stop offset="100%" stop-color="#e2e8f0"/>
            </linearGradient>
          </defs>

          
          <path d="M 28 85 L 30 76 Q 40 70, 70 70 L 95 62 Q 130 35, 175 48 Q 192 65, 185 85 L 175 85 Q 165 72, 140 70 Q 100 70, 75 80 L 30 85 Z" fill="url(#boneGrad1)" stroke="#64748b" stroke-width="1.5"/>
          
          
          <ellipse cx="120" cy="58" rx="10" ry="8" fill="#cbd5e1" stroke="#94a3b8" stroke-width="1"/>
          
          <path d="M 105 66 Q 135 78, 168 70" fill="none" stroke="#64748b" stroke-width="1.8"/>
          
          <path d="M 140 43 Q 165 40, 180 50" fill="none" stroke="#64748b" stroke-width="1.5"/>

          
          <circle cx="175" cy="82" r="4" fill="#475569" stroke="#ffffff" stroke-width="1"/>

          
          
          <path d="M 28 85 L 30 91 L 33 85 Z" fill="#10b981" stroke="#047857" stroke-width="0.5"/>
          <path d="M 33 85 L 35 91 L 37 85 Z" fill="#10b981" stroke="#047857" stroke-width="0.5"/>
          
          <path d="M 39 84 Q 42 96, 44 104 Q 47 95, 48 83 Z" fill="#f43f5e" stroke="#be123c" stroke-width="0.8"/>
          
          <polygon points="56,83 61,90 66,83" fill="#3b82f6" stroke="#1d4ed8" stroke-width="0.5"/>
          <polygon points="68,82 74,93 80,82 86,91 92,81" fill="#3b82f6" stroke="#1d4ed8" stroke-width="0.8"/> 

          
          <g class="jaw-carnivore">
            
            <path d="M 30 96 L 75 96 Q 130 93, 160 85 L 168 62 Q 176 64, 175 84 L 165 110 Q 115 114, 34 103 Z" fill="url(#boneGrad1)" stroke="#64748b" stroke-width="1.5"/>
            
            <path d="M 30 96 L 32 90 L 34 96 Z" fill="#10b981" stroke="#047857" stroke-width="0.5"/>
            
            <path d="M 35 97 Q 38 86, 40 76 Q 43 87, 44 97 Z" fill="#f43f5e" stroke="#be123c" stroke-width="0.8"/>
            
            <polygon points="55,96 60,90 65,96" fill="#3b82f6" stroke="#1d4ed8" stroke-width="0.5"/>
            <polygon points="67,96 73,85 79,96 85,87 91,95" fill="#3b82f6" stroke="#1d4ed8" stroke-width="0.8"/>
          </g>

          
          
          <line x1="43" y1="104" x2="30" y2="128" class="callout-line"/>
          <circle cx="43" cy="104" r="1.5" fill="#f43f5e"/>
          <text x="5" y="136" class="callout-text" fill="#be123c">Sharp Canines</text>
          <text x="5" y="145" class="callout-sub">(Grip &amp; Tear)</text>

          
          <line x1="82" y1="87" x2="88" y2="128" class="callout-line"/>
          <circle cx="82" cy="87" r="1.5" fill="#1d4ed8"/>
          <text x="75" y="136" class="callout-text" fill="#1d4ed8">Carnassials</text>
          <text x="75" y="145" class="callout-sub">(Shear meat/bone)</text>

          
          <line x1="175" y1="82" x2="160" y2="25" class="callout-line"/>
          <text x="135" y="15" class="callout-text">Strong Hinge</text>
          <text x="135" y="24" class="callout-sub">(Strict vertical lock)</text>
        </svg>
      </div>

      <div class="motion-box">
        <div class="motion-icon anim-vertical">↕</div>
        <div class="motion-text">
          Vertical Motion
          <span>Scissor action (up &amp; down)</span>
        </div>
      </div>
    </div>

    
    <div class="col-card">
      <div class="badge-header">
        <div class="animal-title"><span>🐑</span> Herbivore (Sheep/Cow)</div>
        <div class="diet-label">Plant Eater</div>
      </div>

      <div class="svg-container">
        <svg viewBox="0 0 210 150">
          
          <path d="M 20 82 L 25 76 Q 50 68, 85 64 L 120 52 Q 155 35, 185 55 Q 195 75, 180 85 L 175 80 Q 155 72, 120 72 Q 80 72, 60 82 L 20 82 Z" fill="url(#boneGrad1)" stroke="#64748b" stroke-width="1.5"/>
          
          
          <ellipse cx="140" cy="52" rx="9" ry="8" fill="#cbd5e1" stroke="#94a3b8" stroke-width="1"/>
          
          <path d="M 125 60 Q 150 70, 172 65" fill="none" stroke="#64748b" stroke-width="1.5"/>

          
          <path d="M 20 82 L 48 82" stroke="#f59e0b" stroke-width="3.5" stroke-linecap="round"/>

          
          <rect x="50" y="74" width="38" height="18" fill="#fef3c7" stroke="#f59e0b" stroke-width="1" stroke-dasharray="2 2" rx="2" opacity="0.9"/>
          
          
          <rect x="92" y="78" width="7" height="6" fill="#3b82f6" stroke="#1d4ed8" stroke-width="0.6" rx="0.5"/>
          <line x1="94" y1="81" x2="97" y2="81" stroke="#ffffff" stroke-width="0.8"/>
          <rect x="101" y="78" width="7" height="6" fill="#3b82f6" stroke="#1d4ed8" stroke-width="0.6" rx="0.5"/>
          <line x1="103" y1="81" x2="106" y2="81" stroke="#ffffff" stroke-width="0.8"/>
          <rect x="110" y="78" width="8" height="6" fill="#3b82f6" stroke="#1d4ed8" stroke-width="0.6" rx="0.5"/>
          <line x1="112" y1="81" x2="116" y2="81" stroke="#ffffff" stroke-width="0.8"/>

          
          <g class="jaw-herbivore">
            
            <path d="M 22 93 L 85 93 Q 130 92, 160 85 L 165 65 Q 178 70, 175 85 L 168 116 Q 105 118, 25 99 Z" fill="url(#boneGrad1)" stroke="#64748b" stroke-width="1.5"/>
            
            <polygon points="18,87 23,80 26,92 20,93" fill="#10b981" stroke="#047857" stroke-width="0.6"/>
            <polygon points="26,89 31,81 34,92 28,93" fill="#10b981" stroke="#047857" stroke-width="0.6"/>
            <polygon points="34,91 39,83 42,93 36,94" fill="#10b981" stroke="#047857" stroke-width="0.6"/>
            
            <rect x="92" y="87" width="7" height="6" fill="#3b82f6" stroke="#1d4ed8" stroke-width="0.6" rx="0.5"/>
            <rect x="101" y="87" width="7" height="6" fill="#3b82f6" stroke="#1d4ed8" stroke-width="0.6" rx="0.5"/>
            <rect x="110" y="87" width="8" height="6" fill="#3b82f6" stroke="#1d4ed8" stroke-width="0.6" rx="0.5"/>
          </g>

          
          
          <line x1="32" y1="80" x2="18" y2="28" class="callout-line"/>
          <text x="4" y="16" class="callout-text" fill="#b45309">Dental Pad</text>
          <text x="4" y="25" class="callout-sub">(No upper incisors)</text>

          
          <line x1="24" y1="91" x2="16" y2="128" class="callout-line"/>
          <circle cx="24" cy="91" r="1.5" fill="#047857"/>
          <text x="2" y="136" class="callout-text" fill="#047857">Chisel Incisors</text>
          <text x="2" y="145" class="callout-sub">(Lower crop bite)</text>

          
          <line x1="68" y1="74" x2="72" y2="28" class="callout-line"/>
          <text x="58" y="16" class="callout-text" fill="#b45309">Diastema Gap</text>
          <text x="58" y="25" class="callout-sub">(Tongue sorting)</text>

          
          <line x1="105" y1="94" x2="115" y2="128" class="callout-line"/>
          <circle cx="105" cy="94" r="1.5" fill="#1d4ed8"/>
          <text x="105" y="136" class="callout-text" fill="#1d4ed8">Ridged Molars</text>
          <text x="105" y="145" class="callout-sub">(Grind cellulose)</text>
        </svg>
      </div>

      <div class="motion-box">
        <div class="motion-icon anim-horizontal">↔</div>
        <div class="motion-text">
          Horizontal Motion
          <span>Side-to-side flat grinding</span>
        </div>
      </div>
    </div>

    
    <div class="col-card">
      <div class="badge-header">
        <div class="animal-title"><span>👤</span> Omnivore (Human/Ape)</div>
        <div class="diet-label">Mixed Diet</div>
      </div>

      <div class="svg-container">
        <svg viewBox="0 0 210 150">
          
          <path d="M 42 85 L 42 78 Q 44 65, 75 60 Q 95 32, 140 32 Q 178 35, 175 75 Q 170 85, 155 85 L 145 80 Q 115 75, 80 75 L 42 85 Z" fill="url(#boneGrad1)" stroke="#64748b" stroke-width="1.5"/>
          
          
          <ellipse cx="80" cy="56" rx="10" ry="10" fill="#cbd5e1" stroke="#94a3b8" stroke-width="1"/>
          
          <path d="M 75 66 Q 105 76, 145 70" fill="none" stroke="#64748b" stroke-width="1.5"/>

          
          
          <rect x="43" y="85" width="4" height="6" fill="#10b981" stroke="#047857" stroke-width="0.5" rx="0.5"/>
          <rect x="48" y="85" width="4" height="6" fill="#10b981" stroke="#047857" stroke-width="0.5" rx="0.5"/>
          
          <path d="M 53 85 L 56 93 L 59 85 Z" fill="#f43f5e" stroke="#be123c" stroke-width="0.6"/>
          
          <rect x="61" y="85" width="5" height="5.5" fill="#3b82f6" stroke="#1d4ed8" stroke-width="0.5" rx="1"/>
          <rect x="68" y="85" width="6.5" height="5.5" fill="#3b82f6" stroke="#1d4ed8" stroke-width="0.5" rx="1"/>
          <rect x="76" y="85" width="7" height="5.5" fill="#3b82f6" stroke="#1d4ed8" stroke-width="0.5" rx="1"/>

          
          <g class="jaw-omnivore">
            
            <path d="M 44 98 L 78 98 Q 120 96, 145 88 L 152 68 Q 164 70, 162 88 L 150 112 Q 100 115, 46 106 Z" fill="url(#boneGrad1)" stroke="#64748b" stroke-width="1.5"/>
            
            <rect x="44" y="92" width="4" height="6" fill="#10b981" stroke="#047857" stroke-width="0.5" rx="0.5"/>
            <rect x="49" y="92" width="4" height="6" fill="#10b981" stroke="#047857" stroke-width="0.5" rx="0.5"/>
            
            <path d="M 54 98 L 56 90 L 59 98 Z" fill="#f43f5e" stroke="#be123c" stroke-width="0.6"/>
            
            <rect x="61" y="92" width="5" height="5.5" fill="#3b82f6" stroke="#1d4ed8" stroke-width="0.5" rx="1"/>
            <rect x="68" y="92" width="6.5" height="5.5" fill="#3b82f6" stroke="#1d4ed8" stroke-width="0.5" rx="1"/>
            <rect x="76" y="92" width="7" height="5.5" fill="#3b82f6" stroke="#1d4ed8" stroke-width="0.5" rx="1"/>
          </g>

          
          
          <line x1="46" y1="91" x2="28" y2="128" class="callout-line"/>
          <circle cx="46" cy="91" r="1.5" fill="#047857"/>
          <text x="10" y="136" class="callout-text" fill="#047857">Flat Incisors</text>
          <text x="10" y="145" class="callout-sub">(Biting &amp; Slicing)</text>

          
          <line x1="56" y1="89" x2="65" y2="28" class="callout-line"/>
          <circle cx="56" cy="89" r="1.5" fill="#be123c"/>
          <text x="50" y="16" class="callout-text" fill="#be123c">Blunt Canines</text>
          <text x="50" y="25" class="callout-sub">(Tear &amp; Pierce)</text>

          
          <line x1="75" y1="94" x2="95" y2="128" class="callout-line"/>
          <circle cx="75" cy="94" r="1.5" fill="#1d4ed8"/>
          <text x="88" y="136" class="callout-text" fill="#1d4ed8">Cusped Molars</text>
          <text x="88" y="145" class="callout-sub">(Crush &amp; Grind)</text>
        </svg>
      </div>

      <div class="motion-box">
        <div class="motion-icon anim-rotary">↻</div>
        <div class="motion-text">
          Rotary Movement
          <span>Combined chewing &amp; grinding</span>
        </div>
      </div>
    </div>
  </div>

  
  <div class="legend">
    <div class="legend-item">
      <div class="swatch c-incisor"></div>
      <span>Incisors (Biting / Slicing)</span>
    </div>
    <div class="legend-item">
      <div class="swatch c-canine"></div>
      <span>Canines (Gripping / Tearing)</span>
    </div>
    <div class="legend-item">
      <div class="swatch c-molar"></div>
      <span>Premolars &amp; Molars (Grinding)</span>
    </div>
    <div class="legend-item">
      <div class="swatch c-gap"></div>
      <span>Diastema / Pad (Vegetation sorting)</span>
    </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">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      color: #1e293b;
      background: transparent;
      padding: 8px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }

    .badge-bar {
      display: flex;
      justify-content: center;
      width: 100%;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #eff6ff;
      color: #1d4ed8;
      border: 1px solid #bfdbfe;
      border-radius: 999px;
      padding: 4px 14px;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.2px;
    }

    .main-stage {
      width: 100%;
      max-width: 640px;
      position: relative;
    }

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

    .btn-action {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #ea580c;
      color: #ffffff;
      border: none;
      border-radius: 8px;
      padding: 7px 16px;
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      box-shadow: 0 2px 4px rgba(234, 88, 12, 0.25);
      transition: background-color 0.15s ease;
      user-select: none;
    }
    .btn-action:hover {
      background: #d44907;
    }
    .btn-action:active {
      background: #c2410c;
    }

    /* Animation states */
    .wood-chip {
      opacity: 0;
      transition: opacity 0.2s ease;
    }
    .gnawing .wood-chip {
      opacity: 1;
    }
    .gnawing .chip-1 { animation: chipFly1 0.7s ease-out infinite; }
    .gnawing .chip-2 { animation: chipFly2 0.6s ease-out infinite 0.15s; }
    .gnawing .chip-3 { animation: chipFly3 0.8s ease-out infinite 0.3s; }
    .gnawing .chip-4 { animation: chipFly1 0.65s ease-out infinite 0.45s; }

    @keyframes chipFly1 {
      0% { transform: translate(0, 0) scale(0.7); opacity: 1; }
      100% { transform: translate(14px, 10px) rotate(35deg) scale(1.1); opacity: 0; }
    }
    @keyframes chipFly2 {
      0% { transform: translate(0, 0) scale(0.8); opacity: 1; }
      100% { transform: translate(18px, -6px) rotate(-40deg) scale(1.2); opacity: 0; }
    }
    @keyframes chipFly3 {
      0% { transform: translate(0, 0) scale(0.6); opacity: 1; }
      100% { transform: translate(12px, 14px) rotate(20deg) scale(1); opacity: 0; }
    }

    .gnawing #incisorGroup {
      animation: gnawMotion 0.35s ease-in-out infinite alternate;
      transform-origin: 160px 190px;
    }

    @keyframes gnawMotion {
      0% { transform: translate(0, 0) rotate(0deg); }
      100% { transform: translate(2px, 1.5px) rotate(0.8deg); }
    }

    .gnawing #wearIndicator {
      opacity: 1;
      animation: wearPulse 0.7s ease-in-out infinite alternate;
    }
    #wearIndicator {
      opacity: 0;
      transition: opacity 0.3s ease;
    }
    @keyframes wearPulse {
      0% { stroke-opacity: 0.4; }
      100% { stroke-opacity: 1; }
    }
  </style>
</head>
<body>

  <div class="badge-bar">
    <div class="badge">
      <span>✦</span> Incisors Grow Continuously!
    </div>
  </div>

  <div class="main-stage">
    <svg viewBox="0 0 660 275" aria-label="Beaver Skull and Incisor Cross-Section Diagram">
      <defs>
        <linearGradient id="boneGrad" x1="0" y1="0" x2="1" y2="1">
          <stop offset="0%" stop-color="#f8fafc" />
          <stop offset="100%" stop-color="#e2e8f0" />
        </linearGradient>
        <linearGradient id="enamelGrad" x1="0" y1="0" x2="1" y2="0">
          <stop offset="0%" stop-color="#ea580c" />
          <stop offset="100%" stop-color="#f97316" />
        </linearGradient>
        <linearGradient id="dentinGrad" x1="0" y1="0" x2="1" y2="0">
          <stop offset="0%" stop-color="#fef08a" />
          <stop offset="100%" stop-color="#fef9c3" />
        </linearGradient>
        <linearGradient id="woodGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#a16207" />
          <stop offset="100%" stop-color="#78350f" />
        </linearGradient>
        <filter id="shadow" x="-5%" y="-5%" width="115%" height="115%">
          <feDropShadow dx="1" dy="2" stdDeviation="2" flood-opacity="0.1" />
        </filter>
      </defs>

      
      <path d="M 230,122 L 280,75" stroke="#38bdf8" stroke-width="1.5" stroke-dasharray="3,3" opacity="0.7" />
      <path d="M 230,146 L 280,210" stroke="#38bdf8" stroke-width="1.5" stroke-dasharray="3,3" opacity="0.7" />

      
      <g transform="translate(10, 15)">
        
        <path d="M 40,105 C 40,48 90,28 140,38 C 180,46 200,72 210,100 C 200,120 170,125 155,125 C 135,125 125,115 110,115 C 85,115 70,135 45,125 Z" 
              fill="url(#boneGrad)" stroke="#cbd5e1" stroke-width="2" filter="url(#shadow)" />
        
        <ellipse cx="125" cy="68" rx="14" ry="11" fill="#cbd5e1" opacity="0.7" />
        
        <path d="M 65,130 C 90,130 125,133 150,127 C 170,127 185,140 190,160 C 160,170 110,170 65,150 Z" 
              fill="url(#boneGrad)" stroke="#cbd5e1" stroke-width="2" />
        
        
        <rect x="110" y="107" width="7" height="8" rx="2" fill="#94a3b8" />
        <rect x="120" y="107" width="7" height="8" rx="2" fill="#94a3b8" />
        <rect x="112" y="125" width="7" height="8" rx="2" fill="#94a3b8" />
        <rect x="122" y="125" width="7" height="8" rx="2" fill="#94a3b8" />

        
        <path d="M 195,90 C 205,95 218,120 215,145 L 206,143 C 209,123 200,105 190,97 Z" 
              fill="#ea580c" stroke="#c2410c" stroke-width="1.5" />
        
        <path d="M 180,160 C 195,155 212,145 216,127 L 222,131 C 218,153 198,167 178,167 Z" 
              fill="#ea580c" stroke="#c2410c" stroke-width="1.5" />

        
        <circle cx="210" cy="134" r="22" fill="none" stroke="#0284c7" stroke-width="2" stroke-dasharray="3,3" />

        
        <text x="125" y="195" text-anchor="middle" font-size="12" font-weight="700" fill="#475569">Beaver Skull Anatomy</text>
        <text x="125" y="210" text-anchor="middle" font-size="10.5" font-weight="500" fill="#64748b">Orange iron-reinforced incisors</text>
      </g>

      
      <g transform="translate(280, 10)">
        
        <g id="woodBlock" transform="translate(200, 160)">
          <rect x="0" y="0" width="55" height="70" rx="6" fill="url(#woodGrad)" stroke="#582407" stroke-width="1.5" />
          <path d="M 10,15 C 25,12 40,22 45,18" stroke="#582407" stroke-width="1.5" fill="none" />
          <path d="M 8,38 C 22,33 38,43 48,40" stroke="#582407" stroke-width="1.5" fill="none" />
          <path d="M 12,56 C 24,52 36,60 44,55" stroke="#582407" stroke-width="1.5" fill="none" />
          <text x="27" y="82" text-anchor="middle" font-size="10" font-weight="600" fill="#78350f">Wood Log</text>
          
          
          <circle class="wood-chip chip-1" cx="-6" cy="15" r="3" fill="#ca8a04" />
          <polygon class="wood-chip chip-2" points="-12,28 -5,32 -9,38" fill="#a16207" />
          <circle class="wood-chip chip-3" cx="-14" cy="20" r="2.5" fill="#eab308" />
          <polygon class="wood-chip chip-4" points="-8,45 -3,48 -7,52" fill="#ca8a04" />
        </g>

        
        <g id="incisorGroup">
          
          <path d="M 50,30 C 65,25 105,60 125,105 L 95,110 C 80,75 55,45 50,30 Z" fill="#ffedd5" stroke="#fed7aa" stroke-width="1" />

          
          <path id="dentinLayer" d="M 65,33 C 100,50 150,110 175,188 L 142,210 C 120,145 85,82 55,48 Z" 
                fill="url(#dentinGrad)" stroke="#facc15" stroke-width="1.5" />

          
          <path id="enamelLayer" d="M 163,176 C 147,112 100,48 65,33 L 73,28 C 110,43 160,108 178,185 Z" 
                fill="url(#enamelGrad)" stroke="#c2410c" stroke-width="1.5" />

          
          <path d="M 142,210 L 178,185" stroke="#c2410c" stroke-width="2.5" stroke-linecap="round" />
          
          <path id="wearIndicator" d="M 142,210 L 178,185" stroke="#ef4444" stroke-width="4" stroke-linecap="round" />
        </g>

        
        <g id="enamelCallout">
          <line x1="148" y1="92" x2="198" y2="65" stroke="#ea580c" stroke-width="1.5" />
          <circle cx="148" cy="92" r="3.5" fill="#ea580c" />
          <text x="204" y="62" font-size="12.5" font-weight="700" fill="#c2410c">Hard Enamel (Front)</text>
          <text x="204" y="78" font-size="10.5" font-weight="600" fill="#9a3412">Iron-rich &amp; wears slowly</text>
        </g>

        
        <g id="dentinCallout">
          <line x1="102" y1="110" x2="52" y2="78" stroke="#ca8a04" stroke-width="1.5" />
          <circle cx="102" cy="110" r="3.5" fill="#ca8a04" />
          <text x="46" y="74" text-anchor="end" font-size="12.5" font-weight="700" fill="#854d0e">Softer Dentin (Back)</text>
          <text x="46" y="90" text-anchor="end" font-size="10.5" font-weight="600" fill="#a16207">Wears away faster</text>
        </g>

        
        <g id="tipCallout">
          <line x1="156" y1="202" x2="124" y2="230" stroke="#0284c7" stroke-width="1.5" />
          <circle cx="156" cy="202" r="3.5" fill="#0284c7" />
          <text x="116" y="232" text-anchor="end" font-size="12.5" font-weight="700" fill="#0369a1">Sharp Chisel Edge</text>
          <text x="116" y="247" text-anchor="end" font-size="10.5" font-weight="600" fill="#0284c7">Self-sharpening bevel</text>
        </g>
      </g>
    </svg>
  </div>

  <button class="btn-action" id="gnawBtn" onclick="toggleGnaw()">
    <span id="btnIcon">🪵</span> <span id="btnText">Simulate Gnawing</span>
  </button>

  <script>
    let isGnawing = false;

    function toggleGnaw() {
      const stage = document.querySelector('.main-stage');
      const btnText = document.getElementById('btnText');
      const btnIcon = document.getElementById('btnIcon');
      
      isGnawing = !isGnawing;

      if (isGnawing) {
        stage.classList.add('gnawing');
        btnText.textContent = "Stop Gnawing";
        btnIcon.textContent = "⏸";
      } else {
        stage.classList.remove('gnawing');
        btnText.textContent = "Simulate Gnawing";
        btnIcon.textContent = "🪵";
      }
    }
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="1:1">
  <title>Human Dental Arch</title>
  <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;
      width: 100%;
      min-height: 100%;
      padding: 12px 10px 10px;
      user-select: none;
      -webkit-user-select: none;
    }

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

    .svg-container {
      width: 100%;
      max-width: 320px;
      aspect-ratio: 1 / 0.95;
      position: relative;
    }

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

    /* Tooth Zone Styling */
    .tooth-group {
      cursor: pointer;
      transition: opacity 0.25s ease, filter 0.25s ease;
    }

    .tooth {
      stroke-width: 1.5;
      stroke: #ffffff;
      transition: filter 0.2s ease, stroke 0.2s ease;
    }

    .incisor { fill: #06b6d4; }
    .canine { fill: #eab308; }
    .premolar { fill: #f97316; }
    .molar { fill: #10b981; }

    /* Dimming & Highlighting */
    .svg-container.filter-active .tooth-group {
      opacity: 0.28;
    }
    .svg-container.filter-active .tooth-group.active {
      opacity: 1;
      filter: drop-shadow(0 0 6px rgba(0,0,0,0.25));
    }
    .svg-container.filter-active .tooth-group.active .tooth {
      stroke: #0f172a;
      stroke-width: 2;
    }

    /* Tool Callout Badges on Arch */
    .arch-icon {
      font-size: 16px;
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15));
      pointer-events: none;
    }

    /* Direction label */
    .arch-label {
      font-size: 11px;
      font-weight: 700;
      letter-spacing: 0.5px;
      fill: #94a3b8;
      text-anchor: middle;
    }

    /* Grid of 4 Tooth Cards */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 8px;
      width: 100%;
    }

    .card-btn {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 7px 10px;
      background: #f8fafc;
      border: 2px solid transparent;
      border-radius: 10px;
      cursor: pointer;
      box-shadow: 0 1px 3px rgba(0,0,0,0.06);
      transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .card-btn:active {
      transform: translateY(1px);
    }

    .card-btn.incisors-card { border-color: #06b6d4; }
    .card-btn.canines-card { border-color: #eab308; }
    .card-btn.premolars-card { border-color: #f97316; }
    .card-btn.molars-card { border-color: #10b981; }

    .card-btn.active {
      box-shadow: 0 3px 10px rgba(0,0,0,0.12);
      background: #ffffff;
    }
    .card-btn.active.incisors-card { background: #ecfeff; }
    .card-btn.active.canines-card { background: #fefce8; }
    .card-btn.active.premolars-card { background: #fff7ed; }
    .card-btn.active.molars-card { background: #f0fdf4; }

    .card-icon {
      font-size: 18px;
      line-height: 1;
    }

    .card-info {
      display: flex;
      flex-direction: column;
      line-height: 1.15;
    }

    .card-title {
      font-size: 13px;
      font-weight: 700;
      color: #0f172a;
    }

    .card-action {
      font-size: 12px;
      font-weight: 600;
    }

    .incisors-text { color: #0891b2; }
    .canines-text { color: #ca8a04; }
    .premolars-text { color: #ea580c; }
    .molars-text { color: #059669; }
  </style>
</head>
<body>

  <div class="main-wrap">
    
    <div class="svg-container" id="svgContainer">
      <svg viewBox="0 0 320 295">
        
        <path d="M 54,282 C 46,145 84,34 160,34 C 236,34 274,145 266,282" 
              fill="none" stroke="#fce7f3" stroke-width="48" stroke-linecap="round" />
        <path d="M 54,282 C 46,145 84,34 160,34 C 236,34 274,145 266,282" 
              fill="none" stroke="#fbcfe8" stroke-width="36" stroke-linecap="round" />

        
        <text x="160" y="16" class="arch-label">▲ FRONT (LIP)</text>
        <text x="160" y="284" class="arch-label">▼ BACK (THROAT)</text>

        
        <text x="160" y="78" class="arch-icon" text-anchor="middle">✂️</text>
        <text x="96" y="104" class="arch-icon" text-anchor="middle">🍴</text>
        <text x="224" y="104" class="arch-icon" text-anchor="middle">🍴</text>
        <text x="100" y="152" class="arch-icon" text-anchor="middle">🔨</text>
        <text x="220" y="152" class="arch-icon" text-anchor="middle">🔨</text>
        <text x="104" y="240" class="arch-icon" text-anchor="middle">🥣</text>
        <text x="216" y="240" class="arch-icon" text-anchor="middle">🥣</text>

        
        <g class="tooth-group" data-zone="incisors">
          
          <rect class="tooth incisor" x="146" y="25" width="13" height="19" rx="3.5" transform="rotate(-3 152 34)" />
          
          <rect class="tooth incisor" x="161" y="25" width="13" height="19" rx="3.5" transform="rotate(3 168 34)" />
          
          <rect class="tooth incisor" x="127" y="32" width="12" height="17" rx="3" transform="rotate(-15 133 40)" />
          
          <rect class="tooth incisor" x="181" y="32" width="12" height="17" rx="3" transform="rotate(15 187 40)" />
        </g>

        
        <g class="tooth-group" data-zone="canines">
          
          <polygon class="tooth canine" points="107,52 119,45 120,62 108,65" />
          
          <polygon class="tooth canine" points="213,52 201,45 200,62 212,65" />
        </g>

        
        <g class="tooth-group" data-zone="premolars">
          
          <rect class="tooth premolar" x="85" y="70" width="16" height="17" rx="4.5" transform="rotate(-48 93 78)" />
          
          <rect class="tooth premolar" x="219" y="70" width="16" height="17" rx="4.5" transform="rotate(48 227 78)" />
          
          <rect class="tooth premolar" x="69" y="102" width="17" height="18" rx="4.5" transform="rotate(-64 77 111)" />
          
          <rect class="tooth premolar" x="234" y="102" width="17" height="18" rx="4.5" transform="rotate(64 243 111)" />
        </g>

        
        <g class="tooth-group" data-zone="molars">
          
          <rect class="tooth molar" x="55" y="140" width="20" height="21" rx="5" transform="rotate(-78 65 150)" />
          
          <rect class="tooth molar" x="245" y="140" width="20" height="21" rx="5" transform="rotate(78 255 150)" />
          
          <rect class="tooth molar" x="48" y="184" width="21" height="21" rx="5" transform="rotate(-84 58 194)" />
          
          <rect class="tooth molar" x="251" y="184" width="21" height="21" rx="5" transform="rotate(84 262 194)" />
          
          <rect class="tooth molar" x="46" y="228" width="20" height="20" rx="5" transform="rotate(-88 56 238)" />
          
          <rect class="tooth molar" x="254" y="228" width="20" height="20" rx="5" transform="rotate(88 264 238)" />
        </g>
      </svg>
    </div>

    
    <div class="cards-grid">
      <div class="card-btn incisors-card" data-zone="incisors">
        <span class="card-icon">✂️</span>
        <div class="card-info">
          <span class="card-title">4 Incisors</span>
          <span class="card-action incisors-text">Cut & Chisel</span>
        </div>
      </div>

      <div class="card-btn canines-card" data-zone="canines">
        <span class="card-icon">🍴</span>
        <div class="card-info">
          <span class="card-title">2 Canines</span>
          <span class="card-action canines-text">Tear & Grip</span>
        </div>
      </div>

      <div class="card-btn premolars-card" data-zone="premolars">
        <span class="card-icon">🔨</span>
        <div class="card-info">
          <span class="card-title">4 Premolars</span>
          <span class="card-action premolars-text">Crush</span>
        </div>
      </div>

      <div class="card-btn molars-card" data-zone="molars">
        <span class="card-icon">🥣</span>
        <div class="card-info">
          <span class="card-title">6 Molars</span>
          <span class="card-action molars-text">Grind</span>
        </div>
      </div>
    </div>
  </div>

  <script>
    const svgContainer = document.getElementById('svgContainer');
    const toothGroups = document.querySelectorAll('.tooth-group');
    const cards = document.querySelectorAll('.card-btn');

    let activeZone = null;

    function setZone(zone) {
      if (activeZone === zone) {
        // Toggle off if tapping same
        activeZone = null;
      } else {
        activeZone = zone;
      }

      if (activeZone) {
        svgContainer.classList.add('filter-active');
        toothGroups.forEach(tg => {
          tg.classList.toggle('active', tg.getAttribute('data-zone') === activeZone);
        });
        cards.forEach(c => {
          c.classList.toggle('active', c.getAttribute('data-zone') === activeZone);
        });
      } else {
        svgContainer.classList.remove('filter-active');
        toothGroups.forEach(tg => tg.classList.remove('active'));
        cards.forEach(c => c.classList.remove('active'));
      }
    }

    // Attach click & hover events to cards
    cards.forEach(card => {
      const zone = card.getAttribute('data-zone');
      card.addEventListener('click', () => setZone(zone));
      card.addEventListener('mouseenter', () => {
        svgContainer.classList.add('filter-active');
        toothGroups.forEach(tg => tg.classList.toggle('active', tg.getAttribute('data-zone') === zone));
        cards.forEach(c => c.classList.toggle('active', c.getAttribute('data-zone') === zone));
      });
      card.addEventListener('mouseleave', () => {
        if (!activeZone) {
          svgContainer.classList.remove('filter-active');
          toothGroups.forEach(tg => tg.classList.remove('active'));
          cards.forEach(c => c.classList.remove('active'));
        } else {
          setZone(activeZone);
        }
      });
    });

    // Attach click & hover events to SVG tooth groups
    toothGroups.forEach(tg => {
      const zone = tg.getAttribute('data-zone');
      tg.addEventListener('click', () => setZone(zone));
      tg.addEventListener('mouseenter', () => {
        svgContainer.classList.add('filter-active');
        toothGroups.forEach(g => g.classList.toggle('active', g.getAttribute('data-zone') === zone));
        cards.forEach(c => c.classList.toggle('active', c.getAttribute('data-zone') === zone));
      });
      tg.addEventListener('mouseleave', () => {
        if (!activeZone) {
          svgContainer.classList.remove('filter-active');
          toothGroups.forEach(g => g.classList.remove('active'));
          cards.forEach(c => c.classList.remove('active'));
        } else {
          setZone(activeZone);
        }
      });
    });
  </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; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: transparent;
      color: #1e2945;
      width: 100%;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 12px 16px;
      gap: 12px;
      user-select: none;
      -webkit-user-select: none;
    }

    /* Step Navigation */
    .nav-bar {
      display: flex;
      align-items: center;
      gap: 6px;
      width: 100%;
      max-width: 440px;
      justify-content: space-between;
    }
    .step-btn {
      flex: 1;
      padding: 7px 4px;
      font-size: 13px;
      font-weight: 600;
      border: 1px solid #e6e6e6;
      border-radius: 8px;
      background: #f8f9fa;
      color: #64748b;
      cursor: pointer;
      text-align: center;
      transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
    }
    .step-btn:hover {
      background: #f1f5f9;
      color: #1e2945;
    }
    .step-btn.active {
      background: #22b7ff;
      color: #ffffff;
      border-color: #22b7ff;
      box-shadow: 0 2px 6px rgba(34, 183, 255, 0.3);
    }
    .play-btn {
      width: 34px;
      height: 34px;
      flex-shrink: 0;
      border-radius: 8px;
      border: 1px solid #e6e6e6;
      background: #f8f9fa;
      color: #1e2945;
      font-size: 13px;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: background 0.2s;
    }
    .play-btn:hover {
      background: #e2e8f0;
    }

    /* Diagram Stage */
    .stage-container {
      position: relative;
      width: 100%;
      max-width: 440px;
      height: 250px;
      background: transparent;
      border: none;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

    /* Anatomical labels */
    .tooth-label {
      font-size: 13px;
      font-weight: 700;
      fill: #1e2945;
    }
    .saliva-label {
      font-size: 13px;
      font-weight: 700;
      fill: #0369a1;
      opacity: 0;
      transition: opacity 0.35s ease;
    }
    .saliva-line {
      opacity: 0;
      transition: opacity 0.35s ease;
    }
    .saliva-visible .saliva-label,
    .saliva-visible .saliva-line {
      opacity: 1;
    }

    /* Dynamic Tooth Movement */
    .upper-jaw {
      transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .lower-jaw {
      transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    }

    /* Food transformations */
    .food-state {
      transition: opacity 0.4s ease, transform 0.4s ease;
      transform-origin: center;
    }

    /* Saliva drops */
    .saliva-drop {
      fill: #0284c7;
      opacity: 0;
      transition: all 0.5s ease;
    }
    .saliva-visible .saliva-drop {
      opacity: 0.95;
    }

    /* Grinding motion indicators */
    .grind-arrow {
      opacity: 0;
      transition: opacity 0.3s ease;
    }
    .grinding .grind-arrow {
      opacity: 0.95;
    }

    /* Outcome Badge */
    .outcome-badge {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      height: 34px;
      padding: 0 16px;
      border-radius: 20px;
      background: #e0f2fe;
      border: 1px solid #bae6fd;
      color: #0369a1;
      font-size: 13px;
      font-weight: 700;
      opacity: 0;
      transform: translateY(4px);
      transition: opacity 0.3s ease, transform 0.3s ease;
    }
    .outcome-badge.visible {
      opacity: 1;
      transform: translateY(0);
    }

    @media (max-width: 380px) {
      .step-btn {
        font-size: 11.5px;
        padding: 6px 2px;
      }
      .tooth-label {
        font-size: 12px;
      }
      .saliva-label {
        font-size: 12px;
      }
    }
  </style>
</head>
<body>

  
  <div class="nav-bar">
    <button class="step-btn active" onclick="setStep(0)">1. Enter</button>
    <button class="step-btn" onclick="setStep(1)">2. Grind</button>
    <button class="step-btn" onclick="setStep(2)">3. Saliva</button>
    <button class="step-btn" onclick="setStep(3)">4. Paste</button>
    <button class="play-btn" id="playBtn" onclick="togglePlay()" aria-label="Play/Pause">⏸</button>
  </div>

  
  <div class="stage-container" id="stage">
    <svg viewBox="0 0 400 240">
      <defs>
        
        <linearGradient id="toothGrad" x1="0%" y1="0%" x2="0%" y2="100%">
          <stop offset="0%" stop-color="#ffffff"/>
          <stop offset="100%" stop-color="#e2e8f0"/>
        </linearGradient>
        <linearGradient id="gumGrad" x1="0%" y1="0%" x2="0%" y2="100%">
          <stop offset="0%" stop-color="#fda4af"/>
          <stop offset="100%" stop-color="#f43f5e"/>
        </linearGradient>
        <linearGradient id="foodGrad" x1="0%" y1="0%" x2="100%" y2="100%">
          <stop offset="0%" stop-color="#fbbf24"/>
          <stop offset="100%" stop-color="#f97316"/>
        </linearGradient>
      </defs>

      
      <g id="upperJaw" class="upper-jaw" transform="translate(0, 0)">
        
        <path d="M120 15 Q200 8 280 15 L280 40 L120 40 Z" fill="url(#gumGrad)" opacity="0.85"/>
        
        <path d="M135 40 L135 72 Q135 84 150 84 L170 81 Q185 84 200 81 Q215 84 230 81 L250 84 Q265 84 265 72 L265 40 Z" 
              fill="url(#toothGrad)" stroke="#94a3b8" stroke-width="2" stroke-linejoin="round"/>
        
        <line x1="168" y1="62" x2="172" y2="80" stroke="#cbd5e1" stroke-width="2" stroke-linecap="round"/>
        <line x1="200" y1="60" x2="200" y2="80" stroke="#cbd5e1" stroke-width="2" stroke-linecap="round"/>
        <line x1="232" y1="62" x2="228" y2="80" stroke="#cbd5e1" stroke-width="2" stroke-linecap="round"/>
        
        <text x="44" y="65" class="tooth-label">Upper Molar</text>
        <line x1="108" y1="61" x2="130" y2="61" stroke="#64748b" stroke-width="1.5" stroke-dasharray="3,3"/>
      </g>

      
      
      <g id="foodChunk" class="food-state" opacity="1" transform="translate(0, 0)">
        <polygon points="180,112 216,108 226,128 190,135 174,124" fill="url(#foodGrad)" stroke="#ea580c" stroke-width="2" stroke-linejoin="round"/>
        <circle cx="192" cy="120" r="2" fill="#ffffff" opacity="0.6"/>
      </g>

      
      <g id="foodCrushed" class="food-state" opacity="0">
        <polygon points="172,118 184,114 186,124 175,126" fill="#f97316"/>
        <polygon points="190,113 205,112 202,123 189,122" fill="#fbbf24"/>
        <polygon points="209,114 225,116 222,126 207,125" fill="#f97316"/>
        <polygon points="180,126 195,125 192,132 178,131" fill="#fbbf24"/>
        <polygon points="198,125 214,125 212,133 197,132" fill="#f97316"/>
      </g>

      
      <g id="foodMoist" class="food-state" opacity="0">
        <ellipse cx="200" cy="122" rx="26" ry="9" fill="#fde047" opacity="0.95"/>
        <circle cx="185" cy="121" r="5" fill="#f97316"/>
        <circle cx="196" cy="120" r="4.5" fill="#fbbf24"/>
        <circle cx="207" cy="122" r="5.5" fill="#f97316"/>
        <circle cx="216" cy="121" r="3.5" fill="#fbbf24"/>
      </g>

      
      <g id="foodPaste" class="food-state" opacity="0">
        <ellipse cx="200" cy="124" rx="28" ry="11" fill="#38bdf8" opacity="0.35"/>
        <ellipse cx="200" cy="124" rx="24" ry="9" fill="#f59e0b" stroke="#0284c7" stroke-width="2"/>
        <ellipse cx="194" cy="121" rx="8" ry="3" fill="#ffffff" opacity="0.6"/>
      </g>

      
      <g id="salivaGroup">
        
        <text x="314" y="112" class="saliva-label">Saliva 💧</text>
        <line x1="310" y1="108" x2="250" y2="118" class="saliva-line" stroke="#0284c7" stroke-width="1.75" stroke-dasharray="3,3"/>

        
        <circle id="drop1" class="saliva-drop" cx="242" cy="116" r="4.5"/>
        <circle id="drop2" class="saliva-drop" cx="230" cy="122" r="3.5"/>
        <circle id="drop3" class="saliva-drop" cx="162" cy="120" r="3.5"/>
        <circle id="drop4" class="saliva-drop" cx="172" cy="115" r="4"/>
      </g>

      
      <g id="grindArrows" class="grind-arrow">
        <path d="M142 121 L126 121 M131 116 L125 121 L131 126" stroke="#0284c7" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"/>
        <path d="M258 121 L274 121 M269 116 L275 121 L269 126" stroke="#0284c7" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"/>
      </g>

      
      <g id="lowerJaw" class="lower-jaw" transform="translate(0, 0)">
        
        <path d="M135 200 L135 168 Q135 156 150 156 L170 159 Q185 156 200 159 Q215 156 230 159 L250 156 Q265 156 265 168 L265 200 Z" 
              fill="url(#toothGrad)" stroke="#94a3b8" stroke-width="2" stroke-linejoin="round"/>
        
        <line x1="168" y1="178" x2="172" y2="160" stroke="#cbd5e1" stroke-width="2" stroke-linecap="round"/>
        <line x1="200" y1="180" x2="200" y2="160" stroke="#cbd5e1" stroke-width="2" stroke-linecap="round"/>
        <line x1="232" y1="178" x2="228" y2="160" stroke="#cbd5e1" stroke-width="2" stroke-linecap="round"/>
        
        <path d="M120 200 Q200 207 280 200 L280 225 L120 225 Z" fill="url(#gumGrad)" opacity="0.85"/>
        
        <text x="44" y="180" class="tooth-label">Lower Molar</text>
        <line x1="108" y1="176" x2="130" y2="176" stroke="#64748b" stroke-width="1.5" stroke-dasharray="3,3"/>
      </g>
    </svg>
  </div>

  
  <div class="outcome-badge" id="outcomeBadge">
    <span>Ready to swallow safely</span>
    <span>✓</span>
  </div>

  <script>
    let currentStep = 0;
    let isPlaying = true;
    let timer = null;

    const stepButtons = document.querySelectorAll('.step-btn');
    const upperJaw = document.getElementById('upperJaw');
    const lowerJaw = document.getElementById('lowerJaw');
    const stage = document.getElementById('stage');
    const outcomeBadge = document.getElementById('outcomeBadge');
    const playBtn = document.getElementById('playBtn');

    const foodChunk = document.getElementById('foodChunk');
    const foodCrushed = document.getElementById('foodCrushed');
    const foodMoist = document.getElementById('foodMoist');
    const foodPaste = document.getElementById('foodPaste');

    function setStep(index) {
      currentStep = index;

      // Update button UI
      stepButtons.forEach((btn, idx) => {
        btn.classList.toggle('active', idx === currentStep);
      });

      // Reset transforms and flags
      stage.classList.remove('grinding', 'saliva-visible');
      outcomeBadge.classList.remove('visible');

      // Hide all food states
      foodChunk.setAttribute('opacity', '0');
      foodCrushed.setAttribute('opacity', '0');
      foodMoist.setAttribute('opacity', '0');
      foodPaste.setAttribute('opacity', '0');

      if (currentStep === 0) {
        // 1. Food enters (gap open)
        upperJaw.style.transform = 'translate(0px, 0px)';
        lowerJaw.style.transform = 'translate(0px, 0px)';
        foodChunk.setAttribute('opacity', '1');
      } 
      else if (currentStep === 1) {
        // 2. Crush & Grind (teeth meet tightly & shift side-to-side)
        upperJaw.style.transform = 'translate(-8px, 26px)';
        lowerJaw.style.transform = 'translate(8px, -26px)';
        stage.classList.add('grinding');
        foodCrushed.setAttribute('opacity', '1');
      } 
      else if (currentStep === 2) {
        // 3. Saliva mixes in
        upperJaw.style.transform = 'translate(0px, 14px)';
        lowerJaw.style.transform = 'translate(0px, -14px)';
        stage.classList.add('saliva-visible');
        foodMoist.setAttribute('opacity', '1');
      } 
      else if (currentStep === 3) {
        // 4. Smooth paste (ready to swallow)
        upperJaw.style.transform = 'translate(0px, 0px)';
        lowerJaw.style.transform = 'translate(0px, 8px)';
        foodPaste.setAttribute('opacity', '1');
        outcomeBadge.classList.add('visible');
      }
    }

    function nextStep() {
      setStep((currentStep + 1) % 4);
    }

    function startTimer() {
      clearInterval(timer);
      timer = setInterval(nextStep, 3200);
    }

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

    // Initialize
    setStep(0);
    startTimer();
  </script>
</body>
</html>

Why Do We Have Teeth?

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Speech Sound Mouth Shapes</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: transparent;
      color: #1e2945;
      padding: 8px 6px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      min-height: auto;
    }

    .panels-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 16px;
      width: 100%;
      max-width: 620px;
    }

    @media (max-width: 480px) {
      .panels-grid {
        grid-template-columns: 1fr;
        gap: 16px;
      }
    }

    .sound-panel {
      background: transparent;
      padding: 4px 6px;
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
      user-select: none;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 0.5px;
      margin-bottom: 2px;
    }

    .badge-teal {
      background: rgba(0, 184, 148, 0.14);
      color: #00876c;
    }

    .badge-blue {
      background: rgba(9, 132, 227, 0.14);
      color: #0984e3;
    }

    .words-label {
      font-size: 12px;
      color: #64748b;
      font-weight: 600;
      margin-bottom: 6px;
    }

    .diagram-svg {
      width: 100%;
      max-width: 260px;
      height: auto;
      display: block;
    }

    .btn-sound {
      margin-top: 8px;
      padding: 6px 14px;
      border-radius: 6px;
      border: 1px solid #cbd5e1;
      background: #ffffff;
      color: #1e2945;
      font-size: 12px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 6px;
      cursor: pointer;
      transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    }

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

    .btn-sound:active {
      background: #e2e8f0;
    }

    /* Gentle, smooth airflow animation with no rapid flicker */
    .air-flow {
      stroke-dasharray: 8, 6;
      animation: airFlowAnim 3s linear infinite;
    }

    @keyframes airFlowAnim {
      from {
        stroke-dashoffset: 0;
      }
      to {
        stroke-dashoffset: -28;
      }
    }

    .label-text {
      font-size: 9.5px;
      font-weight: 700;
      fill: #1e2945;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }
  </style>
</head>
<body>

  <div class="panels-grid">
    
    <div class="sound-panel" id="panelTh">
      <span class="badge badge-teal">"TH" SOUND</span>
      <span class="words-label">think · teeth</span>
      
      <svg class="diagram-svg" viewBox="0 0 220 145" aria-label="Tongue touching between teeth for TH sound">
        <defs>
          <marker id="arrowTeal" viewBox="0 0 6 6" refX="5" refY="3" markerWidth="4" markerHeight="4" orient="auto">
            <path d="M0,0 L6,3 L0,6 Z" fill="#00b894" />
          </marker>
        </defs>

        
        <path d="M 40,36 Q 100,36 130,72 Q 100,108 40,108 Z" fill="#fff5f5" />

        
        <path d="M 30,25 Q 70,27 90,29 Q 85,47 72,47 Q 50,42 30,35 Z" fill="#ff7675" opacity="0.85" />
        <path d="M 30,25 Q 65,27 88,32 C 98,34 100,45 92,49 Q 80,49 72,47" fill="none" stroke="#d63031" stroke-width="2" stroke-linecap="round" />

        
        <path d="M 70,45 L 78,45 L 76,69 L 68,69 Z" fill="#ffffff" stroke="#94a3b8" stroke-width="1.8" stroke-linejoin="round" />

        
        <path d="M 30,118 Q 70,116 90,114 Q 85,96 72,96 Q 50,101 30,108 Z" fill="#ff7675" opacity="0.85" />
        <path d="M 30,118 Q 65,116 88,111 C 98,109 100,98 92,94 Q 80,94 72,96" fill="none" stroke="#d63031" stroke-width="2" stroke-linecap="round" />

        
        <path d="M 70,98 L 78,98 L 76,74 L 68,74 Z" fill="#ffffff" stroke="#94a3b8" stroke-width="1.8" stroke-linejoin="round" />

        
        <path d="M 30,82 Q 50,83 65,79 Q 84,74 86,72 Q 84,69 65,65 Q 50,61 30,62 Z" fill="#fd79a8" stroke="#e84393" stroke-width="1.8" />
        
        
        <path class="air-flow" d="M 36,52 Q 60,55 82,64 Q 94,68 120,65" fill="none" stroke="#00b894" stroke-width="2.2" stroke-linecap="round" marker-end="url(#arrowTeal)" />
        <path class="air-flow" d="M 36,92 Q 60,89 82,80 Q 94,76 120,79" fill="none" stroke="#00b894" stroke-width="2.2" stroke-linecap="round" marker-end="url(#arrowTeal)" />

        
        <rect x="88" y="6" width="126" height="22" rx="11" fill="#f0fdf4" stroke="#00b894" stroke-width="1"/>
        <text x="151" y="20.5" text-anchor="middle" class="label-text" fill="#00876c">Tongue between teeth</text>
        <path d="M 125,28 L 88,69" fill="none" stroke="#00b894" stroke-width="1" stroke-dasharray="2,2" />

        <text x="135" y="75" class="label-text" fill="#00876c">Airflow</text>
      </svg>

      <button class="btn-sound" type="button" onclick="playSound('th')" aria-label="Listen to the TH sound">Listen "TH" 🔊</button>
    </div>

    
    <div class="sound-panel" id="panelFv">
      <span class="badge badge-blue">"F" & "V" SOUNDS</span>
      <span class="words-label">fun · van</span>
      
      <svg class="diagram-svg" viewBox="0 0 220 145" aria-label="Top teeth resting on bottom lip for F and V sounds">
        <defs>
          <marker id="arrowBlue" viewBox="0 0 6 6" refX="5" refY="3" markerWidth="4" markerHeight="4" orient="auto">
            <path d="M0,0 L6,3 L0,6 Z" fill="#0984e3" />
          </marker>
        </defs>

        
        <path d="M 40,36 Q 100,36 130,72 Q 100,108 40,108 Z" fill="#fff5f5" />

        
        <path d="M 30,25 Q 70,27 92,29 Q 88,47 75,47 Q 50,42 30,35 Z" fill="#ff7675" opacity="0.85" />
        <path d="M 30,25 Q 65,27 90,32 C 102,34 104,45 94,49 Q 82,49 75,47" fill="none" stroke="#d63031" stroke-width="2" stroke-linecap="round" />

        
        <path d="M 72,45 L 81,45 L 79,73 L 70,73 Z" fill="#ffffff" stroke="#94a3b8" stroke-width="1.8" stroke-linejoin="round" />

        
        <path d="M 58,95 L 66,95 L 64,77 L 56,77 Z" fill="#ffffff" stroke="#94a3b8" stroke-width="1.8" stroke-linejoin="round" />

        
        <path d="M 30,118 Q 60,116 75,112 C 86,108 90,90 78,73 C 72,65 64,82 55,92 Q 40,102 30,108 Z" fill="#ff7675" opacity="0.85" />
        <path d="M 30,118 Q 60,116 75,112 C 88,108 92,88 78,73" fill="none" stroke="#d63031" stroke-width="2" stroke-linecap="round" />

        
        <path d="M 30,79 Q 45,77 52,79 Q 56,83 54,89 Q 42,92 30,91 Z" fill="#fd79a8" stroke="#e84393" stroke-width="1.8" />

        
        <path class="air-flow" d="M 38,57 Q 58,61 72,65 Q 88,69 120,67" fill="none" stroke="#0984e3" stroke-width="2.2" stroke-linecap="round" marker-end="url(#arrowBlue)" />

        
        <rect x="80" y="6" width="134" height="22" rx="11" fill="#eff6ff" stroke="#0984e3" stroke-width="1"/>
        <text x="147" y="20.5" text-anchor="middle" class="label-text" fill="#0984e3">Top teeth on bottom lip</text>
        <path d="M 120,28 L 82,72" fill="none" stroke="#0984e3" stroke-width="1" stroke-dasharray="2,2" />

        <text x="135" y="71" class="label-text" fill="#0984e3">Airflow</text>
      </svg>

      <button class="btn-sound" type="button" onclick="playSound('fv')" aria-label="Listen to the F and V sounds">Listen "F / V" 🔊</button>
    </div>
  </div>

  <script>
    let audioCtx = null;

    function playSound(type) {
      if (!audioCtx) {
        audioCtx = new (window.AudioContext || window.webkitAudioContext)();
      }
      if (audioCtx.state === 'suspended') {
        audioCtx.resume();
      }

      const bufferSize = Math.floor(audioCtx.sampleRate * 0.35);
      const buffer = audioCtx.createBuffer(1, bufferSize, audioCtx.sampleRate);
      const output = buffer.getChannelData(0);

      // Generate soft noise for fricatives
      for (let i = 0; i < bufferSize; i++) {
        output[i] = Math.random() * 2 - 1;
      }

      const whiteNoise = audioCtx.createBufferSource();
      whiteNoise.buffer = buffer;

      const filter = audioCtx.createBiquadFilter();
      const gainNode = audioCtx.createGain();

      if (type === 'th') {
        // High soft fricative
        filter.type = 'bandpass';
        filter.frequency.value = 3500;
        filter.Q.value = 1.2;
        gainNode.gain.setValueAtTime(0.08, audioCtx.currentTime);
        gainNode.gain.exponentialRampToValueAtTime(0.001, audioCtx.currentTime + 0.35);
        
        whiteNoise.connect(filter);
        filter.connect(gainNode);
        gainNode.connect(audioCtx.destination);
        whiteNoise.start();
      } else {
        // F/V fricative + voiced formant
        filter.type = 'highpass';
        filter.frequency.value = 2200;
        gainNode.gain.setValueAtTime(0.12, audioCtx.currentTime);
        gainNode.gain.exponentialRampToValueAtTime(0.001, audioCtx.currentTime + 0.35);
        
        whiteNoise.connect(filter);
        filter.connect(gainNode);
        gainNode.connect(audioCtx.destination);
        whiteNoise.start();

        // Low voice tone for 'V'
        const osc = audioCtx.createOscillator();
        const oscGain = audioCtx.createGain();
        osc.type = 'triangle';
        osc.frequency.setValueAtTime(140, audioCtx.currentTime);
        oscGain.gain.setValueAtTime(0.08, audioCtx.currentTime);
        oscGain.gain.exponentialRampToValueAtTime(0.001, audioCtx.currentTime + 0.35);
        osc.connect(oscGain);
        oscGain.connect(audioCtx.destination);
        osc.start();
        osc.stop(audioCtx.currentTime + 0.35);
      }
    }
  </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; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: #f8f9fa;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 10px;
      padding: 12px;
      min-height: 100vh;
      user-select: none;
    }

    .controls {
      display: flex;
      gap: 8px;
      width: 100%;
      max-width: 400px;
    }

    .toggle-btn {
      flex: 1;
      padding: 9px 12px;
      font-size: 13px;
      font-weight: 700;
      border: 1px solid #d1d5db;
      border-radius: 8px;
      background: #ffffff;
      color: #4b5563;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .toggle-btn:hover {
      background: #f3f4f6;
    }

    .toggle-btn.active {
      background: #0984e3;
      color: #ffffff;
      border-color: #0984e3;
      box-shadow: 0 2px 6px rgba(9, 132, 227, 0.25);
    }

    .diagram-area {
      position: relative;
      width: 100%;
      max-width: 400px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    svg {
      width: 100%;
      height: auto;
      max-height: 270px;
      display: block;
    }

    .profile-skin {
      fill: none;
      stroke: #ff6b6b;
      stroke-width: 4;
      stroke-linecap: round;
      stroke-linejoin: round;
      transition: d 0.4s ease;
    }

    .profile-fill {
      fill: rgba(255, 107, 107, 0.08);
      transition: d 0.4s ease;
    }

    .bone {
      fill: #e2e8f0;
      stroke: #cbd5e1;
      stroke-width: 2;
      transition: transform 0.4s ease;
    }

    .teeth-group {
      transition: opacity 0.35s ease, transform 0.4s ease;
    }

    .support-arrow {
      stroke: #0984e3;
      stroke-width: 2.5;
      stroke-linecap: round;
      fill: none;
      transition: opacity 0.35s ease, transform 0.4s ease;
    }

    .arrow-head {
      fill: #0984e3;
      transition: opacity 0.35s ease;
    }

    .tag {
      position: absolute;
      background: #ffffff;
      padding: 4px 8px;
      border-radius: 6px;
      font-size: 11px;
      font-weight: 700;
      border: 1px solid #e6e6e6;
      box-shadow: 0 2px 5px rgba(0,0,0,0.05);
      pointer-events: none;
      white-space: nowrap;
      transition: all 0.3s ease;
    }

    .tag-frame {
      top: 6px;
      left: 4px;
      border-left: 3px solid #0984e3;
      color: #1e2945;
    }

    .tag-support {
      bottom: 10px;
      left: 4px;
      border-left: 3px solid #ff6b6b;
      color: #1e2945;
    }

    .status-badge {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 13px;
      font-weight: 700;
      color: #0984e3;
      background: #eef6fc;
      padding: 6px 14px;
      border-radius: 20px;
      transition: background-color 0.3s ease, color 0.3s ease;
    }

    .status-badge.collapsed {
      color: #d63031;
      background: #feeaea;
    }
  </style>
</head>
<body>

  <div class="controls">
    <button id="btnWith" class="toggle-btn active" onclick="setMode(true)">
      <span>✦</span> With Teeth
    </button>
    <button id="btnWithout" class="toggle-btn" onclick="setMode(false)">
      <span>✕</span> Without Teeth
    </button>
  </div>

  <div class="diagram-area">
    <div class="tag tag-frame" id="tagFrame">Teeth & Jawbone Frame</div>
    <div class="tag tag-support" id="tagSupport">Supporting Lips & Cheeks</div>

    <svg viewBox="0 0 360 270">
      <defs>
        <marker id="arrow" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
          <path d="M 0 1 L 8 5 L 0 9 z" fill="#0984e3"/>
        </marker>
        <pattern id="hatch" width="10" height="10" patternTransform="rotate(45 0 0)" patternUnits="userSpaceOnUse">
          <line x1="0" y1="0" x2="0" y2="10" stroke="#cbd5e1" stroke-width="1.5" />
        </pattern>
      </defs>

      
      <path class="bone" d="M 120 40 C 160 40 210 65 210 110 C 210 125 195 138 185 145 C 165 152 140 152 120 152 Z" />

      
      <g id="mandibleGroup" style="transform-origin: 130px 140px; transition: transform 0.4s ease;">
        <path class="bone" d="M 130 145 L 140 185 C 145 210 185 215 195 215 C 205 210 205 195 195 185 L 160 175 Z" />
      </g>

      
      <path id="skinFill" class="profile-fill"
        d="M 120 40 C 175 40 230 75 235 110 L 252 135 L 236 142 L 250 162 L 238 178 L 246 208 C 242 230 205 240 170 236 L 120 230 Z" />

      
      <path id="skinLine" class="profile-skin"
        d="M 120 40 C 175 40 230 75 235 110 L 252 135 L 236 142 L 250 162 L 238 178 L 246 208 C 242 230 205 240 170 236" />

      
      <g id="teethGroup" class="teeth-group">
        
        <rect x="186" y="140" width="16" height="15" rx="3" fill="#ffffff" stroke="#0984e3" stroke-width="2" />
        <line x1="194" y1="140" x2="194" y2="155" stroke="#0984e3" stroke-width="1.5" />
        
        
        <rect x="184" y="157" width="16" height="15" rx="3" fill="#ffffff" stroke="#0984e3" stroke-width="2" />
        <line x1="192" y1="157" x2="192" y2="172" stroke="#0984e3" stroke-width="1.5" />
      </g>

      
      <g id="supportArrows" class="support-arrow">
        
        <line x1="205" y1="148" x2="238" y2="148" marker-end="url(#arrow)" />
        
        <line x1="203" y1="165" x2="236" y2="165" marker-end="url(#arrow)" />
        
        <line x1="195" y1="125" x2="225" y2="120" marker-end="url(#arrow)" />
      </g>

      
      <circle cx="218" cy="135" r="3" fill="#ff6b6b" opacity="0.6"/>
      <circle cx="222" cy="180" r="3" fill="#ff6b6b" opacity="0.6"/>
    </svg>
  </div>

  <div class="status-badge" id="statusBadge">
    <span>✓</span> Maintains Facial Shape
  </div>

  <script>
    const supportedSkinLine = "M 120 40 C 175 40 230 75 235 110 L 252 135 L 236 142 L 250 162 L 238 178 L 246 208 C 242 230 205 240 170 236";
    const supportedSkinFill = "M 120 40 C 175 40 230 75 235 110 L 252 135 L 236 142 L 250 162 L 238 178 L 246 208 C 242 230 205 240 170 236 L 120 230 Z";

    const collapsedSkinLine = "M 120 40 C 175 40 230 75 235 110 L 252 135 L 222 142 L 226 155 L 216 166 L 238 194 C 235 220 205 236 170 236";
    const collapsedSkinFill = "M 120 40 C 175 40 230 75 235 110 L 252 135 L 222 142 L 226 155 L 216 166 L 238 194 C 235 220 205 236 170 236 L 120 230 Z";

    function setMode(withTeeth) {
      const btnWith = document.getElementById('btnWith');
      const btnWithout = document.getElementById('btnWithout');
      const skinLine = document.getElementById('skinLine');
      const skinFill = document.getElementById('skinFill');
      const teeth = document.getElementById('teethGroup');
      const arrows = document.getElementById('supportArrows');
      const mandible = document.getElementById('mandibleGroup');
      const statusBadge = document.getElementById('statusBadge');
      const tagSupport = document.getElementById('tagSupport');

      if (withTeeth) {
        btnWith.classList.add('active');
        btnWithout.classList.remove('active');
        
        skinLine.setAttribute('d', supportedSkinLine);
        skinFill.setAttribute('d', supportedSkinFill);
        
        teeth.style.opacity = '1';
        teeth.style.transform = 'translate(0, 0)';
        arrows.style.opacity = '1';
        mandible.style.transform = 'rotate(0deg) translate(0, 0)';
        
        statusBadge.className = 'status-badge';
        statusBadge.innerHTML = '<span>✓</span> Maintains Facial Shape';
        tagSupport.textContent = 'Supporting Lips & Cheeks';
      } else {
        btnWithout.classList.add('active');
        btnWith.classList.remove('active');
        
        skinLine.setAttribute('d', collapsedSkinLine);
        skinFill.setAttribute('d', collapsedSkinFill);
        
        teeth.style.opacity = '0';
        teeth.style.transform = 'scale(0.8)';
        arrows.style.opacity = '0';
        mandible.style.transform = 'rotate(-5deg) translate(-2px, -8px)';
        
        statusBadge.className = 'status-badge collapsed';
        statusBadge.innerHTML = '<span>✕</span> Loss of Lip & Cheek Support';
        tagSupport.textContent = 'Cheeks & Lips Sag Inward';
      }
    }
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <title>Front Teeth: Slicing Action</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: #f8f9fa;
      color: #1e2945;
      width: 100%;
      min-height: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 16px;
      user-select: none;
    }

    /* Top Badges / Labels */
    .header-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 480px;
      gap: 8px;
    }
    .badge {
      background: #ffffff;
      border: 1px solid #e6e6e6;
      border-radius: 20px;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 700;
      color: #1e2945;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .badge-action {
      background: #eff6ff;
      border-color: #bfdbfe;
      color: #1d4ed8;
    }

    /* Interactive Stage Canvas */
    .stage {
      position: relative;
      width: 100%;
      max-width: 480px;
      height: 280px;
      background: #ffffff;
      border-radius: 16px;
      border: 1px solid #e6e6e6;
      overflow: hidden;
      margin: 12px 0;
    }

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

    /* Controls */
    .controls {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      width: 100%;
      max-width: 480px;
    }
    .btn {
      background: #ffffff;
      border: 1px solid #e6e6e6;
      color: #1e2945;
      padding: 8px 16px;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: background 0.15s, border-color 0.15s;
    }
    .btn:active {
      background: #f1f5f9;
    }
    .btn-step.active {
      background: #2563eb;
      color: #ffffff;
      border-color: #2563eb;
    }
  </style>
</head>
<body>

  
  <div class="header-bar">
    <div class="badge">
      <span>🦷</span> Front Teeth (Incisors)
    </div>
    <div class="badge badge-action">
      <span>✂️</span> Action: Slicing / Biting
    </div>
  </div>

  
  <div class="stage">
    <svg class="svg-scene" viewBox="0 0 480 280">
      <defs>
        
        <linearGradient id="gumGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#fda4af" />
          <stop offset="100%" stop-color="#f43f5e" />
        </linearGradient>
        <linearGradient id="toothGrad" x1="0" y1="0" x2="1" y2="1">
          <stop offset="0%" stop-color="#ffffff" />
          <stop offset="100%" stop-color="#e2e8f0" />
        </linearGradient>
        <linearGradient id="appleSkin" x1="0" y1="0" x2="1" y2="1">
          <stop offset="0%" stop-color="#ff4757" />
          <stop offset="100%" stop-color="#dc2626" />
        </linearGradient>
        <linearGradient id="fleshGrad" x1="0" y1="0" x2="1" y2="0">
          <stop offset="0%" stop-color="#fef9c3" />
          <stop offset="100%" stop-color="#fef08a" />
        </linearGradient>
        <filter id="shadow" x="-10%" y="-10%" width="120%" height="120%">
          <feDropShadow dx="0" dy="2" stdDeviation="3" flood-opacity="0.08" />
        </filter>
      </defs>

      
      <g id="scissorGuides" opacity="0.9">
        <path d="M 125,48 L 125,72" stroke="#2563eb" stroke-width="2.5" stroke-linecap="round" marker-end="url(#arrow)" />
        <path d="M 125,232 L 125,208" stroke="#2563eb" stroke-width="2.5" stroke-linecap="round" />
        <polygon points="121,72 129,72 125,78" fill="#2563eb" />
        <polygon points="121,208 129,208 125,202" fill="#2563eb" />
        <text x="140" y="65" font-size="12" font-weight="700" fill="#2563eb">Chisel edge</text>
      </g>

      
      <g id="appleGroup" transform="translate(0, 0)">
        
        <g id="bitePiece" transform="translate(0, 0)">
          <path d="M 120,105 Q 100,108 90,140 Q 100,172 120,175 Z" fill="url(#appleSkin)" stroke="#b91c1c" stroke-width="1.5" />
          <circle cx="106" cy="140" r="3" fill="#78350f" />
        </g>

        
        <g id="mainApple">
          
          <path d="M 120,105 C 150,75 250,75 270,115 C 290,150 280,210 250,225 C 220,240 160,230 120,175 Z" fill="url(#appleSkin)" stroke="#b91c1c" stroke-width="1.5" filter="url(#shadow)" />
          
          <path d="M 120,115 C 145,95 200,100 205,140 C 210,180 150,205 120,165 Z" fill="url(#fleshGrad)" opacity="0.6" />
          
          <path d="M 260,100 Q 280,70 300,75" fill="none" stroke="#78350f" stroke-width="4" stroke-linecap="round" />
          
          <path d="M 280,82 Q 310,70 305,90 Q 285,95 280,82 Z" fill="#22c55e" stroke="#15803d" stroke-width="1" />
        </g>

        
        <line id="cutLine" x1="120" y1="95" x2="120" y2="185" stroke="#ffffff" stroke-width="2.5" stroke-dasharray="4,4" opacity="0" />
      </g>

      
      <g id="upperJaw" transform="translate(0, 0)">
        
        <path d="M 30,20 Q 90,20 135,55 Q 115,80 80,75 L 30,75 Z" fill="url(#gumGrad)" />
        
        <path d="M 100,60 L 133,60 L 126,110 L 114,110 Z" fill="url(#toothGrad)" stroke="#cbd5e1" stroke-width="1.5" filter="url(#shadow)" />
        <line x1="114" y1="110" x2="126" y2="110" stroke="#3b82f6" stroke-width="2.5" stroke-linecap="round" />
      </g>

      
      <g id="lowerJaw" transform="translate(0, 0)">
        
        <path d="M 30,260 Q 90,260 135,225 Q 115,200 80,205 L 30,205 Z" fill="url(#gumGrad)" />
        
        <path d="M 100,220 L 133,220 L 126,170 L 114,170 Z" fill="url(#toothGrad)" stroke="#cbd5e1" stroke-width="1.5" filter="url(#shadow)" />
        <line x1="114" y1="170" x2="126" y2="170" stroke="#3b82f6" stroke-width="2.5" stroke-linecap="round" />
      </g>

      
      <rect x="290" y="225" width="175" height="42" rx="8" fill="#f1f5f9" stroke="#e2e8f0" />
      <text id="stepCaption" x="377" y="250" text-anchor="middle" font-size="13" font-weight="700" fill="#1e2945">1. Position Apple</text>
    </svg>
  </div>

  
  <div class="controls">
    <button class="btn btn-step active" id="btnStep1" onclick="setStep(0)">1. Position</button>
    <button class="btn btn-step" id="btnStep2" onclick="setStep(1)">2. Slice Cut</button>
    <button class="btn btn-step" id="btnStep3" onclick="setStep(2)">3. Piece Bites Off</button>
    <button class="btn" id="btnPlay" onclick="togglePlay()">⏸ Pause</button>
  </div>

  <script>
    let currentStep = 0;
    let isPlaying = true;
    let timer = null;

    const upperJaw = document.getElementById('upperJaw');
    const lowerJaw = document.getElementById('lowerJaw');
    const appleGroup = document.getElementById('appleGroup');
    const bitePiece = document.getElementById('bitePiece');
    const cutLine = document.getElementById('cutLine');
    const stepCaption = document.getElementById('stepCaption');
    const stepButtons = [
      document.getElementById('btnStep1'),
      document.getElementById('btnStep2'),
      document.getElementById('btnStep3')
    ];
    const playBtn = document.getElementById('btnPlay');

    const captions = [
      '1. Position Apple',
      '2. Chisel Teeth Slice',
      '3. Bite Cuts Clean Off'
    ];

    function applyStyles(element, styles) {
      Object.assign(element.style, styles);
    }

    // Set smooth transitions
    [upperJaw, lowerJaw, appleGroup, bitePiece, cutLine].forEach(el => {
      el.style.transition = 'transform 0.6s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.5s ease';
    });

    function renderState(step) {
      stepButtons.forEach((btn, idx) => {
        btn.classList.toggle('active', idx === step);
      });
      stepCaption.textContent = captions[step];

      if (step === 0) {
        // Step 1: Wide open mouth, whole apple approaches
        applyStyles(upperJaw, { transform: 'translateY(-15px)' });
        applyStyles(lowerJaw, { transform: 'translateY(15px)' });
        applyStyles(appleGroup, { transform: 'translateX(35px)' });
        applyStyles(bitePiece, { transform: 'translate(0px, 0px)', opacity: '1' });
        applyStyles(cutLine, { opacity: '0' });
      } else if (step === 1) {
        // Step 2: Front incisors clamp down and slice into the apple skin & flesh
        applyStyles(upperJaw, { transform: 'translateY(28px)' });
        applyStyles(lowerJaw, { transform: 'translateY(-28px)' });
        applyStyles(appleGroup, { transform: 'translateX(-5px)' });
        applyStyles(bitePiece, { transform: 'translate(0px, 0px)', opacity: '1' });
        applyStyles(cutLine, { opacity: '1' });
      } else if (step === 2) {
        // Step 3: Teeth open slightly, cut piece separated and enters mouth
        applyStyles(upperJaw, { transform: 'translateY(0px)' });
        applyStyles(lowerJaw, { transform: 'translateY(0px)' });
        applyStyles(appleGroup, { transform: 'translateX(40px)' });
        applyStyles(bitePiece, { transform: 'translate(-55px, 0px)', opacity: '1' });
        applyStyles(cutLine, { opacity: '0' });
      }
    }

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

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

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

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

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

    // Initialize first state and start loop
    renderState(0);
    startAutoPlay();
  </script>
</body>
</html>

science.ks2.y2.t2.s2

Aligned learning resources

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