:root {
  --bg: #f7f8fb;
  --surface: #ffffff;
  --text: #1a2333;
  --muted: #5a6a83;
  --border: #d2d9e6;
  --focus: #0058cc;
  --enabled: #0d8f4a;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #fafcff 0%, #eef3fb 100%);
}

.app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem;
  display: grid;
  gap: 1rem;
}

.controls,
.metrics,
.panes article {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 1rem;
}

.controls {
  display: grid;
  gap: 0.6rem;
}

.controls label {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  font-weight: 600;
}

.controls input:checked + * {
  color: var(--enabled);
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

button {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 999px;
  padding: 0.5rem 0.9rem;
  cursor: pointer;
}

textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
  font-family: Consolas, "Courier New", monospace;
}

button:focus-visible,
textarea:focus-visible,
input:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.panes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.7rem;
}

.metric {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.6rem;
  display: grid;
  gap: 0.2rem;
}

.metric span {
  color: var(--muted);
  font-size: 0.92rem;
}

#status {
  min-height: 1.4rem;
  margin: 0;
}

@media (max-width: 900px) {
  .panes {
    grid-template-columns: 1fr;
  }
}