html, body { margin: 0; height: 100%; background: #111; color: #ddd; font: 16px system-ui, sans-serif; }
#gate { max-width: 32rem; margin: 20vh auto; padding: 0 1rem; text-align: center; }
#gate .warn { color: #f6b; }
#gate button { font: inherit; padding: .6rem 1.6rem; background: #e33; color: #fff; border: 0; cursor: pointer; }
#world { position: fixed; inset: 0; width: 100vw; height: 100vh; border: 0; }