.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: 2.5rem;
  background: var(--color-bg-subtle);
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

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

.col-span-5 {
  grid-column: span 5;
}

.col-span-6 {
  grid-column: span 6;
}

.col-span-7 {
  grid-column: span 7;
}

.col-span-12 {
  grid-column: span 12;
}

@media (max-width: 900px) {
  .col-span-5,
  .col-span-6,
  .col-span-7 {
    grid-column: span 12;
  }
}