/* ==========================================================================
   nav.css — fixed header, scroll progress hairline, mobile overlay menu.
   ========================================================================== */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background var(--d-mid) var(--e-out), backdrop-filter var(--d-mid) var(--e-out);
}

.nav.is-stuck {
  background: rgba(26, 20, 13, 0.72);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid rgba(243, 236, 221, 0.09);
}

/* Over daylight sections the bar inverts so the wordmark stays legible. */
.nav.is-stuck.on-husk {
  background: rgba(239, 232, 216, 0.78);
  border-bottom-color: rgba(43, 33, 20, 0.14);
  color: var(--t-husk);
}
.nav.on-husk .nav__mark--light { opacity: 0; }
.nav.on-husk .nav__mark--dark { opacity: 1; }

.nav__inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-5);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  flex: none;
}

.nav__marks { position: relative; width: 30px; height: 30px; flex: none; }
.nav__marks img {
  position: absolute;
  inset: 0;
  width: 30px; height: 30px;
  object-fit: contain;
  transition: opacity var(--d-mid) var(--e-out);
}
.nav__mark--dark { opacity: 0; }

.nav__word {
  display: grid;
  line-height: 1.05;
}
.nav__word b {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}
.nav__word span {
  font-family: var(--f-mono);
  font-size: 0.56rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  opacity: 0.55;
}

.nav__links {
  display: none;
  align-items: center;
  gap: clamp(0.8rem, 1.7vw, 1.7rem);
}

@media (min-width: 1160px) { .nav__links { display: flex; } }

.nav__link {
  position: relative;
  font-size: var(--fs-sm);
  font-weight: 300;
  padding-block: var(--s-2);
  opacity: 0.78;
  transition: opacity var(--d-fast) var(--e-out);
}

.nav__link::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--d-mid) var(--e-out);
}

.nav__link:hover { opacity: 1; }
.nav__link:hover::after,
.nav__link.is-current::after { transform: scaleX(1); transform-origin: left; }
.nav__link.is-current { opacity: 1; }

.nav__cta { display: none; }
@media (min-width: 640px) { .nav__cta { display: inline-flex; } }

/* Scroll progress — a hairline that fills as the page is read. */
.nav__progress {
  position: absolute;
  left: 0; bottom: 0;
  height: 1.5px;
  width: 100%;
  transform: scaleX(var(--progress, 0));
  transform-origin: left;
  background: linear-gradient(90deg, var(--c-capital), var(--c-land), var(--c-table));
  opacity: 0;
  transition: opacity var(--d-mid) var(--e-out);
}
.nav.is-stuck .nav__progress { opacity: 1; }

/* --- Burger --------------------------------------------------------------- */

.burger {
  --burger-size: 20px;
  display: grid;
  gap: 5px;
  width: 30px;
  padding: var(--s-2) 0;
}
@media (min-width: 1160px) { .burger { display: none; } }

.burger span {
  display: block;
  height: 1.5px;
  width: var(--burger-size);
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--d-mid) var(--e-spring), opacity var(--d-fast) var(--e-out), width var(--d-mid) var(--e-out);
  margin-left: auto;
}
.burger span:nth-child(2) { width: 13px; }

.burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; width: 20px; }
.burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* --- Overlay menu --------------------------------------------------------- */

.menu {
  position: fixed;
  inset: 0;
  z-index: 95;
  background: var(--c-night);
  display: grid;
  align-content: center;
  padding: var(--nav-h) var(--gutter) var(--s-8);
  clip-path: circle(0% at calc(100% - 3rem) 2.4rem);
  transition: clip-path 720ms var(--e-out);
  pointer-events: none;
}

.menu.is-open {
  clip-path: circle(150% at calc(100% - 3rem) 2.4rem);
  pointer-events: auto;
}

.menu__list { display: grid; gap: var(--s-2); max-width: var(--shell); margin-inline: auto; width: 100%; }

.menu__item {
  opacity: 0;
  transform: translate3d(0, 26px, 0);
  transition: opacity 520ms var(--e-out), transform 520ms var(--e-out);
}
.menu.is-open .menu__item { opacity: 1; transform: none; }

.menu__link {
  display: flex;
  align-items: baseline;
  gap: var(--s-4);
  padding-block: var(--s-3);
  font-family: var(--f-display);
  font-size: clamp(2rem, 9vw, 3.4rem);
  font-weight: 300;
  line-height: 1.1;
  border-bottom: 1px solid var(--line-night);
  transition: color var(--d-fast) var(--e-out), padding-left var(--d-mid) var(--e-out);
}
.menu__link:hover { color: var(--c-kunyit); padding-left: var(--s-3); }

.menu__link i {
  font-family: var(--f-mono);
  font-size: 0.68rem;
  font-style: normal;
  letter-spacing: 0.12em;
  opacity: 0.42;
}

.menu__foot {
  margin-top: var(--s-7);
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-4) var(--s-6);
  color: var(--t-night-faint);
  max-width: var(--shell);
  margin-inline: auto;
  width: 100%;
}