body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    color: #333;
}

header {
    margin-bottom: 2rem;
    border-bottom: 1px solid #eee;
    padding-bottom: 1rem;
}

header h1 a {
    text-decoration: none;
    color: #333;
}

nav ul {
    list-style: none;
    padding: 0;
    display: flex;
    gap: 1rem;
}

nav a {
    text-decoration: none;
    color: #007bff;
}

.post-item {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px dashed #eee;
}

.post-item h2 {
    margin-bottom: 0.5rem;
}

.post-item .date {
    color: #666;
    font-size: 0.9rem;
}

.post-item .summary {
    margin: 0.5rem 0;
}

.tag-list {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

.tag {
    background: #f0f0f0;
    padding: 0.2rem 0.5rem;
    border-radius: 3px;
    font-size: 0.8rem;
    text-decoration: none;
    color: #666;
}

.post-image {
    max-width: 100%;
    height: auto;
    margin-bottom: 1rem;
    border-radius: 8px;
}

footer {
    margin-top: 4rem;
    padding-top: 1rem;
    border-top: 1px solid #eee;
    color: #666;
    text-align: center;
}

.year-group, .tag-group {
    margin-top: 3rem;
    border-left: 4px solid #eee;
    padding-left: 1rem;
}

.year-group h2, .tag-group h2 {
    color: #999;
}