:root {
  --bg: #0b1014;
  --bg-elev: #121a21;
  --panel: #162028;
  --line: #2a3a46;
  --text: #dce6ec;
  --muted: #8aa0ae;
  --teal: #3ee0b4;
  --teal-dim: rgba(62, 224, 180, 0.14);
  --amber: #f5c542;
  --danger: #ff6b6b;
  --ok: #3ee0b4;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(62, 224, 180, 0.08), transparent 50%),
    radial-gradient(900px 400px at 100% 0%, rgba(245, 197, 66, 0.06), transparent 45%),
    var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, sans-serif;
}

body {
  padding: 28px 20px 40px;
}

.wrap {
  max-width: 980px;
  margin: 0 auto;
}

.top {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-end;
  margin-bottom: 22px;
}

h1 {
  margin: 0 0 6px;
  font-size: 28px;
  letter-spacing: 0.02em;
  font-weight: 650;
}

.sub {
  color: var(--muted);
  font-size: 14px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-elev);
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

.badge b {
  color: var(--teal);
  font-weight: 650;
}

.grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 16px;
}

.card {
  background: linear-gradient(180deg, #1a242d 0%, var(--panel) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

.card h2 {
  margin: 0 0 14px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  font-weight: 600;
}

.row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
}

input[type="text"] {
  width: 100%;
  background: #0e151b;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 11px 12px;
  font: 15px/1.3 ui-monospace, "Cascadia Mono", Consolas, monospace;
  outline: none;
}

input[type="text"]:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px var(--teal-dim);
}

.actions {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

button {
  border: 0;
  border-radius: 12px;
  padding: 11px 16px;
  font-size: 14px;
  font-weight: 650;
  cursor: pointer;
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--teal);
  color: #06241b;
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}

.btn-amber {
  background: var(--amber);
  color: #2b2106;
}

.status {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 12px;
  background: #0e151b;
  border: 1px solid var(--line);
  color: var(--muted);
  min-height: 46px;
}

.status.ok {
  color: var(--ok);
  border-color: rgba(62, 224, 180, 0.35);
}

.status.err {
  color: var(--danger);
  border-color: rgba(255, 107, 107, 0.35);
}

.sn-box {
  text-align: center;
  padding: 18px 10px 8px;
}

.sn-label {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.sn-value {
  margin: 8px 0 4px;
  font: 700 42px/1.1 ui-monospace, "Cascadia Mono", Consolas, monospace;
  color: var(--amber);
  letter-spacing: 0.08em;
}

.meta {
  margin-top: 16px;
  display: grid;
  gap: 10px;
}

.meta-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  background: #0e151b;
  border-radius: 12px;
  border: 1px solid var(--line);
}

.meta-row span {
  color: var(--muted);
  font-size: 13px;
}

.meta-row b {
  font: 600 13px/1.4 ui-monospace, "Cascadia Mono", Consolas, monospace;
  color: var(--text);
  word-break: break-all;
  text-align: right;
}

.log {
  margin-top: 16px;
  grid-column: 1 / -1;
}

.log pre {
  margin: 0;
  max-height: 220px;
  overflow: auto;
  background: #0a1015;
  border-radius: 12px;
  padding: 12px 14px;
  font: 12px/1.45 ui-monospace, "Cascadia Mono", Consolas, monospace;
  color: #9db3c0;
  white-space: pre-wrap;
}

.hint,
.req {
  margin-top: 14px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.disclaimer {
  margin-top: 12px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(245, 197, 66, 0.35);
  background: rgba(245, 197, 66, 0.08);
  color: #e8d7a2;
  font-size: 12px;
  line-height: 1.5;
}

.procedure {
  margin-bottom: 16px;
}

.steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
  counter-reset: step;
}

.steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 12px;
  align-items: start;
  color: var(--text);
  font-size: 14px;
  line-height: 1.45;
}

.steps li::before {
  content: counter(step);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--teal-dim);
  color: var(--teal);
  font: 650 13px/28px "Segoe UI", system-ui, sans-serif;
  text-align: center;
}

.steps b {
  color: var(--amber);
  font-weight: 650;
}

@media (max-width: 820px) {
  .grid,
  .top {
    grid-template-columns: 1fr;
    display: grid;
  }

  .sn-value {
    font-size: 32px;
  }
}