/* —— Sticky nav —— */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  border-bottom: 1px solid transparent;
  background: rgba(245, 245, 244, 0.9);
  backdrop-filter: blur(10px);
  transition: border-color 200ms var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(255, 255, 255, 0.94);
}

.site-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.04em;
  color: var(--ink);
  text-decoration: none;
}

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

.brand__mark {
  color: var(--accent);
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.35rem 1.75rem;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 0.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__links a {
  display: inline-flex;
  padding: 0.45rem 0.55rem;
  color: var(--muted);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.88rem;
  letter-spacing: 0.01em;
}

.nav__links a:hover,
.nav__links a[aria-current="true"] {
  color: var(--ink);
}

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  cursor: pointer;
  padding: 0;
  align-items: center;
  justify-content: center;
}

.nav-toggle__bars {
  display: block;
  width: 1.1rem;
  height: 1.5px;
  background: var(--ink);
  position: relative;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: var(--ink);
}

.nav-toggle__bars::before {
  top: -5px;
}

.nav-toggle__bars::after {
  top: 5px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  top: 0;
  transform: rotate(-45deg);
}

/* —— Sparse score signal —— */
.score-signal {
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  padding: clamp(1.75rem, 4vw, 2.5rem);
}

.score-signal__label {
  margin: 0 0 1.75rem;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-soft);
}

.score-signal__main {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1.5rem;
}

.score-signal__value {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(4.5rem, 10vw, 6rem);
  line-height: 0.9;
  letter-spacing: -0.06em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.score-signal__denom {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--muted-soft);
  letter-spacing: -0.02em;
}

.score-signal__meta {
  margin: 0 0 0 0.5rem;
  align-self: center;
  max-width: 14rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.score-dims {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.score-dims li {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  align-items: baseline;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-display);
}

.score-dims li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.score-dims__name {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.score-dims__val {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.score-dims__val.is-low {
  color: var(--score-warn);
}

.score-signal__cta {
  margin-top: 1.75rem;
}

/* —— Assembly motif (AI sees your business) —— */
.assembly {
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  padding: clamp(1.5rem, 3.5vw, 2.25rem);
}

.assembly__business {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.35rem;
  border-bottom: 1px solid var(--line);
}

.assembly__kicker {
  margin: 0;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-soft);
}

.assembly__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--ink);
}

.assembly__flow {
  display: grid;
  gap: 0;
  position: relative;
}

.assembly__row {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 1rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
  opacity: 0;
  transform: translateY(10px);
  transition:
    opacity 550ms var(--ease),
    transform 550ms var(--ease);
}

.assembly.is-visible .assembly__row {
  opacity: 1;
  transform: none;
}

.assembly.is-visible .assembly__row:nth-child(1) {
  transition-delay: 80ms;
}
.assembly.is-visible .assembly__row:nth-child(2) {
  transition-delay: 160ms;
}
.assembly.is-visible .assembly__row:nth-child(3) {
  transition-delay: 240ms;
}
.assembly.is-visible .assembly__row:nth-child(4) {
  transition-delay: 320ms;
}

.assembly__key {
  margin: 0;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  padding-top: 0.2rem;
}

.assembly__vals {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.assembly__chip {
  display: inline-flex;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line-strong);
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink-soft);
  background: var(--bg);
}

/* —— Product system progression —— */
.system-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.system-item {
  display: grid;
  grid-template-columns: 5.5rem 1fr auto;
  gap: clamp(1rem, 3vw, 2rem);
  align-items: start;
  padding: clamp(1.5rem, 3vw, 2rem) 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: background 180ms var(--ease);
}

.system-item:hover {
  background: rgba(255, 255, 255, 0.55);
}

.system-item__num {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  color: var(--ink);
  line-height: 1;
}

.system-item h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2vw, 1.45rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.system-item p {
  margin: 0;
  max-width: 38rem;
  color: var(--muted);
  font-size: 1.02rem;
}

.system-item__cta {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
  padding-top: 0.35rem;
  text-decoration: none;
}

.system-item__cta[aria-disabled="true"] {
  color: var(--muted-soft);
  pointer-events: none;
}

.system-item--link:hover .system-item__cta {
  color: var(--accent-hover);
}

/* —— Dual / layer editorial —— */
.dual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--line);
}

.dual__pane {
  padding: clamp(1.5rem, 3.5vw, 2.25rem);
  background: var(--bg-elevated);
}

.dual__pane + .dual__pane {
  border-left: 1px solid var(--line);
}

.dual__pane h3 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-soft);
}

.dual__pane p {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
}

.dual__pane--ai {
  background: var(--ink);
}

.dual__pane--ai h3 {
  color: rgba(255, 255, 255, 0.45);
}

.dual__pane--ai p {
  color: rgba(255, 255, 255, 0.78);
}

.dual__pane .dual__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.dual__pane--ai .dual__title {
  color: #fff;
}

/* —— Layer triad —— */
.layer-triad {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: clamp(1rem, 3vw, 2rem);
  align-items: center;
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  padding: clamp(1.75rem, 4vw, 2.75rem);
}

.layer-triad__side {
  display: grid;
  gap: 0.85rem;
}

.layer-triad__label {
  margin: 0;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-soft);
}

.layer-triad__node {
  padding: 1rem 1.15rem;
  border: 1px solid var(--line);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  background: var(--bg);
}

.layer-triad__node--accent {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

.layer-triad__center {
  display: grid;
  place-items: center;
  text-align: center;
  min-width: 7rem;
}

.layer-triad__hub {
  width: 7.5rem;
  height: 7.5rem;
  border: 1px solid var(--ink);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  position: relative;
}

.layer-triad__hub::before,
.layer-triad__hub::after {
  content: "";
  position: absolute;
  top: 50%;
  width: clamp(1.25rem, 4vw, 2.5rem);
  height: 1px;
  background: var(--line-strong);
}

.layer-triad__hub::before {
  right: 100%;
  margin-right: 0.5rem;
}

.layer-triad__hub::after {
  left: 100%;
  margin-left: 0.5rem;
}

/* —— Path steps (agentic) —— */
.path-rail {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.path-rail__step {
  padding: 1.5rem 1.25rem 0 0;
  position: relative;
}

.path-rail__step::before {
  content: "";
  display: block;
  width: 100%;
  height: 1px;
  background: rgba(255, 255, 255, 0.2);
  margin-bottom: 1.25rem;
  transform-origin: left center;
  transform: scaleX(0);
  transition: transform 800ms var(--ease);
}

.path-rail.is-visible .path-rail__step::before {
  transform: scaleX(1);
}

.path-rail.is-visible .path-rail__step:nth-child(2)::before {
  transition-delay: 120ms;
}
.path-rail.is-visible .path-rail__step:nth-child(3)::before {
  transition-delay: 240ms;
}
.path-rail.is-visible .path-rail__step:nth-child(4)::before {
  transition-delay: 360ms;
}

.path-rail__num {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.4);
}

.path-rail__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: #fff;
}

/* —— Why cards —— */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

.why-card {
  padding: 1.75rem 1.5rem 1.75rem 0;
  border-bottom: 1px solid var(--line);
}

.why-card + .why-card {
  padding-left: 1.5rem;
  border-left: 1px solid var(--line);
}

.why-card h3 {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.why-card p {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
}

/* —— Footer —— */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-elevated);
  padding: 3rem 0 2rem;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(2, 1fr);
  gap: 2rem 1.5rem;
  margin-bottom: 2.25rem;
}

.site-footer__brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.04em;
  color: var(--ink);
  text-decoration: none;
}

.site-footer__tag {
  margin: 0.7rem 0 0;
  color: var(--muted);
  font-size: 0.98rem;
  max-width: 22rem;
}

.site-footer h2 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-soft);
}

.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.site-footer a {
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 500;
}

.site-footer a:hover {
  color: var(--accent);
}

.site-footer__bottom {
  padding-top: 1.35rem;
  border-top: 1px solid var(--line);
  color: var(--muted-soft);
  font-size: 0.9rem;
}

/* —— Legal pages —— */
.legal {
  padding: calc(var(--nav-h) + 2.5rem) 0 4rem;
}

.legal h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  letter-spacing: -0.04em;
  color: var(--ink);
}

.legal .updated {
  margin: 0 0 2rem;
  color: var(--muted-soft);
  font-size: 0.95rem;
}

.legal h2 {
  margin: 2rem 0 0.65rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--ink);
}

.legal p,
.legal li {
  color: var(--muted);
  max-width: 42rem;
}

.legal ul {
  padding-left: 1.2rem;
}

@media (max-width: 960px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
  }

  .system-item {
    grid-template-columns: 4rem 1fr;
  }

  .system-item__cta {
    grid-column: 2;
  }

  .path-rail {
    grid-template-columns: 1fr 1fr;
  }

  .layer-triad {
    grid-template-columns: 1fr;
  }

  .layer-triad__hub::before,
  .layer-triad__hub::after {
    display: none;
  }

  .layer-triad__center {
    order: -1;
    justify-self: start;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    padding: 1rem var(--gutter) 1.25rem;
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
  }

  .nav.is-open {
    display: flex;
  }

  .nav__links {
    flex-direction: column;
    align-items: stretch;
  }

  .nav__links a {
    padding: 0.75rem 0.25rem;
  }

  .nav .btn {
    width: 100%;
  }

  .dual,
  .why-grid,
  .site-footer__grid,
  .path-rail {
    grid-template-columns: 1fr;
  }

  .dual__pane + .dual__pane {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .why-card + .why-card {
    padding-left: 0;
    border-left: 0;
  }

  .assembly__row {
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }

  .score-signal__main {
    flex-wrap: wrap;
  }

  .score-signal__meta {
    margin: 0.75rem 0 0;
    flex-basis: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .assembly__row,
  .path-rail__step::before {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn--primary:hover {
    transform: none;
  }
}