:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400}body,html{margin:0;padding:0;width:100%;height:100%;background:#111;color:#fff;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif}.app-container{width:100vw;height:100vh;position:relative;overflow:hidden}.start-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:#000000d9;z-index:100;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff}.start-button{padding:16px 32px;font-size:20px;cursor:pointer;background:#4caf50;border:none;border-radius:8px;color:#fff;margin-top:20px;box-shadow:0 4px 10px #0000004d;transition:transform .1s}.start-button:hover{transform:scale(1.05);background:#45a049}.instructions{position:absolute;top:20px;left:20px;color:#fff;pointer-events:none;background:#00000080;padding:10px;border-radius:8px}.instructions h3{margin:0 0 5px}.instructions p{font-size:14px;opacity:.9;margin:0;line-height:1.5}