body {
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    line-height: 1.8;
    color: #000000;
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
    background-color: #ffffff;
}
header {
    border-bottom: 5px solid #ff8c00;
    margin-bottom: 40px;
    padding-bottom: 15px;
}
h1, h2, h3 { color: #000000; }
h2 {
    font-size: 1.5em;
    border-left: 12px solid #ff8c00;
    padding: 8px 0 8px 15px;
    margin-top: 50px;
    background-color: #fff4e6;
    border-bottom: 1px solid #ff8c00;
}
pre {
    background-color: #000000;
    color: #ffffff;
    padding: 20px;
    overflow-x: auto;
    font-family: "Consolas", "Monaco", monospace;
    font-size: 1em;
    border: 1px solid #ff8c00;
}
a {
    color: #000000;
    text-decoration: underline;
    font-weight: bold;
}
a:hover {
    color: #ff8c00;
    background-color: #fff4e6;
}
ul { list-style: none; padding: 0; }
li {
    margin-bottom: 15px;
    padding-left: 25px;
    position: relative;
}
li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 10px;
    height: 5px;
    background-color: #ff8c00;
}
.update-section {
    border: 3px double #ff8c00;
    padding: 20px;
    margin-top: 50px;
}