/* ============================================================
   nav.css — Sticky glassmorphism navigation
   ============================================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  padding-block: 1.125rem;
  transition:
    background-color var(--duration-base) var(--ease-in-out),
    backdrop-filter var(--duration-base) var(--ease-in-out),
    border-color var(--duration-base) var(--ease-in-out),
    padding-block var(--duration-base) var(--ease-in-out);
  border-bottom: 1px solid transparent;
}

/* State: once JS adds .nav--scrolled */
.nav--scrolled {
  background-color: var(--glass-nav-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom-color: var(--glass-nav-border);
  padding-block: 0.875rem;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

/* ── Logo ──────────────────────────────────────────────────── */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
  text-decoration: none;
}

.nav__logo-img {
  height: 32px;
  width: auto;
  display: block;
  filter: brightness(0) invert(1);
  transition: opacity var(--duration-fast) var(--ease-out);
}

.nav__logo:hover .nav__logo-img {
  opacity: 0.85;
}

.nav__logo-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  white-space: nowrap;
}

.nav__logo-name {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: var(--fw-bold);
  color: var(--color-white);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  line-height: 1.1;
}

.nav__logo-tagline {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 8px;
  font-weight: var(--fw-regular);
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  line-height: 1.1;
  margin-top: 3px;
}

.nav__logo:hover .nav__logo-name {
  opacity: 0.85;
}

.nav__logo-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-teal);
  flex-shrink: 0;
  margin-left: var(--space-1);
}

/* ── Links ────────────────────────────────────────────────── */
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__links a {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color var(--duration-fast) var(--ease-out);
  position: relative;
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-teal);
  transition: width var(--duration-base) var(--ease-out);
}

.nav__links a:hover {
  color: var(--color-white);
}

.nav__links a:hover::after {
  width: 100%;
}

.nav__links a[aria-current="page"] {
  color: var(--color-white);
}

.nav__links a[aria-current="page"]::after {
  width: 100%;
}

/* ── CTA ──────────────────────────────────────────────────── */
.nav__cta {
  flex-shrink: 0;
}

/* ── Mobile hamburger (hidden on desktop) ────────────────── */
.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 4px;
  cursor: pointer;
  background: none;
  border: none;
  flex-shrink: 0;
}

.nav__burger-line {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: transform var(--duration-base) var(--ease-out), opacity var(--duration-base) var(--ease-out);
}

/* Mobile nav open state */
.nav.is-open .nav__burger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav.is-open .nav__burger-line:nth-child(2) {
  opacity: 0;
}
.nav.is-open .nav__burger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu overlay */
.nav__mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  top: 64px;
  background-color: rgba(10, 22, 40, 0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  z-index: calc(var(--z-nav) - 1);
}

.nav__mobile-menu.is-open {
  display: flex;
}

.nav__mobile-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav__mobile-links a {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--fw-bold);
  color: var(--color-white);
  text-decoration: none;
  letter-spacing: -0.01em;
  transition: color var(--duration-fast) var(--ease-out);
}

.nav__mobile-links a:hover {
  color: var(--color-teal);
}