* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; font-family: system-ui, -apple-system, Segoe UI, Roboto, 'Helvetica Neue', Arial, 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif; background: #0b0b0f; color: #fff; }
#app { position: relative; width: 100%; height: 100%; }
#stage { position: relative; display: flex; align-items: center; justify-content: center; width: 100%; height: 100%; overflow: hidden; }
#stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 1; }
#controls { position: absolute; top: 20px; right: 20px; display: flex; gap: 10px; z-index: 100; }
#tips { position: absolute; bottom: 20px; right: 20px; padding: 0; text-align: center; opacity: 0.9; display: flex; flex-direction: column; align-items: center; gap: 8px; z-index: 20; }
#qr { width: 140px; height: 140px; border-radius: 8px; border: 1px solid #343a40; background: #111; object-fit: cover; }
.status { margin-top: 8px; font-size: 14px; color: #cfd3dc; }
.btn { padding: 10px 16px; border: none; border-radius: 8px; background: #ffd700; color: #111; font-weight: 600; cursor: pointer; box-shadow: 0 6px 20px rgba(255,215,0,0.25); }
.btn.hidden { display: none; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }