Advanced

Tutor model

i62 💰:9.4

i52 💰:7.9

🏆 i67 💰:62.5

i70 💰:125.0

i68 💰:125.0

🏆 i66 💰:75.0

i65 💰:125.0

i63 💰:62.5

i61 💰:75.0

i60 💰:9.4

i60 💰:37.5

i58 💰:62.5

i57 💰:22.5

i57 💰:37.5

i56 💰:45.0

⚡ i55 💰:11.25

i55 💰:37.5

i54 💰:62.5

i52 💰:35.0

i51 💰:37.5

i49 💰:15.0

i49 💰:62.5

i48 💰:11.3

i47 💰:7.5

i44 💰:25.0

i43 💰:37.5

i42 💰:187.5

i40 💰:5.0

i39 💰:100.0

i38 💰:37.5

i37 💰:11.0

i36 💰:187.5

i34 💰:12.5

i33 💰:37.5

i30 💰:1.0

i29 💰:1.5

i28 💰:150.0

i23 💰:20.0

i20 💰:4.0

i18 💰:1.0

i16 💰:25.0

i13 💰:1.5

Keep session private

What would you like to learn?

Override for the tutor's lesson content generation calls. Auto uses the system default (Claude Sonnet 5 for lesson text, Opus 5 for diagrams).

Lesson generation model

System default

i58 💰:18.8

i31 💰:11.0

i25 💰:31.3

Tutoring abilities

Have you ever wondered what is happening when you tap a key and a letter magically appears on the screen?

A computer is made of different pieces working as a team called **hardware**, which are the physical parts you can touch.

<!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>Computer Hardware Parts</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      background-color: #f8f9fa;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 12px;
      gap: 10px;
    }

    /* Top Selector Tabs */
    .nav-bar {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 6px;
      width: 100%;
      max-width: 500px;
    }

    .nav-btn {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 10px;
      padding: 6px 12px;
      font-size: 14px;
      font-weight: 600;
      color: #1e2945;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
      transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
    }

    .nav-btn.active {
      border-color: #22b7ff;
      background-color: #f0f9ff;
      box-shadow: 0 0 0 2px rgba(34, 183, 255, 0.25);
    }

    /* Desk Stage Container */
    .stage {
      position: relative;
      width: 100%;
      max-width: 480px;
      height: 280px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 16px;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .desk-surface {
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 70px;
      background: #f1f5f9;
      border-top: 2px solid #e2e8f0;
    }

    /* Hardware Items */
    .hw-part {
      position: absolute;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: box-shadow 0.25s ease, background-color 0.25s ease;
      user-select: none;
    }

    /* Monitor */
    .part-monitor {
      top: 24px;
      left: 22%;
      width: 44%;
      height: 140px;
      background: #ffffff;
      border: 2px solid #cbd5e1;
      border-radius: 10px;
      box-shadow: 0 2px 6px rgba(0,0,0,0.04);
      z-index: 2;
    }

    .screen-inner {
      width: 86%;
      height: 76%;
      background: #e0f2fe;
      border: 1.5px solid #93c5fd;
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
    }

    .monitor-stand {
      position: absolute;
      bottom: -18px;
      left: 50%;
      transform: translateX(-50%);
      width: 16px;
      height: 18px;
      background: #94a3b8;
    }

    .monitor-base {
      position: absolute;
      bottom: -24px;
      left: 50%;
      transform: translateX(-50%);
      width: 54px;
      height: 6px;
      background: #64748b;
      border-radius: 3px;
    }

    /* Tower / Case */
    .part-tower {
      top: 30px;
      right: 8%;
      width: 18%;
      height: 154px;
      background: #ffffff;
      border: 2px solid #cbd5e1;
      border-radius: 8px;
      box-shadow: 0 2px 6px rgba(0,0,0,0.04);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-around;
      padding: 10px 4px;
      z-index: 2;
    }

    .tower-slot {
      width: 70%;
      height: 4px;
      background: #cbd5e1;
      border-radius: 2px;
    }

    .tower-power {
      width: 14px;
      height: 14px;
      border-radius: 50%;
      background: #22b7ff;
      box-shadow: 0 0 6px rgba(34, 183, 255, 0.6);
    }

    /* Keyboard */
    .part-keyboard {
      bottom: 18px;
      left: 18%;
      width: 48%;
      height: 38px;
      background: #ffffff;
      border: 2px solid #cbd5e1;
      border-radius: 6px;
      box-shadow: 0 2px 5px rgba(0,0,0,0.04);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 3px;
      padding: 3px;
      z-index: 3;
    }

    .key-row {
      display: flex;
      gap: 3px;
      width: 90%;
      height: 6px;
    }

    .key-cap {
      flex: 1;
      background: #e2e8f0;
      border-radius: 1px;
    }

    .key-space {
      flex: 3;
    }

    /* Mouse */
    .part-mouse {
      bottom: 20px;
      right: 20%;
      width: 10%;
      height: 34px;
      background: #ffffff;
      border: 2px solid #cbd5e1;
      border-radius: 12px;
      box-shadow: 0 2px 5px rgba(0,0,0,0.04);
      display: flex;
      flex-direction: column;
      align-items: center;
      padding-top: 4px;
      z-index: 3;
    }

    .mouse-wheel {
      width: 3px;
      height: 6px;
      background: #94a3b8;
      border-radius: 2px;
    }

    /* Active Highlight States */
    .hw-part.active {
      border-color: #22b7ff;
      box-shadow: 0 0 0 3px rgba(34, 183, 255, 0.4), 0 4px 12px rgba(34, 183, 255, 0.15);
      background-color: #f0f9ff;
    }

    /* Status Info Badge */
    .info-badge {
      font-size: 15px;
      font-weight: 700;
      color: #0369a1;
      background: #e0f2fe;
      border: 1px solid #bae6fd;
      padding: 6px 16px;
      border-radius: 20px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
  </style>
</head>
<body>

  
  <div class="nav-bar">
    <button class="nav-btn active" data-part="0">🖥️ Monitor</button>
    <button class="nav-btn" data-part="1">🔲 Case</button>
    <button class="nav-btn" data-part="2">⌨️ Keyboard</button>
    <button class="nav-btn" data-part="3">🖱️ Mouse</button>
  </div>

  
  <div class="stage">
    <div class="desk-surface"></div>

    
    <div class="hw-part part-monitor active" data-part="0">
      <div class="screen-inner">🎮</div>
      <div class="monitor-stand"></div>
      <div class="monitor-base"></div>
    </div>

    
    <div class="hw-part part-tower" data-part="1">
      <div class="tower-power"></div>
      <div class="tower-slot"></div>
      <div class="tower-slot"></div>
      <div class="tower-slot"></div>
    </div>

    
    <div class="hw-part part-keyboard" data-part="2">
      <div class="key-row">
        <div class="key-cap"></div><div class="key-cap"></div><div class="key-cap"></div><div class="key-cap"></div><div class="key-cap"></div>
      </div>
      <div class="key-row">
        <div class="key-cap"></div><div class="key-cap key-space"></div><div class="key-cap"></div>
      </div>
    </div>

    
    <div class="hw-part part-mouse" data-part="3">
      <div class="mouse-wheel"></div>
    </div>
  </div>

  
  <div class="info-badge" id="infoLabel">🖥️ Monitor</div>

  <script src="{{VENDOR_CDN}}/classace-diagram.js"></script>
  <script>
    const labels = [
      '🖥️ Monitor',
      '🔲 Computer Case',
      '⌨️ Keyboard',
      '🖱️ Mouse'
    ];

    const navBtns = document.querySelectorAll('.nav-btn');
    const parts = document.querySelectorAll('.hw-part');
    const infoLabel = document.getElementById('infoLabel');

    let currentIndex = 0;

    function selectPart(index) {
      currentIndex = index;
      navBtns.forEach((btn, i) => {
        btn.classList.toggle('active', i === index);
      });
      parts.forEach((part, i) => {
        part.classList.toggle('active', i === index);
      });
      infoLabel.textContent = labels[index];
    }

    navBtns.forEach((btn, i) => {
      btn.addEventListener('click', () => selectPart(i));
    });

    parts.forEach((part, i) => {
      part.addEventListener('click', () => selectPart(i));
    });
  </script>
</body>
</html>

Which part lets your eyes see your favorite games, videos, and drawings?

The **screen**, also called a **monitor**, shows words, pictures, and videos so you can see what the computer is doing.

<!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>Monitor Output</title>
<style>
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: #f8f9fa;
    color: #1e2945;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 16px;
  }

  .nav-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    background: #eef2f6;
    padding: 4px;
    border-radius: 24px;
  }

  .nav-btn {
    border: none;
    background: transparent;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 600;
    color: #64748b;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.25s ease;
    display: flex;
    align-items: center;
    gap: 6px;
  }

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

  /* Monitor Setup */
  .monitor-rig {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 380px;
  }

  .bezel {
    width: 100%;
    aspect-ratio: 16 / 10;
    background: #1e293b;
    border-radius: 12px;
    padding: 12px;
    box-shadow: 0 12px 28px rgba(30, 41, 69, 0.18);
    position: relative;
    display: flex;
    flex-direction: column;
  }

  .screen {
    flex: 1;
    background: #ffffff;
    border-radius: 6px;
    position: relative;
    overflow: hidden;
  }

  .chin {
    height: 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 4px;
  }

  .power-led {
    width: 4px;
    height: 4px;
    background: #22b7ff;
    border-radius: 50%;
    box-shadow: 0 0 6px #22b7ff;
    margin-left: auto;
  }

  .stand-neck {
    width: 32px;
    height: 28px;
    background: linear-gradient(to right, #94a3b8, #cbd5e1, #94a3b8);
  }

  .stand-base {
    width: 130px;
    height: 8px;
    background: #64748b;
    border-radius: 4px 4px 2px 2px;
  }

  /* Content Views */
  .view-panel {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    padding: 16px;
  }

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

  /* 1. Words View */
  .doc-sheet {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 14px 18px;
    width: 86%;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }

  .text-row {
    font-size: 15px;
    font-weight: 700;
    color: #0f172a;
    display: flex;
    align-items: center;
  }

  .cursor-blink {
    display: inline-block;
    width: 2px;
    height: 16px;
    background: #22b7ff;
    margin-left: 2px;
    animation: blink 0.9s infinite;
  }

  .fake-line {
    height: 6px;
    background: #e2e8f0;
    border-radius: 3px;
  }

  @keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
  }

  /* 2. Pictures View */
  .art-card {
    width: 90%;
    height: 88%;
    border-radius: 8px;
    background: linear-gradient(180deg, #bae6fd 0%, #e0f2fe 55%, #86efac 55%, #4ade80 100%);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .sun {
    position: absolute;
    top: 14px;
    right: 20px;
    width: 28px;
    height: 28px;
    background: #facc15;
    border-radius: 50%;
    box-shadow: 0 0 12px #fde047;
  }

  .mountain-left {
    position: absolute;
    bottom: 25%;
    left: 20%;
    width: 0;
    height: 0;
    border-left: 45px solid transparent;
    border-right: 45px solid transparent;
    border-bottom: 50px solid #0284c7;
  }

  .mountain-right {
    position: absolute;
    bottom: 25%;
    right: 25%;
    width: 0;
    height: 0;
    border-left: 35px solid transparent;
    border-right: 35px solid transparent;
    border-bottom: 40px solid #38bdf8;
  }

  /* 3. Videos View */
  .video-stage {
    width: 92%;
    height: 90%;
    background: #0f172a;
    border-radius: 8px;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }

  .play-circle {
    width: 44px;
    height: 44px;
    background: rgba(34, 183, 255, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: 18px;
    padding-left: 3px;
    box-shadow: 0 0 14px rgba(34, 183, 255, 0.5);
  }

  .video-bar {
    position: absolute;
    bottom: 10px;
    left: 12px;
    right: 12px;
    height: 4px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
    overflow: hidden;
  }

  .video-prog {
    width: 65%;
    height: 100%;
    background: #22b7ff;
    border-radius: 2px;
    animation: progress 3s infinite linear;
  }

  @keyframes progress {
    0% { width: 10%; }
    100% { width: 95%; }
  }
</style>
</head>
<body>

  <div class="nav-bar">
    <button class="nav-btn active" data-tab="0">📝 Words</button>
    <button class="nav-btn" data-tab="1">🖼️ Pictures</button>
    <button class="nav-btn" data-tab="2">🎬 Videos</button>
  </div>

  <div class="monitor-rig">
    <div class="bezel">
      <div class="screen">
        
        
        <div class="view-panel active" id="view-0">
          <div class="doc-sheet">
            <div class="text-row">Hello World<span class="cursor-blink"></span></div>
            <div class="fake-line" style="width: 80%;"></div>
            <div class="fake-line" style="width: 55%;"></div>
          </div>
        </div>

        
        <div class="view-panel" id="view-1">
          <div class="art-card">
            <div class="sun"></div>
            <div class="mountain-left"></div>
            <div class="mountain-right"></div>
          </div>
        </div>

        
        <div class="view-panel" id="view-2">
          <div class="video-stage">
            <div class="play-circle">▶</div>
            <div class="video-bar">
              <div class="video-prog"></div>
            </div>
          </div>
        </div>

      </div>
      <div class="chin">
        <div class="power-led"></div>
      </div>
    </div>
    <div class="stand-neck"></div>
    <div class="stand-base"></div>
  </div>

  <script src="{{VENDOR_CDN}}/classace-diagram.js"></script>
  <script>
    const btns = document.querySelectorAll('.nav-btn');
    const views = document.querySelectorAll('.view-panel');
    let currentIndex = 0;
    let autoTimer = null;

    function setTab(index) {
      currentIndex = index;
      btns.forEach((btn, i) => btn.classList.toggle('active', i === index));
      views.forEach((view, i) => view.classList.toggle('active', i === index));
    }

    btns.forEach((btn, i) => {
      btn.addEventListener('click', () => {
        clearInterval(autoTimer);
        setTab(i);
        startTimer();
      });
    });

    function startTimer() {
      autoTimer = setInterval(() => {
        setTab((currentIndex + 1) % btns.length);
      }, 3200);
    }

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

The screen shows you pictures, but how do you talk back to the computer?

The **keyboard** is covered in buttons called keys with letters, numbers, and symbols that you press to type words.

The **mouse** is a tool you hold in your hand to move a pointer on the screen and click on things.

<!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>Computer Parts</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;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    min-height: 100%;
    padding: 12px;
    user-select: none;
    -webkit-user-select: none;
  }

  .stage {
    position: relative;
    width: 100%;
    max-width: 520px;
    height: 300px;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    overflow: hidden;
  }

  svg.cables {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
  }

  .cable-path {
    fill: none;
    stroke: #e2e8f0;
    stroke-width: 3;
    stroke-linecap: round;
    transition: stroke 0.3s ease, stroke-width 0.3s ease;
  }

  .cable-pulse {
    fill: none;
    stroke: #22b7ff;
    stroke-width: 3;
    stroke-linecap: round;
    stroke-dasharray: 6 12;
    opacity: 0;
    transition: opacity 0.3s ease;
  }

  .active-cable .cable-path { stroke: #bae6fd; }
  .active-cable .cable-pulse {
    opacity: 1;
    animation: dash 1s linear infinite;
  }

  @keyframes dash {
    from { stroke-dashoffset: 36; }
    to { stroke-dashoffset: 0; }
  }

  .part {
    position: absolute;
    z-index: 2;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: #ffffff;
    border: 2px solid transparent;
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
  }

  .part.active {
    border-color: #22b7ff;
    box-shadow: 0 0 0 3px rgba(34, 183, 255, 0.25), 0 4px 12px rgba(0,0,0,0.1);
  }

  .part-label {
    font-size: 13px;
    font-weight: 600;
    color: #1e2945;
    margin-top: 4px;
    text-align: center;
  }

  .part-icon {
    font-size: 26px;
    line-height: 1;
  }

  /* Specific Part Positions */
  #part-monitor {
    top: 18%;
    left: 20%;
    width: 34%;
    height: 38%;
  }

  #part-tower {
    top: 16%;
    right: 8%;
    width: 26%;
    height: 60%;
    background: #f1f5f9;
  }

  #part-keyboard {
    bottom: 12%;
    left: 10%;
    width: 44%;
    height: 22%;
  }

  #part-mouse {
    bottom: 12%;
    left: 60%;
    width: 18%;
    height: 22%;
  }

  /* Screen Content Simulation */
  .screen-display {
    width: 82%;
    height: 60%;
    background: #e2e8f0;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: background 0.3s ease, color 0.3s ease;
  }
  .active #part-screen-content {
    background: #e0f2fe;
  }

  .cursor-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    background: #22b7ff;
    border-radius: 50%;
    opacity: 0;
  }
  .show-cursor .cursor-dot {
    opacity: 1;
    animation: blink 0.8s ease infinite;
  }

  @keyframes blink {
    0%, 100% { opacity: 0; }
    50% { opacity: 1; }
  }

  /* Stepper / Controls Bar */
  .controls {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    width: 100%;
    max-width: 520px;
    margin-top: 10px;
  }

  .btn {
    padding: 7px 14px;
    font-size: 13px;
    font-weight: 600;
    border: 1px solid #e2e8f0;
    background: #ffffff;
    color: #1e2945;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: background 0.2s, border-color 0.2s;
  }

  .btn.active {
    background: #22b7ff;
    color: #ffffff;
    border-color: #22b7ff;
  }
</style>
</head>
<body>

<div class="stage" id="stage">
  <svg class="cables" viewBox="0 0 520 300">
    
    <g id="cable-keyboard">
      <path class="cable-path" d="M 280 250 C 370 250, 390 220, 420 200" />
      <path class="cable-pulse" d="M 280 250 C 370 250, 390 220, 420 200" />
    </g>

    
    <g id="cable-mouse">
      <path class="cable-path" d="M 360 250 C 400 250, 410 220, 430 200" />
      <path class="cable-pulse" d="M 360 250 C 400 250, 410 220, 430 200" />
    </g>

    
    <g id="cable-monitor">
      <path class="cable-path" d="M 420 120 C 340 120, 320 110, 280 110" />
      <path class="cable-pulse" d="M 420 120 C 340 120, 320 110, 280 110" />
    </g>
  </svg>

  
  <div class="part" id="part-monitor" onclick="selectPart(0)">
    <div class="screen-display" id="part-screen-content">
      <span id="screen-text">🖥️</span>
      <span class="cursor-dot" id="screen-cursor"></span>
    </div>
    <span class="part-label">Monitor</span>
  </div>

  
  <div class="part" id="part-tower" onclick="selectPart(3)">
    <div class="part-icon" id="tower-icon">⚙️</div>
    <span class="part-label">Tower</span>
  </div>

  
  <div class="part" id="part-keyboard" onclick="selectPart(1)">
    <div class="part-icon">⌨️</div>
    <span class="part-label">Keyboard</span>
  </div>

  
  <div class="part" id="part-mouse" onclick="selectPart(2)">
    <div class="part-icon">🖱️</div>
    <span class="part-label">Mouse</span>
  </div>
</div>

<div class="controls">
  <button class="btn active" id="btn-0" onclick="selectPart(0)">🖥️ Monitor</button>
  <button class="btn" id="btn-1" onclick="selectPart(1)">⌨️ Keyboard</button>
  <button class="btn" id="btn-2" onclick="selectPart(2)">🖱️ Mouse</button>
  <button class="btn" id="btn-3" onclick="selectPart(3)">⚙️ Tower</button>
</div>

<script>
  let currentIndex = 0;
  let autoTimer = null;

  const parts = [
    { id: 'part-monitor', cable: 'cable-monitor', icon: '🖥️' },
    { id: 'part-keyboard', cable: 'cable-keyboard', icon: '⌨️' },
    { id: 'part-mouse', cable: 'cable-mouse', icon: '🖱️' },
    { id: 'part-tower', cable: 'all', icon: '⚙️' }
  ];

  function selectPart(index) {
    currentIndex = index;

    // Reset classes
    document.querySelectorAll('.part').forEach(el => el.classList.remove('active'));
    document.querySelectorAll('.btn').forEach(el => el.classList.remove('active'));
    document.querySelectorAll('g[id^="cable-"]').forEach(el => el.classList.remove('active-cable'));
    document.getElementById('part-screen-content').classList.remove('show-cursor');

    // Activate selected part
    const part = parts[index];
    document.getElementById(part.id).classList.add('active');
    document.getElementById('btn-' + index).classList.add('active');

    // Cable & visual feedback
    if (part.cable === 'all') {
      document.querySelectorAll('g[id^="cable-"]').forEach(el => el.classList.add('active-cable'));
      document.getElementById('screen-text').textContent = '⚡';
    } else {
      document.getElementById(part.cable).classList.add('active-cable');
      if (index === 0) {
        document.getElementById('screen-text').textContent = '🖥️';
      } else if (index === 1) {
        document.getElementById('screen-text').textContent = 'ABC';
        document.getElementById('part-screen-content').classList.add('show-cursor');
      } else if (index === 2) {
        document.getElementById('screen-text').textContent = '↖';
      }
    }

    restartAutoCycle();
  }

  function nextPart() {
    currentIndex = (currentIndex + 1) % parts.length;
    selectPart(currentIndex);
  }

  function restartAutoCycle() {
    clearInterval(autoTimer);
    autoTimer = setInterval(nextPart, 3200);
  }

  // Initial auto cycle
  restartAutoCycle();
</script>
</body>
</html>

All of these parts plug into one main box, but what does that box actually do?

The **computer box**, also called the **system unit** or tower, holds the main parts that do all the thinking and math.

Inside this box is the computer's **brain**, which follows your instructions whenever you type or click.

<!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>How a Computer Works</title>
<style>
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: #f8f9fa;
    color: #1e2945;
    padding: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    min-height: 100%;
    user-select: none;
  }

  .interactive-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    margin-bottom: 8px;
  }

  .key-btn {
    background: #ffffff;
    border: 2px solid #d1d5db;
    border-radius: 8px;
    padding: 6px 14px;
    font-size: 16px;
    font-weight: 700;
    color: #1e2945;
    cursor: pointer;
    box-shadow: 0 2px 0 #cbd5e1;
    transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
  }
  .key-btn:active {
    box-shadow: 0 0 0 #cbd5e1;
  }
  .key-btn.active {
    background: #22b7ff;
    color: #ffffff;
    border-color: #0284c7;
  }

  .pipeline {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    width: 100%;
    max-width: 580px;
    align-items: stretch;
    position: relative;
    margin: auto 0;
  }

  .stage-card {
    background: #ffffff;
    border-radius: 12px;
    padding: 12px 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    border: 2px solid rgba(0,0,0,0);
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: box-shadow 0.3s, border-color 0.3s, background 0.3s;
    min-height: 140px;
    position: relative;
  }

  .stage-card.active {
    border-color: #22b7ff;
    box-shadow: 0 4px 14px rgba(34, 183, 255, 0.3);
    background: #f0f9ff;
  }

  .stage-icon {
    font-size: 28px;
    line-height: 1;
    margin-bottom: 6px;
  }

  .stage-title {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #64748b;
    margin-bottom: 4px;
  }
  .stage-card.active .stage-title {
    color: #0284c7;
  }

  .stage-label {
    font-size: 15px;
    font-weight: 700;
    color: #1e2945;
  }

  .center-split {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
  }

  .sub-card {
    background: #f8fafc;
    border-radius: 8px;
    padding: 6px 4px;
    border: 1px solid #e2e8f0;
    transition: background 0.3s, border-color 0.3s;
  }
  .sub-card.active {
    background: #e0f2fe;
    border-color: #38bdf8;
  }

  .monitor-screen {
    width: 60px;
    height: 44px;
    background: #1e293b;
    border-radius: 6px;
    border: 3px solid #64748b;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #38ef7d;
    font-family: monospace;
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 4px;
    position: relative;
    overflow: hidden;
  }

  .cursor {
    animation: blink 1s infinite;
  }
  @keyframes blink {
    0%, 49% { opacity: 1; }
    50%, 100% { opacity: 0; }
  }

  .arrow-connector {
    position: absolute;
    top: 50%;
    width: 20px;
    height: 20px;
    margin-top: -10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #94a3b8;
    font-weight: 900;
    font-size: 16px;
    z-index: 2;
  }
  .arrow-1 { left: calc(33.33% - 10px); }
  .arrow-2 { left: calc(66.66% - 10px); }

  .packet {
    position: absolute;
    width: 28px;
    height: 28px;
    background: #22b7ff;
    color: #ffffff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 14px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
    z-index: 10;
    pointer-events: none;
    opacity: 0;
    transition: transform 0.4s ease, opacity 0.2s;
  }

  .controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    margin-top: 8px;
  }

  .ctrl-btn {
    background: #ffffff;
    border: 1px solid #d1d5db;
    border-radius: 20px;
    padding: 6px 16px;
    font-size: 13px;
    font-weight: 600;
    color: #4b5563;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: background 0.2s;
  }
  .ctrl-btn:active {
    background: #f1f5f9;
  }

  .step-dots {
    display: flex;
    gap: 6px;
    margin-left: 8px;
  }
  .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #cbd5e1;
    cursor: pointer;
    transition: background 0.2s, transform 0.2s;
  }
  .dot.active {
    background: #22b7ff;
    transform: scale(1.2);
  }

  @media (max-width: 400px) {
    .stage-label { font-size: 13px; }
    .stage-icon { font-size: 24px; }
    .monitor-screen { width: 50px; height: 38px; font-size: 20px; }
  }
</style>
</head>
<body>

  
  <div class="interactive-bar">
    <button class="key-btn active" onclick="sendInput('A', this)">A</button>
    <button class="key-btn" onclick="sendInput('7', this)">7</button>
    <button class="key-btn" onclick="sendInput('★', this)">★</button>
  </div>

  
  <div class="pipeline" id="pipelineBox">
    <div class="arrow-connector arrow-1">➔</div>
    <div class="arrow-connector arrow-2">➔</div>

    
    <div class="stage-card active" id="cardInput">
      <div class="stage-icon">⌨️</div>
      <div class="stage-title">Input</div>
      <div class="stage-label">Keyboard</div>
    </div>

    
    <div class="stage-card" id="cardProcess">
      <div class="center-split">
        <div class="sub-card active" id="subCpu">
          <div class="stage-icon" style="font-size:18px; margin-bottom:2px;">🧠</div>
          <div class="stage-title" style="margin-bottom:0;">CPU</div>
        </div>
        <div class="sub-card" id="subRam">
          <div class="stage-icon" style="font-size:18px; margin-bottom:2px;">💾</div>
          <div class="stage-title" style="margin-bottom:0;">Memory</div>
        </div>
      </div>
    </div>

    
    <div class="stage-card" id="cardOutput">
      <div class="monitor-screen">
        <span id="screenChar">A</span><span class="cursor">_</span>
      </div>
      <div class="stage-title">Output</div>
      <div class="stage-label">Screen</div>
    </div>

    
    <div class="packet" id="dataPacket">A</div>
  </div>

  
  <div class="controls">
    <button class="ctrl-btn" id="playBtn" onclick="toggleAuto()">▶ Auto</button>
    <div class="step-dots">
      <div class="dot active" onclick="setStep(0)"></div>
      <div class="dot" onclick="setStep(1)"></div>
      <div class="dot" onclick="setStep(2)"></div>
      <div class="dot" onclick="setStep(3)"></div>
    </div>
  </div>

<script>
  let currentChar = 'A';
  let currentStep = 0;
  let autoTimer = null;
  let isPlaying = false;

  const cardInput = document.getElementById('cardInput');
  const cardProcess = document.getElementById('cardProcess');
  const subCpu = document.getElementById('subCpu');
  const subRam = document.getElementById('subRam');
  const cardOutput = document.getElementById('cardOutput');
  const screenChar = document.getElementById('screenChar');
  const dataPacket = document.getElementById('dataPacket');
  const playBtn = document.getElementById('playBtn');
  const dots = document.querySelectorAll('.dot');

  function updateVisuals(step) {
    currentStep = step;
    dots.forEach((d, i) => d.classList.toggle('active', i === step));

    // Reset card highlights
    cardInput.classList.remove('active');
    cardProcess.classList.remove('active');
    subCpu.classList.remove('active');
    subRam.classList.remove('active');
    cardOutput.classList.remove('active');

    const pBox = document.getElementById('pipelineBox').getBoundingClientRect();
    const cIn = cardInput.getBoundingClientRect();
    const cProc = cardProcess.getBoundingClientRect();
    const cOut = cardOutput.getBoundingClientRect();

    dataPacket.style.opacity = '1';
    dataPacket.textContent = currentChar;

    if (step === 0) {
      // Input stage
      cardInput.classList.add('active');
      const x = cIn.left - pBox.left + cIn.width / 2 - 14;
      const y = cIn.top - pBox.top + cIn.height / 2 - 14;
      dataPacket.style.transform = `translate(${x}px, ${y}px)`;
    } else if (step === 1) {
      // CPU stage
      cardProcess.classList.add('active');
      subCpu.classList.add('active');
      const x = cProc.left - pBox.left + cProc.width / 2 - 14;
      const y = cProc.top - pBox.top + cProc.height * 0.3 - 14;
      dataPacket.style.transform = `translate(${x}px, ${y}px)`;
    } else if (step === 2) {
      // Memory stage
      cardProcess.classList.add('active');
      subRam.classList.add('active');
      const x = cProc.left - pBox.left + cProc.width / 2 - 14;
      const y = cProc.top - pBox.top + cProc.height * 0.7 - 14;
      dataPacket.style.transform = `translate(${x}px, ${y}px)`;
    } else if (step === 3) {
      // Output stage
      cardOutput.classList.add('active');
      const x = cOut.left - pBox.left + cOut.width / 2 - 14;
      const y = cOut.top - pBox.top + cOut.height / 2 - 14;
      dataPacket.style.transform = `translate(${x}px, ${y}px)`;
      screenChar.textContent = currentChar;
    }
  }

  function setStep(step) {
    updateVisuals(step);
  }

  function sendInput(char, btn) {
    currentChar = char;
    document.querySelectorAll('.key-btn').forEach(b => b.classList.remove('active'));
    if (btn) btn.classList.add('active');
    setStep(0);
    setTimeout(() => setStep(1), 400);
    setTimeout(() => setStep(2), 800);
    setTimeout(() => setStep(3), 1200);
  }

  function nextStep() {
    const next = (currentStep + 1) % 4;
    if (next === 0) {
      const chars = ['A', '7', '★'];
      const nextIdx = (chars.indexOf(currentChar) + 1) % chars.length;
      currentChar = chars[nextIdx];
      document.querySelectorAll('.key-btn').forEach(b => {
        b.classList.toggle('active', b.textContent === currentChar);
      });
    }
    updateVisuals(next);
  }

  function toggleAuto() {
    isPlaying = !isPlaying;
    playBtn.innerHTML = isPlaying ? '⏸ Pause' : '▶ Auto';
    if (isPlaying) {
      nextStep();
      autoTimer = setInterval(nextStep, 1500);
    } else {
      clearInterval(autoTimer);
    }
  }

  window.addEventListener('resize', () => updateVisuals(currentStep));
  // Initialize
  setTimeout(() => updateVisuals(0), 50);
</script>
</body>
</html>

Imagine you want to type your name in a drawing game. You press the keys on the **keyboard**, move the brush with the **mouse**, see the colors on the **screen**, and the **computer box** runs the whole game!

Next time you sit at a computer, see if you can point to all four main parts before you start playing!

technology

What Is a Computer? Parts and Components. Identify the main parts of a computer system such as the screen, keyboard, mouse, and computer box.

Computer Basics: Basic Parts of a Computer

KS1 Computing: What is a Computer and What are its Parts?

CS Fundamentals: What is a Computer and How Computers Work (Hardware & Software)

When teaching 2nd grade students about computer hardware, begin with tangible, concrete analogies (e.g., comparing the CPU/case to the human brain, the screen to human eyes/face, and the keyboard/mouse to human hands). Use hands-on labeling activities where students place physical or sticker labels on actual computer stations (screen, keyboard, mouse, tower). Emphasize the distinct roles of the monitor (display only) and the tower (computational unit) to correct the widespread misconception that the monitor contains the entire computer.

What Is a Computer? Parts and Components

The Screen

The Keyboard and Mouse