:root {
    --bg: #ffffff;
    --fg: #1a1a1a;
    --muted: #6b7280;
    --border: #e5e7eb;
    --link: #2563eb;
    --link-hover: #1d4ed8;
    --code-bg: #f3f4f6;
    --tag-bg: #e5e7eb;
    --tag-fg: #374151;
    --accent: #2563eb;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #111111;
        --fg: #e5e5e5;
        --muted: #9ca3af;
        --border: #2d2d2d;
        --link: #60a5fa;
        --link-hover: #93bbfd;
        --code-bg: #1e1e1e;
        --tag-bg: #2d2d2d;
        --tag-fg: #d1d5db;
        --accent: #60a5fa;
    }
}

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

html {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--fg);
    background: var(--bg);
}

body {
    max-width: 72ch;
    margin: 0 auto;
    padding: 2rem 1rem;
}

header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 2rem;
}

.site-title {
    font-weight: 700;
    font-size: 1.2rem;
    text-decoration: none;
    color: var(--fg);
}

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

a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

footer {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.875rem;
}

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

.brief-list li {
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--border);
}

.brief-list li:last-child {
    border-bottom: none;
}

.brief-list time {
    font-size: 0.875rem;
    color: var(--muted);
}

.brief-list h2 {
    font-size: 1.25rem;
    margin: 0.25rem 0;
    line-height: 1.3;
}

.brief-list h2 a {
    color: var(--fg);
}

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

.summary {
    color: var(--muted);
    margin-top: 0.25rem;
}

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

.tag {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    background: var(--tag-bg);
    color: var(--tag-fg);
    border-radius: 3px;
    font-size: 0.8rem;
}

.tag:hover {
    text-decoration: none;
    background: var(--accent);
    color: var(--bg);
}

.breadcrumbs {
    color: var(--muted);
    font-size: 0.875rem;
    line-height: 1.5;
    margin-bottom: 1rem;
}

.breadcrumbs a {
    color: var(--muted);
}

article.brief header {
    margin-bottom: 2rem;
}

article.brief h1 {
    font-size: 1.75rem;
    line-height: 1.2;
    margin-bottom: 0.75rem;
}

.brief-meta {
    color: var(--muted);
    font-size: 0.875rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
}

.brief-content h1,
.brief-content h2,
.brief-content h3,
.brief-content h4 {
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}

.brief-content p {
    margin-bottom: 1em;
}

.brief-content ul,
.brief-content ol {
    margin-bottom: 1em;
    padding-left: 1.5em;
}

.brief-content blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 1em;
    margin: 1em 0;
    color: var(--muted);
}

.brief-content pre {
    background: var(--code-bg);
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
    margin-bottom: 1em;
    font-size: 0.875rem;
    line-height: 1.5;
}

.brief-content code {
    font-family: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, monospace;
    font-size: 0.9em;
}

.brief-content :not(pre) > code {
    background: var(--code-bg);
    padding: 0.125em 0.375em;
    border-radius: 3px;
}

.brief-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1em;
    font-size: 0.9rem;
}

.brief-content th,
.brief-content td {
    text-align: left;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
}

.brief-content th {
    background: var(--code-bg);
    font-weight: 600;
}

.brief-content img {
    max-width: 100%;
    height: auto;
}

.brief-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2em 0;
}

.brief-footer {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    font-size: 0.875rem;
}