/* ===== 基础页面 ===== */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #0a0f28;
  font-family: Arial, Helvetica, sans-serif;
}

/* ===== 封面背景 ===== */
#intro {
  position: fixed;
  inset: 0;
  z-index: 10;

  display: flex;
  align-items: center;
  justify-content: center;

  padding: 40px;
  text-align: center;
  color: #f5f0e6;

  background:
    radial-gradient(
      ellipse at 50% 38%,
      rgba(54, 75, 137, 0.85) 0%,
      rgba(27, 43, 93, 0.8) 30%,
      rgba(10, 22, 56, 0.95) 65%,
      #070d25 100%
    );
}

/* ===== 封面文字 ===== */
.intro-panel {
  width: 100%;
  max-width: 800px;
}

.intro-tag {
  margin-bottom: 22px;
  font-size: 12px;
  letter-spacing: 4px;
  color: #aebddd;
}

.intro-panel h1 {
  margin: 0;
  font-size: clamp(56px, 7vw, 100px);
  font-weight: 700;
  letter-spacing: -2px;
  line-height: 1.05;
  color: #f8f3e8;
}

.intro-artist {
  margin: 16px 0 40px;
  font-size: 17px;
  font-style: italic;
  color: #c5c6d1;
}

/* ===== 操作说明 ===== */
.intro-text {
  margin: 0 auto 35px;
}

.intro-text p {
  margin: 12px 0;
  font-size: 16px;
  line-height: 1.8;
  color: #e3e5ed;
}

.intro-text strong {
  color: #ffffff;
}

.keys {
  margin-top: 20px !important;
  font-size: 14px !important;
  color: #b6bfd2 !important;
}

.keys span {
  display: inline-block;
  padding: 2px 8px;
  margin: 0 4px;
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 5px;
  color: #f4d381;
  background: rgba(255,255,255,0.05);
}

/* ===== 开始按钮 ===== */
#start {
  padding: 17px 38px;
  border: none;
  border-radius: 50px;

  background: linear-gradient(
    135deg,
    #ffe3a0,
    #e5b95e
  );

  color: #172039;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;

  box-shadow: 0 10px 35px rgba(0,0,0,0.3);
  transition: all 0.3s ease;
}

#start:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(0,0,0,0.4);
  background: #ffe4a0;
}

/* ===== 摄像头状态 ===== */
#status {
  position: fixed;
  bottom: 18px;
  left: 20px;
  z-index: 5;
  font-size: 12px;
  color: #aebbd0;
}

/* ===== 小屏幕适配 ===== */
@media (max-width: 600px) {
  #intro {
    padding: 25px;
  }

  .intro-panel h1 {
    font-size: 52px;
  }

  .intro-text p {
    font-size: 14px;
  }
}


/* ===== 封面字体精简版 ===== */

.intro-tag {
  font-size: 10px;
  letter-spacing: 3px;
  margin-bottom: 20px;
}

.intro-panel h1 {
  font-size: clamp(42px, 5vw, 64px);
  letter-spacing: -1px;
  line-height: 1.1;
}

.intro-artist {
  font-size: 14px;
  margin: 12px 0 30px;
}

.intro-text {
  margin-bottom: 28px;
}

.intro-text p {
  font-size: 14px;
  line-height: 1.6;
  margin: 10px 0;
}

.intro-text .keys {
  font-size: 12px !important;
  margin-top: 16px;
}

.keys span {
  font-size: 11px;
  padding: 2px 6px;
}

#start {
  font-size: 14px;
  padding: 14px 30px;
}

/* 手机等较窄屏幕 */
@media (max-width: 600px) {
  .intro-panel h1 {
    font-size: clamp(36px, 9vw, 48px);
  }
}