/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: .95rem 0;
  transition: background .45s var(--ease-soft), box-shadow .45s;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; }
.nav-logo {
  font-family: var(--serif); font-weight: 400; font-size: 1.35rem;
  color: var(--on-dark); letter-spacing: .02em; transition: color .4s;
}
.nav-logo .mark { color: var(--gold); margin-right: .35rem; }
.nav-links { display: flex; align-items: center; gap: 2.2rem; list-style: none; }
.nav-links a {
  font: 500 .82rem var(--sans); letter-spacing: .14em; text-transform: uppercase;
  color: var(--on-dark-soft); transition: color .3s; position: relative;
}
.nav-links a:not(.nav-cta)::after {
  content: ""; position: absolute; left: 0; bottom: -5px;
  width: 100%; height: 1px; background: currentColor;
  transform: scaleX(0); transform-origin: right;
  transition: transform .4s var(--ease-out);
}
.nav-links a:not(.nav-cta):hover { color: var(--on-dark); }
.nav-links a:not(.nav-cta):hover::after { transform: scaleX(1); transform-origin: left; }
.nav-cta {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: .6rem 1.3rem; border-radius: 99px;
  border: 1.5px solid oklch(95.9% 0.008 79 / 0.35);
  color: var(--on-dark) !important; transition: all .35s var(--ease-out);
}
.nav-cta:hover { background: var(--gold); border-color: var(--gold); color: var(--band-deep) !important; }

.nav.scrolled {
  background: oklch(95.9% 0.008 79 / 0.85);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 oklch(24% 0.022 55 / 0.08);
}
/* backdrop-filter creates a containing block for position:fixed descendants —
   without this, the mobile dropdown panel collapses into the nav bar's own
   box instead of positioning against the viewport whenever it's opened while scrolled */
.nav.menu-open {
  backdrop-filter: none; -webkit-backdrop-filter: none;
}
.nav.scrolled .nav-logo { color: var(--ink); }
.nav.scrolled .nav-logo .mark { color: var(--accent); }
.nav.scrolled .nav-links a { color: var(--ink-soft); }
.nav.scrolled .nav-links a:not(.nav-cta):hover { color: var(--accent-deep); }
.nav.scrolled .nav-cta {
  color: var(--accent-deep) !important;
  border-color: oklch(45% 0.122 152 / 0.4);
}
.nav.scrolled .nav-cta:hover { background: var(--accent); border-color: var(--accent); color: var(--canvas) !important; }

.nav-hamburger { display: none; }

@media (max-width: 780px) {
  .nav-links { display: none; }
  .nav-hamburger {
    display: flex; flex-direction: column; gap: 5px;
    background: none; border: none; cursor: pointer; padding: .95rem;
  }
  .hamburger-bar {
    width: 22px; height: 1.5px; background: var(--on-dark); transition: all .3s;
  }
  .nav.scrolled .hamburger-bar { background: var(--ink); }
  .nav-links.open {
    display: flex; flex-direction: column; gap: 1.3rem;
    position: fixed; top: 0; left: 0; right: 0;
    min-height: clamp(300px, 38vh, 380px);
    /* top padding clears the nav bar's own height (logo/hamburger row) —
       without it, the first link sits underneath those controls, which
       paint above this panel (z-index: -1) and silently swallow the tap */
    padding: 5rem 0 1.8rem;
    background: var(--band);
    box-shadow: 0 24px 40px -20px oklch(20% 0.042 168 / 0.45);
    align-items: center; justify-content: center; z-index: -1;
  }
  .nav-links.open a {
    display: inline-flex; align-items: center; justify-content: center;
    min-height: 44px; padding: 0 .5rem;
    color: var(--on-dark); font-size: 1rem;
  }
  .nav-links.open .nav-cta {
    margin-top: .6rem; padding: .95rem 1.9rem;
  }

  /* .nav.scrolled ties in specificity with the rules below, so these must
     stay last: the dropdown panel is always on the dark band regardless of
     scroll position, and logo/links/hamburger must stay light to match it. */
  .nav.menu-open .nav-logo { color: var(--on-dark); }
  .nav.menu-open .nav-logo .mark { color: var(--gold); }
  .nav.menu-open .nav-links a { color: var(--on-dark); }
  .nav.menu-open .nav-cta { color: var(--on-dark) !important; border-color: oklch(95.9% 0.008 79 / 0.35); }
  .nav.menu-open .hamburger-bar { background: var(--on-dark); }
}