/* ===== ThirdHub bookshelf.css — 书架页 ===== */
.shelf-tabs {
  display: flex; gap: 4px; padding: 2px 16px 8px;
}
.shelf-tab {
  padding: 8px 18px; border-radius: 999px;
  font-size: 14px; font-weight: 600; color: var(--text-tertiary);
  transition: all .2s;
}
.shelf-tab.on { background: var(--bg-card); color: var(--text-primary); box-shadow: var(--shadow-card); }

.today-card { display: flex; align-items: center; gap: 12px; cursor: pointer; }
.today-card:active { opacity: .85; }

.shelf-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px 12px;
}
@media (min-width: 600px) { .shelf-grid { grid-template-columns: repeat(4, 1fr); } }
@media (min-width: 900px) { .shelf-grid { grid-template-columns: repeat(6, 1fr); } }
.shelf-grid-item { text-align: left; }
.shelf-cover {
  position: relative; aspect-ratio: 3/4; border-radius: 12px;
  background: var(--bg-input); display: grid; place-items: center;
  overflow: hidden; color: var(--text-tertiary);
  box-shadow: 0 3px 10px rgba(0,0,0,.18);
}
.shelf-cover.sm { width: 52px; aspect-ratio: 3/4; border-radius: 8px; flex-shrink: 0; }
.shelf-cover img { width: 100%; height: 100%; object-fit: cover; }
.shelf-cover svg { width: 26px; height: 26px; }
.shelf-top-badge {
  position: absolute; top: 6px; right: 6px;
  background: var(--accent); color: #fff;
  font-size: 10px; font-weight: 700; padding: 1px 6px; border-radius: 6px;
}
.sel-badge {
  position: absolute; top: 6px; left: 6px;
  width: 22px; height: 22px; border-radius: 50%;
  background: rgba(0,0,0,.4); border: 1.5px solid #fff;
  color: #fff; font-size: 13px; display: grid; place-items: center;
}
.sel-badge.inline { position: static; flex-shrink: 0; background: var(--bg-input); border-color: var(--border); color: var(--primary); }
.shelf-item.selected .shelf-cover { outline: 2.5px solid var(--primary); }
.shelf-item.selected .sel-badge { background: var(--primary); }
.shelf-list-item { display: flex; align-items: center; gap: 12px; width: 100%; }
.shelf-edit-bar {
  position: sticky; bottom: 0; z-index: 30;
  display: flex; gap: 8px; padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
  background: var(--bg-page); border-top: 1px solid var(--border);
}