:root {
  --bg: #0e1116;
  --bg-2: #161b22;
  --bg-3: #1f242c;
  --fg: #e6edf3;
  --fg-dim: #8b949e;
  --accent: #c9482a;
  --accent-2: #f0b429;
  --border: #30363d;
  --link: #58a6ff;
}

* {
  box-sizing: border-box;
}

/* Force the `hidden` attribute to override explicit display rules below. */
[hidden] {
  display: none !important;
}

/* Visually hidden but still focusable + clickable. Used for the file input
   so .click() can programmatically open the OS picker (Safari/Firefox refuse
   on truly display:none inputs). */
.visually-hidden {
  position: fixed;
  left: -9999px;
  top: 0;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 14px;
  overflow: hidden;
}

header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1rem;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  height: 56px;
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--accent-2);
}

#change-book-btn {
  background: var(--bg-3);
  color: var(--fg);
  font-size: 0.8rem;
  padding: 0.35rem 0.7rem;
}

button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.45rem 0.9rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
}

button:hover {
  filter: brightness(1.1);
}

button:disabled {
  opacity: 0.5;
  cursor: default;
}

#status {
  color: var(--fg-dim);
  font-size: 0.85rem;
  flex: 1;
}

#status.error {
  color: #ff6b6b;
}

#search-box input {
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--fg);
  padding: 0.4rem 0.6rem;
  border-radius: 4px;
  font-size: 0.85rem;
  width: 200px;
}

#book-info {
  font-size: 0.85rem;
  color: var(--fg-dim);
  white-space: nowrap;
}

#book-info b {
  color: var(--fg);
}

main {
  display: block;
  height: calc(100vh - 56px);
  transition: padding-right 0.18s ease;
  overflow: hidden;
}

body.has-detail main {
  padding-right: 380px;
}

#left-pane {
  position: relative;
  overflow: hidden;
  background: var(--bg);
  height: 100%;
  display: flex;
  flex-direction: column;
}

#graph-wrapper {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

#graph-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.75rem;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
}

#current-chapter-label {
  color: var(--fg-dim);
}

#current-chapter-label b {
  color: var(--accent-2);
}

#cost-tag {
  color: var(--fg-dim);
  font-size: 0.78rem;
  margin-left: 0.15rem;
  cursor: help;
}

.method-tag {
  display: inline-block;
  background: var(--bg-3);
  color: var(--fg-dim);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.05rem 0.4rem;
  border-radius: 2px;
  margin-left: 0.4rem;
  border: 1px solid var(--border);
}

#back-to-chapters {
  background: var(--bg-3);
  color: var(--fg);
  padding: 0.3rem 0.6rem;
  font-size: 0.8rem;
}


#graph {
  flex: 1;
  width: 100%;
  min-height: 0;
  position: relative;
}

#edge-legend {
  position: absolute;
  bottom: 12px;
  right: 12px;
  background: rgba(22, 27, 34, 0.92);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.55rem 0.7rem;
  font-size: 0.75rem;
  color: var(--fg-dim);
  z-index: 5;
  max-width: 220px;
  /* The container itself shouldn't intercept drags on the graph behind it,
     but each .legend-item enables pointer events so hover-to-highlight works. */
  pointer-events: none;
}

#edge-legend .legend-item:hover {
  background: rgba(240, 180, 41, 0.12);
  color: var(--fg);
  border-radius: 3px;
}

#edge-legend .legend-title {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-dim);
  margin-bottom: 0.4rem;
  font-weight: 600;
}

#edge-legend .legend-item {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.2rem;
  text-transform: capitalize;
  color: var(--fg);
  pointer-events: auto;
  cursor: default;
}

#edge-legend .legend-swatch {
  display: inline-block;
  width: 14px;
  height: 3px;
  border-radius: 1px;
}

#chapter-picker {
  padding: 1.25rem 1.5rem;
  overflow-y: auto;
  flex: 1;
}

#method-section {
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

#method-section h3 {
  margin: 0 0 0.5rem 0;
}

#method-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.method-option {
  display: flex;
  gap: 0.6rem;
  padding: 0.7rem 0.8rem;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.method-option:hover {
  background: var(--bg-3);
}

.method-option input[type="radio"] {
  margin-top: 0.25rem;
  accent-color: var(--accent-2);
  flex-shrink: 0;
}

.method-option:has(input:checked) {
  border-color: var(--accent);
  background: var(--bg-3);
}

.method-title {
  font-size: 0.9rem;
  color: var(--fg);
  font-weight: 500;
  margin-bottom: 0.2rem;
}

.method-badge {
  background: var(--accent-2);
  color: #1a1a1a;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  padding: 0.05rem 0.4rem;
  border-radius: 2px;
  margin-left: 0.4rem;
  letter-spacing: 0.05em;
}

.method-desc {
  font-size: 0.78rem;
  color: var(--fg-dim);
  line-height: 1.4;
}

#full-book-section {
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

#analyze-full-book {
  background: var(--accent-2);
  color: #1a1a1a;
  font-weight: 600;
  padding: 0.7rem 1.2rem;
  font-size: 0.9rem;
  width: 100%;
  text-align: center;
}

#analyze-full-book:hover {
  filter: brightness(1.1);
}

#full-book-note {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--fg-dim);
  line-height: 1.4;
}

#full-book-note.warn {
  color: #f0b429;
}

#chapter-picker h2 {
  margin: 0 0 0.5rem 0;
  font-size: 1rem;
  color: var(--fg);
  font-weight: 600;
}

#chapter-picker h3 {
  margin: 1.25rem 0 0.5rem 0;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-dim);
  font-weight: 600;
}

#chapter-detection-status {
  color: var(--fg-dim);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
}

#chapter-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.chapter-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.6rem 0.8rem;
  cursor: pointer;
}

.chapter-row:hover {
  background: var(--bg-3);
  border-color: var(--accent);
}

.chapter-row.cached {
  border-left: 3px solid var(--accent-2);
}

.chapter-row .ch-title {
  font-size: 0.9rem;
  color: var(--fg);
  flex: 1;
  margin-right: 0.5rem;
}

.chapter-row .ch-pages {
  font-size: 0.75rem;
  color: var(--fg-dim);
  white-space: nowrap;
}

.chapter-row .ch-cached-tag {
  font-size: 0.7rem;
  color: var(--accent-2);
  margin-left: 0.5rem;
}

#manual-range-form {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

#manual-range-form label {
  font-size: 0.85rem;
  color: var(--fg-dim);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

#manual-range-form input {
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--fg);
  padding: 0.3rem 0.5rem;
  border-radius: 3px;
  font-size: 0.85rem;
  width: 70px;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  color: var(--fg-dim);
  font-size: 0.95rem;
  flex: 1;
  min-height: 200px;
  padding: 3rem 1rem 4rem;
  overflow-y: auto;
  gap: 1.5rem;
}

#empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  color: var(--fg-dim);
  font-size: 0.95rem;
  padding: 3rem 1rem 4rem;
  overflow-y: auto;
  gap: 1.5rem;
}

#landing-intro {
  max-width: 480px;
  margin: 0 auto;
  text-align: center;
  align-self: center;
}

#landing-intro p {
  font-size: 0.92rem;
  color: var(--fg-dim);
  line-height: 1.55;
  margin: 0;
}

/* ---- Dropzone (initial upload affordance) ---- */
.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: min(80%, 560px);
  min-height: 300px;
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 3rem 2rem;
  background: var(--bg-2);
  cursor: pointer;
  color: var(--fg-dim);
  text-align: center;
  transition: border-color 0.18s, background 0.18s, color 0.18s, transform 0.18s;
}

.dropzone:hover,
.dropzone.drag-over {
  border-color: var(--accent-2);
  background: var(--bg-3);
  color: var(--fg);
}

.dropzone.drag-over {
  transform: scale(1.01);
}

.dropzone-icon {
  width: 56px;
  height: 56px;
  color: var(--fg-dim);
  margin-bottom: 1rem;
  transition: color 0.18s;
}

.dropzone:hover .dropzone-icon,
.dropzone.drag-over .dropzone-icon {
  color: var(--accent-2);
}

.dropzone-title {
  font-size: 1.15rem;
  color: var(--fg);
  font-weight: 500;
  margin-bottom: 0.35rem;
}

.dropzone-sub {
  font-size: 0.9rem;
  color: var(--fg-dim);
  margin-bottom: 1.25rem;
}

.dropzone-hint {
  font-size: 0.78rem;
  color: var(--fg-dim);
  opacity: 0.7;
}

#example-graph-wrapper {
  width: min(80%, 560px);
}

#example-graph-wrapper:empty {
  display: none;
}

#example-graph-cta {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 0.85rem 1rem;
  text-align: left;
  color: var(--fg);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

#example-graph-cta:hover {
  background: var(--bg-3);
  border-color: var(--accent-2);
}

#example-graph-cta .example-eyebrow {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-dim);
  font-weight: 600;
}

#example-graph-cta .example-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent-2);
}

#example-graph-cta .example-meta {
  font-size: 0.78rem;
  color: var(--fg-dim);
}

#recent-analyses-wrapper {
  width: min(80%, 560px);
}

#recent-analyses-wrapper:empty {
  display: none;
}

#recent-analyses h3 {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-dim);
  font-weight: 600;
  margin: 0 0 0.6rem 0;
}

.recent-book {
  margin-bottom: 0.9rem;
}

.recent-book-name {
  font-size: 0.85rem;
  color: var(--fg);
  font-weight: 500;
  margin-bottom: 0.3rem;
}

.recent-book .recent-meta {
  color: var(--fg-dim);
  font-size: 0.75rem;
  font-weight: 400;
  margin-left: 0.5rem;
}

.recent-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-2);
  border-radius: 4px;
  padding: 0.45rem 0.7rem;
  margin-bottom: 0.3rem;
  font-size: 0.85rem;
  color: var(--fg);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.recent-item:hover {
  background: var(--bg-3);
  border-color: var(--accent);
}

.recent-item .recent-meta {
  color: var(--fg-dim);
  font-size: 0.75rem;
}

/* Fullscreen overlay shown while dragging a file anywhere over the window. */
#drag-overlay {
  position: fixed;
  inset: 0;
  background: rgba(14, 17, 22, 0.88);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  backdrop-filter: blur(2px);
}

.drag-overlay-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  border: 3px dashed var(--accent-2);
  border-radius: 16px;
  padding: 3rem 5rem;
  font-size: 1.4rem;
  color: var(--accent-2);
  font-weight: 600;
  background: var(--bg-2);
}

.drag-overlay-icon {
  width: 64px;
  height: 64px;
  color: var(--accent-2);
}

/* Custom tooltip for citation hover (the floating quote box). */
#quote-tooltip {
  position: fixed;
  z-index: 100;
  max-width: 460px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-2);
  border-radius: 4px;
  padding: 0.7rem 0.9rem;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.5);
  font-size: 0.84rem;
  line-height: 1.5;
  pointer-events: none;
}

#quote-tooltip .qt-page {
  font-size: 0.7rem;
  color: var(--fg-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
}

#quote-tooltip .qt-context {
  color: var(--fg-dim);
}

#quote-tooltip .qt-match {
  color: var(--fg);
  background: rgba(240, 180, 41, 0.12);
  padding: 0.1rem 0;
}

#quote-tooltip .qt-empty {
  color: var(--fg-dim);
  font-style: italic;
}

#detail-panel {
  position: fixed;
  top: 56px;
  right: 0;
  width: 380px;
  max-width: 90vw;
  height: calc(100vh - 56px);
  background: var(--bg-2);
  border-left: 1px solid var(--border);
  padding: 1rem 1.25rem;
  overflow-y: auto;
  box-shadow: -4px 0 16px rgba(0, 0, 0, 0.4);
  z-index: 10;
}

/* Style vis-network's tooltip to match the dark theme. */
.vis-tooltip {
  background: var(--bg-2) !important;
  border: 1px solid var(--border) !important;
  border-left: 3px solid var(--accent-2) !important;
  color: var(--fg) !important;
  border-radius: 4px !important;
  padding: 0.6rem 0.8rem !important;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif !important;
  font-size: 0.85rem !important;
  max-width: 360px !important;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.55) !important;
  line-height: 1.45 !important;
  /* vis-network sets white-space:nowrap by default; force wrapping so long
     descriptions don't run off the screen. */
  white-space: normal !important;
  word-wrap: break-word !important;
  overflow-wrap: break-word !important;
}

.vis-tooltip .nt-name {
  font-size: 0.95rem;
  margin-bottom: 0.3rem;
}
.vis-tooltip .nt-name b {
  color: var(--accent-2);
}

.vis-tooltip .nt-desc {
  color: var(--fg);
  margin-bottom: 0.4rem;
  font-size: 0.82rem;
  line-height: 1.4;
}

.vis-tooltip .nt-facts {
  color: var(--fg-dim);
  font-size: 0.78rem;
  margin-bottom: 0.2rem;
}

.vis-tooltip .nt-life {
  color: var(--fg-dim);
  font-size: 0.78rem;
}

.vis-tooltip .nt-age {
  color: var(--accent-2);
  font-size: 0.82rem;
  margin-top: 0.15rem;
}

.vis-tooltip .nt-networth {
  color: var(--fg);
  font-size: 0.82rem;
  margin-top: 0.15rem;
}

.vis-tooltip .nt-est {
  color: var(--fg-dim);
  font-style: italic;
  font-size: 0.74rem;
}

.vis-tooltip .nt-hint {
  margin-top: 0.4rem;
  color: var(--fg-dim);
  font-size: 0.72rem;
}

.vis-tooltip .et-cat {
  display: inline-block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg-dim);
  background: var(--bg-3);
  padding: 0.05rem 0.4rem;
  border-radius: 2px;
  margin-bottom: 0.4rem;
}

.vis-tooltip .et-pages {
  font-size: 0.75rem;
  color: var(--fg-dim);
  margin-top: 0.3rem;
}

.vis-tooltip i {
  color: var(--fg-dim);
}

#detail-close {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: transparent;
  color: var(--fg-dim);
  font-size: 1.5rem;
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: 4px;
}

#detail-close:hover {
  background: var(--bg-3);
  color: var(--fg);
}

#detail-content h2 {
  margin: 0 0 0.25rem 0;
  font-size: 1.1rem;
  color: var(--accent-2);
}

#detail-content .aliases {
  color: var(--fg-dim);
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}

#detail-content img.thumb {
  width: 100%;
  max-height: 220px;
  object-fit: cover;
  border-radius: 4px;
  margin-bottom: 0.75rem;
}

#detail-content section {
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

#detail-content section:last-child {
  border-bottom: none;
}

#detail-content h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-dim);
  margin: 0 0 0.4rem 0;
  font-weight: 600;
}

#detail-content .fact {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
}

#detail-content .fact > span:not(.label) {
  text-align: right;
}

#detail-content .fact .label {
  color: var(--fg-dim);
}

#detail-content a {
  color: var(--link);
  text-decoration: none;
}

#detail-content a:hover {
  text-decoration: underline;
}

#detail-content .source-tag {
  font-size: 0.7rem;
  color: var(--fg-dim);
  font-style: italic;
}

.cite {
  display: inline-block;
  background: var(--bg-3);
  color: var(--accent-2);
  padding: 0.05rem 0.4rem;
  margin: 0.1rem 0.15rem 0.1rem 0;
  border-radius: 3px;
  font-size: 0.75rem;
  cursor: pointer;
  border: 1px solid var(--border);
}

.cite:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.relationship-card {
  background: var(--bg-3);
  padding: 0.6rem 0.7rem;
  border-radius: 4px;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
  border-left: 3px solid var(--accent);
}

.relationship-card .rel-target {
  font-weight: 600;
  color: var(--fg);
}

.relationship-card .rel-cat {
  display: inline-block;
  font-size: 0.7rem;
  background: var(--bg);
  color: var(--fg-dim);
  padding: 0.05rem 0.4rem;
  border-radius: 3px;
  margin-left: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.relationship-card .rel-desc {
  color: var(--fg);
  margin-top: 0.3rem;
  line-height: 1.4;
}

.pdf-page-highlight {
  background: rgba(240, 180, 41, 0.3) !important;
  transition: background 0.5s ease;
}

/* ---- Loading state ---- */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  width: 100%;
  height: 100%;
  color: var(--fg-dim);
  font-size: 0.95rem;
  text-align: center;
  padding: 2rem;
}

.loading .spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--bg-3);
  border-top-color: var(--accent-2);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.loading .stages {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 0.5rem;
  font-size: 0.85rem;
}

.loading .stage {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--fg-dim);
  opacity: 0.5;
  transition: opacity 0.3s, color 0.3s;
}

.loading .stage.active {
  opacity: 1;
  color: var(--accent-2);
}

.loading .stage.done {
  opacity: 1;
  color: var(--fg-dim);
}

.loading .stage::before {
  content: "○";
  font-size: 0.8rem;
  width: 1rem;
  text-align: center;
}

.loading .stage.active::before {
  content: "●";
  animation: pulse 1.2s ease-in-out infinite;
}

.loading .stage.done::before {
  content: "✓";
  color: #10b981;
}

.loading .timer {
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  color: var(--fg-dim);
  margin-top: 0.25rem;
}

.progress-bar {
  width: 280px;
  height: 6px;
  background: var(--bg-3);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 0.4rem;
}

.progress-bar .fill {
  height: 100%;
  background: var(--accent-2);
  width: 0%;
  transition: width 0.2s ease;
}

.progress-bar.indeterminate .fill {
  width: 40%;
  animation: slide 1.5s ease-in-out infinite;
}

.progress-detail {
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  color: var(--fg-dim);
  margin-top: 0.3rem;
  text-align: center;
}

.progress-eta {
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  color: var(--accent-2);
  margin-top: 0.15rem;
  text-align: center;
  min-height: 1em;
}

@keyframes slide {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(250%);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
}