/* 3D vs AR article demos — cream/ink/red, local model-viewer, no CDN */
.ar3-demo {
  --ar3-bg: #faf7f1;
  --ar3-paper: #ffffff;
  --ar3-ink: #0a0a0a;
  --ar3-muted: #6b6357;
  --ar3-border: #ddd5c5;
  --ar3-accent: #ff3d2e;
  --ar3-stage: #efe8dc;
  margin: 1.5rem 0 2rem;
  padding: 1.25rem 1.25rem 1.35rem;
  background: var(--ar3-bg);
  border: 1px solid var(--ar3-border);
  border-radius: 14px;
}

.ar3-demo__label {
  display: inline-block;
  margin: 0 0 0.65rem;
  padding: 0.2rem 0.55rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ar3-muted);
  background: var(--ar3-paper);
  border: 1px solid var(--ar3-border);
  border-radius: 4px;
}

.ar3-demo__title {
  margin: 0 0 0.35rem;
  font-family: Unbounded, Manrope, sans-serif;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--ar3-ink);
  line-height: 1.35;
}

.ar3-demo__hint {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  color: var(--ar3-muted);
  line-height: 1.45;
}

.ar3-demo__caption {
  margin: 0.85rem 0 0;
  font-size: 0.88rem;
  color: var(--ar3-muted);
  line-height: 1.45;
}

.ar3-stage {
  position: relative;
  background: var(--ar3-stage);
  border: 1px solid var(--ar3-border);
  border-radius: 12px;
  overflow: hidden;
  min-height: 280px;
  max-width: 420px;
  margin: 0 auto;
  aspect-ratio: 1 / 1;
  touch-action: none;
}

.ar3-stage model-viewer {
  display: block;
  width: 100%;
  height: 100%;
  background: transparent;
  --poster-color: #efe8dc;
}

.ar3-css {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  perspective: 900px;
  cursor: grab;
  z-index: 1;
}

.ar3-css.is-hidden {
  visibility: hidden;
  pointer-events: none;
}

.ar3-css.is-dragging {
  cursor: grabbing;
}

.ar3-css__cube {
  width: 132px;
  height: 132px;
  aspect-ratio: 1 / 1;
  position: relative;
  transform-style: preserve-3d;
  transform: rotateX(-22deg) rotateY(32deg);
  will-change: transform;
}

.ar3-css__face {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 6px;
  padding: 8px;
  background: #111;
  border-radius: 6px;
  backface-visibility: hidden;
}

.ar3-css__face span {
  display: block;
  border-radius: 4px;
}

.ar3-css__face--f { transform: translateZ(66px); }
.ar3-css__face--b { transform: rotateY(180deg) translateZ(66px); }
.ar3-css__face--r { transform: rotateY(90deg) translateZ(66px); }
.ar3-css__face--l { transform: rotateY(-90deg) translateZ(66px); }
.ar3-css__face--u { transform: rotateX(90deg) translateZ(66px); }
.ar3-css__face--d { transform: rotateX(-90deg) translateZ(66px); }

.ar3-css__face--f span { background: #1456c8; }
.ar3-css__face--b span { background: #149e47; }
.ar3-css__face--r span { background: #c7171f; }
.ar3-css__face--l span { background: #eb6b14; }
.ar3-css__face--u span { background: #f4f1ea; }
.ar3-css__face--d span { background: #f5c713; }

.ar3-ar-btn {
  position: absolute;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  z-index: 2;
  appearance: none;
  border: 0;
  background: #0a0a0a;
  color: #fff;
  font-family: Manrope, sans-serif;
  font-size: 0.88rem;
  font-weight: 700;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(10, 10, 10, 0.18);
}

.ar3-ar-btn[hidden],
.ar3-ar-btn.is-hidden {
  display: none !important;
}

.ar3-ar-btn:hover {
  background: #ff3d2e;
}

.ar3-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.ar3-btn {
  appearance: none;
  border: 1px solid var(--ar3-border);
  background: var(--ar3-paper);
  color: var(--ar3-ink);
  font-family: Manrope, sans-serif;
  font-size: 0.86rem;
  font-weight: 600;
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
}

.ar3-btn:hover {
  border-color: var(--ar3-ink);
}

.ar3-note {
  margin: 0.75rem 0 0;
  padding: 0.7rem 0.8rem;
  background: var(--ar3-paper);
  border: 1px dashed var(--ar3-border);
  border-radius: 8px;
  font-size: 0.86rem;
  color: var(--ar3-muted);
  line-height: 1.45;
}

.ar3-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin: 1.5rem 0 2rem;
}

.ar3-split__card {
  margin: 0;
  background: #faf7f1;
  border: 1px solid #ddd5c5;
  border-radius: 14px;
  overflow: hidden;
}

.ar3-split__card img {
  display: block;
  width: 100%;
  height: 220px;
  object-fit: contain;
  background: #efe8dc;
}

.ar3-split__body {
  padding: 0.85rem 0.95rem 1rem;
}

.ar3-split__kicker {
  margin: 0 0 0.25rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #6b6357;
}

.ar3-split__body p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.45;
  color: #2b2b2b;
}

.ar3-phone {
  margin: 1.5rem 0 0;
}

.ar3-phone img {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: contain;
  margin: 0 auto;
  border-radius: 16px;
  border: 1px solid #ddd5c5;
}

@media (max-width: 720px) {
  .ar3-split {
    grid-template-columns: 1fr;
  }
  .ar3-stage {
    max-width: 100%;
  }
  .ar3-css__cube {
    width: 110px;
    height: 110px;
    aspect-ratio: 1 / 1;
  }
  .ar3-css__face--f { transform: translateZ(55px); }
  .ar3-css__face--b { transform: rotateY(180deg) translateZ(55px); }
  .ar3-css__face--r { transform: rotateY(90deg) translateZ(55px); }
  .ar3-css__face--l { transform: rotateY(-90deg) translateZ(55px); }
  .ar3-css__face--u { transform: rotateX(90deg) translateZ(55px); }
  .ar3-css__face--d { transform: rotateX(-90deg) translateZ(55px); }
}

@media (prefers-reduced-motion: reduce) {
  .ar3-css__cube {
    transition: none;
  }
}