/* ============================================================
   VERDANTIS — persistent civic interface / navigation
   BUILD 029: closed INDEX must not cover the document.
   BUILD 028 behaviour preserved when INDEX is open.
   ============================================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: nowrap;
  height: var(--header-h);
  padding: 0 var(--gutter);
  background: linear-gradient(to bottom, rgba(4, 8, 12, 0.72), rgba(4, 8, 12, 0));
  transition: background var(--duration) var(--ease-out), border-color var(--duration) var(--ease-out);
}

.site-header.is-scrolled {
  background: rgba(6, 14, 18, 0.78);
  border-bottom: 1px solid var(--hairline);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  min-height: 2.5rem;
  position: relative;
  z-index: 80;
}

.brand-mark {
  display: block;
  width: auto;
  height: clamp(1.85rem, 4vw, 2.35rem);
  flex-shrink: 0;
  object-fit: contain;
  filter: drop-shadow(0 1px 5px rgba(4, 8, 12, 0.32));
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  white-space: nowrap;
}

.brand:hover .brand-name,
.brand:focus-visible .brand-name {
  color: var(--interior);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 2.75rem;
  min-width: 2.75rem;
  padding: 0 0.35rem;
  margin-left: auto;
  flex-shrink: 0;
  z-index: 80;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink);
  text-shadow: 0 1px 10px rgba(4, 8, 12, 0.7);
  transition: color var(--duration) var(--ease-out);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  color: var(--interior);
}

.site-nav {
  display: flex;
  flex-direction: column;
  position: fixed;
  inset: 0;
  z-index: 55;
  margin: 0;
  padding: calc(var(--header-h) + 1.75rem) var(--gutter) 2.75rem;
  background: #070c10;
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translate3d(0, 10px, 0);
  transition:
    opacity var(--duration) var(--ease-out),
    transform var(--duration) var(--ease-out),
    visibility var(--duration) var(--ease-out);
}

/* Closed overlay must not cover the document or participate in layout/IO. */
.site-nav:not(.is-open) {
  inset: auto;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  min-width: 0;
  min-height: 0;
  padding: 0;
  overflow: hidden;
  content-visibility: hidden;
}

.site-nav.is-open {
  inset: 0;
  width: auto;
  height: auto;
  padding: calc(var(--header-h) + 1.75rem) var(--gutter) 2.75rem;
  overflow-x: hidden;
  overflow-y: auto;
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: none;
  content-visibility: visible;
}

html.is-nav-open,
html.is-nav-open body {
  overflow: hidden;
}

html.is-nav-open .site-header,
html.is-nav-open .site-header:not(.is-scrolled),
html.is-nav-open .site-header.is-scrolled {
  background: #070c10;
  border-bottom: 1px solid var(--hairline);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  transform: none;
  filter: none;
}

html.reduce-motion .site-nav {
  transform: none;
  transition: none;
}

.site-nav ul {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 2.85rem;
  padding: 0.95rem 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-muted);
  border-bottom: 1px solid var(--hairline);
  transition: color var(--duration) var(--ease-out);
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0.15rem;
  height: 1px;
  background: var(--amber);
  transition: right var(--duration) var(--ease-out);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--ink);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after,
.site-nav a[aria-current="page"]::after {
  right: 0;
}

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

.header-meta {
  display: none;
}

@media (max-width: 720px) {
  .brand {
    gap: 0.65rem;
  }
}

/*
  PHONE NAV stays INDEX-based:
  - portrait: existing full-screen overlay
  - landscape: compact header panel (this block + html.is-phone-landscape-nav)

  Phone landscape = short landscape viewport, or width still below full-nav.
  html.is-phone-landscape-nav covers iOS when overflow-lock freezes media queries.
*/
@media (orientation: landscape) and (max-height: 499px),
       (max-width: 860px) and (orientation: landscape) {
  .site-nav.is-open {
    inset: auto;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: auto;
    width: auto;
    height: auto;
    max-height: calc(100dvh - var(--header-h));
    max-height: calc(100svh - var(--header-h));
    padding: 0.15rem max(var(--gutter), env(safe-area-inset-right)) 0.85rem max(var(--gutter), env(safe-area-inset-left));
    overflow-x: hidden;
    overflow-y: auto;
    border-bottom: 1px solid var(--hairline);
    box-shadow: 0 18px 36px rgba(4, 8, 12, 0.38);
  }

  .site-nav.is-open ul {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: clamp(1.4rem, 5vw, 3rem);
    align-items: stretch;
  }

  .site-nav.is-open a {
    min-height: 2.45rem;
    padding: 0.55rem 0;
    font-size: 0.8rem;
    letter-spacing: 0.18em;
  }
}

html.is-phone-landscape-nav .site-nav.is-open {
  inset: auto;
  top: var(--header-h);
  left: 0;
  right: 0;
  bottom: auto;
  width: auto;
  height: auto;
  max-height: calc(100dvh - var(--header-h));
  max-height: calc(100svh - var(--header-h));
  padding: 0.15rem max(var(--gutter), env(safe-area-inset-right)) 0.85rem max(var(--gutter), env(safe-area-inset-left));
  overflow-x: hidden;
  overflow-y: auto;
  border-bottom: 1px solid var(--hairline);
  box-shadow: 0 18px 36px rgba(4, 8, 12, 0.38);
}

html.is-phone-landscape-nav .site-nav.is-open ul {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: clamp(1.4rem, 5vw, 3rem);
  align-items: stretch;
}

html.is-phone-landscape-nav .site-nav.is-open a {
  min-height: 2.45rem;
  padding: 0.55rem 0;
  font-size: 0.8rem;
  letter-spacing: 0.18em;
}

/* FULL NAV: tablet / iPad landscape and desktop. Not phone landscape. */
@media (min-width: 861px) and (min-height: 500px) {
  .brand-name {
    font-size: 1.2rem;
    letter-spacing: 0.34em;
  }

  .nav-toggle {
    display: none;
  }

  .site-nav,
  .site-nav:not(.is-open),
  .site-nav.is-open {
    display: block;
    position: static;
    inset: auto;
    z-index: auto;
    top: auto;
    right: auto;
    width: auto;
    height: auto;
    min-width: 0;
    min-height: 0;
    margin-left: auto;
    padding: 0;
    background: none;
    overflow: visible;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
    transition: none;
    content-visibility: visible;
  }

  .site-nav.is-open {
    opacity: 1;
    visibility: visible;
  }

  html.is-nav-open,
  html.is-nav-open body {
    overflow: auto;
  }

  html.is-nav-open .site-header {
    background: linear-gradient(to bottom, rgba(4, 8, 12, 0.72), rgba(4, 8, 12, 0));
    border-bottom: 0;
  }

  html.is-nav-open .site-header.is-scrolled {
    background: rgba(6, 14, 18, 0.78);
    border-bottom: 1px solid var(--hairline);
  }

  .site-nav ul {
    flex-direction: row;
    gap: clamp(1rem, 2vw, 2.1rem);
  }

  .site-nav a {
    display: inline-block;
    min-height: 0;
    padding: 0.4rem 0;
    font-size: 0.68rem;
    border-bottom: 0;
  }
}

@media (min-width: 1100px) {
  .site-header {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    justify-content: initial;
  }

  .site-nav,
  .site-nav:not(.is-open),
  .site-nav.is-open {
    margin-left: 0;
    justify-self: center;
  }

  .header-meta {
    display: flex;
    justify-self: end;
    align-items: center;
    gap: 1.25rem;
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--ink-faint);
  }

  .header-meta .pulse {
    width: 0.4rem;
    height: 0.4rem;
    border-radius: 50%;
    background: var(--emerald);
    box-shadow: 0 0 8px var(--emerald-glow);
    animation: live-pulse 3.6s var(--ease-in-out) infinite;
  }
}

@keyframes live-pulse {
  0%, 100% { opacity: 0.45; transform: scale(0.85); }
  50% { opacity: 1; transform: scale(1); }
}

@media (prefers-reduced-motion: reduce) {
  .site-nav,
  html.reduce-motion .site-nav {
    transform: none;
    transition: none;
  }

  .header-meta .pulse,
  html.reduce-motion .header-meta .pulse {
    animation: none;
    opacity: 0.8;
  }
}