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

body {
font-family: Arial, sans-serif;
background-color: #f9f9f9;
color: #222;
line-height: 1.7;
padding: 20px;
max-width: 900px;
margin: auto;
}

header {
text-align: center;
margin-bottom: 30px;
}

header h1 {
font-size: 2rem;
margin-bottom: 10px;
color: #1a1a1a;
}

header img {
max-width: 100%;
height: auto;
border-radius: 12px;
box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

main section {
margin-bottom: 40px;
background-color: #fff;
padding: 20px;
border-radius: 12px;
box-shadow: 0 0 8px rgba(0, 0, 0, 0.05);
}

section h2 {
color: #003366;
font-size: 1.4rem;
margin-bottom: 12px;
}

section h3 {
color: #004080;
font-size: 1.2rem;
margin: 18px 0 10px;
}

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

ul li,
ol li {
margin-bottom: 8px;
}

a {
color: #0055aa;
text-decoration: none;
font-weight: 500;
}

a:hover {
text-decoration: underline;
}

details summary {
font-weight: bold;
cursor: pointer;
margin-bottom: 8px;
color: #333;
}

details p {
margin: 10px 0 20px 20px;
color: #444;
}

footer {
text-align: center;
font-size: 0.9rem;
margin-top: 40px;
color: #666;
}

@media screen and (max-width: 600px) {
body {
    padding: 12px;
}

header h1 {
    font-size: 1.5rem;
}

section h2 {
    font-size: 1.2rem;
}
}