/* =========================================================
   NAVIGATION.CSS — Minimal topbar + fullscreen overlay menu
========================================================= */

.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 60;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: clamp(0.85rem, 1.9vw, 1.35rem) var(--edge);
  mix-blend-mode: normal;
  transition: transform .5s var(--ease-out), background .4s ease, border-color .4s ease;
  border-bottom: 1px solid transparent;
}
.topbar__logo { grid-column: 1; justify-self: start; }
.topbar__actions { grid-column: 3; justify-self: end; }
.topbar.is-scrolled {
  background: rgba(5, 7, 11, 0.72);
  backdrop-filter: blur(14px);
  border-color: var(--line);
}
.topbar.is-hidden { transform: translateY(-110%); }

.topbar__logo {
  display: flex;
  align-items: center;
}
.topbar__logo-img {
  height: clamp(36px, 5vw, 56px);
  width: auto;
  display: block;
}

.topbar__quicknav {
  display: none;
  align-items: center;
  gap: clamp(1.25rem, 2vw, 2rem);
}
@media (min-width: 1080px) {
  .topbar__quicknav { display: flex; }
}
.topbar__quicknav-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
  white-space: nowrap;
  padding-block: .3rem;
  border-bottom: 1px solid transparent;
  transition: color .3s ease, border-color .3s ease;
}
.topbar__quicknav-link:hover,
.topbar__quicknav-link:focus-visible,
.topbar__quicknav-link.is-current { color: var(--bone); border-color: var(--sky); }

.topbar__actions {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 1.75rem);
}

/* Small, deliberately understated relative to the site's big .btn
   component — this lives in a slim persistent bar, not a hero, so it
   should read as "always there" rather than shout on every page. */
.topbar__cta {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sky);
  border: 1px solid var(--sky);
  padding: .5rem 1.05rem;
  border-radius: 999px;
  transition: background .35s ease, color .35s ease, border-color .35s ease;
  white-space: nowrap;
}
.topbar__cta:hover,
.topbar__cta:focus-visible {
  background: var(--sky);
  color: white;
  border-color: var(--sky);
}

.topbar__trigger {
  display: flex;
  align-items: center;
  gap: .9rem;
  color: var(--bone);
}
.topbar__trigger-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.topbar__trigger-icon {
  width: 26px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.topbar__trigger-icon span {
  height: 1px;
  background: var(--bone);
  transition: transform .4s var(--ease-in-out), opacity .3s ease, width .3s ease;
}
.topbar__trigger-icon span:last-child { width: 65%; margin-left: auto; }
[data-nav-trigger][aria-expanded="true"] .topbar__trigger-icon span:first-child {
  transform: translateY(3.5px) rotate(45deg);
  width: 100%;
}
[data-nav-trigger][aria-expanded="true"] .topbar__trigger-icon span:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
  width: 100%;
}

/* ---------------------------------------------------------
   Fullscreen overlay
--------------------------------------------------------- */
.site-nav {
  position: fixed;
  inset: 0;
  z-index: 55;
  background: var(--void);
  visibility: hidden;
  opacity: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  transition: opacity .6s var(--ease-in-out), visibility 0s linear .6s;
}
.site-nav.is-open {
  visibility: visible;
  opacity: 1;
  transition: opacity .6s var(--ease-in-out), visibility 0s linear 0s;
}

.site-nav__grid {
  position: relative;
  min-height: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.7fr);
  gap: clamp(2rem, 6vw, 6rem);
  padding: clamp(6.5rem, 13vh, 9rem) var(--edge) clamp(3rem, 6vh, 4rem);
  align-content: center;
}
/* When the list (with submenus open) is taller than the viewport, drop the
   forced centering so nothing gets clipped above the fold — it simply
   flows from the top and the container above already handles scrolling. */
.site-nav.is-tall .site-nav__grid { align-content: start; }

.site-nav__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist-dim);
  display: block;
  margin-bottom: clamp(1.5rem, 3vh, 2.5rem);
}

.site-nav__list-wrap { align-self: center; }

.site-nav__item { border-top: 1px solid var(--line); }
.site-nav__item:last-child { border-bottom: 1px solid var(--line); }

.site-nav__row {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.site-nav__row .site-nav__link { flex: 1; }

.site-nav__link {
  display: flex;
  align-items: baseline;
  gap: clamp(1rem, 3vw, 2.5rem);
  padding: clamp(.85rem, 2vh, 1.4rem) 0;
  transition: padding-left .5s var(--ease-out);
}
.site-nav__link:hover,
.site-nav__link:focus-visible { padding-left: 1.25rem; }

/* ---- expand toggle for items with nested editions ---- */
.site-nav__expand {
  flex-shrink: 0;
  width: 40px; height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.site-nav__expand span {
  position: relative;
  width: 14px; height: 14px;
}
.site-nav__expand span::before,
.site-nav__expand span::after {
  content: '';
  position: absolute;
  background: var(--mist);
  transition: transform .4s var(--ease-out), background .3s ease;
}
.site-nav__expand span::before { left: 0; top: 50%; width: 100%; height: 1px; transform: translateY(-50%); }
.site-nav__expand span::after  { top: 0; left: 50%; width: 1px; height: 100%; transform: translateX(-50%); }
.site-nav__expand:hover span::before,
.site-nav__expand:hover span::after { background: var(--sky); }
.site-nav__expand[aria-expanded="true"] span::after { transform: translateX(-50%) scaleY(0); }
.site-nav__expand[aria-expanded="true"] span::before { background: var(--sky); }

.site-nav__sublist {
  max-height: 0;
  overflow: hidden;
  transition: max-height .5s var(--ease-out);
  padding-left: clamp(1.5rem, 4vw, 3.5rem);
}
.site-nav__sublist.is-expanded { max-height: 220px; }
.site-nav__sublist li { border-top: 1px solid var(--line); }
.site-nav__sublist li:first-child { border-top: none; }
.site-nav__sublist a {
  display: block;
  padding: .9rem 0;
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  color: var(--mist);
  transition: color .3s ease, padding-left .4s var(--ease-out);
}
.site-nav__sublist a:hover,
.site-nav__sublist a:focus-visible { color: var(--sky-bright); padding-left: .75rem; }

.site-nav__link-index {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--mist-dim);
  transition: color .4s ease;
}
.site-nav__link:hover .site-nav__link-index,
.site-nav__link:focus-visible .site-nav__link-index { color: var(--sky); }

.site-nav__link-title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4.2vw, 3.1rem);
  color: var(--bone);
  display: block;
  transition: color .4s ease;
}
.site-nav__link:hover .site-nav__link-title,
.site-nav__link:focus-visible .site-nav__link-title { color: var(--sky-bright); }
.site-nav__link.is-current .site-nav__link-title { color: var(--sky); font-style: italic; }

.site-nav__link-sub {
  display: block;
  font-size: 0.85rem;
  color: var(--mist-dim);
  margin-top: .2rem;
}

.site-nav__aside {
  align-self: center;
  border-left: 1px solid var(--line);
  padding-left: clamp(1.5rem, 3vw, 3rem);
  display: none;
}
.site-nav__note { color: var(--mist); font-size: .95rem; line-height: 1.6; margin-bottom: 1.5rem; }
.site-nav__cta {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.3rem;
  color: var(--sky);
  border-bottom: 1px solid var(--sky-deep);
  padding-bottom: .3rem;
}
.site-nav__meta {
  margin-top: clamp(2rem, 5vh, 4rem);
  display: flex;
  flex-direction: column;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--mist-dim);
}

@media (min-width: 900px) {
  .site-nav__aside { display: block; }
}

body.nav-open { overflow: hidden; }