:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #14141f;
  --bg-tertiary: #1e1e2e;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;
  --accent: #00d4ff;
  --accent-secondary: #00ff88;
  --danger: #ff4466;
  --focus-ring: #00d4ff;
  --focus-glow: rgba(0, 212, 255, 0.4);
  --radius-md: 12px;
  --radius-lg: 16px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  width: 600px;
  height: 600px;
  overflow: hidden;
  background: #000;
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  -webkit-font-smoothing: antialiased;
}

#app { width: 100%; height: 100%; position: relative; }

.screen {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0; left: 0;
  display: flex;
  flex-direction: column;
  padding: 28px 32px;
}

.screen.hidden { display: none; }

.hidden { display: none !important; }

.focusable {
  transition: all 0.15s ease;
  border: 2px solid transparent;
  cursor: pointer;
  outline: none;
  font-family: inherit;
  color: inherit;
}

.focusable:focus {
  border-color: var(--focus-ring);
  box-shadow: 0 0 20px var(--focus-glow);
}

/* ===== HEADER ===== */
.hdr {
  text-align: center;
  margin-bottom: 28px;
}

.hdr h1 {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: 4px;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 6px;
}

.hdr .sub {
  font-size: 14px;
  color: var(--text-secondary);
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* ===== MENU ===== */
.menu {
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex: 1;
  justify-content: center;
}

.menu-btn {
  background: var(--bg-secondary);
  border: 2px solid #2a2a3a;
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  display: grid;
  grid-template-columns: 56px 1fr auto;
  align-items: center;
  gap: 18px;
  min-height: 88px;
  text-align: left;
}

.menu-btn .ico {
  font-size: 32px;
  text-align: center;
}

.menu-btn .lbl {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 2px;
}

.menu-btn .hint {
  font-size: 13px;
  color: var(--text-secondary);
  letter-spacing: 1px;
}

.menu-btn.ghost {
  background: var(--bg-primary);
  grid-template-columns: 1fr;
  min-height: 64px;
  justify-items: center;
}

.menu-btn.ghost .lbl {
  font-size: 18px;
}

.menu-btn:focus {
  background: var(--bg-tertiary);
  transform: translateX(4px);
}

.ftr {
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 1px;
  padding-top: 12px;
}

/* ===== GAME SCREEN ===== */
#game { padding: 20px 24px; }

.game-hdr {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.player-tag {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  border: 2px solid transparent;
  transition: all 0.2s ease;
}

.player-tag.active-x {
  border-color: var(--accent);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.3);
}

.player-tag.active-o {
  border-color: var(--accent-secondary);
  box-shadow: 0 0 16px rgba(0, 255, 136, 0.3);
}

.player-tag .mark {
  font-size: 22px;
  font-weight: 800;
  width: 28px;
  text-align: center;
}

#player-x .mark { color: var(--accent); }
#player-o .mark { color: var(--accent-secondary); }

.player-tag .name {
  font-size: 12px;
  color: var(--text-secondary);
  flex: 1;
  letter-spacing: 1px;
}

.player-tag .score {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  min-width: 24px;
  text-align: right;
}

.turn-badge {
  background: var(--bg-tertiary);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--text-primary);
  white-space: nowrap;
}

/* ===== BOARD ===== */
.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 8px;
  width: 100%;
  aspect-ratio: 1;
  max-height: 400px;
  margin: 0 auto;
}

.cell {
  background: var(--bg-secondary);
  border: 2px solid #2a2a3a;
  border-radius: var(--radius-md);
  font-size: 72px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  font-family: inherit;
}

.cell:focus {
  background: var(--bg-tertiary);
  border-color: var(--focus-ring);
  box-shadow: 0 0 20px var(--focus-glow);
}

.cell.x { color: var(--accent); }
.cell.o { color: var(--accent-secondary); }

.cell.win {
  background: rgba(0, 212, 255, 0.18);
  border-color: var(--accent);
  animation: pulse 0.9s ease-in-out infinite alternate;
}

.cell.win.o {
  background: rgba(0, 255, 136, 0.18);
  border-color: var(--accent-secondary);
}

@keyframes pulse {
  from { box-shadow: 0 0 16px rgba(0, 212, 255, 0.4); }
  to { box-shadow: 0 0 28px rgba(0, 212, 255, 0.7); }
}

.cell.taken { cursor: default; }

/* ===== GAME CONTROLS ===== */
.game-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 16px;
}

.ctrl-btn {
  background: var(--bg-secondary);
  border: 2px solid #2a2a3a;
  border-radius: var(--radius-md);
  padding: 14px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
  min-height: 48px;
}

.ctrl-btn:focus {
  background: var(--bg-tertiary);
}

/* ===== OVERLAY ===== */
.overlay {
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 15, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  padding: 32px;
}

.overlay-card {
  background: var(--bg-secondary);
  border: 2px solid var(--accent);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  text-align: center;
  width: 100%;
  box-shadow: 0 0 40px rgba(0, 212, 255, 0.3);
}

.result-mark {
  font-size: 84px;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 12px;
}

.result-mark.x { color: var(--accent); }
.result-mark.o { color: var(--accent-secondary); }
.result-mark.draw { color: var(--text-secondary); }

.result-text {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 3px;
  margin-bottom: 28px;
  color: var(--text-primary);
}

.overlay-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.ov-btn {
  background: var(--accent);
  color: var(--bg-primary);
  border: 2px solid var(--accent);
  border-radius: var(--radius-md);
  padding: 16px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 2px;
  min-height: 56px;
}

.ov-btn.ghost {
  background: transparent;
  color: var(--text-primary);
  border-color: #2a2a3a;
}

.ov-btn:focus {
  transform: scale(1.02);
}

/* ===== STATS ===== */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-secondary);
  border: 2px solid #2a2a3a;
  border-radius: var(--radius-lg);
  padding: 22px;
  text-align: center;
}

.stat-num {
  font-size: 42px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 4px;
}

.stat-lbl {
  font-size: 12px;
  color: var(--text-secondary);
  letter-spacing: 2px;
}