/* Blog-only reading themes; the shared header, footer and other pages keep their design. */
[data-blog-theme] .blog-surface {
    --blog-bg: #0a101d;
    --blog-text: #edf4f6;
    --blog-muted: #b3c4ce;
    --blog-panel: #142333;
    --blog-line: #526879;
    --blog-link: #64ddd1;
    color-scheme: dark;
    background: var(--blog-bg);
    color: var(--blog-text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    overflow-wrap: anywhere;
}

[data-blog-theme="light"] .blog-surface {
    --blog-bg: #ffffff;
    --blog-text: #182f40;
    --blog-muted: #526773;
    --blog-panel: #eef5f6;
    --blog-line: #7c919b;
    --blog-link: #006b63;
    color-scheme: light;
}

.blog-surface :is(h1, h2, h3, h4) {
    color: var(--blog-text);
    font-family: inherit;
    font-weight: 700;
    letter-spacing: -.025em;
}

.blog-surface a { color: var(--blog-link); }
.blog-surface a:hover { text-decoration: underline; text-underline-offset: 4px; }
.blog-surface :is(a, button):focus-visible {
    outline: 3px solid var(--blog-link);
    outline-offset: 5px;
}

.blog-surface :is(.article-shell, .related-posts) {
    width: min(940px, 100%);
    margin-inline: auto;
    padding-inline: 28px;
}

.blog-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 18px;
    margin-bottom: 32px;
    font-size: 14px;
}
.blog-toolbar .breadcrumb { margin: 0; flex-wrap: wrap; color: var(--blog-muted); }
.blog-theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    min-height: 44px;
    padding: 10px;
    border: 1px solid var(--blog-line);
    border-radius: 999px;
    background: var(--blog-panel);
    color: var(--blog-text);
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
}
.blog-theme-toggle[hidden] { display: none; }
.blog-theme-toggle:hover { border-color: var(--blog-link); }

.blog-surface .blog-hero h1 { line-height: 1.18; }
.blog-surface .blog-hero > p { color: var(--blog-link); margin-bottom: 14px; font-weight: 600; }
.blog-surface .blog-hero div { color: var(--blog-muted); }
.blog-surface :is(.taxonomy-nav a, .tag-list a, .pagination a) {
    border-color: var(--blog-line);
    background: var(--blog-panel);
    color: var(--blog-link);
}
.blog-surface .pagination a.is-active {
    border-color: var(--blog-link);
    background: var(--blog-link);
    color: var(--blog-bg);
}

.blog-surface .blog-card {
    display: flex;
    flex-direction: column;
    background: var(--blog-panel);
    color: var(--blog-text);
    border-color: var(--blog-line);
    box-shadow: none;
}
.blog-surface .blog-card-image { aspect-ratio: 1200 / 630; border-bottom: 3px solid var(--blog-link); }
.blog-surface .blog-card-body { display: flex; flex: 1; flex-direction: column; }
.blog-surface .blog-card-meta { color: var(--blog-muted); font-size: 12px; line-height: 1.7; }
.blog-surface .blog-card h2 { color: var(--blog-text); font-size: 23px; line-height: 1.3; }
.blog-surface .blog-card h2 a { color: inherit; }
.blog-surface .blog-card h2 a:hover { color: var(--blog-link); }
.blog-surface .blog-card p { color: var(--blog-muted); font-size: 16px; line-height: 1.75; }
.blog-surface .blog-card .text-link { margin-top: auto; font-size: 15px; }

.blog-surface .article-header h1 { font-size: clamp(30px, 5vw, 48px); line-height: 1.18; margin-bottom: 20px; }
.blog-surface .article-header p { color: var(--blog-muted); font-size: 19px; line-height: 1.75; margin-bottom: 22px; }
.blog-surface .article-header > div { color: var(--blog-muted); font-size: 15px; }
.blog-surface .article-image { margin: 28px 0 34px; border-radius: 12px; }
.blog-surface .article-image img { aspect-ratio: auto; height: auto; }

.article-toc { margin: 32px 0 40px; font-size: 16px; line-height: 1.75; }
.article-toc p { margin-bottom: 12px; }
.article-toc ul { padding-left: 23px; margin: 0; }
.article-toc li { margin: 9px 0; }
.article-toc a { text-decoration: underline; text-underline-offset: 3px; }

.blog-surface .article-content { color: var(--blog-text); font-size: 19px; line-height: 1.75; }
.blog-surface .article-content :is(h2, h3, h4) { color: var(--blog-text); scroll-margin-top: 110px; }
.blog-surface .article-content h2 { font-size: clamp(24px, 3vw, 31px); line-height: 1.28; margin: 52px 0 18px; }
.blog-surface .article-content h3 { font-size: 22px; line-height: 1.35; margin: 32px 0 16px; }
.blog-surface .article-content h4 { font-size: 20px; }
.blog-surface .article-content :is(p, ul, ol) { margin: 0 0 22px; }
.blog-surface .article-content :is(ul, ol) { padding-left: 26px; }
.blog-surface .article-content li { margin: 10px 0; }
.blog-surface .article-content a { color: var(--blog-link); text-underline-offset: 3px; }
.blog-surface .article-content a:hover { text-decoration-thickness: 2px; }
.blog-surface .article-content blockquote {
    margin: 30px 0;
    padding: 22px 24px;
    background: var(--blog-panel);
    color: var(--blog-text);
    border-left: 4px solid var(--blog-link);
    font-style: normal;
}
.blog-surface .article-content blockquote > :last-child { margin-bottom: 0; }
.blog-surface .article-content img { margin: 28px auto; border-radius: 8px; }
.blog-surface .article-content em { color: inherit; }
.blog-surface .tag-list a { font-size: 14px; }
.blog-surface .related-posts { margin-top: 72px; }
.blog-surface .related-posts > h2 { color: var(--blog-text); font-size: 30px; line-height: 1.25; }
.blog-surface .related-posts .blog-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.blog-surface .empty-state { color: var(--blog-muted); text-align: center; }

@media (max-width: 900px) {
    .blog-surface .blog-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 600px) {
    .blog-surface { padding-top: 112px; padding-bottom: 56px; }
    .blog-surface :is(.article-shell, .related-posts) { padding-inline: 18px; }
    .blog-surface > .site-container { width: 100%; padding-inline: 18px; }
    .blog-surface .blog-grid, .blog-surface .related-posts .blog-grid { grid-template-columns: 1fr; }
    .blog-surface .article-content, .blog-surface .article-header p { font-size: 18px; }
    .blog-surface .article-content blockquote { padding: 18px; }
    .blog-surface .blog-hero h1 { font-size: 32px; }
    .blog-toolbar { gap: 12px; }
}

@media (prefers-reduced-motion: reduce) {
    [data-blog-theme] { scroll-behavior: auto; }
    .blog-surface .blog-card-image img { transition: none; }
}