body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background: #0d1117;
    color: #f5f5f5;
}


.visually-hidden {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

header {
    text-align: center;
    padding: 20px 10px;
    border-bottom: 1px solid #282c34;
    background: #010409;
}

header h1 {
    margin: 10px 0 0;
    font-size: 24px;
}

.logo-block img {
    max-height: 80px;
}


nav {
    text-align: center;
    margin: 20px 0;
}

nav a {
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    color: #58a6ff;
}

nav a:hover {
    text-decoration: underline;
}

main {
    max-width: 1100px;
    margin: 25px auto 40px;
    padding: 0 15px;
}

section {
    margin-bottom: 28px;
}

h2 {
    font-size: 20px;
    margin-bottom: 12px;
    border-bottom: 1px solid #30363d;
    padding-bottom: 4px;
}


.box {
    background: #161b22;
    border-radius: 8px;
    border: 1px solid #30363d;
    padding: 12px;
}

figure {
    margin: 12px 0;
    text-align: center;
}

figure img {
    max-width: 100%;
    border-radius: 6px;
    border: 1px solid #30363d;
}

footer {
    text-align: center;
    padding: 10px 0 15px;
    font-size: 12px;
    color: #8b949e;
    border-top: 1px solid #282c34;
    background: #010409;
}