/* linkchart — Use cases hub + article pages */

/* ── Article page reading experience ── */
.use-case-page {
  --uc-display: "Instrument Serif", "IBM Plex Sans", Georgia, serif;
  --uc-body: "IBM Plex Sans", system-ui, sans-serif;
  --uc-mono: "JetBrains Mono", ui-monospace, monospace;
  --uc-ink: #eef3f9;
  --uc-muted: #b4c0d0;
  --uc-faint: #738297;
  --uc-rule: rgba(148, 163, 184, 0.14);
  --uc-accent: #7dd3fc;
  --uc-surface: rgba(12, 17, 24, 0.58);
}

.use-case-page .landing-wrap {
  max-width: 1140px;
}

.use-case-page .about-breadcrumb {
  margin-bottom: 0.5rem;
}

.use-case-page .uc-hero {
  padding: 2.5rem 0 3.25rem;
  gap: 2.75rem;
}

@media (min-width: 900px) {
  .use-case-page .uc-hero {
    padding: 3.25rem 0 4.25rem;
    gap: 3.5rem;
    align-items: center;
  }
}

.use-case-page .uc-hero .landing-badge {
  margin-bottom: 1.15rem;
}

.use-case-page .uc-hero .landing-title {
  font-family: var(--uc-display);
  font-weight: 400;
  font-size: clamp(2.85rem, 6.2vw, 4.25rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
  margin-bottom: 1.15rem;
}

.use-case-page .uc-hero .landing-title-line,
.use-case-page .uc-hero .landing-title-accent {
  display: block;
}

.use-case-page .uc-hero .landing-title-accent {
  font-style: italic;
  font-weight: 400;
  color: var(--uc-accent);
  margin-top: 0.15em;
}

.use-case-page .uc-hero .landing-lead {
  max-width: 36rem;
  margin-bottom: 1.75rem;
  font-size: clamp(1.1rem, 2vw, 1.2rem);
  line-height: 1.72;
  color: var(--uc-muted);
}

.uc-hero-figure {
  margin: 0;
  border-radius: 1.2rem;
  overflow: hidden;
  border: 1px solid rgba(125, 211, 252, 0.22);
  background:
    radial-gradient(ellipse at 28% 18%, rgba(56, 189, 248, 0.16), transparent 55%),
    linear-gradient(160deg, #101826 0%, #0a0e14 100%);
  box-shadow:
    0 28px 70px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  position: relative;
}

.uc-hero-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 52%, rgba(10, 14, 20, 0.55));
  pointer-events: none;
}

.uc-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* Reading layout: TOC + article */
.uc-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: start;
  margin: 0 0 1.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--uc-rule);
}

@media (min-width: 1024px) {
  .uc-layout {
    grid-template-columns: 12.75rem minmax(0, 1fr);
    gap: 4rem;
    padding-top: 1.25rem;
  }
}

.use-case-page .uc-toc.product-toc {
  margin: 0;
  padding: 1.2rem 1.25rem;
  border-radius: 0.95rem;
  border: 1px solid var(--uc-rule);
  background: var(--uc-surface);
}

@media (min-width: 1024px) {
  .use-case-page .uc-toc.product-toc {
    position: sticky;
    top: 5.5rem;
    padding: 0.35rem 0 0;
    border: none;
    background: transparent;
    border-radius: 0;
  }
}

.use-case-page .uc-toc .product-toc-title,
.use-case-page .uc-toc-title {
  margin: 0 0 1rem;
  font-family: var(--uc-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--uc-faint);
}

.use-case-page .uc-toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
  columns: 1 !important;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.use-case-page .uc-toc li {
  margin: 0;
}

.use-case-page .uc-toc a {
  display: block;
  padding: 0.5rem 0.6rem;
  border-radius: 0.45rem;
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--uc-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}

.use-case-page .uc-toc a:hover {
  color: #f1f5f9;
  background: rgba(255, 255, 255, 0.035);
  border-left-color: rgba(125, 211, 252, 0.55);
}

/* Article column */
.use-case-page .uc-article.about-section,
.use-case-page .uc-article {
  max-width: none;
  padding: 0 !important;
  border-top: none !important;
  margin: 0;
}

.use-case-page .uc-article .about-prose,
.use-case-page .about-prose {
  max-width: 40.5rem;
  font-family: var(--uc-body);
  font-size: clamp(1.125rem, 1.6vw, 1.2rem);
  line-height: 1.88;
  color: var(--uc-muted);
  letter-spacing: -0.011em;
}

.use-case-page .uc-article .about-prose > p.uc-lead-prose {
  margin: 0 0 4.5rem !important;
  padding-bottom: 3.25rem;
  border-bottom: 1px solid var(--uc-rule);
  font-size: clamp(1.3rem, 2.4vw, 1.5rem);
  line-height: 1.78;
  color: var(--uc-ink);
  letter-spacing: -0.018em;
  font-weight: 400;
}

.use-case-page .uc-article .about-prose > h2,
.use-case-page .product-article.uc-article h2,
.use-case-page .uc-article h2 {
  margin: 5rem 0 1.5rem;
  padding-top: 3.25rem;
  border-top: 1px solid var(--uc-rule);
  font-family: var(--uc-display);
  font-size: clamp(2.05rem, 4vw, 2.75rem);
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: -0.032em;
  color: #f8fafc;
  scroll-margin-top: 5.75rem;
}

.use-case-page .uc-article .about-prose > h2:first-of-type,
.use-case-page .uc-article h2:first-of-type {
  margin-top: 0;
  padding-top: 0.35rem;
  border-top: none;
}

.use-case-page .uc-article .about-prose h3,
.use-case-page .uc-article h3 {
  margin: 3.5rem 0 1.1rem;
  font-family: var(--uc-display);
  font-size: clamp(1.35rem, 2.2vw, 1.55rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: #f1f5f9;
  scroll-margin-top: 5.75rem;
}

.use-case-page .uc-article .about-prose p {
  margin: 0 0 1.85rem;
}

.use-case-page .uc-article .about-prose strong {
  color: #f1f5f9;
  font-weight: 600;
}

.use-case-page .uc-article .about-prose a {
  color: #7dd3fc;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

.use-case-page .uc-article .about-prose a:hover {
  color: #bae6fd;
}

.use-case-page .uc-article .about-prose ul,
.use-case-page .uc-article .about-prose ol.uc-steps {
  margin: 0.5rem 0 2.5rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.9rem;
}

.use-case-page .uc-article .about-prose ul li,
.uc-steps li {
  position: relative;
  margin: 0;
  padding: 1.1rem 1.2rem 1.1rem 1.25rem;
  border-radius: 0.85rem;
  border: 1px solid var(--uc-rule);
  background: var(--uc-surface);
  color: var(--uc-ink);
  font-size: 1.0625rem;
  line-height: 1.68;
}

.uc-steps {
  counter-reset: uc-step;
}

.uc-steps li {
  counter-increment: uc-step;
  padding-left: 3.5rem;
}

.uc-steps li::before {
  content: counter(uc-step, decimal-leading-zero);
  position: absolute;
  left: 1.05rem;
  top: 1.2rem;
  font-family: var(--uc-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--uc-accent);
}

.use-case-page .uc-article .about-prose code {
  font-family: var(--uc-mono);
  font-size: 0.84em;
  padding: 0.2rem 0.5rem;
  border-radius: 0.35rem;
  color: #e0f2fe;
  background: rgba(14, 165, 233, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.22);
}

.use-case-page .uc-article .about-entities {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0.75rem 0 2.5rem;
}

.use-case-page .about-faq {
  margin-top: 1.5rem;
  display: grid;
  gap: 0.8rem;
}

.use-case-page .about-faq details {
  border-radius: 0.85rem;
  border: 1px solid var(--uc-rule);
  background: var(--uc-surface);
  padding: 0;
  overflow: hidden;
}

.use-case-page .about-faq summary {
  padding: 1.15rem 1.3rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: #f1f5f9;
  cursor: pointer;
  list-style: none;
}

.use-case-page .about-faq summary::-webkit-details-marker {
  display: none;
}

.use-case-page .about-faq-body {
  padding: 0 1.3rem 1.25rem;
}

.use-case-page .about-faq-body p {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--uc-muted);
}

.uc-related {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.uc-related li {
  margin: 0;
  padding: 0;
  border: none;
  background: transparent;
}

.uc-related a {
  display: block;
  padding: 1.05rem 1.2rem;
  border-radius: 0.85rem;
  border: 1px solid var(--uc-rule);
  background: var(--uc-surface);
  color: #bae6fd;
  text-decoration: none;
  font-size: 1.0625rem;
  line-height: 1.45;
  transition: border-color 0.15s, background 0.15s;
}

.uc-related a:hover {
  border-color: rgba(125, 211, 252, 0.4);
  background: rgba(14, 165, 233, 0.08);
  color: #e0f2fe;
}

.uc-closing {
  margin-top: 3.75rem;
  padding: 1.7rem 1.7rem;
  border-radius: 1rem;
  border: 1px solid rgba(125, 211, 252, 0.28);
  background:
    linear-gradient(145deg, rgba(14, 165, 233, 0.12), rgba(12, 17, 24, 0.92));
  color: var(--uc-ink);
  font-size: 1.15rem;
  line-height: 1.75;
}

.use-case-page .about-cta-band {
  margin-top: 4.25rem;
  padding: 2.85rem 1.85rem;
}

.use-case-page .about-cta-band h2 {
  font-family: var(--uc-display);
  font-weight: 400;
  font-size: clamp(1.85rem, 3.2vw, 2.35rem);
  letter-spacing: -0.025em;
}

@media (prefers-reduced-motion: no-preference) {
  .uc-hero-figure {
    animation: uc-rise 0.7s ease both;
  }
}

@keyframes uc-rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Hub ── */
.use-cases-hub .uc-hub-hero {
  padding-bottom: 1.5rem;
}

.uc-hub-hero .landing-title {
  max-width: 18ch;
}

.uc-filter-bar {
  margin: 0 0 1.5rem;
}

.uc-cat-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 0.75rem;
}

.uc-cat-nav a,
.uc-cat-btn {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.75rem;
  font: inherit;
  font-size: 0.75rem;
  font-weight: 500;
  color: #94a3b8;
  text-decoration: none;
  border-radius: 999px;
  border: 1px solid #1e2a3a;
  background: rgba(15, 20, 25, 0.7);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.uc-cat-nav a:hover,
.uc-cat-btn:hover {
  color: #e2e8f0;
  border-color: rgba(59, 130, 246, 0.45);
  background: rgba(59, 130, 246, 0.1);
}

.uc-cat-btn.is-active {
  color: #e2e8f0;
  border-color: rgba(59, 130, 246, 0.55);
  background: rgba(59, 130, 246, 0.16);
  box-shadow: 0 0 0 1px rgba(59, 130, 246, 0.2);
}

.uc-cat-btn:focus-visible {
  outline: 2px solid rgba(96, 165, 250, 0.7);
  outline-offset: 2px;
}

.uc-filter-status {
  margin: 0;
  font-size: 0.8125rem;
  color: #64748b;
}

.uc-filter-empty {
  margin: 0 0 3rem;
  padding: 1.5rem;
  text-align: center;
  color: #94a3b8;
  border: 1px dashed #1e2a3a;
  border-radius: 0.75rem;
}

.uc-card.is-filtered-out,
.uc-card[hidden] {
  display: none !important;
}

.uc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 3rem;
}

@media (min-width: 640px) {
  .uc-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .uc-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }
}

.uc-card {
  --uc-accent: #60a5fa;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  border-radius: 1rem;
  overflow: hidden;
  border: 1px solid #1e2a3a;
  background: rgba(15, 20, 25, 0.85);
  content-visibility: auto;
  contain-intrinsic-size: auto 320px;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.uc-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--uc-accent) 55%, #1e2a3a);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.4), 0 0 0 1px color-mix(in srgb, var(--uc-accent) 25%, transparent);
}

.uc-card picture,
.uc-hero-figure picture {
  display: block;
}

.uc-card img,
.uc-card picture img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #0a0e14;
  border-bottom: 1px solid #1e2a3a;
}

.uc-card-body {
  padding: 1rem 1.1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
}

.uc-card-cat {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--uc-accent);
}

.uc-card h2 {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 600;
  color: #f1f5f9;
  letter-spacing: -0.02em;
}

.uc-card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.5;
  color: #94a3b8;
}

@media (prefers-reduced-motion: no-preference) {
  .uc-card {
    animation: uc-rise 0.55s ease both;
  }
  .uc-card:nth-child(3n + 1) { animation-delay: 0.02s; }
  .uc-card:nth-child(3n + 2) { animation-delay: 0.06s; }
  .uc-card:nth-child(3n + 3) { animation-delay: 0.1s; }
}