body {
    font-family: system-ui, -apple-system, sans-serif;
    background-color: #f3f4f6;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    text-align: center;
    max-width: 500px;
}

h1 { 
    color: #111827; 
    margin-top: 0;
}

p { 
    color: #4b5563; 
    line-height: 1.5;
}

button {
    background-color: #059669;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    margin-top: 15px;
    transition: background-color 0.2s;
}

button:hover { 
    background-color: #047857; 
}

#result {
    margin-top: 20px;
    font-weight: bold;
    color: #059669;
}