*{box-sizing:border-box;margin:0;padding:0}
body{background:#0d1117;color:#e6edf3;font-family:system-ui,sans-serif;padding:16px;line-height:1.5}
.caixa{max-width:520px;margin:0 auto}
.card{background:#161b22;border:1px solid #30363d;border-radius:10px;padding:16px;margin-bottom:12px}
h1{font-size:22px;margin-bottom:4px}h2{font-size:16px;margin-bottom:10px;color:#7d8590}
input,select,button{width:100%;padding:11px;margin-top:8px;border-radius:8px;
  border:1px solid #30363d;background:#0d1117;color:#e6edf3;font-size:15px}
button{background:#238636;border-color:#238636;font-weight:600;cursor:pointer}
button.cinza{background:#21262d;border-color:#30363d}
button.vermelho{background:#da3633;border-color:#da3633}
.linha{display:flex;gap:8px;align-items:center;justify-content:space-between;
  padding:10px 0;border-bottom:1px solid #21262d}
.linha:last-child{border:0}
.linha button{width:auto;margin:0;padding:6px 12px;font-size:13px}
.coins{font-size:32px;font-weight:700;color:#3fb950}
.aviso{padding:10px;border-radius:8px;margin-top:10px;font-size:14px;display:none}
.erro{background:#3d1418;color:#ff7b72;display:block}
.certo{background:#12261a;color:#3fb950;display:block}
a{color:#58a6ff}small{color:#7d8590}