/* ==========================================================================
   OK Studios — blog stylesheet
   Listing grid + long-form article prose. Built on the shared design tokens
   in base.css (--paper, --ink, --purple, --line, --font-display, ...).
   ========================================================================== */

/* ---- Shared: page intro for /blog ---------------------------------------- */
.blog-head {
  padding: clamp(2.5rem, 7vh, 5rem) 0 clamp(2rem, 5vh, 3rem);
  max-width: 60ch;
}
.blog-head h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.4rem, 6vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--ink);
}
.blog-head h1 .accent { color: var(--purple); }
.blog-head p {
  margin-top: 1.2rem;
  font-size: clamp(1.02rem, 2vw, 1.2rem);
  line-height: 1.6;
  color: var(--ink-soft);
}

/* ---- Section chips ------------------------------------------------------- */
.blog-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: clamp(1.5rem, 3vh, 2.2rem);
}
.blog-chips .chip {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--tag-bg);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.blog-chips .chip:hover { color: var(--ink); border-color: color-mix(in srgb, var(--purple) 40%, var(--line)); }
.blog-chips .chip.active {
  color: #fff;
  background: var(--purple);
  border-color: transparent;
}

/* ---- Listing grid -------------------------------------------------------- */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
  margin-bottom: clamp(3rem, 8vh, 5rem);
}
.post-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding: clamp(1.5rem, 3vw, 2rem);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
  min-height: 230px;
}
.post-card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--purple) 40%, var(--line)); }
.post-card::after {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 2px;
  background: var(--purple);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease-out);
}
.post-card:hover { background: var(--tag-bg); }
.post-card:hover::after { transform: scaleX(1); }
.post-card:focus-visible { outline: 2px solid var(--purple); outline-offset: -2px; }

/* cover image at top of card (optional — when post has `cover:` in frontmatter) */
.post-card .cover {
  margin: calc(-1 * clamp(1.5rem, 3vw, 2rem)) calc(-1 * clamp(1.5rem, 3vw, 2rem)) 0;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.post-card .cover img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s var(--ease-out);
}
.post-card.has-cover:hover .cover img { transform: scale(1.03); }

/* small section pill on the card */
.post-card .section-badge {
  align-self: flex-start;
  font-family: var(--font-display);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--purple);
  background: color-mix(in srgb, var(--purple) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--purple) 28%, transparent);
  padding: 0.3rem 0.65rem;
  border-radius: 999px;
}

.post-card .meta {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--purple);
  display: flex;
  gap: 0.6rem;
  align-items: center;
}
.post-card .meta .sep { color: var(--ink-soft); opacity: 0.6; }
.post-card h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.25rem, 1.9vw, 1.55rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.post-card .excerpt {
  font-size: 0.94rem;
  line-height: 1.6;
  color: var(--ink-soft);
  flex: 1;
}
.post-card .more {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
}
.post-card .more .arr { color: var(--purple); transition: transform 0.25s ease; }
.post-card:hover .more .arr { transform: translateX(3px); }

.blog-empty {
  border: 1px dashed var(--line);
  border-radius: 18px;
  padding: clamp(2.5rem, 6vw, 4rem);
  text-align: center;
  color: var(--ink-soft);
  margin-bottom: 4rem;
}

/* ---- Article (single post) ---------------------------------------------- */
.article {
  width: 100%;
  max-width: 720px;
  margin-inline: auto;
  padding: clamp(2.5rem, 7vh, 5rem) 0 clamp(3rem, 8vh, 5rem);
}
.article .back {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-decoration: none;
  margin-bottom: 2rem;
  transition: color 0.2s ease;
}
.article .back:hover { color: var(--purple); }
.article .back .arr { color: var(--purple); transition: transform 0.2s ease; }
.article .back:hover .arr { transform: translateX(-3px); }

.article-head .meta {
  font-family: var(--font-display);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--purple);
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  margin-bottom: 1.1rem;
}
.article-head .meta .sep { color: var(--ink-soft); opacity: 0.6; }
.article-head h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--ink);
}
.article-head .byline {
  margin-top: 1.3rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
}
.article-head .byline strong { color: var(--ink); font-weight: 600; }

.article-cover {
  margin: clamp(2rem, 5vh, 3rem) 0 0;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
}
.article-cover img { display: block; width: 100%; height: auto; }

/* ---- Prose --------------------------------------------------------------- */
.prose {
  margin-top: clamp(2rem, 5vh, 3rem);
  font-size: 1.08rem;
  line-height: 1.75;
  color: var(--ink);
}
.prose > * + * { margin-top: 1.35em; }
.prose h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 3vw, 1.85rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-top: 2.2em;
  color: var(--ink);
}
.prose h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.18rem, 2.2vw, 1.4rem);
  line-height: 1.25;
  margin-top: 1.8em;
  color: var(--ink);
}
.prose p { color: var(--ink); }
.prose a {
  color: var(--purple);
  text-decoration: none;
  border-bottom: 1.5px solid color-mix(in srgb, var(--purple) 45%, transparent);
  transition: border-color 0.2s ease;
}
.prose a:hover { border-color: var(--purple); }
.prose strong { font-weight: 600; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { margin-top: 0.5em; }
.prose ul li::marker { color: var(--purple); }
.prose ol li::marker { color: var(--purple); font-family: var(--font-display); font-weight: 600; }
.prose blockquote {
  border-left: 3px solid var(--purple);
  padding: 0.2em 0 0.2em 1.3em;
  color: var(--ink-soft);
  font-style: italic;
  font-size: 1.1rem;
}
.prose code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: var(--tag-bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.12em 0.4em;
}
.prose pre {
  background: var(--tag-bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.1rem 1.25rem;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.6;
}
.prose pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
}
.prose img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--line);
}
.prose hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 2.4em 0;
}

/* ---- Article footer / CTA ------------------------------------------------ */
.article-cta {
  max-width: 720px;
  margin: 0 auto;
  border-top: 1px solid var(--line);
  padding-top: clamp(2rem, 5vh, 3rem);
  text-align: center;
}
.article-cta .eyebrow { justify-content: center; }
.article-cta p {
  font-size: 1.05rem;
  color: var(--ink-soft);
  margin-bottom: 1.4rem;
}
.article-cta .btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  background: var(--purple);
  color: #fff;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  box-shadow: 0 10px 28px -10px rgba(111, 0, 255, 0.55);
  transition: background 0.25s ease, transform 0.25s ease;
}
.article-cta .btn:hover { background: var(--purple-deep); transform: translateY(-1px); }