#openmb2 { position: relative; width: 100%; max-width: 1024px; aspect-ratio: 4 / 3; margin: 0 auto; background: #000; }
#openmb2 canvas { display: block; outline: none; width: 100%; height: 100%; background: #000; }
#openmb2-start { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center;
                 justify-content: center; gap: 12px; color: #fff; background: rgba(0, 0, 0, 0.75); cursor: pointer; font-family: sans-serif; }
#openmb2-start[hidden] { display: none; }
#openmb2-start b { font-size: 28px; color: #ff0; }
#openmb2-bar { width: 50%; height: 6px; background: #333; }
#openmb2-bar div { width: 0; height: 100%; background: #6af; }