:root{
    --gap: 14px;
    --radius: 14px;
    --shadow: 0 4px 14px rgba(20, 30, 60, .08);
    --shadow-hover: 0 12px 30px rgba(20, 30, 60, .18);
    --text: #1f2430;
    --muted: #8b93a7;
    --bg: #f5f7fb;
    --brand: #2f6fed;
  }

  *{ box-sizing: border-box; }

  body{
    margin: 0;
    padding: 48px 24px 72px;
    background: var(--bg);
    color: var(--text);
    font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB",
                 "Microsoft YaHei", system-ui, sans-serif;
    -webkit-font-smoothing: antialiased;
  }

  /* ================= 画廊 ================= */
  .gallery{
    max-width: 1180px;
    margin: 0 auto;
  }

  .gallery__section + .gallery__section{
    margin-top: 56px;
  }

  .gallery__title{
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0 0 22px;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: .4px;
  }

  .gallery__title::before{
    content: "";
    width: 5px;
    height: 22px;
    border-radius: 3px;
    background: linear-gradient(180deg, #5b93ff, var(--brand));
  }

  .gallery__title small{
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--muted);
  }

  .gallery__grid{
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--gap);
  }

  /* ---------- 图片卡片（按钮） ---------- */
  .gallery__item{
    position: relative;
    display: block;
    width: 100%;
    margin: 0;
    padding: 0;
    border: 0;
    font: inherit;
    overflow: hidden;
    border-radius: var(--radius);
    background: #fff;
    box-shadow: var(--shadow);
    aspect-ratio: 1 / 1;
    cursor: zoom-in;                /* 放大镜光标 */
    -webkit-appearance: none;
    appearance: none;
    transition: transform .28s ease, box-shadow .28s ease;
  }

  .gallery__item img{
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .55s cubic-bezier(.2, .7, .3, 1);
  }

  .gallery__item::after{
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, .3), transparent 58%);
    opacity: 0;
    transition: opacity .28s ease;
    pointer-events: none;
  }

  .gallery__item:hover{
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
  }

  .gallery__item:hover img{ transform: scale(1.07); }
  .gallery__item:hover::after{ opacity: 1; }

  .gallery__item:focus-visible{
    outline: 2px solid var(--brand);
    outline-offset: 3px;
  }

  /* ================= 灯箱 ================= */
  .lightbox{
    position: fixed;
    inset: 0;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 64px 24px;
    background: rgba(10, 14, 24, .9);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    opacity: 0;
    visibility: hidden;
    overscroll-behavior: contain;
    transition: opacity .25s ease, visibility .25s ease;
  }

  .lightbox.is-open{
    opacity: 1;
    visibility: visible;
  }

  .lightbox__img{
    max-width: 100%;
    max-height: calc(100vh - 128px);
    border-radius: 10px;
    box-shadow: 0 24px 60px rgba(0, 0, 0, .55);
    cursor: default;
    user-select: none;
    -webkit-user-drag: none;
    transform: scale(.96);
    transition: transform .25s ease;
  }

  .lightbox.is-open .lightbox__img{ transform: scale(1); }

  /* 关闭 / 翻页按钮 */
  .lightbox__close,
  .lightbox__nav{
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 0;
    padding: 0;
    color: #fff;
    background: rgba(255, 255, 255, .14);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    border-radius: 50%;
    cursor: pointer;
    line-height: 1;
    transition: background .2s ease, transform .2s ease;
  }

  .lightbox__close{
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    font-size: 26px;
  }

  .lightbox__nav{
    top: 50%;
    width: 48px;
    height: 48px;
    font-size: 30px;
    transform: translateY(-50%);
  }

  .lightbox__nav--prev{ left: 18px; }
  .lightbox__nav--next{ right: 18px; }

  .lightbox__close:hover,
  .lightbox__nav:hover{
    background: rgba(255, 255, 255, .3);
  }

  .lightbox__nav--prev:hover{ transform: translateY(-50%) scale(1.08); }
  .lightbox__nav--next:hover{ transform: translateY(-50%) scale(1.08); }

  .lightbox__close:focus-visible,
  .lightbox__nav:focus-visible{
    outline: 2px solid #fff;
    outline-offset: 2px;
  }

  /* 计数 */
  .lightbox__counter{
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, .78);
    font-size: 13px;
    letter-spacing: 1.2px;
    pointer-events: none;
  }

  /* ================= 响应式 ================= */
  @media (max-width: 640px){
    body{ padding: 28px 14px 48px; }
    :root{ --gap: 10px; --radius: 10px; }

    .gallery__grid{
      grid-template-columns: repeat(auto-fill, minmax(126px, 1fr));
    }
    .gallery__title{ font-size: 18px; margin-bottom: 16px; }
    .gallery__title::before{ height: 18px; }

    .lightbox{ padding: 56px 12px; }
    .lightbox__img{ max-height: calc(100vh - 112px); }
    .lightbox__nav{ width: 40px; height: 40px; font-size: 24px; }
    .lightbox__nav--prev{ left: 8px; }
    .lightbox__nav--next{ right: 8px; }
    .lightbox__close{ top: 12px; right: 12px; width: 38px; height: 38px; font-size: 22px; }
  }

  /* 尊重系统「减少动态效果」 */
  @media (prefers-reduced-motion: reduce){
    *{ transition: none !important; animation: none !important; }
  }