/* ============================================
   NAVIGATION - V6
   ============================================ */

.navbar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-md) var(--container-padding);
  background: transparent;
  z-index: var(--z-fixed);
  transition: all var(--transition-base);
}

.navbar.scrolled {
  position: fixed;
  background: rgba(26, 26, 26, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-sm) var(--container-padding);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0;
  max-width: var(--container-max-width);
  margin: 0 auto;
}

.nav-brand {
  display: flex;
  align-items: center;
}

.nav-logo {
  position: relative;
  display: block;
  flex: 0 0 auto;
  /* Explicit size: keeps the 700:225 logo ratio (empty span would collapse). */
  height: clamp(28px, 3.2vw, 40px);
  width: clamp(87px, 9.96vw, 124px);
  transition: transform var(--transition-base);
  animation: logoPopIn 0.95s cubic-bezier(0.22, 1, 0.36, 1) 0.2s 1 backwards;
}

/* Blue and white logo are stacked; the white one fades in over the blue
   to animate the brand-blue -> white color transition on load. */
.nav-logo img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.nav-logo-white {
  opacity: 0;
  animation: logoColorReveal 1.1s ease 0.55s both;
}

@media (prefers-reduced-motion: reduce) {
  .nav-logo {
    animation: none;
  }
  .nav-logo-white {
    animation: none;
    opacity: 1;
  }
}

.nav-logo:hover {
  transform: scale(1.05);
}

.nav-menu {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-link {
  font-family: var(--font-heading);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-light);
  position: relative;
  transition: color var(--transition-base);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
}

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

.nav-link:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  padding: var(--spacing-xs);
  background: transparent;
  border: none;
  cursor: pointer;
}

.burger-icon {
  display: block;
  width: 46px;
  height: 40px;
  transition: all var(--transition-base);
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

.burger-icon .seeds,
.burger-icon .lettuce {
  fill: var(--color-primary);
}

.burger-icon .bun-top,
.burger-icon .bun-bottom,
.burger-icon .lettuce,
.burger-icon .patty {
  transition: transform 0.35s ease, opacity 0.3s ease;
  transform-box: fill-box;
  transform-origin: center;
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 70%;
    height: 100vh;
    background: rgba(26, 26, 26, 0.98);
    backdrop-filter: blur(10px);
    flex-direction: column;
    justify-content: center;
    gap: var(--spacing-xl);
    padding: var(--spacing-xl);
    /* translateX keeps the closed menu off-screen without creating
       horizontal overflow (right:-100% did, shifting the page sideways) */
    transform: translateX(100%);
    transition: transform var(--transition-base);
    z-index: 100;
  }

  .nav-menu.active {
    transform: translateX(0);
  }

  .nav-link {
    font-size: var(--font-size-xl);
  }

  .nav-toggle {
    display: flex;
    z-index: 101;
  }

  .nav-toggle.active .bun-top {
    transform: translateY(-5px) rotate(-12deg);
  }

  .nav-toggle.active .lettuce,
  .nav-toggle.active .patty {
    opacity: 0;
    transform: scaleX(0.3);
  }

  .nav-toggle.active .bun-bottom {
    transform: translateY(5px);
  }
}