:root {
  --bg-deep: #050a25;
  --bg-mid: #0c1440;
  --board-bg: rgba(10, 16, 49, 0.85);
  --cell-bg: rgba(15, 22, 60, 0.7);
  --cell-hover: rgba(37, 236, 255, 0.08);
  --player-color: #25ecff;
  --cpu-color: #ff4fc6;
  --text-primary: #d5d1ff;
  --text-muted: #b8c1ea;
  --line-color: rgba(132, 173, 255, 0.3);
}

* {
  box-sizing: border-box;
}

html, body, #app {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

body {
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: "Space Grotesk", system-ui, sans-serif;
  min-width: 320px;
}

.cf-app {
  width: 100vw;
  height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(37, 236, 255, 0.08), transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(255, 79, 198, 0.06), transparent 50%),
    linear-gradient(160deg, var(--bg-deep), var(--bg-mid));
}

.cf-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px 8px;
  gap: 12px;
  flex-wrap: wrap;
}

.cf-title-group h1 {
  margin: 0;
  font-family: "Orbitron", system-ui, sans-serif;
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 800;
  color: #d5d1ff;
  text-shadow: 0 0 20px rgba(37, 236, 255, 0.3);
}

.cf-score-bar {
  display: flex;
  gap: clamp(8px, 2vw, 20px);
  align-items: center;
}

.cf-score-item {
  display: flex;
  align-items: baseline;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 8px;
  background: rgba(18, 30, 77, 0.5);
  border: 1px solid rgba(132, 173, 255, 0.2);
}

.cf-score-item span {
  font-size: clamp(0.6rem, 1.4vw, 0.75rem);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.cf-score-item strong {
  font-family: "Orbitron", system-ui, sans-serif;
  font-size: clamp(0.9rem, 2vw, 1.2rem);
  font-weight: 700;
}

.cf-score-item--player strong { color: var(--player-color); }
.cf-score-item--draw strong { color: #ffe57d; }
.cf-score-item--cpu strong { color: var(--cpu-color); }

.cf-controls {
  display: flex;
  gap: 6px;
  align-items: center;
}

.cf-diff-btn {
  border: 1px solid rgba(132, 173, 255, 0.3);
  background: rgba(18, 30, 77, 0.4);
  color: var(--text-muted);
  border-radius: 6px;
  padding: 4px 12px;
  font-family: "Space Grotesk", system-ui, sans-serif;
  font-size: clamp(0.65rem, 1.3vw, 0.78rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 180ms ease;
}

.cf-diff-btn:hover {
  border-color: rgba(37, 236, 255, 0.5);
  color: #d8f8ff;
}

.cf-diff-btn--active {
  border-color: rgba(37, 236, 255, 0.7);
  background: rgba(37, 236, 255, 0.12);
  color: #d8f8ff;
}

.cf-restart-btn {
  border: 1px solid rgba(185, 108, 255, 0.5);
  background: rgba(185, 108, 255, 0.1);
  color: #d8f8ff;
  border-radius: 999px;
  padding: 6px 18px;
  font-family: "Orbitron", system-ui, sans-serif;
  font-size: clamp(0.65rem, 1.3vw, 0.78rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: all 180ms ease;
}

.cf-restart-btn:hover {
  border-color: rgba(185, 108, 255, 0.8);
  background: rgba(185, 108, 255, 0.2);
}

.cf-board-area {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  position: relative;
}

.cf-status-bar {
  text-align: center;
  padding: 8px 16px 14px;
}

.cf-status-text {
  font-family: "Orbitron", system-ui, sans-serif;
  font-size: clamp(0.85rem, 2vw, 1.1rem);
  font-weight: 700;
  color: var(--text-primary);
  text-shadow: 0 0 12px rgba(213, 209, 255, 0.3);
}

.cf-status-text--win {
  color: var(--player-color);
  text-shadow: 0 0 20px rgba(37, 236, 255, 0.6);
}

.cf-status-text--lose {
  color: var(--cpu-color);
  text-shadow: 0 0 20px rgba(255, 79, 198, 0.6);
}

.cf-status-text--draw {
  color: #ffe57d;
  text-shadow: 0 0 20px rgba(255, 229, 125, 0.6);
}

/* PixiJS canvas */
#pixi-canvas {
  border-radius: 12px;
  overflow: hidden;
}

@media (max-width: 720px) {
  .cf-header {
    padding: 8px 12px 4px;
  }
  .cf-score-item {
    padding: 3px 6px;
  }
}