body {
  margin: 0;
  font-family: 'Segoe UI', 'Microsoft YaHei', Arial, sans-serif;
  background: #f5f6fa;
}
.container {
  display: flex;
  height: 100vh;
}
.sidebar {
  width: 160px;
  background: #222c36;
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 0 0 0;
  box-shadow: 2px 0 8px #0001;
}
.sidebar h2 {
  font-size: 1.2em;
  margin-bottom: 24px;
}
.emoji-menu {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.emoji-btn {
  font-size: 2.2em;
  background: #fff2;
  border: none;
  border-radius: 8px;
  padding: 10px 0;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}
.emoji-btn.selected, .emoji-btn:hover {
  background: #fff5;
  transform: scale(1.1);
}
.tip {
  margin-top: 32px;
  font-size: 0.95em;
  color: #b0b8c1;
}
.main {
  flex: 1;
  display: flex;
  align-items: stretch;
  justify-content: stretch;
  background: #e9ecf3;
  position: relative;
}
#battle-canvas {
  width: 100%;
  height: 100%;
  display: block;
  background: #fff;
  border-radius: 0 0 0 0;
  box-shadow: 0 0 16px #0001 inset;
}