/* The AI Fieldbook — shared styles for the Daily Briefing and Textbook pages.

   Note on typeface: "Anthropic Sans" is not a redistributable web font, so
   body copy uses a neutral system-sans stack below. Swap `--font-sans` for
   licensed font files if you have them. */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-serif: Georgia, "Iowan Old Style", "Palatino Linotype", "Book Antiqua", serif;

  --color-climatetech-ai: #0f6e56;
  --color-ai-ethics: #7f77dd;
  --color-consumer-ai: #d4537e;
  --color-agentic-ai: #ba7517;

  --color-ink: #1c1c1a;
  --color-ink-soft: #55534d;
  --color-paper: #fdfcfa;
  --color-card: #ffffff;
  --color-border: #e6e3dc;

  --content-width: 640px;
  --body-size: 15px;
  --line-height: 1.75;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: var(--body-size);
  line-height: var(--line-height);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

button {
  font-family: inherit;
  cursor: pointer;
}

.wrap {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px 96px;
}

/* Header */

.site-header {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 48px 24px 24px;
}

.site-title {
  font-size: 26px;
  font-weight: 700;
  margin: 0 0 4px;
  letter-spacing: -0.01em;
}

.site-subtitle {
  color: var(--color-ink-soft);
  margin: 0;
  font-size: 15px;
}

.site-nav {
  display: flex;
  gap: 20px;
  margin-top: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.site-nav a {
  text-decoration: none;
  font-weight: 600;
  color: var(--color-ink-soft);
  padding-bottom: 8px;
}

.site-nav a[aria-current="page"] {
  color: var(--color-ink);
  border-bottom: 2px solid var(--color-ink);
}

/* Toolbar: refresh + drop-a-find */

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 28px 0;
}

.btn {
  border: 1px solid var(--color-border);
  background: var(--color-card);
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
}

.btn:hover {
  border-color: var(--color-ink);
}

.btn-primary {
  background: var(--color-ink);
  color: var(--color-paper);
  border-color: var(--color-ink);
}

.btn-primary:hover {
  opacity: 0.9;
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--color-ink-soft);
}

.btn-ghost:hover {
  color: var(--color-ink);
  border-color: var(--color-border);
}

.drop-find {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 36px;
  background: var(--color-card);
}

.drop-find summary {
  font-weight: 600;
  cursor: pointer;
}

.drop-find form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 14px;
}

.drop-find input[type="text"],
.drop-find textarea,
.drop-find select {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 8px 10px;
  font-family: inherit;
  font-size: 14px;
}

.drop-find textarea {
  resize: vertical;
  min-height: 60px;
}

/* Bucket sections */

.bucket {
  margin-bottom: 48px;
}

.bucket-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.bucket-swatch {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bucket-color);
  flex-shrink: 0;
}

.bucket-title {
  font-size: 18px;
  font-weight: 700;
  margin: 0;
  color: var(--bucket-color);
}

.bucket-count {
  color: var(--color-ink-soft);
  font-size: 13px;
}

.story-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.story-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--bucket-color);
  border-radius: 8px;
  padding: 16px 18px;
}

.story-headline {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
}

.story-headline a {
  color: var(--color-ink);
  text-decoration: none;
}

.story-headline a:hover {
  text-decoration: underline;
}

.story-summary {
  margin: 0 0 10px;
  color: var(--color-ink-soft);
}

.story-meta {
  margin: 0 0 12px;
  font-size: 12.5px;
  color: var(--color-ink-soft);
}

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

.story-actions button {
  border: 1px solid var(--color-border);
  background: transparent;
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-ink-soft);
}

.story-actions button:hover {
  border-color: var(--color-ink);
  color: var(--color-ink);
}

.story-actions button[data-action="save"].is-active {
  background: var(--bucket-color);
  border-color: var(--bucket-color);
  color: #fff;
}

.story-actions button[data-action="interesting"].is-active {
  background: #fff7e0;
  border-color: #e8c76b;
  color: #6b5610;
}

.story-actions button[data-action="skip"].is-active {
  opacity: 0.6;
}

.story-card.is-skipped {
  opacity: 0.5;
}

.story-actions button[data-action="revert"] {
  border-color: transparent;
  background: transparent;
  text-decoration: underline;
  color: var(--color-ink-soft);
}

.story-actions button[data-action="revert"]:hover {
  color: var(--color-ink);
}

.show-more-row {
  margin-top: 14px;
  text-align: center;
}

/* Textbook page */

.chapter {
  margin-bottom: 72px;
}

.chapter-band {
  height: 6px;
  border-radius: 3px;
  background: var(--bucket-color);
  margin-bottom: 18px;
}

.chapter-eyebrow {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--bucket-color);
  margin: 0 0 8px;
}

.chapter-title {
  font-size: 28px;
  font-weight: 700;
  margin: 0 0 10px;
  display: inline-block;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--bucket-color);
}

.chapter-pull-quote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 20px;
  line-height: 1.5;
  color: var(--color-ink);
  border-left: 3px solid var(--bucket-color);
  padding: 4px 0 4px 20px;
  margin: 24px 0 36px;
}

.section-title {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  margin: 32px 0 16px;
}

/* Textbook index page */

.notes-panel {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 18px 20px;
  margin: 28px 0;
  background: var(--color-card);
}

.notes-settings {
  margin-bottom: 14px;
}

.notes-settings summary {
  font-weight: 600;
  cursor: pointer;
}

.notes-settings form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
  max-width: 420px;
}

.notes-settings input[type="text"] {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 8px 10px;
  font-family: inherit;
  font-size: 14px;
}

.notes-help {
  font-size: 12.5px;
  color: var(--color-ink-soft);
  margin: 0;
}

.notes-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.notes-actions .btn input[type="file"] {
  display: none;
}

.notes-status {
  margin: 14px 0 0;
  font-size: 13.5px;
  color: var(--color-ink-soft);
}

.notes-preview {
  margin-top: 18px;
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.preview-group h4 {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  margin: 18px 0 10px;
}

.preview-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
}

.preview-item input[type="checkbox"] {
  margin-top: 4px;
}

.preview-item-body {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 14px;
}

.preview-item-quote {
  color: var(--color-ink-soft);
  font-size: 13px;
}

.preview-item-body select {
  align-self: flex-start;
  font-size: 12.5px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 3px 6px;
}

.preview-item-static {
  font-size: 13.5px;
  color: var(--color-ink-soft);
  padding: 6px 0;
  border-bottom: 1px solid var(--color-border);
}

.preview-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}

.index-heading {
  font-size: 18px;
  margin: 8px 0 16px;
}

.chapter-tiles {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chapter-tile {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--bucket-color);
  border-radius: 8px;
  padding: 16px 18px;
}

.chapter-tile:hover {
  border-color: var(--bucket-color);
}

.chapter-tile-eyebrow {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--bucket-color);
  margin: 0 0 4px;
}

.chapter-tile-title {
  font-size: 18px;
  margin: 0 0 6px;
}

.chapter-tile-meta,
.chapter-tile-counts {
  margin: 0;
  font-size: 13px;
  color: var(--color-ink-soft);
}

.concepts-link {
  margin-top: 20px;
  font-size: 14px;
}

@media (max-width: 480px) {
  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }
}

/* Chapter page */

.chapter-header {
  margin: 8px 0 24px;
}

.chapter-meta {
  margin: 0;
  font-size: 13.5px;
  color: var(--color-ink-soft);
}

/* Concept boxes are emitted inline inside narrative_html by the rewrite
   prompt -- tinted background + dark text from the same color family, never
   white text on the saturated bucket color. */
.concept-box {
  background: var(--bucket-tint, #eee);
  border-radius: 8px;
  padding: 14px 16px;
  margin: 16px 0;
  color: var(--bucket-text-dark, var(--color-ink));
}

.concept-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 6px;
  opacity: 0.85;
}

/* Knowledge graph */

.graph-section {
  margin: 40px 0;
}

.knowledge-graph-svg {
  width: 100%;
  height: auto;
  max-width: 100%;
}

.graph-node-label {
  font-size: 11px;
  fill: var(--color-ink);
  font-family: var(--font-sans);
}

.graph-edge-line {
  stroke: #c9c5ba;
  stroke-width: 1.4;
}

.graph-edge-label-bg {
  fill: var(--color-paper);
  opacity: 0.9;
}

.graph-edge-label {
  font-size: 10px;
  font-style: italic;
  fill: var(--color-ink-soft);
  font-family: var(--font-serif);
}

.graph-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 12px;
  font-size: 12.5px;
  color: var(--color-ink-soft);
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.legend-swatch {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid var(--color-ink-soft);
}

.legend-swatch.legend-ring {
  border-radius: 50%;
  background: none;
}

.legend-swatch.legend-dot {
  border-radius: 50%;
  background: var(--color-ink-soft);
}

.legend-swatch.legend-pill {
  border-radius: 999px;
  width: 20px;
}

.legend-swatch.legend-diamond {
  transform: rotate(45deg);
  width: 11px;
  height: 11px;
}

.legend-swatch.legend-dashed {
  border-style: dashed;
  border-radius: 50%;
  background: none;
}

/* Evidence cards */

.evidence-section {
  margin: 40px 0;
}

.evidence-cards {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.evidence-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid #b9b6ad;
  border-radius: 8px;
  padding: 16px 18px;
}

.evidence-card.evidence-note {
  border-left-color: var(--bucket-color);
}

.evidence-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  margin: 0 0 8px;
}

.evidence-card.evidence-note .evidence-label {
  color: var(--bucket-color);
}

.evidence-title {
  margin: 0 0 6px;
  font-weight: 700;
  font-size: 15px;
}

.evidence-quote {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--color-ink-soft);
}

.evidence-footer {
  margin: 0 0 8px;
  font-size: 12.5px;
  color: var(--color-ink-soft);
}

.evidence-link {
  font-size: 12.5px;
  font-weight: 600;
  text-decoration: none;
  color: var(--bucket-color, var(--color-ink));
}

.evidence-link:hover {
  text-decoration: underline;
}

/* How this chapter grew */

.growth-section {
  margin: 40px 0;
}

.growth-timeline {
  position: relative;
  padding-left: 18px;
  border-left: 2px solid var(--color-border);
}

.timeline-item {
  position: relative;
  padding: 4px 0 16px 16px;
  font-size: 13.5px;
}

.timeline-dot {
  position: absolute;
  left: -23px;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--bucket-color);
}

.timeline-date {
  color: var(--color-ink-soft);
  margin-right: 8px;
}

/* Open threads */

.threads-section {
  margin: 40px 0;
}

.open-threads {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}

.thread-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
}

.thread-queued {
  color: var(--color-ink-soft);
  font-style: italic;
}

/* Footer strip + rewrite controls */

.footer-strip {
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
  margin: 32px 0;
  font-size: 13px;
  color: var(--color-ink-soft);
}

.rewrite-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.rewrite-controls select {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 8px 10px;
  font-family: inherit;
  font-size: 13px;
}

.history-dropdown summary {
  cursor: pointer;
  font-size: 13px;
  color: var(--color-ink-soft);
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 6px 0;
  font-size: 13px;
  border-bottom: 1px solid var(--color-border);
}

/* Concepts index */

.concepts-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 12px;
}

.concept-card {
  background: var(--bucket-tint, var(--color-card));
  border-radius: 8px;
  padding: 16px 18px;
  color: var(--bucket-text-dark, var(--color-ink));
}

.concept-card-title {
  margin: 0 0 6px;
  font-size: 16px;
}

.concept-card-definition {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.6;
}

.concept-card-link {
  font-size: 12.5px;
  font-weight: 600;
  text-decoration: underline;
  color: inherit;
}