:root {
  --viewer-accent: #6b46a3;
  --viewer-accent-soft: rgba(107, 70, 163, .18);
  --viewer-ink: #312344;
  --viewer-bg-top: #ffffff;
  --viewer-bg-bottom: #f0edf4;
}

* { box-sizing: border-box; }

html,
body,
#viewer-root {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
}

body {
  background:
    radial-gradient(circle at 50% 24%, rgba(255, 255, 255, .96) 0 20%, transparent 55%),
    radial-gradient(circle at 82% 12%, var(--viewer-accent-soft), transparent 38%),
    linear-gradient(180deg, var(--viewer-bg-top), var(--viewer-bg-bottom));
  color: var(--viewer-ink);
  font-family: "Helvetica Neue", Arial, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

#viewer-root { position: relative; isolation: isolate; }

#viewer-root::before {
  content: "";
  position: absolute;
  z-index: -1;
  left: 50%;
  top: 52%;
  width: min(58vw, 420px);
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,.72), transparent 69%);
  filter: blur(18px);
}

canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

.viewer-loading {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: grid;
  place-items: center;
  background: linear-gradient(180deg, rgba(255,255,255,.96), rgba(248,248,248,.92));
  transition: opacity .32s ease, visibility .32s ease;
}

.viewer-loading.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.viewer-loading-card {
  width: min(68vw, 250px);
  text-align: center;
}

.viewer-loading-label {
  display: block;
  margin-bottom: 12px;
  color: var(--viewer-ink);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
}

.viewer-loading-track {
  height: 5px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(19, 13, 30, .08);
}

.viewer-loading-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--viewer-accent);
  transition: width .18s ease;
}

.viewer-hint {
  position: absolute;
  z-index: 2;
  bottom: max(14px, env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  padding: 7px 12px;
  border: 1px solid rgba(25, 18, 37, .07);
  border-radius: 999px;
  background: rgba(255,255,255,.72);
  box-shadow: 0 12px 30px rgba(31, 22, 47, .10);
  color: var(--viewer-ink);
  backdrop-filter: blur(10px);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: .16em;
  line-height: 1;
  text-transform: uppercase;
  white-space: nowrap;
  pointer-events: none;
}

@media (max-width: 480px) {
  .viewer-hint { bottom: 10px; font-size: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  .viewer-loading { transition: none; }
}