.back-to-top {
    position: fixed;
    bottom: 104px;
    right: 28px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #000e27;
    color: #fff;
    border: 1px solid #fff;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(0, 14, 39, 0.35);
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px) scale(0.9);
    transition: opacity .3s ease, visibility .3s ease, transform .3s ease, background .2s ease;
  }
  .back-to-top.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
  }
  .back-to-top:hover { background: #7D5722; transform: translateY(-3px) scale(1.05); }
  .back-to-top:active { background: #7D5722; transform: translateY(0) scale(.95); }
  .back-to-top:focus-visible { outline: 3px solid rgba(125, 87, 34, .4); outline-offset: 3px; }
  .back-to-top svg {
    width: 22px; height: 22px;
    stroke: currentColor; stroke-width: 2.5; fill: none;
    stroke-linecap: round; stroke-linejoin: round;
  }
  @media (prefers-reduced-motion: reduce) {
    .back-to-top,
    .back-to-top.is-visible,
    .back-to-top:hover { transition: opacity .2s ease, visibility .2s ease; transform: none; }
  }