:root {
  --bg: #0a0e14;
  --panel: #10161f;
  --edge: #1e2a3a;
  --accent: #58a6c8;
  --accent-hot: #7fc4e0;
  --text: #c9d4de;
  --dim: #6b7a89;
  --ok: #6fc98a;
  --err: #d97a6c;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: radial-gradient(ellipse at 50% -20%, #16202e 0%, var(--bg) 60%);
  color: var(--text);
  font: 15px/1.5 "Segoe UI", system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
body.wide { align-items: flex-start; padding-top: 40px; }
.panel {
  width: 100%;
  max-width: 420px;
  background: var(--panel);
  border: 1px solid var(--edge);
  border-top: 2px solid var(--accent);
  padding: 32px 36px 28px;
}
body.wide .panel { max-width: 720px; }
h1 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent-hot);
  margin-bottom: 4px;
}
.sub { color: var(--dim); font-size: 13px; margin-bottom: 24px; }
label {
  display: block;
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--dim);
  margin: 16px 0 4px;
}
input {
  width: 100%;
  background: #0c1219;
  border: 1px solid var(--edge);
  color: var(--text);
  padding: 9px 12px;
  font-size: 15px;
  outline: none;
}
input:focus { border-color: var(--accent); }
input.center { letter-spacing: 2px; text-transform: uppercase; text-align: center; }
button {
  padding: 11px 18px;
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent-hot);
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  cursor: pointer;
  transition: background .15s;
}
button.block { width: 100%; margin-top: 24px; }
button:hover:not(:disabled) { background: rgba(88, 166, 200, .12); }
button:disabled { opacity: .4; cursor: default; }
button.small { padding: 4px 10px; font-size: 11px; letter-spacing: 1px; }
.row { display: flex; gap: 12px; align-items: flex-end; }
.row .grow { flex: 1; }
.msg { margin-top: 16px; font-size: 14px; min-height: 21px; }
.msg.ok { color: var(--ok); }
.msg.err { color: var(--err); }
.hidden { display: none; }
.status { font-size: 12px; color: var(--dim); margin-bottom: 18px; }
.status .dot {
  display: inline-block; width: 8px; height: 8px; border-radius: 50%;
  background: var(--dim); margin-right: 6px;
}
.status.ok .dot { background: var(--ok); }
.status.err .dot { background: var(--err); }
table { width: 100%; border-collapse: collapse; margin-top: 20px; font-size: 13px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--edge); }
th {
  font-size: 11px; letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--dim); font-weight: 600;
}
td.code { font-family: Consolas, monospace; letter-spacing: 1px; white-space: nowrap; }
td .used { color: var(--dim); }
td .free { color: var(--ok); }
.newcode {
  margin-top: 16px; padding: 12px 14px; background: #0c1219;
  border: 1px dashed var(--accent); font-family: Consolas, monospace;
  font-size: 18px; letter-spacing: 2px; text-align: center; cursor: pointer;
}