:root {
  color-scheme: light dark;
  --bg: #f6f7f9;
  --panel: #ffffff;
  --panel-soft: #eef2f5;
  --text: #17202a;
  --muted: #637182;
  --border: #d8e0e8;
  --accent: #0f766e;
  --accent-text: #ffffff;
  --alive: #0f766e;
  --grid: #d7e0e6;
  --dead: #fbfcfd;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101418;
    --panel: #171d23;
    --panel-soft: #202832;
    --text: #eef3f7;
    --muted: #a6b2bf;
    --border: #303a45;
    --accent: #2dd4bf;
    --accent-text: #061614;
    --alive: #2dd4bf;
    --grid: #2f3944;
    --dead: #0d1116;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
}

.app {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 22px;
}

.header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: 1.8rem;
  line-height: 1.1;
  letter-spacing: 0;
}

.status-pill {
  min-width: 84px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 800;
  text-align: center;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
}

.toolbar.secondary {
  margin-bottom: 14px;
}

button,
select,
input[type="range"] {
  font: inherit;
}

button,
select {
  min-height: 40px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel-soft);
  color: var(--text);
}

button {
  padding: 0 13px;
  cursor: pointer;
  font-weight: 800;
}

button:hover {
  border-color: var(--accent);
}

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

button.primary,
#startPauseBtn {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}

select {
  min-width: 210px;
  padding: 0 10px;
}

.field {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  color: var(--muted);
  font-weight: 800;
}

.field span {
  font-size: 0.9rem;
}

#speedSlider {
  width: 150px;
  accent-color: var(--accent);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 14px;
  align-items: start;
}

.board-wrap,
.side-panel {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
}

.board-wrap {
  padding: 10px;
}

#gameCanvas {
  display: block;
  width: 100%;
  max-width: 720px;
  aspect-ratio: 1;
  margin: 0 auto;
  border-radius: 6px;
  background: var(--dead);
  touch-action: none;
}

.side-panel {
  padding: 12px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 12px;
}

.stats div {
  min-height: 74px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel-soft);
}

.stats span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
}

.stats strong {
  display: block;
  font-size: 1.35rem;
  line-height: 1.1;
}

#graphCanvas {
  display: block;
  width: 100%;
  height: 180px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--dead);
}

.note {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 650;
  line-height: 1.45;
}

@media (max-width: 880px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .side-panel {
    width: 100%;
  }
}

@media (max-width: 560px) {
  .app {
    padding: 14px;
  }

  .header {
    align-items: stretch;
    flex-direction: column;
  }

  h1 {
    font-size: 1.45rem;
  }

  .toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  button,
  select,
  .field {
    width: 100%;
  }

  .field {
    justify-content: space-between;
  }

  #speedSlider {
    width: min(180px, 55%);
  }

  .stats {
    grid-template-columns: 1fr;
  }
}