/* ==========================================================================
   Layout - containers, grid system, structural page regions
   ========================================================================== */

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

.container--sm {
  max-width: var(--container-sm);
}
.container--md {
  max-width: var(--container-md);
}
.container--lg {
  max-width: var(--container-lg);
}
.container--2xl {
  max-width: var(--container-2xl);
}
.container--full {
  max-width: none;
}

main {
  display: block;
  min-height: 60vh;
}

/* ---------------------------------------------------------------------
   Section rhythm
   --------------------------------------------------------------------- */
.section {
  padding-block: var(--space-20);
  position: relative;
}

.section--sm {
  padding-block: var(--space-12);
}

.section--lg {
  padding-block: var(--space-32);
}

.section--tight-top {
  padding-top: var(--space-8);
}

.section-header {
  max-width: 720px;
  margin-bottom: var(--space-12);
}

.section-header--center {
  margin-inline: auto;
  text-align: center;
}

/* ---------------------------------------------------------------------
   Grid System (12-column, CSS Grid based)
   --------------------------------------------------------------------- */
.grid {
  display: grid;
  gap: var(--grid-gutter);
  grid-template-columns: repeat(var(--grid-columns), 1fr);
}

.grid--gap-sm {
  gap: var(--space-4);
}
.grid--gap-lg {
  gap: var(--space-10);
}

.grid--2 {
  grid-template-columns: repeat(2, 1fr);
}
.grid--3 {
  grid-template-columns: repeat(3, 1fr);
}
.grid--4 {
  grid-template-columns: repeat(4, 1fr);
}
.grid--5 {
  grid-template-columns: repeat(5, 1fr);
}
.grid--6 {
  grid-template-columns: repeat(6, 1fr);
}
.grid--auto-fit {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.grid--auto-fit-sm {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.col-span-2 {
  grid-column: span 2;
}
.col-span-3 {
  grid-column: span 3;
}
.col-span-4 {
  grid-column: span 4;
}
.col-span-6 {
  grid-column: span 6;
}
.col-span-8 {
  grid-column: span 8;
}
.col-span-12 {
  grid-column: 1 / -1;
}

/* ---------------------------------------------------------------------
   Split / two-column layout used across hero and content sections
   --------------------------------------------------------------------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.split--reverse {
  direction: rtl;
}
.split--reverse > * {
  direction: ltr;
}

.split--top {
  align-items: start;
}

/* ---------------------------------------------------------------------
   Page shell (used on pages with sidebar: blog, blog-post)
   --------------------------------------------------------------------- */
.page-shell {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--space-12);
  align-items: start;
}

.page-shell__main {
  min-width: 0;
}

/* ---------------------------------------------------------------------
   Index shell (home page) - a sticky in-page section index alongside a
   long-scroll narrative. Sticks below the global site header, not over it.
   --------------------------------------------------------------------- */
.index-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
}

.index-rail {
  position: sticky;
  top: 76px;
  height: calc(100vh - 76px);
  padding: var(--space-10) var(--space-6) var(--space-6);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
}

.index-rail__kicker {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

.index-rail__nav {
  margin-top: var(--space-10);
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow-y: auto;
}

.index-rail__cta {
  margin-top: var(--space-6);
}

.index-main {
  min-width: 0;
}

.index-panel {
  padding-block: var(--space-16);
  padding-inline: var(--space-10);
  border-bottom: 1px solid var(--color-border);
}

.index-panel:last-child {
  border-bottom: none;
}

.index-panel__title {
  margin-top: var(--space-2);
  font-size: var(--fs-2xl);
  max-width: 24ch;
}

/* Used for a sub-heading inside a panel that already carries its own
   index-panel__title above it (e.g. the "Technology" heading under the
   Process & Stack panel) - same element, smaller scale. */
.index-panel__title--sub {
  font-size: var(--fs-xl);
}

.index-panel__group + .index-panel__group {
  margin-top: var(--space-16);
}

/* ---------------------------------------------------------------------
   Header layout
   --------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  width: 100%;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--glass-border);
  transition: var(--transition-base);
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-md);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  height: 76px;
}

.site-header__logo {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ---------------------------------------------------------------------
   Footer layout
   --------------------------------------------------------------------- */
.site-footer {
  background: var(--gradient-surface);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-16);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr) 1.2fr;
  gap: var(--space-10);
  padding-bottom: var(--space-12);
}

.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-6);
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.site-footer__legal {
  display: flex;
  gap: var(--space-6);
}

/* ---------------------------------------------------------------------
   Flex layout helpers used structurally (not purely utility)
   --------------------------------------------------------------------- */
.stack {
  display: flex;
  flex-direction: column;
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}
.cluster.items-start {
  flex-wrap: nowrap;
}
.cluster.items-start > .badge {
  flex-shrink: 0;
}
.cluster.items-start > div {
  min-width: 0;
}