* {
    margin: 0;
    padding: 0;
    box-sizing: border-box; /* Makes layout calculations easier */
}

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    background-color: #121212; /* Dark background color */
    color: #E0E0E0; /* Light text color for contrast */
    padding: 20px;
}

/* --- Header Styling --- */
header {
    background-color: #00008B; /* Dark purple */
    color: white;
    padding: 30px 20px;
    text-align: center;
    border-radius: 8px;
    margin-bottom: 30px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

header h1 {
    font-size: 2.2rem;
}

/* --- Layout Container (Responsive Grid using Flexbox) --- */
.container {
    display: flex;
    flex-wrap: wrap; /* Allows cards to wrap on smaller screens */
    gap: 20px; /* Space between the cards */
    max-width: 1200px;
    margin: 0 auto;
}

.card {
    background-color: #00072D; /* Midnight Purple */
    padding: 25px;
    border-radius: 8px;
    flex: 1; /* Distributes space evenly */
    min-width: 300px; /* Ensures cards don't get too narrow on desktop */
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

/* --- Typography Hierarchy --- */
h2 {
    color: #9336FF; /* A vibrant accent purple */
    margin-bottom: 15px;
    border-bottom: 2px solid #9336FF;
    padding-bottom: 10px;
    font-size: 1.5rem;
}

h3 {
    color: #BB86FC; /* Lighter purple for subheadings */
    margin-top: 20px;
    margin-bottom: 10px;
    font-size: 1.2rem;
}

p {
    margin-bottom: 15px;
}

ul, ol {
    margin-left: 20px;
    margin-bottom: 15px;
}

li {
    margin-bottom: 8px;
}

/* --- Footer Styling --- */
footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    color: #888;
    border-top: 1px solid #444;
}

/* --- Basic Responsiveness (Mobile Optimization) --- */
/* Cards stack vertically on screens smaller than 650px */
@media (max-width: 650px) {
    .container {
        flex-direction: column;
    }
    header h1 {
        font-size: 1.5rem;
    }
}