.capabilities-section {
  --ivory: #0d1b2a;
  --navy: #f7f5ef;
  --navy-soft: rgba(247, 245, 239, .68);
  --navy-faint: rgba(247, 245, 239, .18);
  --cap-heading-color: #878c90;
  scroll-margin-top: 4.25rem;
  background: var(--ivory);
  color: var(--navy);
}

.capabilities-inner {
  width: var(--stage-width);
  margin-inline: auto;
  padding: clamp(5rem, 7vw, 7.5rem) var(--stage-inset) clamp(3rem, 4vw, 4rem);
}

.capabilities-opening {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
  margin-bottom: clamp(3.5rem, 4vw, 4.5rem);
}

.capabilities-opening__intro {
  max-width: 38ch;
  margin: 0;
  color: var(--navy-soft);
  font-size: clamp(1.25rem, 1.55vw, 1.625rem);
  font-weight: 400;
  line-height: 1.45;
}

.capabilities-eyebrow {
  margin: 0;
  color: var(--navy-soft);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .15em;
  line-height: 1.3;
  text-transform: uppercase;
}

.capabilities-layout {
  --cap-chapters-end-space: 0px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 3fr);
  gap: clamp(3rem, 5.5vw, 7rem);
}

.capabilities-rail,
.capabilities-chapters { min-width: 0; }

/* End the sticky rail at the final list border, before the closing whitespace. */
.capabilities-rail { margin-bottom: var(--cap-chapters-end-space); }

.capabilities-rail__sticky {
  position: sticky;
  top: max(5rem, calc(min(42vh, 420px) - 9.5rem));
}

.capabilities-rail__nest {
  container-type: inline-size;
  --sage: #8b9b7d;
  --sky: #8dbce2;
  --gold: #d4af37;
  width: min(100%, 19rem);
  color: var(--navy);
}

.capabilities-rail__nest.nest-orbit::before,
.capabilities-rail__nest.nest-orbit::after { content: none; }
.capabilities-rail__nest .nest-mark--large { width: 100%; }
.capabilities-rail__nest .nest-ring { border-width: 1.5px; }

.capabilities-rail__nest .nest-mark__rings {
  transition: none;
}

/* Expand the individual rings without interrupting their scroll-driven rotation. */
@media (hover: hover) and (pointer: fine) {
  .capabilities-rail__nest .nest-ring {
    transition: transform .72s cubic-bezier(.2, .72, .2, 1);
  }
  .capabilities-rail__nest:hover .nest-ring--navy { transform: rotate(8deg) scale(1.14, 1.28); }
  .capabilities-rail__nest:hover .nest-ring--sage { transform: rotate(52deg) scale(1.3, 1.1); }
  .capabilities-rail__nest:hover .nest-ring--gold { transform: rotate(94deg) scale(1.12, 1.32); }
  .capabilities-rail__nest:hover .nest-ring--sky { transform: rotate(132deg) scale(1.32, 1.14); }
}

@media (prefers-reduced-motion: reduce) {
  .capabilities-rail__nest .nest-ring { transition: none; }
}

.capabilities-rail__window {
  position: absolute;
  z-index: 4;
  top: 50%;
  left: 50%;
  width: 86%;
  height: 1.15em;
  overflow: hidden;
  transform: translate(-50%, -50%);
  /* Scale with the nest, not the viewport: even Commercial needs ring clearance. */
  font-size: min(12cqi, 2.4rem);
  font-weight: 300;
  text-transform: lowercase;
  letter-spacing: -.05em;
  line-height: 1.15;
  text-align: center;
}

.capabilities-rail__label {
  position: absolute;
  inset: 0;
  display: block;
  white-space: nowrap;
  transform: translateY(110%);
}

.capabilities-section.has-label-handoff .capabilities-rail__label {
  transition: transform .42s cubic-bezier(.22, 1, .36, 1);
}

.capabilities-rail__label[data-position="before"] { transform: translateY(-110%); }
.capabilities-rail__label[data-position="current"] { transform: translateY(0); }

.capabilities-chapters {
  container-type: inline-size;
  display: grid;
  gap: clamp(4rem, 6vw, 7rem);
  padding: clamp(5rem, 7vw, 8rem) 0 var(--cap-chapters-end-space);
}

.cap-chapter {
  min-width: 0;
  color: var(--navy);
  transition: color .5s ease;
}

.cap-chapter__heading {
  margin: 0 0 clamp(2.5rem, 4vw, 4rem);
  font-family: "Aptos Display", "Segoe UI Variable Display", "Aptos", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: min(clamp(7.35rem, 10.95vw, 14.4rem), 21cqi);
  color: var(--cap-heading-color);
  font-weight: 600;
  letter-spacing: -.065em;
  line-height: .95;
  text-align: right;
  text-transform: lowercase;
}

/* Quiet chapter headings: retain the original muted, hollow letterforms. */
@supports (-webkit-text-stroke: 1px currentColor) {
  .cap-chapter__heading {
    -webkit-text-stroke: 1.3px currentColor;
    -webkit-text-fill-color: transparent;
  }
}

.cap-chapter__intro {
  max-width: 28ch;
  margin: 0;
  font-size: clamp(2.3rem, 3.1vw, 3.1rem);
  font-weight: 400;
  letter-spacing: -.042em;
  line-height: 1.12;
  text-wrap: balance;
}

.cap-chapter__list {
  margin: clamp(3.5rem, 5vw, 5.5rem) 0 0;
  padding: 0;
  list-style: none;
}

.cap-chapter__list li {
  padding: 1.05rem 0 1.12rem;
  border-top: 1px solid var(--navy-faint);
  font-size: clamp(1.2rem, 1.55vw, 1.55rem);
  line-height: 1.3;
}

.cap-chapter__list li:last-child { border-bottom: 1px solid var(--navy-faint); }

/* Grouped content experiment; the original flat-list rules remain above. */
.capabilities-inner[data-capabilities-layout="grouped"] { max-width: 100%; }
.cap-chapter__groups {
  margin-top: clamp(3.5rem, 5vw, 5.5rem);
}
/* The heading's existing bottom margin supplies the compact layout's gap. */
[data-capabilities-layout="grouped"][data-grouped-intros="false"] .cap-chapter__groups {
  margin-top: 0;
}
.cap-chapter__group {
  padding: clamp(1.65rem, 2.4vw, 2.5rem) 0;
  border-top: 1px solid var(--navy-faint);
}
.cap-chapter__group:last-child {
  border-bottom: 1px solid var(--navy-faint);
}
.cap-chapter__group h4 {
  margin: 0 0 .65rem;
  font-family: inherit;
  font-size: clamp(1.5rem, 2vw, 1.95rem);
  font-weight: 500;
  letter-spacing: -.025em;
  line-height: 1.2;
}
.cap-chapter__group p {
  max-width: 57ch;
  margin: 0;
  color: var(--navy);
  font-size: clamp(1.125rem, 1.4vw, 1.35rem);
  font-weight: 400;
  line-height: 1.5;
}

.capabilities-section.is-emphasized .cap-chapter[data-active="false"] {
  color: color-mix(in srgb, var(--navy) 76%, var(--ivory));
}

@media (max-width: 900px) {
  .capabilities-opening { grid-template-columns: 1fr; gap: 1.5rem; margin-bottom: 3.5rem; }
  .capabilities-opening__intro { margin-top: 0; }
  .capabilities-layout { display: block; }
  .capabilities-rail { display: none; }
  .capabilities-chapters {
    gap: clamp(4.5rem, 8vw, 6rem);
    padding: 0;
  }

  .cap-chapter__heading {
    margin-bottom: clamp(1.8rem, 3vw, 2.5rem);
    font-size: min(clamp(4.8rem, 10.5vw, 6.75rem), 21cqi);
  }

  .cap-chapter__intro {
    max-width: 27ch;
    font-size: clamp(2rem, 4.4vw, 2.65rem);
  }

  .cap-chapter__list { margin-top: clamp(2.7rem, 5vw, 3.7rem); }
  .cap-chapter__list li { font-size: clamp(1.1rem, 2.3vw, 1.35rem); }
  .capabilities-section.is-emphasized .cap-chapter[data-active="false"] { color: var(--navy); }
}

@media (max-width: 620px) {
  .capabilities-section { scroll-margin-top: 3.9rem; }
  .capabilities-inner {
    padding: 4.6rem var(--page-pad) 3rem;
  }

  .capabilities-eyebrow { font-size: .7rem; }
  .capabilities-chapters { gap: 5rem; padding-bottom: 0; }
  .cap-chapter__heading { margin-bottom: 1.65rem; font-size: min(clamp(4.5rem, 15vw, 6rem), 21cqi); }
  .cap-chapter__intro { max-width: none; font-size: clamp(1.85rem, 7vw, 2.35rem); line-height: 1.16; }
  .cap-chapter__list { margin-top: 2.75rem; }
  .cap-chapter__list li { padding: .95rem 0 1.05rem; font-size: clamp(1.08rem, 4.5vw, 1.22rem); line-height: 1.34; }
}

@media (prefers-reduced-motion: reduce) {
  .cap-chapter,
  .capabilities-rail__label { transition: none; }
}

/* Mobile parity: compact persistent nest, retaining full-width phone copy. */
@media (max-width: 900px) {
  .capabilities-layout { display: grid; grid-template-columns: 112px minmax(0, 1fr); gap: 1.5rem; }
  .capabilities-rail { display: block; }
  .capabilities-rail__sticky { top: 6rem; }
  .capabilities-rail__nest { width: 112px; margin: 0; }
}
@media (max-width: 479px) {
  .capabilities-layout { display: block; }
  .capabilities-rail {
    position: sticky; top: 3.9rem; z-index: 5;
    background: var(--ivory); margin: 0 0 1.5rem; padding: .35rem 0;
  }
  .capabilities-rail__sticky { position: static; }
  .capabilities-rail__nest { width: 100px; margin: 0 0 0 auto; }
}