/* =========================================================
   NAVIGATION BAR (Flexbox)
   ========================================================= */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: transparent;
}

/* Keep the glass layer separate so the mobile menu stays viewport-sized. */
.nav::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: rgba(19, 19, 19, 0.92);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.nav.is-scrolled::before {
  opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
  .nav::before { transition: none; }
}

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

.nav__logo {
  font-size: var(--text-lg);
  font-weight: var(--font-headline);
  letter-spacing: var(--tracking-tight);
  color: var(--on-surface);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__logo .accent-dot,
.nav__logo span:first-of-type {
  color: var(--primary-container);
}

.nav__tagline {
  font-size: var(--text-xs);
  font-weight: var(--font-label);
  letter-spacing: var(--tracking-wider);
  color: var(--on-surface-variant);
  opacity: 0.75;
  margin-left: var(--space-2);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: var(--font-label);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--on-surface-variant);
  transition: color var(--transition-base);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-container);
  transition: width var(--transition-base);
  border-radius: var(--radius-pill);
}

.nav__link:hover,
.nav__link.active {
  color: var(--on-surface);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

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

/* ── Mobile Hamburger Toggle ── */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  cursor: pointer;
  z-index: 1001;
  position: relative;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--on-surface);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav__toggle.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.nav__toggle.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Navigation Responsive (max-width: 768px) ── */
@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100dvh;
    background: var(--surface-container-highest);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-10);
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 1000;
  }

  .nav__links.is-open {
    transform: translateX(0);
  }

  .nav__link {
    font-size: var(--text-2xl);
  }

  .nav__cta {
    margin-left: 0;
  }
}