:root {
  --bg: #000;
  --ink: #f2f2f2;
  --dim: #9a9a9a;
  --line: #333;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

button, .button {
  font: inherit;
  color: var(--bg);
  background: var(--ink);
  border: 0;
  border-radius: 999px;
  padding: 0.7em 1.6em;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}

/* ---- effect pages ---- */

body.effect { height: 100%; overflow: hidden; }

#ar-viewport { position: fixed; inset: 0; }

#start {
  position: fixed;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 1rem;
  padding: 16px;
  text-align: center;
  z-index: 10;
}
#start[hidden] { display: none; }
#start h1 { font-size: 1.25rem; font-weight: 500; margin: 0; }
#start p { margin: 0; color: var(--dim); max-width: 22rem; }
#start p.error:empty { display: none; }

#hint {
  position: absolute;
  left: 0;
  right: 0;
  top: 18%;
  text-align: center;
  font-size: 1.1rem;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.7);
  pointer-events: none;
}
#hint[hidden] { display: none; }

/* ---- index ---- */

main.index {
  max-width: 40rem;
  margin: 0 auto;
  padding: 32px 16px 64px;
}
main.index h1 { font-size: 1.25rem; font-weight: 500; margin: 0 0 0.25rem; }
main.index > p { color: var(--dim); margin: 0 0 2rem; }

.effect-item {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  align-items: start;
}
.effect-item h2 { font-size: 1.05rem; font-weight: 500; margin: 0; }
.effect-item .meta { color: var(--dim); margin: 0.1rem 0 0.6rem; font-size: 0.9rem; }
.effect-item p { margin: 0 0 0.9rem; }
.effect-item .actions { display: flex; gap: 0.75rem; align-items: center; flex-wrap: wrap; }
.effect-item .actions a.target { color: var(--dim); }
.effect-item .qr { width: 96px; height: 96px; background: #fff; padding: 6px; border-radius: 4px; }
.effect-item .qr img, .effect-item .qr canvas { width: 100%; height: 100%; display: block; image-rendering: pixelated; }

footer { color: var(--dim); font-size: 0.85rem; border-top: 1px solid var(--line); padding-top: 1rem; }

@media (max-width: 480px) {
  .effect-item { grid-template-columns: 1fr; }
  .effect-item .qr { display: none; }
}

/* ---- target page ---- */

body.target { height: 100vh; overflow: hidden; display: grid; place-items: center; cursor: none; }
body.target #target { width: 100vw; height: 100vh; object-fit: contain; display: block; }
.target-qr {
  position: fixed;
  right: 16px;
  bottom: 16px;
  width: 104px;
  height: 104px;
  background: #fff;
  padding: 4px;
  border-radius: 4px;
  cursor: pointer;
}
.target-qr img { width: 100%; height: 100%; display: block; image-rendering: pixelated; }
#start p.links { font-size: 0.9rem; }
#start p.links a { color: var(--dim); }