/* ==========================================================================
   Expertise pages (expertise/*.html, generated by scripts/build_expertise.py)
   Same tokens, type and motifs as the rest of the site: ink/paper/navy
   bands, slab lines with references, serif headings with italic accents.
   Reveal states come from js/expertise.js.
   ========================================================================== */

:root {
  --paper: #f3f5f8;
  --paper-ink: #0e1b2e;
  --paper-muted: #56657a;
  --paper-line: rgba(15, 42, 77, 0.14);
  --gold: #e9d7a8;
  --inner-x: calc(var(--gutter) + clamp(0rem, 4vw, 5rem));
}

body.page-expertise { background: var(--paper); }

/* Shared bits ----------------------------------------------------------- */
.xp-eyebrow {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 0 0 1.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--paper-muted);
}
.xp-eyebrow--light { color: var(--silver-dim); }
.xp-eyebrow__rule { width: 48px; height: 1px; background: currentColor; }

.xp-link {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--navy);
}
.xp-link--light { color: var(--white); }
.xp-link span {
  padding-bottom: 4px;
  background: linear-gradient(currentColor, currentColor) left bottom / 0% 1px no-repeat;
  transition: background-size 0.6s var(--ease-out);
}
.xp-link svg { transition: transform 0.6s var(--ease-out); }
.xp-link:hover span,
.xp-link:focus-visible span { background-size: 100% 1px; }
.xp-link:hover svg,
.xp-link:focus-visible svg { transform: translateX(8px); }

[data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
  transition-delay: calc(var(--i, 0) * 0.08s);
}
[data-reveal].is-in { opacity: 1; transform: none; }

/* Hero ------------------------------------------------------------------ */
.xp-hero {
  position: relative;
  display: grid;
  align-items: end;
  min-height: min(92vh, 860px);
  min-height: min(92svh, 860px);
  overflow: hidden;
  background: var(--ink);
  color: var(--white);
}
.xp-hero--hub { min-height: min(78vh, 720px); }
.xp-hero__image {
  position: absolute;
  inset: 0 0 0 30%;
  background-size: cover;
  background-repeat: no-repeat;
  filter: grayscale(1) contrast(1.05) brightness(0.85);
  opacity: 0.6;
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, #000 45%);
  mask-image: linear-gradient(90deg, transparent 0%, #000 45%);
  transform: scale(1.08);
  transition: transform 2.6s var(--ease-out);
}
.is-ready .xp-hero__image { transform: none; }
.xp-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(10, 18, 32, 0.7) 0%, rgba(10, 18, 32, 0) 30%, rgba(10, 18, 32, 0.55) 100%),
    linear-gradient(90deg, rgba(25, 67, 118, 0.35), rgba(25, 67, 118, 0) 60%);
  pointer-events: none;
}
.xp-hero__inner {
  position: relative;
  z-index: 1;
  padding: calc(160px + 2.5rem) var(--inner-x) clamp(3.5rem, 8vh, 6rem);
}
.xp-hero__title {
  max-width: 15ch;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.75rem, 6.6vw, 6.75rem);
  line-height: 1;
  letter-spacing: -0.025em;
  text-wrap: balance;
}
.xp-hero__title em { font-style: italic; font-weight: 500; color: var(--gold); }
.xp-hero__lead {
  max-width: 54ch;
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  font-size: clamp(1rem, 1.3vw, 1.175rem);
  line-height: 1.7;
  color: var(--silver);
}
.xp-hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem 2.25rem;
  margin-top: clamp(2rem, 4vw, 2.75rem);
}
.xp-hero__lead,
.xp-hero__actions,
.xp-hero .xp-eyebrow,
.xp-crumbs {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
}
.is-ready .xp-crumbs,
.is-ready .xp-hero .xp-eyebrow { opacity: 1; transform: none; transition-delay: 0.15s; }
.is-ready .xp-hero__lead { opacity: 1; transform: none; transition-delay: 0.7s; }
.is-ready .xp-hero__actions { opacity: 1; transform: none; transition-delay: 0.85s; }

/* Breadcrumb */
.xp-crumbs { margin-bottom: 2rem; }
.xp-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--silver-dim);
}
.xp-crumbs li + li::before { content: "/"; margin: 0 0.6rem; opacity: 0.5; }
.xp-crumbs a { transition: color 0.3s ease; }
.xp-crumbs a:hover,
.xp-crumbs a:focus-visible { color: var(--white); text-decoration: underline; text-underline-offset: 3px; }
.xp-crumbs [aria-current] { color: var(--white); }

/* Sections -------------------------------------------------------------- */
.xp-section { position: relative; padding-block: 0 clamp(4.5rem, 9vw, 7.5rem); }
.xp-section--paper { background: var(--paper); color: var(--paper-ink); --muted: var(--paper-muted); --rule: var(--paper-line); --accent: var(--navy); }
.xp-section--white { background: var(--white); color: var(--paper-ink); --muted: var(--paper-muted); --rule: var(--paper-line); --accent: var(--navy); padding-top: clamp(4rem, 8vw, 6rem); }
.xp-section--dark { background: linear-gradient(180deg, var(--ink) 0%, #0c1830 100%); color: var(--white); --muted: var(--silver-dim); --rule: var(--line); --accent: var(--silver); }
.xp-section--navy { background: var(--navy); color: var(--white); --muted: rgba(255, 255, 255, 0.72); --rule: rgba(255, 255, 255, 0.2); --accent: var(--gold); }
.xp-inner { padding-inline: var(--inner-x); }

.xp-slab {
  position: relative;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: clamp(3rem, 6vw, 4.5rem);
  padding: 1.1rem var(--inner-x) 0;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}
.xp-slab span:last-child { color: var(--accent); text-align: right; }
.xp-slab::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 6px;
  background:
    linear-gradient(var(--accent), var(--accent)) top / 100% 1px no-repeat,
    repeating-linear-gradient(-45deg, var(--rule) 0 1px, transparent 1px 6px);
}

.xp-h2 {
  max-width: 18ch;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.2rem, 4.6vw, 4.5rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
.xp-h2 em { font-style: italic; font-weight: 500; color: var(--accent); }
.xp-section--dark .xp-h2 em { color: var(--silver); }

/* Overview */
.xp-overview {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: clamp(2.5rem, 6vw, 7rem);
  align-items: start;
}
.xp-overview__copy > p {
  max-width: 60ch;
  margin: 0 0 1.25rem;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--paper-muted);
}
.xp-overview__copy > p:first-child {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 1.7vw, 1.55rem);
  line-height: 1.45;
  color: var(--paper-ink);
}
.xp-values { display: grid; gap: 0; margin: 2.25rem 0 0; padding: 0; list-style: none; border-top: 1px solid var(--paper-line); }
.xp-value {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 1rem 2rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--paper-line);
}
.xp-value h3 { margin: 0; font-family: var(--font-display); font-size: 1.2rem; font-weight: 600; color: var(--navy); }
.xp-value p { margin: 0; color: var(--paper-muted); line-height: 1.6; }

@media (min-width: 1024px) {
  .xp-overview > .xp-h2,
  .xp-faqs > .xp-h2 { position: sticky; top: calc(100px + 2.5rem); }
}

/* Capabilities */
.xp-caps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(2.5rem, 5vw, 3.5rem) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}
.xp-cap {
  padding: clamp(1.5rem, 2.5vw, 2.25rem);
  background: #0c1830;
  transition: background-color 0.4s ease;
}
.xp-cap:hover { background: #12233f; }
.xp-cap__ref {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.xp-cap h3 { margin: 1.5rem 0 0.75rem; font-family: var(--font-display); font-size: clamp(1.3rem, 1.8vw, 1.6rem); font-weight: 600; line-height: 1.2; }
.xp-cap p { margin: 0; font-size: 0.9375rem; line-height: 1.65; color: var(--silver-dim); }

.xp-scope {
  display: grid;
  grid-template-columns: minmax(0, 0.6fr) minmax(0, 2fr);
  gap: 1.5rem 3rem;
  margin-top: clamp(3rem, 6vw, 4.5rem);
  padding-top: 2rem;
  border-top: 2px solid var(--silver);
}
.xp-scope__title { margin: 0; font-family: var(--font-display); font-size: 1.6rem; font-weight: 600; }
.xp-scope__list {
  columns: 2;
  column-gap: 3rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.xp-scope__list li {
  display: flex;
  gap: 0.85rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--line);
  break-inside: avoid;
  color: var(--silver);
  font-size: 0.9375rem;
}
.xp-scope__list li::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  margin-top: 0.5rem;
  border: 1px solid var(--gold);
  transform: rotate(45deg);
}

/* Methodology timeline */
.xp-steps {
  --done: 0;
  position: relative;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 1.5rem;
  margin: clamp(2.5rem, 5vw, 3.5rem) 0 0;
  padding: 2.75rem 0 0;
  list-style: none;
}
.xp-steps::before,
.xp-steps::after {
  content: "";
  position: absolute;
  top: 0.55rem;
  left: 0;
  right: 0;
  height: 2px;
}
.xp-steps::before { background: var(--paper-line); }
.xp-steps::after { background: var(--navy); transform-origin: left; transform: scaleX(var(--done)); transition: transform 0.2s linear; }
.xp-step { position: relative; }
.xp-step::before {
  content: "";
  position: absolute;
  top: -2.55rem;
  left: 0;
  width: 14px;
  height: 14px;
  border: 2px solid var(--paper-line);
  border-radius: 50%;
  background: var(--paper);
  transition: border-color 0.4s ease, background-color 0.4s ease;
}
.xp-step.is-on::before { border-color: var(--navy); background: var(--navy); box-shadow: 0 0 0 5px rgba(25, 67, 118, 0.12); }
.xp-step__num {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--paper-muted);
  font-variant-numeric: tabular-nums;
}
.xp-step h3 { margin: 0.6rem 0 0.6rem; font-family: var(--font-display); font-size: 1.45rem; font-weight: 600; }
.xp-step p { margin: 0; font-size: 0.9375rem; line-height: 1.6; color: var(--paper-muted); }
.xp-step { opacity: 0.35; transition: opacity 0.5s ease; }
.xp-step.is-on { opacity: 1; }

/* Applications */
.xp-apps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 1.75rem);
  margin: clamp(2.5rem, 5vw, 3.5rem) 0 0;
  padding: 0;
  list-style: none;
}
.xp-app {
  padding: 1.75rem 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
  transition: background-color 0.4s ease, border-color 0.4s ease, transform 0.6s var(--ease-out);
}
.xp-app:hover { background: rgba(255, 255, 255, 0.09); border-color: var(--gold); transform: translateY(-4px); }
.xp-app h3 { margin: 0 0 0.6rem; font-family: var(--font-display); font-size: 1.35rem; font-weight: 600; }
.xp-app p { margin: 0; font-size: 0.9375rem; line-height: 1.6; color: rgba(255, 255, 255, 0.75); }

/* Quality / safety / coordination */
.xp-qsc {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.5rem, 3vw, 3rem);
  margin: clamp(2.5rem, 5vw, 3.5rem) 0 0;
  padding: 0;
  list-style: none;
}
.xp-qsc li { padding-top: 1.5rem; border-top: 2px solid var(--navy); }
.xp-qsc__code {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 6vw, 5rem);
  font-weight: 600;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--navy);
}
.xp-qsc h3 { margin: 1rem 0 0.6rem; font-family: var(--font-display); font-size: 1.5rem; font-weight: 600; }
.xp-qsc p { margin: 0; line-height: 1.65; color: var(--paper-muted); }

/* Related expertise */
.xp-related__head { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 1.5rem; }
.xp-related {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 1.5rem);
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  padding: 0;
  list-style: none;
}
.xp-related__card {
  display: grid;
  gap: 0.6rem;
  height: 100%;
  padding: 1.75rem;
  border: 1px solid var(--paper-line);
  border-radius: 12px;
  background: var(--paper);
  transition: border-color 0.3s ease, background-color 0.3s ease, transform 0.5s var(--ease-out);
}
.xp-related__num { font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.16em; color: var(--paper-muted); }
.xp-related__name { font-family: var(--font-display); font-size: 1.4rem; font-weight: 600; color: var(--paper-ink); }
.xp-related__desc { font-size: 0.9375rem; line-height: 1.55; color: var(--paper-muted); }
.xp-related__go { margin-top: 0.5rem; color: var(--navy); transition: transform 0.5s var(--ease-out); }
.xp-related__card:hover,
.xp-related__card:focus-visible { border-color: var(--navy); background: var(--white); transform: translateY(-3px); }
.xp-related__card:hover .xp-related__go { transform: translateX(8px); }

/* FAQs */
.xp-faqs { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.4fr); gap: clamp(2rem, 5vw, 5rem); align-items: start; }
.xp-faqs__list { border-top: 1px solid var(--paper-line); }
.xp-faq { border-bottom: 1px solid var(--paper-line); }
.xp-faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.35rem 0;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 1.5vw, 1.3rem);
  font-weight: 600;
  line-height: 1.35;
  color: var(--paper-ink);
  cursor: pointer;
  list-style: none;
}
.xp-faq summary::-webkit-details-marker { display: none; }
.xp-faq summary:hover { color: var(--navy); }
.xp-faq summary:focus-visible { outline: 2px solid var(--navy); outline-offset: 4px; }
.xp-faq__icon { position: relative; flex: none; width: 14px; height: 14px; color: var(--navy); }
.xp-faq__icon::before,
.xp-faq__icon::after { content: ""; position: absolute; left: 0; top: 50%; width: 100%; height: 1.5px; margin-top: -0.75px; background: currentColor; transition: transform 0.4s var(--ease-out); }
.xp-faq__icon::after { transform: rotate(90deg); }
.xp-faq[open] .xp-faq__icon::after { transform: rotate(0); }
.xp-faq__answer p { max-width: 62ch; margin: 0; padding: 0 2.5rem 1.5rem 0; line-height: 1.7; color: var(--paper-muted); }
.xp-faq[open] .xp-faq__answer { animation: faq-in 0.45s var(--ease-out); }
@keyframes faq-in { from { opacity: 0; transform: translateY(-6px); } }

/* Enquiry CTA */
.xp-cta {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(70% 90% at 50% 110%, rgba(25, 67, 118, 0.6), rgba(25, 67, 118, 0) 70%),
    linear-gradient(180deg, var(--ink) 0%, #0c1830 100%);
  color: var(--white);
}
.xp-cta__inner {
  display: grid;
  justify-items: center;
  padding: clamp(5rem, 11vw, 8.5rem) var(--inner-x);
  text-align: center;
}
.xp-cta .xp-eyebrow { justify-content: center; }
.xp-cta__title {
  max-width: 18ch;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 5.75rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.025em;
}
.xp-cta__title em { font-style: italic; font-weight: 500; color: var(--gold); }
.xp-cta__text { max-width: 46ch; margin: 1.5rem 0 0; line-height: 1.7; color: var(--silver); }
.xp-cta__actions { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 1.25rem 2.25rem; margin-top: 2.5rem; }

/* Hub */
.xp-hub {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 1.5rem);
  margin: 0;
  padding: clamp(4rem, 8vw, 6rem) 0 0;
  list-style: none;
}
.xp-hubcard a {
  display: grid;
  align-content: start;
  gap: 0.8rem;
  height: 100%;
  padding: clamp(1.75rem, 3vw, 2.5rem);
  border: 1px solid var(--paper-line);
  border-radius: 14px;
  background: var(--white);
  transition: border-color 0.3s ease, box-shadow 0.4s ease, transform 0.5s var(--ease-out);
}
.xp-hubcard__num { font-size: 0.75rem; font-weight: 700; letter-spacing: 0.16em; color: var(--navy); }
.xp-hubcard h2 { margin: 1.5rem 0 0; font-family: var(--font-display); font-size: clamp(1.5rem, 2.2vw, 2rem); font-weight: 600; line-height: 1.1; }
.xp-hubcard p { margin: 0; line-height: 1.6; color: var(--paper-muted); }
.xp-hubcard__go { display: inline-flex; align-items: center; gap: 0.75rem; margin-top: 1rem; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--navy); }
.xp-hubcard__go svg { transition: transform 0.5s var(--ease-out); }
.xp-hubcard a:hover,
.xp-hubcard a:focus-visible { border-color: var(--navy); box-shadow: 0 24px 50px -36px rgba(14, 27, 46, 0.5); transform: translateY(-4px); }
.xp-hubcard a:hover .xp-hubcard__go svg { transform: translateX(8px); }

/* Responsive ------------------------------------------------------------ */
@media (max-width: 1180px) {
  .xp-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); row-gap: 3.5rem; }
  .xp-steps::before, .xp-steps::after { display: none; }
  .xp-step::before { top: -1.6rem; }
  .xp-steps { padding-top: 1.75rem; }
  .xp-apps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 1023px) {
  :root { --inner-x: 1.25rem; }
  .xp-hero__inner { padding-top: calc(76px + 3rem); }
  .xp-hero__image { inset: 0; opacity: 0.4; -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 90%); mask-image: linear-gradient(180deg, #000 0%, transparent 90%); }
  .xp-overview,
  .xp-faqs { grid-template-columns: 1fr; }
  .xp-caps,
  .xp-related,
  .xp-hub { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .xp-qsc { grid-template-columns: 1fr; }
  .xp-scope { grid-template-columns: 1fr; }
  .xp-slab { padding-inline: 1.25rem; }
}
@media (max-width: 640px) {
  .xp-caps,
  .xp-related,
  .xp-hub,
  .xp-apps,
  .xp-steps { grid-template-columns: 1fr; }
  .xp-steps { row-gap: 2.25rem; padding-top: 0; padding-left: 1.75rem; border-left: 2px solid var(--paper-line); }
  .xp-step::before { top: 0.35rem; left: calc(-1.75rem - 8px); }
  .xp-scope__list { columns: 1; }
  .xp-value { grid-template-columns: 1fr; gap: 0.4rem; }
  .xp-faq__answer p { padding-right: 0; }
  .xp-slab span:last-child { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal],
  .xp-hero__lead, .xp-hero__actions, .xp-hero .xp-eyebrow, .xp-crumbs { opacity: 1; transform: none; }
  .xp-hero__image { transform: none; }
  .xp-step { opacity: 1; }
  .xp-step::before { border-color: var(--navy); background: var(--navy); }
  .xp-steps::after { transform: scaleX(1); }
}