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

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  background: radial-gradient(ellipse at top, #3a6b4f 0%, #1f3d2e 55%, #14291f 100%);
  padding: 20px;
  user-select: none;
}

.game-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  background: linear-gradient(160deg, #2b4a38, #1e3528);
  border: 2px solid #b08d4f;
  border-radius: 18px;
  padding: 24px 30px 26px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

h1 {
  color: #f3e3c3;
  font-size: 26px;
  letter-spacing: 4px;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
}

.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0 4px;
}

.status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  color: #f3e3c3;
  font-weight: 600;
}

.dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

.black-dot { background: radial-gradient(circle at 35% 30%, #555, #0a0a0a); }
.white-dot { background: radial-gradient(circle at 35% 30%, #fff, #c9c9c9); }

.score {
  font-size: 14px;
  color: #cbb98f;
}

.score b {
  color: #f3e3c3;
  font-size: 16px;
}

.board-wrap {
  background: linear-gradient(145deg, #e2b06e, #c8904f);
  border-radius: 10px;
  padding: 10px;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.45), 0 6px 18px rgba(0, 0, 0, 0.4);
}

canvas {
  display: block;
  border-radius: 4px;
  cursor: pointer;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  margin-top: 2px;
  width: 100%;
}

/* 模式选择按钮组 */
.mode-group {
  display: flex;
  gap: 6px;
  padding: 5px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 13px;
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.35);
}

.mode-btn {
  background: transparent;
  color: #cbb98f;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 8px 15px;
  border-radius: 9px;
}

.mode-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #f3e3c3;
}

.mode-btn.active {
  background: linear-gradient(145deg, #e0ac4e, #b57f22);
  color: #fff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.btn-row {
  display: flex;
  gap: 12px;
}

button {
  font-family: inherit;
  font-size: 15px;
  border: none;
  border-radius: 8px;
  padding: 9px 18px;
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.15s ease, background 0.15s ease;
}

button:hover { background: #f6e6c0; }

button:active { transform: scale(0.95); }

button.primary {
  background: linear-gradient(145deg, #d9a441, #b57f22);
  color: #fff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
}

button.primary:hover { background: linear-gradient(145deg, #e6b253, #c58c28); }

/* 胜负弹窗 */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}

.modal.hidden { display: none; }

.modal-box {
  background: linear-gradient(160deg, #f6e7c6, #e7cf9d);
  border-radius: 16px;
  padding: 34px 48px;
  text-align: center;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
  animation: pop 0.25s ease;
}

@keyframes pop {
  from { transform: scale(0.8); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}

.result-title {
  font-size: 30px;
  font-weight: 800;
  color: #5b3a10;
  margin-bottom: 8px;
}

.result-sub {
  font-size: 15px;
  color: #8a6a35;
  margin-bottom: 22px;
}

@media (max-width: 520px) {
  .game-container { padding: 16px; }
  h1 { font-size: 20px; }
  button { font-size: 13px; padding: 8px 12px; }
  .mode-btn { font-size: 12px; padding: 7px 10px; }
  .controls { flex-wrap: wrap; justify-content: center; }
}