*{box-sizing:border-box}body{margin:0;font-family:Arial;background:#f4f5f7;color:#111}
.topbar{position:sticky;top:0;background:#fff;padding:10px;border-bottom:1px solid #ddd;display:flex;gap:8px;justify-content:space-between;align-items:center;flex-wrap:wrap}
.topbar nav a{margin-right:8px;text-decoration:none;color:#111;font-size:14px}
.container{max-width:480px;margin:0 auto;padding:10px}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.card{background:#fff;padding:12px;border-radius:10px;border:1px solid #e6e6e6}
.btn{display:inline-block;background:#111;color:#fff;text-decoration:none;border:none;border-radius:10px;padding:10px 12px;cursor:pointer}
.actions{display:flex;gap:8px;margin-top:10px}
.stack{display:flex;flex-direction:column;gap:8px}
.input{width:100%;padding:10px;border:1px solid #ddd;border-radius:10px;background:#fff}
.login-card{max-width:360px;margin:60px auto;background:#fff;padding:16px;border-radius:12px;border:1px solid #ddd}
.err{color:#b00020}.muted{color:#666;font-size:12px}
.profit{background:#e8f5e9;padding:10px;border-radius:10px}
@media(max-width:480px){.grid{grid-template-columns:1fr 1fr}}