:root {
  --bg: #0b0d10;
  --card: #111419;
  --text: #eaeef4;
  --muted: #97a0ab;
  --accent: #6aa5ff;
  --tag: #1b222c;
  --tag-text: #cfe1ff;
  --shadow: 0 10px 30px rgba(0,0,0,.25);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font: 14px/1.5 system-ui, -apple-system, Segoe UI, Roboto, PingFang SC,
        Hiragino Sans GB, "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
}

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

.site-header {
  max-width: 1200px;
  margin: 24px auto 8px;
  padding: 0 16px;
}
.site-header h1 {
  margin: 0 0 4px;
  font-weight: 800;
  letter-spacing: .2px;
}
.muted { color: var(--muted); margin: 0 0 16px; }

.search {
  width: 100%;
  height: 44px;
  padding: 0 14px;
  border-radius: 10px;
  background: #0f1318;
  color: var(--text);
  border: 1px solid #1b232c;
  outline: none;
}
.search:focus { border-color: #2a3a4d; }

.grid {
  max-width: 1200px;
  margin: 14px auto 80px;
  padding: 0 16px 16px;
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 14px;
}
@media (min-width: 640px) { .grid { grid-template-columns: repeat(2, 1fr);} }
@media (min-width: 980px) { .grid { grid-template-columns: repeat(3, 1fr);} }
@media (min-width: 1300px){ .grid { grid-template-columns: repeat(4, 1fr);} }

.card {
  background: var(--card);
  border: 1px solid #1b232c;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform .15s ease, border-color .15s ease;
  cursor: pointer;
}
.card:hover { transform: translateY(-2px); border-color: #273344; }

.card .thumb {
  width: 100%;
  height: 220px;
  display: block;
  object-fit: cover;
  background:
    conic-gradient(from 180deg at 50% 50%, #191f27, #12161c 50%, #191f27),
    #0f1318;
}
.card .body {
  padding: 12px;
}
.card h3 { margin: 0 0 10px; }
.tags { display: flex; gap: 6px; flex-wrap: wrap; }
.tag {
  background: var(--tag);
  color: var(--tag-text);
  border: 1px solid #223043;
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 12px;
}

/* --- Viewer modal --- */
#viewer {
  position: fixed;
  inset: 0;
  display: none;           /* 默认隐藏 */
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,.7);
  z-index: 9999;
}
#viewer.is-open { display: flex; }
#viewer .sheet {
  position: relative;
  width: min(1100px, 92vw);
  max-height: 90vh;
  background: #111419;
  padding: 16px;
  border-radius: 12px;
  overflow: auto;
  border: 1px solid #1b232c;
  box-shadow: var(--shadow);
}
#viewer .cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
#viewer figure { margin: 0; }
#viewer img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  background: #0f1318;
  border-radius: 8px;
}
#viewer figcaption {
  margin-top: 6px;
  color: var(--muted);
}
#viewer .close-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  font-size: 20px;
  background: transparent;
  border: 0;
  color: #fff;
  cursor: pointer;
  width: 36px; height: 36px; line-height: 36px;
  border-radius: 8px;
}
#viewer .close-btn:hover { background: rgba(255,255,255,.08); }