:root {
  --friend-image: url("assets/friend-fallback.svg");
  --ink: #050507;
  --hot: #ff3d8b;
  --sun: #ffd44d;
  --mint: #5ef2c2;
  --blue: #55b8ff;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
  background:
    radial-gradient(circle at 18% 18%, rgba(255, 212, 77, 0.24), transparent 24rem),
    radial-gradient(circle at 84% 20%, rgba(94, 242, 194, 0.18), transparent 22rem),
    radial-gradient(circle at 50% 80%, rgba(255, 61, 139, 0.22), transparent 26rem),
    var(--ink);
  color: white;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.stage {
  position: relative;
  width: 100vw;
  min-height: 100vh;
  isolation: isolate;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.stage::before,
.stage::after {
  position: fixed;
  inset: -10vmax;
  z-index: -2;
  content: "";
  opacity: 0.42;
  pointer-events: none;
}

.stage::before {
  background-image:
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 5.4rem 5.4rem;
  transform: rotate(-9deg) scale(1.16);
}

.stage::after {
  background:
    conic-gradient(from 90deg at 50% 50%, rgba(85, 184, 255, 0.12), transparent, rgba(255, 212, 77, 0.14), transparent),
    repeating-linear-gradient(115deg, transparent 0 1.35rem, rgba(255, 255, 255, 0.04) 1.35rem 1.5rem);
  mix-blend-mode: screen;
}

.glow {
  position: fixed;
  width: 58vmin;
  aspect-ratio: 1;
  border-radius: 50%;
  filter: blur(14px);
  opacity: 0.84;
  pointer-events: none;
}

.glow-one {
  left: -12vmin;
  top: -10vmin;
  background: radial-gradient(circle, rgba(255, 61, 139, 0.45), transparent 68%);
}

.glow-two {
  right: -18vmin;
  bottom: -14vmin;
  background: radial-gradient(circle, rgba(94, 242, 194, 0.38), transparent 70%);
}

.skyline {
  position: fixed;
  inset: 0;
  z-index: 8;
  display: grid;
  align-content: space-between;
  padding-block: 2.5vmin;
  pointer-events: none;
}

.skyline-track {
  display: flex;
  width: max-content;
  gap: clamp(0.8rem, 2vmin, 1.8rem);
  animation: slide 34s linear infinite;
}

.skyline-track.reverse {
  animation-duration: 24s;
  animation-direction: reverse;
}

.skyline-img {
  width: clamp(7rem, 16vmin, 14rem);
  aspect-ratio: 1;
  object-fit: contain;
  filter:
    drop-shadow(0 1rem 0 rgba(255, 61, 139, 0.75))
    drop-shadow(0 -0.7rem 0 rgba(94, 242, 194, 0.58))
    drop-shadow(0 1.2rem 1.4rem rgba(0, 0, 0, 0.45));
  transform: rotate(var(--tilt, 0deg));
  -webkit-touch-callout: none;
  user-select: none;
}

.scroll-stack {
  position: relative;
  z-index: 3;
}

.photo-panel {
  --panel-image: var(--friend-image);
  --panel-hot: var(--hot);
  --panel-cool: var(--blue);
  --hero-tilt: -2deg;
  --hero-tilt-end: 2deg;
  position: relative;
  display: grid;
  min-height: 100svh;
  place-items: center;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.08), transparent 40%),
    radial-gradient(circle at var(--spot-x) var(--spot-y), var(--panel-cool), transparent 34rem),
    linear-gradient(160deg, rgba(255, 61, 139, 0.24), rgba(5, 5, 7, 0.68) 52%, rgba(255, 212, 77, 0.18));
}

.photo-panel::before,
.photo-panel::after {
  position: absolute;
  inset: -12vmin;
  content: "";
  pointer-events: none;
}

.photo-panel::before {
  z-index: 1;
  background-image: var(--panel-image);
  background-repeat: repeat;
  background-size: clamp(8rem, 22vmin, 18rem);
  opacity: 0.18;
  transform: rotate(var(--pattern-tilt));
  filter: saturate(1.4);
}

.photo-panel::after {
  z-index: 2;
  background:
    linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.14), transparent),
    radial-gradient(circle at 50% 50%, transparent 0 34vmin, rgba(5, 5, 7, 0.42) 68vmin);
  mix-blend-mode: screen;
}

.panel-image {
  position: relative;
  z-index: 4;
  width: min(122vmin, 78rem);
  max-width: none;
  aspect-ratio: 1;
  object-fit: contain;
  transform: rotate(var(--hero-tilt));
  filter:
    drop-shadow(0.9rem 0.9rem 0 var(--panel-hot))
    drop-shadow(-0.8rem -0.8rem 0 var(--panel-cool))
    drop-shadow(0 2.2rem 2.8rem rgba(0, 0, 0, 0.62));
  animation: enormous 3.4s ease-in-out infinite alternate;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  user-select: none;
}

.pop-friend {
  --pop-brightness: 1;
  --pop-contrast: 1;
  --pop-hue: 0deg;
  --pop-saturation: 1;
  --pop-sepia: 0;
  --pop-shadow-one: rgba(94, 242, 194, 0.7);
  --pop-shadow-two: rgba(255, 212, 77, 0.72);
  position: fixed;
  z-index: 12;
  left: var(--x);
  top: var(--y);
  width: var(--size);
  aspect-ratio: 1;
  object-fit: contain;
  transform: translate(-50%, -50%) rotate(var(--rotate)) scale(0.2);
  filter:
    brightness(var(--pop-brightness))
    contrast(var(--pop-contrast))
    saturate(var(--pop-saturation))
    sepia(var(--pop-sepia))
    hue-rotate(var(--pop-hue))
    drop-shadow(0.8rem 0.8rem 0 var(--pop-shadow-one))
    drop-shadow(-0.7rem -0.7rem 0 var(--pop-shadow-two))
    drop-shadow(0 1.8rem 2.2rem rgba(0, 0, 0, 0.62));
  animation: pop 1200ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
  -webkit-touch-callout: none;
  pointer-events: none;
  user-select: none;
}

@keyframes slide {
  from {
    transform: translateX(-50%);
  }

  to {
    transform: translateX(0);
  }
}

@keyframes bob {
  from {
    translate: 0 -1.2vmin;
  }

  to {
    translate: 0 1.8vmin;
  }
}

@keyframes enormous {
  from {
    transform: rotate(var(--hero-tilt)) scale(0.98);
  }

  to {
    transform: rotate(var(--hero-tilt-end)) scale(1.04);
  }
}

@keyframes pop {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) rotate(var(--rotate)) scale(0.12);
  }

  12% {
    opacity: 1;
  }

  74% {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(var(--rotate-mid)) scale(1);
  }

  100% {
    opacity: 0;
    transform: translate(-50%, -50%) rotate(var(--rotate-out)) scale(1.35);
  }
}

@media (max-width: 720px) {
  .panel-image {
    width: 142vmin;
  }

  .skyline {
    padding-block: 1.5vmin;
  }

  .skyline-img {
    width: clamp(5rem, 22vmin, 9rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}