:root {
  --accent: #111827;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: #f8fafc;
  color: #0f172a;
}

header {
  background: var(--accent);
  color: #fff;
  padding: 1.5rem 2rem;
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.5rem;
}

header p {
  margin: 0;
  opacity: 0.85;
  font-size: 0.85rem;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 2rem 3rem;
}

.content-block p {
  line-height: 1.5;
}

.content-block code {
  background: #e2e8f0;
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
  font-size: 0.85em;
}

.controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.5rem 0;
  flex-wrap: wrap;
}

.controls button {
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
  border: 1px solid #cbd5e1;
  background: #fff;
  cursor: pointer;
}

.controls button:hover {
  background: #f1f5f9;
}

.debug-panel {
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  padding: 1rem;
  background: #fff;
}

.debug-panel h2 {
  margin-top: 0;
  font-size: 1rem;
}

#submit-status {
  font-weight: 600;
  margin-bottom: 0.75rem;
}

#submit-status[data-ok="true"] {
  color: #059669;
}

#submit-status[data-ok="false"] {
  color: #dc2626;
}

#debug-json {
  max-height: 360px;
  overflow: auto;
  background: #0f172a;
  color: #e2e8f0;
  padding: 0.75rem;
  border-radius: 6px;
  font-size: 0.75rem;
  white-space: pre-wrap;
  word-break: break-word;
}