*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --border: #2d3a4f;
  --text: #e7ecf3;
  --muted: #8b9cb3;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #22c55e;
  --error: #f87171;
  --radius: 10px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.page {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.header {
  margin-bottom: 2rem;
}

.header h1 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  font-weight: 600;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: flex-end;
}

.field {
  flex: 1 1 180px;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.field-count {
  flex: 0 1 100px;
}

label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

select,
input[type="number"] {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-size: 1rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}

select:focus,
input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.btn-primary {
  flex: 0 0 auto;
  padding: 0.65rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.error {
  margin: 1rem 0 0;
  padding: 0.75rem 1rem;
  color: var(--error);
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.3);
  border-radius: 6px;
}

.results {
  margin-top: 2rem;
}

.results h2 {
  margin: 0 0 1rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--muted);
}

.cards {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
}

.card-name {
  margin: 0 0 0.75rem;
  font-size: 1.15rem;
  font-weight: 600;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.5rem 1rem;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}

.card-grid dt {
  margin: 0;
  color: var(--muted);
  font-size: 0.75rem;
  text-transform: uppercase;
}

.card-grid dd {
  margin: 0.15rem 0 0;
}

.card-address {
  margin: 0 0 0.75rem;
  padding: 0.6rem 0.75rem;
  font-size: 0.9rem;
  background: var(--bg);
  border-radius: 6px;
  word-break: break-word;
}

.btn-copy {
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
  font-family: inherit;
  color: var(--text);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
}

.btn-copy:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-copy.copied {
  border-color: var(--success);
  color: var(--success);
}

@media (max-width: 520px) {
  .controls {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-primary {
    width: 100%;
  }
}