body {
    margin: 0;
    padding: 0;
    font-family: 'Arial', sans-serif;
    height: 100vh;
    background: linear-gradient(135deg, #ff6b6b, #556270);
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background-color: rgba(0, 0, 0, 0.85);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    width: 400px;
    text-align: center;
    color: white;
}

h2 {
    margin-top: 0;
    font-size: 24px;
}

p {
    font-size: 14px;
    color: #bbb;
}

input {
    width: 85%;
    padding: 12px;
    margin: 10px 0;
    border: none;
    border-radius: 8px;
    outline: none;
    font-size: 16px;
    background: #222;
    color: white;
    text-align: center;
}

button {
    width: 90%;
    padding: 12px;
    background: linear-gradient(90deg, #4caf50, #2e7d32);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
}

button:hover {
    background: linear-gradient(90deg, #2e7d32, #4caf50);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(72, 239, 72, 0.6);
}

#resultado {
    margin-top: 20px;
    font-size: 18px;
    padding: 10px;
    border-radius: 8px;
    display: none;
    text-align: center;
    font-weight: bold;
}

.mostrar {
    display: block;
}