body {
font-family: Arial, sans-serif;
line-height: 1.6;
margin: 0;
padding: 0;
background-color: #f9f9f9;
color: #222;
}

header, footer {
background-color: #ffffff;
padding: 20px;
text-align: center;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

main {
padding: 20px;
max-width: 800px;
margin: auto;
background-color: #ffffff;
}

h1, h2 {
color: #0a2540;
}

ul, ol {
margin-left: 20px;
}

a {
color: #0044cc;
font-weight: bold;
text-decoration: none;
}

a:hover {
text-decoration: underline;
}

details {
margin-bottom: 15px;
background-color: #eef2f7;
padding: 10px;
border-left: 4px solid #0a2540;
}

summary {
cursor: pointer;
font-weight: bold;
color: #0a2540;
}

summary:focus {
outline: 2px dashed #0044cc;
}

@media (prefers-color-scheme: dark) {
body {
    background-color: #121212;
    color: #e0e0e0;
}

header, footer, main {
    background-color: #1e1e1e;
}

a {
    color: #61dafb;
}

details {
    background-color: #2c2c2c;
    border-left-color: #61dafb;
}

summary {
    color: #61dafb;
}
}