/* ==========================================================================
   NAVIGATION
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding-block: 1.25rem;
  transition: background-color var(--transition-base), backdrop-filter var(--transition-base), border-color var(--transition-base), padding var(--transition-base);
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background-color: rgba(5, 5, 5, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--color-border);
  padding-block: 0.85rem;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--color-text-main);
  transition: opacity var(--transition-fast);
}

.nav-brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--color-neon-pink);
  object-fit: cover;
  box-shadow: 0 0 10px rgba(255, 26, 140, 0.3);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-brand:hover {
  opacity: 0.9;
}

.nav-brand:hover .nav-brand-icon {
  transform: scale(1.1) rotate(5deg);
  box-shadow: var(--glow-pink);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.nav-link {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  position: relative;
  padding-block: 0.25rem;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-base);
}

.nav-link:hover {
  color: var(--color-text-main);
}

.nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Mobile Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  cursor: pointer;
  z-index: 101;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text-main);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    inset: 0;
    background-color: rgba(5, 5, 5, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: 2rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
  }

  .nav-menu.is-open {
    opacity: 1;
    pointer-events: auto;
  }

  .nav-link {
    font-size: 1.5rem;
    font-weight: 600;
  }

  /* Hamburger transform when open */
  .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);
  }
}