/* ============================================
   NUKA · NAVIGATION v2
   Refined, quieter, more precise
   ============================================ */

.nuka-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  height: var(--nav-height);
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.nuka-nav.is-scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  border-bottom-color: var(--color-border);
}

.nuka-nav__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  width: 100%;
  padding: 0 var(--padding-x);
}

/* Logo */
.nuka-nav__logo {
  display: flex;
  align-items: center;
}

.nuka-nav__logo svg,
.nuka-nav__logo img {
  width: auto;
  height: 44px;
  display: block;
  transition: opacity var(--transition-fast);
}

.nuka-nav__logo:hover img {
  opacity: 0.7;
}

/* Desktop links */
.nuka-nav__links {
  display: none;
  align-items: center;
  gap: var(--space-xl);
}

.nuka-nav__link {
  font-family: var(--font-display);
  font-size: var(--text-meta);
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  transition: color var(--transition-fast);
  position: relative;
  padding: 4px 0;
}

.nuka-nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: width var(--transition-fast);
}

.nuka-nav__link:hover,
.nuka-nav__link.active {
  color: var(--color-accent);
}

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

/* Mobile hamburger */
.nuka-nav__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--color-primary);
  z-index: calc(var(--z-nav) + 2);
  background: none;
  border: none;
  cursor: pointer;
  position: relative;
}

.nuka-nav__toggle svg {
  width: 24px;
  height: 24px;
  stroke-width: 1.5;
}

/* Mobile menu panel — slides from right */
.nuka-nav__mobile {
  position: fixed;
  top: 0;
  right: 0;
  width: min(380px, 85vw);
  height: 100vh;
  height: 100dvh;
  background-color: var(--color-bg);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
  padding: 0;
  transform: translateX(100%);
  transition: transform var(--transition-mid);
  z-index: calc(var(--z-nav) + 3);
  box-shadow: -4px 0 48px rgba(0, 0, 0, 0.08);
  overflow-y: auto;
}

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

/* Mobile menu overlay */
.nuka-nav__mobile-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-mid), visibility var(--transition-mid);
  z-index: var(--z-nav);
  backdrop-filter: blur(4px);
}

.nuka-nav__mobile-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

/* Menu header with close button */
.nuka-nav__mobile-header {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  width: 100%;
  padding: calc(var(--nav-height) - 22px) var(--padding-x);
  background: var(--color-bg);
}

.nuka-nav__mobile-close {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  cursor: pointer;
}

/* Menu links container */
.nuka-nav__mobile-links {
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: var(--space-lg) var(--padding-x) var(--space-xl);
}

.nuka-nav__mobile-link {
  font-family: var(--font-display);
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 400;
  color: var(--color-primary);
  text-transform: uppercase;
  transition: color var(--transition-fast);
  width: 100%;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  line-height: 1.2;
}

.nuka-nav__mobile-link:hover,
.nuka-nav__mobile-link.active {
  color: var(--color-accent);
}

/* Responsive */
@media (min-width: 768px) {
  .nuka-nav__links {
    display: flex;
  }

  .nuka-nav__toggle {
    display: none;
  }

  .nuka-nav__mobile {
    display: none;
  }

  .nuka-nav__mobile-overlay {
    display: none;
  }
}