/* === Layout · containers, grid, sectioning, sticky header === */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 inline auto;
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.container--wide {
  max-width: none;
  padding-inline: var(--container-pad);
}

.container--narrow {
  max-width: 880px;
}

.section {
  padding-block: var(--space-10);
  position: relative;
}

.section--tight   { padding-block: var(--space-8); }
.section--loose   { padding-block: var(--space-11); }
.section--hero    { padding-block: clamp(2rem, 6vw, 4rem) clamp(2rem, 6vw, 4rem); }

@media (max-width: 768px) {
  .section { padding-block: var(--space-8); }
  .section--loose { padding-block: var(--space-9); }
}

.section + .section {
  border-top: var(--border-w) solid var(--color-border);
}

.grid {
  display: grid;
  gap: var(--gutter);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gutter);
}

@media (max-width: 900px) {
  .grid-12 { grid-template-columns: repeat(6, 1fr); }
}

@media (max-width: 560px) {
  .grid-12 { grid-template-columns: repeat(2, 1fr); }
}

.span-12 { grid-column: span 12; }
.span-10 { grid-column: span 10; }
.span-8  { grid-column: span 8; }
.span-7  { grid-column: span 7; }
.span-6  { grid-column: span 6; }
.span-5  { grid-column: span 5; }
.span-4  { grid-column: span 4; }
.span-3  { grid-column: span 3; }
.span-2  { grid-column: span 2; }

@media (max-width: 900px) {
  .span-8, .span-7, .span-10  { grid-column: span 6; }
  .span-6 { grid-column: span 6; }
  .span-5, .span-4 { grid-column: span 3; }
  .span-3, .span-2 { grid-column: span 2; }
}

@media (max-width: 560px) {
  [class*="span-"] { grid-column: span 2; }
}

.section-head {
  display: grid;
  grid-template-columns: minmax(auto, 220px) 1fr;
  gap: var(--space-7);
  align-items: baseline;
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-5);
  border-bottom: var(--border-w) solid var(--color-border);
}

.section-head__kicker {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-kicker);
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.section-head__title {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  line-height: var(--lh-heading);
  letter-spacing: var(--ls-heading);
  font-weight: 400;
  max-width: 18ch;
}

@media (max-width: 720px) {
  .section-head { grid-template-columns: 1fr; gap: var(--space-3); }
}

/* Utility · flex */
.flex          { display: flex; }
.flex-col      { flex-direction: column; }
.items-center  { align-items: center; }
.items-baseline{ align-items: baseline; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }

/* Sticky header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 10, 11, 0.78);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: var(--border-w) solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
  padding-inline: var(--container-pad);
  max-width: var(--container-max);
  margin-inline: auto;
}

/* Footer */
.site-footer {
  border-top: var(--border-w) solid var(--color-border);
  padding-block: var(--space-9) var(--space-6);
  background: var(--color-bg);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-7);
  padding-block: 0 var(--space-8);
  border-bottom: var(--border-w) solid var(--color-border);
}

@media (max-width: 800px) {
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .site-footer__grid { grid-template-columns: 1fr; }
}

.site-footer__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding-top: var(--space-5);
}