/* General Styles */
body {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4; /* Light grey background for contrast */
    color: #333;
}

/* Header Styles */
header {
    background-color: #002D62; /* Deep Navy Blue - Primary Color */
    color: #ffffff; /* White text */
    padding: 1rem 0;
    text-align: center;
}

header h1 {
    margin: 0;
    padding-bottom: 0.5rem;
}

/* Navigation Styles */
nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    background-color: #004080; /* Slightly lighter navy for nav */
    text-align: center;
}

nav ul li {
    display: inline-block;
}

nav ul li a {
    display: block;
    padding: 0.8rem 1.2rem;
    color: #ffffff; /* White text */
    text-decoration: none;
    transition: background-color 0.3s ease;
}

nav ul li a:hover {
    background-color: #76BEE0; /* Light Blue Accent on hover */
    color: #002D62; /* Navy text on hover */
}

/* Main Content Styles */
main {
    max-width: 1100px;
    margin: 2rem auto;
    padding: 0 1rem;
}

section {
    background-color: #ffffff; /* White background for content sections */
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

section h2 {
    color: #002D62; /* Navy Blue for section titles */
    border-bottom: 2px solid #76BEE0; /* Light Blue Accent underline */
    padding-bottom: 0.5rem;
    margin-top: 0;
}

.module h3 {
    color: #004080; /* Slightly lighter navy for subheadings */
    margin-top: 1.5rem;
}

/* Materials List Styles */
.materials ul {
    list-style: none;
    padding-left: 0;
}

.materials ul li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.materials ul li::before {
    content: '\2714'; /* Checkmark symbol */
    color: #76BEE0; /* Light Blue Accent */
    position: absolute;
    left: 0;
    top: 1px;
}

.materials ul li a {
    color: #0056b3; /* Standard link blue */
    text-decoration: none;
}

.materials ul li a:hover {
    text-decoration: underline;
}

/* Footer Styles */
footer {
    background-color: #002D62; /* Deep Navy Blue */
    color: #ffffff; /* White text */
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    nav ul li {
        display: block;
        text-align: center;
    }
    nav ul li a {
        padding: 0.8rem;
    }
    header h1 {
        font-size: 1.5rem;
    }
}