html, body { margin: 0; width: 100%; height: 100%; background: #fff; }
body { overscroll-behavior: none; }
#splash { position: fixed; inset: 0; display: flex; align-items: center; justify-content: center; background: #fff; }
#splash img { object-fit: contain; }
#startup-error { max-width: 360px; margin: 72px auto; padding: 24px; font: 16px/1.5 system-ui, sans-serif; color: #000; }
#startup-error h1 { font-size: 24px; }
#startup-error button { padding: 12px 24px; border: 0; border-radius: 6px; background: #50c878; color: #000; font: inherit; cursor: pointer; }
.startup-overlay { position: fixed; inset: 0; z-index: 2147483647; background: #fff; }