html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}

.container {
  width: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5vh;
  padding: 0;
  box-sizing: border-box;
  background: #387fbb;
  background-size: cover;
}

.video_container {
  max-width: 70%;
  flex-shrink: 0;
  box-sizing: border-box;
  user-select: none;
  -webkit-user-select: none;
}

.video-wrap {
  position: relative;
  line-height: 0;
  font-size: 0;
}

/* 仅用 width + height:auto 等比缩放；勿加 object-fit（WebKit 会偏裁右侧黑边） */
.video_demo {
  width: 100%;
  height: auto;
  display: block;
  pointer-events: none;
  -webkit-user-drag: none;
  -webkit-touch-callout: none;
  user-select: none;
  -webkit-user-select: none;
}

.video-touch-layer {
  position: absolute;
  inset: 0;
  z-index: 1;
  touch-action: manipulation;
  -webkit-touch-callout: none;
  user-select: none;
  -webkit-user-select: none;
  cursor: pointer;
}

.tip{
  width: 80%;
  display: block;
  margin: 0 auto;
  user-select: none;
  -webkit-user-select: none;
  -webkit-user-drag: none;
}

.is-hidden {
  display: none !important;
}

.download-loading {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.45);
}

.download-loading__spinner {
  width: 44px;
  height: 44px;
  border: 3px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: download-spin 0.75s linear infinite;
}

@keyframes download-spin {
  to {
    transform: rotate(360deg);
  }
}