/* ==========================================================================
   Layout — containers, grid scaffolding, header/footer structure, sections.
   ========================================================================== */

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

/* Narrow variants left-align (flush with the rest of the page's content edge)
   rather than re-centering — a centered island inside an otherwise
   left-aligned page reads as the "floating narrow column" problem. */
.container--narrow {
  max-width: var(--container-narrow);
  margin-inline: 0;
}

.container--text {
  max-width: var(--container-text);
  margin-inline: 0;
}

.container--narrow.container--center,
.container--text.container--center {
  margin-inline: auto;
}

.container--wide {
  max-width: var(--container-wide);
}

.section {
  padding-block: var(--space-2xl);
}

.section--tight {
  padding-block: var(--space-xl);
}

.section--band {
  border-block: var(--border-hairline);
}

.on-dark.section--band {
  border-block: var(--border-hairline-inverse);
}

/* ---- Blueprint corner ticks --------------------------------------------
   Architectural drawing motif: small L-shaped tick marks on framed panels. */
.blueprint-frame {
  position: relative;
  border: var(--border-hairline);
}

.blueprint-frame::before,
.blueprint-frame::after {
  content: '';
  position: absolute;
  inline-size: 10px;
  block-size: 10px;
  border-color: var(--color-accent-strong);
  border-style: solid;
  border-width: 0;
}

.blueprint-frame::before {
  inset-block-start: -1px;
  inset-inline-start: -1px;
  border-block-start-width: 2px;
  border-inline-start-width: 2px;
}

.blueprint-frame::after {
  inset-block-end: -1px;
  inset-inline-end: -1px;
  border-block-end-width: 2px;
  border-inline-end-width: 2px;
}

/* ---- Site header --------------------------------------------------------- */
.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: var(--z-nav);
  background-color: var(--color-bg-inverse);
  border-block-end: var(--border-hairline-inverse);
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  block-size: 4.5rem;
}

.primary-nav {
  display: none;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

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

@media (min-width: 1440px) {
  .primary-nav {
    display: block;
  }

  .nav-toggle {
    display: none;
  }
}

/* ---- Mobile nav panel ----------------------------------------------------- */
.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background-color: var(--color-bg-inverse);
  display: flex;
  flex-direction: column;
  padding: var(--space-md) var(--gutter) var(--space-lg);
  overflow-y: auto;
}

.mobile-nav[hidden] {
  display: none;
}

.mobile-nav__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  block-size: 4.5rem;
}

.mobile-nav__list {
  display: flex;
  flex-direction: column;
  margin-block-start: var(--space-lg);
}

.mobile-nav__list li {
  border-block-end: var(--border-hairline-inverse);
}

.mobile-nav__list a {
  display: block;
  padding-block: var(--space-md);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text-inverse);
  text-decoration: none;
}

.mobile-nav__cta {
  margin-block-start: var(--space-lg);
}

@media (min-width: 1440px) {
  .mobile-nav,
  .nav-toggle {
    display: none !important;
  }
}

/* ---- Footer --------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-bg-inverse);
  color: var(--color-text-inverse);
  border-block-start: var(--border-hairline-inverse);
}

.footer-grid {
  display: grid;
  gap: var(--space-lg) var(--space-xl);
  grid-template-columns: 1fr;
  padding-block: var(--space-2xl);
}

.footer-grid__brand {
  max-width: 32ch;
}

.footer-nav-group h2 {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-text-inverse);
  margin-block-end: var(--space-sm);
}

.footer-nav-group ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.footer-bottom {
  border-block-start: var(--border-hairline-inverse);
  padding-block: var(--space-md);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  font-size: var(--text-xs);
  color: var(--color-text-inverse-muted);
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
  }
}

/* ---- Asymmetric split (editorial 2-column composition) --------------------- */
.split {
  display: grid;
  gap: var(--space-xl);
}

@media (min-width: 1024px) {
  .split--wide-narrow {
    grid-template-columns: 1.3fr 1fr;
    align-items: center;
  }
}

/* ---- General page grids --------------------------------------------------- */
.grid {
  display: grid;
  gap: var(--space-md);
}

.grid--2 {
  grid-template-columns: 1fr;
}

.grid--3 {
  grid-template-columns: 1fr;
}

.grid--4 {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
}

.stack > * + * {
  margin-block-start: var(--space-md);
}

.stack--tight > * + * {
  margin-block-start: var(--space-sm);
}