:root {
  --page-transition-duration: 220ms;
  --page-transition-overlay-duration: 460ms;
  --page-transition-bubble-count: 50;
}

html.page-transition-enabled body.page-transition {
  opacity: 0;
  transition: opacity var(--page-transition-duration) ease-in-out;
  will-change: opacity;
}

html.page-transition-enabled body.page-transition.is-visible {
  opacity: 1;
}

html.page-transition-enabled body.page-transition.is-exiting {
  opacity: 0.2;
}

.page-transition-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  display: none;
  overflow: hidden;
  contain: layout paint;
}

header[data-nav-enhanced] {
  position: sticky;
}

header[data-nav-enhanced]::after {
  /* Removed animated blue bar under navigation per request */
  display: none !important;
}

header[data-nav-enhanced] [data-nav-toggle] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 0.9rem;
  border: 1px solid rgba(17, 147, 212, 0.25);
  background: rgba(255, 255, 255, 0.85);
  color: var(--text-primary);
  box-shadow: 0 8px 18px rgba(17, 147, 212, 0.1);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
  backdrop-filter: blur(6px);
}

[data-theme="dark"] header[data-nav-enhanced] [data-nav-toggle] {
  background: rgba(15, 23, 42, 0.88);
  border-color: rgba(61, 184, 245, 0.35);
  box-shadow: 0 12px 22px rgba(13, 23, 42, 0.45);
  color: var(--text-primary);
}

header[data-nav-enhanced] [data-nav-toggle]:hover,
header[data-nav-enhanced] [data-nav-toggle]:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(17, 147, 212, 0.45);
  box-shadow: 0 12px 24px rgba(17, 147, 212, 0.18);
}

[data-theme="dark"] header[data-nav-enhanced] [data-nav-toggle]:hover,
[data-theme="dark"] header[data-nav-enhanced] [data-nav-toggle]:focus-visible {
  border-color: rgba(61, 184, 245, 0.55);
  box-shadow: 0 16px 28px rgba(15, 23, 42, 0.6);
}

header[data-nav-enhanced] [data-nav-toggle] .icon-close {
  display: none;
}

header[data-nav-enhanced] [data-nav-toggle][aria-expanded="true"] .icon-open {
  display: none;
}

header[data-nav-enhanced] [data-nav-toggle][aria-expanded="true"] .icon-close {
  display: block;
}

header[data-nav-enhanced] [data-nav-mobile] {
  position: relative;
  width: 100%;
}

header[data-nav-enhanced] [data-nav-mobile] nav {
  margin-top: 0.75rem;
  border-radius: 1rem;
  border: 1px solid rgba(17, 147, 212, 0.18);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 18px 40px rgba(17, 147, 212, 0.18);
  backdrop-filter: blur(8px);
  padding: 0.75rem;
  transform-origin: top;
}

[data-theme="dark"] header[data-nav-enhanced] [data-nav-mobile] nav {
  background: rgba(15, 23, 42, 0.94);
  border-color: rgba(61, 184, 245, 0.25);
  box-shadow: 0 22px 48px rgba(15, 23, 42, 0.6);
}

header[data-nav-enhanced][data-nav-open="true"] [data-nav-mobile] nav {
  animation: nav-slide-down 220ms cubic-bezier(0.3, 0.7, 0.4, 1) both;
}

header[data-nav-enhanced] [data-nav-mobile] a {
  display: block;
  padding: 0.65rem 0.75rem;
  border-radius: 0.75rem;
  transition: background-color 140ms ease, color 140ms ease, transform 140ms ease;
}

header[data-nav-enhanced] [data-nav-mobile] a:hover {
  background-color: rgba(17, 147, 212, 0.08);
  transform: translateX(4px);
}

[data-theme="dark"] header[data-nav-enhanced] [data-nav-mobile] a:hover {
  background-color: rgba(61, 184, 245, 0.1);
}

header[data-nav-enhanced][data-nav-open="true"] {
  transition: box-shadow 180ms ease;
  box-shadow: 0 18px 32px rgba(17, 147, 212, 0.12);
}

[data-theme="dark"] header[data-nav-enhanced][data-nav-open="true"] {
  box-shadow: 0 24px 36px rgba(8, 18, 36, 0.55);
}

header[data-nav-enhanced]::before {
  /* Removed subtle gradient line under navigation per request */
  display: none !important;
}

[data-theme="dark"] header[data-nav-enhanced]::after {
  background: linear-gradient(90deg,
      rgba(61, 184, 245, 0) 0%,
      rgba(61, 184, 245, 0.45) 25%,
      rgba(61, 184, 245, 0.75) 50%,
      rgba(61, 184, 245, 0.45) 75%,
      rgba(61, 184, 245, 0) 100%);
}

[data-theme="dark"] header[data-nav-enhanced]::before {
  background: linear-gradient(90deg,
      transparent 0%,
      rgba(61, 184, 245, 0.35) 15%,
      rgba(61, 184, 245, 0.5) 50%,
      rgba(61, 184, 245, 0.35) 85%,
      transparent 100%);
}

@keyframes navbar-glide {
  0% {
    background-position: 0% 50%;
    transform: translate3d(-18%, 0, 0);
    opacity: 0.7;
  }
  25% {
    background-position: 65% 50%;
    transform: translate3d(6%, 0, 0);
    opacity: 0.9;
  }
  50% {
    background-position: 130% 50%;
    transform: translate3d(18%, 0, 0);
    opacity: 1;
  }
  75% {
    background-position: 65% 50%;
    transform: translate3d(-6%, 0, 0);
    opacity: 0.9;
  }
  100% {
    background-position: 0% 50%;
    transform: translate3d(-18%, 0, 0);
    opacity: 0.7;
  }
}

@keyframes nav-slide-down {
  0% {
    opacity: 0;
    transform: translate3d(0, -10px, 0) scaleY(0.96);
  }
  100% {
    opacity: 1;
    transform: translate3d(0, 0, 0) scaleY(1);
  }
}

.page-transition-overlay.is-active {
  display: block;
}

.page-transition-overlay .bubble {
  position: absolute;
  bottom: -15vh;
  width: var(--bubble-size, 42px);
  height: var(--bubble-size, 42px);
  border-radius: 50%;
  background:
    radial-gradient(circle at 32% 28%, rgba(255, 255, 255, 0.9) 0%, rgba(255, 255, 255, 0.25) 42%, rgba(17, 147, 212, 0.35) 100%),
    radial-gradient(circle at 70% 68%, rgba(17, 147, 212, 0.18), transparent 60%);
  box-shadow:
    0 8px 18px rgba(17, 147, 212, 0.15),
    inset 0 0 0 1px rgba(255, 255, 255, 0.55),
    inset 0 0 14px rgba(17, 147, 212, 0.2);
  opacity: 0;
  animation: bubble-rise var(--bubble-duration, var(--page-transition-overlay-duration)) cubic-bezier(0.32, 0.01, 0.58, 1) forwards;
  animation-delay: var(--bubble-delay, 0s);
  will-change: transform, opacity;
}

.page-transition-overlay .bubble::after {
  content: "";
  position: absolute;
  inset: 18% 24% auto auto;
  width: 30%;
  height: 30%;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 40%, rgba(255, 255, 255, 0.85) 0%, rgba(255, 255, 255, 0.35) 55%, transparent 100%);
}

.page-transition-overlay.is-leaving .bubble {
  opacity: 1;
}

@keyframes bubble-rise {
  0% {
    transform: translate3d(0, 0, 0) scale(0.55);
    opacity: 0;
  }
  5% {
    opacity: 0.82;
  }
  35% {
    opacity: 0.95;
  }
  70% {
    opacity: 0.86;
  }
  100% {
    transform: translate3d(0, -120vh, 0) scale(1.25);
    opacity: 0;
  }
}


.page-transition-overlay.is-entering .bubble {
  animation-name: bubble-rise;
}

html.page-transition-enabled body.page-transition.bubble-hidden {
  opacity: 0;
}

@media (prefers-reduced-motion: reduce) {
  html.page-transition-enabled body.page-transition {
    transition: none;
  }

  .page-transition-overlay {
    display: none !important;
  }

  header[data-nav-enhanced]::after {
    animation: none;
    transform: none;
    opacity: 0.65;
  }

  header[data-nav-enhanced][data-nav-open="true"] [data-nav-mobile] nav {
    animation: none;
  }
}