:root {
  --bg: #f3f0e8;
  --panel: #fffdf7;
  --line: #c7b28b;
  --text: #2f2a1f;
  --accent: #6d4f2c;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 20px;
}

h1 {
  text-align: center;
  margin-bottom: 16px;
}

.panel {
  background: var(--panel);
  border: 1px solid #e4d9bf;
  border-radius: 10px;
  padding: 14px;
  margin-bottom: 14px;
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

button {
  border: none;
  border-radius: 8px;
  padding: 9px 14px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}

button:hover {
  opacity: 0.9;
}

input {
  margin-left: 6px;
  border: 1px solid #c8b895;
  border-radius: 6px;
  padding: 8px;
}

.board-wrap {
  background: #d9b16f;
  border: 3px solid #b68948;
  border-radius: 8px;
  overflow: auto;
}

#board {
  display: block;
  margin: 0 auto;
  touch-action: none;
}