/* ==========================================================================
   EndlessLoop · 照片墙样式（Bento Grid 摄影画廊版）
   --------------------------------------------------------------------------
   结构由 scripts/photo-wall.js 的 {% photowall %} 输出：
     - .photo-wall__index > .photo-wall__bento > .photo-wall__card  （分类首页）
     - .photo-wall__gallery > .photo-wall__section > .photo-wall__masonry  （画廊）
   交互由 source/js/photo-wall.js 驱动（卡片↔画廊、灯箱）。

   设计语言：不规则 Bento Grid + 半透明深色毛玻璃信息框，浅色简洁背景，
   图片铺满卡片（object-fit: cover，不拉伸），hover 轻微放大 + 亮度变化。
   复用 custom.css 的设计令牌（--el-*）。
   ========================================================================== */

/* -------------------------------------------------------------------------
   0. 容器：舒适阅读宽度 + 左右留白
   ------------------------------------------------------------------------- */
.photo-wall {
  max-width: 1120px;
  margin: 0 auto;
}

/* -------------------------------------------------------------------------
   1. 分类首页 · Bento Grid
   ------------------------------------------------------------------------- */
.photo-wall__bento {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-auto-rows: 92px;
  gap: 18px;
}

/* 卡片尺寸档位（grid-row 跨度，形成大小不一、有层次的拼贴） */
.photo-wall__card--hero { grid-column: 1 / -1; grid-row: span 6; }
.photo-wall__card--tall { grid-row: span 5; }
.photo-wall__card--med  { grid-row: span 4; }
.photo-wall__card--wide { grid-column: 1 / -1; grid-row: span 4; }

.photo-wall__card {
  position: relative;
  overflow: hidden;
  border: none;
  border-radius: 22px;
  padding: 0;
  margin: 0;
  background: #e6e8f0; /* 无封面时的兜底底 */
  color: #fff;
  font: inherit;
  text-align: left;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  /* 一圈极淡的描边，让卡片在浅色背景上有边界感 */
  box-shadow: 0 2px 10px rgba(20, 24, 48, 0.06), 0 18px 40px rgba(20, 24, 48, 0.10);
}

/* 背景照片：绝对定位铺满，cover 不拉伸 */
.photo-wall__card-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s var(--el-ease), filter 0.7s var(--el-ease);
}

/* 卡片底部一点暗化渐变，保证信息框在任何照片上都可读 */
.photo-wall__card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(8, 10, 22, 0) 40%, rgba(8, 10, 22, 0.34) 100%);
  pointer-events: none;
}

/* -------------------------------------------------------------------------
   2. 毛玻璃信息框
   ------------------------------------------------------------------------- */
.photo-wall__card-info {
  position: absolute;
  left: 18px;
  bottom: 18px;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
  max-width: calc(100% - 36px);
  padding: 16px 18px 15px;
  border-radius: 16px;
  background: rgba(12, 14, 26, 0.42);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.32);
  color: #fff;
  transition: transform 0.45s var(--el-ease), background 0.45s var(--el-ease),
    border-color 0.45s var(--el-ease);
}

/* 英文分类名：小字距大写，现代杂志感 */
.photo-wall__card-en {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  opacity: 0.72;
}

/* 中文大标题：醒目、有视觉冲击力 */
.photo-wall__card-zh {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.12;
}

/* 照片数量 */
.photo-wall__card-count {
  margin-top: 4px;
  font-size: 13px;
  font-weight: 500;
  opacity: 0.86;
}

.photo-wall__card-arrow {
  display: inline-block;
  margin-left: 2px;
  font-size: 14px;
  transition: transform 0.35s var(--el-ease);
}

/* hero 卡片的信息框更大，标题更有冲击力 */
.photo-wall__card--hero .photo-wall__card-info {
  padding: 20px 22px 19px;
  border-radius: 18px;
}
.photo-wall__card--hero .photo-wall__card-zh {
  font-size: 34px;
}

/* -------------------------------------------------------------------------
   3. hover / 焦点
   ------------------------------------------------------------------------- */
.photo-wall__card:hover .photo-wall__card-img {
  transform: scale(1.06);
  filter: brightness(1.07);
}

.photo-wall__card:hover .photo-wall__card-info {
  transform: translateY(-4px);
  background: rgba(12, 14, 26, 0.52);
  border-color: rgba(255, 255, 255, 0.26);
}

.photo-wall__card:hover .photo-wall__card-arrow {
  transform: translate(2px, -2px);
}

.photo-wall__card:focus-visible {
  outline: 3px solid hsla(var(--accent-hue), 100%, 81%, 0.85);
  outline-offset: 3px;
}

/* -------------------------------------------------------------------------
   4. 画廊视图
   ------------------------------------------------------------------------- */
.photo-wall__gallery-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 22px;
}

.photo-wall__gallery-back {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px;
  border: 1px solid var(--el-glass-border);
  border-radius: 999px;
  background: var(--el-glass-bg-soft);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--el-text-soft);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: color 0.3s var(--el-ease), border-color 0.3s var(--el-ease),
    transform 0.3s var(--el-ease-back);
}

.photo-wall__gallery-back:hover {
  color: var(--el-sakura-deep);
  border-color: hsla(var(--accent-hue), 100%, 81%, 0.55);
  transform: translateX(-2px);
}

.photo-wall__gallery-back:focus-visible {
  outline: 2px solid hsl(var(--accent-hue), 72%, 46%);
  outline-offset: 2px;
}

.photo-wall__gallery-title {
  margin: 0;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--el-text);
}

/* masonry：自然宽高比，不规则、杂志式照片墙 */
.photo-wall__masonry {
  column-count: 3;
  column-gap: 16px;
}

.photo-wall__item {
  position: relative;
  break-inside: avoid;
  margin: 0 0 16px;
  border-radius: 14px;
  overflow: hidden;
  background: var(--el-grad-main); /* 图片加载前的兜底底 */
  cursor: zoom-in;
  -webkit-tap-highlight-color: transparent;
}

.photo-wall__item img {
  display: block;
  width: 100%;
  height: auto;
  transition: transform 0.6s var(--el-ease), filter 0.6s var(--el-ease);
}

.photo-wall__item:hover img {
  transform: scale(1.04);
  filter: brightness(1.05);
}

.photo-wall__section[hidden] {
  display: none;
}

.photo-wall__empty {
  text-align: center;
  padding: 44px 0;
  color: var(--el-text-mute);
  font-size: 13px;
}

/* -------------------------------------------------------------------------
   5. 灯箱（沿用原结构，微调）
   ------------------------------------------------------------------------- */
.photo-wall-lightbox {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(8, 9, 18, 0.86);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.28s var(--el-ease), visibility 0s linear 0.28s;
}

.photo-wall-lightbox.is-open {
  opacity: 1;
  visibility: visible;
  transition: opacity 0.28s var(--el-ease), visibility 0s;
}

.photo-wall-lightbox__stage {
  position: relative;
  max-width: min(92vw, 1080px);
  max-height: 84vh;
}

.photo-wall-lightbox__img {
  display: block;
  max-width: 100%;
  max-height: 78vh;
  margin: 0 auto;
  border-radius: var(--el-radius-md);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
  object-fit: contain;
}

.photo-wall-lightbox__caption {
  text-align: center;
  color: rgba(255, 255, 255, 0.85);
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.6;
}

.photo-wall-lightbox__btn {
  position: fixed;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: background 0.25s var(--el-ease), transform 0.25s var(--el-ease-back);
}

.photo-wall-lightbox__btn:hover {
  background: rgba(255, 255, 255, 0.26);
  transform: scale(1.1);
}

.photo-wall-lightbox__btn:focus-visible {
  outline: 2px solid var(--el-sakura);
  outline-offset: 2px;
}

.photo-wall-lightbox__close { top: 18px; right: 20px; }
.photo-wall-lightbox__prev { top: 50%; left: 20px; margin-top: -23px; }
.photo-wall-lightbox__next { top: 50%; right: 20px; margin-top: -23px; }

/* -------------------------------------------------------------------------
   6. 响应式
   ------------------------------------------------------------------------- */

/* 平板：画廊两列，bento 行高略小 */
@media screen and (max-width: 900px) {
  .photo-wall__bento {
    grid-auto-rows: 80px;
    gap: 14px;
  }
  .photo-wall__masonry {
    column-count: 2;
  }
}

/* 手机：单列，卡片统一高度（hero 更高一点保持主次） */
@media screen and (max-width: 640px) {
  .photo-wall__bento {
    grid-template-columns: 1fr;
    grid-auto-rows: auto;
    gap: 14px;
  }

  .photo-wall__card--hero,
  .photo-wall__card--tall,
  .photo-wall__card--med,
  .photo-wall__card--wide {
    grid-column: 1 / -1;
    grid-row: span 1;
    aspect-ratio: 3 / 2;
  }

  .photo-wall__card--hero {
    aspect-ratio: 4 / 5;
  }

  .photo-wall__card--hero .photo-wall__card-zh {
    font-size: 28px;
  }

  .photo-wall__card-zh {
    font-size: 22px;
  }

  .photo-wall__masonry {
    column-count: 1;
  }

  .photo-wall__gallery-title {
    font-size: 20px;
  }

  .photo-wall-lightbox {
    padding: 12px;
  }
  .photo-wall-lightbox__prev { left: 8px; }
  .photo-wall-lightbox__next { right: 8px; }
}

/* -------------------------------------------------------------------------
   7. 减少动效
   ------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .photo-wall__card-img,
  .photo-wall__card-info,
  .photo-wall__card-arrow,
  .photo-wall__item img,
  .photo-wall__gallery-back {
    transition: none;
  }
}