:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;background:#0b1020;color:#e6ebff}.shell{max-width:820px;margin:0 auto;padding:20px;display:grid;gap:16px}.panel{background:#141b33;border:1px solid #27335b;border-radius:12px;padding:12px;display:grid;gap:8px}.list{display:grid;gap:8px}input,textarea,button{background:#0f162b;color:#e6ebff;border:1px solid #344572;border-radius:8px;padding:10px}button{cursor:pointer}pre{overflow-x:auto;background:#0f162b;border:1px solid #2c3a63;border-radius:8px;padding:10px}.error{color:#ffb4b4}