* {
  box-sizing: border-box;
}

:root {
  --bg: #f4efe6;
  --panel: #fffaf2;
  --ink: #2c241b;
  --muted: #6b5e4e;
  --accent: #3d6b4f;
  --accent-hover: #2f5540;
  --line: #c9b89a;
  --board: #e2b86a;
  --shadow: 0 8px 24px rgba(60, 40, 20, 0.12);
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: radial-gradient(circle at top, #faf6ef, var(--bg));
  color: var(--ink);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}

.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px 14px 28px;
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.header h1 {
  margin: 0;
  font-size: 1.55rem;
  letter-spacing: 0.04em;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel);
  font-size: 0.85rem;
  flex-shrink: 0;
}

.lang-btn {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--muted);
  font: inherit;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
}

.lang-btn[aria-pressed="true"] {
  color: var(--accent);
  font-weight: 700;
}

.lang-btn:hover {
  color: var(--ink);
}

.lang-sep {
  color: var(--line);
  user-select: none;
}

.sub {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 16px;
  padding: 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.field {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
}

.field select {
  font: inherit;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
}

.btn {
  appearance: none;
  border: none;
  border-radius: 8px;
  padding: 9px 14px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  cursor: pointer;
}

.btn:hover {
  background: var(--accent-hover);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-secondary {
  background: #6d5843;
}

.btn-secondary:hover {
  background: #574532;
}

.status {
  margin: 12px 0;
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(61, 107, 79, 0.08);
  border: 1px solid rgba(61, 107, 79, 0.18);
  font-size: 0.98rem;
  font-weight: 600;
}

.board-wrap {
  width: 100%;
  max-width: min(92vw, 600px);
  margin: 0 auto;
  aspect-ratio: 1 / 1;
  background: var(--board);
  border-radius: 10px;
  box-shadow: var(--shadow);
  overflow: hidden;
  border: 2px solid #b8873d;
  touch-action: manipulation;
}

#board {
  display: block;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.hint {
  margin: 12px 4px 0;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.5;
}

@media (max-width: 420px) {
  .app {
    padding: 12px 10px 24px;
  }
  .header h1 {
    font-size: 1.35rem;
  }
  .toolbar {
    gap: 8px;
  }
}


.status-win {
  animation: status-win-pulse 1.1s ease-in-out 2;
  background: rgba(255, 193, 7, 0.18);
  border-color: rgba(230, 160, 20, 0.55);
  color: #5a3d00;
}

.board-win {
  box-shadow: 0 0 0 3px rgba(255, 214, 64, 0.55), var(--shadow);
  animation: board-win-glow 1.2s ease-in-out 2;
}

@keyframes status-win-pulse {
  0%, 100% { transform: scale(1); }
  40% { transform: scale(1.02); }
  70% { transform: scale(1.015); }
}

@keyframes board-win-glow {
  0%, 100% { box-shadow: 0 0 0 2px rgba(255, 214, 64, 0.35), var(--shadow); }
  50% { box-shadow: 0 0 0 5px rgba(255, 214, 64, 0.7), 0 8px 28px rgba(200, 140, 20, 0.28); }
}