/* [2026-05-27 Blog-4] Public blog renderer stylesheet.
 *
 * Four theme variants are switched via the `blog-theme-{key}` class set
 * on <body> by BlogHtmlBuilder. Each theme rebinds the CSS custom
 * properties on body for the page; the merchant's accent color +
 * heading + body font are injected via an inline <style> tag in the
 * <head> (so they don't have to ship as separate CSS rules).
 *
 * No JavaScript. No third-party fonts loaded. The font family is taken
 * from the merchant's saved value (Inter, Playfair Display, etc.) and
 * falls back to system fonts when the browser can't find it.
 */

:root {
  --blog-accent: #1a1a1a;
  --blog-font-heading: Inter, system-ui, -apple-system, sans-serif;
  --blog-font-body: Inter, system-ui, -apple-system, sans-serif;
  --blog-bg: #ffffff;
  --blog-fg: #1a1a1a;
  --blog-fg-muted: #57534e;
  --blog-border: #e7e5e4;
  --blog-card-bg: #fafaf9;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--blog-bg);
  color: var(--blog-fg);
  font-family: var(--blog-font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--blog-font-heading);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 1.4em 0 0.6em;
}

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

a:hover { text-decoration: underline; }

/* ── Header ───────────────────────────────────────────────────────── */

.blog-header {
  border-bottom: 1px solid var(--blog-border);
  padding: 1.5rem 1rem;
}

.blog-header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.blog-pub-name {
  font-family: var(--blog-font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.blog-pub-issue {
  font-size: 0.85rem;
  color: var(--blog-fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.blog-nav {
  display: flex;
  gap: 1.25rem;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.blog-nav a[aria-current="page"] {
  font-weight: 700;
  text-decoration: underline;
}

/* ── Listing page ─────────────────────────────────────────────────── */

.blog-index {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

.blog-index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.blog-empty {
  text-align: center;
  color: var(--blog-fg-muted);
  padding: 3rem 0;
}

.blog-card {
  background: var(--blog-card-bg);
  border: 1px solid var(--blog-border);
  border-radius: 4px;
  overflow: hidden;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.blog-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
}

.blog-card-link {
  display: block;
  color: var(--blog-fg);
  padding: 0;
}

.blog-card-link:hover { text-decoration: none; }

.blog-card-hero {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #f5f4f1;
}

.blog-card-hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.blog-card-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--blog-fg-muted);
  padding: 1rem 1rem 0;
}

.blog-card-label {
  font-weight: 700;
  color: var(--blog-accent);
}

.blog-card-title {
  font-size: 1.25rem;
  margin: 0.5rem 1rem 0.4rem;
  line-height: 1.3;
}

.blog-card-excerpt {
  margin: 0 1rem 0.75rem;
  font-size: 0.95rem;
  color: var(--blog-fg-muted);
  line-height: 1.5;
}

.blog-card-cta {
  display: inline-block;
  margin: 0 1rem 1.1rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--blog-accent);
}

/* ── Article page ─────────────────────────────────────────────────── */

.blog-post {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

.blog-byline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--blog-fg-muted);
  margin-bottom: 1rem;
}

.blog-byline-label,
.blog-byline-n {
  color: var(--blog-accent);
  font-weight: 700;
}

.blog-byline-sep { color: var(--blog-border); }

.blog-post-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.15;
  margin: 0 0 1.5rem;
}

.blog-post-hero {
  margin: 1.5rem 0 2rem;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #f5f4f1;
}

.blog-post-hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.blog-post-body {
  font-size: 1.05rem;
  line-height: 1.75;
}

.blog-post-body p { margin: 1.25em 0; }
.blog-post-body h2 { font-size: 1.6rem; margin-top: 2em; }
.blog-post-body h3 { font-size: 1.25rem; margin-top: 1.6em; }
.blog-post-body ul,
.blog-post-body ol { padding-left: 1.5em; }
.blog-post-body blockquote {
  margin: 1.5em 0;
  padding: 0.5em 1.2em;
  border-left: 3px solid var(--blog-accent);
  color: var(--blog-fg-muted);
  font-style: italic;
}
.blog-post-body code {
  background: var(--blog-card-bg);
  padding: 0.1em 0.4em;
  border-radius: 3px;
  font-size: 0.92em;
}
.blog-post-body pre {
  background: var(--blog-card-bg);
  padding: 1em;
  overflow-x: auto;
  border-radius: 4px;
}
.blog-post-body pre code { background: transparent; padding: 0; }
.blog-post-body img { max-width: 100%; height: auto; }
.blog-post-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.5em 0;
  font-size: 0.95em;
}
.blog-post-body th,
.blog-post-body td {
  border: 1px solid var(--blog-border);
  padding: 0.5em 0.75em;
  text-align: left;
}

.blog-post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 2rem 0 1.5rem;
}

.blog-tag {
  font-size: 0.78rem;
  background: var(--blog-card-bg);
  border: 1px solid var(--blog-border);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  color: var(--blog-fg-muted);
}

/* ── AI disclosure (Blog-4 invariant 3, layer 2) ──────────────────── */

.ai-disclosure {
  margin: 2.5rem 0 0;
  padding: 1rem 1.2rem;
  border-top: 1px solid var(--blog-border);
  font-size: 0.85rem;
  color: var(--blog-fg-muted);
  display: flex;
  gap: 0.5rem;
  align-items: baseline;
}

.ai-disclosure em { font-style: italic; }

/* ── Related posts ────────────────────────────────────────────────── */

.blog-related {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--blog-border);
}

.blog-related h2 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--blog-fg-muted);
  margin: 0 0 1rem;
}

.blog-related ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.blog-related li {
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--blog-border);
}

.blog-related li:last-child { border-bottom: 0; }

/* ── Theme: dark-magazine ────────────────────────────────────────── */

body.blog-theme-dark-magazine {
  --blog-bg: #0e0e0e;
  --blog-fg: #f1ede8;
  --blog-fg-muted: #a6a09a;
  --blog-border: #2a2825;
  --blog-card-bg: #1a1816;
}

body.blog-theme-dark-magazine .blog-card-hero { background: #2a2825; }
body.blog-theme-dark-magazine .blog-post-hero { background: #2a2825; }

/* ── Theme: light-minimal ────────────────────────────────────────── */

body.blog-theme-light-minimal {
  --blog-bg: #ffffff;
  --blog-fg: #1a1a1a;
  --blog-fg-muted: #6b6b6b;
  --blog-border: #ececec;
  --blog-card-bg: #fafafa;
}

body.blog-theme-light-minimal .blog-card {
  border-radius: 0;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--blog-border);
}

body.blog-theme-light-minimal .blog-card:hover {
  transform: none;
  box-shadow: none;
}

/* ── Theme: newsroom ─────────────────────────────────────────────── */

body.blog-theme-newsroom {
  --blog-bg: #fbfaf6;
  --blog-fg: #1c1a16;
  --blog-fg-muted: #5b5751;
  --blog-border: #d8d4cc;
  --blog-card-bg: #ffffff;
}

body.blog-theme-newsroom .blog-pub-name {
  font-family: var(--blog-font-heading), Georgia, serif;
  font-size: 2rem;
  font-style: italic;
}

body.blog-theme-newsroom .blog-card-title {
  font-family: var(--blog-font-heading), Georgia, serif;
}

/* ── Responsive ───────────────────────────────────────────────────── */

@media (max-width: 600px) {
  .blog-header-inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .blog-post-title { font-size: 1.7rem; }
  .blog-post-body { font-size: 1rem; line-height: 1.7; }
  .blog-byline { font-size: 0.7rem; gap: 0.4rem; }
}
