:root{color-scheme:dark;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{margin:0;background:#0f1115;color:#f2f4f8}a{color:#61dafb;text-decoration:none}.app-shell{min-height:100vh}.topbar{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.5rem;border-bottom:1px solid #2b2f3a;position:sticky;top:0;background:#151923}.topbar nav{display:flex;gap:1rem}.main-content{padding:1.5rem;max-width:980px;margin:0 auto}.ok{color:#7ff5a2}.error{color:#ff7f7f}.card{background:#171b25;border:1px solid #2f3647;border-radius:10px;padding:1rem;margin-bottom:1rem}