/* ─── PRODUCT HERO ─── */
.product-hero {
  padding: 140px 0 80px;
  border-bottom: 2px solid var(--ink);
}

.product-hero-inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.product-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
}

.product-hero-status {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 2px;
  border: 1px solid currentColor;
}

.product-hero-category {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

.product-hero h1 {
  font-family: var(--display);
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.product-hero-desc {
  font-size: 1.05rem;
  color: var(--ink-light);
  max-width: 580px;
  line-height: 1.75;
}

.product-hero-actions {
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
}

/* ─── ABOUT ─── */
.about {
  padding: 100px 0;
  border-bottom: 2px solid var(--ink);
}

.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
}

.about-text .section-body {
  max-width: none;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--rule-light);
  border: 1px solid var(--rule-light);
}

.about-stat {
  background: var(--paper);
  padding: 1.5rem;
}

.about-stat-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.5rem;
}

.about-stat-value {
  font-family: var(--display);
  font-weight: 900;
  font-size: 2rem;
  color: var(--ink);
  letter-spacing: -0.03em;
  line-height: 1;
}

.about-stat-sub {
  font-size: 0.8rem;
  color: var(--ink-faint);
  margin-top: 0.4rem;
}

/* ─── USE CASES ─── */
.use-cases {
  padding: 100px 0;
  border-bottom: 2px solid var(--ink);
}

.use-cases-header {
  margin-bottom: 4rem;
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--rule-light);
  border: 1px solid var(--rule-light);
}

.use-case-card {
  background: var(--paper);
  padding: 2rem;
  transition: background 0.2s var(--ease);
}

.use-case-card:hover { background: var(--paper-dark); }

.use-case-icon {
  width: 40px;
  height: 40px;
  border-radius: 2px;
  display: grid;
  place-items: center;
  margin-bottom: 1.25rem;
}

.use-case-icon .material-icons-outlined { font-size: 20px; }

.use-case-title {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--ink);
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.use-case-body {
  font-size: 0.85rem;
  color: var(--ink-light);
  line-height: 1.65;
}

/* ─── KEY CONCEPTS ─── */
.concepts {
  padding: 100px 0;
  border-bottom: 2px solid var(--ink);
}

.concepts-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: start;
}

/* ─── CTA BANNER ─── */
.cta-banner {
  padding: 80px 0;
  background: var(--ink);
  color: var(--paper);
}

.cta-banner-inner {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.cta-banner .section-label { color: var(--ink-ghost); }
.cta-banner .section-label::before { background: var(--ink-ghost); }

.cta-banner h2 {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--paper);
  margin-bottom: 1rem;
}

.cta-banner p {
  font-size: 0.95rem;
  color: var(--ink-ghost);
  line-height: 1.75;
  margin-bottom: 2rem;
}

/* ─── RELATED PRODUCTS ─── */
.related {
  padding: 100px 0;
  border-bottom: none;
}

.related-header { margin-bottom: 3rem; }

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--rule-light);
  border: 1px solid var(--rule-light);
}

.related-card {
  background: var(--paper);
  padding: 2rem;
  text-decoration: none;
  color: inherit;
  transition: background 0.2s var(--ease);
  display: flex;
  flex-direction: column;
  position: relative;
}

.related-card:hover { background: var(--paper-dark); }

.related-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  opacity: 0;
  transition: opacity 0.2s;
}

.related-card:hover::before { opacity: 1; }
.related-card[data-accent="green"]::before { background: var(--green); }
.related-card[data-accent="blue"]::before { background: var(--blue); }
.related-card[data-accent="amber"]::before { background: var(--amber); }

.related-card-status {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 2px;
  border: 1px solid currentColor;
  width: fit-content;
  margin-bottom: 1rem;
}

.related-card-name {
  font-family: var(--display);
  font-weight: 900;
  font-size: 1.25rem;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin-bottom: 0.3rem;
}

.related-card-tagline {
  font-size: 0.8rem;
  font-family: var(--mono);
  color: var(--ink-faint);
  letter-spacing: 0.03em;
  margin-bottom: 0.75rem;
}

.related-card-desc {
  font-size: 0.85rem;
  color: var(--ink-light);
  line-height: 1.65;
  flex: 1;
}

.related-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 1.25rem;
  transition: gap 0.2s var(--ease);
}

.related-card:hover .related-card-link { gap: 10px; }
.related-card-link .material-icons-outlined { font-size: 14px; }

/* ─── RESPONSIVE ─── */
@media (max-width: 900px) {
  .about-inner { grid-template-columns: 1fr; gap: 3rem; }
  .concepts-inner { grid-template-columns: 1fr; gap: 3rem; }
  .use-cases-grid { grid-template-columns: 1fr 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .product-hero { padding: 100px 0 60px; }
  .about { padding: 60px 0; }
  .use-cases { padding: 60px 0; }
  .concepts { padding: 60px 0; }
  .cta-banner { padding: 60px 0; }
  .related { padding: 60px 0; }
}

@media (max-width: 600px) {
  .product-hero h1 { font-size: 2.4rem; }
  .product-hero { padding: 80px 0 40px; }
  .about { padding: 48px 0; }
  .use-cases { padding: 48px 0; }
  .concepts { padding: 48px 0; }
  .cta-banner { padding: 48px 0; }
  .related { padding: 48px 0; }
  .use-cases-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr; }
  .product-hero-actions { flex-direction: column; }
  .product-hero-actions .btn-primary,
  .product-hero-actions .btn-ghost { width: 100%; justify-content: center; }
  .use-cases-header { margin-bottom: 2rem; }
}