/* Containers, page chrome, and grids. Mobile-first. */

.container {
  width: 100%;
  margin-inline: auto;
  padding-inline: var(--space-4);
  max-width: var(--measure-wide);
}

.container--prose {
  max-width: calc(var(--measure-prose) + var(--space-4) * 2);
}

@media (min-width: 48rem) {
  .container {
    padding-inline: var(--space-6);
  }
}

@media (min-width: 64rem) {
  .container {
    padding-inline: var(--space-7);
  }
}

/* Site header */
.site-header {
  border-bottom: var(--hairline);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  height: var(--header-height);
}

.site-header__brand {
  font-family: var(--font-display);
  font-size: var(--fs-150);
  font-weight: 500;
  letter-spacing: var(--ls-tight);
  color: var(--ink);
  text-decoration: none;
}

.site-header__brand:hover {
  color: var(--accent);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.site-nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: var(--fs-100);
  font-family: var(--font-body);
  position: relative;
  padding-block: var(--space-2);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--accent);
}

.site-nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  border-bottom: 1.5px solid var(--accent);
}

.site-nav__search {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: var(--radius-sm);
}

.site-nav__search svg {
  width: 1.125rem;
  height: 1.125rem;
}

.site-nav__search:hover {
  background: var(--accent-bg);
}

/* Hide the active underline on the search icon — its filled state is enough. */
.site-nav__search[aria-current="page"]::after {
  display: none;
}

.site-nav__search[aria-current="page"] {
  background: var(--accent-bg);
}

@media (max-width: 32rem) {
  .site-nav {
    gap: var(--space-3);
  }
  .site-header__brand {
    font-size: var(--fs-125);
  }
}

/* Site footer */
.site-footer {
  border-top: var(--hairline);
  margin-top: var(--space-9);
  padding-block: var(--space-7);
  color: var(--muted);
  font-size: var(--fs-75);
}

.site-footer__inner {
  display: grid;
  gap: var(--space-5);
  max-width: var(--measure-prose);
  margin-inline: auto;
}

.site-footer__credits {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  align-items: center;
}

.site-footer a {
  color: var(--muted);
}

.site-footer a:hover {
  color: var(--accent);
}

/* Main content region */
main {
  display: block;
  padding-block: var(--space-7);
}

@media (min-width: 48rem) {
  main {
    padding-block: var(--space-8);
  }
}

/* Library / card grid */
.card-grid {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

@media (min-width: 40rem) {
  .card-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-6);
  }
}

@media (min-width: 64rem) {
  .card-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* Section header (used above grids and lists) */
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: var(--hairline);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-5);
}

.section-header__title {
  font-family: var(--font-display);
  font-size: var(--fs-200);
  font-weight: 500;
}

.section-header__link {
  font-size: var(--fs-75);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
}

.section-header__link:hover {
  color: var(--accent);
}

/* Stack utility — vertical rhythm helper */
.stack > * + * {
  margin-top: var(--space-4);
}

.stack-lg > * + * {
  margin-top: var(--space-6);
}

.stack-xl > * + * {
  margin-top: var(--space-8);
}