/* =========================================================================
   Open Psychology Interactives — product layer stylesheet
   -------------------------------------------------------------------------
   Styles for the pages under library/ and lessons/. Loaded after
   assets/css/main.css and built entirely on its tokens, so the product
   layer looks like the site rather than like a second site. Nothing here
   is loaded by any activity page, and no rule targets an activity.

   Sections: 1 library controls and results; 2 activity page; 3 rendered
   Markdown; 4 forced colours and reduced motion.
   ========================================================================= */

/* -------------------------------------------------------------------------
   1. Library
   ------------------------------------------------------------------------- */

.library {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 56em) {
  .library {
    grid-template-columns: 17rem minmax(0, 1fr);
    align-items: start;
  }
  .library__filters {
    position: sticky;
    top: 5.5rem; /* below the sticky site header */
    /* Bounded to what is left of the viewport below the sticky point, so the
       column never runs taller than the screen. Search and Clear are outside
       .library__filter-groups and so stay put; only the fieldsets between
       them scroll, which is where Edition through Level can add up to more
       than a screenful. display: flex plus min-height: 0 is what lets a flex
       child (.library__filter-groups) shrink below its content size instead
       of forcing the column past max-height. */
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 5.5rem - var(--space-5));
    min-height: 0;
  }
  .library__filter-groups {
    overflow-y: auto;
    overscroll-behavior: contain;
    min-height: 0;
    /* Room for a scrollbar that does not sit on top of the focus ring or
       the checkboxes themselves. */
    padding-right: var(--space-2);
    margin-right: calc(var(--space-2) * -1);
  }
}

.library__search {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.library__search label {
  font-weight: 600;
}

.field {
  width: 100%;
  min-height: 2.75rem;
  padding: var(--space-2) var(--space-3);
  font: inherit;
  color: var(--colour-text);
  background: var(--colour-surface-raised);
  border: 1px solid var(--colour-border-strong);
  border-radius: var(--radius-md);
}

.field:focus-visible {
  outline: 3px solid var(--colour-focus);
  outline-offset: 2px;
}

.library__filters fieldset {
  margin: 0 0 var(--space-4);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-md);
  background: var(--colour-surface);
}

.library__filters legend {
  padding: 0 var(--space-1);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--colour-text-muted);
}

.choice {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 2.75rem;
  cursor: pointer;
}

.choice input {
  width: 1.25rem;
  height: 1.25rem;
  margin: 0;
  accent-color: var(--colour-accent);
  flex: none;
}

.choice input:focus-visible {
  outline: 3px solid var(--colour-focus);
  outline-offset: 2px;
}

.choice__count {
  margin-left: auto;
  font-size: var(--text-xs);
  color: var(--colour-text-muted);
}

.library__toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.library__count {
  margin: 0;
  font-weight: 600;
}

.button--small {
  min-height: 2.75rem;
  padding-block: var(--space-2);
  font-size: var(--text-sm);
}

.results {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.result {
  --result-accent: var(--colour-accent);
  position: relative;
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--colour-border);
  border-left: 4px solid var(--result-accent);
  border-radius: var(--radius-lg);
  background: var(--colour-surface);
}

.result--cognitive { --result-accent: var(--colour-cognitive); }
.result--research-methods { --result-accent: var(--colour-research-methods); }
.result--neuropsychology { --result-accent: var(--colour-neuropsychology); }
.result--social-critical-psychology { --result-accent: var(--colour-social-critical-psychology); }
.result--personality-individual-differences { --result-accent: var(--colour-personality-individual-differences); }

.result__eyebrow {
  margin: 0 0 var(--space-1);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--colour-text-muted);
}

.result__eyebrow .result__module {
  color: var(--result-accent);
}

.result__title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-lg);
  line-height: 1.3;
}

.result__summary {
  margin: 0 0 var(--space-3);
  color: var(--colour-text-muted);
  max-width: var(--measure);
}

.result__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0;
}

.results__empty {
  padding: var(--space-5);
  border: 1px dashed var(--colour-border-strong);
  border-radius: var(--radius-lg);
  color: var(--colour-text-muted);
}

/* -------------------------------------------------------------------------
   2. Activity page
   ------------------------------------------------------------------------- */

.chip-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0 0 var(--space-4);
  padding: 0;
}

.chip {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-sm);
  border: 1px solid var(--colour-border-strong);
  border-radius: 999px;
  background: var(--colour-surface);
}

.activity-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin: var(--space-4) 0 var(--space-5);
}

/* The copy repeated above the teaching notes: no leading margin, since it
   sits right under the section header rather than under the hero text. */
.activity-actions--repeat {
  margin-top: 0;
}

.activity-meta {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

@media (min-width: 48em) {
  .activity-meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

details.disclosure {
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-4);
  background: var(--colour-surface);
}

details.disclosure summary {
  min-height: 2.75rem;
  display: flex;
  align-items: center;
  font-weight: 600;
  cursor: pointer;
}

details.disclosure summary:focus-visible {
  outline: 3px solid var(--colour-focus);
  outline-offset: 2px;
}

.status-message {
  padding: var(--space-4);
  border: 1px solid var(--colour-border-strong);
  border-radius: var(--radius-md);
  background: var(--colour-surface);
}

/* -------------------------------------------------------------------------
   3. Rendered Markdown (teaching notes, lesson text)
   ------------------------------------------------------------------------- */

.notes {
  max-width: var(--measure);
}

.notes h2 {
  margin-top: var(--space-6);
  font-size: var(--text-xl);
}

.notes h3 {
  margin-top: var(--space-5);
  font-size: var(--text-lg);
}

.notes h4 {
  margin-top: var(--space-4);
  font-size: var(--text-base);
}

.notes p, .notes ul, .notes ol {
  margin: 0 0 var(--space-4);
}

.notes li + li {
  margin-top: var(--space-1);
}

.notes blockquote {
  margin: 0 0 var(--space-4);
  padding: var(--space-2) var(--space-4);
  border-left: 4px solid var(--colour-accent);
  background: var(--colour-surface);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.notes blockquote p:last-child {
  margin-bottom: 0;
}

.notes pre {
  margin: 0 0 var(--space-4);
  padding: var(--space-3) var(--space-4);
  overflow-x: auto;
  background: var(--colour-surface);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.notes code {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

.notes hr {
  margin: var(--space-5) 0;
  border: 0;
  border-top: 1px solid var(--colour-border);
}

.table-scroll {
  overflow-x: auto;
  margin: 0 0 var(--space-4);
}

.notes table {
  border-collapse: collapse;
  width: 100%;
  font-size: var(--text-sm);
}

.notes th, .notes td {
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--colour-border);
  text-align: left;
  vertical-align: top;
}

.notes th {
  background: var(--colour-surface);
}

/* -------------------------------------------------------------------------
   4. Forced colours and reduced motion
   ------------------------------------------------------------------------- */

@media (forced-colors: active) {
  .result, .library__filters fieldset, details.disclosure, .chip, .status-message {
    border-color: CanvasText;
  }
  .result {
    border-left-width: 4px;
  }
  .notes blockquote {
    border-left-color: CanvasText;
  }
}

@media (prefers-reduced-motion: reduce) {
  .library__filters {
    position: static;
  }
}

/* -------------------------------------------------------------------------
   5. Lesson builder
   ------------------------------------------------------------------------- */

.builder {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 64em) {
  .builder {
    grid-template-columns: minmax(0, 1fr) 22rem;
    align-items: start;
  }
  .builder__side {
    position: sticky;
    top: 5.5rem;
  }
}

.builder__field {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.builder__field label,
.builder__field .label {
  font-weight: 600;
}

.builder__hint {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--colour-text-muted);
}

textarea.field {
  min-height: 6rem;
  resize: vertical;
  line-height: 1.5;
}

.steps-list {
  list-style: none;
  margin: 0 0 var(--space-4);
  padding: 0;
  display: grid;
  gap: var(--space-3);
  counter-reset: step;
}

.step {
  --step-accent: var(--colour-border-strong);
  position: relative;
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--colour-border);
  border-left: 4px solid var(--step-accent);
  border-radius: var(--radius-lg);
  background: var(--colour-surface);
}

.step--activity { --step-accent: var(--colour-accent); }
.step--question { --step-accent: var(--colour-status-text); }

.step__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2) var(--space-3);
  margin-bottom: var(--space-3);
}

.step__label {
  margin: 0;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--colour-text-muted);
}

.step__title {
  margin: 0;
  font-size: var(--text-base);
  font-weight: 600;
}

.step__tools {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: var(--space-3) 0 0;
}

.builder__add {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.picker {
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  background: var(--colour-surface);
  margin-bottom: var(--space-5);
}

/* The compact picker's four facets in one row on a wide screen, wrapping to
   fewer as space runs out; kept to a fraction of the library's full-page
   fieldset stack, which is the point of a picker embedded in the builder
   rather than a page of its own. */
.picker__filters {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: var(--space-3);
  margin: var(--space-3) 0;
}

.picker__edition {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-3);
  margin: 0;
  padding: 0;
  border: 0;
}

.picker__edition legend {
  font-weight: 600;
  font-size: var(--text-sm);
  padding: 0;
  margin-right: var(--space-1);
}

.choice--compact {
  min-height: 2.25rem;
  gap: var(--space-1);
}

.choice--compact input {
  width: 1.1rem;
  height: 1.1rem;
}

.picker__results {
  list-style: none;
  margin: var(--space-3) 0 0;
  padding: 0;
  max-height: 24rem;
  overflow-y: auto;
  display: grid;
  gap: var(--space-2);
}

.picker__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-3);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-md);
  background: var(--colour-surface-raised);
}

.picker__meta {
  display: block;
  font-size: var(--text-xs);
  color: var(--colour-text-muted);
}

.link-box {
  display: grid;
  gap: var(--space-2);
}

.link-box textarea {
  min-height: 5rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  word-break: break-all;
}

.notice {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--colour-status-border);
  border-radius: var(--radius-md);
  background: var(--colour-status-bg);
  color: var(--colour-status-text);
  font-size: var(--text-sm);
}

.side-actions {
  display: grid;
  gap: var(--space-2);
}

.side-actions .button {
  width: 100%;
  text-align: center;
}

/* -------------------------------------------------------------------------
   6. Lesson player
   ------------------------------------------------------------------------- */

.player {
  display: grid;
  gap: var(--space-5);
}

@media (min-width: 64em) {
  .player {
    grid-template-columns: 16rem minmax(0, 1fr);
    align-items: start;
  }
  .player__nav {
    position: sticky;
    top: 5.5rem;
  }
}

.player__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-1);
}

.player__step-button {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  min-height: 2.75rem;
  padding: var(--space-2) var(--space-3);
  font: inherit;
  text-align: left;
  color: var(--colour-text);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
}

.player__step-button[aria-current="step"] {
  background: var(--colour-accent-soft);
  border-color: var(--colour-accent);
  font-weight: 600;
}

.player__step-button:focus-visible {
  outline: 3px solid var(--colour-focus);
  outline-offset: 2px;
}

.player__step-button .done {
  margin-left: auto;
  font-size: var(--text-xs);
  color: var(--colour-text-muted);
}

.player__stage-wrap {
  min-width: 0;
}

.player__stage {
  min-width: 0;
}

/* Deliberately not muted or uppercase, unlike a section eyebrow: this is the
   answer to "where am I", so it reads as content, not decoration. */
.player__progress {
  margin: 0 0 var(--space-2);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--colour-text);
}

.player__progress-bar {
  height: 0.5rem;
  margin-bottom: var(--space-5);
  border-radius: 999px;
  background: var(--colour-surface);
  border: 1px solid var(--colour-border);
  overflow: hidden;
}

.player__progress-fill {
  display: block;
  height: 100%;
  background: var(--colour-accent);
  /* Width is set per step from script; the transition is what turns
     "Continue" into a visible step forward rather than a page swap. */
  transition: width 0.3s ease;
}

.player__instructions {
  padding: var(--space-3) var(--space-4);
  margin: 0 0 var(--space-4);
  border-left: 4px solid var(--colour-accent);
  background: var(--colour-surface);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.player__frame-wrap {
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--colour-page);
}

.player__frame {
  display: block;
  width: 100%;
  min-height: 40rem;
  border: 0;
}

.player__frame-note {
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  color: var(--colour-text-muted);
}

.player__controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.answers {
  list-style: none;
  margin: 0 0 var(--space-4);
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.answers li {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-md);
  background: var(--colour-surface);
}

.answers .answers__prompt {
  margin: 0 0 var(--space-1);
  font-weight: 600;
}

.answers .answers__text {
  margin: 0;
  white-space: pre-wrap;
}

@media (forced-colors: active) {
  .step, .picker, .picker__item, .player__frame-wrap, .answers li, .notice {
    border-color: CanvasText;
  }
  .player__step-button[aria-current="step"] {
    border-color: Highlight;
  }
  .player__progress-bar {
    border-color: CanvasText;
  }
  .player__progress-fill {
    background: Highlight;
  }
}

@media (prefers-reduced-motion: reduce) {
  .builder__side, .player__nav {
    position: static;
  }
  .player__progress-fill {
    transition: none;
  }
}