:root {
  --ink: #162a2c;
  --ink-soft: #506567;
  --paper: #f5f7f4;
  --surface: #ffffff;
  --line: #d7dfdb;
  --accent: #1b7f79;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 16px;
  padding: 16px;
}

.plot-grid {
  min-width: 0;
  display: grid;
  grid-template-rows: 1fr 1fr;
  gap: 16px;
}

.plot {
  min-height: 360px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow: auto;
  max-height: calc(100vh - 32px);
}

.controls-header,
.control-group {
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 14px;
}

.controls-header h1,
.control-group h2 {
  margin: 0;
  font-size: 1rem;
}

.controls-header p {
  min-height: 1.25rem;
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.control-group {
  display: grid;
  gap: 12px;
}

label {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 10px;
  color: var(--ink-soft);
  font-size: 0.86rem;
}

input,
select {
  grid-column: 1 / -1;
  width: 100%;
  accent-color: var(--accent);
}

select {
  min-height: 34px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
}

output {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .controls {
    max-height: none;
  }
}