:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --bg: #fafafa;
  --border: #d0d0d0;
  --accent: #16a34a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e8e8e8;
    --bg: #16181c;
    --border: #3a3d42;
    --accent: #4ade80;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 1.5rem;
  max-width: 48rem;
  margin-inline: auto;
  font-family: system-ui, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.5;
}

h1 {
  font-size: 1.25rem;
}

code {
  font-family: ui-monospace, monospace;
  font-size: 0.9em;
}

section {
  margin-block: 1.5rem;
  padding-block: 1rem;
  border-top: 1px solid var(--border);
}

button {
  font: inherit;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button:not(:disabled):hover {
  border-color: var(--accent);
}

#status {
  margin-inline-start: 0.75rem;
  font-family: ui-monospace, monospace;
}

select {
  font: inherit;
  padding: 0.35rem;
}

canvas#scope {
  width: 100%;
  max-width: 640px;
  height: 160px;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: black;
}

fieldset.module-controls {
  margin-block-end: 1rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
}

.control-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-block: 0.4rem;
}

.control-label {
  min-width: 6rem;
  font-family: ui-monospace, monospace;
  font-size: 0.85rem;
}

input[type="range"] {
  flex: 1;
}

input[type="range"].bipolar {
  accent-color: var(--accent);
}

#diagnostics {
  list-style: none;
  padding: 0;
  font-family: ui-monospace, monospace;
  font-size: 0.85rem;
}

.diagnostic-ok {
  color: var(--accent);
}

.diagnostic-warning {
  color: #d97706;
}

.diagnostic-error {
  color: #dc2626;
}