/* ============================================================
   VELOCITY GTM — Blog (index grid + article)
   ============================================================ */

/* ---------- index hero ---------- */
.blog-hero {
  padding-top: clamp(40px, 5vw, 72px);
  padding-bottom: clamp(24px, 3vw, 40px);
}
.blog-hero .shead {
  max-width: 760px;
}

/* ---------- category filter row ---------- */
.cat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.8rem;
}
.cat-chip {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 500;
  padding: 0.5em 0.95em;
  border-radius: var(--r-pill);
  background: var(--surface);
  border: 1px solid var(--line-2);
  color: var(--ink-2);
  transition:
    background 0.16s ease,
    color 0.16s ease,
    border-color 0.16s ease;
  cursor: pointer;
}
.cat-chip:hover {
  border-color: var(--ink);
  color: var(--ink);
}
.cat-chip.active {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

/* ---------- featured lead post ---------- */
.featured {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--sh-sm);
  margin-bottom: 2.4rem;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    border-color 0.2s ease;
}
.featured:hover {
  transform: translateY(-3px);
  box-shadow: var(--sh-lg);
  border-color: var(--line-2);
}
.featured-thumb {
  position: relative;
  overflow: hidden;
  min-height: 300px;
  background: var(--surface-3);
}
.featured-thumb img.cover {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}
.featured:hover .featured-thumb img.cover {
  transform: scale(1.03);
}
.featured-thumb .pill {
  position: absolute;
  top: 16px;
  left: 16px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #fff;
  background: rgba(10, 14, 24, 0.42);
  border: 1px solid rgba(255, 255, 255, 0.28);
  padding: 0.4em 0.7em;
  border-radius: var(--r-xs);
  backdrop-filter: blur(4px);
}
.featured-flag {
  position: absolute;
  top: 16px;
  right: 16px;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  background: #fff;
  padding: 0.4em 0.7em;
  border-radius: var(--r-xs);
  box-shadow: var(--sh-sm);
}
.featured-body {
  padding: clamp(1.6rem, 3vw, 2.6rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.featured-body .post-meta {
  margin-bottom: 0.9rem;
}
.featured-body h2 {
  font-size: clamp(1.5rem, 2.4vw, 2.1rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin-bottom: 0.9rem;
  text-wrap: pretty;
}
.featured-body p {
  font-size: 1.02rem;
  color: var(--ink-2);
  line-height: 1.55;
  margin-bottom: 1.4rem;
}
.featured-body .post-foot {
  margin-top: 0;
}
@media (max-width: 800px) {
  .featured {
    grid-template-columns: 1fr;
  }
  .featured-thumb {
    min-height: 200px;
    aspect-ratio: 16/9;
  }
}

/* ---------- card grid ---------- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
@media (max-width: 900px) {
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 600px) {
  .blog-grid {
    grid-template-columns: 1fr;
  }
}

.post {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--sh-xs);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    border-color 0.2s ease;
}
.post:hover {
  transform: translateY(-4px);
  box-shadow: var(--sh-lg);
  border-color: var(--line-2);
}
.post-thumb {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--surface-3);
}
.post-thumb img.cover {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.35s ease;
}
.post:hover .post-thumb img.cover {
  transform: scale(1.04);
}
.post-thumb .grad {
  position: absolute;
  inset: 0;
}
.post-thumb .mesh {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.14) 1px, transparent 1px);
  background-size: 26px 26px;
  -webkit-mask-image: radial-gradient(
    120% 100% at 20% 0%,
    #000,
    transparent 75%
  );
  mask-image: radial-gradient(120% 100% at 20% 0%, #000, transparent 75%);
}
.post-thumb .glyph {
  position: absolute;
  right: 14px;
  bottom: 12px;
  color: rgba(255, 255, 255, 0.92);
}
.post-thumb .glyph svg {
  width: 40px;
  height: 40px;
}
.post-thumb .pill {
  position: absolute;
  top: 12px;
  left: 12px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #fff;
  background: rgba(10, 14, 24, 0.42);
  border: 1px solid rgba(255, 255, 255, 0.28);
  padding: 0.35em 0.65em;
  border-radius: var(--r-xs);
  backdrop-filter: blur(4px);
}
/* gradient variants */
.g-blue {
  background: linear-gradient(135deg, #2a6fdb, #1b3f8f);
}
.g-teal {
  background: linear-gradient(135deg, #1f8a8a, #0e5e6b);
}
.g-violet {
  background: linear-gradient(135deg, #6b4fd8, #3b2c8c);
}
.g-green {
  background: linear-gradient(135deg, #1f8a5b, #0e5e3c);
}
.g-slate {
  background: linear-gradient(135deg, #3d4350, #181b22);
}
.g-amber {
  background: linear-gradient(135deg, #c9802a, #8a4b1f);
}

.post-body {
  padding: 1.3rem 1.35rem 1.45rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.post-meta {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  margin-bottom: 0.7rem;
}
.post-meta .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--line-2);
}
.post h3 {
  font-size: 1.18rem;
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin-bottom: 0.55rem;
  text-wrap: pretty;
}
.post p {
  font-size: 0.92rem;
  color: var(--ink-2);
  line-height: 1.5;
  margin-bottom: 1.1rem;
}
.post-foot {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.post-read {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.post-read svg {
  width: 14px;
  height: 14px;
  transition: transform 0.18s ease;
}
.post:hover .post-read svg {
  transform: translateX(3px);
}
.post-author {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.8rem;
  color: var(--muted);
}
.post-author .av {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--surface-3);
  color: var(--ink-2);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.58rem;
  flex: none;
}

/* hide cards filtered out */
.post[hidden] {
  display: none;
}

/* ============================================================
   ARTICLE PAGE
   ============================================================ */
.article {
  padding-top: clamp(32px, 4vw, 56px);
}
.article-head {
  max-width: 760px;
  margin-inline: auto;
  text-align: center;
}
.article-head .crumb {
  justify-content: center;
}
.article-head h1 {
  font-size: clamp(2rem, 4vw, 3.1rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin: 1rem 0 1.1rem;
  text-wrap: balance;
}
.article-meta {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  flex-wrap: wrap;
  justify-content: center;
}
.article-meta .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--line-2);
}
.article-meta .author {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink-2);
  font-weight: 600;
}
.article-meta .av {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-ink);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.64rem;
}

.article-cover {
  max-width: 980px;
  margin: clamp(28px, 4vw, 48px) auto 0;
  aspect-ratio: 21 / 9;
  border-radius: var(--r-lg);
  position: relative;
  overflow: hidden;
  box-shadow: var(--sh-md);
  background: var(--surface-3);
}
.article-cover img.cover {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.article-cover .mesh {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.12) 1px, transparent 1px);
  background-size: 34px 34px;
  -webkit-mask-image: radial-gradient(
    120% 100% at 25% 0%,
    #000,
    transparent 78%
  );
  mask-image: radial-gradient(120% 100% at 25% 0%, #000, transparent 78%);
}
.article-cover .glyph {
  position: absolute;
  right: 28px;
  bottom: 22px;
  color: rgba(255, 255, 255, 0.9);
}
.article-cover .glyph svg {
  width: 64px;
  height: 64px;
}

/* article body */
.prose {
  max-width: 720px;
  margin: clamp(36px, 5vw, 60px) auto 0;
}
.prose > * + * {
  margin-top: 1.3rem;
}
.prose p {
  font-size: 1.12rem;
  line-height: 1.72;
  color: var(--ink-2);
}
.prose h2 {
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  letter-spacing: -0.02em;
  margin-top: 2.6rem;
  color: var(--ink);
}
.prose h3 {
  font-size: 1.3rem;
  letter-spacing: -0.015em;
  margin-top: 2rem;
  color: var(--ink);
}
.prose strong {
  color: var(--ink);
  font-weight: 700;
}
.prose a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--accent-line);
}
.prose a:hover {
  text-decoration-color: var(--accent);
}
.prose ul,
.prose ol {
  padding-left: 1.3rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.prose li {
  font-size: 1.08rem;
  line-height: 1.6;
  color: var(--ink-2);
  padding-left: 0.3rem;
}
.prose li::marker {
  color: var(--accent);
}
.prose blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.3rem 0 0.3rem 1.4rem;
  margin-left: 0;
  font-size: 1.3rem;
  line-height: 1.5;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.prose .callout {
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  border-radius: var(--r-md);
  padding: 1.3rem 1.4rem;
  display: flex;
  gap: 0.9rem;
  align-items: flex-start;
}
.prose .callout svg {
  width: 22px;
  height: 22px;
  color: var(--accent-ink);
  flex: none;
  margin-top: 2px;
}
.prose .callout p {
  font-size: 1rem;
  margin: 0;
  color: var(--ink-2);
}
.prose .callout strong {
  color: var(--accent-ink);
}
.prose figure {
  margin: 2rem 0;
}
.prose .stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 2rem 0;
}
.prose .stat-row .s {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 1.2rem;
  text-align: center;
}
.prose .stat-row .s b {
  display: block;
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--ink);
  line-height: 1;
}
.prose .stat-row .s span {
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 0.4rem;
  display: block;
}
.prose hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 2.6rem 0;
}
@media (max-width: 560px) {
  .prose .stat-row {
    grid-template-columns: 1fr;
  }
}

/* tags + share */
.article-foot {
  max-width: 720px;
  margin: 3rem auto 0;
  padding-top: 1.8rem;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.article-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* related / more posts */
.more-posts {
  border-top: 1px solid var(--line);
  margin-top: clamp(48px, 6vw, 80px);
}

/* author card */
.author-card {
  max-width: 720px;
  margin: 2.4rem auto 0;
  display: flex;
  gap: 1rem;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 1.4rem 1.5rem;
  box-shadow: var(--sh-xs);
}
.author-card .av {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-ink);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  flex: none;
}
.author-card b {
  font-size: 1rem;
}
.author-card span {
  font-size: 0.9rem;
  color: var(--muted);
  display: block;
  margin-top: 0.15rem;
}