/* ============================================
   IA COURSE: SHARED STYLES
   Token system confirmed in design plan
   ============================================ */

/* --- Self-hosted fonts (latin subsets; see assets/fonts/SOURCES.txt) --- */
@import url('../fonts/fonts.css');

/* --- Tokens --- */
:root {
  --ground:    #F7F5F0;
  --ink:       #1A1A18;
  --structure: #2D5BE3;
  --trace:     #E8E4DC;
  --found:     #1A7A5E;

  /* Muted ink steps replace opacity-based dimming so secondary text keeps a
     real contrast ratio. Measured against both --ground and white:
     --ink-muted  6.9:1 / 7.6:1   --ink-subtle  4.9:1 / 5.3:1
     Both clear the WCAG AA 4.5:1 minimum for body text. */
  --ink-muted:  #57544D;
  --ink-subtle: #706B61;

  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body:    'Inter', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --text-display: 2rem;
  --text-title:   1.25rem;
  --text-body:    1rem;
  --text-small:   0.875rem;
  --text-label:   0.75rem;

  --max-width: 680px;
  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  1.75rem;
  --space-lg:  3rem;
  --space-xl:  4.5rem;

  --radius: 4px;
  --transition-reveal: 0.35s ease;
}

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

/* --- Base --- */
/* No font-size here on purpose: the type scale is in rem, so the root must
   stay at the browser default for user text-size preferences to apply. */
html {
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--ground);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.7;
  min-height: 100vh;
}

/* --- Layout container --- */
.course-wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-sm);
}

/* Index and library pages are directories, not prose. The 680px reading
   measure is right for a lesson and too narrow for a grid of cards, so those
   pages opt into a wider shell and constrain their own text blocks instead. */
.course-wrap--wide {
  max-width: 1040px;
}

/* ============================================
   MINI-NAV
   ============================================ */
.mini-nav {
  padding: var(--space-md) 0 var(--space-sm);
  border-bottom: 1px solid var(--trace);
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.mini-nav__breadcrumb {
  font-size: var(--text-small);
  color: var(--ink-muted);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.mini-nav__breadcrumb a {
  color: var(--structure);
  text-decoration: none;
  font-size: var(--text-small);
}

.mini-nav__breadcrumb a:hover {
  text-decoration: underline;
}

.mini-nav__breadcrumb span {
  color: var(--ink-subtle);
}

.mini-nav__position {
  font-size: var(--text-small);
  color: var(--ink-subtle);
}

.mini-nav__links {
  display: flex;
  gap: var(--space-md);
  width: 100%;
  margin-top: var(--space-xs);
}

.mini-nav__links a {
  font-size: var(--text-small);
  color: var(--structure);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.mini-nav__links a:hover {
  text-decoration: underline;
}

.mini-nav__links .spacer {
  flex: 1;
}

/* ============================================
   CONCEPT ZONE
   ============================================ */
.concept {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--trace);
}

.concept__headline {
  font-family: var(--font-display);
  font-size: var(--text-display);
  font-weight: 400;
  line-height: 1.25;
  color: var(--ink);
  margin-bottom: var(--space-md);
}

.concept__body {
  font-size: var(--text-body);
  line-height: 1.75;
  color: var(--ink);
}

.concept__body p + p {
  margin-top: var(--space-sm);
}

.concept__anchor {
  margin-top: var(--space-md);
  padding-left: var(--space-md);
  border-left: 2px solid var(--trace);
  font-size: var(--text-body);
  color: var(--ink-muted);
  font-style: italic;
  line-height: 1.6;
}

/* ============================================
   EXERCISE ZONE
   ============================================ */
.exercise {
  margin-bottom: var(--space-lg);
}

.exercise__zone-label {
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--structure);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.exercise__zone-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--trace);
}

.exercise__scenario {
  font-size: var(--text-body);
  line-height: 1.75;
  margin-bottom: var(--space-md);
}

.exercise__scenario p + p {
  margin-top: var(--space-sm);
}

.exercise__scenario strong {
  font-weight: 600;
}

/* --- Question fieldset (for multi-question exercises) --- */
.exercise__question {
  border: none;
  padding: 0;
  margin: 0 0 var(--space-md) 0;
}

.exercise__question-prompt {
  font-size: var(--text-body);
  line-height: 1.65;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 0.75rem;
  padding: 0;
}

/* --- Options (radio / checkbox) --- */
.exercise__options {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.exercise__option {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--trace);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
  background: white;
}

.exercise__option:hover {
  border-color: var(--structure);
}

.exercise__option input[type="radio"],
.exercise__option input[type="checkbox"] {
  margin-top: 0.2rem;
  accent-color: var(--structure);
  flex-shrink: 0;
  width: 1rem;
  height: 1rem;
  cursor: pointer;
}

/* :has() keeps the tile highlighted even if JS has not mirrored the checked
   state into .is-selected yet (or at all). */
.exercise__option.is-selected,
.exercise__option:has(input:checked) {
  border-color: var(--structure);
  background: #F0F4FF;
}

.exercise__option-text {
  font-size: var(--text-body);
  line-height: 1.6;
  cursor: pointer;
}

/* --- Text area for justification --- */
.exercise__justification {
  margin-bottom: var(--space-md);
}

.exercise__justification label {
  display: block;
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--ink-muted);
  margin-bottom: var(--space-xs);
}

.exercise__justification textarea {
  width: 100%;
  min-height: 100px;
  padding: var(--space-sm);
  border: 1px solid var(--trace);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.6;
  color: var(--ink);
  background: white;
  resize: vertical;
  transition: border-color 0.15s ease;
}

.exercise__justification textarea:focus {
  outline: none;
  border-color: var(--structure);
  box-shadow: 0 0 0 3px rgba(45, 91, 227, 0.12);
}

.exercise__justification textarea:disabled {
  background: var(--ground);
  color: var(--ink-muted);
  cursor: not-allowed;
}

/* --- Commit button --- */
.exercise__commit {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.75rem var(--space-md);
  background: var(--structure);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.15s ease, opacity 0.15s ease;
}

.exercise__commit:hover:not(:disabled) {
  background: #2450C8;
}

.exercise__commit:focus-visible {
  outline: 3px solid var(--structure);
  outline-offset: 3px;
}

/* Disabled controls are exempt from the contrast minimum, but 40% opacity on a
   saturated blue was nearly illegible, a flat muted fill still reads as
   inactive while keeping the label readable. */
.exercise__commit:disabled {
  background: #C9C4BA;
  color: #4A4843;
  cursor: not-allowed;
}

/* --- Completion indicator (replaces commit button) --- */
.exercise__complete {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--found);
  padding: 0.75rem 0;
}

.exercise__complete svg {
  width: 1.125rem;
  height: 1.125rem;
  flex-shrink: 0;
}

/* --- Try again (created by progress.js once a chunk is committed) --- */
.exercise__retry {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-left: var(--space-md);
  padding: 0.75rem 0;
  background: none;
  border: none;
  font-family: var(--font-body);
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--structure);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.exercise__retry:hover {
  color: #2450C8;
}

.exercise__retry:focus-visible {
  outline: 3px solid var(--structure);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ============================================
   FEEDBACK ZONE
   ============================================ */
/* The answer key must be genuinely absent before the reader commits, not just
   invisible: the `hidden` attribute keeps it out of the accessibility tree and
   out of in-page find. progress.js removes the attribute on commit, then adds
   .is-revealed on the next frame so the reveal still animates. */
.feedback[hidden] {
  display: none;
}

.feedback {
  border-top: 1px solid var(--trace);
  padding-top: var(--space-lg);
  margin-top: var(--space-lg);

  /* Collapsed state, used only for the transition after `hidden` is removed */
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition:
    max-height var(--transition-reveal),
    opacity var(--transition-reveal);
}

.feedback.is-revealed {
  max-height: 2000px;
  opacity: 1;
}

.feedback:focus-visible {
  outline: 3px solid var(--found);
  outline-offset: 4px;
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  .feedback {
    transition: none;
  }
}

.feedback__zone-label {
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--found);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.feedback__zone-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--trace);
}

.feedback__body {
  font-size: var(--text-body);
  line-height: 1.75;
  color: var(--ink);
}

.feedback__body p + p {
  margin-top: var(--space-sm);
}

.feedback__body strong {
  font-weight: 600;
}

.feedback__body ul,
.feedback__body ol {
  margin-top: var(--space-sm);
  margin-bottom: var(--space-sm);
  padding-left: var(--space-md);
}

.feedback__body li {
  margin-bottom: var(--space-xs);
  line-height: 1.65;
}

/* Highlighted answer in feedback */
.feedback__highlight {
  display: block;
  margin: var(--space-md) 0;
  padding: var(--space-sm) var(--space-md);
  background: #F0F7F4;
  border-left: 3px solid var(--found);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: var(--text-body);
  line-height: 1.65;
}

/* ============================================
   CHUNK FOOTER NAV
   ============================================ */
.chunk-footer {
  margin-top: var(--space-xl);
  padding: var(--space-md) 0 var(--space-xl);
  border-top: 1px solid var(--trace);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-sm);
}

.chunk-footer a {
  font-size: var(--text-small);
  color: var(--structure);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.chunk-footer a:hover {
  text-decoration: underline;
}

.chunk-footer a:focus-visible {
  outline: 3px solid var(--structure);
  outline-offset: 3px;
  border-radius: 2px;
}

.chunk-footer__center {
  font-size: var(--text-small);
  color: var(--ink-subtle);
  text-align: center;
}

/* Forward link at the end of a chapter, the only emphasised link in the
   footer, since it is the one that keeps the reader moving. */
.chunk-footer__next-chapter {
  font-weight: 500;
}

.chunk-footer__next-chapter span {
  color: var(--ink-subtle);
  font-weight: 400;
}

/* ============================================
   COURSE HOME: Chapter cards
   ============================================ */
.course-home {
  padding: var(--space-xl) 0;
  text-align: center;
}

.course-home__header {
  margin-bottom: var(--space-xl);
}

.course-home__title {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 400;
  line-height: 1.2;
  color: var(--ink);
  margin-bottom: var(--space-sm);
}

.course-home__subtitle {
  font-size: var(--text-body);
  color: var(--ink-muted);
  max-width: 520px;
  margin-inline: auto;
  line-height: 1.65;
}

.course-home__note {
  margin-top: var(--space-md);
  font-size: var(--text-small);
  color: var(--ink-subtle);
  line-height: 1.6;
}

/* Keep prose and the search field at a readable measure even though the page
   shell is wide, only the card grid should use the full width. */
.course-home__header,
.course-home .site-search {
  max-width: var(--max-width);
  margin-inline: auto;
}

.course-home .site-search__input {
  text-align: center;
}

.course-home .chapter-card__progress {
  justify-content: center;
}

.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-md);
}

.chapter-card {
  display: block;
  background: white;
  border: 1px solid var(--trace);
  border-radius: var(--radius);
  padding: var(--space-md);
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.chapter-card:hover {
  border-color: var(--structure);
  box-shadow: 0 2px 12px rgba(45, 91, 227, 0.08);
}

.chapter-card:focus-visible {
  outline: 3px solid var(--structure);
  outline-offset: 3px;
}

.chapter-card__number {
  font-size: var(--text-small);
  color: var(--ink-subtle);
  margin-bottom: var(--space-xs);
  font-weight: 500;
}

.chapter-card__title {
  font-size: var(--text-title);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.35;
  margin-bottom: var(--space-xs);
}

.chapter-card__time {
  font-size: var(--text-small);
  color: var(--ink-subtle);
  margin-bottom: var(--space-md);
}

.chapter-card__progress {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.chapter-card__bar {
  flex: 1;
  height: 3px;
  background: var(--trace);
  border-radius: 2px;
  overflow: hidden;
}

.chapter-card__bar-fill {
  height: 100%;
  background: var(--found);
  border-radius: 2px;
  transition: width 0.3s ease;
}

.chapter-card__fraction {
  font-size: var(--text-small);
  color: var(--ink-subtle);
  white-space: nowrap;
}

/* --- Toolkit variant (appendix chapters, no exercises, no progress bar) --- */
.chapter-card--toolkit {
  border-left: 3px solid var(--found);
}

.chapter-card__toolkit-label {
  font-size: var(--text-small);
  color: var(--found);
  font-weight: 500;
}

/* ============================================
   CHAPTER PAGE: Chunk list
   ============================================ */
.chapter-page {
  padding: var(--space-xl) 0;
}

.chapter-page__back {
  font-size: var(--text-small);
  color: var(--structure);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-bottom: var(--space-lg);
}

.chapter-page__back:hover {
  text-decoration: underline;
}

.chapter-page__number {
  font-size: var(--text-small);
  color: var(--ink-subtle);
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.chapter-page__title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 400;
  line-height: 1.25;
  color: var(--ink);
  margin-bottom: var(--space-md);
}

.chapter-page__toolkit-note {
  font-size: var(--text-small);
  color: var(--ink-muted);
  line-height: 1.6;
  margin-bottom: var(--space-xl);
  max-width: 46ch;
}

.chunk-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.chunk-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.chunk-item__link {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  background: white;
  border: 1px solid var(--trace);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ink);
  font-size: var(--text-body);
  transition: border-color 0.15s ease;
  gap: var(--space-sm);
}

.chunk-item__link:hover {
  border-color: var(--structure);
}

.chunk-item__link:focus-visible {
  outline: 3px solid var(--structure);
  outline-offset: 3px;
}

.chunk-item__title {
  line-height: 1.4;
}

.chunk-item__status {
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  border: 1.5px solid var(--trace);
  background: transparent;
  transition: background 0.15s ease, border-color 0.15s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chunk-item__status.is-complete {
  background: var(--found);
  border-color: var(--found);
}

.chunk-item__status.is-complete svg {
  width: 0.65rem;
  height: 0.65rem;
  color: white;
}

/* ============================================
   UTILITY
   ============================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ============================================
   PROMPT-FILL ZONE
   Fill-in-the-blank AI prompt, live-assembled,
   copy-to-clipboard. No network calls, the
   reader pastes the result into their own AI tool.
   ============================================ */
.prompt-fill {
  margin-bottom: var(--space-lg);
  padding: var(--space-md);
  background: #FFFFFF;
  border: 1px solid var(--trace);
  border-left: 3px solid var(--found);
  border-radius: var(--radius);
}

.prompt-fill__zone-label {
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--found);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.prompt-fill__intro {
  font-size: var(--text-small);
  line-height: 1.7;
  color: var(--ink-muted);
  margin-bottom: var(--space-md);
}

/* --- RICE guidance toggle (collapsed by default) --- */
.prompt-fill__guidance {
  margin-bottom: var(--space-md);
  border: 1px solid var(--trace);
  border-radius: var(--radius);
  background: var(--ground);
}

.prompt-fill__guidance summary {
  cursor: pointer;
  padding: 0.6rem var(--space-sm);
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--structure);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  list-style: none;
}

.prompt-fill__guidance summary::-webkit-details-marker {
  display: none;
}

.prompt-fill__guidance summary::before {
  content: '▸';
  font-size: 0.65rem;
  transition: transform 0.15s ease;
  flex-shrink: 0;
}

.prompt-fill__guidance[open] summary::before {
  transform: rotate(90deg);
}

.prompt-fill__guidance-body {
  padding: 0 var(--space-sm) var(--space-sm);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xs);
}

.prompt-fill__guidance-body--simple {
  display: block;
  padding: 0 var(--space-sm) var(--space-sm);
}

.prompt-fill__guidance-body--simple p {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--ink-muted);
  margin-bottom: var(--space-xs);
}

.prompt-fill__guidance-body--simple ul {
  padding-left: 1.1rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--ink-muted);
}

.prompt-fill__guidance-item {
  background: white;
  border: 1px solid var(--trace);
  border-radius: var(--radius);
  padding: var(--space-xs) 0.6rem 0.6rem;
}

.prompt-fill__guidance-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.15rem;
  height: 1.15rem;
  border-radius: 50%;
  background: var(--structure);
  color: white;
  font-size: 0.65rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.prompt-fill__guidance-item h4 {
  font-size: var(--text-small);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.2rem;
}

.prompt-fill__guidance-item p {
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--ink-muted);
}

/* --- Fillable fields --- */
.prompt-fill__field {
  margin-bottom: var(--space-sm);
}

.prompt-fill__field-row {
  display: flex;
  gap: var(--space-sm);
}

.prompt-fill__field-row .prompt-fill__field {
  flex: 1;
  min-width: 0;
}

.prompt-fill__field label {
  display: block;
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 0.3rem;
}

.prompt-fill__hint {
  display: block;
  font-size: 0.8125rem;
  color: var(--ink-muted);
  margin-bottom: 0.35rem;
  line-height: 1.4;
}

.prompt-fill__field input[type="text"],
.prompt-fill__field select,
.prompt-fill__field textarea {
  width: 100%;
  padding: 0.6rem var(--space-sm);
  border: 1px solid var(--trace);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: var(--text-small);
  line-height: 1.5;
  color: var(--ink);
  background: white;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.prompt-fill__field textarea {
  min-height: 90px;
  resize: vertical;
}

.prompt-fill__field input:focus,
.prompt-fill__field select:focus,
.prompt-fill__field textarea:focus {
  outline: none;
  border-color: var(--found);
  box-shadow: 0 0 0 3px rgba(26, 122, 94, 0.12);
}

/* --- Assembled prompt preview + copy --- */
.prompt-fill__output {
  margin-top: var(--space-md);
}

.prompt-fill__output-label {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 0.5rem;
}

.prompt-fill__preview {
  display: block;
  background: var(--ink);
  color: var(--ground);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.65;
  padding: var(--space-md);
  border-radius: var(--radius);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 360px;
  overflow-y: auto;
  margin-bottom: var(--space-sm);
}

.prompt-fill__preview .is-unfilled {
  color: #E8963D;
}

.prompt-fill__copy,
.prompt-fill__copied {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.75rem var(--space-md);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.prompt-fill__copy {
  background: var(--found);
  color: white;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease;
}

.prompt-fill__copy:hover {
  background: #145F4A;
}

.prompt-fill__copy:focus-visible {
  outline: 3px solid var(--found);
  outline-offset: 3px;
}

.prompt-fill__copied {
  color: var(--found);
}

.prompt-fill__copied svg {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

/* Shown by prompt-fill.js when neither the async clipboard API nor the
   execCommand fallback is available: e.g. opened over file://, where the
   origin is not a secure context and navigator.clipboard is undefined. */
.prompt-fill__copy-error {
  display: block;
  margin-top: var(--space-xs);
  font-size: var(--text-small);
  line-height: 1.5;
  color: #8A3A18;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 600px) {
  :root {
    --text-display: 1.625rem;
    --space-lg: 2.25rem;
    --space-xl: 3rem;
  }

  .mini-nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .chapter-grid {
    grid-template-columns: 1fr;
  }

  .chunk-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .prompt-fill__field-row {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .prompt-fill__guidance-body {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   PROMPT LIBRARY
   ============================================ */
.library-header {
  padding-top: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.library-header h1 {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: var(--space-xs);
}

.library-header p {
  font-size: var(--text-small);
  color: var(--ink-muted);
  max-width: 52ch;
  line-height: 1.6;
}

.library-controls {
  margin-bottom: var(--space-lg);
  position: sticky;
  top: 0;
  background: var(--ground);
  padding: var(--space-sm) 0;
  z-index: 5;
}

.library-search {
  width: 100%;
  padding: 0.7rem var(--space-sm);
  border: 1px solid var(--trace);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: var(--text-body);
  color: var(--ink);
  background: white;
  margin-bottom: var(--space-sm);
}

.library-search:focus {
  outline: none;
  border-color: var(--found);
  box-shadow: 0 0 0 3px rgba(26, 122, 94, 0.12);
}

.library-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.library-filter {
  font-family: var(--font-body);
  font-size: var(--text-small);
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--trace);
  border-radius: 999px;
  background: white;
  color: var(--ink-muted);
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.library-filter:hover {
  color: var(--ink);
  border-color: var(--found);
}

.library-filter:focus-visible {
  outline: 3px solid var(--found);
  outline-offset: 2px;
}

.library-filter.is-active {
  background: var(--found);
  border-color: var(--found);
  color: white;
}

.library-count {
  font-size: var(--text-small);
  color: var(--ink-subtle);
  margin-bottom: var(--space-sm);
}

.library-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: var(--space-sm);
  padding-bottom: var(--space-xl);
}

.library-item__link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--trace);
  border-left: 3px solid var(--found);
  border-radius: var(--radius);
  background: white;
  text-decoration: none;
  color: var(--ink);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

.library-item__link:hover {
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  transform: translateY(-1px);
}

.library-item__link:focus-visible {
  outline: 3px solid var(--found);
  outline-offset: 2px;
}

.library-item__category {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--structure);
  margin-bottom: 0.3rem;
}

.library-item__title {
  display: block;
  font-weight: 500;
  font-size: var(--text-body);
  margin-bottom: 0.2rem;
}

.library-item__purpose {
  display: block;
  font-size: var(--text-small);
  color: var(--ink-muted);
  line-height: 1.5;
}

.library-item.is-hidden {
  display: none;
}

.library-empty {
  font-size: var(--text-small);
  color: var(--ink-muted);
  padding: var(--space-lg) 0;
  display: none;
}

.library-empty.is-visible {
  display: block;
}

/* --- Home page: link to library + chapter card badges --- */
.home-library-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem var(--space-md);
  border: 1px solid var(--found);
  border-radius: 999px;
  color: var(--found);
  font-size: var(--text-small);
  font-weight: 500;
  text-decoration: none;
  margin-bottom: var(--space-lg);
  transition: background 0.15s ease;
}

.home-library-link:hover {
  background: rgba(26, 122, 94, 0.08);
}

.chapter-card__prompt-count {
  display: inline-block;
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--found);
  margin-top: 0.3rem;
}

/* --- Chapter chunk-list: prompt tag --- */
.chunk-item__prompt-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--found);
  border: 1px solid var(--found);
  border-radius: 999px;
  padding: 0.1rem 0.5rem;
  margin-left: 0.5rem;
  vertical-align: middle;
}

/* --- Reset all progress (course home) --- */
.progress-reset {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-top: var(--space-xs);
  padding: 0;
  background: none;
  border: none;
  font-family: var(--font-body);
  font-size: var(--text-small);
  color: var(--structure);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.progress-reset:hover {
  color: #2450C8;
}

.progress-reset:focus-visible {
  outline: 3px solid var(--structure);
  outline-offset: 3px;
  border-radius: 2px;
}

.progress-reset__done {
  display: block;
  margin-top: var(--space-xs);
  font-size: var(--text-small);
  color: var(--found);
}

/* ============================================
   SITE SEARCH (home page)
   ============================================ */
.site-search {
  margin-bottom: var(--space-lg);
}

.site-search__input {
  width: 100%;
  padding: 0.85rem var(--space-md);
  border: 1px solid var(--trace);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--ink);
  background: white;
}

.site-search__input:focus {
  outline: none;
  border-color: var(--found);
  box-shadow: 0 0 0 3px rgba(26, 122, 94, 0.12);
}

.site-search__count {
  font-size: var(--text-small);
  color: var(--ink-muted);
  margin-top: 0.6rem;
  min-height: 1.2em;
}

.site-search__results {
  list-style: none;
  display: none;
  flex-direction: column;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.site-search__results.is-visible {
  display: flex;
}

.site-search__item-link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--trace);
  border-radius: var(--radius);
  background: white;
  text-decoration: none;
  color: var(--ink);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

.site-search__item-link:hover {
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  transform: translateY(-1px);
}

.site-search__item-link:focus-visible {
  outline: 3px solid var(--found);
  outline-offset: 2px;
}

.site-search__item-type {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  margin-right: 0.5rem;
}

.site-search__item-type--lesson {
  color: var(--structure);
  border: 1px solid var(--structure);
}

.site-search__item-type--prompt {
  color: var(--found);
  border: 1px solid var(--found);
}

.site-search__item-chapter {
  font-size: 0.75rem;
  color: var(--ink-subtle);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.site-search__item-title {
  display: block;
  font-weight: 500;
  font-size: var(--text-body);
  margin: 0.25rem 0 0.15rem;
}

.site-search__item-snippet {
  display: block;
  font-size: var(--text-small);
  color: var(--ink-muted);
  line-height: 1.5;
}