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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: #f4f4f4;
    color: #333;
    padding: 20px;
}

.container {
    max-width: 100%;
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h1 {
    color: #003DA5;
    text-align: center;
    margin-bottom: 20px;
    font-size: 24px;
}

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

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

input[type="date"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
}

button {
    display: block;
    width: 100%;
    padding: 12px;
    background-color: #003DA5;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

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

.result {
    margin-top: 20px;
    font-weight: bold;
    color: #003DA5;
    text-align: center;
    font-size: 18px;
}

.about {
    margin-top: 30px;
    padding: 15px;
    background-color: #f9f9f9; /* Light background for the about section */
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1); /* Soft shadow */
}

.about h2 {
    color: #003DA5; /* Match heading color with main theme */
}

.about p {
    margin-bottom: 10px;
}

header, footer {
    text-align: center;
    padding: 20px 0;
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.calculator, .about {
    margin-bottom: 30px;
}

ul {
    margin-left: 20px;
}

/* Media query for larger screens */
@media screen and (min-width: 768px) {
    .container {
        max-width: 600px;
    }

    h1 {
        font-size: 32px;
    }

    button {
        width: auto;
        padding: 12px 24px;
        margin: 0 auto;
    }
}