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

:root {
  --bg: #0d0d0d;
  --surface: #1a1a1a;
  --border: #2a2a2a;
  --text: #e8e8e8;
  --muted: #888;
  --accent: #c8ff00;
  --radius: 8px;
  --gap: 16px;
}

html { background: var(--bg); color: var(--text); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; font-size: 14px; }
body { min-height: 100vh; }
a { text-decoration: none; color: inherit; }
img { display: block; width: 100%; height: 100%; object-fit: cover; }

/* ─── Loading ─── */
.loading { display: flex; align-items: center; justify-content: center; height: 100vh; color: var(--muted); font-size: 16px; }

/* ─── Header ─── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg); border-bottom: 1px solid var(--border);
  padding: 14px 24px;
  display: flex; align-items: center; gap: 16px;
}
.site-title { font-size: 16px; font-weight: 600; flex: 1; }
.site-meta { color: var(--muted); font-size: 12px; white-space: nowrap; }
.back-btn {
  color: var(--accent); font-size: 13px; font-weight: 500;
  white-space: nowrap;
  transition: opacity .15s;
}
.back-btn:hover { opacity: .7; }

/* ─── Home: group sections ─── */
.home-grid { padding: 24px; display: flex; flex-direction: column; gap: 36px; }

.group-title {
  font-size: 11px; font-weight: 700; letter-spacing: .1em;
  text-transform: uppercase; color: var(--muted);
  margin-bottom: 12px;
}

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

.cat-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: border-color .15s, transform .15s;
  cursor: pointer;
}
.cat-card:hover { border-color: var(--accent); transform: translateY(-2px); }

.cat-cover-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 80px 80px;
  background: #111;
}
.cat-cover-grid img { width: 100%; height: 100%; object-fit: cover; }
.cat-cover-grid:has(img:only-child) { grid-template-columns: 1fr; grid-template-rows: 160px; }
.no-cover { background: #1a1a1a; grid-column: 1 / -1; grid-row: 1 / -1; }

.cat-info {
  padding: 10px 12px;
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
}
.cat-name { font-size: 13px; font-weight: 500; flex: 1; }
.cat-count { font-size: 11px; color: var(--muted); }

/* ─── Batch bar ─── */
.batch-bar {
  display: flex; gap: 8px; flex-wrap: wrap;
  padding: 12px 24px; border-bottom: 1px solid var(--border);
  position: sticky; top: 49px; z-index: 90;
  background: var(--bg);
}
.batch-btn {
  padding: 5px 12px; font-size: 12px; font-weight: 500;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 20px; color: var(--muted); cursor: pointer;
  transition: all .15s;
}
.batch-btn:hover { border-color: var(--text); color: var(--text); }
.batch-btn.active { background: var(--accent); border-color: var(--accent); color: #000; }

/* ─── Album grid ─── */
.album-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--gap);
  padding: 24px;
}

.album-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: border-color .15s, transform .15s;
  cursor: pointer;
}
.album-card:hover { border-color: var(--accent); transform: translateY(-2px); }

.album-img-wrap { aspect-ratio: 1; background: #111; overflow: hidden; }
.album-img-wrap img { width: 100%; height: 100%; object-fit: cover; transition: transform .2s; }
.album-card:hover .album-img-wrap img { transform: scale(1.04); }

.album-info { padding: 10px 12px; display: flex; flex-direction: column; gap: 4px; }
.album-sub { font-size: 10px; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.album-name { font-size: 12px; font-weight: 500; line-height: 1.4; }
.album-batch {
  display: inline-block; font-size: 10px; font-weight: 700;
  color: var(--accent); letter-spacing: .05em;
}
.album-price { font-size: 11px; color: var(--muted); font-family: 'SF Mono', 'Menlo', monospace; margin-top: 2px; }

/* ─── Album detail ─── */
.album-detail { max-width: 900px; margin: 0 auto; padding: 24px; }

.detail-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.tag {
  padding: 4px 10px; font-size: 11px; font-weight: 500;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 4px; color: var(--muted);
}

.detail-price {
  font-size: 15px; color: var(--muted); margin-bottom: 24px;
}
.detail-price strong { color: var(--accent); font-family: 'SF Mono', 'Menlo', monospace; font-size: 18px; }

.detail-photos {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--gap);
}
.detail-photo { border-radius: var(--radius); overflow: hidden; background: #111; aspect-ratio: 1; }
.detail-photo img { width: 100%; height: 100%; object-fit: cover; }

/* ─── Responsive ─── */
@media (max-width: 600px) {
  .home-grid, .album-grid, .album-detail { padding: 16px; }
  .batch-bar { padding: 10px 16px; }
  .site-header { padding: 12px 16px; }
  .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .album-grid { grid-template-columns: repeat(2, 1fr); }
  .detail-photos { grid-template-columns: 1fr 1fr; }
}