.glass {
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(16px) saturate(120%);
  -webkit-backdrop-filter: blur(16px) saturate(120%);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 18px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  padding: 12px;
  margin: 8px;
}

/* Liquid Glass 效果 - 更強烈的玻璃擬物風格 */
.liquid-glass {
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 20px;
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.5),
    inset 0 -1px 0 rgba(255, 255, 255, 0.2);
  position: relative;
  overflow: hidden;
}

.liquid-glass::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  transition: left 0.5s;
}

.liquid-glass:hover::before {
  left: 100%;
}

/* 底部導覽列的液態玻璃效果 */
.bottom-nav.liquid-glass {
  background: rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(30px) saturate(200%);
  -webkit-backdrop-filter: blur(30px) saturate(200%);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 999px;
  box-shadow: 
    0 4px 24px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);
}