.Reversi {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
  background: #0a0a0a;
  color: #e0e0e0;
  font-family: "Courier New", monospace;
  user-select: none;
}
.Reversi-Header {
  margin-bottom: 24px;
  text-align: center;
  animation: reversiFadeIn 0.6s ease;
}
.Reversi-Title {
  margin: 0;
  color: #fff;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 12px;
  text-transform: uppercase;
}
.Reversi-Subtitle {
  margin-top: 4px;
  color: #555;
  font-size: 11px;
  letter-spacing: 6px;
}
.Reversi-Score {
  display: flex;
  align-items: center;
  gap: 40px;
  margin-bottom: 16px;
}
.Reversi-ScoreCard {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  transition: all 0.3s;
}
.Reversi-ScoreCard[data-active] {
  border-color: rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
}
.Reversi-ScoreStone {
  width: 22px;
  height: 22px;
  border-radius: 50%;
}
.Reversi-ScoreStone[data-stone=black] {
  background: radial-gradient(circle at 35% 35%, #555, #111);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
}
.Reversi-ScoreStone[data-stone=white] {
  background: radial-gradient(circle at 35% 35%, #fff, #bbb);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}
.Reversi-ScoreCount {
  min-width: 28px;
  color: #fff;
  font-size: 22px;
  font-weight: 700;
  text-align: center;
}
.Reversi-ScoreLabel {
  color: #666;
  font-size: 11px;
  letter-spacing: 2px;
}
.Reversi-ScoreVersus {
  color: #333;
  font-size: 14px;
}
.Reversi-Stats {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
  color: #666;
  font-size: 12px;
  letter-spacing: 1px;
}
.Reversi-Setting {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-bottom: 18px;
}
.Reversi-Setting[data-mode=two-player] [data-cpu-only] {
  display: none;
}
.Reversi-SettingGroup {
  display: flex;
  gap: 4px;
}
.Reversi-Option {
  padding: 5px 12px;
  border: 1px solid #333;
  border-radius: 6px;
  background: transparent;
  color: #888;
  font-family: "Courier New", monospace;
  font-size: 11px;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.2s;
}
.Reversi-Option:hover {
  border-color: #666;
  color: #ccc;
}
.Reversi-Option[data-active] {
  border-color: #777;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}
.Reversi-Pass {
  display: none;
  margin-bottom: 12px;
  padding: 6px 16px;
  border: 1px solid rgba(255, 180, 0, 0.3);
  border-radius: 6px;
  background: rgba(255, 180, 0, 0.1);
  color: #ffb400;
  font-size: 13px;
  animation: reversiFadeIn 0.4s ease;
}
.Reversi-Pass[data-visible] {
  display: block;
}
.Reversi-Canvas {
  display: block;
  cursor: pointer;
  touch-action: manipulation;
}
.Reversi-Status {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 20px;
  color: #777;
  font-size: 14px;
  letter-spacing: 3px;
  text-align: center;
}
.Reversi-Status[data-game-over] {
  color: #ffb400;
  animation: reversiSlideUp 0.5s ease;
}
.Reversi-Status[data-game-over] .Reversi-StatusLine {
  margin-bottom: 4px;
  color: #fff;
  font-size: 20px;
  font-weight: 700;
}
.Reversi-StatusScore {
  color: #555;
  font-size: 12px;
}
.Reversi-Controls {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}
.Reversi-Button {
  padding: 10px 28px;
  border: 1px solid #333;
  border-radius: 6px;
  background: transparent;
  color: #888;
  font-family: "Courier New", monospace;
  font-size: 12px;
  letter-spacing: 3px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.3s;
}
.Reversi-Button:hover {
  border-color: #666;
  color: #fff;
}
.Reversi-Button[data-disabled] {
  opacity: 0.35;
  cursor: default;
}
.Reversi-Button[data-disabled]:hover {
  border-color: #333;
  color: #888;
}

@keyframes reversiFadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes reversiSlideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}