body {
    background: #1e2329; /* Change this for a different color theme */
    color: #f5f5f5;
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    min-height: 100vh;
}
nav {
    background: #29313e;
    padding: 0.5em 0;
}
.nav-container {
    width: 90%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
nav .logo {
    font-size: 1.6em;
    text-decoration: none;
    color: #00bcd4;
    font-weight: bold;
}
nav ul {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;
}
nav ul li {
    margin-left: 1.5em;
}
nav ul li a {
    color: #f5f5f5;
    text-decoration: none;
    padding: 0.4em 1em;
    border-radius: 3px;
    transition: background 0.2s;
}
nav ul li a:hover {
    background: #00bcd4;
    color: #233040;
}
main {
    width: 90%;
    max-width: 900px;
    margin: 2em auto;
    background: #222730;
    border-radius: 8px;
    padding: 2em;
    box-shadow: 0 2px 16px rgba(0,0,0,0.24);
}
article h1, article h2 {
    color: #00bcd4;
    margin-top: 1em;
}
footer {
    background: #29313e;
    color: #f5f5f5;
    text-align: center;
    padding: 1em 0;
    position: relative;
    margin-top: 2em;
}
.footer-container {
    width: 90%;
    margin: 0 auto;
}