/* Knowledge base — "The Archive": global structured entries shared by users
     and agents, presented as category shelves of expandable volume cards
     instead of one flat list. Each shelf/card carries a category accent color
     (--kb-cat-color, set inline per element) that tints its ledge, spine and
     hover glow — the same "colored signal, not just a label" idea used by the
     amber/green/red state overrides documented in CLAUDE.md's Icons section. */
  #knowledge-view { flex: 1; overflow-y: auto; padding: 20px 24px 40px; display: flex; flex-direction: column; gap: 14px; }
  .kb-header h2 { display: flex; align-items: center; gap: 8px; margin: 0; font-family: var(--font-display); letter-spacing: 0.5px; }
  .kb-header h2 .icon-svg { color: var(--accent-2); filter: drop-shadow(0 0 6px rgba(85,124,104,0.5)); }
  .kb-header .sub { font-size: 12.5px; color: var(--text-dim); margin: 4px 0 0; max-width: 72ch; }

  .kb-toolbar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
  #knowledge-add-btn {
    display: inline-flex; align-items: center; gap: 6px;
    border: none; color: #070605; font-weight: 700; flex-shrink: 0;
  }
  .knowledge-controls { display: flex; gap: 8px; flex-wrap: wrap; flex: 1; }
  .knowledge-controls input[type="text"] {
    flex: 1; min-width: 220px;
    background: var(--panel);
    border-radius: 7px; padding: 8px 10px; font-size: 12.5px;
  }
  .knowledge-form-row { display: flex; gap: 8px; flex-wrap: wrap; }

  /* Shelf filter chips — a "browse by shelf" rail standing in for what used
     to be a plain <select>, colored per category so scanning the row itself
     previews the shelf colors below. */
  .kb-shelf-filters { display: flex; gap: 8px; flex-wrap: wrap; }
  .kb-chip {
    display: inline-flex; align-items: center; gap: 6px;
    background: var(--panel); border: 1px solid var(--border); border-radius: 20px;
    padding: 6px 13px; font-size: 12px; font-weight: 600; color: var(--text-dim);
    cursor: pointer; transition: border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
  }
  .kb-chip .icon-svg { width: 13px; height: 13px; }
  .kb-chip:hover { color: var(--text); border-color: var(--kb-cat-color, var(--accent-2)); transform: translateY(-1px); }
  .kb-chip.active {
    color: #070605;
    background: var(--kb-cat-color, var(--accent-2));
    border-color: transparent;
    box-shadow: 0 4px 16px -6px var(--kb-cat-color, rgba(62,90,76,0.6));
  }
  .kb-chip.active .icon-svg { color: #070605; }
  .kb-chip[data-cat=""]:hover { border-color: var(--accent-2); }
  .kb-chip[data-cat=""].active { background: linear-gradient(90deg, var(--accent), var(--accent-2)); box-shadow: 0 4px 16px -6px rgba(62,90,76,0.6); }

  .kb-stat-line {
    font-size: 11.5px; color: var(--text-dim); display: flex; align-items: center; gap: 6px;
  }
  .kb-stat-line .icon-svg { width: 13px; height: 13px; color: var(--accent-2); }
  .kb-stat-line strong { color: var(--text); font-weight: 700; }

  .kb-loading { color: var(--text-dim); font-size: 12px; padding: 8px 0; }
  #knowledge-empty {
    display: flex; align-items: center; gap: 8px;
    color: var(--text-dim); font-size: 13px;
    border: 1px dashed var(--border); border-radius: 10px; padding: 20px; justify-content: center;
  }

  /* Stacks — the vertical run of shelves, each a category grouping. */
  .kb-stacks { display: flex; flex-direction: column; gap: 22px; }
  .kb-shelf { display: flex; flex-direction: column; gap: 10px; }
  .kb-shelf-header {
    display: flex; align-items: center; gap: 8px;
    font-family: var(--font-display); letter-spacing: 0.5px; text-transform: uppercase;
    font-size: 12px; font-weight: 700; color: var(--text);
    position: relative; padding-bottom: 8px;
  }
  .kb-shelf-header .kb-shelf-icon .icon-svg { color: var(--kb-cat-color); filter: drop-shadow(0 0 5px color-mix(in srgb, var(--kb-cat-color) 60%, transparent)); }
  .kb-shelf-count {
    background: var(--panel-2); color: var(--text-dim); border-radius: 20px;
    font-size: 10.5px; font-weight: 700; padding: 1px 8px; letter-spacing: 0;
  }
  /* The "ledge" — a glowing bar under the shelf label standing in for a
     literal wooden shelf edge, colored per category so each stack of cards
     reads as sitting on its own distinct shelf. */
  .kb-shelf-ledge {
    position: absolute; left: 0; right: 0; bottom: 0; height: 2px;
    background: linear-gradient(90deg, var(--kb-cat-color), transparent 85%);
    box-shadow: 0 0 8px -1px var(--kb-cat-color);
  }
  .kb-shelf-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px;
  }

  /* Volume card — an index-card / book-spine hybrid: a colored spine on the
     left edge, a corner "new" ribbon, hover-revealed edit/delete, and a
     click-to-expand body so a shelf can hold a lot of entries without every
     one of them being fully unfurled at once. */
  .kb-card {
    position: relative;
    background: var(--panel);
    border: 1px solid var(--border);
    border-left: 3px solid var(--kb-cat-color);
    border-radius: 10px;
    padding: 12px 14px 10px;
    cursor: pointer;
    transition: border-color 0.15s ease, box-shadow 0.2s ease, transform 0.15s ease;
  }
  .kb-card.no-clamp { cursor: default; }
  .kb-card:hover {
    border-color: color-mix(in srgb, var(--kb-cat-color) 55%, var(--border));
    box-shadow: 0 8px 24px -12px var(--kb-cat-color);
    transform: translateY(-2px);
  }
  .kb-card.expanded { box-shadow: 0 8px 28px -14px var(--kb-cat-color); }

  .kb-new-ribbon {
    position: absolute; top: -8px; left: 10px;
    display: inline-flex; align-items: center; gap: 3px;
    background: linear-gradient(120deg, var(--accent), var(--accent-2) 55%, #E4DDCE);
    color: #070605; font-size: 9.5px; font-weight: 800; text-transform: uppercase; letter-spacing: 0.4px;
    border-radius: 20px; padding: 2px 8px;
    box-shadow: 0 3px 10px -3px rgba(62,90,76,0.7);
  }
  .kb-new-ribbon .icon-svg { width: 9px; height: 9px; color: #070605; }

  .kb-card-actions {
    position: absolute; top: 8px; right: 8px;
    display: flex; gap: 2px;
    opacity: 0; transition: opacity 0.15s ease;
  }
  .kb-card:hover .kb-card-actions, .kb-card:focus-within .kb-card-actions { opacity: 1; }
  .kb-card-actions .edit, .kb-card-actions .del {
    display: inline-flex; color: var(--text-dim); font-size: 13px; cursor: pointer;
    padding: 3px 5px; border-radius: 5px;
  }
  .kb-card-actions .edit:hover { color: var(--text); background: rgba(255,255,255,0.06); }
  .kb-card-actions .del:hover { color: var(--red); background: rgba(255,107,107,0.12); }
  .kb-card-actions .icon-svg { width: 13px; height: 13px; }

  .kb-card-top { display: flex; align-items: flex-start; gap: 8px; margin: 4px 26px 6px 0; flex-wrap: wrap; }
  .kb-title { font-size: 13.5px; font-weight: 700; font-family: var(--font-display); letter-spacing: 0.2px; line-height: 1.3; }

  .kb-excerpt { font-size: 13px; white-space: pre-wrap; word-break: break-word; color: var(--text); }
  .kb-card:not(.no-clamp):not(.expanded) .kb-excerpt {
    display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden;
  }

  .kb-expand-hint {
    display: flex; align-items: center; gap: 4px; margin-top: 6px;
    font-size: 10.5px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.4px;
    color: var(--kb-cat-color);
  }
  .kb-expand-hint .icon-svg { width: 10px; height: 10px; transition: transform 0.2s ease; }
  .kb-expand-hint .hint-less { display: none; }
  .kb-card.expanded .kb-expand-hint .hint-more { display: none; }
  .kb-card.expanded .kb-expand-hint .hint-less { display: inline-flex; align-items: center; gap: 4px; }
  .kb-card.expanded .kb-expand-hint .icon-svg { transform: rotate(180deg); }

  .kb-card-footer { font-size: 10.5px; color: var(--text-dim); margin-top: 8px; opacity: 0.85; display: flex; gap: 10px; flex-wrap: wrap; }

  .knowledge-badge {
    font-size: 10px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.3px;
    border-radius: 5px; padding: 2px 7px; display: inline-flex; align-items: center; gap: 4px;
    background: var(--panel-2); color: var(--text-dim); border: 1px solid var(--border);
  }
  .knowledge-badge .icon-svg { width: 0.9em; height: 0.9em; }
  .knowledge-area-badge.knowledge-area-user { color: var(--amber); border-color: rgba(255,176,32,0.4); }
  .knowledge-area-badge.knowledge-area-user .icon-svg { color: var(--amber); }
  .knowledge-area-badge.knowledge-area-agent { color: var(--accent-2); border-color: rgba(228,221,206,0.35); }
  .knowledge-area-badge.knowledge-area-agent .icon-svg { color: var(--accent-2); }
  .knowledge-project-badge {
    background: var(--panel-2); border-radius: 5px; padding: 1px 7px; font-size: 10.5px; color: var(--text-dim);
  }
  .knowledge-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
  .knowledge-tag {
    font-size: 10.5px; color: var(--text-dim); background: var(--panel-2);
    border-radius: 5px; padding: 1px 7px; border: 1px solid var(--border);
  }

  @media (max-width: 640px) {
    .kb-shelf-grid { grid-template-columns: 1fr; }
    .kb-toolbar { flex-direction: column; align-items: stretch; }
  }