:root {
    --primary-color: #333;
    --text-color: #444;
    --bg-color: #fff;
    --link-color: #0066cc;
    --border-color: #e0e0e0;
    --max-width: 800px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

header {
    border-bottom: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
}

header a {
    color: var(--primary-color);
    text-decoration: none;
}

main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem 1rem;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

p {
    margin-bottom: 1rem;
}

a {
    color: var(--link-color);
}

a:hover {
    text-decoration: underline;
}

ul, ol {
    margin-bottom: 1rem;
    padding-left: 2rem;
}

li {
    margin-bottom: 0.5rem;
}

time {
    color: #666;
    font-size: 0.9rem;
    margin-left: 0.5rem;
}

pre {
    background-color: #f5f5f5;
    padding: 1rem;
    overflow-x: auto;
    margin-bottom: 1rem;
    border-radius: 4px;
}

code {
    background-color: #f5f5f5;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Courier New', Courier, monospace;
}

blockquote {
    border-left: 4px solid var(--border-color);
    padding-left: 1rem;
    margin: 1rem 0;
    font-style: italic;
}

footer {
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
    color: #666;
    font-size: 0.9rem;
}

.tags {
    margin-top: 0.5rem;
}

.tag {
    display: inline-block;
    background-color: #f0f0f0;
    color: var(--text-color);
    padding: 0.25rem 0.5rem;
    border-radius: 3px;
    text-decoration: none;
    font-size: 0.85rem;
    margin-right: 0.5rem;
}

.tag:hover {
    background-color: #e0e0e0;
    text-decoration: none;
}

.same-month-posts {
    margin-top: 3rem;
    padding: 1.5rem;
    background-color: #f8f8f8;
    border-radius: 8px;
}

.same-month-posts h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.same-month-posts ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.same-month-posts li {
    margin-bottom: 0.5rem;
}

.same-month-posts a {
    color: var(--link-color);
    text-decoration: none;
}

.same-month-posts a:hover {
    text-decoration: underline;
}

article header {
    margin-bottom: 2rem;
}

article header h1 {
    margin-bottom: 0.5rem;
    font-size: 2rem;
}

article h1 {
    font-size: 1.75rem;
}

article h2 {
    font-size: 1.5rem;
}

article h3 {
    font-size: 1.25rem;
}

article h4 {
    font-size: 1.1rem;
}

article h5, article h6 {
    font-size: 1rem;
}

article header time {
    display: block;
    margin-bottom: 0.5rem;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}