/* ════════════════════════════════════════════════════════════════════
   Library  (left sidebar) — accordion style
   ════════════════════════════════════════════════════════════════════ */

#library {
  display: flex;
  flex-direction: column;
  /* Liquid glass (DESIGN.md §6.4/§8.4) — same tokens as floating panels. */
  background: var(--float-bg);
  backdrop-filter: blur(var(--float-blur)) saturate(var(--float-sat));
  -webkit-backdrop-filter: blur(var(--float-blur)) saturate(var(--float-sat));
  border-right: 1px solid var(--line);
  box-shadow: var(--float-edge);
  overflow: hidden;
}

.lib-header {
  /* Unified dock toolbar (2026-06-15 redesign)：[‹back] [breadcrumb …] [filter][drag]
     —— 单条工具条吃掉删标题腾出的整行；**无 border-bottom 分割线**（user 定）。 */
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 5px 6px 5px 7px;
  min-height: 34px;
}

/* Toolbar back button — ghost icon, hidden at root (renderCrumbBar). */
.lib-back {
  flex: 0 0 auto;
  appearance: none;
  background: transparent;   /* user 2026-07-04：撤回静止淡底座（难看背景阴影），hover 再 fill */
  border: none;
  border-radius: 5px;
  width: 26px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-2);
  cursor: pointer;
  transition: background-color var(--dur-micro) var(--ease-out),
              color var(--dur-micro) var(--ease-out);
}
.lib-back:hover { background: var(--overlay-1); color: var(--ink-1); }
.lib-back:active { background: var(--overlay-2); }
.lib-back:focus-visible { outline: none; box-shadow: 0 0 0 2px var(--overlay-2); }
.lib-back[hidden] { display: none; }

/* ── filter / draggable-only icon 钮（工具条右端）。 */
.lib-header-controls {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;   /* push to the right edge; breadcrumb takes the middle */
}
.lib-header-btn {
  position: relative;
  appearance: none;
  background: transparent;   /* user 2026-07-04：撤回静止淡底座（难看背景阴影），hover 再 fill */
  border: 1px solid transparent;
  border-radius: 5px;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-2);
  cursor: pointer;
  transition:
    background-color var(--dur-micro) var(--ease-out),
    color var(--dur-micro) var(--ease-out);
}
.lib-header-btn:hover { background: var(--overlay-1); color: var(--ink-1); }
.lib-header-btn:active { background: var(--overlay-2); }
.lib-header-btn.is-active { background: var(--overlay-2); color: var(--ink-1); }
.lib-header-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--overlay-2);
}
.lib-header-btn[hidden] { display: none; }
.lib-header-btn-badge {
  position: absolute;
  top: 1px;
  right: 1px;
  min-width: 13px;
  height: 13px;
  padding: 0 3px;
  border-radius: 999px;
  background: var(--ink-1);
  color: var(--surface);
  font: 600 9px/13px var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: center;
}
.lib-header-btn-badge[hidden] { display: none; }

/* .lib-title removed (2026-06-15 subtraction)：dock 不再设标题，breadcrumb（§8.5）
   成为列表区顶部唯一文字锚点。 */

.lib-scroll {
  flex: 1 1 auto;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 8px 12px 8px;
  min-height: 0;
}

/* ═══ L1 — top-level taxonomy section (Light Sources, Optics, ...) ═══ */
.lib-l1 {
  margin-top: 8px;
}
.lib-l1:first-child { margin-top: 4px; }

.lib-l1-header {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 4px;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  color: var(--ink);
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
  outline: none;
}

.lib-l1-header:hover {
  background: var(--surface-2);
  border-color: var(--ink-1);
}

.lib-l1-header:focus-visible {
  border-color: var(--ink-1);
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.18);
}

.lib-chevron {
  display: inline-block;
  width: 12px;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-1);
  transition: transform 0.22s cubic-bezier(0.22, 0.61, 0.36, 1);
  line-height: 1;
}

.lib-l1[data-collapsed="false"] > .lib-l1-header > .lib-chevron,
.lib-l2[data-collapsed="false"] > .lib-l2-header > .lib-chevron {
  transform: rotate(90deg);
}

.lib-l1-title {
  flex: 1;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.lib-count {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  color: var(--ink-3);
  background: var(--paper-deep);
  border-radius: 10px;
  padding: 2px 9px;
  letter-spacing: 0.02em;
}

.lib-l1-header:hover .lib-count {
  background: var(--surface-3);
  color: var(--ink-1);
}

.lib-l1-body {
  max-height: 2000px;
  overflow: hidden;
  transition: max-height 0.32s cubic-bezier(0.22, 0.61, 0.36, 1),
              opacity 0.2s, padding 0.18s;
  padding: 6px 4px 2px 8px;
}

.lib-l1[data-collapsed="true"] > .lib-l1-body {
  max-height: 0;
  opacity: 0;
  padding-top: 0;
  padding-bottom: 0;
}

/* ═══ L2 — sub-category (CW Pulsed Lasers, Mirrors, ...) ═══ */
.lib-l2 {
  margin-top: 6px;
  border-left: 1px dashed var(--line);
  padding-left: 10px;
}

.lib-l2-header {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 10px;
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  color: var(--ink-2);
  border-radius: 3px;
  transition: background 0.12s, color 0.12s;
  outline: none;
}

.lib-l2-header:hover {
  background: var(--surface-2);
  color: var(--ink-1);
}

.lib-l2-title {
  flex: 1;
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.lib-count-sm {
  font-size: 9.5px;
  padding: 1px 7px;
}

.lib-l2-body {
  max-height: 1500px;
  overflow: hidden;
  transition: max-height 0.28s cubic-bezier(0.22, 0.61, 0.36, 1),
              opacity 0.18s, padding 0.18s;
  padding: 2px 0 0 4px;
}

.lib-l2[data-collapsed="true"] > .lib-l2-body {
  max-height: 0;
  opacity: 0;
  padding-top: 0;
}

/* ═══ L3 — leaf group (DPSS Series, Laser Line Mirrors, Handheld...) ═══ */
.lib-l3 {
  margin: 6px 0 10px;
}

.lib-l3-header {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 4px 4px 6px;
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.lib-l3-dot {
  width: 4px;
  height: 1px;
  background: var(--line-2);
  flex: 0 0 4px;
}

.lib-l3-title {
  flex: 1;
}

.lib-cards {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.lib-card {
  display: grid;
  grid-template-columns: 30px 1fr auto;
  grid-template-rows: auto auto;
  column-gap: 10px;
  align-items: center;
  padding: 10px 12px 9px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 4px;
  cursor: grab;
  transition: all 0.12s;
  position: relative;
}

.lib-card:hover {
  border-color: var(--ink-1);
  background: var(--surface-2);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05),
              0 4px 12px -4px rgba(0, 0, 0, 0.18);
  transform: translateY(-1px);
}

.lib-card:active,
.lib-card.dragging {
  cursor: grabbing;
}

.lib-card .swatch {
  grid-row: 1 / span 2;
  grid-column: 1;
  width: 24px;
  height: 24px;
  border-radius: 4px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  position: relative;
}

.lib-card .swatch.wl {
  background: var(--swatch-color, #888);
  box-shadow: inset 0 -6px 8px rgba(0, 0, 0, 0.18),
              inset 0 4px 8px rgba(255, 255, 255, 0.3);
}

.lib-card .swatch.mirror::before {
  content: '';
  position: absolute;
  inset: 4px;
  background: linear-gradient(135deg, #f0f0f0 0%, #d4d4d4 100%);
  border-radius: 50%;
  box-shadow: inset 1px 1px 1px rgba(255, 255, 255, 0.6);
}

.lib-card .swatch.mirror::after {
  content: '';
  position: absolute;
  left: 4px;
  right: 4px;
  top: 50%;
  height: 1px;
  background: var(--swatch-color, var(--ink-1));
  transform: rotate(-30deg);
  transform-origin: center;
}

.lib-card .swatch.pm {
  background: linear-gradient(180deg, #fafafa 0%, #d4d4d4 100%);
}

.lib-card .swatch.pm::after {
  content: '';
  position: absolute;
  inset: 5px;
  background: #1a1a1c;
  border-radius: 50%;
  box-shadow: inset 0 0 4px rgba(255, 200, 100, 0.3);
}

.lib-card .lib-card-name {
  grid-row: 1;
  grid-column: 2;
  font-size: 12px;
  font-weight: 500;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.2;
}

.lib-card .lib-card-sku {
  grid-row: 2;
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
  margin-top: 1px;
}

.lib-card .lib-card-spec {
  grid-row: 1 / span 2;
  grid-column: 3;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-1);
  font-weight: 500;
  text-align: right;
  letter-spacing: 0.02em;
}

.lib-card .lib-card-spec .unit {
  color: var(--ink-3);
  font-weight: 400;
  margin-left: 1px;
}

/* breadboard group styling — body holds select + info */
.lib-group-bb .lib-group-body {
  padding: 10px 4px 6px;
}

.bb-select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 12px;
  cursor: pointer;
  outline: none;
  transition: all 0.12s;
}

.bb-select:hover { border-color: var(--ink-1); }
.bb-select:focus {
  border-color: var(--ink-1);
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.13);
}

.bb-info {
  margin-top: 8px;
  padding: 8px 10px;
  background: var(--surface-2);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-2);
  letter-spacing: 0.02em;
  line-height: 1.7;
}

.bb-info .bb-info-key {
  color: var(--ink-3);
  margin-right: 6px;
}