/* ============================================================
   NAV.CSS — Navigation styles
   ============================================================ */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 900;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background 0.3s, border-color 0.3s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(0,0,0,0.96);
  border-bottom-color: var(--grey-3);
  backdrop-filter: blur(12px);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

/* Brand */
.nav-brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo {
  font-family: var(--ff-display);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.01em;
  line-height: 1;
}
.nav-tagline {
  font-family: var(--ff-mono);
  font-size: 0.55rem;
  color: var(--grey-5);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  line-height: 1;
}

/* Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  font-family: var(--ff-mono);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--grey-6);
  transition: color 0.2s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--white); }

/* CTA */
.nav-cta {
  font-family: var(--ff-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--white);
  background: var(--accent);
  border: none;
  padding: 10px 22px;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  white-space: nowrap;
  text-decoration: none;
  display: inline-block;
}
.nav-cta:hover {
  background: var(--accent-dim);
  transform: translateY(-1px);
}

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  cursor: pointer;
  background: none;
  border: none;
  z-index: 1001;
}
.nav-hamburger span {
  display: block;
  width: 24px; height: 1.5px;
  background: var(--white);
  transition: transform 0.3s, opacity 0.3s;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile drawer */
.nav-drawer {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 800;
  background: var(--black);
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: calc(var(--nav-h) + 40px) var(--pad-x) 60px;
  gap: 8px;
}
.nav-drawer.open { display: flex; }
.nav-drawer a {
  font-family: var(--ff-display);
  font-size: clamp(2rem, 8vw, 3.2rem);
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.02em;
  padding: 8px 0;
  border-bottom: 1px solid var(--grey-3);
  width: 100%;
  transition: color 0.2s;
}
.nav-drawer a:hover { color: var(--accent); }
.nav-drawer .nav-drawer-cta {
  margin-top: 32px;
  font-family: var(--ff-mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  background: var(--accent);
  color: var(--white);
  padding: 14px 28px;
  font-weight: 500;
  border-bottom: none;
  width: auto;
}

@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-cta { display: none; }
  .nav-hamburger { display: flex; }
}
@media (max-width: 640px) {
  .nav-inner { padding: 0 var(--pad-x-sm); }
  .nav-drawer { padding: calc(var(--nav-h) + 32px) var(--pad-x-sm) 40px; }
}