/* ==========================================================================
   layout.css — container, header, footer, section scaffolding, page heads
   ========================================================================== */

.container {
  width: min(100% - 2 * var(--gutter), var(--container));
  margin-inline: auto;
}

/* Blueprint grid used behind dark sections (matches the original hero) */
.hero__grid,
.page-head__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 80% 90% at 70% 40%, #000 0%, transparent 78%);
  mask-image: radial-gradient(ellipse 80% 90% at 70% 40%, #000 0%, transparent 78%);
  pointer-events: none;
}

/* ---- Header -------------------------------------------------------------
   The whole header is sticky but offset by the top bar's height, so the thin
   contact bar scrolls away while the main bar stays pinned.                  */
.site-header {
  position: sticky;
  top: calc(var(--topbar-h) * -1);
  z-index: 100;
  background: var(--ink);
  color: var(--on-dark);
}

.topbar {
  height: var(--topbar-h);
  border-bottom: 1px solid var(--ink-line);
  font-size: 0.8125rem;
  color: var(--on-dark-muted);
}

.topbar__inner {
  display: flex;
  height: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.topbar__item,
.topbar__item a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.topbar__item--end {
  gap: 28px;
}

.topbar a:hover {
  color: var(--hover);
}

.mainbar {
  height: var(--mainbar-h);
  border-bottom: 1px solid var(--ink-line);
}

.mainbar__inner {
  display: flex;
  height: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand img {
  width: auto;
  height: 46px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav__list {
  display: flex;
  gap: 30px;
}

.nav__link {
  position: relative;
  display: block;
  padding: 6px 0;
  font-family: var(--font-display);
  font-size: 1.1875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--on-dark);
  transition: color 0.2s;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.nav__link:hover {
  color: var(--hover);
}

.nav__link[aria-current="page"] {
  color: var(--white);
}

.nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: 1px solid var(--ink-line);
  border-radius: var(--radius);
  align-items: center;
  justify-content: center;
}

.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--white);
  transition: transform 0.25s, opacity 0.2s;
}

.nav-toggle__bars {
  position: relative;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle__bars::before {
  top: -6px;
}

.nav-toggle__bars::after {
  top: 6px;
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  transform: translateY(-6px) rotate(-45deg);
}

/* ---- Sections ---------------------------------------------------------- */
.section {
  padding-block: clamp(64px, 9vw, 112px);
}

.section--white {
  background: var(--white);
}

.section--paper-2 {
  background: var(--paper-2);
}

.section-head {
  margin-bottom: clamp(32px, 5vw, 56px);
  max-width: 760px;
}

.section-head--split {
  display: flex;
  max-width: none;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}

.section-head__title {
  font-size: clamp(2.125rem, 4.6vw, 3.5rem);
}

.section-head__lede {
  margin-top: 16px;
  font-size: 1.125rem;
  color: var(--muted);
}

/* ---- Page heads (inner pages) ------------------------------------------ */
.page-head {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--white);
}

.page-head__inner {
  position: relative;
  padding-block: clamp(40px, 6vw, 72px);
}

.page-head--compact .page-head__inner {
  padding-block: 20px;
}

.page-head__title {
  margin-top: 20px;
  font-size: clamp(2.75rem, 6.5vw, 5rem);
}

.page-head__lede {
  max-width: 640px;
  margin-top: 16px;
  margin-bottom: 28px;
  font-size: 1.1875rem;
  color: var(--on-dark-muted);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  font-size: 0.875rem;
  color: var(--on-dark-muted);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--on-dark-dim);
}

.breadcrumb a:hover {
  color: var(--hover);
}

.breadcrumb [aria-current] {
  color: var(--on-dark);
}

/* ---- Footer ------------------------------------------------------------ */
.site-footer {
  background: var(--ink);
  color: var(--on-dark-muted);
  font-size: 0.96875rem;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.4fr;
  gap: 48px;
  padding-block: 72px 56px;
}

.footer__about img {
  width: auto;
  height: 52px;
}

.footer__tag {
  margin-block: 20px 8px;
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--white);
}

.footer__about p:last-child {
  max-width: 34ch;
}

.footer__title {
  margin-bottom: 18px;
  font-size: 1.125rem;
  letter-spacing: 0.1em;
  color: var(--white);
}

.footer__col li + li {
  margin-top: 10px;
}

.footer__col a:hover {
  color: var(--hover);
}

.footer__contact p {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.footer__contact p + p {
  margin-top: 14px;
}

.footer__contact a {
  overflow-wrap: anywhere;
}

.footer__contact .icon {
  flex: none;
  margin-top: 4px;
  color: var(--accent-bright);
}

.footer__legal {
  border-top: 1px solid var(--ink-line);
  font-size: 0.875rem;
}

.footer__legal-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-block: 22px;
}

/* ---- Responsive -------------------------------------------------------- */
@media (max-width: 1000px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 900px) {
  :root {
    --mainbar-h: 64px;
  }

  .topbar__item:first-child {
    display: none;
  }

  .topbar__inner {
    justify-content: flex-end;
  }

  .brand img {
    height: 40px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 20px;
    padding: 12px var(--gutter) 28px;
    background: var(--ink-2);
    border-bottom: 1px solid var(--ink-line);
  }

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

  .nav__list {
    flex-direction: column;
    gap: 0;
  }

  .nav__link {
    padding: 14px 0;
    font-size: 1.5rem;
    border-bottom: 1px solid var(--ink-line);
  }

  .nav__link::after {
    display: none;
  }

  .nav__cta {
    justify-content: center;
  }
}

@media (max-width: 640px) {
  :root {
    --topbar-h: 0px;
  }

  .topbar {
    display: none;
  }

  .section-head--split {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 36px;
    padding-block: 56px 40px;
  }

  .footer__legal-inner {
    flex-direction: column;
    gap: 4px;
  }
}

/* ---- Additional mobile fixes (appended) -------------------------------- */

/* Card grid: 2-col on tablet, 1-col on mobile */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
  gap: 24px;
}

@media (max-width: 640px) {
  .card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* Section padding tighter on mobile */
  .section {
    padding-block: clamp(44px, 8vw, 64px);
  }

  /* Section head single col */
  .section-head--split {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .section-head__title {
    font-size: clamp(1.75rem, 7vw, 2.5rem);
  }

  /* Footer single col */
  .footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-block: 48px 36px;
  }

  .footer__legal-inner {
    flex-direction: column;
    gap: 4px;
    font-size: 0.8125rem;
  }
}

@media (max-width: 480px) {
  /* Prevent topbar items from overflowing on narrow screens */
  .topbar__item--end {
    gap: 16px;
  }

  .topbar__item--end span {
    display: none; /* show icons only */
  }
}