/* Phase 1 institutional navigation; mount only with the new vertical slice. */
.ab-institution {
  --ab-nav-height: 72px;
}

.ab-nav-shell {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 80;
  color: var(--ab-text);
  background: var(--ab-bg);
  border-block-end: 1px solid color-mix(in srgb, var(--ab-line) 45%, transparent);
}

@supports (backdrop-filter: blur(1px)) {
  .ab-nav-shell {
    background: color-mix(in srgb, var(--ab-bg) 84%, transparent);
    backdrop-filter: blur(14px) saturate(112%);
  }
}

.ab-nav-frame {
  min-block-size: var(--ab-nav-height);
  display: flex;
  align-items: center;
  gap: clamp(18px, 2.5vw, 36px);
}

.ab-nav-brand {
  position: relative;
  z-index: 82;
  flex: 0 0 auto;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--ab-text);
}

.ab-primary-nav {
  margin-inline-start: auto;
}

.ab-primary-nav-list {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(14px, 1.8vw, 28px);
}

.ab-primary-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-block-size: 44px;
  padding-block: 4px;
  color: var(--ab-text);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.25;
  text-decoration: none;
  text-underline-offset: 0.34em;
  transition: opacity 160ms ease, transform 120ms ease;
}

.ab-primary-nav a::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  inset-block-end: 6px;
  block-size: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 160ms ease;
}

.ab-primary-nav a:hover {
  opacity: 0.74;
}

.ab-primary-nav a:hover::after,
.ab-primary-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.ab-primary-nav a[aria-current="page"] {
  font-weight: 600;
}

.ab-primary-nav a:active {
  transform: translateY(1px);
}

.ab-nav-toggle {
  position: relative;
  z-index: 82;
  display: none;
  align-items: center;
  gap: 10px;
  min-block-size: 44px;
  min-inline-size: 44px;
  margin-inline-start: auto;
  padding: 8px 0 8px 12px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--ab-text);
  font: inherit;
  cursor: pointer;
}

.ab-nav-toggle-label {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.ab-nav-toggle-mark,
.ab-nav-toggle-mark::before {
  display: block;
  inline-size: 22px;
  block-size: 1px;
  background: currentColor;
  transition: transform 180ms ease;
}

.ab-nav-toggle-mark {
  position: relative;
}

.ab-nav-toggle-mark::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  inset-block-start: -7px;
}

html.js[data-ab-nav-open="true"],
html[data-ab-nav-open="true"] body {
  overflow: hidden;
}

@media (max-width: 920px) {
  .ab-nav-toggle {
    display: inline-flex;
  }

  .js .ab-primary-nav {
    position: fixed;
    inset: 0;
    z-index: 81;
    margin: 0;
    padding:
      calc(var(--ab-nav-height) + clamp(36px, 8vh, 72px))
      var(--ab-gutter)
      clamp(36px, 8vh, 72px);
    overflow-y: auto;
    background-color: var(--ab-bg);
    background-image: var(--ab-weather-wash), var(--ab-sky-wash), var(--ab-material);
    color: var(--ab-text);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity 220ms ease, transform 220ms ease, visibility 0s linear 220ms;
  }

  .js .ab-primary-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
    transition-delay: 0s;
  }

  .ab-primary-nav-list {
    min-block-size: calc(100dvh - var(--ab-nav-height) - clamp(72px, 16vh, 144px));
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-content: center;
    gap: clamp(12px, 2.8vh, 28px) clamp(24px, 7vw, 72px);
  }

  .ab-primary-nav a {
    justify-content: flex-start;
    min-block-size: 52px;
    padding: 4px 0;
    font-family: "Fraunces", Georgia, serif;
    font-size: clamp(28px, 5.6vw, 46px);
    font-weight: 450;
    line-height: 1.08;
  }

  .ab-primary-nav a::after {
    inset-block-end: 0;
  }

  .ab-nav-toggle[aria-expanded="true"] .ab-nav-toggle-mark {
    transform: rotate(45deg);
  }

  .ab-nav-toggle[aria-expanded="true"] .ab-nav-toggle-mark::before {
    inset-block-start: 0;
    transform: rotate(-90deg);
  }

  .no-js .ab-nav-frame {
    flex-wrap: wrap;
    padding-block: 14px;
  }

  .no-js .ab-nav-toggle {
    display: none;
  }

  .no-js .ab-primary-nav {
    flex: 1 0 100%;
    margin: 0;
  }

  .no-js .ab-primary-nav-list {
    min-block-size: 0;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-content: start;
  }

  .no-js .ab-primary-nav a {
    font-size: 18px;
  }
}

@media (max-width: 560px) {
  .ab-primary-nav-list,
  .no-js .ab-primary-nav-list {
    grid-template-columns: 1fr;
  }

  .js .ab-primary-nav {
    padding-inline: max(24px, var(--ab-gutter));
  }

  .ab-primary-nav a {
    font-size: clamp(30px, 9vw, 44px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .ab-primary-nav,
  .ab-primary-nav a,
  .ab-primary-nav a::after,
  .ab-nav-toggle-mark,
  .ab-nav-toggle-mark::before {
    transition: none !important;
  }
}

@media (forced-colors: active) {
  .ab-nav-shell,
  .js .ab-primary-nav {
    background: Canvas;
    color: CanvasText;
    border-color: CanvasText;
  }

  .ab-nav-brand,
  .ab-nav-toggle,
  .ab-primary-nav a {
    color: LinkText;
  }

  .ab-primary-nav a[aria-current="page"] {
    text-decoration: underline;
  }
}