/* ── Architecture section (dark) ── */
.architecture-section {
  padding: var(--space-7) max(var(--space-4), calc((100vw - var(--content-width)) / 2));
  background: var(--color-ink);
  color: var(--color-paper);
}

.section-heading-light {
  width: 100%;
}

.section-heading-light .eyebrow {
  color: var(--color-accent);
}

.architecture-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid color-mix(in oklch, var(--color-paper) 24%, transparent);
}

.architecture-grid article {
  min-height: 17rem;
  padding: var(--space-5) var(--space-4);
  border-right: 1px solid color-mix(in oklch, var(--color-paper) 24%, transparent);
}

.architecture-grid article:nth-child(3n) {
  border-right: 0;
}

.architecture-grid article:nth-child(-n + 3) {
  border-bottom: 1px solid color-mix(in oklch, var(--color-paper) 24%, transparent);
}

.architecture-number {
  display: block;
  margin-bottom: var(--space-7);
  color: var(--color-accent);
  font-family: var(--font-display);
  font-style: italic;
}

.architecture-grid h3 {
  margin: 0;
  font-size: 1.15rem;
}

.architecture-grid p {
  color: color-mix(in oklch, var(--color-paper) 72%, transparent);
  font-size: 0.9rem;
}

/* ── Closing section ── */
.closing-section {
  text-align: center;
}

.closing-section .eyebrow {
  color: var(--color-cafeteria-label);
}

.closing-section h2 {
  max-width: 14ch;
  margin-inline: auto;
}

.closing-section p:not(.eyebrow) {
  max-width: 38rem;
  margin: var(--space-4) auto var(--space-5);
  color: var(--color-ink-soft);
}

/* ── Footer ── */
footer {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-4);
  width: min(calc(100% - 3rem), var(--content-width));
  min-height: 7rem;
  margin-inline: auto;
  border-top: 1px solid var(--color-line);
  color: var(--color-ink-soft);
  font-size: 0.82rem;
}

footer p {
  text-align: center;
}

.brand-footer {
  color: var(--color-ink);
}

/* ── Tablet breakpoint ── */
@media (max-width: 62rem) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  nav {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: 48rem;
  }

  .hero-screenshots {
    width: min(100%, 38rem);
    margin-inline: auto;
  }

  .architecture-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .architecture-grid article:nth-child(3n) {
    border-right: 1px solid color-mix(in oklch, var(--color-paper) 24%, transparent);
  }

  .architecture-grid article:nth-child(2n) {
    border-right: 0;
  }

  .architecture-grid article:nth-child(-n + 4) {
    border-bottom: 1px solid color-mix(in oklch, var(--color-paper) 24%, transparent);
  }

  .integrations-grid {
    grid-template-columns: 1fr;
  }

  .agentic-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ── Mobile breakpoint ── */
@media (max-width: 44rem) {
  .site-header,
  .hero,
  .agentic-section,
  .profile-section,
  .signage-section,
  .screens-section,
  .integrations-section,
  .closing-section,
  footer {
    width: min(calc(100% - 2rem), var(--content-width));
  }

  .agentic-grid {
    grid-template-columns: 1fr;
  }

  .agentic-flow {
    gap: var(--space-1);
    padding: var(--space-3);
  }

  .flow-step {
    font-size: 0.8rem;
    padding: var(--space-1) var(--space-2);
  }

  .flow-arrow {
    font-size: 0.9rem;
  }

  .header-link {
    display: inline-flex;
    align-items: center;
  }

  .hero {
    min-height: auto;
    padding-block: var(--space-6);
  }

  h1 {
    font-size: clamp(2.75rem, 16vw, 4.6rem);
  }

  .hero-screenshots {
    min-height: auto;
  }

  .hero-shot-desktop {
    transform: none;
  }

  .hero-shot-mobile {
    position: static;
    width: min(50%, 14rem);
    margin-top: var(--space-3);
    transform: none;
  }

  .section-heading,
  .profile-grid,
  .screens-grid,
  .signage-section {
    grid-template-columns: 1fr;
  }

  .profile-card {
    min-height: auto;
  }

  .signage-copy {
    position: static;
  }

  .route-list div {
    grid-template-columns: 1fr auto;
    padding-block: var(--space-3);
  }

  .route-list code {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .architecture-section {
    padding-block: var(--space-6);
  }

  .architecture-grid {
    grid-template-columns: 1fr;
  }

  .architecture-grid article,
  .architecture-grid article:nth-child(2n),
  .architecture-grid article:nth-child(3n) {
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid color-mix(in oklch, var(--color-paper) 24%, transparent);
  }

  .architecture-grid article:last-child {
    border-bottom: 0;
  }

  .architecture-number {
    margin-bottom: var(--space-5);
  }

  footer {
    grid-template-columns: 1fr;
    padding-block: var(--space-4);
    text-align: center;
  }

  footer .brand,
  .footer-links {
    justify-self: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  footer p {
    margin: 0;
  }
}

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .button,
  .screen-frame {
    transition-duration: 0.01ms;
  }

  .button:hover,
  .screen-frame:hover {
    transform: none;
  }
}