/*
 * Blog — public editorial surface (FEAT-47).
 * Loaded only on blog pages via content_for(:head). Uses design tokens from
 * application.css; light/dark handled by those tokens.
 */

.blog {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: clamp(2rem, 6vw, 4.5rem) clamp(1rem, 5vw, 2rem) 4rem;
}

/* ── Index header ─────────────────────────────────────────────────────────── */

.blog__header {
  max-width: 40rem;
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}

.blog__title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
}

.blog__tagline {
  margin-top: 0.75rem;
  font-size: var(--text-lg);
  line-height: var(--leading-normal);
  color: var(--color-muted);
}

/* ── Card grid ────────────────────────────────────────────────────────────── */

.blog__grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 18rem), 1fr));
  gap: clamp(1.25rem, 3vw, 2rem);
}

.blog-card {
  min-width: 0;
}

.blog-card__link {
  display: flex;
  flex-direction: column;
  height: 100%;
  border: 1px solid var(--color-border-muted);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.blog-card__link:hover {
  border-color: var(--color-border);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.blog-card__link:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.blog-card__cover {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--color-placeholder-bg);
}

/* Branded fallback cover — shown when an article has no resolvable cover image.
   A restrained SOTC monogram on a soft, token-driven ground; works light + dark.
   Shared by the index card and the article hero. */
.blog-card__cover--placeholder,
.blog-article__hero--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 16 / 9;
  background:
    radial-gradient(135% 120% at 50% -10%,
      var(--color-surface-raised) 0%,
      var(--color-surface) 65%);
  box-shadow: inset 0 0 0 1px var(--color-border-muted);
}

.blog-cover-fallback__mark {
  font-family: var(--font-display);
  letter-spacing: var(--tracking-widest);
  text-indent: var(--tracking-widest); /* offset trailing tracking to re-center */
  line-height: 1;
  color: var(--color-subtle);
}

.blog-card__cover--placeholder .blog-cover-fallback__mark {
  font-size: var(--text-2xl);
}

.blog-article__hero--placeholder .blog-cover-fallback__mark {
  font-size: clamp(2rem, 7vw, 3.5rem);
}

.blog-card__body {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.1rem 1.2rem 1.3rem;
}

.blog-card__date {
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-subtle);
}

.blog-card__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  line-height: var(--leading-snug);
  color: var(--color-text);
}

.blog-card__summary {
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  color: var(--color-muted);
}

/* ── Empty state ──────────────────────────────────────────────────────────── */

.blog__empty {
  padding: clamp(2.5rem, 8vw, 5rem) 1rem;
  text-align: center;
  font-size: var(--text-lg);
  color: var(--color-muted);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-lg);
}

/* ── Sign-up CTA ──────────────────────────────────────────────────────────── */

.blog-cta {
  margin-top: clamp(3rem, 8vw, 5rem);
  border-top: 1px solid var(--color-border-muted);
  padding-top: clamp(2.5rem, 6vw, 4rem);
}

.blog-cta__inner {
  max-width: 36rem;
  margin: 0 auto;
  text-align: center;
}

.blog-cta__heading {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  line-height: var(--leading-tight);
  color: var(--color-text);
}

.blog-cta__subcopy {
  margin: 0.75rem 0 1.6rem;
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--color-muted);
}

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

.blog-article {
  --reading-measure: 42rem;
  max-width: var(--reading-measure);
  margin: 0 auto;
  padding: clamp(1.5rem, 5vw, 3rem) clamp(1rem, 5vw, 1.5rem) 4rem;
}

/* The hero is just a layout container so a credit caption can sit below the
   rounded image without being clipped. Rounding lives on the image/placeholder. */
.blog-article__hero {
  margin: 0 0 clamp(1.5rem, 4vw, 2.5rem);
}

.blog-article__hero-img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-lg);
  background: var(--color-placeholder-bg);
}

/* .blog-article__hero--placeholder shares the branded fallback with the card
   placeholder above; it just needs its own rounding (no clipping figure now). */
.blog-article__hero--placeholder {
  border-radius: var(--radius-lg);
}

.blog-article__credit {
  margin-top: 0.5rem;
  font-size: var(--text-xs);
  line-height: var(--leading-normal);
  color: var(--color-subtle);
  text-align: right;
}

.blog-article__credit a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--color-border);
}

.blog-article__credit a:hover {
  color: var(--color-muted);
  text-decoration-color: var(--color-muted);
}

.blog-article__header {
  margin-bottom: clamp(1.5rem, 4vw, 2.25rem);
}

.blog-article__date {
  display: block;
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-subtle);
  margin-bottom: 0.6rem;
}

.blog-article__title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
}

/* Long-form prose. Body HTML is rendered from Markdown by Article. */
.blog-article__body {
  font-size: var(--text-md);
  line-height: var(--leading-relaxed);
  color: var(--color-muted);
  overflow-wrap: break-word;
}

.blog-article__body > * + * {
  margin-top: 1.1rem;
}

.blog-article__body h1,
.blog-article__body h2,
.blog-article__body h3,
.blog-article__body h4 {
  font-family: var(--font-display);
  color: var(--color-text);
  line-height: var(--leading-snug);
  margin-top: 2.2rem;
}

.blog-article__body h1 { font-size: var(--text-2xl); }
.blog-article__body h2 { font-size: var(--text-xl); }
.blog-article__body h3 { font-size: var(--text-lg); }
.blog-article__body h4 { font-size: var(--text-md); }

.blog-article__body a {
  color: var(--color-text);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--color-border);
  transition: text-decoration-color var(--duration-fast) var(--ease-out);
}

.blog-article__body a:hover {
  text-decoration-color: var(--color-text);
}

.blog-article__body ul,
.blog-article__body ol {
  padding-left: 1.4rem;
}

.blog-article__body li + li {
  margin-top: 0.35rem;
}

.blog-article__body blockquote {
  margin-left: 0;
  padding-left: 1rem;
  border-left: 3px solid var(--color-border);
  color: var(--color-subtle);
  font-style: italic;
}

.blog-article__body img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.blog-article__body code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-surface-raised);
  padding: 0.1em 0.35em;
  border-radius: var(--radius-sm);
}

.blog-article__body pre {
  background: var(--color-surface-raised);
  border-radius: var(--radius-md);
  padding: 1rem;
  overflow-x: auto;
}

.blog-article__body pre code {
  background: none;
  padding: 0;
}

@media (max-width: 600px) {
  .blog-article__title { font-size: var(--text-3xl); }
}