body {
    font-family: Arial, sans-serif;
    background: #f6f8fa;
    padding: 30px;
    max-width: 1000px;
    margin: auto;
}
h1, h2 { text-align: center; }

textarea {
width: 100%;
height: 80px;
font-size: 16px;
padding: 10px;
}

.step {
    background: white;
    padding: 10px;
    margin-top: 10px;
    border-left: 4px solid #007acc;
}

.highlight {
    color: #d6336c;
    font-weight: bold;
}

.stats {
    background: #eef3f7;
    padding: 15px;
    margin-top: 15px;
    border-radius: 6px;
}

.good { color: green; font-weight: bold; }

.bad { color: red; font-weight: bold; }

.controls {
    text-align: center;
    margin: 20px 0;
}

input {
    width: 60px;
    padding: 5px;
    margin: 0 5px;
}

.container {
    display: flex;
    gap: 40px;
    justify-content: center;
    flex-wrap: wrap;
}

.grid {
    display: grid;
    gap: 4px;
}

.cell {
    width: 26px;
    height: 26px;
    border: 1px solid #ccc;
}

.black { background: #000; }

.white { background: #fff; }

.active { outline: 3px solid #ff9800; }

.run {
    display: inline-block;
    margin-right: 6px;
    padding: 4px 6px;
    background: white;
    border-left: 3px solid #007acc;
}