body {
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.2);
    text-align: center;
    width: 320px;
}

h2 {
    margin-bottom: 20px;
}

canvas {
    border: 2px solid #ddd;
    border-radius: 6px;
    margin-bottom: 15px;
}

input {
    width: 100%;
    padding: 10px;
    margin-bottom: 12px;
    border-radius: 6px;
    border: 1px solid #ccc;
    font-size: 14px;
    box-sizing: border-box;
}

button {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 6px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    font-size: 15px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}

button:active {
    transform: translateY(0);
    box-shadow: none;
}

#result {
    margin-top: 12px;
    font-weight: bold;
}