/* 进度条  */
.progress-bar {
    position: fixed;
    bottom: 5px;
    left: 0;
    width: 100%;
    height: 8px;
    background: transparent;
    z-index: 9999;
    overflow: visible !important;
    border-radius: 999px;
    /* box-shadow: inset 0 1px 2px rgba(0,0,0,0.12); */
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease, visibility 0.5s ease;
  }
  
  .progress-bar.loaded {
    opacity: 1;
    visibility: visible;
  }
  
  .progress-bar span {
    display: block;
    height: 100%;
    /* red fill with subtle gradient + moving sheen stripes */
    background-color: #8884ef;
    background-size: 40px 100%, 100% 100%;
    background-position: 0 0, 0 0;
    width: 0%;
    position: relative; /* 设置相对定位 */
    border-radius: 999px;
    /* box-shadow: 0 0 8px rgba(216, 0, 0, 0.25); */
    animation: progressStripes 3s linear infinite;
  }

  .progress-bar span::after {
    content: '';
    position: absolute;
    top: 50%;
    right: -26px;
    transform: translateY(-90%);
    width: 60px;
    height: 70px;
   
    background-size: cover;
    transition: transform 0.2s ease-out;
    filter: drop-shadow(0 1px 1px rgba(0,0,0,0.15));
    animation: iconBob 2.4s ease-in-out infinite;
  }

@keyframes progressStripes {
  0% { background-position: 0 0, 0 0; }
  100% { background-position: 40px 0, 0 0; }
}

@keyframes iconBob {
  0%, 100% { transform: translateY(-84%); }
  50% { transform: translateY(-90%); }
}

/* Reduced motion support for progress bar */
@media (prefers-reduced-motion: reduce) {
  .progress-bar span { animation: none; }
  .progress-bar span::after { animation: none; transition: none; }
}



/* 进度条 */
.diy-totop {
    position: fixed;
    right: 0;
    bottom: 20px;
    transition: transform 0.25s ease, filter 0.25s ease;
    transform: translateY(0) rotate(0deg);
    width: 200px;
    z-index: 999999;
  }
  .diy-totop:hover {
    transform: translateY(5px) ;
    filter: drop-shadow(0 4px 6px rgba(0,0,0,0.18));
  }
  #totopLink {
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px) scale(0.98);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
  }
  
  /* 页面未加载完成时，强制隐藏 */
  body:not(.page-loaded) #totopLink {
    opacity: 0 !important;
    visibility: hidden !important;
  }
  
  /* 页面加载完成后，根据滚动位置显示/隐藏 */
  body.page-loaded #totopLink.diy-show {
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) scale(1);
  }

  /* Gentle float animation when visible */
  #totopLink.diy-show .diy-totop {
    /* animation: totopFloat 3s ease-in-out infinite, totopShadow 3s ease-in-out infinite; */
    filter: drop-shadow(0 2px 3px rgba(0,0,0,0.14));
  }

  @keyframes totopFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
  }
  @keyframes totopShadow {
    0%, 100% { filter: drop-shadow(0 2px 3px rgba(0,0,0,0.14)); }
    50% { filter: drop-shadow(0 5px 8px rgba(0,0,0,0.22)); }
  }

  /* Respect reduced-motion */
  @media (prefers-reduced-motion: reduce) {
    #totopLink.diy-show .diy-totop { animation: none; }
    .diy-totop { transition: none; }
  }