:root {
    --primary-color: #004492;
    --text-color: #333;
    --bg-color: #fff;
    --nav-bg: #f8f9fa;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    margin: 0;
    padding: 0;
    background: var(--bg-color);
}

nav {
    background: var(--nav-bg);
    padding: 1rem;
    text-align: center;
}

nav a {
    color: var(--primary-color);
    text-decoration: none;
    margin: 0 1rem;
    font-weight: 500;
}

nav a:hover {
    text-decoration: underline;
}

main {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}

h1, h2, h3 {
    color: var(--primary-color);
}

footer {
    text-align: center;
    padding: 2rem;
    background: var(--nav-bg);
    margin-top: 4rem;
}

.emoji {
    font-size: 1.5em;
    margin-right: 0.5rem;
}

@media (max-width: 600px) {
    nav a {
        display: block;
        margin: 0.5rem 0;
    }
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 2rem auto;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.screenshot {
    max-width: 800px;
    width: 100%;
}