:root {
  --bg: #0b0f17;
  --panel: #121826;
  --line: #263046;
  --text: #e3e8f2;
  --muted: #98a3b8;
  --accent: #f2a65a;
  --button: #1d2638;
  --button-hover: #273349;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, 'Segoe UI', sans-serif;
}

header,
footer {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px;
}

h1 {
  margin: 8px 0 4px;
  font-size: 1.8rem;
  letter-spacing: 0.02em;
}

.subtitle,
footer {
  color: var(--muted);
  max-width: 72ch;
}

footer {
  font-size: 0.85rem;
}

a {
  color: var(--accent);
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 16px;
  align-items: start;
}

@media (max-width: 860px) {
  main {
    grid-template-columns: minmax(0, 1fr);
  }
}

.canvas-wrap {
  width: 100%;
  aspect-ratio: 16 / 9;
  min-height: 260px;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: pan-y;
}

#plot {
  cursor: crosshair;
  touch-action: none;
}

#plot.launching {
  cursor: cell;
}

#plot.over-charge {
  cursor: grab;
}

#plot.dragging {
  cursor: grabbing;
}

.stage-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}

.status {
  margin: 0;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.hint,
.note {
  color: var(--muted);
  font-size: 0.85rem;
}

.note {
  margin: 4px 0 0;
}

.probe {
  margin: 8px 0 0;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  font-variant-numeric: tabular-nums;
  min-height: 2.3em;
}

.segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  margin: 6px 0;
}

.segmented label {
  display: flex;
  gap: 6px;
  align-items: center;
}

.segmented input {
  accent-color: var(--accent);
}

.buttons.spaced {
  margin-top: 10px;
}

button:disabled {
  opacity: 0.45;
  cursor: default;
}

.controls fieldset {
  border: 1px solid var(--line);
  border-radius: 8px;
  margin: 0 0 12px;
  padding: 6px 10px 10px;
  background: var(--panel);
}

legend {
  color: var(--accent);
  padding: 0 4px;
}

.row {
  display: block;
  margin: 4px 0;
}

select {
  display: block;
  width: 100%;
  margin-top: 2px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 5px 7px;
  font: inherit;
}

.slider {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  margin: 8px 0 0;
}

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

.slider[hidden] {
  display: none;
}

output {
  grid-row: 1;
  grid-column: 2;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.check {
  display: flex;
  gap: 8px;
  align-items: center;
  margin: 6px 0;
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

button {
  background: var(--button);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 12px;
  font: inherit;
  cursor: pointer;
}

button:hover {
  background: var(--button-hover);
}

button[aria-pressed='true'] {
  border-color: var(--accent);
  color: var(--accent);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

kbd {
  font-family: ui-monospace, 'Cascadia Code', Consolas, monospace;
  font-size: 0.85em;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0 4px;
}