/* --- 既存のスタイルを一部修正・追加 --- */
* { margin:0; padding:0; box-sizing:border-box; }
body {
  background: radial-gradient(ellipse at center, #1a0900 0%, #060200 100%);
  display: flex; 
  flex-direction: row; /* 横並びに変更 */
  align-items: center; 
  justify-content: center;
  min-height: 100vh; 
  user-select: none;
  font-family: 'Hiragino Mincho Pro', 'Yu Mincho', 'MS Mincho', serif;
  padding: 8px;
  gap: 12px;
}

/* 盤面中央エリア */
#game-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 0;
  width: 100%;
  max-width: 760px;
}

#info {
  color: #f0d090; font-size: 18px; margin: 6px 0;
  letter-spacing: 2px; height: 28px; text-shadow: 0 1px 6px #0008;
  font-weight: bold;
}

#canvas-wrap { width: 100%; }
canvas { display: block; cursor: pointer; border-radius: 4px; width: 100%; height: auto; }

#btnRow { margin-top: 12px; display: flex; gap: 6px; flex-wrap: wrap; justify-content: center; }
button {
  padding: 8px 12px; background: #3a1500; color: #f0d090;
  border: 1px solid #804010; font-size: 14px; cursor: pointer;
  border-radius: 4px; letter-spacing: 1px; font-family: inherit;
  transition: 0.2s;
}
button:hover { background: #5a2800; box-shadow: 0 0 10px rgba(128,64,16,0.5); }

/* --- ルール説明エリア（左側に配置） --- */
#rules {
  color: #d0b090; 
  font-size: 13px; 
  text-align: left;
  line-height: 1.8; 
  width: 260px; /* 固定幅 */
  background: rgba(40, 20, 0, 0.6);
  padding: 20px;
  border-left: 3px solid #804010;
  border-radius: 4px;
  box-shadow: inset 0 0 20px rgba(0,0,0,0.5);
}

#rules h3 {
  color: #ffaa44;
  font-size: 15px;
  margin-bottom: 10px;
  border-bottom: 1px solid #503010;
  padding-bottom: 5px;
  display: flex;
  align-items: center;
  gap: 5px;
}

#rules ul {
  margin-left: 18px;
  margin-bottom: 10px;
  color: #b09070;
}

.highlight { color: #ffcc66; font-weight: bold; }
.warning { color: #ff6655; font-size: 12px; margin-top: 15px; border-top: 1px solid #503010; padding-top: 10px; }

/* 棋譜パネル（game-container内、ボタン下） */
#kifu-panel {
  margin-top: 10px;
  width: 100%;
  background: rgba(40,20,0,0.5);
  border: 1px solid #804010;
  border-radius: 4px;
  padding: 8px 12px;
}
#kifu-header {
  color: #ffaa44;
  font-size: 13px;
  font-weight: bold;
  margin-bottom: 6px;
  padding-bottom: 4px;
  border-bottom: 1px solid #503010;
}
#kifu-list {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 8px;
  max-height: 120px;
  overflow-y: auto;
  font-family: 'Hiragino Mincho Pro','Yu Mincho',serif;
  font-size: 12px;
  line-height: 1.8;
}
#kifu-list div { white-space: nowrap; }
#kifu-list div.latest { font-weight: bold; background: rgba(255,200,50,0.15); border-radius: 2px; padding: 0 3px; }

/* スマホ等で縦に並べる対応 */
@media (max-width: 1100px) {
  body { flex-direction: column; }
  #rules { width: 100%; max-width: 760px; order: 2; box-sizing: border-box; }
}

/* 難易度UIバー */
#diffRow {
  margin-top: 8px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: rgba(20,8,0,0.55);
  border: 1px solid #503010;
  border-radius: 6px;
  padding: 10px 14px;
}
#diffRow button {
  padding: 8px 12px;
  font-size: 13px;
  min-height: 36px;
  background: #2a1200;
  color: #c0a060;
  border: 1px solid #804010;
  border-radius: 4px;
  cursor: pointer;
  transition: 0.15s;
  letter-spacing: 0.5px;
}
#diffRow button:hover { background: #4a2500; color: #ffe090; }

/* スマホ向け細かい調整 */
@media (max-width: 480px) {
  #info { font-size: 15px; letter-spacing: 1px; }
  #btnRow button { padding: 10px 10px; font-size: 13px; }
  #diffRow button { padding: 10px 10px; min-height: 40px; font-size: 13px; }
  #diffRow { padding: 10px; }
  #col-desc { font-size: 13px !important; }
}