body {
    background-color: #121212;
    color: #fff;
    font-family: Arial, sans-serif;
}

.container {
    max-width: 600px;
    margin: 50px auto;
    padding: 20px;
    border-radius: 10px;
    background-color: #1f1f1f;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    position: relative;
}

h1, #instructions-toggle {
    text-align: center;
}

.form-group {
    margin-bottom: 20px;
}

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

input[type="text"],
select {
    width: calc(100% - 20px);
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #333;
    background-color: #444;
    color: #fff;
    margin-bottom: 10px;
}

input[type="radio"] {
    margin-top: 2px;
    margin-right: 5px;
}

.button-container {
    display: flex;
    justify-content: center;
}

#calculateBtn,
#resetBtn {
    width: 40%;
    padding: 10px 20px;
    color: #fff;
    border: none;
    border-radius: 5px;
    margin-right: 10px;
    margin-top: 10px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#calculateBtn {
    background-color: #007bff;
}

#resetBtn {
    background-color: #006400;
}

#calculateBtn:hover {
    background-color: #0056b3;
}

#resetBtn:hover {
    background-color: #004d00;
}

.error-message {
    color: red;
    font-size: smaller;
    margin-left: 5px;
    display: none;
}

input.invalid {
    border-color: red;
}

.blink {
    animation: blink-animation 1s infinite alternate;
}

@keyframes blink-animation {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
    
}

.hidden {
    display: none;
}

.toggle {
    cursor: pointer;
    color: #007bff;
}

.toggle:hover {
    text-decoration: underline;
}

.form-group label {
    display: inline-block;
    vertical-align: middle;
}

.form-group input[type="radio"] {
    display: inline-block;
    vertical-align: top;
}