.clock {
  /* 定位到左上角 */
  position: fixed;
  top: clamp(12px, 2.2vh, 20px);
  left: clamp(12px, 2.2vw, 20px);
  z-index: 1000;
  
  /* 调整大小与右上角按钮相匹配 */
  height: clamp(1.8rem, 3.5vh, 2.5rem);
  font-size: clamp(1.6rem, 3.2vh, 2.3rem);
  line-height: clamp(1.8rem, 3.5vh, 2.5rem);
  
  /* 保持原有样式 */
  color: white;
  font-family: sans-serif;
  display: flex;
  overflow: hidden;
  
  /* 添加背景和边框使其可见 */
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  padding: clamp(4px, 1vh, 8px) clamp(8px, 1.5vw, 12px);
}

.clock::before, .clock::after {
  content: '';
  width: 100%;
  height: clamp(0.3rem, 0.6vh, 0.5rem);
  background: linear-gradient(to top, transparent, rgba(0, 0, 0, 0.3));
  position: absolute;
  z-index: 2;
  left: 0;
}

.clock::after {
  bottom: 0;
  background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.3));
}

.clock > div {
  display: flex;
}

.tick {
  line-height: clamp(1.8rem, 3.5vh, 2.5rem);
  padding: 0 clamp(2px, 0.4vw, 4px);
}

.tick-hidden {
  opacity: 0;
}

.move {
  animation: move linear 1s infinite;
}

@keyframes move {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(clamp(-1.8rem, -3.5vh, -2.5rem));
  }
}

/* 移动端适配 */
@media (max-width: 768px) {
  .clock {
    font-size: clamp(1.2rem, 3vw, 1.6rem);
    height: clamp(1.4rem, 3vh, 1.8rem);
    line-height: clamp(1.4rem, 3vh, 1.8rem);
    padding: clamp(3px, 0.8vh, 6px) clamp(6px, 1.2vw, 10px);
  }
  
  .tick {
    line-height: clamp(1.4rem, 3vh, 1.8rem);
  }
  
  @keyframes move {
    from {
      transform: translateY(0);
    }
    to {
      transform: translateY(clamp(-1.4rem, -3vh, -1.8rem));
    }
  }
}

/* For narrower screens (<=2000px) move clock to bottom-left to avoid overlapping top-centered elements */
@media (max-width: 960px) {
  .clock {
    top: auto;
    left: 8px;
    right: auto;
    bottom: 8px;
    z-index: 1100; /* above many elements but below gt-wrapper if needed */
    /* keep compact sizing for very small screens */
    font-size: clamp(1rem, 3vw, 1.4rem);
    height: clamp(1.2rem, 3vh, 1.6rem);
    line-height: clamp(1.2rem, 3vh, 1.6rem);
    padding: 6px 8px;
  }
}