body {
    font-family: 'Monaco', 'Consolas', monospace;
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
    color: #000000;
    background: #ffffff;
    line-height: 1.6;
}

h1, h2, h3 {
    border-bottom: 1px solid #cccccc;
    padding-bottom: 8px;
    margin-top: 30px;
}

.nav {
    margin: 25px 0;
    padding-bottom: 15px;
    border-bottom: 1px solid #eee;
}

.nav a {
    margin-right: 20px;
    color: #000;
    text-decoration: none;
    border-bottom: 1px dashed #000;
    padding-bottom: 2px;
}

.nav a:hover {
    border-bottom: 1px solid #000;
}

.project, .memo {
    margin: 25px 0;
    padding: 15px;
    border-left: 3px solid #000;
    background: #f9f9f9;
}

footer {
    margin-top: 50px;
    padding-top: 20px;
    border-top: 1px solid #ccc;
    font-size: 0.9em;
    color: #666;
}

a {
    color: #000;
    text-decoration: none;
    border-bottom: 1px dashed #000;
}

a:hover {
    border-bottom: 1px solid #000;
}

.github-btn {
    display: inline-block;
    margin-top: 10px;
    padding: 8px 14px;
    background-color: #24292e;
    color: #ffffff;
    text-decoration: none;
    font-size: 0.9rem;
    border-radius: 6px;
    transition: background-color 0.2s ease;
}

.github-btn:hover {
    background-color: #0366d6;
}

p {
    margin: 15px 0;
}