body {
    background: radial-gradient(circle, #000000 0%, #1f1f1f 100%);
    color: #fff;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid #ffcc00;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 0 15px #ffcc00;
    width: 320px;
}

h1 {
    color: #ffcc00;
    margin-bottom: 20px;
}

input[type="number"] {
    padding: 10px;
    border: none;
    border-radius: 5px;
    margin-bottom: 10px;
    width: 100%;
    font-size: 1em;
}

button {
    background-color: #ffcc00;
    color: #000;
    padding: 10px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    width: 100%;
    font-size: 1em;
}

button:hover {
    background-color: #e6b800;
}

.saldo, .mensagem, .mensagem-final {
    margin-top: 10px;
    font-size: 1.2em;
}

.mensagem-final {
    font-weight: bold;
    color: #ff4444;
}

.reiniciar {
    display: inline-block;
    margin-top: 15px;
    color: #ffcc00;
    text-decoration: underline;
    cursor: pointer;
}

.resultado {
    margin-top: 20px;
    margin-bottom: 20px;
}

.simbolo {
    font-size: 3em;
    margin: 0 8px;
    display: inline-block;
    text-shadow: 0 0 5px #ffcc00;
    border: 2px solid #ffcc00;  /* Borda dourada */
    padding: 10px;
    border-radius: 10px;
    width: 60px;
    height: 60px;
    line-height: 60px;
    background-color: rgba(255, 255, 255, 0.05);
    box-shadow: 0 0 10px #ffcc00;
}