:root {
  --bg: #0f1115;
  --card: #171a21;
  --border: #262b36;
  --text: #e7e9ee;
  --muted: #9aa2b1;
  --accent: #26a17b; /* USDT green */
  --error: #e5484d;
  --success: #2fbf71;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
}
.navbar .brand { color: var(--accent); font-weight: 700; text-decoration: none; font-size: 1.1rem; }
.nav-links a { color: var(--text); text-decoration: none; margin-left: 16px; }
.nav-links span { color: var(--muted); }
.container { max-width: 720px; margin: 0 auto; padding: 24px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 20px;
}
h1, h2 { margin-top: 0; }
label { display: block; margin-bottom: 14px; font-size: 0.9rem; color: var(--muted); }
input {
  width: 100%;
  padding: 10px 12px;
  margin-top: 6px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0f1115;
  color: var(--text);
  font-size: 1rem;
}
.btn {
  background: var(--accent);
  color: #06120d;
  border: none;
  padding: 12px 20px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  font-size: 1rem;
}
.btn:hover { opacity: 0.9; }
.alert { padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; font-size: 0.9rem; }
.alert-error { background: rgba(229,72,77,0.15); color: var(--error); border: 1px solid var(--error); }
.alert-success { background: rgba(47,191,113,0.15); color: var(--success); border: 1px solid var(--success); }
.alert-info { background: rgba(38,161,123,0.15); color: var(--accent); border: 1px solid var(--accent); }
.balance-box { display: flex; flex-direction: column; gap: 4px; }
.balance-box span { color: var(--muted); font-size: 0.85rem; }
.balance-box strong { font-size: 1.8rem; color: var(--accent); }
.address-box {
  font-family: monospace;
  background: #0f1115;
  border: 1px dashed var(--accent);
  padding: 12px;
  border-radius: 8px;
  word-break: break-all;
}
.hint { color: var(--muted); font-size: 0.85rem; }
.table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.table th, .table td { text-align: left; padding: 8px; border-bottom: 1px solid var(--border); }
.mono { font-family: monospace; }
.footer { text-align: center; color: var(--muted); padding: 24px; font-size: 0.8rem; }