/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--sp-6) var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-8);
  transition: background var(--dur-mid) var(--ease-in-out),
              padding var(--dur-mid) var(--ease-in-out),
              box-shadow var(--dur-mid) var(--ease-in-out);
}
.nav.scrolled {
  background: rgba(8,8,15,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding-block: var(--sp-4);
  box-shadow: 0 1px 0 var(--clr-border);
}

/* Logo */
.nav__logo {
  font-family: var(--font-display);
  font-size: var(--size-xl);
  font-weight: 800;
  color: var(--clr-text-primary);
  letter-spacing: -0.02em;
  transition: color var(--dur-fast);
  flex-shrink: 0;
}
.nav__logo span { color: var(--clr-accent); }
.nav__logo:hover { color: var(--clr-accent); }

/* Links */
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}
.nav__link {
  font-family: var(--font-body);
  font-size: var(--size-sm);
  font-weight: 500;
  color: var(--clr-text-secondary);
  transition: color var(--dur-fast);
  position: relative;
}
.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--clr-accent);
  transition: width var(--dur-mid) var(--ease-out-expo);
}
.nav__link:hover { color: var(--clr-text-primary); }
.nav__link:hover::after { width: 100%; }

.nav__cta { font-size: var(--size-sm); padding: 10px var(--sp-6); }

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  cursor: pointer;
}
.nav__hamburger span {
  display: block;
  height: 2px;
  background: var(--clr-text-primary);
  border-radius: 2px;
  transition: all var(--dur-mid) var(--ease-out-expo);
}
.nav__hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__hamburger.open span:nth-child(2) { opacity: 0; }
.nav__hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.nav__mobile {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(8,8,15,0.97);
  backdrop-filter: blur(20px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-8);
  padding: var(--sp-16);
  opacity: 0;
  transition: opacity var(--dur-mid);
}
.nav__mobile.open { opacity: 1; }
.nav__mobile .nav__link {
  font-size: var(--size-3xl);
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--clr-text-primary);
}

@media (max-width: 900px) {
  .nav__links, .nav__cta { display: none; }
  .nav__hamburger { display: flex; }
  .nav__mobile { display: flex; }
}