/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
    padding: 40px 20px;
    max-width: 800px;
    margin: 0 auto;
}

/* Navigation */
.nav {
    margin-bottom: 60px;
    display: flex;
    gap: 30px;
}

.nav a {
    font-size: 16px;
    color: #666;
    text-decoration: none;
    font-weight: 400;
}

.nav a:hover {
    color: #000;
}

.nav a.active {
    color: #000;
    font-weight: 500;
}

.nav .current {
    color: #000;
    font-weight: 500;
    text-decoration: line-through;
}

/* Copyright Footer */
.copyright {
    margin-top: 60px;
    padding-top: 20px;
    border-top: 1px solid #eee;
    font-size: 12px;
    color: #999;
    text-align: center;
}

/* Common Typography */
h1, h2, h3, h4, h5, h6 {
    color: #000;
}

/* Common Responsive */
@media (max-width: 600px) {
    body {
        padding: 20px 15px;
    }

    .nav {
        margin-bottom: 40px;
        gap: 20px;
    }

    .copyright {
        margin-top: 40px;
    }
}