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

:root {
    --bg-color: #ffffff;
    --text-color: #1a1a1a;
    --accent-color: #2563eb;
    --border-color: #e5e5e5;
    --code-bg: #f5f5f5;
    --link-color: #2563eb;
    --link-hover: #1d4ed8;
    --meta-color: #6b7280;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0f0f0f;
        --text-color: #e5e5e5;
        --accent-color: #60a5fa;
        --border-color: #262626;
        --code-bg: #1a1a1a;
        --link-color: #60a5fa;
        --link-hover: #93c5fd;
        --meta-color: #9ca3af;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
    font-size: 17px;
}

.container {
    max-width: 768px;
    margin: 0 auto;
    padding: 60px 24px;
}

header {
    margin-bottom: 60px;
}

header h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 8px;
    letter-spacing: -0.03em;
}

header .description {
    font-size: 1.1rem;
    color: var(--meta-color);
}

nav {
    margin-top: 16px;
}

nav a {
    color: var(--meta-color);
    text-decoration: none;
    font-size: 0.95rem;
    margin-right: 20px;
}

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

.posts {
    display: flex;
    flex-direction: column;
    gap: 48px;
}

.post {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 48px;
}

.post:last-child {
    border-bottom: none;
}

.post-meta {
    font-size: 0.9rem;
    color: var(--meta-color);
    margin-bottom: 8px;
}

.post h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.post h2 a {
    color: var(--text-color);
    text-decoration: none;
}

.post h2 a:hover {
    color: var(--link-color);
}

.post-summary {
    opacity: 0.85;
    line-height: 1.6;
    margin-bottom: 16px;
}

.post-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    font-size: 0.8rem;
    background: var(--code-bg);
    padding: 4px 12px;
    border-radius: 9999px;
    color: var(--meta-color);
}

.article {
    max-width: 720px;
    margin: 0 auto;
}

.article-header {
    margin-bottom: 40px;
}

.article-header h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.03em;
}

.article-meta {
    font-size: 0.95rem;
    color: var(--meta-color);
}

.article-content {
    line-height: 1.8;
}

.article-content p {
    margin-bottom: 24px;
}

.article-content h2 {
    font-size: 1.6rem;
    margin-top: 48px;
    margin-bottom: 16px;
    font-weight: 700;
}

.article-content h3 {
    font-size: 1.3rem;
    margin-top: 32px;
    margin-bottom: 12px;
    font-weight: 600;
}

.article-content ul, .article-content ol {
    margin-bottom: 24px;
    padding-left: 24px;
}

.article-content li {
    margin-bottom: 8px;
}

.article-content code {
    background: var(--code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
}

.article-content pre {
    background: var(--code-bg);
    padding: 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 24px;
}

.article-content pre code {
    background: none;
    padding: 0;
}

.article-content a {
    color: var(--link-color);
}

.article-content a:hover {
    color: var(--link-hover);
}

.article-content blockquote {
    border-left: 3px solid var(--accent-color);
    padding-left: 20px;
    margin: 24px 0;
    opacity: 0.85;
    font-style: italic;
}

.article-content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 48px 0;
}

.archive-section {
    margin-bottom: 48px;
}

.archive-section h2 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: var(--meta-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.85rem;
}

.archive-list {
    list-style: none;
}

.archive-item {
    margin-bottom: 16px;
}

.archive-item a {
    color: var(--text-color);
    text-decoration: none;
}

.archive-item a:hover {
    color: var(--link-color);
}

.archive-date {
    color: var(--meta-color);
    font-size: 0.9rem;
    margin-left: 12px;
}

footer {
    margin-top: 80px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--meta-color);
}

.back-link {
    display: inline-block;
    margin-bottom: 24px;
    color: var(--link-color);
    text-decoration: none;
    font-size: 0.95rem;
}

.back-link:hover {
    text-decoration: underline;
}

@media (max-width: 640px) {
    body {
        font-size: 16px;
    }

    header h1 {
        font-size: 1.8rem;
    }

    .container {
        padding: 40px 16px;
    }
}