/* ===========================================================
   STICKY NAV — backdrop blur
   =========================================================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(5, 6, 8, 0.72);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: var(--hairline);
  transition: background 0.4s var(--ease-out);
}
.nav__inner {
  max-width: var(--shell-wide);
  margin: 0 auto;
  padding: 0.85rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}
.nav__brand { display: flex; align-items: center; gap: 0.9rem; }
.nav__logo { height: 96px; width: auto; color: var(--ink-950); display: block; }
.nav__brand-sub {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-700);
  padding-left: 0.9rem;
  border-left: var(--hairline);
}
.nav__menu { display: flex; align-items: center; gap: clamp(1.25rem, 2.5vw, 2.4rem); }
.nav__link {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-800);
  transition: color 0.3s var(--ease-out);
  position: relative;
}
.nav__link:hover, .nav__link.is-active { color: var(--ink-950); }
.nav__link.is-active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -6px; height: 1px; background: var(--silver);
}
.nav__cta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-950);
  border: 1px solid var(--ink-500);
  border-radius: var(--radius);
  padding: 0.65em 1.1em;
  transition: border-color 0.35s var(--ease-out), color 0.35s var(--ease-out);
}
.nav__cta:hover { border-color: var(--silver); }

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 34px; height: 34px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav__toggle span {
  display: block; height: 1.5px; width: 22px; background: var(--ink-950);
  transition: transform 0.35s var(--ease-out), opacity 0.35s var(--ease-out);
}
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

@media (max-width: 920px) {
  .nav__logo { height: 72px; }
  .nav__toggle { display: flex; }
  .nav__menu {
    position: fixed;
    top: 0; right: 0;
    height: 100vh;
    width: min(80vw, 320px);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: var(--space-6);
    padding: 6rem var(--gutter) var(--gutter);
    background: var(--ink-100);
    border-left: var(--hairline);
    transform: translateX(100%);
    transition: transform 0.45s var(--ease-out);
  }
  .nav__menu.is-open { transform: translateX(0); }
  .nav__link { font-size: var(--text-sm); }
  .nav__cta { margin-top: var(--space-2); }
}

/* Mobile menu: full screen + service sub-links */
.nav__sub { display: none; }
@media (max-width: 920px) {
  .nav__menu { width: 100vw; border-left: 0; overflow-y: auto; gap: var(--space-5); }
  .nav__sub { display: flex; flex-direction: column; gap: .7rem; margin: -.4rem 0 .4rem; padding-left: .9rem; border-left: 1px solid var(--ink-300, #d4d6dc); }
  .nav__sub a { font-size: .95rem; color: var(--ink-600, #5b6070); text-decoration: none; letter-spacing: 0; }
  .nav__sub a:hover { color: var(--ink-900, #0d0e12); }
}