* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #000;
    background: #fff;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

header {
    border-bottom: 2px solid #000;
    margin-bottom: 40px;
    padding-bottom: 20px;
}

nav h1 {
    font-size: 1.8em;
    margin-bottom: 10px;
}

nav h1 a {
    color: #000;
    text-decoration: none;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

nav a {
    color: #000;
    text-decoration: none;
    border-bottom: 1px solid transparent;
}

nav a:hover {
    border-bottom: 1px solid #000;
}

main {
    min-height: 60vh;
}

article h1 {
    font-size: 2em;
    margin-bottom: 20px;
}

article h2 {
    font-size: 1.5em;
    margin-top: 30px;
    margin-bottom: 15px;
}

article p {
    margin-bottom: 15px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #000;
}

th {
    font-weight: bold;
    border-bottom: 2px solid #000;
}

tr:hover {
    background: #f5f5f5;
}

footer {
    margin-top: 60px;
    padding-top: 20px;
    border-top: 2px solid #000;
    text-align: center;
    color: #666;
}