body {
    font-family: Arial, sans-serif;
    max-width: 720px;
    margin: 30px auto;
    padding: 0 20px;
    font-size: 16px;
    line-height: 1.7;
    color: #222;
    background: #fff;
}

h1 { font-size: 1.5rem; margin-bottom: 2px; }
h2 { font-size: 1.2rem; margin-bottom: 4px; color: #444; font-weight: normal; }
h3 { font-size: 1.1rem; margin-top: 30px; margin-bottom: 6px; }
h4 { font-size: 1rem; margin-top: 20px; margin-bottom: 4px; }
p  { margin-bottom: 12px; }

nav {
    margin: 14px 0 30px;
    padding: 8px 0;
    border-top: 1px solid #ccc;
    border-bottom: 1px solid #ccc;
}

nav a {
    margin-right: 14px;
    color: #333;
    text-decoration: none;
    font-size: 0.88rem;
}

nav a:hover       { text-decoration: underline; }
nav a.active      { font-weight: bold; color: #000; }

img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 16px 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 0.95rem;
}

th, td {
    border: 1px solid #bbb;
    padding: 7px 12px;
    text-align: left;
}

th { background: #f0f0f0; }

caption {
    text-align: left;
    font-weight: bold;
    margin-bottom: 6px;
}

ol { padding-left: 22px; }
ol li { margin-bottom: 10px; }
ol li img { width: 70px; height: auto; display: inline; margin: 0; }

footer {
    margin-top: 50px;
    padding-top: 12px;
    border-top: 1px solid #ccc;
    font-size: 0.8rem;
    color: #999;
}