:root {
  --ink: #1a1d21;
  --muted: #5b6470;
  --accent: #2563eb;
  --line: #e2e6ec;
  --card: #ffffff;
  --bg: #f6f7f9;
  --good: #15803d;
}
* { box-sizing: border-box; }
body {
  font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  margin: 0;
  line-height: 1.5;
}
.wrap { max-width: 680px; margin: 0 auto; padding: 32px 20px 64px; }
h1 { font-size: 24px; letter-spacing: -0.3px; margin: 0 0 4px; }
.sub { color: var(--muted); margin: 0 0 24px; }
a { color: var(--accent); }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 20px; margin-bottom: 16px;
}
label { display: block; font-weight: 600; font-size: 13px; margin: 14px 0 4px; }
label .opt { font-weight: 400; color: var(--muted); }
input, select, textarea {
  width: 100%; padding: 9px 11px; border: 1px solid var(--line); border-radius: 9px;
  font: inherit; background: #fff; color: var(--ink);
}
textarea { resize: vertical; }
.row { display: flex; gap: 12px; }
.row > div { flex: 1; }
.btn {
  display: inline-block; border: none; border-radius: 10px; padding: 11px 18px;
  font: inherit; font-weight: 600; cursor: pointer; background: var(--accent); color: #fff;
}
.btn:disabled { opacity: 0.5; cursor: default; }
.btn.secondary { background: #eef1f6; color: var(--ink); }
.btn-row { margin-top: 20px; display: flex; gap: 10px; align-items: center; }
.note { font-size: 12.5px; color: var(--muted); margin: 6px 0 0; }
.err { color: #b91c1c; font-size: 13px; margin-top: 10px; }
.ok { color: var(--good); font-size: 13px; margin-top: 10px; }
.out { margin-top: 18px; }
.out textarea { font-family: "SF Mono", Consolas, monospace; font-size: 12px; }
.agent-card {
  display: block; text-decoration: none; color: inherit;
  border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin-bottom: 10px; background: #fff;
}
.agent-card:hover { border-color: var(--accent); }
.agent-card .name { font-weight: 700; font-size: 16px; }
.agent-card .tag { color: var(--muted); font-size: 14px; margin-top: 2px; }
.agent-card .disc { color: var(--muted); font-size: 12px; margin-top: 8px; }
.seal-note { background: #f0f6ff; border: 1px solid #d6e4ff; border-radius: 10px; padding: 10px 12px; font-size: 12.5px; color: #1e3a8a; margin-top: 12px; }
.balance { margin-top: 12px; border-radius: 10px; padding: 10px 12px; font-size: 13.5px; }
.balance.ok { background: #f0fdf4; border: 1px solid #bbf7d0; color: #14532d; }
.balance.empty { background: #fef2f2; border: 1px solid #fecaca; color: #991b1b; }
.success { margin-top: 14px; border-radius: 10px; padding: 12px 14px; font-size: 13.5px; }
.success.ok { background: #f0fdf4; border: 1px solid #bbf7d0; color: #14532d; }
#code { letter-spacing: 1px; text-transform: uppercase; }
@media (max-width: 520px) {
  .row { flex-direction: column; gap: 0; }
  .wrap { padding: 20px 14px 48px; }
}