:root {
  --bg-a: #0f2027;
  --bg-b: #203a43;
  --bg-c: #2c5364;
  --panel: rgba(13, 29, 34, 0.76);
  --panel-border: rgba(255, 255, 255, 0.1);
  --light-square: #d8c6a3;
  --dark-square: #355c63;
  --human: #d34f3f;
  --human-king: #ef9071;
  --ai: #264f8a;
  --ai-king: #76a8ef;
  --target: #ffd166;
  --movable: #8ecae6;
  --text: #f8f5ef;
  --muted: #c7d3d6;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Gill Sans", "Trebuchet MS", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 640px at 12% -6%, rgba(255, 209, 102, 0.22), transparent 65%),
    radial-gradient(1100px 700px at 90% 110%, rgba(66, 184, 131, 0.2), transparent 64%),
    linear-gradient(130deg, var(--bg-a), var(--bg-b), var(--bg-c));
}

.app-shell {
  width: min(1180px, 95vw);
  margin: 24px auto 32px;
  display: grid;
  gap: 18px;
}

.hero {
  padding: 18px 20px 8px;
}

.eyebrow {
  margin: 0;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--target);
  font-size: 0.78rem;
  font-family: "Franklin Gothic Medium", "Arial Narrow", sans-serif;
}

h1 {
  margin: 8px 0 0;
  font-family: "Franklin Gothic Medium", "Arial Narrow", sans-serif;
  font-size: clamp(1.7rem, 2.6vw, 2.5rem);
  line-height: 1.1;
}

.subtitle {
  margin: 10px 0 0;
  max-width: 78ch;
  color: var(--muted);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.metric {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  padding: 14px 16px;
  backdrop-filter: blur(3px);
}

.metric.pride {
  background:
    linear-gradient(145deg, rgba(255, 209, 102, 0.26), rgba(255, 209, 102, 0.06)),
    var(--panel);
}

.metric-label {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.metric-value {
  margin: 6px 0 0;
  font-family: "Franklin Gothic Medium", "Arial Narrow", sans-serif;
  font-size: clamp(2rem, 4vw, 3.3rem);
  line-height: 1;
  letter-spacing: 0.02em;
}

.metric-value.small {
  font-size: clamp(1.4rem, 2.4vw, 2.1rem);
}

.arena {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 16px;
}

.board-panel,
.side-panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 16px;
}

.status {
  margin: 0 0 12px;
  min-height: 1.45em;
  font-weight: 600;
  color: var(--target);
}

.board {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  grid-template-rows: repeat(8, minmax(0, 1fr));
  aspect-ratio: 1 / 1;
  width: min(76vw, 620px);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 18px 35px rgba(0, 0, 0, 0.24);
}

.cell {
  border: 0;
  margin: 0;
  padding: 0;
  display: grid;
  place-items: center;
  cursor: pointer;
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 0;
}

.cell.light {
  background: var(--light-square);
}

.cell.dark {
  background: var(--dark-square);
}

.cell.movable::after {
  content: "";
  width: 26%;
  aspect-ratio: 1 / 1;
  border: 2px solid var(--movable);
  border-radius: 50%;
  position: absolute;
  opacity: 0.9;
}

.cell.target::before {
  content: "";
  width: 35%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: rgba(255, 209, 102, 0.24);
  outline: 3px solid rgba(255, 209, 102, 0.7);
  position: absolute;
}

.cell.selected {
  outline: 4px solid rgba(255, 209, 102, 0.84);
  outline-offset: -4px;
}

.cell.captured-pending .piece {
  opacity: 0.34;
  filter: grayscale(0.7);
}

.piece {
  width: 72%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.3);
  position: relative;
  animation: pop-in 160ms ease-out;
}

.piece.human {
  background: radial-gradient(circle at 32% 26%, #ffd5cc 0%, var(--human) 54%, #8e2f24 100%);
}

.piece.ai {
  background: radial-gradient(circle at 32% 26%, #d7e7ff 0%, var(--ai) 58%, #17345b 100%);
}

.piece.king.human {
  background: radial-gradient(circle at 34% 24%, #ffe7e2 0%, var(--human-king) 56%, #b64e38 100%);
}

.piece.king.ai {
  background: radial-gradient(circle at 34% 24%, #ecf4ff 0%, var(--ai-king) 58%, #2f6eb2 100%);
}

.piece.king::after {
  content: "K";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: "Franklin Gothic Medium", "Arial Narrow", sans-serif;
  font-size: clamp(12px, 1.9vw, 16px);
  color: rgba(255, 255, 255, 0.95);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
}

.side-panel {
  display: grid;
  gap: 12px;
  align-content: start;
}

.btn {
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 0.95rem;
  font-family: "Franklin Gothic Medium", "Arial Narrow", sans-serif;
  cursor: pointer;
  transition: transform 120ms ease, background-color 120ms ease;
}

.btn:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-1px);
}

.btn.primary {
  border-color: rgba(255, 209, 102, 0.6);
  background: rgba(255, 209, 102, 0.22);
}

.telemetry {
  margin: 6px 0 0;
  display: grid;
  gap: 10px;
}

.telemetry div {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.telemetry dt {
  color: var(--muted);
  font-size: 0.9rem;
}

.telemetry dd {
  margin: 0;
  font-family: "Franklin Gothic Medium", "Arial Narrow", sans-serif;
  font-size: 1rem;
}

.rules h2 {
  margin: 2px 0 8px;
  font-size: 1rem;
  font-family: "Franklin Gothic Medium", "Arial Narrow", sans-serif;
}

.rules p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

@keyframes pop-in {
  from {
    transform: scale(0.9);
    opacity: 0.6;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

@media (max-width: 980px) {
  .metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .board {
    width: min(92vw, 560px);
    margin-inline: auto;
  }
}

@media (max-width: 560px) {
  .app-shell {
    width: min(96vw, 96vw);
  }

  .board-panel,
  .side-panel {
    padding: 12px;
  }

  .metric {
    padding: 10px 12px;
  }
}