/* 全屏画布，没有滚动条 */
html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #14215e;
  color: #f6e9b8;
  font-family: Georgia, "Songti SC", "SimSun", "PingFang SC", "Microsoft YaHei", serif;
}

canvas {
  display: block;
}

/* 开始界面：浏览器只允许在点击之后打开摄像头和声音 */
#intro {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #14215e;
  z-index: 10;
  padding: 16px;
  overflow-y: auto;
}

.card {
  max-width: 580px;
  padding: 28px 32px;
  background: rgba(20, 33, 94, 0.88);
  border: 2px solid #f2d34f;
  border-radius: 10px;
  text-align: center;
}

.card h1 {
  font-size: clamp(2.6rem, 10vw, 4.8rem);
  margin: 0;
  letter-spacing: 0.12em;
  font-weight: normal;
}

.sub {
  margin: 4px 0 20px;
  opacity: 0.8;
}

.card ul {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  line-height: 1.9;
  text-align: left;
}

kbd {
  border: 1px solid currentColor;
  border-radius: 4px;
  padding: 0 6px;
  font-size: 0.85em;
}

#start {
  font-family: inherit;
  font-size: 1.2rem;
  padding: 12px 36px;
  border: none;
  border-radius: 6px;
  background: #f2d34f;
  color: #14215e;
  cursor: pointer;
  letter-spacing: 0.15em;
}

#start:hover {
  filter: brightness(1.15);
}

/* 角落里的状态提示 */
#status {
  position: fixed;
  left: 16px;
  bottom: 12px;
  font-size: 0.9rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(20, 33, 94, 0.88);
  pointer-events: none;
  max-width: calc(100vw - 48px);
}