/* ══════════════════════════════════════════
   LINEIGE — NAVIGATION
══════════════════════════════════════════ */

nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 500;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--section-pad-x);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
  transition: background 0.4s ease, border-color 0.4s ease;
}

/* Scrolled state — slightly more opaque */
nav.scrolled {
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  box-shadow: var(--shadow-sm);
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--accent2);
  letter-spacing: -0.02em;
  cursor: none;
  transition: color 0.2s;
}
.nav-logo:hover { color: var(--acid); }

.nav-links {
  display: flex;
  gap: 2.2rem;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  cursor: none;
  position: relative;
  transition: color 0.2s;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--acid);
  transition: width 0.28s var(--ease-out-quint);
}
.nav-links a:hover,
.nav-links a.active { color: var(--snow); }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

.nav-right {
  display: flex;
  gap: 0.7rem;
  align-items: center;
}

/* Mobile hamburger */
.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 30px;
  cursor: none;
  padding: 4px;
}
.nav-burger span {
  display: block;
  height: 1.5px;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.3s var(--ease-out-quint), opacity 0.3s, width 0.3s;
  width: 100%;
}
.nav-burger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-burger.open span:nth-child(2) { opacity: 0; width: 0; }
.nav-burger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile drawer */
.nav-drawer {
  position: fixed;
  top: var(--nav-height);
  left: 0; right: 0;
  z-index: 490;
  background: color-mix(in srgb, var(--bg) 96%, transparent);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
  padding: 1.5rem var(--section-pad-x);
  transform: translateY(-110%);
  transition: transform 0.35s var(--ease-out-quint);
  display: none;
}
.nav-drawer.open {
  transform: translateY(0);
}
.drawer-links {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}
.drawer-links a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  cursor: none;
  transition: color 0.2s;
}
.drawer-links a:hover { color: var(--acid); }