body {
    font-family: Arial, sans-serif;
    background-color: #1e1e2f;
    color: #fff;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 600px;
    margin: 50px auto;
    padding: 20px;
    background-color: #252545;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
}

h1 {
    text-align: center;
    color: #42a5f5;
}

form {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 5px;
}

input[type="number"] {
    width: 100%;
    padding: 8px;
    border-radius: 5px;
    border: 1px solid #ccc;
    margin-bottom: 10px;
    box-sizing: border-box;
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-right: 10px;
}

button i {
    margin-right: 5px;
}

#resultado {
    margin-top: 20px;
}

.danger {
    color: #ff7043;
}

.success {
    color: #4caf50;
}

.dark-mode {
    background-color: #121212;
    color: #fff;
}

.dark-mode .container {
    background-color: #1f1f1f;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.dark-mode label {
    color: #aaa;
}

.dark-mode input[type="number"] {
    background-color: #333;
    color: #fff;
    border: 1px solid #555;
}

.dark-mode button {
    background-color: #42a5f5;
    color: #fff;
}

.dark-mode button:hover {
    background-color: #64b5f6;
}