/* =========================================================
   TriM3 相册 · 前台样式（Material Design 3 变量）
   ========================================================= */
.album-index, .album-detail { padding: 4px 0 10px; }

/* ---------- 相册列表 ---------- */
.album-index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 18px;
  margin-top: 22px;
}
.album-index-card {
  display: block;
  background: var(--md-sys-color-surface-container-low, #fff);
  border-radius: var(--md-sys-shape-corner-large, 16px);
  overflow: hidden;
  text-decoration: none;
  color: var(--md-sys-color-on-surface);
  transition: transform .22s ease, box-shadow .22s ease;
}
.album-index-card:hover {
  transform: translateY(-4px);
}
.album-index-cover {
  position: relative;
  height: 148px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--md-sys-color-primary-container, #E8EAFF), var(--md-sys-color-surface-container-high, #F2EFFF));
  display: flex; align-items: center; justify-content: center;
}
.album-index-cover img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .4s ease;
}
.album-index-card:hover .album-index-cover img { transform: scale(1.06); }
.album-index-cover .ph { font-size: 40px; color: var(--md-sys-color-primary); opacity: .4; }
.album-index-cnt {
  position: absolute; right: 10px; bottom: 10px;
  background: rgba(0,0,0,.52); color: #fff;
  font-size: 12px; padding: 2px 10px; border-radius: 999px;
  display: inline-flex; align-items: center; gap: 5px;
  backdrop-filter: blur(4px);
}
.album-index-info { padding: 14px 16px 16px; }
.album-index-info h3 {
  font-size: 15px; font-weight: 600; margin: 0 0 3px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.album-index-info p {
  margin: 0; font-size: 12.5px; color: var(--md-sys-color-on-surface-variant);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  min-height: 34px;
}
.album-index-more {
  display: inline-flex; align-items: center; gap: 2px;
  margin-top: 10px; font-size: 12.5px; font-weight: 500;
  color: var(--md-sys-color-primary);
}
.album-empty {
  text-align: center; padding: 70px 16px; color: var(--md-sys-color-on-surface-variant);
}
.album-empty i { font-size: 56px; display: block; margin-bottom: 12px; opacity: .4; }
.album-empty p { font-size: 14px; margin: 0; }

/* ---------- 首页导航局部渲染：相册（瀑布流懒加载） ---------- */
.album-detail-local { padding: 4px 0 10px; }
.album-local-head {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px;
  padding: 8px 0 14px;
}
.album-local-head h2 {
  margin: 0; font-size: 19px; font-weight: 700; letter-spacing: .2px;
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--md-sys-color-on-surface);
}
.album-local-head h2 i { color: var(--md-sys-color-primary); }
.album-local-head p {
  margin: 0; font-size: 13.5px; color: var(--md-sys-color-on-surface-variant);
  flex-basis: 100%;
}
.album-local-count {
  font-size: 12.5px; color: var(--md-sys-color-on-surface-variant);
  padding: 3px 12px; border-radius: 999px;
  background: var(--md-sys-color-surface-container-low, #fff);
  margin-left: auto;
}
.album-local-list { padding: 4px 0 10px; }
.album-local-group { margin: 0 0 26px; }
.album-local-group-title {
  display: flex; align-items: center; gap: 10px;
  margin: 0 0 14px; padding-bottom: 10px;
  font-size: 16.5px; font-weight: 700; letter-spacing: .2px;
  color: var(--md-sys-color-on-surface);
  border-bottom: 1px solid var(--md-sys-color-outline-variant, rgba(0,0,0,.08));
}
.album-local-group-title span {
  font-size: 12.5px; font-weight: 500; color: var(--md-sys-color-on-surface-variant);
  padding: 2px 10px; border-radius: 999px;
  background: var(--md-sys-color-surface-container-low, #fff);
}

/* ---------- 相册详情头部 ---------- */
.album-head { padding: 6px 0 4px; }
.album-back {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 13px; color: var(--md-sys-color-on-surface-variant);
  text-decoration: none; margin-bottom: 12px;
  padding: 5px 12px 5px 8px; border-radius: 999px;
  background: var(--md-sys-color-surface-container-low, #fff);
  transition: .15s;
}
.album-back:hover { color: var(--md-sys-color-primary); background: var(--md-sys-color-surface-container-high, #f0f1f6); }
.album-title {
  font-size: 24px; font-weight: 700; margin: 0 0 6px;
  line-height: 1.3; letter-spacing: .2px;
}
.album-desc { margin: 0 0 8px; font-size: 14px; color: var(--md-sys-color-on-surface-variant); }
.album-meta {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12.5px; color: var(--md-sys-color-on-surface-variant);
  padding: 3px 12px; border-radius: 999px;
  background: var(--md-sys-color-surface-container-low, #fff);
}

/* ---------- 工具栏（MD3 segmented） ---------- */
.album-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px; flex-wrap: wrap;
  margin: 16px 0 18px;
}
.seg {
  display: inline-flex; gap: 2px; padding: 3px;
  background: var(--md-sys-color-surface-container-high, #eceef2);
  border-radius: var(--md-sys-shape-corner-full, 999px);
}
.seg-btn {
  display: inline-flex; align-items: center; gap: 5px;
  border: 0; background: transparent; cursor: pointer;
  font-family: inherit; font-size: 13px; color: var(--md-sys-color-on-surface-variant);
  padding: 6px 13px; border-radius: 999px; transition: .18s;
}
.seg-btn i { font-size: 16px; }
.seg-btn:hover { color: var(--md-sys-color-on-surface); }
.seg-btn.is-active {
  background: var(--md-sys-color-surface, #fff);
  color: var(--md-sys-color-primary);
  font-weight: 600;
}

/* ---------- 图片容器：三种布局 ---------- */
.album-mosaic { display: grid; gap: 14px; }
.album-photo { margin: 0; position: relative; }
.album-photo-btn {
  display: block; width: 100%; border: 0; padding: 0; cursor: zoom-in;
  border-radius: var(--md-sys-shape-corner-large, 16px);
  overflow: hidden; background: var(--md-sys-color-surface-container-high, #eceef2);
  position: relative;
}
.album-photo-btn::after {
  content: ""; position: absolute; inset: 0;
  background: rgba(0,0,0,0); transition: background .2s;
}
.album-photo-btn:hover::after { background: rgba(0,0,0,.06); }
.album-photo img {
  display: block; width: 100%; height: 100%; object-fit: cover;
  transition: transform .35s ease;
}
.album-photo:hover img { transform: scale(1.04); }
.album-photo-cap {
  position: absolute; left: 10px; right: 10px; bottom: 8px;
  font-size: 12px; color: #fff; text-align: left;
  background: linear-gradient(transparent, rgba(0,0,0,.55));
  padding: 18px 6px 6px; border-radius: 0 0 16px 16px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  opacity: 0; transition: opacity .2s;
  pointer-events: none;
}
.album-photo:hover .album-photo-cap { opacity: 1; }

/* 网格：等宽 */
.album-mosaic.is-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.album-mosaic.is-grid .album-photo { aspect-ratio: 1; }

/* 瀑布流：CSS columns 错落 */
.album-mosaic.is-masonry {
  display: block;
  column-count: 3; column-gap: 14px;
}
.album-mosaic.is-masonry .album-photo {
  break-inside: avoid; margin: 0 0 14px;
  border-radius: var(--md-sys-shape-corner-large, 16px);
  overflow: hidden; position: relative;
}
.album-mosaic.is-masonry img { height: auto; }

/* 拼图：大小格交错 */
.album-mosaic.is-mosaic {
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 120px;
  grid-auto-flow: dense;
}
.album-mosaic.is-mosaic .album-photo { height: 100%; }
.album-mosaic.is-mosaic .album-photo-btn { height: 100%; }
.album-mosaic.is-mosaic .album-photo:nth-child(6n+1),
.album-mosaic.is-mosaic .album-photo:nth-child(6n+5) {
  grid-column: span 2; grid-row: span 2;
}
.album-mosaic.is-mosaic .album-photo:nth-child(6n+2) { grid-column: span 2; }
.album-mosaic.is-mosaic .album-photo:nth-child(6n+4) { grid-row: span 2; }

/* ---------- 灯箱 ---------- */
.album-lightbox {
  position: fixed; inset: 0; z-index: 3000;
  background: rgba(8, 8, 12, .88);
  backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity .22s ease;
}
.album-lightbox.show { opacity: 1; }
.album-lightbox[hidden] { display: none; }
.lb-stage {
  max-width: 88vw; max-height: 82vh;
  display: flex; align-items: center; justify-content: center;
}
.lb-stage img {
  max-width: 88vw; max-height: 82vh;
  object-fit: contain; border-radius: 12px;
  box-shadow: 0 24px 80px rgba(0,0,0,.5);
  animation: lb-in .25s ease;
}
@keyframes lb-in { from { transform: scale(.94); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.lb-close {
  position: absolute; top: 20px; right: 22px;
  width: 44px; height: 44px; border-radius: 50%;
  border: 0; background: rgba(255,255,255,.12); color: #fff;
  font-size: 24px; cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: .15s;
}
.lb-close:hover { background: rgba(255,255,255,.24); }
.lb-nav {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 48px; height: 48px; border-radius: 50%;
  border: 0; background: rgba(255,255,255,.12); color: #fff;
  font-size: 30px; cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: .15s;
}
.lb-nav:hover { background: rgba(255,255,255,.24); }
.lb-prev { left: 20px; }
.lb-next { right: 20px; }
.lb-meta {
  position: absolute; bottom: 24px; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  color: rgba(255,255,255,.85); font-size: 13px;
  max-width: 80vw; text-align: center;
}
.lb-count { font-size: 12px; color: rgba(255,255,255,.55); letter-spacing: .5px; }
.lb-title { font-size: 14px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1100px) {
  .album-mosaic.is-masonry { column-count: 2; }
}
@media (max-width: 720px) {
  .album-index-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
  .album-index-cover { height: 110px; }
  .album-mosaic.is-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .album-mosaic.is-mosaic { grid-template-columns: repeat(2, 1fr); grid-auto-rows: 100px; }
  .album-mosaic.is-mosaic .album-photo:nth-child(6n+1),
  .album-mosaic.is-mosaic .album-photo:nth-child(6n+5) { grid-column: span 2; grid-row: span 2; }
  .album-mosaic.is-mosaic .album-photo:nth-child(6n+2) { grid-column: span 2; }
  .album-mosaic.is-mosaic .album-photo:nth-child(6n+4) { grid-row: span 2; }
  .album-title { font-size: 20px; }
  .lb-nav { width: 38px; height: 38px; font-size: 24px; }
  .lb-prev { left: 8px; } .lb-next { right: 8px; }
}
@media (max-width: 480px) {
  .album-mosaic.is-masonry { column-count: 2; }
  .album-index-grid { grid-template-columns: repeat(2, 1fr); }
  .album-toolbar { flex-direction: column; align-items: stretch; }
  .seg { justify-content: space-between; }
  .seg-btn { flex: 1; justify-content: center; }
}

/* ---------- 列表布局：图左文右横向卡片 ---------- */
.album-mosaic.is-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.album-mosaic.is-list .album-photo {
  display: flex;
  align-items: stretch;
  background: var(--md-sys-color-surface-container-low, #fff);
  border-radius: var(--md-sys-shape-corner-large, 16px);
  overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease;
}
.album-mosaic.is-list .album-photo:hover {
  transform: translateY(-2px);
}
.album-mosaic.is-list .album-photo-btn {
  flex: none;
  width: 240px;
  aspect-ratio: 3 / 2;
  border-radius: 0;
}
.album-mosaic.is-list .album-photo img { height: 100%; }
.album-mosaic.is-list .album-photo-cap {
  position: static;
  opacity: 1;
  background: none;
  color: var(--md-sys-color-on-surface);
  font-size: 14px;
  font-weight: 600;
  padding: 18px 20px;
  display: flex;
  align-items: center;
  white-space: normal;
  overflow: visible;
  text-overflow: clip;
  line-height: 1.5;
  pointer-events: none;
}

/* ---------- 幻灯片布局：横向滚动一行 ---------- */
.album-mosaic.is-slide {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding: 6px 4px 16px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--md-sys-color-outline-variant, rgba(0,0,0,.15)) transparent;
}
.album-mosaic.is-slide::-webkit-scrollbar { height: 6px; }
.album-mosaic.is-slide::-webkit-scrollbar-thumb {
  background: var(--md-sys-color-outline-variant, rgba(0,0,0,.15));
  border-radius: 999px;
}
.album-mosaic.is-slide::-webkit-scrollbar-track { background: transparent; }
.album-mosaic.is-slide .album-photo {
  flex: none;
  width: 300px;
  height: 340px;
  scroll-snap-align: start;
  border-radius: var(--md-sys-shape-corner-large, 16px);
  overflow: hidden;
  position: relative;
}
.album-mosaic.is-slide .album-photo-btn { height: 100%; border-radius: 0; }
.album-mosaic.is-slide .album-photo img { height: 100%; }
.album-mosaic.is-slide .album-photo-cap {
  position: absolute;
  opacity: 1;
  background: linear-gradient(transparent, rgba(0,0,0,.6));
  color: #fff;
  font-size: 13px;
}

@media (max-width: 720px) {
  .album-mosaic.is-list .album-photo-btn { width: 150px; }
  .album-mosaic.is-slide .album-photo { width: 230px; height: 280px; }
}
@media (max-width: 480px) {
  .album-mosaic.is-list .album-photo { flex-direction: column; }
  .album-mosaic.is-list .album-photo-btn { width: 100%; aspect-ratio: 16 / 10; }
  .album-mosaic.is-list .album-photo-cap { padding: 10px 14px; font-size: 13px; }
}


/* =========================================================
   相册前台 · 精致化增强（MD3 细节打磨 · 无边框无阴影）
   ========================================================= */

/* ---------- 相册列表卡片 ---------- */
.album-index-cover { height: 158px; }
.album-index-cover::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(15,17,25,.28), transparent 45%);
  pointer-events: none;
}
.album-index-cnt {
  top: 10px; bottom: auto; right: 10px;
  background: rgba(18,20,28,.55);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  font-size: 11.5px; font-weight: 500; letter-spacing: .2px;
}
.album-index-info { padding: 15px 17px 17px; }
.album-index-info h3 { font-size: 15.5px; letter-spacing: .1px; }
.album-index-info p { font-size: 12.5px; line-height: 1.55; }
.album-index-more {
  display: inline-flex; align-items: center; gap: 4px;
  margin-top: 12px; padding: 5px 13px 5px 14px;
  border-radius: 999px;
  background: var(--md-sys-color-primary-container, #E0E4FF);
  color: var(--md-sys-color-on-primary-container, #1B2A78);
  font-size: 12px; font-weight: 600;
  transition: .18s;
}
.album-index-more:hover { filter: brightness(.96); gap: 6px; }

/* ---------- 相册详情头部 ---------- */
.album-head { padding: 8px 0 6px; }
.album-back {
  font-size: 12.5px; font-weight: 500;
  padding: 6px 14px 6px 10px; margin-bottom: 16px;
  background: var(--md-sys-color-surface-container-high, #EDEFF4);
  border-radius: 999px;
}
.album-back:hover { transform: translateX(-2px); }
.album-title { font-size: 23px; font-weight: 600; letter-spacing: .2px; line-height: 1.35; }
.album-desc { font-size: 14px; line-height: 1.6; max-width: 560px; }
.album-meta {
  padding: 5px 14px; font-size: 12px; font-weight: 500;
  background: var(--md-sys-color-primary-container, #E0E4FF);
  color: var(--md-sys-color-on-primary-container, #1B2A78);
}

/* ---------- 工具栏 ---------- */
.seg { background: var(--md-sys-color-surface-container-high, #EDEFF4); border-radius: 999px; }
.seg-btn.is-active {
  background: var(--md-sys-color-surface, #fff);
}

/* ---------- 图片卡片 ---------- */
.album-mosaic { gap: 15px; }
.album-photo-btn { border-radius: 15px; }
.album-photo-btn::after { background: linear-gradient(to top, rgba(0,0,0,.22), transparent 42%); opacity: 0; transition: opacity .22s; }
.album-photo-btn:hover::after { opacity: 1; }
.album-photo-cap {
  font-size: 12.5px; font-weight: 500; letter-spacing: .2px;
  background: linear-gradient(transparent, rgba(0,0,0,.62));
  padding: 22px 8px 7px;
}
.album-mosaic.is-masonry .album-photo { border-radius: 15px; }
.album-mosaic.is-grid .album-photo-btn { border-radius: 15px; }

/* ---------- 列表布局增强 ---------- */
.album-mosaic.is-list .album-photo { border-radius: 15px; }
.album-mosaic.is-list .album-photo-cap { padding: 20px 22px; font-size: 14.5px; }
.album-mosaic.is-list .album-photo-cap::after {
  content: '查看大图'; margin-left: auto;
  flex: none; font-size: 12px; font-weight: 600;
  color: var(--md-sys-color-primary, #3D5AFE);
  background: var(--md-sys-color-primary-container, #E0E4FF);
  padding: 5px 14px; border-radius: 999px;
  opacity: 0; transition: .18s;
}
.album-mosaic.is-list .album-photo:hover .album-photo-cap::after { opacity: 1; }

/* ---------- 幻灯片增强 ---------- */
.album-mosaic.is-slide .album-photo { border-radius: 15px; }
.album-mosaic.is-slide .album-photo-btn { border-radius: 0; }

/* ---------- 空状态 ---------- */
.album-empty {
  padding: 80px 16px;
  background: var(--md-sys-color-surface-container-low, rgba(255,255,255,.5));
  border-radius: 20px;
  margin-top: 18px;
}