* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  background: #f3f5f7;
  color: #1f2933;
}

.page {
  min-height: 100vh;
  padding: 32px 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card {
  width: 100%;
  max-width: 960px;
  background: #ffffff;
  border-radius: 20px;
  padding: 28px;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.08);
}

.header {
  text-align: center;
  margin-bottom: 24px;
}

.tag {
  margin: 0 0 8px;
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #4b5563;
}

h1 {
  margin: 0;
  font-size: 30px;
  line-height: 1.35;
}

.desc {
  max-width: 720px;
  margin: 14px auto 0;
  font-size: 16px;
  line-height: 1.7;
  color: #4b5563;
}

.video-box {
  width: 100%;
  border-radius: 16px;
  overflow: hidden;
  background: #000;
}

video {
  display: block;
  width: 100%;
  max-height: 72vh;
  background: #000;
}

.info {
  margin-top: 20px;
  padding: 16px 18px;
  border-radius: 14px;
  background: #f8fafc;
  font-size: 15px;
  line-height: 1.7;
  color: #374151;
}

.info p {
  margin: 4px 0;
}

@media (max-width: 640px) {
  .card {
    padding: 18px;
    border-radius: 16px;
  }

  h1 {
    font-size: 23px;
  }

  .desc {
    font-size: 14px;
  }

  .info {
    font-size: 14px;
  }
}