:root {
  --board-color: #DDB87A;
  --board-line: #8B6914;
  --board-shadow: #B8962E;
  --bg-color: #1a1410;
  --bg-gradient-start: #2C1810;
  --bg-gradient-end: #1a1410;
  --piece-bg: #F5DEB3;
  --piece-text: #1a1a1a;
  --piece-promoted: #CC3333;
  --piece-border: #8B7355;
  --highlight-selected: rgba(76, 175, 80, 0.45);
  --highlight-move: rgba(66, 133, 244, 0.35);
  --highlight-last-move: rgba(255, 235, 59, 0.3);
  --hand-bg: rgba(221, 184, 122, 0.15);
  --hand-border: rgba(221, 184, 122, 0.3);
  --cell-size: min(10vw, 64px);
  --piece-font-size: calc(var(--cell-size) * 0.42);
  --dialog-bg: rgba(0, 0, 0, 0.7);
}

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

body {
  background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
  min-height: 100vh;
  font-family: "Hiragino Mincho ProN", "Yu Mincho", "MS Mincho", serif;
  color: #e0d5c5;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 10px;
}

#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
  max-width: 700px;
}

/* Header */
#header {
  text-align: center;
}

#header h1 {
  font-size: 1.8rem;
  letter-spacing: 0.5em;
  color: #e8d5b5;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
  margin-bottom: 4px;
}

#status {
  font-size: 1.1rem;
  padding: 6px 24px;
  background: rgba(221, 184, 122, 0.12);
  border: 1px solid rgba(221, 184, 122, 0.25);
  border-radius: 4px;
  min-width: 200px;
}

#status.check {
  color: #ff6b6b;
  border-color: rgba(255, 107, 107, 0.5);
  background: rgba(255, 107, 107, 0.1);
  animation: pulse-check 1s ease-in-out infinite;
}

@keyframes pulse-check {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* Game Area */
#game-area {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  justify-content: center;
  width: 100%;
}

/* Hand Areas */
.hand-area {
  background: var(--hand-bg);
  border: 1px solid var(--hand-border);
  border-radius: 6px;
  padding: 8px;
  min-width: 80px;
  min-height: 200px;
}

.hand-label {
  font-size: 0.75rem;
  text-align: center;
  margin-bottom: 8px;
  color: #c0a878;
  white-space: nowrap;
}

.hand-pieces {
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: center;
}

.hand-piece {
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 4px;
  transition: background 0.15s;
  user-select: none;
}

.hand-piece:hover {
  background: rgba(221, 184, 122, 0.2);
}

.hand-piece.selected {
  background: var(--highlight-selected);
}

.hand-piece .piece-mini {
  width: calc(var(--cell-size) * 0.55);
  height: calc(var(--cell-size) * 0.62);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: calc(var(--cell-size) * 0.3);
  font-weight: bold;
  color: var(--piece-text);
  background: var(--piece-bg);
  clip-path: polygon(50% 0%, 93% 22%, 93% 100%, 7% 100%, 7% 22%);
}

.hand-piece .piece-mini.gote-piece {
  transform: rotate(180deg);
}

.hand-piece .piece-count {
  font-size: 0.8rem;
  color: #e0d5c5;
  min-width: 1.2em;
  text-align: center;
}

/* Board Container */
#board-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.column-labels {
  display: grid;
  grid-template-columns: repeat(9, var(--cell-size));
  padding-left: 1.5em;
  margin-bottom: 2px;
}

.column-labels span {
  text-align: center;
  font-size: 0.75rem;
  color: #a89070;
}

#board-wrapper {
  display: flex;
  align-items: stretch;
}

.row-labels {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  padding-right: 4px;
}

.row-labels span {
  font-size: 0.75rem;
  color: #a89070;
  display: flex;
  align-items: center;
  height: var(--cell-size);
}

/* Board */
#board {
  display: grid;
  grid-template-columns: repeat(9, var(--cell-size));
  grid-template-rows: repeat(9, var(--cell-size));
  background: var(--board-color);
  border: 3px solid var(--board-shadow);
  box-shadow:
    0 0 0 1px var(--board-line),
    0 8px 32px rgba(0, 0, 0, 0.5),
    inset 0 0 60px rgba(139, 105, 20, 0.15);
  position: relative;
}

.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  border: 1px solid var(--board-line);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  transition: background 0.1s;
}

.cell:hover {
  background: rgba(139, 105, 20, 0.15);
}

.cell.selected {
  background: var(--highlight-selected);
}

.cell.movable {
  background: var(--highlight-move);
}

.cell.movable::after {
  content: '';
  position: absolute;
  width: 30%;
  height: 30%;
  border-radius: 50%;
  background: rgba(66, 133, 244, 0.5);
}

.cell.movable.has-enemy::after {
  width: 85%;
  height: 85%;
  border-radius: 4px;
  background: rgba(244, 67, 54, 0.25);
  border: 2px solid rgba(244, 67, 54, 0.5);
}

.cell.last-move-from,
.cell.last-move-to {
  background: var(--highlight-last-move);
}

/* Star points (hoshi) */
.cell.star::before {
  content: '';
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--board-line);
  z-index: 1;
  top: -4px;
  left: -4px;
}

/* Pieces */
.piece {
  width: calc(var(--cell-size) * 0.82);
  height: calc(var(--cell-size) * 0.88);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--piece-font-size);
  font-weight: bold;
  color: var(--piece-text);
  background: var(--piece-bg);
  clip-path: polygon(50% 0%, 93% 22%, 93% 100%, 7% 100%, 7% 22%);
  position: relative;
  z-index: 2;
  user-select: none;
  text-shadow: none;
  transition: transform 0.08s;
  box-shadow: 1px 1px 2px rgba(0,0,0,0.2);
}

.piece.promoted {
  color: var(--piece-promoted);
}

.piece.gote {
  transform: rotate(180deg);
}

.piece:hover {
  filter: brightness(1.05);
}

/* Controls */
#controls {
  margin-top: 8px;
}

#controls button,
.dialog-content button {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 8px 24px;
  background: linear-gradient(180deg, #8B7355, #6B5335);
  color: #f0e6d6;
  border: 1px solid #a08560;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
}

#controls button:hover,
.dialog-content button:hover {
  background: linear-gradient(180deg, #9B8365, #7B6345);
}

#controls button:active,
.dialog-content button:active {
  transform: translateY(1px);
}

/* Dialogs */
.dialog {
  position: fixed;
  inset: 0;
  background: var(--dialog-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(2px);
}

.dialog.hidden {
  display: none;
}

.dialog-content {
  background: linear-gradient(180deg, #3a2a1a, #2a1a0a);
  border: 2px solid #8B7355;
  border-radius: 8px;
  padding: 28px 36px;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
}

.dialog-content p {
  font-size: 1.2rem;
  margin-bottom: 20px;
  color: #e8d5b5;
}

.dialog-content button {
  margin: 0 8px;
  min-width: 80px;
}

/* Responsive */
@media (max-width: 640px) {
  :root {
    --cell-size: min(10vw, 52px);
  }

  #game-area {
    flex-direction: column;
    align-items: center;
    gap: 10px;
  }

  .hand-area {
    min-height: auto;
    min-width: auto;
    width: 100%;
    max-width: calc(var(--cell-size) * 9 + 2em);
  }

  .hand-pieces {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
  }

  #header h1 {
    font-size: 1.4rem;
  }
}

@media (max-width: 400px) {
  :root {
    --cell-size: min(10.5vw, 40px);
  }
}

/* AI思考中表示 */
.ai-thinking {
  text-align: center;
  padding: 8px 20px;
  color: #e8d5b5;
  font-size: 1rem;
}

.ai-thinking.hidden {
  display: none;
}

/* モード選択・先手後手選択ダイアログのボタン */
#mode-dialog .dialog-content button,
#side-dialog .dialog-content button {
  display: block;
  width: 100%;
  margin: 8px 0;
  min-width: 200px;
}