/* ============================================================
   layout.css — containers, grid, page skeleton, breakpoints

   Mobile-first. Breakpoints: 480 / 768 / 1024 / 1440,
   plus 1200 as the threshold where the trace spine earns its column.
   ============================================================ */

/* ---- Containers -------------------------------------------- */

.wrap {
  width: 100%;
  max-width: var(--wrap-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.wrap--narrow { max-width: calc(var(--wrap-narrow) + var(--gutter) * 2); }

/* ---- Header ------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--ink-veil);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-block-end: 1px solid transparent;
  transition: border-color var(--dur) var(--ease-soft),
              background-color var(--dur) var(--ease-soft);
}

/* Condensed state — set by scripts/nav.js past 40px of scroll. */
.site-header[data-scrolled] { border-block-end-color: var(--line); }

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  min-height: 4.5rem;
  transition: min-height var(--dur) var(--ease-soft);
}

.site-header[data-scrolled] .site-header__inner { min-height: 3.75rem; }

/* The wordmark pushes everything else to the right at every size. */
.wordmark { margin-inline-end: auto; }

/* The CTA is persistent at every breakpoint — it is the one conversion
   path and it does not get buried in a drawer. Only the nav collapses.
   Drawer rules live in components.css with the nav component. */
.site-nav { display: none; }

@media (min-width: 1024px) {
  .site-nav { display: block; }
  .site-header__inner { gap: var(--sp-8); }
  .nav-toggle { display: none; }
}

/* ---- Sections ----------------------------------------------- */

.section { padding-block: var(--section-y); }
.section--tight { padding-block: clamp(3rem, 6vw, 5rem); }

.section__head {
  max-width: 46rem;
  margin-block-end: clamp(2.5rem, 5vw, 4rem);
}

.section__head .eyebrow { margin-block-end: var(--sp-4); }
.section__title { font-size: var(--fs-h2); }

.section__lead {
  margin-block-start: var(--sp-4);
  font-size: var(--fs-md);
  color: var(--slate);
  max-width: 42rem;
}

.section__foot { margin-block-start: clamp(2.5rem, 5vw, 4rem); }

/* ---- Page head (inner pages) -------------------------------- */

.page-head {
  padding-block: clamp(3.5rem, 8vw, 7rem) clamp(2rem, 4vw, 3rem);
  border-block-end: 1px solid var(--line);
}

.page-head--compact { padding-block-end: clamp(1.5rem, 3vw, 2rem); }

.page-head .eyebrow { margin-block-end: var(--sp-4); }

.page-head__title {
  font-size: var(--fs-h1-page);
  max-width: 20ch;
}

.page-head__lead {
  margin-block-start: var(--sp-6);
  font-size: var(--fs-md);
  color: var(--slate);
  max-width: 54ch;
}

.page-head__note {
  margin-block-start: var(--sp-4);
  font-size: var(--fs-xs);
  font-family: var(--font-mono);
  color: var(--slate);
}

/* ---- Hero --------------------------------------------------- */

.hero {
  padding-block: clamp(3rem, 8vw, 6.5rem) clamp(3rem, 7vw, 5rem);
  position: relative;
}

.hero__inner { display: grid; }

.hero__title {
  margin-block-start: var(--sp-6);
  max-width: 16ch;
}

/* Each line is a mask; the inner span rises through it on load. */
.hero__title .line {
  display: block;
  overflow: hidden;
  padding-block-end: 0.06em;   /* room for descenders inside the mask */
}

.hero__title .line > span { display: block; }

.hero__lead {
  margin-block-start: var(--sp-8);
  font-size: var(--fs-md);
  color: var(--slate);
  max-width: 52ch;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
  margin-block-start: var(--sp-8);
}

.hero__diagram {
  margin-block-start: clamp(3rem, 7vw, 5rem);
  padding-block: var(--sp-8);
  border-block: 1px solid var(--line);
}

.hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-6);
  margin-block-start: var(--sp-8);
}

@media (min-width: 480px) {
  .hero__stats { grid-template-columns: repeat(3, 1fr); gap: var(--sp-4); }
}

@media (min-width: 1024px) {
  /* Asymmetric: the hero text occupies 9 of 12 columns and the
     right 3 stay empty, so the block reads off-centre by design. */
  .hero__inner { grid-template-columns: repeat(12, 1fr); }
  .hero__inner > * { grid-column: 1 / span 9; }
  .hero__diagram  { grid-column: 1 / span 12; }
  .hero__stats    { grid-column: 1 / span 10; }
}

/* ---- Case study beats (homepage) ---------------------------- */

.cases {
  display: grid;
  gap: clamp(3.5rem, 8vw, 7rem);
}

.case__grid { display: grid; gap: var(--sp-8); }

@media (min-width: 1024px) {
  .case__grid {
    grid-template-columns: repeat(12, 1fr);
    align-items: center;
    gap: var(--sp-12);
  }

  /* Media breaks wider than the text block and sits off-axis. */
  .case__media { grid-column: 1 / span 7; }
  .case__body  { grid-column: 8 / span 5; }

  /* Alternating beat: media right, text left. */
  .case--flip .case__media { grid-column: 6 / span 7; grid-row: 1; }
  .case--flip .case__body  { grid-column: 1 / span 5; grid-row: 1; }
}

/* ---- Card grids --------------------------------------------- */

.work-grid,
.post-grid,
.quote-grid,
.services {
  display: grid;
  gap: var(--sp-8);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .work-grid,
  .post-grid,
  .quote-grid,
  .services { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .post-grid,
  .services  { grid-template-columns: repeat(3, 1fr); }
  .quote-grid { grid-template-columns: repeat(3, 1fr); }
}

/* Work cards stay two-up even at large sizes — the diagrams need
   the width to stay readable. */
@media (min-width: 1440px) {
  .work-grid { gap: var(--sp-12); }
}

.post-list { display: grid; gap: var(--sp-8); }

/* ---- Products ----------------------------------------------- */

.product-list { display: grid; gap: clamp(3rem, 7vw, 6rem); }

.product__inner { display: grid; gap: var(--sp-8); }

@media (min-width: 1024px) {
  .product__inner {
    grid-template-columns: repeat(12, 1fr);
    align-items: center;
    gap: var(--sp-12);
  }
  .product__media { grid-column: 1 / span 6; }
  .product__body  { grid-column: 7 / span 6; }

  /* Alternate the side without needing a modifier class. */
  .product:nth-child(even) .product__media { grid-column: 7 / span 6; grid-row: 1; }
  .product:nth-child(even) .product__body  { grid-column: 1 / span 6; grid-row: 1; }
}

/* ---- Expertise detail --------------------------------------- */

.service-detail-list { display: grid; gap: clamp(3rem, 7vw, 5.5rem); }

.service-detail__cols { display: grid; gap: var(--sp-8); }

@media (min-width: 1024px) {
  .service-detail__cols { grid-template-columns: 1.4fr 1fr; gap: var(--sp-12); }
}

/* ---- Two-column prose + aside (About, Contact) -------------- */

.prose-layout,
.booking-layout {
  display: grid;
  gap: clamp(2.5rem, 6vw, 4rem);
  align-items: start;
}

@media (min-width: 1024px) {
  .prose-layout   { grid-template-columns: minmax(0, 1fr) 20rem; }
  .booking-layout { grid-template-columns: minmax(0, 1fr) 22rem; }

  /* The aside tracks the reader down the page. */
  .prose-layout__aside,
  .booking-layout__aside { position: sticky; top: 6rem; }
}

.booking-layout__aside { display: grid; gap: var(--sp-6); }

/* ---- Case study page --------------------------------------- */

.case-hero { padding-block: clamp(2.5rem, 6vw, 4.5rem) 0; }

.case-hero__title {
  margin-block-start: var(--sp-4);
  font-size: var(--fs-h1-page);
  max-width: 18ch;
}

.case-hero__lead {
  margin-block-start: var(--sp-6);
  font-size: var(--fs-md);
  color: var(--slate);
  max-width: 56ch;
}

.case-hero__media { margin-block-start: clamp(2.5rem, 6vw, 4rem); }

.case-body { padding-block: clamp(3rem, 7vw, 5rem); }

.case-section + .case-section { margin-block-start: clamp(3rem, 7vw, 5rem); }

.case-metrics {
  padding-block: clamp(2.5rem, 5vw, 3.5rem);
  border-block: 1px solid var(--line);
  background: var(--surface);
}

.metric-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-8);
}

@media (min-width: 480px) { .metric-row { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .metric-row { grid-template-columns: repeat(4, 1fr); } }

.case-facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-6);
  margin-block-start: var(--sp-8);
  padding-block-start: var(--sp-8);
  border-block-start: 1px solid var(--line);
  max-width: 46rem;
}

@media (min-width: 768px) { .case-facts { grid-template-columns: repeat(4, 1fr); } }

/* ---- Article page ------------------------------------------- */

.article-head { padding-block: clamp(2.5rem, 6vw, 4rem) 0; }
.article-head__media { margin-block-start: clamp(2.5rem, 6vw, 3.5rem); }
.article-body { padding-block: clamp(3rem, 7vw, 4.5rem); }

.related {
  padding-block: clamp(3rem, 7vw, 5rem);
  border-block-start: 1px solid var(--line);
}

/* ---- Footer ------------------------------------------------- */

.site-footer {
  border-block-start: 1px solid var(--line);
  padding-block-start: clamp(3rem, 6vw, 4.5rem);
  margin-block-start: auto;
}

.site-footer__inner {
  display: grid;
  gap: var(--sp-12);
  padding-block-end: clamp(2.5rem, 5vw, 4rem);
}

/* Columns hug their content rather than stretching to fill. The footer
   carries two link groups; a fractional grid would leave them floating
   absurdly far apart on a wide viewport, and would need editing again
   if a third group is ever added back. */
.site-footer__nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8rem, max-content));
  gap: var(--sp-8) var(--sp-16);
  justify-content: start;
}

@media (min-width: 1024px) {
  .site-footer__inner { grid-template-columns: 22rem 1fr; gap: var(--sp-16); }
}

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--sp-4);
  padding-block: var(--sp-6);
  border-block-start: 1px solid var(--line);
  font-size: var(--fs-xs);
  color: var(--slate);
}

/* ---- 404 ---------------------------------------------------- */

.error-page {
  display: grid;
  align-items: center;
  min-height: 70svh;
  padding-block: var(--section-y);
}

.error-page__inner { max-width: 46rem; }

/* ============================================================
   The trace spine.
   Below 1200px it degrades to a 2px scroll-progress rail at the
   viewport edge — the "simple left-side vertical accent" — and the
   labelled marks are dropped rather than crammed.
   ============================================================ */

.trace {
  position: fixed;
  inset-block: 0;
  inset-inline-start: 0;
  width: 2px;
  z-index: 50;
  pointer-events: none;
}

.trace__marks { display: none; }

.trace__rail {
  position: absolute;
  inset-block: 0;
  inset-inline-start: 0;
  width: 2px;
  background: var(--line);
}

.trace__fill {
  position: absolute;
  inset-block-start: 0;
  inset-inline-start: 0;
  width: 100%;
  height: 0;               /* set by scroll-reveal.js */
  background: var(--trace);
  transform-origin: top;
}

.trace__node { display: none; }

@media (min-width: 1200px) {
  /* The spine now gets a real column, and the homepage shifts right
     to make room. That shift is also what makes the page asymmetric. */
  body[data-page="home"] { padding-inline-start: var(--trace-col); }

  .trace {
    /* Inset below the sticky header and clear of the bottom edge, so
       the node at 0% and 100% progress is never half-hidden under the
       header or clipped off-screen. JS measures trace.clientHeight,
       so the whole 0–1 range maps into this inset box automatically. */
    inset-block: 7rem 4rem;
    width: var(--trace-col);
    display: block;
  }

  .trace__rail {
    inset-block: 0;
    inset-inline-start: 2.5rem;
    width: 1px;
  }

  /* Must span the full rail: marks are absolutely positioned against
     this box using a top computed from trace.clientHeight. Anything
     shorter compresses every mark toward the middle. */
  .trace__marks {
    display: block;          /* overrides the mobile `display: none` */
    position: absolute;
    inset: 0;
  }

  .trace__mark {
    position: absolute;               /* top set by scroll-reveal.js */
    inset-inline-start: 2.5rem;
    transform: translateY(-50%);
  }

  .trace__node {
    display: block;
    position: absolute;
    inset-inline-start: 2.5rem;
    top: 0;                           /* set by scroll-reveal.js */
    width: 9px;
    height: 9px;
    margin-inline-start: -4px;
    margin-block-start: -4px;
    border-radius: 50%;
    background: var(--signal);
    z-index: 1;
  }
}