Create css/style.css

css/style.css

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+/* ===========================
+   Global overlay scaffolding
+   =========================== */
+#xr-overlay-root {
+  position: fixed;
+  inset: 0;
+  z-index: 9999;              /* Above site chrome */
+  pointer-events: none;       /* Let underlying elements receive events unless explicitly enabled */
+}
+
+/* Message toast (bottom center) */
+.pc-ar-msg {
+  position: fixed;
+  left: 50%;
+  transform: translateX(-50%);
+  bottom: 16px;
+  z-index: 2;
+  padding: 10px 14px;
+  background: rgba(0, 0, 0, 0.65);
+  color: #fff;
+  border-radius: 12px;
+  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
+  font-size: 14px;
+  line-height: 1.3;
+  text-align: center;
+  max-width: min(90vw, 640px);
+  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
+  backdrop-filter: blur(4px);
+  pointer-events: none;       /* Non-clickable */
+  user-select: none;
+}
+
+/* ===========================
+   AR Launch Button
+   =========================== */
+#ar-launch-btn {
+  position: fixed;
+  left: 50%;
+  transform: translateX(-50%);
+  bottom: 72px;               /* Sits above the message toast */
+  z-index: 10001;
+  pointer-events: auto;
+
+  appearance: none;
+  border: none;
+  border-radius: 14px;
+  padding: 12px 18px;
+  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
+  font-size: 15px;
+  font-weight: 600;
+  color: #fff;
+  background: rgba(0, 0, 0, 0.85);
+  box-shadow: 0 6px 18px rgba(0,0,0,.25);
+  backdrop-filter: blur(6px);
+  cursor: pointer;
+  touch-action: manipulation;
+  -webkit-tap-highlight-color: transparent;
+}
+#ar-launch-btn:active { transform: translateX(-50%) scale(0.98); }
+#ar-launch-btn:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+/* Hidden anchor used for iOS Quick Look trigger (kept invisible) */
+#ios-quicklook-anchor {
+  position: absolute !important;
+  width: 1px !important;
+  height: 1px !important;
+  overflow: hidden !important;
+  clip-path: inset(50%) !important;
+  pointer-events: none !important;
+}
+
+/* ===========================
+   Vertical Rotation Slider UI
+   =========================== */
+/* Panel container */
+.ar-ui {
+  position: absolute;                /* inside #xr-overlay-root space */
+  right: 12px;
+  top: 50%;
+  transform: translateY(-50%);
+  z-index: 10000;
+  pointer-events: auto;              /* Make this panel interactive */
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 8px;
+
+  width: 56px;
+  padding: 12px 10px;
+  border-radius: 16px;
+
+  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
+  color: #fff;
+  background: rgba(0, 0, 0, 0.55);
+  box-shadow: 0 6px 18px rgba(0,0,0,.25);
+  backdrop-filter: blur(6px);
+
+  touch-action: none;  /* Prevent page scroll while sliding */
+  -webkit-tap-highlight-color: transparent;
+  user-select: none;
+}
+
+.ar-ui .label {
+  font-size: 12px;
+  text-align: center;
+  opacity: 0.95;
+}
+
+/* Big touch area for the slider */
+.rotY-wrap {
+  position: relative;
+  width: 48px;
+  height: 200px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+
+  /* Critical: ensure slider grabs interactions and blocks scene drag beneath */
+  pointer-events: auto;
+  touch-action: none;
+  overflow: visible;
+}
+
+/* The vertical rail (full height) */
+.rotY-rail {
+  position: absolute;
+  left: 50%;
+  transform: translateX(-50%);
+  width: 4px;
+  height: 100%;
+  background: rgba(255, 255, 255, 0.35);
+  border-radius: 2px;
+  pointer-events: none; /* visual only */
+}
+
+/* The knob — centered on the rail */
+.rotY-knob {
+  position: absolute;
+  left: 50%;
+  transform: translate(-50%, -50%); /* perfectly centered */
+  top: 50%;
+  width: 24px;
+  height: 24px;
+  border-radius: 50%;
+  background: #ffffff;
+  box-shadow: 0 2px 8px rgba(0,0,0,.35);
+
+  will-change: top;
+  pointer-events: none;   /* moved by JS, wrapper handles input */
+}
+
+/* Input range is hidden (we use it only to store the numeric value) */
+.ar-ui input[type="range"].rotY {
+  position: absolute;
+  opacity: 0;
+  pointer-events: none;
+  width: 0;
+  height: 0;
+}
+
+/* Degree label below slider */
+.ar-ui .val {
+  font-size: 12px;
+  opacity: 0.95;
+}
+
+/* ===========================
+   Optional: container hints
+   =========================== */
+/* If you mount the canvas in a custom container (e.g., #my-ar), you can set a min height */
+#ar-mount-fallback {
+  position: relative;
+  width: 100%;
+  min-height: 70vh;        /* can be overridden inline on your site */
+  touch-action: manipulation;
+  -webkit-tap-highlight-color: transparent;
+}
+
+/* Make sure the canvas fills its mount container */
+#ar-mount-fallback > #application-canvas,
+#application-canvas {
+  position: absolute;
+  inset: 0;
+  width: 100%;
+  height: 100%;
+  display: block;
+}