:root{color-scheme:dark}body{margin:0;font-family:-apple-system,system-ui,sans-serif;background:#111;color:#eee}.card{padding:1.25rem;max-width:640px;margin:0 auto}button{font-size:1rem;padding:.6rem 1rem;border:0;border-radius:.6rem;background:#2d7;color:#042;cursor:pointer}a{color:#6cf}input{font-size:1rem;padding:.6rem;border-radius:.6rem;border:1px solid #444;background:#1b1b1b;color:#eee;width:100%;box-sizing:border-box;margin:.4rem 0}.err{color:#f77}.book{padding:.8rem;border:1px solid #333;border-radius:.8rem;margin:.5rem 0}.bar{height:6px;background:#333;border-radius:3px;overflow:hidden;margin:.4rem 0}.bar>i{display:block;height:100%;background:#2d7}.row{display:flex;gap:.6rem;align-items:center}.player button{font-size:1.5rem}