:root {
  --bg: #0b0c0e;
  --surface: #141619;
  --surface-2: #1b1e22;
  --line: #262a30;
  --ink: #f3f1ec;
  --sub: #b9bcc2;
  --muted: #7d828b;
  --lime: #c8f53a;
  --orange: #ff6a2b;
  --display: "Unbounded", "Arial Black", Arial, sans-serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  padding: 0 1.25rem;
}
body > * { max-width: 78rem; margin-inline: auto; }
a { color: var(--lime); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, p { margin: 0; }
:focus-visible { outline: 2px solid var(--lime); outline-offset: 2px; }

/* Header */
.top {
  display: flex; justify-content: space-between; align-items: flex-start; gap: 2rem; flex-wrap: wrap;
  padding: 2.2rem 0 1.4rem;
}
.kicker { font: 500 0.72rem var(--mono); color: var(--lime); text-transform: uppercase; letter-spacing: 0.08em; }
h1 {
  font: 800 clamp(1.8rem, 4.5vw, 3rem)/1 var(--display); text-transform: uppercase; letter-spacing: -0.03em;
  margin: 0.6rem 0 0.9rem;
}
h1 span { color: #3a3e45; }
.sub { color: var(--sub); max-width: 44rem; }
.links { display: flex; gap: 1rem; font: 600 0.85rem var(--mono); padding-top: 0.3rem; }

/* Controls */
.controls {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem 1rem;
  padding: 0.8rem 1rem; margin-bottom: 1rem;
  background: var(--surface); border: 1px solid var(--line); border-radius: 0.9rem;
  font: 500 0.8rem var(--mono); color: var(--muted);
}
.controls label { display: inline-flex; align-items: center; gap: 0.45rem; }
select, input, button {
  font: 500 0.8rem var(--mono); color: var(--ink);
  background: var(--surface-2); border: 1px solid var(--line); border-radius: 0.5rem;
  padding: 0.4rem 0.6rem;
}
input { width: 5.5rem; }
button { cursor: pointer; font-weight: 700; }
button:hover { border-color: var(--ink); }
#train { background: var(--lime); color: #111; border-color: var(--lime); min-width: 11.5rem; }
#train:not(.on) { background: var(--orange); border-color: var(--orange); }

/* Grid */
.grid {
  display: grid; gap: 1rem;
  grid-template-columns: minmax(0, 2.3fr) minmax(0, 1fr);
  grid-template-areas:
    "arena hud"
    "charts charts"
    "nn fit"
    "board board";
}
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 0.9rem; padding: 0.9rem; min-width: 0; }
.panel h2 { font: 700 0.72rem var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 0.6rem; }
.arena-panel { grid-area: arena; padding: 0; overflow: hidden; }
.hud-panel { grid-area: hud; }
.charts-panel { grid-area: charts; padding: 0.4rem; }
.nn-panel { grid-area: nn; }
.fit-panel { grid-area: fit; }
.board-panel { grid-area: board; }
canvas { display: block; width: 100%; }
#arena { height: 300px; }
#charts { height: 280px; }
#nn { height: 280px; }
#fitness { height: 220px; }
#hud {
  margin: 0; font: 500 0.82rem/1.65 var(--mono); color: var(--sub); white-space: pre; overflow-x: auto;
}
.note { font-size: 0.78rem; color: var(--muted); margin-top: 0.6rem; }

/* Scoreboard */
.board-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.6rem; }
.board-head h2 { margin: 0; }
#bench { background: var(--lime); color: #111; border-color: var(--lime); }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font: 0.8rem var(--mono); min-width: 44rem; }
th { text-align: left; color: var(--muted); font-weight: 500; padding: 0.45rem 0.6rem; border-bottom: 1px solid var(--line); }
td { padding: 0.4rem 0.6rem; color: var(--sub); }
tr.first td { border-top: 1px solid var(--line); }
tr.champ td:nth-child(2) { color: var(--lime); font-weight: 700; }
td.best { color: var(--ink); font-weight: 700; background: rgba(200, 245, 58, 0.08); }

/* About */
.about { padding: 2.5rem 0 1rem; }
.about > h2 { font: 800 1.4rem var(--display); text-transform: uppercase; letter-spacing: -0.02em; margin-bottom: 1.2rem; }
.cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); gap: 1.4rem; }
.cols h3 { font: 700 0.8rem var(--mono); color: var(--lime); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.4rem; }
.cols p { color: var(--sub); font-size: 0.9rem; }
.foot { padding: 2rem 0 3rem; border-top: 1px solid var(--line); margin-top: 2rem; font: 0.75rem var(--mono); color: var(--muted); }

@media (max-width: 860px) {
  .grid { grid-template-columns: minmax(0, 1fr); grid-template-areas: "arena" "hud" "charts" "nn" "fit" "board"; }
  #arena { height: 260px; }
  body { padding: 0 1rem; }
}