body {
    font-family: system-ui, sans-serif;
    margin: 0;
    padding: 1rem;
    line-height: 1.5;
    background: white;
    color: black;
}
@media (prefers-color-scheme: dark) {
    body {
        background: #121212;
        color: white;
    }
}
.dark-mode {
    background: #121212 !important;
    color: white !important;
}
h1 {
    font-size: 2.5rem;
    text-align: center;
}
h2 {
    font-size: 1.5rem;
    text-align: center;
}
nav ul, main ul {
    list-style: none;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}
th, td {
    border: 1px solid #000;
    padding: 0.5rem;
    text-align: left;
}
.dark-mode th, .dark-mode td {
    border-color: #fff;
}
button {
    padding: 0.5rem 1rem;
    cursor: pointer;
}
a {
    color: blue;
    text-decoration: none;
}
.dark-mode a {
    color: lightblue;
}
footer {
    text-align: center;
    padding: 1rem 0;
}
@media (max-width: 600px) {
    table {
        font-size: 0.9rem;
    }
}