/* ── Reset / base ─────────────────────────────────────────────────────────── */

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

:root {
  --bg:           #1d2021;
  --bg-surface:   #282828;
  --bg-overlay:   #3c3836;
  --border:       #504945;
  --accent:       #d79921;
  --accent-dim:   #b57614;
  --text:         #ebdbb2;
  --text-muted:   #a89984;
  --text-subtle:  #928374;
  --cursor-bg:    #504945;
  --cursor-fg:    #ebdbb2;
  --focused-ring: #d79921;
  --font-mono:    "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;
  --font-ui:      system-ui, -apple-system, "Segoe UI", sans-serif;
  --radius:       4px;
  --tab-h:        32px;
  --cmd-h:        28px;
}

[data-theme="dark"] {
  --bg:           #1d2021;
  --bg-surface:   #282828;
  --bg-overlay:   #3c3836;
  --border:       #504945;
  --accent:       #d79921;
  --accent-dim:   #b57614;
  --text:         #ebdbb2;
  --text-muted:   #a89984;
  --text-subtle:  #928374;
  --cursor-bg:    #504945;
  --cursor-fg:    #ebdbb2;
  --focused-ring: #d79921;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 13px;
  line-height: 1.5;
  overflow: hidden;
}

ul { list-style: none; }

/* ── App shell ────────────────────────────────────────────────────────────── */

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.app-body {
  flex: 1;
  overflow: hidden;
  position: relative;
}

/* ── Tab bar ──────────────────────────────────────────────────────────────── */

.tab-bar {
  display: flex;
  align-items: stretch;
  height: var(--tab-h);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  padding: 0 4px;
  gap: 2px;
  flex-shrink: 0;
}

.tab {
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  white-space: nowrap;
  user-select: none;
  border-radius: var(--radius) var(--radius) 0 0;
  gap: 6px;
}

.tab:hover { color: var(--text); background: var(--bg-overlay); }

.tab.tab-active {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.tab-pdf { cursor: pointer; }

.tab-label { pointer-events: none; }

.tab-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  background: transparent;
  border: none;
  border-radius: 2px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  padding: 0;
  opacity: 0;
  transition: opacity 0.1s, background 0.1s;
}

.tab-pdf:hover .tab-close { opacity: 1; }
.tab-close:hover { background: var(--bg-overlay); color: var(--text); }

/* ── Three-pane library layout ────────────────────────────────────────────── */

.lib-tab {
  display: flex;
  height: 100%;
}

.resizer {
  width: 2px;
  background: var(--border);
  cursor: col-resize;
  flex-shrink: 0;
  transition: background 0.2s;
  z-index: 10;
  position: relative;
}

.resizer::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: -4px;
  right: -4px;
}

.resizer:hover, .resizer.resizing {
  background: var(--accent);
}

.pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.pane-left  { flex-shrink: 0; }
.pane-center { flex: 1; min-width: 0; }
.pane-right  { flex-shrink: 0; }

.pane-focused { outline: 1px solid var(--focused-ring); outline-offset: -1px; }

/* ── Library tree pane ────────────────────────────────────────────────────── */

.tree-pane {
  height: 100%;
  overflow-y: auto;
  padding: 4px 0;
}

.tree-list { padding: 0; }

.tree-item {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px 8px;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border-radius: 0;
}

.tree-item:hover { background: var(--bg-overlay); }

.tree-item.tree-cursor {
  background: var(--cursor-bg);
  color: var(--cursor-fg);
}

.tree-icon {
  color: var(--text-muted);
  font-size: 11px;
  width: 14px;
  flex-shrink: 0;
}

.tree-name {
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Publication list pane ────────────────────────────────────────────────── */

.pub-list-pane {
  height: 100%;
  overflow-y: auto;
}

.pub-list { padding: 4px 0; }

.pub-item {
  display: flex;
  flex-direction: column;
  padding: 6px 10px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  gap: 1px;
}

.pub-item:hover { background: var(--bg-overlay); }

.pub-item.pub-cursor {
  background: var(--cursor-bg);
  color: var(--cursor-fg);
}

.pub-item.pub-cursor .pub-meta { color: var(--text-muted); opacity: 0.8; }
.pub-item.pub-cursor .pub-type { color: var(--accent); }

.pub-type {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  font-weight: 600;
}

.pub-title {
  font-size: 12px;
  font-weight: 500;
  line-height: 1.4;
}

.pub-meta {
  font-size: 11px;
  color: var(--text-muted);
}

/* ── Publication detail pane ──────────────────────────────────────────────── */

.pub-detail-pane {
  height: 100%;
  overflow-y: auto;
  padding: 12px;
}

.detail-title {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 10px;
  color: var(--text);
}

.detail-fields {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 12px;
  align-items: baseline;
}

.detail-fields dt {
  color: var(--text-muted);
  font-size: 11px;
  white-space: nowrap;
  text-align: right;
}

.detail-fields dd {
  color: var(--text);
  font-size: 12px;
  word-break: break-word;
  min-width: 0;
}

.detail-timestamps {
  margin-top: 12px;
  font-size: 10px;
  color: var(--text-subtle);
}

.mono {
  font-family: var(--font-mono);
  font-size: 11px;
}

/* ── Empty state ──────────────────────────────────────────────────────────── */

.empty-state {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-subtle);
  font-size: 12px;
  padding: 24px;
  text-align: center;
}

/* ── Command / search bar ─────────────────────────────────────────────────── */

.command-bar {
  display: flex;
  align-items: center;
  height: var(--cmd-h);
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  padding: 0 8px;
  gap: 4px;
  flex-shrink: 0;
}

.command-prefix {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: bold;
  line-height: 1;
}

.command-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font: inherit;
  font-family: var(--font-mono);
  font-size: 12px;
  caret-color: var(--accent);
}

.command-status {
  color: #fb4934;
  font-size: 12px;
}

/* ── PDF viewer frame ─────────────────────────────────────────────────────── */

.pdf-tab-container {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.pdf-frame {
  flex: 1;
  width: 100%;
  border: none;
  display: block;
  min-height: 0;
}

/* Comment editor — appears at the bottom of the PDF frame when a highlight
   is clicked.  Positioned absolutely so it overlays the iframe. */
.comment-editor {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg1, #3c3836);
  border-top: 1px solid var(--border, #504945);
  padding: 10px 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 10;
}

.comment-editor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--fg2, #a89984);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.comment-close {
  background: none;
  border: none;
  color: var(--fg2, #a89984);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  padding: 0 2px;
}
.comment-close:hover { color: var(--fg, #ebdbb2); }

.comment-textarea {
  width: 100%;
  min-height: 72px;
  resize: vertical;
  background: var(--bg, #282828);
  color: var(--fg, #ebdbb2);
  border: 1px solid var(--border, #504945);
  border-radius: 4px;
  padding: 6px 8px;
  font-family: inherit;
  font-size: 13px;
  line-height: 1.5;
  box-sizing: border-box;
}
.comment-textarea:focus {
  outline: none;
  border-color: var(--yellow, #d79921);
}

.comment-actions {
  display: flex;
  gap: 8px;
}

.comment-save {
  background: var(--yellow, #d79921);
  color: #1d2021;
  border: none;
  border-radius: 4px;
  padding: 4px 14px;
  font-size: 13px;
  cursor: pointer;
  font-weight: 600;
}
.comment-save:hover { filter: brightness(1.1); }

.comment-delete {
  background: none;
  border: 1px solid var(--border, #504945);
  color: var(--fg2, #a89984);
  border-radius: 4px;
  padding: 4px 12px;
  font-size: 13px;
  cursor: pointer;
}
.comment-delete:hover {
  border-color: var(--red, #cc241d);
  color: var(--red, #cc241d);
}

/* ── Drag-and-drop ────────────────────────────────────────────────────────── */

/* Suppress pointer events on text spans inside tree rows so that
   dragleave / dragover never fire on child elements — avoids highlight flicker
   when the cursor moves between the icon and the label inside one row. */
.tree-icon,
.tree-name { pointer-events: none; }

/* Publication items are drag sources. */
.pub-item[draggable="true"] { cursor: grab; }
.pub-item[draggable="true"]:active { cursor: grabbing; }

/* Library tree rows highlighted as drop targets. */
.tree-item.tree-drop-target {
  background: var(--accent-dim);
  color: var(--cursor-fg);
  outline: 1px dashed var(--accent);
  outline-offset: -1px;
}

/* ── Light theme (Gruvbox Light) ─────────────────────────────────────────── */

[data-theme="light"] {
  --bg:           #f9f5d7;
  --bg-surface:   #fbf1c7;
  --bg-overlay:   #ebdbb2;
  --border:       #d5c4a1;
  --accent:       #af3a03;
  --accent-dim:   #d65d0e;
  --text:         #3c3836;
  --text-muted:   #7c6f64;
  --text-subtle:  #928374;
  --cursor-bg:    #d5c4a1;
  --cursor-fg:    #3c3836;
  --focused-ring: #af3a03;
}

/* ── Scrollbar (WebKit) ───────────────────────────────────────────────────── */

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-subtle); }