/* ============================================================
   SG SUPPLIERS — NAVIGATION
   ============================================================ */

/* ── NAV WRAPPER ─────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  height: var(--nav-height);
  background: var(--nav-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition:
    background var(--duration-slow) var(--ease-standard),
    box-shadow var(--duration-slow) var(--ease-standard),
    border-color var(--duration-slow) var(--ease-standard);
}
.nav.scrolled {
  background: var(--nav-bg-scrolled);
  box-shadow: 0 1px 40px rgba(4,25,46,0.5);
  border-bottom-color: rgba(255,255,255,0.04);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* ── LOGO ────────────────────────────────────── */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
  transition: opacity var(--duration-normal);
}
.nav-logo:hover { opacity: 0.9; }

.nav-logo-mark {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
}

.nav-logo-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.nav-logo-name {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--prim-white);
  line-height: 1;
  letter-spacing: -0.01em;
}
.nav-logo-sub {
  font-size: 10px;
  color: rgba(255,255,255,0.45);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  line-height: 1;
}

/* ── DESKTOP LINKS ───────────────────────────── */
.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-1);
}
@media (min-width: 768px) { .nav-links { display: flex; } }

.nav-link {
  position: relative;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: rgba(255,255,255,0.7);
  border-radius: var(--radius-sm);
  transition: color var(--duration-normal) var(--ease-standard);
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--color-brand-secondary);
  border-radius: 2px;
  transition: width var(--duration-normal) var(--ease-spring);
}
.nav-link:hover { color: var(--prim-white); }
.nav-link:hover::after { width: 60%; }
.nav-link.active { color: var(--prim-white); }
.nav-link.active::after { width: 60%; }

.nav-cta {
  margin-left: var(--space-4);
}

/* ── HAMBURGER ───────────────────────────────── */
.nav-hamburger {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  color: var(--prim-white);
  transition: background var(--duration-normal);
}
.nav-hamburger:hover { background: rgba(255,255,255,0.08); }
@media (min-width: 768px) { .nav-hamburger { display: none; } }

.hamburger-lines {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 22px;
}
.hamburger-line {
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transform-origin: center;
  transition:
    transform var(--duration-normal) var(--ease-standard),
    opacity var(--duration-normal) var(--ease-standard),
    width var(--duration-normal) var(--ease-standard);
}
.nav-hamburger[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-hamburger[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0; transform: scaleX(0);
}
.nav-hamburger[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── MOBILE DRAWER ───────────────────────────── */
.nav-drawer {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(4,25,46,0.97);
  backdrop-filter: blur(20px);
  z-index: calc(var(--z-nav) - 1);
  display: flex;
  flex-direction: column;
  padding: var(--space-8) var(--space-6);
  gap: var(--space-4);
  transform: translateX(100%);
  transition: transform var(--duration-slow) var(--ease-standard);
}
.nav-drawer.open { transform: translateX(0); }
@media (min-width: 768px) { .nav-drawer { display: none; } }

.nav-drawer-link {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 400;
  color: rgba(255,255,255,0.7);
  padding: var(--space-3) 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition:
    color var(--duration-normal),
    transform var(--duration-normal) var(--ease-spring);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-drawer-link:hover {
  color: var(--prim-white);
  transform: translateX(8px);
}
.nav-drawer-link svg { opacity: 0.4; }

.nav-drawer-cta {
  margin-top: var(--space-6);
}

/* ── PROGRESS BAR ────────────────────────────── */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--prim-sky-500), var(--prim-sky-300));
  z-index: calc(var(--z-nav) + 1);
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 50ms linear;
}