/* ============================================================
   NAVIGATION — Sticky + Dropdown + Mobile
   ============================================================ */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(0,0,0,0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  max-width: 1280px;
  height: 100%;
  margin: 0 auto;
  padding: 0 5%;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 2.5rem;
}
/* Push hamburger toggle to the far right when nav-menu is hidden behind it */
.nav-toggle { margin-left: auto; }

.nav-logo { display: flex; align-items: center; }
.nav-logo img {
  height: 72px;          /* fills the entire 72px nav height edge-to-edge */
  max-height: 72px;
  width: auto;
  display: block;
  transition: var(--transition);
}
@media (max-width: 720px) {
  .nav-logo img { height: 60px; max-height: 60px; }
}
.nav-logo:hover img { filter: drop-shadow(0 0 8px var(--color-accent)); }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav-menu > li { position: relative; }

.nav-menu > li > a,
.nav-menu > li > button {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  white-space: nowrap;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text);
  padding: 0.65rem 0.75rem;
  border-radius: var(--border-radius);
  transition: var(--transition);
  position: relative;
  background: transparent;
}

.nav-menu > li > a:hover,
.nav-menu > li > button:hover,
.nav-menu > li.has-dropdown:hover > button { color: var(--color-accent); }

.nav-menu > li > a.active::after {
  content: '';
  position: absolute;
  left: 1rem;
  right: 1rem;
  bottom: 4px;
  height: 2px;
  background: var(--color-accent);
  box-shadow: var(--glow-accent);
}

.nav-menu .caret {
  font-size: 0.7rem;
  transition: transform var(--transition);
}
.nav-menu .has-dropdown:hover .caret,
.nav-menu .has-dropdown.open .caret { transform: rotate(180deg); }

/* Dropdown */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 280px;
  background: rgba(8,8,8,0.98);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 0.5rem;
  margin-top: 0.5rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  box-shadow: 0 10px 40px rgba(0,0,0,0.8), 0 0 0 1px rgba(0,200,255,0.05);
}
.has-dropdown:hover .nav-dropdown,
.has-dropdown.open .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-dropdown a {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  padding: 0.7rem 1rem;
  border-radius: 4px;
  transition: var(--transition);
}
.nav-dropdown a:hover {
  background: rgba(0,200,255,0.08);
  color: var(--color-accent);
  padding-left: 1.25rem;
}

/* Mobile hamburger */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  cursor: pointer;
  z-index: 1002;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   MOBILE NAV — authoritative full-screen overlay
   (single source of truth; loads after style.css so it wins)
   ============================================================ */
@media (max-width: 992px) {
  .nav-toggle { display: inline-flex; position: relative; z-index: 1205; }

  /* When the menu is open, lift the whole nav (and its full-screen
     menu child) ABOVE the topbar so the overlay covers everything.
     This fixes the stacking trap where the topbar (z 1001) showed
     on top of the menu. */
  body.menu-open .site-nav {
    z-index: 1200;
    background: transparent !important;
    border-bottom-color: transparent;
  }
  body.menu-open .topbar   { opacity: 0; pointer-events: none; transition: opacity 0.2s ease; }
  body.menu-open .nav-logo { opacity: 0; pointer-events: none; }

  .nav-menu {
    position: fixed;
    inset: 0;
    width: 100%;
    max-width: 100%;
    height: 100vh;
    height: 100dvh;
    margin: 0;
    background:
      radial-gradient(ellipse 80% 60% at 50% 25%, rgba(0,200,255,0.10) 0%, transparent 60%),
      #050505;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: calc(var(--topbar-height) + var(--nav-height) + 1.25rem) 1.75rem 2rem;
    transform: translateX(100%);
    transition: transform 0.35s ease;
    overflow-y: auto;
    z-index: 1100;
    border: none;
  }
  .nav-menu.open { transform: translateX(0); }

  .nav-menu > li { width: 100%; border-bottom: 1px solid var(--color-border); }
  .nav-menu > li > a,
  .nav-menu > li > button {
    width: 100%;
    justify-content: space-between;
    padding: 1.15rem 0.25rem;
    border-radius: 0;
    font-size: 1.05rem;
    color: #fff;
  }

  .nav-dropdown {
    position: static;
    width: 100%;
    background: transparent;
    border: none;
    box-shadow: none;
    margin: 0;
    padding: 0 0 0.5rem 1rem;
    opacity: 0;
    visibility: hidden;
    max-height: 0;
    overflow: hidden;
    transform: none;
    transition: max-height 0.3s ease, opacity 0.3s ease, visibility 0.3s;
  }
  .has-dropdown:hover .nav-dropdown { opacity: 0; visibility: hidden; max-height: 0; }
  .has-dropdown.open .nav-dropdown { opacity: 1; visibility: visible; max-height: 800px; }
  .nav-dropdown a { padding: 0.65rem 0.5rem; font-size: 0.85rem; color: var(--color-text-muted); }

  /* X close button pinned top-right, above the open menu */
  body.menu-open .nav-toggle {
    position: fixed;
    top: calc(var(--topbar-height) + (var(--nav-height) - 40px) / 2);
    right: 5%;
    z-index: 1205;
    background: rgba(0,0,0,0.5);
  }
}

@media (max-width: 600px) {
  .nav-menu { padding-top: calc(var(--topbar-height) + var(--nav-height) + 1rem); }
  .nav-menu > li > a,
  .nav-menu > li > button { font-size: 1rem; }
}

/* Prevent body scroll when mobile menu open */
body.menu-open { overflow: hidden; }

/* Mobile backdrop */
.nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}
.nav-backdrop.active { opacity: 1; visibility: visible; }