:root {
  --bg: #f5f5fa;
  --bg-secondary: #ededf2;
  --bg-card: #fff;
  --text: #000;
  --text-secondary: #747474;
  --text-muted: #bababa;
  --border: rgba(218,218,218,0.5);
  --accent: #2A9D8F;
  --accent-darker: #219789;
  --accent-text: #fff;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-hover: 0 4px 16px rgba(0,0,0,0.12);
  --radius: 10px;
  --transition: 0.25s ease;
  --font-sys: -apple-system, BlinkMacSystemFont, "Segoe UI", "Droid Sans", "Helvetica Neue";
  --font-zh: "PingFang SC", "Hiragino Sans GB", "Droid Sans Fallback", "Microsoft YaHei";
  --font-main: "Lato", var(--font-sys), var(--font-zh), sans-serif;
}

[data-scheme=dark] {
  --bg: #303030;
  --bg-secondary: #3a3a3a;
  --bg-card: #424242;
  --text: rgba(255,255,255,0.9);
  --text-secondary: rgba(255,255,255,0.7);
  --text-muted: rgba(255,255,255,0.5);
  --border: rgba(255,255,255,0.12);
  --accent: #ecf0f1;
  --accent-darker: #bdc3c7;
  --accent-text: #000;
  --shadow: 0 2px 8px rgba(0,0,0,0.25);
  --shadow-hover: 0 4px 16px rgba(0,0,0,0.35);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  font-weight: 400;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
  transition: background-color var(--transition), color var(--transition);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent);
  opacity: 0.8;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Header ===== */
.site-header {
  padding: 48px 0 32px;
  margin-bottom: 32px;
}

.site-header .container {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.site-desc {
  color: var(--text-secondary);
  font-weight: 300;
  font-size: 0.9rem;
  flex: 1;
  text-align: right;
}

/* ===== Theme Toggle ===== */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition);
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.icon-moon { display: none; }
.icon-sun { display: block; }
[data-scheme=dark] .icon-moon { display: block; }
[data-scheme=dark] .icon-sun { display: none; }

/* ===== Album Card (shared by homepage & detail) ===== */
.album-card {
  margin-bottom: 24px;
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: box-shadow var(--transition);
}

.album-card:hover {
  box-shadow: var(--shadow-hover);
}

.album-card-link {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  color: var(--text);
  text-decoration: none;
}

.album-card-link:hover {
  color: var(--text);
  opacity: 1;
}

.album-cover {
  width: 120px;
  height: 67.5px;
  border-radius: 34px;
  overflow: hidden;
  flex-shrink: 0;
}

.album-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.album-info {
  flex: 1;
  min-width: 0;
}

.album-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.album-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

/* ===== Preview Grid ===== */
.album-preview {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  padding: 4px;
}

.album-preview img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 2px;
}

.album-preview-wrap {
  position: relative;
  overflow: hidden;
}

.album-more {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 40px 0 12px;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  background: linear-gradient(to bottom, transparent, var(--bg-card) 60%);
  transition: padding var(--transition);
}

.album-more:hover {
  color: var(--accent-darker, var(--accent));
  opacity: 1;
  padding: 48px 0 12px;
}

/* ===== Album Detail Nav ===== */
.album-detail-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(245, 245, 250, 0.75);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

[data-scheme=dark] .album-detail-nav {
  background: rgba(48, 48, 48, 0.75);
}

.album-detail-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  padding-bottom: 12px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: none;
}

.back-icon {
  flex-shrink: 0;
  vertical-align: middle;
}

.back-link:hover {
  color: var(--accent);
}

/* ===== Album Hero Card (detail page) ===== */
.album-card--hero {
  margin-top: 24px;
  margin-bottom: 24px;
}

.album-card-link--hero {
  cursor: default;
  padding: 32px 24px;
  gap: 16px;
}

.blog-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background-color: #2A9D8F;
  color: #fff;
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.85rem;
  white-space: nowrap;
  transition: opacity var(--transition);
}

.blog-link:hover {
  opacity: 0.85;
  color: #fff;
}

.blog-icon {
  flex-shrink: 0;
  vertical-align: middle;
}

.album-card-link--hero .blog-link {
  margin-left: auto;
}

/* ===== Photo Masonry Grid ===== */
.photo-grid {
  display: flex;
  gap: 12px;
  visibility: hidden;
  height: 0;
  overflow: hidden;
}

.photo-grid.is-ready {
  visibility: visible;
  height: auto;
  overflow: visible;
}

.photo-grid-loader {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 80px 0;
  color: var(--text-muted);
}

.photo-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.photo-item {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-card);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: box-shadow var(--transition), transform var(--transition);
}

.photo-item:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.photo-item img {
  width: 100%;
  display: block;
}

.photo-item figcaption {
  padding: 10px 12px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ===== Footer ===== */
.site-footer {
  margin-top: 48px;
  padding: 24px 0;
  text-align: center;
}

.site-footer .copyright {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.site-footer .copyright a {
  color: var(--text-secondary);
}

/* ===== Image Loading Shimmer ===== */
.img-wrap {
  position: relative;
  overflow: hidden;
  background: var(--shimmer-bg, #e8e8e8);
}

.img-wrap img {
  opacity: 0;
  transition: opacity 0.3s ease;
}

.img-wrap img.is-loaded {
  opacity: 1;
}

.img-wrap::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--shimmer-highlight, rgba(255,255,255,0.4)) 50%,
    transparent 100%
  );
  animation: shimmer 1.5s infinite;
  pointer-events: none;
}

.img-wrap.is-loaded::after {
  display: none;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

[data-scheme=dark] .img-wrap {
  --shimmer-bg: #2a2a2a;
  --shimmer-highlight: rgba(255,255,255,0.08);
}

.album-preview .img-wrap {
  aspect-ratio: 1;
}

.album-cover .img-wrap {
  aspect-ratio: 3 / 2;
}

.photo-item .img-wrap {
  aspect-ratio: auto;
  min-height: 120px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .album-preview {
    grid-template-columns: repeat(4, 1fr);
  }
  
.photo-grid {
    flex-direction: column;
  }

  .photo-col {
    flex: none;
  }
  
  .album-card-link {
    flex-direction: column;
    text-align: center;
    padding: 16px;
  }

  .album-cover {
    width: 160px;
    height: 90px;
    border-radius: 45px;
  }

  .album-meta {
    justify-content: center;
  }

  .site-header .container {
    flex-direction: column;
    text-align: center;
  }

  .site-desc {
    text-align: center;
  }

  .album-card-link--hero {
    flex-direction: column;
    text-align: center;
    padding: 16px;
  }

  .album-card-link--hero .blog-link {
    margin-left: 0;
    align-self: center;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .album-preview {
    grid-template-columns: repeat(6, 1fr);
  }
  
  .photo-grid {
    flex-direction: row;
  }
}

@media (min-width: 1025px) {
  .album-preview {
    grid-template-columns: repeat(8, 1fr);
  }
  
  .photo-grid {
    flex-direction: row;
  }
}
/* ===== Lightbox ===== */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 100;
  background: rgba(0, 0, 0, 0.92);
  display: none;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
}

.lightbox.is-open {
  display: flex;
}

.lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--radius);
  cursor: default;
}

.lightbox-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  border: none;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  line-height: 1;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.25);
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border: none;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-nav:hover {
  background: rgba(255, 255, 255, 0.25);
}

.lightbox-prev {
  left: 16px;
}

.lightbox-next {
  right: 16px;
}

.lightbox-caption {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.85rem;
  max-width: 80vw;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (max-width: 768px) {
  .lightbox img {
    max-width: 95vw;
    max-height: 85vh;
  }
  .lightbox-nav {
    width: 36px;
    height: 36px;
  }
  .lightbox-prev {
    left: 8px;
  }
  .lightbox-next {
    right: 8px;
  }
  .lightbox-caption {
    font-size: 0.8rem;
    bottom: 12px;
  }
}