/* Expertise → Artificial Intelligence & Data Science. Bespoke landing-style
   layout on the tl- design system: typographic hero, a four-phase lifecycle
   overview that anchors into per-phase sections of service cards, and two
   "beyond the lifecycle" panels. Loaded only by pages/expertise/data-science.js. */

html { scroll-behavior: smooth; }

/* Hero reuses the shared .tl-xp-hero classes (expertise.css) so the breadcrumb
   and "Expertise area" eyebrow match the other expertise pages exactly. */

/* --- Lifecycle overview ------------------------------------------------ */
.tl-ds-flow {
  list-style: none; margin: var(--space-8) 0 0; padding: 0;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-4);
}
.tl-ds-flow__node { position: relative; }
/* forward chevron sitting in the gap between phase cards */
.tl-ds-flow__node:not(:last-child)::after {
  content: ""; position: absolute; z-index: 2; top: 50%; right: 0;
  width: 8px; height: 8px;
  border-top: 2px solid var(--neutral-300); border-right: 2px solid var(--neutral-300);
  transform: translate(calc(50% + var(--space-4) / 2), -50%) rotate(45deg);
}
.tl-ds-flow__link {
  display: flex; flex-direction: column; align-items: flex-start; gap: 10px;
  height: 100%; padding: var(--space-5);
  background: var(--surface-card); border: 1px solid var(--border-1);
  border-radius: var(--radius-lg); text-decoration: none;
  transition: transform var(--dur-base, .18s) var(--ease-out, ease),
              box-shadow var(--dur-base, .18s) var(--ease-out, ease),
              border-color var(--dur-base, .18s) var(--ease-out, ease);
}
.tl-ds-flow__link:hover {
  transform: translateY(-3px); box-shadow: var(--shadow-2);
  border-color: var(--orange-700);
}
.tl-ds-flow__top {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-3); width: 100%;
}
.tl-ds-flow__num {
  font-size: 13px; font-weight: var(--weight-bold, 700);
  letter-spacing: 0.08em; color: var(--fg-accent); font-variant-numeric: tabular-nums;
}
.tl-ds-flow__icon {
  display: inline-flex; width: 40px; height: 40px; border-radius: 11px;
  align-items: center; justify-content: center;
  background: var(--surface-accent); color: var(--fg-accent);
}
.tl-ds-flow__name { font-size: 15px; font-weight: var(--weight-semibold); color: var(--fg-1); line-height: 1.25; }
.tl-ds-flow__count { margin-top: auto; font-size: 12px; color: var(--fg-3); }
@media (max-width: 1080px) {
  .tl-ds-flow { grid-template-columns: repeat(2, 1fr); }
  .tl-ds-flow__node::after { display: none; }
}
@media (max-width: 540px) { .tl-ds-flow { grid-template-columns: 1fr; } }

/* --- Phase sections (editorial, no cards) ------------------------------ */
/* Each phase is a plain section separated by whitespace and hairlines, not a
   boxed card. A large phase number + name head it; the services below are
   two-column rows (name on the left, description on the right) divided by thin
   rules — a spec-sheet / editorial pattern rather than a grid of cards. */
.tl-ds-phase { scroll-margin-top: 88px; }
/* The phase head pins below the sticky nav (76px) while its own phase scrolls,
   then the next phase's head takes over. Solid page-coloured background so the
   service rows pass cleanly underneath. */
.tl-ds-phase__head {
  position: sticky;
  top: 76px;
  z-index: 5;
  background: var(--surface-page);
  display: flex; gap: var(--space-5); align-items: flex-start;
  padding: var(--space-5) 0 var(--space-6); margin-bottom: var(--space-2);
  border-bottom: 1px solid var(--border-1);
}
@media (max-width: 640px) { .tl-ds-phase__head { position: static; } }
.tl-ds-phase__num {
  flex: none; font-size: 48px; line-height: 1; letter-spacing: -0.02em;
  font-weight: 800; color: var(--neutral-300); font-variant-numeric: tabular-nums;
}
.tl-ds-phase__title { margin: 0 0 var(--space-2); font-size: 26px; letter-spacing: -0.01em; color: var(--fg-1); }
.tl-ds-phase__summary { margin: 0; max-width: 64ch; color: var(--fg-2); font-size: 15px; line-height: 1.6; }

.tl-ds-phase__services { display: flex; flex-direction: column; }
.tl-ds-service {
  display: grid;
  grid-template-columns: minmax(0, 4.5fr) minmax(0, 7fr);
  gap: var(--space-4) var(--space-10);
  padding: var(--space-6) 0;
  border-top: 1px solid var(--border-1);
}
.tl-ds-service:first-child { border-top: 0; }
.tl-ds-service__label { display: flex; align-items: flex-start; gap: var(--space-3); }
.tl-ds-service__icon { flex: none; color: var(--fg-accent); margin-top: 1px; }
.tl-ds-service__title {
  margin: 0; font-size: 18px; font-weight: var(--weight-semibold);
  letter-spacing: -0.01em; color: var(--fg-1); line-height: 1.3;
}
.tl-ds-service__body { margin: 0; color: var(--fg-2); font-size: 15px; line-height: 1.7; }
@media (max-width: 760px) {
  .tl-ds-service { grid-template-columns: 1fr; gap: var(--space-3); padding: var(--space-5) 0; }
}
@media (max-width: 640px) {
  .tl-ds-phase__head { gap: var(--space-4); }
  .tl-ds-phase__num { font-size: 36px; }
}

/* --- Beyond the lifecycle --------------------------------------------- */
.tl-ds-extra {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-6);
  margin-top: var(--space-8);
}
@media (max-width: 820px) { .tl-ds-extra { grid-template-columns: 1fr; } }
/* Dark navy panels, matching the site's existing on-dark surfaces
   (--surface-ink, as used by the philosophy band and flagship CTA). */
.tl-ds-extra__panel {
  background: var(--surface-ink);
  color: var(--fg-on-dark);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-top: 3px solid var(--orange-700);
  border-radius: var(--radius-xl); padding: var(--space-8);
  box-shadow: var(--shadow-3, 0 18px 40px rgba(11, 21, 36, 0.22));
}
.tl-ds-extra__icon {
  display: inline-flex; width: 52px; height: 52px; border-radius: 14px;
  align-items: center; justify-content: center;
  background: rgba(255, 165, 59, 0.16); color: var(--orange-500);
  margin-bottom: var(--space-4);
}
.tl-ds-extra__kicker {
  font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase;
  font-weight: var(--weight-semibold); color: var(--orange-500);
  margin-bottom: var(--space-2);
}
.tl-ds-extra__title { margin: 0 0 var(--space-3); font-size: 20px; font-weight: var(--weight-semibold); color: var(--fg-on-dark); line-height: 1.25; }
.tl-ds-extra__body { margin: 0; color: var(--neutral-300); font-size: 14.5px; line-height: 1.65; }