* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: white;
    min-height: 100vh;
    padding: 40px 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

h1 {
    color: #333;
    font-size: 24px;
    margin-bottom: 30px;
    text-align: center;
    line-height: 1.4;
}

#datos {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 20px;
    color: #555;
    font-weight: 500;
    font-size: 14px;
}

input[type="number"] {
    width: 100%;
    padding: 12px 16px;
    margin-top: 8px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

input[type="number"]:focus {
    outline: none;
    border-color: #667eea;
}

button {
    width: 100%;
    padding: 14px;
    background: #333;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease;
}

button:hover {
    background: #555;
}

button:active {
    background: #222;
}

#resultado {
    display: block;
    text-align: center;
    font-size: 32px;
    font-weight: bold;
    margin-top: 20px;
    padding: 20px;
    border-radius: 8px;
    min-height: 60px;
}

#resultado:not(:empty) {
    background: #f5f5f5;
}

#resultado.true {
    color: rgb(0, 167, 0);
}

#resultado.false {
    color: rgb(255, 0, 0);
}