/* ==========================================================================
   Layout — containers, grid, page structure
   ========================================================================== */

/* --- Page wrapper --- */
.site {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-main {
  flex: 1;
  padding: var(--space-xl) var(--space-md);
}

/* --- Containers --- */
.container {
  width: 100%;
  max-width: var(--wide-width);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.container--narrow {
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.container--mid {
  max-width: 52rem;
  margin-inline: auto;
  padding-inline: var(--space-md);
}

/* --- Beta banner --- */
.atopos-beta-banner {
  background-color: color-mix(in srgb, var(--color-accent-green) 15%, var(--color-ground));
  border-bottom: var(--border-width) solid color-mix(in srgb, var(--color-leaf) 40%, transparent);
  padding: var(--space-sm) var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  font-size: var(--text-xs);
  color: var(--color-leaf);
}

.atopos-beta-banner__text {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.atopos-beta-banner__counter {
  font-weight: 600;
  color: var(--color-parchment);
}

.atopos-beta-banner__dismiss {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-sand);
  padding: var(--space-xs);
  line-height: 1;
  font-size: var(--text-sm);
  flex-shrink: 0;
}

.atopos-beta-banner__dismiss:hover {
  color: var(--color-parchment);
}

.atopos-beta-banner[hidden] {
  display: none;
}

/* --- Site header --- */
.site-header {
  border-bottom: var(--border-width) solid var(--border-color);
  padding: var(--space-md) 0;
}

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

.site-header__wordmark {
  font-size: var(--text-xl);
}

/* --- Skip link --- */
.skip-link:focus-visible {
  position: fixed;
  top: var(--space-sm);
  left: var(--space-sm);
  width: auto;
  height: auto;
  overflow: visible;
  clip: auto;
  white-space: normal;
  background-color: var(--color-ground);
  color: var(--color-parchment);
  border: 2px solid var(--color-silver);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  z-index: 9999;
  text-decoration: none;
}

/* --- Primary navigation --- */
.primary-nav__list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.primary-nav__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-sand);
  text-decoration: none;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: color var(--transition);
}

.primary-nav__link:hover,
.primary-nav__link:focus {
  color: var(--color-parchment);
}

.primary-nav__link[aria-current="page"] {
  color: var(--color-parchment);
  text-decoration: underline;
  text-underline-offset: 0.3em;
}

.primary-nav__link--cta {
  background-color: var(--color-accent-green);
  color: var(--color-parchment);
  padding: 0.6875rem var(--space-md);
  border-radius: var(--radius-sm);
  min-height: 44px;
}

.primary-nav__link--cta:hover,
.primary-nav__link--cta:focus {
  background-color: color-mix(in srgb, var(--color-accent-green) 85%, #000000);
  color: var(--color-parchment);
}

.primary-nav__link--cta[aria-current="page"] {
  text-decoration: none;
  opacity: 0.9;
}

/* --- Site footer --- */
.site-footer {
  border-top: var(--border-width) solid var(--border-color);
  padding: var(--space-lg) 0;
  font-size: var(--text-xs);
  color: var(--color-sand);
}

.footer-nav__list a,
.legal-nav__list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding-inline: var(--space-xs);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  justify-content: space-between;
  align-items: flex-start;
}

/* --- Paper grid (archive) --- */
.papers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 36rem), 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

/* --- Paper card --- */
.paper-card {
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: border-color var(--transition);
}

.paper-card:hover {
  border-color: var(--color-sand);
}

/* --- Responsive --- */
@media (max-width: 48rem) {
  .site-header__inner {
    flex-wrap: wrap;
    gap: var(--space-sm);
  }
  .primary-nav {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .primary-nav__list {
    gap: var(--space-md);
    flex-wrap: wrap;
  }
  .primary-nav__link {
    min-height: 40px;
    font-size: 0.65rem;
  }
}