/* ==========================================================================
   CYBER REVERSI - DESIGN SYSTEM
   ========================================================================== */

/* 変数定義 */
:root {
  --bg-dark: #05060b;
  --bg-grid: #0a0c16;
  --panel-bg: rgba(10, 12, 22, 0.55);
  --panel-border: rgba(0, 242, 254, 0.15);
  --panel-border-glow: rgba(0, 242, 254, 0.3);
  
  /* プレイヤー1 (ネオンブルー) */
  --p1-color: #00f2fe;
  --p1-glow: 0 0 15px rgba(0, 242, 254, 0.8), 0 0 30px rgba(0, 242, 254, 0.4);
  --p1-bg: linear-gradient(135deg, #00c6ff, #00f2fe);
  
  /* プレイヤー2 / CPU (ネオンピンク) */
  --p2-color: #ff007f;
  --p2-glow: 0 0 15px rgba(255, 0, 127, 0.8), 0 0 30px rgba(255, 0, 127, 0.4);
  --p2-bg: linear-gradient(135deg, #ff007f, #ff60b5);
  
  /* システムカラー */
  --accent-color: #aeff00;
  --accent-glow: 0 0 12px rgba(174, 255, 0, 0.8);
  --text-primary: #e2e8f0;
  --text-muted: #64748b;
  --text-dark: #0f172a;
  
  /* 盤面 */
  --board-bg: #090b11;
  --board-border: #1e293b;
  --square-border: rgba(30, 41, 59, 0.6);
  --highlight-bg: rgba(0, 242, 254, 0.12);
  --highlight-glow: 0 0 8px rgba(0, 242, 254, 0.5);
}

/* 全体リセットと基本設定 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent; /* モバイルのタップハイライト削除 */
}

body {
  font-family: 'Rajdhani', 'Inter', -apple-system, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* ==========================================================================
   背景エフェクト
   ========================================================================== */
.cyber-bg-effects {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
}

/* グリッドパターン */
.grid-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(18, 24, 45, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18, 24, 45, 0.3) 1px, transparent 1px);
  background-size: 30px 30px;
  background-position: center center;
}

.grid-overlay::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at center, transparent 20%, var(--bg-dark) 85%);
}

/* 発光するオーブ */
.glow-orb {
  position: absolute;
  width: 45vw;
  height: 45vw;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.15;
  pointer-events: none;
}

.p1-orb {
  top: -10%;
  left: -10%;
  background: var(--p1-color);
  animation: floatOrb 20s infinite alternate ease-in-out;
}

.p2-orb {
  bottom: -10%;
  right: -10%;
  background: var(--p2-color);
  animation: floatOrb 25s infinite alternate-reverse ease-in-out;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(8%, 10%) scale(1.15); }
}

/* ==========================================================================
   レイアウト
   ========================================================================== */
.app-container {
  width: 100%;
  max-width: 1200px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.5rem;
}

.app-header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.glitch-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 2.8rem;
  font-weight: 900;
  letter-spacing: 4px;
  color: #fff;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.3), var(--p1-glow);
  position: relative;
}

.subtitle {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.85rem;
  letter-spacing: 6px;
  color: var(--p2-color);
  margin-top: 0.25rem;
  text-shadow: 0 0 5px rgba(255, 0, 127, 0.4);
}

.game-layout {
  display: grid;
  grid-template-columns: 280px 1fr 280px;
  gap: 1.5rem;
  align-items: start;
  flex-grow: 1;
}

/* グラスモーフィズムパネル共通 */
.glass-panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 1.5rem;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.glass-panel:hover {
  border-color: var(--panel-border-glow);
}

.panel-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.1rem;
  letter-spacing: 2px;
  border-bottom: 2px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 0.75rem;
  margin-bottom: 1.25rem;
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.panel-title::after {
  content: "■";
  color: var(--p1-color);
  font-size: 0.7rem;
  text-shadow: var(--p1-glow);
}

/* ==========================================================================
   ステータスパネル (左側)
   ========================================================================== */
.status-panel {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.turn-indicator {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.label {
  font-size: 0.75rem;
  letter-spacing: 1px;
  color: var(--text-muted);
}

.turn-display {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 6px;
  position: relative;
  overflow: hidden;
}

.turn-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  position: relative;
}

.p1-turn .turn-dot {
  background-color: var(--p1-color);
  box-shadow: var(--p1-glow);
}

.p2-turn .turn-dot {
  background-color: var(--p2-color);
  box-shadow: var(--p2-glow);
}

.value {
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 1px;
}

.p1-turn .value {
  color: var(--p1-color);
  text-shadow: var(--p1-glow);
}

.p2-turn .value {
  color: var(--p2-color);
  text-shadow: var(--p2-glow);
}

.score-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.score-card {
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 6px;
  border-left: 4px solid transparent;
}

.score-card .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 0.75rem;
}

.p1-score-card {
  border-left-color: var(--p1-color);
}
.p1-dot {
  background-color: var(--p1-color);
  box-shadow: var(--p1-glow);
}

.p2-score-card {
  border-left-color: var(--p2-color);
}
.p2-dot {
  background-color: var(--p2-color);
  box-shadow: var(--p2-glow);
}

.score-card .label {
  flex-grow: 1;
  color: var(--text-primary);
  font-weight: 600;
}

.score-val {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
}

.p1-score-card .score-val {
  text-shadow: var(--p1-glow);
}
.p2-score-card .score-val {
  text-shadow: var(--p2-glow);
}

/* リアルタイム比率バー */
.ratio-bar-container {
  margin-top: 0.5rem;
}

.ratio-labels {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: 'Orbitron', sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

#ratio-p1-text {
  color: var(--p1-color);
  text-shadow: var(--p1-glow);
}

#ratio-p2-text {
  color: var(--p2-color);
  text-shadow: var(--p2-glow);
}

.ratio-title {
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.ratio-bar {
  height: 6px;
  background: #111322;
  border-radius: 3px;
  overflow: hidden;
  display: flex;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.ratio-fill {
  height: 100%;
  transition: width 0.6s cubic-bezier(0.19, 1, 0.22, 1);
}

.p1-fill {
  background: var(--p1-color);
  box-shadow: var(--p1-glow);
}

.p2-fill {
  background: var(--p2-color);
  box-shadow: var(--p2-glow);
}

/* ==========================================================================
   ボードエリア (中央)
   ========================================================================== */
.board-area {
  display: flex;
  justify-content: center;
  align-items: center;
}

.board-wrapper {
  position: relative;
  width: 100%;
  max-width: 480px;
  aspect-ratio: 1/1;
  background: linear-gradient(135deg, rgba(16, 20, 38, 0.6) 0%, rgba(8, 10, 19, 0.9) 100%);
  border: 2px solid rgba(0, 242, 254, 0.2);
  border-radius: 16px;
  padding: 12px;
  box-shadow: 
    0 20px 50px rgba(0, 0, 0, 0.6),
    inset 0 0 20px rgba(0, 242, 254, 0.05);
}

.othello-board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  width: 100%;
  height: 100%;
  background-color: var(--board-bg);
  border: 1px solid var(--board-border);
  border-radius: 8px;
  overflow: hidden;
}

.board-square {
  position: relative;
  background-color: var(--board-bg);
  border: 1px solid var(--square-border);
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

/* 角のマスにサイバーパンクな装飾ドット */
.board-square.corner-mark::after {
  content: "";
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--text-muted);
  border-radius: 50%;
  opacity: 0.4;
}

/* オセロ本来のドット（星）の位置 (2,2), (2,6), (6,2), (6,6) ※0始まりで3,3等 */
.board-square.star-point::after {
  content: "";
  position: absolute;
  width: 6px;
  height: 6px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  box-shadow: 0 0 5px rgba(255, 255, 255, 0.3);
}

/* 着手可能場所のハイライト */
.board-square.playable {
  background-color: var(--highlight-bg);
}

.board-square.playable::before {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--p1-color);
  opacity: 0.5;
  box-shadow: var(--highlight-glow);
  animation: pulseHighlight 1.5s infinite alternate ease-in-out;
}

/* 相手（ピンク）のターンの時のハイライト */
.board-square.playable.p2-playable::before {
  border-color: var(--p2-color);
  box-shadow: 0 0 8px rgba(255, 0, 127, 0.5);
}

@keyframes pulseHighlight {
  0% { transform: scale(0.85); opacity: 0.3; }
  100% { transform: scale(1.15); opacity: 0.7; }
}

.board-square:hover {
  background-color: rgba(255, 255, 255, 0.02);
}

.board-square.playable:hover {
  background-color: rgba(0, 242, 254, 0.2);
}

.board-square.playable.p2-playable:hover {
  background-color: rgba(255, 0, 127, 0.15);
}

/* ==========================================================================
   石 (Disc) & 3D回転アニメーション
   ========================================================================== */
.disc {
  width: 78%;
  height: 78%;
  border-radius: 50%;
  position: relative;
  perspective: 600px; /* 3D効果 */
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.disc-inner {
  position: absolute;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.2);
}

/* 表裏の共通スタイル */
.disc-face {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  backface-visibility: hidden; /* 裏返し時は非表示 */
  box-shadow: inset 0 2px 5px rgba(255, 255, 255, 0.2), 0 4px 10px rgba(0, 0, 0, 0.5);
}

/* 青面 (Player 1) */
.disc-face.p1-face {
  background: var(--p1-bg);
  box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.4), var(--p1-glow);
}

/* ピンク面 (Player 2) */
.disc-face.p2-face {
  background: var(--p2-bg);
  transform: rotateY(180deg); /* 反対側に向ける */
  box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.4), var(--p2-glow);
}

/* 石の現在のプレイヤー状態に基づくクラス */
.disc.p1 .disc-inner {
  transform: rotateY(0deg);
}

.disc.p2 .disc-inner {
  transform: rotateY(180deg);
}

/* 新規配置時の波紋エフェクトアニメーション */
.disc.placed-effect {
  animation: placeZoom 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes placeZoom {
  0% { transform: scale(0); }
  70% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

/* ==========================================================================
   AI思考中オーバーレイ
   ========================================================================== */
.ai-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(5, 6, 11, 0.75);
  backdrop-filter: blur(4px);
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 10;
  opacity: 1;
  transition: opacity 0.3s ease;
}

.ai-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.ai-spinner {
  width: 50px;
  height: 50px;
  border: 3px solid rgba(255, 0, 127, 0.1);
  border-top-color: var(--p2-color);
  border-bottom-color: var(--p2-color);
  border-radius: 50%;
  box-shadow: var(--p2-glow);
  animation: spin 1.2s cubic-bezier(0.5, 0, 0.5, 1) infinite;
  margin-bottom: 1.25rem;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.ai-text {
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 3px;
  color: var(--p2-color);
  text-shadow: var(--p2-glow);
  margin-bottom: 0.25rem;
}

.ai-subtext {
  font-size: 0.7rem;
  letter-spacing: 1px;
  color: var(--text-muted);
}

.dots {
  display: inline-block;
  width: 15px;
  text-align: left;
  animation: dotBlink 1.5s infinite steps(4);
}

@keyframes dotBlink {
  0% { content: ""; }
  25% { content: "."; }
  50% { content: ".."; }
  75% { content: "..."; }
}

/* ==========================================================================
   コントロールパネル (右側)
   ========================================================================== */
.control-panel {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-label {
  font-size: 0.75rem;
  letter-spacing: 1px;
  color: var(--text-muted);
}

/* ボタン式の切り替えトグル */
.button-toggle {
  display: flex;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 6px;
  padding: 2px;
  width: 100%;
}

.toggle-btn {
  flex-grow: 1;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: 'Orbitron', sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.6rem 0.5rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.toggle-btn.active {
  background: rgba(0, 242, 254, 0.15);
  color: var(--p1-color);
  border: 1px solid rgba(0, 242, 254, 0.3);
  text-shadow: var(--p1-glow);
}

/* CPUレベル用の特殊アクティブ色 (ピンク) */
.level-toggle .toggle-btn.active {
  background: rgba(255, 0, 127, 0.15);
  color: var(--p2-color);
  border-color: rgba(255, 0, 127, 0.3);
  text-shadow: var(--p2-glow);
}

.toggles-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

/* スイッチコンテナ */
.toggle-switch-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.02);
  border-radius: 8px;
  padding: 0.75rem;
  gap: 0.5rem;
}

.switch-label {
  font-size: 0.7rem;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  font-weight: 600;
}

/* トグルスイッチデザイン */
.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 22px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #1e293b;
  transition: .3s;
  border-radius: 11px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.slider:before {
  position: absolute;
  content: "";
  height: 14px;
  width: 14px;
  left: 3px;
  bottom: 3px;
  background-color: var(--text-muted);
  transition: .3s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: rgba(0, 242, 254, 0.15);
  border-color: var(--p1-color);
}

input:checked + .slider:before {
  transform: translateX(22px);
  background-color: var(--p1-color);
  box-shadow: var(--p1-glow);
}

/* アクションボタン */
.action-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.action-btn {
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 1.5px;
  padding: 0.8rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.3s cubic-bezier(0.19, 1, 0.22, 1);
}

.btn-prim {
  background: var(--p1-bg);
  border: none;
  color: var(--text-dark);
  box-shadow: 0 4px 15px rgba(0, 242, 254, 0.2);
}

.btn-prim:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 242, 254, 0.4), var(--p1-glow);
}

.btn-prim:active:not(:disabled) {
  transform: translateY(0);
}

.btn-sec {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}

.btn-sec:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--text-primary);
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
}

.btn-sec:disabled, .btn-prim:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* ==========================================================================
   結果モーダル (Modal)
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(5, 6, 11, 0.85);
  backdrop-filter: blur(12px);
  z-index: 100;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 1;
  transition: opacity 0.4s ease;
}

.modal-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.modal-content {
  width: 90%;
  max-width: 450px;
  position: relative;
  overflow: hidden;
  text-align: center;
  border-color: var(--p1-color);
  box-shadow: 0 20px 60px rgba(0, 242, 254, 0.1), 0 0 30px rgba(0, 242, 254, 0.05);
  animation: modalSlideUp 0.5s cubic-bezier(0.19, 1, 0.22, 1);
}

@keyframes modalSlideUp {
  0% { transform: translateY(30px); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}

.modal-glow {
  position: absolute;
  top: -50px;
  left: 50%;
  transform: translateX(-50%);
  width: 150px;
  height: 100px;
  background: var(--p1-color);
  filter: blur(40px);
  opacity: 0.3;
  pointer-events: none;
}

.modal-headline {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.8rem;
  font-weight: 900;
  letter-spacing: 2px;
  color: #fff;
  margin-bottom: 1.5rem;
  text-shadow: var(--p1-glow);
}

.modal-body {
  margin-bottom: 2rem;
}

.final-score {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  background: rgba(0, 0, 0, 0.3);
  padding: 1.25rem;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  margin-bottom: 1rem;
}

.modal-score-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.modal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.modal-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 600;
}

.modal-val {
  font-family: 'Orbitron', sans-serif;
  font-size: 2.2rem;
  font-weight: 700;
  color: #fff;
}

.p1-card .modal-val { text-shadow: var(--p1-glow); }
.p2-card .modal-val { text-shadow: var(--p2-glow); }

.modal-divider {
  font-family: 'Orbitron', sans-serif;
  font-weight: 900;
  color: var(--text-muted);
  font-size: 1.1rem;
}

.modal-msg {
  font-size: 0.9rem;
  color: var(--text-primary);
  font-weight: 500;
  letter-spacing: 1px;
}

.modal-actions {
  display: flex;
  justify-content: center;
}

.modal-actions button {
  width: 100%;
}

/* ==========================================================================
   フッター (Footer)
   ========================================================================== */
.app-footer {
  text-align: center;
  padding: 1.5rem 0;
  font-size: 0.65rem;
  letter-spacing: 2px;
  color: var(--text-muted);
}

/* ==========================================================================
   レスポンシブメディアクエリ
   ========================================================================== */

/* タブレット / 中画面以下 */
@media (max-width: 1024px) {
  .app-container {
    padding: 1rem;
  }
  
  .glitch-title {
    font-size: 2.2rem;
  }
  
  .game-layout {
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
  }
  
  .board-area {
    grid-column: 1 / -1; /* 盤面を一番上に配置する、あるいは中央 */
    grid-row: 1;
    margin-bottom: 0.5rem;
  }
  
  .status-panel {
    grid-column: 1;
    grid-row: 2;
  }
  
  .control-panel {
    grid-column: 2;
    grid-row: 2;
  }
}

/* スマートフォン / 小画面 */
@media (max-width: 600px) {
  .app-container {
    padding: 0.75rem;
  }

  .glitch-title {
    font-size: 1.8rem;
    letter-spacing: 2px;
  }
  
  .subtitle {
    font-size: 0.75rem;
    letter-spacing: 3px;
  }

  .game-layout {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .board-area {
    grid-column: 1;
    grid-row: 1;
  }
  
  .status-panel {
    grid-column: 1;
    grid-row: 2;
  }
  
  .control-panel {
    grid-column: 1;
    grid-row: 3;
  }
  
  .board-wrapper {
    max-width: 92vw;
  }
  
  .toggles-grid {
    grid-template-columns: 1fr;
  }
  
  .score-container {
    flex-direction: row;
  }
  
  .score-card {
    flex: 1;
    justify-content: center;
    padding: 0.5rem;
  }
  
  .score-val {
    font-size: 1.2rem;
  }
}

/* ==========================================================================
   CLASSIC OTHELLO THEME (クラシックテーマ)
   ========================================================================== */

/* クラシック用の変数定義 */
body[data-theme="classic"] {
  --bg-dark: #0d0f12; /* 深みのあるダークチャコール */
  --panel-bg: rgba(20, 24, 33, 0.65); /* 落ち着いたダークグレー */
  --panel-border: rgba(255, 255, 255, 0.05);
  --panel-border-glow: rgba(212, 175, 55, 0.25); /* 上品なゴールドの輝き */

  /* 白黒オセロ石 */
  --p1-color: #111111; /* 黒石 */
  --p1-glow: 0 4px 10px rgba(0, 0, 0, 0.6), inset 0 2px 3px rgba(255, 255, 255, 0.15);
  --p1-bg: radial-gradient(circle at 35% 35%, #4a4a4a 0%, #151515 45%, #050505 85%);

  --p2-color: #f0f0f0; /* 白石 */
  --p2-glow: 0 4px 10px rgba(0, 0, 0, 0.4), inset 0 2px 3px rgba(255, 255, 255, 0.85);
  --p2-bg: radial-gradient(circle at 35% 35%, #ffffff 0%, #ececec 50%, #c5c5c5 90%);

  /* システムカラー */
  --accent-color: #d4af37; /* ゴールド */
  --accent-glow: 0 0 10px rgba(212, 175, 55, 0.4);
  --text-primary: #e2e8f0;
  --text-muted: #64748b;
  --text-dark: #1e1b18;

  /* 盤面 */
  --board-bg: #0d5f30; /* 深緑フェルト調 */
  --board-border: #142a1b;
  --square-border: rgba(0, 0, 0, 0.25);
  --highlight-bg: rgba(255, 255, 255, 0.04);
  --highlight-glow: 0 0 6px rgba(255, 255, 255, 0.3);
}

/* 1. 背景の切り替え（高級ダークウッド調） */
body[data-theme="classic"] .cyber-bg-effects {
  background: 
    radial-gradient(circle at center, transparent 20%, rgba(5,5,5,0.9) 95%),
    linear-gradient(135deg, #1b130e 0%, #080605 100%);
}

body[data-theme="classic"] .grid-overlay,
body[data-theme="classic"] .glow-orb {
  display: none !important;
}

/* 2. タイトルのトラディショナル化 */
body[data-theme="classic"] .glitch-title {
  font-family: 'Times New Roman', 'Georgia', serif;
  font-size: 3.2rem;
  font-weight: 700;
  letter-spacing: 6px;
  background: linear-gradient(to bottom, #f9f5e8 0%, #d4af37 50%, #99781b 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 3px 5px rgba(0, 0, 0, 0.6);
  animation: none;
}

body[data-theme="classic"] .glitch-title::before,
body[data-theme="classic"] .glitch-title::after {
  display: none !important;
}

body[data-theme="classic"] .glitch-title::after {
  content: "";
}

/* タイトル文言切り替えをCSSで行う (元のCYBER REVERSIからREVERSIへ) */
body[data-theme="classic"] .glitch-title {
  color: #d4af37;
}

body[data-theme="classic"] .subtitle {
  font-family: 'Georgia', serif;
  color: #a4821a;
  letter-spacing: 5px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

/* 3. プレイヤーインジケーター */
body[data-theme="classic"] .p1-turn .turn-dot {
  background: #151515;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

body[data-theme="classic"] .p2-turn .turn-dot {
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.2);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

body[data-theme="classic"] .p1-turn .value {
  color: #ffffff;
  text-shadow: none;
}

body[data-theme="classic"] .p2-turn .value {
  color: #ffffff;
  text-shadow: none;
}

/* 4. スコアカード */
body[data-theme="classic"] .p1-score-card {
  border-left-color: #1a1a1a;
}
body[data-theme="classic"] .p1-dot {
  background: #111111;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: none;
}

body[data-theme="classic"] .p2-score-card {
  border-left-color: #e5e5e5;
}
body[data-theme="classic"] .p2-dot {
  background: #f0f0f0;
  border: 1px solid rgba(0, 0, 0, 0.15);
  box-shadow: none;
}

body[data-theme="classic"] .score-card .label {
  color: var(--text-primary);
}

body[data-theme="classic"] .p1-score-card .score-val {
  color: #ffffff;
  text-shadow: none;
}
body[data-theme="classic"] .p2-score-card .score-val {
  color: #ffffff;
  text-shadow: none;
}

/* 5. リアルタイム割合分析バー */
body[data-theme="classic"] #ratio-p1-text {
  color: #94a3b8;
  text-shadow: none;
}

body[data-theme="classic"] #ratio-p2-text {
  color: #f1f5f9;
  text-shadow: none;
}

body[data-theme="classic"] .p1-fill {
  background: #111111;
  box-shadow: none;
  border-right: 1px solid rgba(255, 255, 255, 0.05);
}

body[data-theme="classic"] .p2-fill {
  background: #f0f0f0;
  box-shadow: none;
  border-left: 1px solid rgba(0, 0, 0, 0.05);
}

/* 6. 木製額縁フレームオセロ盤面 (.board-wrapper) */
body[data-theme="classic"] .board-wrapper {
  background: linear-gradient(135deg, #422513 0%, #221209 100%);
  border: 6px solid #1a0d06;
  box-shadow: 
    0 15px 40px rgba(0, 0, 0, 0.8),
    inset 0 4px 10px rgba(255, 255, 255, 0.12),
    inset 0 -4px 10px rgba(0, 0, 0, 0.6);
  border-radius: 14px;
  padding: 14px;
}

body[data-theme="classic"] .othello-board {
  background-color: var(--board-bg);
  border: 2px solid #07381c;
  box-shadow: inset 0 3px 8px rgba(0, 0, 0, 0.5);
  border-radius: 4px;
}

/* マスのフェルト質感 */
body[data-theme="classic"] .board-square {
  background: radial-gradient(circle, #0e6c37 0%, #0a4f28 100%);
  border: 1px solid rgba(0, 0, 0, 0.3);
  transition: background-color 0.15s ease;
}

body[data-theme="classic"] .board-square:hover {
  background: radial-gradient(circle, #128243 0%, #0c5b2f 100%);
}

/* 星マーク (黒ドット) */
body[data-theme="classic"] .board-square.star-point::after {
  background: #000000;
  width: 7px;
  height: 7px;
  box-shadow: 0 1px 1px rgba(255, 255, 255, 0.15);
  opacity: 0.9;
}

/* 角のサイバー装飾は非表示 */
body[data-theme="classic"] .board-square.corner-mark::after {
  display: none !important;
}

/* 7. 上品な着手ガイド */
body[data-theme="classic"] .board-square.playable {
  background: radial-gradient(circle, #107c3f 0%, #0a542a 100%);
}

body[data-theme="classic"] .board-square.playable::before {
  border-color: rgba(255, 255, 255, 0.45);
  width: 14px;
  height: 14px;
  box-shadow: 0 0 5px rgba(255, 255, 255, 0.25);
  animation: pulseClassic 1.8s infinite alternate ease-in-out;
}

body[data-theme="classic"] .board-square.playable.p2-playable::before {
  border-color: rgba(255, 255, 255, 0.45);
  box-shadow: 0 0 5px rgba(255, 255, 255, 0.25);
}

@keyframes pulseClassic {
  0% { transform: scale(0.9); opacity: 0.35; }
  100% { transform: scale(1.1); opacity: 0.75; }
}

body[data-theme="classic"] .board-square.playable:hover {
  background: radial-gradient(circle, #16934c 0%, #0d6332 100%);
}

/* 8. 立体的な白黒の石 (Disc) */
body[data-theme="classic"] .disc-face {
  box-shadow: 
    inset 0 3px 6px rgba(255, 255, 255, 0.15), 
    inset 0 -3px 6px rgba(0, 0, 0, 0.2),
    0 4px 8px rgba(0, 0, 0, 0.4);
}

body[data-theme="classic"] .disc-face.p1-face {
  background: var(--p1-bg);
  box-shadow: var(--p1-glow);
  border: 1px solid #000000;
}

body[data-theme="classic"] .disc-face.p2-face {
  background: var(--p2-bg);
  box-shadow: var(--p2-glow);
  border: 1px solid #cccccc;
}

/* AI思考中オーバーレイ */
body[data-theme="classic"] .ai-overlay {
  background: rgba(10, 12, 16, 0.75);
}

body[data-theme="classic"] .ai-spinner {
  border-color: rgba(212, 175, 55, 0.1);
  border-top-color: #d4af37;
  border-bottom-color: #d4af37;
  box-shadow: 0 0 15px rgba(212, 175, 55, 0.3);
}

body[data-theme="classic"] .ai-text {
  color: #d4af37;
  text-shadow: 0 1px 3px rgba(0,0,0,0.5);
  font-family: 'Georgia', serif;
}

/* トグルボタンアクティブ色 (アンバー/ゴールド系) */
body[data-theme="classic"] .theme-toggle .toggle-btn.active {
  background: rgba(212, 175, 55, 0.15);
  color: #d4af37;
  border-color: rgba(212, 175, 55, 0.35);
  text-shadow: 0 0 5px rgba(212, 175, 55, 0.4);
}

body[data-theme="classic"] .level-toggle .toggle-btn.active {
  background: rgba(212, 175, 55, 0.15);
  color: #d4af37;
  border-color: rgba(212, 175, 55, 0.35);
  text-shadow: 0 0 5px rgba(212, 175, 55, 0.4);
}

body[data-theme="classic"] input:checked + .slider {
  background-color: rgba(212, 175, 55, 0.15);
  border-color: #d4af37;
}

body[data-theme="classic"] input:checked + .slider:before {
  background-color: #d4af37;
  box-shadow: 0 0 8px rgba(212, 175, 55, 0.5);
}

body[data-theme="classic"] .btn-prim {
  background: linear-gradient(to bottom, #fbf7eb 0%, #d4af37 100%);
  color: #1e0f06;
  font-family: 'Georgia', serif;
  font-weight: 700;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
  border: 1px solid #aa7c11;
}

body[data-theme="classic"] .btn-prim:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(212, 175, 55, 0.4), 0 0 10px rgba(212, 175, 55, 0.2);
}

body[data-theme="classic"] .btn-sec {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-family: 'Georgia', serif;
}

body[data-theme="classic"] .panel-title::after {
  color: #d4af37;
  text-shadow: 0 0 5px rgba(212, 175, 55, 0.4);
}

/* 結果モーダル */
body[data-theme="classic"] .modal-content {
  border-color: #d4af37;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.85);
}

body[data-theme="classic"] .modal-glow {
  background: #d4af37;
  opacity: 0.15;
}

body[data-theme="classic"] .modal-headline {
  font-family: 'Georgia', serif;
  color: #d4af37;
  text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

body[data-theme="classic"] .final-score {
  background: rgba(0,0,0,0.4);
  border: 1px solid rgba(255,255,255,0.03);
}

body[data-theme="classic"] .p1-card .modal-val {
  text-shadow: none;
  color: #ffffff;
}
body[data-theme="classic"] .p2-card .modal-val {
  text-shadow: none;
  color: #ffffff;
}

body[data-theme="classic"] .modal-divider {
  font-family: 'Georgia', serif;
}