html.party-mode {
  --party-red: #ff3158;
  --party-orange: #ff9f0a;
  --party-yellow: #ffe043;
  --party-green: #32d74b;
  --party-blue: #38bdf8;
  --party-purple: #a855f7;
}

html.party-mode body {
  background: linear-gradient(
    125deg,
    var(--party-red),
    var(--party-orange),
    var(--party-yellow),
    var(--party-green),
    var(--party-blue),
    var(--party-purple),
    var(--party-red)
  );
  background-size: 500% 500%;
  animation: party-rainbow 4s linear infinite;
}

html.party-mode body::before {
  content: "";
  position: fixed;
  z-index: 9990;
  inset: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(255, 255, 255, 0.42), transparent 20%),
    radial-gradient(circle at 82% 72%, rgba(255, 255, 255, 0.28), transparent 23%);
  opacity: 0.75;
  pointer-events: none;
  animation: party-lights 1.6s ease-in-out infinite alternate;
}

html.party-mode .page-shell,
html.party-mode .site-shell,
html.party-mode .site-footer {
  position: relative;
  z-index: 1;
}

html.party-mode .page-shell > section,
html.party-mode .site-header,
html.party-mode .page-content > section,
html.party-mode .footer-main,
html.party-mode .footer-base {
  border-radius: 1rem;
  background: color-mix(in srgb, var(--surface, white) 86%, transparent);
  box-shadow: 0 12px 42px rgba(0, 0, 0, 0.12);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

html.party-mode .page-shell > section,
html.party-mode .page-content > section {
  padding: 1.25rem;
}

.party-canvas {
  position: fixed;
  z-index: 9992;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.party-badge {
  position: fixed;
  z-index: 10001;
  top: max(1rem, env(safe-area-inset-top));
  left: 50%;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.68);
  border-radius: 999px;
  background: rgba(20, 18, 28, 0.82);
  color: white;
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.28);
  font: 700 0.75rem/1 system-ui, sans-serif;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transform: translateX(-50%);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.party-badge::before {
  content: "🎉";
  font-size: 1rem;
}

.party-exit {
  position: fixed;
  left: 50%;
  bottom: max(1rem, env(safe-area-inset-bottom));
  z-index: 10002;
  max-width: calc(100vw - 2rem);
  transform: translate(-50%, 10px);
  border: 1px solid color-mix(in srgb, currentColor 18%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, Canvas 94%, transparent);
  color: CanvasText;
  box-shadow: 0 8px 30px rgb(0 0 0 / 12%);
  padding: 0.6rem 0.9rem;
  font: 600 0.78rem/1.2 system-ui, sans-serif;
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease, transform 160ms ease;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.party-exit.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

@keyframes party-rainbow {
  to { background-position: 500% 50%; }
}

@keyframes party-lights {
  from { opacity: 0.38; filter: hue-rotate(0deg); }
  to { opacity: 0.86; filter: hue-rotate(150deg); }
}

@media (prefers-reduced-motion: reduce) {
  html.party-mode body,
  html.party-mode body::before {
    animation: none !important;
  }

  .party-exit {
    transition: none;
  }
}

.shrink-stage {
  position: fixed;
  z-index: 1;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100vh;
  overflow: visible;
  transform: translate(-50%, -50%) scale(1);
  transform-origin: 50% 50%;
  transition: transform 720ms cubic-bezier(0.16, 1, 0.3, 1);
}

html.shrink-mode .shrink-stage {
  transform: translate(-50%, -50%) scale(0.14);
}

.shrink-status {
  position: fixed;
  left: 50%;
  bottom: max(1rem, env(safe-area-inset-bottom));
  z-index: 10004;
  max-width: calc(100vw - 2rem);
  transform: translate(-50%, 10px);
  border: 1px solid color-mix(in srgb, currentColor 18%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, Canvas 94%, transparent);
  color: CanvasText;
  box-shadow: 0 8px 30px rgb(0 0 0 / 12%);
  padding: 0.6rem 0.9rem;
  font: 600 0.78rem/1.2 system-ui, sans-serif;
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease, transform 160ms ease;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.shrink-status.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.shrink-magnifier {
  position: fixed;
  z-index: 10003;
  top: 0;
  left: 0;
  width: clamp(9rem, 16vw, 12rem);
  aspect-ratio: 1;
  opacity: 0;
  pointer-events: none;
  will-change: transform;
  transition: opacity 120ms ease;
}

.shrink-magnifier::after {
  content: "";
  position: absolute;
  right: -1.15rem;
  bottom: -1.15rem;
  width: 3.4rem;
  height: 0.8rem;
  border-radius: 999px;
  background: color-mix(in srgb, CanvasText 82%, transparent);
  transform: rotate(45deg);
  transform-origin: left center;
  box-shadow: 0 4px 12px rgb(0 0 0 / 20%);
}

.shrink-magnifier-viewport {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border: 3px solid color-mix(in srgb, CanvasText 78%, transparent);
  border-radius: 50%;
  background: Canvas;
  box-shadow: 0 12px 38px rgb(0 0 0 / 24%), inset 0 0 0 1px rgb(255 255 255 / 35%);
}

.shrink-magnifier.is-visible {
  opacity: 1;
}

.shrink-magnifier-copy {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  min-height: 100vh;
  transform-origin: 0 0;
  pointer-events: none;
  will-change: transform;
}

@media (prefers-reduced-motion: reduce) {
  .shrink-stage {
    transition-duration: 1ms;
  }

  .shrink-status,
  .shrink-magnifier {
    transition: none;
  }
}