/* RakuAI Blog — reading-optimized layout, dark by default. */

:root {
    --blog-serif: Charter, "Iowan Old Style", "Source Serif Pro", Georgia, "Times New Roman", serif;
    --blog-text: #d8d8e6;
    --blog-text-strong: #f3f3fa;
    --blog-muted: #8d8db0;
    --blog-rule: rgba(108, 92, 231, 0.18);
    --blog-code-bg: #14142b;
    --blog-inline-code-bg: rgba(163, 136, 255, 0.12);
}

.blog-hero {
    padding: 64px 0 32px;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    border-bottom: 1px solid var(--blog-rule);
    text-align: center;
}
.blog-hero h1 {
    font-size: 2.6rem;
    font-weight: 800;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--accent-bright), var(--success));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.blog-hero .subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}
.blog-hero .rss-link {
    margin-top: 16px;
    font-size: 0.9rem;
}
.blog-hero .rss-link a {
    color: var(--accent-bright);
    text-decoration: none;
}
.blog-hero .rss-link a:hover { text-decoration: underline; }
.blog-hero .series-eyebrow {
    color: var(--blog-muted);
    font-size: 0.85rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 12px;
}
.blog-hero .series-eyebrow a {
    color: var(--accent-bright);
    text-decoration: none;
}

.blog-main {
    max-width: 680px;
    margin: 0 auto;
    padding: 56px 24px 96px;
}
.blog-list { padding-top: 48px; }

.post-card {
    border-bottom: 1px solid var(--blog-rule);
    padding: 28px 0;
}
.post-card:first-child { padding-top: 0; }
.post-card:last-child { border-bottom: none; }
.post-card h2 {
    font-family: var(--blog-serif);
    font-size: 1.65rem;
    line-height: 1.25;
    margin-bottom: 8px;
    font-weight: 700;
}
.post-card h2 a {
    color: var(--blog-text-strong);
    text-decoration: none;
}
.post-card h2 a:hover { color: var(--accent-bright); }
.post-card .series-num {
    color: var(--blog-muted);
    margin-right: 6px;
    font-weight: 400;
}
.post-card .post-meta {
    color: var(--blog-muted);
    font-size: 0.9rem;
    margin-bottom: 10px;
}
.post-card .post-excerpt {
    color: var(--blog-text);
    font-family: var(--blog-serif);
    font-size: 1.05rem;
    line-height: 1.55;
}
.post-empty {
    color: var(--blog-muted);
    font-style: italic;
    text-align: center;
    padding: 48px 0;
}

/* Article view */
.post-header {
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--blog-rule);
}
.post-header h1 {
    font-family: var(--blog-serif);
    font-size: 2.4rem;
    line-height: 1.18;
    color: var(--blog-text-strong);
    margin-bottom: 14px;
    font-weight: 700;
    letter-spacing: -0.01em;
}
.post-header .post-meta {
    color: var(--blog-muted);
    font-size: 0.92rem;
}
.post-header .post-meta-sep { margin: 0 8px; }
.series-breadcrumb {
    font-size: 0.85rem;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
.series-breadcrumb a {
    color: var(--accent-bright);
    text-decoration: none;
}
.series-breadcrumb a:hover { text-decoration: underline; }

.post-body {
    font-family: var(--blog-serif);
    font-size: 19px;
    line-height: 1.75;
    color: var(--blog-text);
}
.post-body > * + * { margin-top: 1.2em; }
.post-body h2 {
    font-size: 1.55rem;
    margin-top: 2.2em;
    color: var(--blog-text-strong);
    font-weight: 700;
    line-height: 1.3;
}
.post-body h3 {
    font-size: 1.25rem;
    margin-top: 1.8em;
    color: var(--blog-text-strong);
    font-weight: 700;
    line-height: 1.35;
}
.post-body a {
    color: var(--accent-bright);
    text-decoration: underline;
    text-decoration-color: rgba(163, 136, 255, 0.35);
    text-underline-offset: 3px;
}
.post-body a:hover { text-decoration-color: var(--accent-bright); }
.post-body strong { color: var(--blog-text-strong); }
.post-body blockquote {
    border-left: 3px solid var(--accent);
    padding: 4px 0 4px 20px;
    color: var(--blog-muted);
    font-style: italic;
}
.post-body ul, .post-body ol { padding-left: 1.6em; }
.post-body li + li { margin-top: 0.4em; }
.post-body hr {
    border: 0;
    border-top: 1px solid var(--blog-rule);
    margin: 2.4em auto;
    max-width: 200px;
}
.post-body img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    display: block;
    margin: 1.6em auto;
}
.post-body code {
    font-family: "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    font-size: 0.92em;
    background: var(--blog-inline-code-bg);
    color: var(--blog-text-strong);
    padding: 2px 6px;
    border-radius: 4px;
}
.post-body pre {
    background: var(--blog-code-bg);
    border: 1px solid var(--blog-rule);
    border-radius: 8px;
    padding: 18px 20px;
    overflow-x: auto;
    font-size: 0.88rem;
    line-height: 1.55;
}
.post-body pre code {
    background: transparent;
    padding: 0;
    font-size: inherit;
    color: inherit;
}
.post-body table {
    border-collapse: collapse;
    width: 100%;
    font-size: 0.95rem;
}
.post-body th, .post-body td {
    border: 1px solid var(--blog-rule);
    padding: 8px 12px;
    text-align: left;
}
.post-body th {
    background: var(--bg-secondary);
    color: var(--blog-text-strong);
}

.post-tags {
    list-style: none;
    padding: 0;
    margin: 36px 0 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.post-tags li {
    background: var(--bg-secondary);
    border: 1px solid var(--blog-rule);
    color: var(--blog-muted);
    border-radius: 999px;
    padding: 4px 12px;
    font-size: 0.78rem;
    text-transform: lowercase;
}

.post-series-nav {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--blog-rule);
    font-size: 0.95rem;
}
.post-series-nav a {
    color: var(--accent-bright);
    text-decoration: none;
    max-width: 48%;
}
.post-series-nav a:hover { text-decoration: underline; }
.post-series-nav .nav-next { margin-left: auto; text-align: right; }

.post-back {
    margin-top: 56px;
    text-align: center;
    font-size: 0.9rem;
}
.post-back a {
    color: var(--blog-muted);
    text-decoration: none;
}
.post-back a:hover { color: var(--accent-bright); }

.blog-footer {
    border-top: 1px solid var(--blog-rule);
    padding: 32px 0;
    text-align: center;
    color: var(--blog-muted);
    font-size: 0.85rem;
}
.blog-footer a {
    color: var(--blog-muted);
    text-decoration: none;
}
.blog-footer a:hover { color: var(--accent-bright); }

/* Aria-current marker on the active nav link, mirrors :hover state */
nav .nav-links a[aria-current="page"] {
    color: var(--text-primary);
}

@media (max-width: 600px) {
    .blog-main { padding: 36px 20px 64px; }
    .blog-hero { padding: 48px 0 24px; }
    .blog-hero h1 { font-size: 2rem; }
    .post-header h1 { font-size: 1.85rem; }
    .post-body { font-size: 18px; }
    .post-series-nav { flex-direction: column; }
    .post-series-nav .nav-next { margin-left: 0; text-align: left; }
}

@media (prefers-color-scheme: light) {
    /* Site is dark-only; intentional no-op so the article still reads well
       when the user agent forces dark mode rendering. */
}