body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    margin: 60px auto;
    max-width: 650px;
    line-height: 1.6;
    font-size: 18px;
    color: #444;
    padding: 0 10px;
    background-color: #fcfcfc;
}

.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    width: 100%;
}

.main-nav a, .nav-brand a {
    text-decoration: none;
    color: #444;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 1.1em;
}

.main-nav a:hover, .nav-brand a:hover {
    color: #003d80;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-brand {
    font-weight: bold;
}

h1, h2, h3 {
    line-height: 1.2;
}

.blog-list {
    list-style-type: none;
    padding: 0;
    margin-top: 60px;
}

.blog-list-item {
    margin-bottom: 30px;
}

.blog-list-item a {
    text-decoration: none;
    color: #444;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.blog-list-item a:hover {
    color: #003d80;
}

.blog-list-title {
    font-family: Georgia, serif;
    font-size: 1.2em;
}

.blog-list-time {
    color: #888;
    font-size: 0.9em;
}

.about-section {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 20px;
    align-items: start;
}

.about-image img {
    max-width: 100%;
    border-radius: 8px;
}

.dark-mode-toggle {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.dark-mode-toggle .moon {
    display: none;
}

body.dark-mode .dark-mode-toggle .sun {
    display: none;
}

body.dark-mode .dark-mode-toggle .moon {
    display: block;
}