/* ========================================================================== Nav */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  border-bottom: 1px solid transparent;
  background: transparent;
  transition: background var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease),
              backdrop-filter var(--dur-2) var(--ease);
}
/* The bar only materialises after the first viewport. */
.nav.is-stuck {
  background: rgba(8, 9, 12, .72);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--hairline-2);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-6);
  min-height: 72px;
}

.nav-brand { display: flex; align-items: center; gap: var(--s-3); }
.nav-word {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--step--1);
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--text-1);
}
/* The mark is the shaft seen end-on: a gold hairline. */
.nav-mark {
  width: 2px; height: 22px;
  background: var(--gold-500);
  box-shadow: 0 0 12px rgba(229,180,95,.6);
}

.nav-links { display: flex; gap: var(--s-8); }
.nav-links a {
  position: relative;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-2);
  padding-block: var(--s-2);
  transition: color var(--dur-1) var(--ease);
}
.nav-links a:hover { color: var(--text-1); }
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: var(--gold-500);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--dur-2) var(--ease);
}
.nav-links a:hover::after { transform: scaleX(1); transform-origin: left; }

.nav-actions { display: flex; align-items: center; gap: var(--s-4); }
.nav-cta { min-height: 40px; padding-inline: var(--s-6); }

.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 1px;
  background: var(--text-1);
  transition: transform var(--dur-2) var(--ease), opacity var(--dur-1) var(--ease);
}
.nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child  { transform: translateY(-3.5px) rotate(-45deg); }

/* Scroll progress — a gold filament, the shaft abstracted. */
.nav-progress {
  height: 1px;
  background: var(--gold-500);
  transform: scaleX(var(--progress, 0));
  transform-origin: left;
  will-change: transform;
}

@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .nav-cta { display: none; }

  .nav-links {
    position: fixed;
    inset: 72px 0 auto 0;
    flex-direction: column;
    gap: 0;
    padding: var(--s-4) var(--gutter) var(--s-8);
    background: rgba(8, 9, 12, .97);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--hairline-2);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--dur-2) var(--ease), transform var(--dur-2) var(--ease), visibility var(--dur-2);
  }
  .nav-links.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav-links a { padding-block: var(--s-4); border-bottom: 1px solid var(--hairline-2); font-size: var(--step-0); }
  .nav-links a::after { display: none; }
}