/* Article CMS styles — extends guides.css patterns for the unified /articles/ system.
   Reuses existing CSS variables from base.css. Answer box + enhanced CTA are new. */

/* Answer box — featured snippet target, always first element after header */
.answer-box {
  margin: var(--space-5) 0;
  padding: var(--space-4) var(--space-5);
  background: #F0FDFA;
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-gray-800);
}
.answer-box strong { color: var(--color-gray-900); }
.answer-box p:last-child { margin-bottom: 0; }

/* Inline tool link shortcode */
.tool-link {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--color-primary) 40%, transparent);
  text-underline-offset: 2px;
  transition: color var(--dur-fast) ease, text-decoration-color var(--dur-fast) ease;
}
.tool-link:hover {
  color: var(--color-primary-dark);
  text-decoration-color: var(--color-primary-dark);
}

/* Article body tables — semantic with caption */
.article table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-4) 0;
  font-size: var(--text-sm);
}
.article caption {
  text-align: left;
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  margin-bottom: var(--space-2);
}
.article th,
.article td {
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-gray-200);
  text-align: left;
}
.article th {
  background: var(--color-surface);
  font-weight: 600;
  color: var(--color-gray-900);
}
.article tr:nth-child(even) td { background: #F8FAFC; }

/* Articles index page */
.articles-main { margin-bottom: var(--space-10); }
.articles-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}
.articles-filter__btn {
  font-size: var(--text-sm);
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  border: 1px solid var(--color-gray-300);
  background: var(--color-surface);
  color: var(--color-gray-700);
  cursor: pointer;
  transition: all var(--dur-fast) ease;
}
.articles-filter__btn:hover,
.articles-filter__btn[aria-pressed="true"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

/* Article meta cluster badge */
.article__cluster {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-primary);
  margin-right: var(--space-2);
}

/* Responsive: stack CTA on narrow screens */
@media (max-width: 600px) {
  .article-cta { flex-direction: column; }
  .article-cta .btn-primary { align-self: stretch; text-align: center; }
}

/* ==========================================================================
   Articles hub (/articles/) — publication front page.
   Light hero with typographic punch. One dark featured card as focal point.
   ========================================================================== */

/* Hero — light, airy, with a subtle ambient accent on the right */
.site-hero--articles {
  position: relative;
  isolation: isolate;
  padding: var(--space-10) 0 var(--space-8);
  border-bottom: none;
  overflow: hidden;
}
.site-hero--articles::after {
  content: "";
  position: absolute;
  right: -5%;
  top: -20%;
  width: 45%;
  height: 140%;
  background: radial-gradient(ellipse at center, rgba(20, 184, 166, 0.07), transparent 70%);
  pointer-events: none;
  z-index: -1;
}
.articles-kicker {
  margin: 0 0 var(--space-3);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.site-hero--articles .site-hero__title {
  max-width: 14ch;
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.05;
  color: var(--color-gray-900);
}
.site-hero--articles .site-hero__sub {
  margin-top: var(--space-4);
  color: var(--color-gray-600);
  max-width: 52ch;
  font-size: var(--text-lg);
  line-height: 1.6;
}

/* Search — clean white input with shadow, sits below hero text */
.articles-search {
  margin-top: var(--space-6);
  max-width: 32rem;
}
.articles-search .site-filter {
  background: var(--color-surface);
  border: 1.5px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.2rem;
  font-size: var(--text-base);
  color: var(--color-gray-900);
  box-shadow: 0 2px 8px -2px rgba(0, 0, 0, 0.06);
  transition: border-color var(--dur-fast) ease, box-shadow var(--dur-fast) ease;
}
.articles-search .site-filter::placeholder { color: var(--color-gray-400); }
.articles-search .site-filter:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.1), 0 2px 8px -2px rgba(0, 0, 0, 0.06);
  outline: none;
}
.articles-search .site-filter-status {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-gray-500);
}

/* Featured lead — the ONE dark element. Creates dramatic contrast on the light page. */
.articles-featured {
  margin: var(--space-10) 0;
}
.featured-card {
  display: block;
  text-decoration: none;
  padding: 3rem 3.5rem 2.5rem;
  border: none;
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, #0c2422 0%, #134e4a 60%, #0f766e 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.3s ease;
}
.featured-card::before {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -80px;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(94, 234, 212, 0.12), transparent 70%);
  pointer-events: none;
}
.featured-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 60px -16px rgba(15, 118, 110, 0.35);
}
.featured-card__kicker {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #5eead4;
  background: rgba(94, 234, 212, 0.12);
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  margin-bottom: var(--space-4);
}
.featured-card__title {
  margin: 0 0 var(--space-4);
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: #fff;
  max-width: 22ch;
}
.featured-card__desc {
  margin: 0 0 var(--space-5);
  font-size: var(--text-base);
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.72);
  max-width: 52ch;
}
.featured-card__meta {
  display: block;
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: var(--space-4);
}
.featured-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-weight: 700;
  font-size: var(--text-sm);
  color: #0c2422;
  background: #5eead4;
  padding: 0.6rem 1.3rem;
  border-radius: var(--radius-md);
  transition: background var(--dur-fast) ease, transform var(--dur-fast) ease;
}
.featured-card:hover .featured-card__link {
  background: #99f6e4;
  transform: translateX(3px);
}
@media (max-width: 640px) {
  .featured-card { padding: 1.5rem 1.25rem; }
  .featured-card__title { max-width: 100%; }
}

/* Latest strip — horizontal scrollable row */
.articles-latest {
  margin-bottom: var(--space-12);
}
.articles-latest__heading {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-gray-900);
  margin: 0 0 var(--space-5);
}
.latest-strip {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(280px, 320px);
  gap: var(--space-4);
  overflow-x: auto;
  padding-bottom: var(--space-3);
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: var(--color-gray-300) transparent;
}
.latest-strip::-webkit-scrollbar { height: 4px; }
.latest-strip::-webkit-scrollbar-thumb { background: var(--color-gray-300); border-radius: 4px; }
.latest-strip .article-card { scroll-snap-align: start; }

/* Article cards — clean white with hover lift */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-5);
}
.article-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  text-decoration: none;
  padding: var(--space-5) var(--space-5) var(--space-4);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  transition: transform 0.2s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.2s ease, border-color 0.2s ease;
}
.article-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 12px 32px -10px rgba(15, 118, 110, 0.15), 0 2px 6px -2px rgba(0,0,0,0.04);
  transform: translateY(-3px);
}
.article-card__top {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem 0.6rem;
}
.article-card__badge {
  font-size: 0.6rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary-dark);
  background: #f0fdfa;
  border: 1px solid #ccfbf1;
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  white-space: nowrap;
}
.article-card__meta {
  font-size: 0.7rem;
  color: var(--color-gray-400);
  font-variant-numeric: tabular-nums;
}
.article-card__title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.35;
  color: var(--color-gray-900);
  transition: color var(--dur-fast) ease;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.article-card:hover .article-card__title { color: var(--color-primary-dark); }
.article-card__desc {
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-gray-500);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Cluster section headings — override site.css ::after with a single subtle accent */
.articles-main .silo { margin-bottom: var(--space-12); }
.articles-main .silo__head { margin-bottom: var(--space-6); }
.articles-main .silo__title {
  font-size: var(--text-xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-gray-900);
  padding-bottom: var(--space-3);
  border-bottom: none;
  display: block;
}
.articles-main .silo__title::after {
  width: 2rem;
  height: 2px;
  background: var(--color-primary);
  opacity: 0.5;
  margin-top: var(--space-2);
}

/* Cluster count chip */
.silo__count {
  display: inline-block;
  vertical-align: middle;
  margin-left: var(--space-2);
  font-size: 0.65rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  background: #ccfbf1;
  border-radius: 999px;
  padding: 0.15rem 0.55rem;
}