:root {
  color-scheme: dark;
  --bg: #080c18;
  --panel: #0f1728;
  --surface: #151f34;
  --border: rgba(255, 255, 255, .12);
  --text: #f6f8ff;
  --muted: #9ca9c0;
  --blue: #6ecbff;
  --yellow: #ffd166;
  --red: #ff627f;
  --green: #55e6a5;
  font-family: Inter, system-ui, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; min-width: 300px; min-height: 100%; }
body {
  height: 100vh;
  overflow: hidden;
  color: var(--text);
  background: radial-gradient(circle at 85% 0, rgba(110, 203, 255, .13), transparent 30rem), var(--bg);
}
button, input, select { font: inherit; }
button, input[type=number], input[type=text], select {
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: .62rem;
  background: rgba(255, 255, 255, .055);
}
button { padding: .55rem .7rem; cursor: pointer; font-weight: 750; }
button:hover { background: rgba(255, 255, 255, .11); }
button:disabled { cursor: default; opacity: .45; }
button:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }
h1, h2, h3, p { margin: 0; }
header {
  display: flex;
  height: 4.25rem;
  padding: .7rem 1.15rem;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  background: rgba(8, 12, 24, .9);
}
header p { color: var(--blue); font-size: .62rem; font-weight: 850; letter-spacing: .12em; text-transform: uppercase; }
main {
  display: grid;
  height: calc(100vh - 4.25rem);
  min-height: 0;
  grid-template-columns: 21.5rem minmax(0, 1fr);
}
#controls {
  height: 100%;
  padding: .8rem;
  overflow: auto;
  border-right: 1px solid var(--border);
  background: var(--panel);
}
.panel-head, .actions, .metric-head, footer, .legend, .run-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .55rem;
}
.actions { display: grid; grid-template-columns: repeat(2, 1fr); }
.actions button:last-child { grid-column: 1 / -1; }
.primary { color: #061620; background: linear-gradient(135deg, var(--blue), #a899ff); }
#controls section {
  margin-top: .7rem;
  padding: .7rem;
  border: 1px solid var(--border);
  border-radius: .8rem;
  background: rgba(255, 255, 255, .025);
}
#controls h3 { margin-bottom: .5rem; font-size: .78rem; }
#controls label {
  display: grid;
  margin-top: .5rem;
  gap: .28rem;
  color: var(--muted);
  font-size: .67rem;
}
#controls label:first-of-type { margin-top: 0; }
#controls select, #controls input[type=number], #controls input[type=text] {
  width: 100%;
  min-height: 2.1rem;
  padding: .35rem .48rem;
}
#controls input[type=range] { width: 100%; accent-color: var(--blue); }
#controls output { color: var(--blue); font-weight: 800; }
.check { display: flex !important; align-items: center; gap: .4rem !important; }
.seed-row { display: grid; grid-template-columns: 1fr auto; gap: .4rem; }
.workspace {
  display: grid;
  min-width: 0;
  min-height: 0;
  padding: .75rem;
  grid-template-rows: auto minmax(0, 1fr) auto;
  gap: .7rem;
}
.metrics { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .6rem; }
.metrics article {
  min-width: 0;
  padding: .55rem .7rem;
  border: 1px solid var(--border);
  border-radius: .78rem;
  background: var(--surface);
}
.metrics article[hidden] { display: none; }
.metrics:has(article[hidden]) { grid-template-columns: 1fr; }
.metric-head strong { font-size: .78rem; }
.metric-head span { color: var(--blue); font-size: .64rem; }
.metric-grid { display: grid; margin-top: .38rem; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .35rem; }
.metric-grid span { color: var(--muted); font-size: .58rem; white-space: nowrap; }
.metric-grid b { display: block; margin-top: .08rem; color: var(--text); font-size: .7rem; }
.canvas-wrap {
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: #0a1020;
}
canvas { display: block; width: 100%; height: 100%; }
footer { min-width: 0; color: var(--muted); font-size: .66rem; }
.legend { justify-content: flex-start; flex-wrap: wrap; }
.legend span { white-space: nowrap; }
.legend span::before {
  display: inline-block;
  width: .62rem;
  height: .62rem;
  margin-right: .28rem;
  border-radius: .18rem;
  content: "";
}
.compare-key::before { background: var(--yellow); }
.swap-key::before { background: var(--red); }
.write-key::before { background: var(--blue); }
.sorted-key::before { background: var(--green); }
#status { color: var(--blue); }
.mobile { display: none; }
.backdrop { position: fixed; z-index: 30; inset: 0; background: rgba(0, 0, 0, .58); }

@media (max-width: 48rem) {
  body { height: auto; min-height: 100vh; overflow: auto; }
  header { height: 4rem; }
  .mobile { display: block; }
  main { display: block; height: auto; min-height: calc(100vh - 4rem); }
  #controls {
    position: fixed;
    z-index: 40;
    top: 0;
    bottom: 0;
    left: 0;
    width: min(92vw, 22rem);
    height: auto;
    transform: translateX(-105%);
    transition: transform .2s;
  }
  #controls.open { transform: none; }
  .workspace { min-height: calc(100vh - 4rem); grid-template-rows: auto minmax(58vh, 1fr) auto; }
  .metrics { grid-template-columns: 1fr; }
  .metric-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  footer { align-items: flex-start; flex-direction: column; }
  .run-status { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  #controls { transition-duration: .01ms !important; }
}