*, *::before, *::after { box-sizing: border-box; }

:root {
  --md-surface: #0d0d0d;
  --md-surface-container: #141414;
  --md-on-surface: #ddd;
  --md-on-surface-variant: #999;
  --md-on-surface-muted: #555;
  --md-primary: #ff4d4d;
  --md-primary-dark: #cc2929;
  --md-primary-container: rgba(255, 77, 77, 0.12);
  --md-radius-full: 9999px;
  --md-easing-standard: cubic-bezier(0.2, 0, 0, 1);
  --md-duration-short: 0.2s;
}

body {
  margin: 0;
  background: var(--md-surface);
  color: var(--md-on-surface);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* ===== 页面容器 ===== */
.gallery-page {
  padding-bottom: 80px;
}

/* ===== 页面头部 ===== */
.page-header {
  padding: 40px 60px 12px;
}
.back-nav {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--md-on-surface-muted);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.5px;
  transition: color var(--md-duration-short) var(--md-easing-standard);
}
.back-nav:hover { color: var(--md-primary); }
.page-header h1 {
  margin: 0;
  font-family: "Cinzel", serif;
  font-size: 32px;
  color: var(--md-primary-dark);
  letter-spacing: 6px;
  font-weight: 700;
}

/* ===== 筛选器 ===== */
.filter-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  padding: 10px 60px;
  margin-bottom: 40px;
  row-gap: 12px;
}

/* 每一组分类（主标签+胶囊） */
.filter-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 分隔符（竖线） */
.separator {
  width: 1px;
  height: 18px;
  background-color: rgba(255, 255, 255, 0.12);
  margin: 0 24px;
  flex-shrink: 0;
}

/* 主分类（◆ LIVE） */
.main-tag {
  font-size: 14px;
  letter-spacing: 1px;
  color: #666;
  display: flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  transition: color 0.3s;
  font-family: 'Space Grotesk', 'Noto Sans SC', sans-serif;
}
.main-tag:hover { color: #aaa; }
.main-tag.active { color: #fff; font-weight: bold; }

/* 菱形 */
.diamond {
  font-size: 12px;
  color: #333;
  transition: color 0.3s;
}
.main-tag.active .diamond {
  color: #ff4d4d;
}

/* 子标签（胶囊） */
.sub-tag.pill {
  font-size: 12px;
  color: #555;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 3px 12px;
  background: transparent;
  cursor: pointer;
  font-family: 'Space Grotesk', 'Noto Sans SC', sans-serif;
  transition: all 0.3s;
  white-space: nowrap;
}
.sub-tag.pill:hover {
  color: #999;
  border-color: rgba(255, 255, 255, 0.3);
}
.sub-tag.pill.active {
  color: #fff;
  border-color: #666;
  background-color: rgba(255, 255, 255, 0.05);
}

/* ===== 瀑布流 ===== */
.masonry-grid {
  column-count: 4;
  column-gap: 20px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 60px;
}

.masonry-item {
  break-inside: avoid;
  margin-bottom: 20px;
  position: relative;
  cursor: pointer;
  border-radius: 4px;
  background-color: #0a0a0e;
  overflow: hidden;
  min-height: 180px;
  transition: opacity 0.4s ease, transform 0.4s ease;
}
/* 加载前骨架屏脉动 */
.masonry-item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.03) 50%, transparent 100%);
  background-size: 200% 100%;
  animation: skeleton-pulse 1.6s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}
.masonry-item.loaded::before {
  animation: none;
  opacity: 0;
}
@keyframes skeleton-pulse {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.masonry-item.hidden {
  opacity: 0;
  transform: scale(0.92);
  display: none;
}

.masonry-item img {
  width: 100%;
  display: block;
  opacity: 0;
  transition: opacity 0.6s ease;
  position: relative;
  z-index: 1;
}
.masonry-item.loaded img {
  opacity: 0.72;
  filter: grayscale(15%) contrast(1.08);
  transition: opacity 0.6s ease, filter 0.5s ease, transform 0.5s ease;
}

.masonry-item:hover img {
  opacity: 1;
  filter: grayscale(0%) contrast(1);
  transform: scale(1.04);
}

/* 悬浮取景器角标 */
.corner-tl, .corner-br {
  position: absolute;
  width: 0; height: 0;
  border: 1px solid transparent;
  pointer-events: none;
  z-index: 3;
  transition: all 0.4s ease;
}
.corner-tl { top: 10px; left: 10px; }
.corner-br { bottom: 10px; right: 10px; }

.masonry-item:hover .corner-tl {
  width: 14px; height: 14px;
  border-top-color: var(--md-primary);
  border-left-color: var(--md-primary);
}
.masonry-item:hover .corner-br {
  width: 14px; height: 14px;
  border-bottom-color: var(--md-primary);
  border-right-color: var(--md-primary);
}

/* 信息遮罩 */
.item-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0) 100%);
  padding: 28px 18px 14px;
  box-sizing: border-box;
  opacity: 0;
  transform: translateY(8px);
  transition: all 0.4s ease;
  pointer-events: none;
}
.masonry-item:hover .item-overlay {
  opacity: 1;
  transform: translateY(0);
}
.item-date {
  font-family: 'Space Grotesk', monospace;
  font-size: 10px;
  color: var(--md-primary);
  letter-spacing: 2px;
}
.item-desc {
  font-size: 13px;
  color: #fff;
  margin-top: 4px;
  font-weight: 700;
}

/* ===== 灯箱 ===== */
.lightbox {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.92);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.lightbox.active {
  opacity: 1;
  pointer-events: auto;
}
.lightbox-close {
  position: absolute;
  top: 20px;
  right: 28px;
  background: none;
  border: none;
  color: #fff;
  font-size: 36px;
  cursor: pointer;
  z-index: 1001;
  transition: color 0.2s;
  line-height: 1;
}
.lightbox-close:hover { color: var(--md-primary); }
.lightbox-img {
  max-width: 90vw;
  max-height: 75vh;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.6);
}
.lightbox-info {
  margin-top: 20px;
  text-align: center;
}
.lightbox-date {
  font-family: 'Space Grotesk', monospace;
  font-size: 11px;
  color: var(--md-primary);
  letter-spacing: 2px;
}
.lightbox-title {
  font-size: 18px;
  color: #fff;
  margin-top: 6px;
  font-weight: 700;
}
.lightbox-desc {
  font-size: 13px;
  color: var(--md-on-surface-variant);
  margin-top: 4px;
  max-width: 500px;
}

/* ===== 分页 ===== */
.pagination-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 40px 60px 60px;
  flex-wrap: wrap;
}
.pagination-btn {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #666;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 13px;
  letter-spacing: 1px;
  padding: 6px 14px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s;
  min-width: 36px;
  text-align: center;
}
.pagination-btn:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.3);
}
.pagination-btn.active {
  color: #fff;
  border-color: var(--md-primary);
  background: rgba(204, 41, 41, 0.08);
}
.pagination-btn.arrow {
  font-size: 14px;
  padding: 6px 12px;
}
.pagination-info {
  color: #555;
  font-size: 12px;
  font-family: 'Space Grotesk', sans-serif;
  margin: 0 8px;
}
.pagination-dots {
  color: #555;
  font-size: 13px;
  padding: 0 4px;
  letter-spacing: 2px;
}

/* ===== 响应式 ===== */
@media (max-width: 1100px) { .masonry-grid { column-count: 3; } }
@media (max-width: 750px)  {
  .filter-bar { padding: 10px 24px; }
  .main-tag { font-size: 12px; }
  .separator { margin: 0 14px; }
  .masonry-grid { column-count: 2; column-gap: 14px; padding: 0 24px; }
  .page-header { padding: 32px 24px 10px; }
  .pagination-bar { padding: 30px 24px 50px; }
}
@media (max-width: 480px)  {
  .filter-bar { padding: 10px 16px; }
  .separator { margin: 0 10px; }
  .masonry-grid { column-count: 1; padding: 0 16px; }
  .page-header { padding: 28px 16px 8px; }
  .page-header h1 { font-size: 26px; }
  .pagination-bar { padding: 24px 16px 40px; }
  .pagination-btn { font-size: 11px; padding: 4px 10px; min-width: 28px; }
}

/* ===== 返回顶部按钮 ===== */
.page-top-btn {
  position: fixed;
  bottom: 40px;
  right: 40px;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all 0.4s cubic-bezier(0.19, 1, 0.22, 1);
  z-index: 9900;
  background: rgba(5, 5, 7, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-right: 2px solid #cc2929;
  color: #888;
  font-family: "Space Grotesk", "Cinzel", sans-serif;
  font-size: 11px;
  letter-spacing: 2px;
  padding: 10px 20px;
  cursor: pointer;
  border-radius: 4px;
}
.page-top-btn.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.page-top-btn:hover {
  background: rgba(204, 41, 41, 0.15);
  border-color: rgba(204, 41, 41, 0.4);
  color: #fff;
  box-shadow: 0 4px 15px rgba(204, 41, 41, 0.2);
}