* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #e2e8f0;
  min-height: 100vh;
}

.app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px;
}

header { text-align: center; margin-bottom: 12px; }

h1 {
  margin: 0 0 6px;
  font-size: 26px;
  background: linear-gradient(135deg, #60a5fa, #a78bfa);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle { color: #94a3b8; font-size: 13px; }

.controls-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin: 16px 0 22px;
  flex-wrap: wrap;
  font-size: 13px;
  color: #cbd5e1;
}

.controls-bar select {
  background: #1e293b;
  color: #e2e8f0;
  border: 1px solid rgba(148, 163, 184, 0.3);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 13px;
}

.vs { color: #f472b6; font-weight: 700; }

.start-btn {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.start-btn:hover { opacity: 0.9; }

.laya-warning { color: #fbbf24; font-size: 12px; }

main { margin-bottom: 20px; }

.boards {
  display: flex;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
}

.board-col {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 12px;
  padding: 16px;
  /* Must fit canvas(280) + 2 mini-boxes(~82 each) + gaps, or the mini-boxes/canvas
     overflow this box and visually bleed into the other column (they used to,
     at the old 330px). */
  width: 512px;
  flex: 0 0 auto;
  overflow: hidden; /* safety net: never let contents bleed into the next column */
}

.board-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.side-name { font-weight: 700; color: #cbd5e1; }

.ctl-badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(99, 102, 241, 0.25);
  color: #a5b4fc;
}

.board-wrap {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  justify-content: center;
}

#board-left, #board-right {
  background: #0b1120;
  border: 2px solid rgba(148, 163, 184, 0.25);
  border-radius: 4px;
}

.mini-box {
  background: #0b1120;
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 6px;
  padding: 4px;
  text-align: center;
}

.mini-label { font-size: 10px; color: #64748b; margin-bottom: 2px; }

.stats {
  display: flex;
  justify-content: space-around;
  font-size: 12px;
  color: #94a3b8;
  margin-top: 10px;
}
.stats b { color: #e2e8f0; }

.garbage-bar {
  height: 6px;
  border-radius: 3px;
  background: rgba(248, 113, 113, 0.15);
  margin-top: 8px;
  overflow: hidden;
}
.garbage-bar > .fill {
  height: 100%;
  background: linear-gradient(90deg, #f87171, #fbbf24);
  transition: width 0.2s;
}

.ai-panel {
  margin-top: 10px;
  border-top: 1px solid rgba(148, 163, 184, 0.15);
  padding-top: 8px;
  font-size: 12px;
  color: #94a3b8;
  min-height: 40px;
}

.ai-thinking {
  color: #fbbf24;
  font-size: 12px;
}

.ai-decision {
  margin-top: 4px;
  line-height: 1.5;
}
.ai-decision .lbl { color: #7dd3fc; }
.ai-decision .purpose { color: #86efac; }
.ai-decision .metric { color: #cbd5e1; }

.winner-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}
.winner-card {
  background: #1e293b;
  border: 1px solid rgba(99, 102, 241, 0.4);
  border-radius: 12px;
  padding: 28px 40px;
  text-align: center;
}
#winner-text { font-size: 22px; margin-bottom: 16px; color: #facc15; font-weight: 700; }

footer { text-align: center; }
.help { color: #64748b; font-size: 12px; }