html, body { height: 100%; margin: 0; }
body { font-family: system-ui, -apple-system, "Segoe UI", sans-serif; background: #111; color: #eee; }

.top {
  display: flex; gap: 12px; align-items: center;
  padding: 10px 12px; border-bottom: 1px solid #2a2a2a;
  position: sticky; top: 0; background: rgba(17,17,17,0.9); backdrop-filter: blur(6px);
  z-index: 10;
}
#startBtn { padding: 8px 12px; cursor: pointer; }
.info { display: flex; gap: 14px; flex-wrap: wrap; align-items: baseline; font-size: 14px; }
.hint { opacity: 0.7; }

/* ここが重要：mainを固定高にしない */
main { padding: 12px; }

.stack { display: grid; gap: 32px; }

/* 3つのパノラマ */
.pano {
  height: 40vh;
  width: 100%;
  background-repeat: repeat-x;
  background-size: auto 100%;
  background-position: 0px 50%;
  cursor: grab;
  border: 1px solid #2a2a2a;
}
.pano.dragging { cursor: grabbing; }