:root {
  --bg: #f9fafb;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --accent: #2563eb;
}
html,
body {
  margin: 0;
  font-family:
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Inter,
    Arial;
  background: var(--bg);
  color: var(--text);
}
.container {
  max-width: 980px;
  margin: 28px auto;
  padding: 0 16px;
}
h1 {
  font-size: 1.4rem;
  margin: 0 0 12px;
}
.card {
  background: var(--card);
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}
label {
  font-size: 0.9rem;
  color: var(--muted);
  display: block;
  margin-bottom: 6px;
}
input[type='number'] {
  width: 100%;
  box-sizing: border-box;
  padding: 10px 12px;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  background: #fff;
  color: var(--text);
}
button {
  border: none;
  background: var(--accent);
  color: #fff;
  padding: 8px 12px;
  border-radius: 10px;
  cursor: pointer;
}
button.ghost {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}
button.danger {
  background: #dc2626;
}
.pair {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 10px;
  margin-top: 8px;
}
pre {
  background: #0b1020;
  color: #e5e7eb;
  padding: 12px;
  border-radius: 10px;
  overflow: auto;
  max-height: 520px;
  border: 1px solid #111827;
  white-space: pre-wrap;
}
.hr {
  height: 1px;
  background: #e5e7eb;
  margin: 16px 0;
}
.row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}
.right {
  margin-left: auto;
}