/* ============================================================
   LAYOUT — header, footer, grids
   ============================================================ */

/* --- SITE HEADER -------------------------------------------- */

.site-header {
  position: static;
  z-index: 100;
  background: var(--bg);
}

.site-header__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: 72px;
}

.site-header__logo {
  display: flex;
  align-items: baseline;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
}

.site-header__brand {
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: var(--ls-tight);
}

.site-header__nav {
  display: contents;
}

.site-header__menu {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
}

.site-header__nav .btn {
  justify-self: end;
}

.site-header__menu a {
  font-size: var(--fs-small);
  font-weight: 500;
  text-decoration: none;
  color: var(--ink);
  padding: 4px 0;
  transition: color 0.15s;
}

.site-header__menu a:hover {
  color: var(--ink-2);
}

.site-header__menu a:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 4px;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 12px;
  background: none;
  border: none;
  cursor: pointer;
}

.site-header__toggle span {
  display: block;
  height: 2px;
  background: var(--ink);
  border-radius: 1px;
  transition: transform 0.2s, opacity 0.2s;
}

.site-header__toggle[aria-expanded="true"] span:first-child {
  transform: translateY(3.5px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

/* Mobile nav */
@media (max-width: 768px) {
  .site-header__nav {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 24px;
    background: var(--bg);
    border-top: 1px solid var(--line);
    z-index: 200;
  }

  .site-header__nav.is-open {
    display: flex;
  }

  .site-header__backdrop {
    display: none;
    position: fixed;
    inset: 72px 0 0;
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 199;
  }

  .site-header__backdrop.is-open {
    display: block;
  }

  .site-header__menu {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-header__menu a {
    display: block;
    font-size: 1.125rem;
    font-weight: 400;
    padding: 14px 24px;
    margin: 0 -24px;
    line-height: 1.6;
    border-bottom: 1px solid var(--line);
  }

  .site-header__menu li:last-child a {
    border-bottom: none;
  }

  .site-header__nav .btn {
    margin-top: 24px;
  }

  .site-header {
    position: sticky;
    top: 0;
  }

  .site-header__inner {
    grid-template-columns: 1fr auto;
  }

  .site-header__toggle {
    display: flex;
    justify-self: end;
  }
}

/* --- SITE FOOTER -------------------------------------------- */

.site-footer {
  background: var(--inverse-bg);
  color: var(--inverse-ink-2);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 5fr 3fr 3fr;
  gap: var(--gutter);
  padding-top: 64px;
  padding-bottom: 48px;
}

.site-footer__about {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.site-footer__brand {
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--inverse-ink);
  letter-spacing: var(--ls-tight);
}

.site-footer__about p {
  font-size: var(--fs-small);
  line-height: var(--lh-body);
  max-width: 36ch;
}

.site-footer__heading {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--inverse-ink-2);
  display: block;
  margin-bottom: 16px;
}

.site-footer__col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__col a {
  font-size: var(--fs-small);
  text-decoration: none;
  color: var(--inverse-ink);
  transition: color 0.15s;
}

.site-footer__col a:hover {
  color: var(--inverse-ink-2);
}

.site-footer__col a:focus-visible {
  outline: 2px solid var(--inverse-ink);
  outline-offset: 2px;
}

.site-footer__bottom {
  padding-top: 24px;
  padding-bottom: 32px;
  border-top: 1px solid var(--inverse-line);
  font-size: var(--fs-small);
}

.site-footer__bottom a {
  color: var(--inverse-ink-2);
  text-decoration: none;
}

.site-footer__bottom a:hover {
  color: var(--inverse-ink);
}

@media (max-width: 768px) {
  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

/* --- GRID UTILITIES ----------------------------------------- */

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gutter);
}

.grid-offers {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--gutter);
}

.grid-offers > :nth-child(1),
.grid-offers > :nth-child(2) {
  grid-column: span 3;
}

.grid-offers > :nth-child(n+3) {
  grid-column: span 2;
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

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

  .grid-offers > * {
    grid-column: span 1 !important;
  }
}

.logo__accent {
  color: var(--logo-accent);
}