/* ============================================================
   ORBIX LABS — Navigation
   ============================================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background var(--transition-slow), backdrop-filter var(--transition-slow), border-color var(--transition-slow), box-shadow var(--transition-slow);
  border-bottom: 1px solid transparent;
}

.nav--scrolled {
  background: rgba(17, 19, 24, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--color-border);
  box-shadow: 0 1px 20px rgba(0,0,0,0.3);
}

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

/* ── Logo ── */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.nav__logo-mark {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.nav__logo-text {
  font-size: var(--text-lg);
  font-weight: var(--fw-semibold);
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

/* ── Desktop Menu ── */
.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

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

.nav__link {
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-body);
  text-decoration: none;
  transition: color var(--transition-base);
  position: relative;
  padding-bottom: 2px;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-gradient);
  border-radius: var(--radius-full);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--color-text-primary);
}

.nav__link:hover::after,
.nav__link.is-active::after {
  transform: scaleX(1);
}

/* ── Mobile Hamburger ── */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 200;
}

.nav__hamburger-line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transition: transform var(--transition-slow), opacity var(--transition-base), width var(--transition-slow);
  transform-origin: center;
}

.nav__hamburger.is-open .nav__hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__hamburger.is-open .nav__hamburger-line:nth-child(2) {
  opacity: 0;
  width: 0;
}
.nav__hamburger.is-open .nav__hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Mobile Overlay Menu ── */
.nav__mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: var(--color-bg-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-6) var(--container-pad) var(--space-8);
  transform: translateY(-10px);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--transition-slow), opacity var(--transition-slow);
  z-index: 99;
}

.nav__mobile.is-open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.nav__mobile-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-bottom: var(--space-6);
  list-style: none;
}

.nav__mobile-link {
  display: block;
  padding: var(--space-3) 0;
  font-size: var(--text-lg);
  font-weight: var(--fw-medium);
  color: var(--color-text-body);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-base);
}

.nav__mobile-link:last-child {
  border-bottom: none;
}

.nav__mobile-link:hover {
  color: var(--color-text-primary);
}

@media (max-width: 767px) {
  .nav__menu {
    display: none;
  }
  .nav__hamburger {
    display: flex;
  }
  .nav__mobile {
    display: block;
  }
}