/*
 * Shared building blocks for the case studies under /work/<slug>/.
 * Rules and reasoning: CASE-STUDY-STANDARD.md.
 * Load after case-chapters.css and before the page's own <slug>-story.css,
 * so a story file can still place a component inside its own layout.
 * All values come from css/tokens.css (DESIGN-TOKENS.md).
 */

/* ---------- Hero ---------- */

/* custom.css gives every <section> 2rem padding below 768 px. Heroes bring
   their own spacing; on photo heroes the padding showed as a black band. */
section.case-hero {
  padding-top: 0;
  padding-bottom: 0;
}

/* ---------- Headings (for Tailwind markup; story files use the tokens) ---------- */

.case-h1 {
  font-family: var(--font-sans);
  font-size: var(--text-h1);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-h1);
  letter-spacing: var(--tracking-heading);
}

.case-h2 {
  font-family: var(--font-sans);
  font-size: var(--text-h2);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-h2);
  letter-spacing: var(--tracking-heading);
  text-wrap: balance;
}

/* ---------- Skip link ---------- */

.case-skip {
  position: fixed;
  z-index: var(--z-skip);
  top: 16px;
  left: 16px;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--color-ink);
  font: 600 14px/1.2 var(--font-sans);
  text-decoration: none;
  transform: translateY(-200%);
}

.case-skip:focus {
  transform: none;
}

/* ---------- Chapter label ---------- */

/* "01 / Starting point" – the same words as in the chapter bar. */
.case-eyebrow {
  display: block;
  margin: 0 0 var(--space-6);
  color: var(--color-accent);
  font: var(--weight-bold) var(--text-label)/var(--leading-label) var(--font-sans);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.case-eyebrow--on-dark {
  color: var(--color-accent-on-dark);
}

/* ---------- Key facts: Role · Timeframe · Context · Status ---------- */

.case-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 32px;
  margin: 32px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid rgba(127, 127, 127, 0.4);
  border-top-color: color-mix(in srgb, currentColor 28%, transparent);
  font-family: var(--font-sans);
}

@media (min-width: 768px) {
  .case-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .case-facts dd {
    font-size: 15px;
  }
}

.case-facts > div {
  min-width: 0;
}

.case-facts dt {
  margin: 0 0 var(--space-2);
  font-size: var(--text-micro);
  font-weight: var(--weight-bold);
  line-height: 1.3;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  opacity: 0.8;
}

.case-facts dd {
  margin: 0;
  font-size: 14px;
  font-weight: var(--weight-semibold);
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.case-facts b,
.case-facts strong {
  font: inherit;
}

/* !important: the global link rule in custom.css removes underlines with a
   much higher specificity; links in facts and credits must stay visible. */
.case-facts a {
  text-decoration: underline !important;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

/* ---------- Reflection in "What remains" ---------- */

/* At least one sentence of self-criticism ("What I would do differently").
   Same look as the reflection blocks on MNEMO and Albturm. */
.case-reflection {
  max-width: 760px;
  margin: 40px 0 0;
  padding-left: 28px;
  border-left: 3px solid var(--color-accent);
  font-family: var(--font-sans);
}

.case-reflection__label {
  margin: 0 0 var(--space-3);
  color: var(--color-accent);
  font-size: var(--text-label);
  font-weight: var(--weight-bold);
  line-height: var(--leading-label);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.case-reflection p:not(.case-reflection__label) {
  margin: 0;
  color: inherit;
  font-size: 18px;
  font-weight: var(--weight-medium);
  line-height: 1.6;
}

.case-reflection--on-dark {
  border-left-color: var(--color-accent-on-dark);
}

.case-reflection--on-dark .case-reflection__label {
  color: var(--color-accent-on-dark);
}

@media (max-width: 767.98px) {
  .case-reflection {
    padding-left: 20px;
  }

  .case-reflection p:not(.case-reflection__label) {
    font-size: 16px;
  }
}

/* ---------- Credits at the end of "What remains" ---------- */

.case-credits {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: 20px 32px;
  margin: 40px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid rgba(127, 127, 127, 0.4);
  border-top-color: color-mix(in srgb, currentColor 22%, transparent);
  font-family: var(--font-sans);
}

.case-credits dt {
  margin: 0 0 6px;
  font-size: var(--text-micro);
  font-weight: var(--weight-bold);
  line-height: 1.3;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  opacity: 0.72;
}

.case-credits dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
}

.case-credits a {
  text-decoration: underline !important;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

/* ---------- Next project ---------- */

/* Order follows the cards on the home page; the last card points to the
   first. */
.case-next {
  padding: var(--space-16) 0;
  background: var(--color-accent);
  color: #fff;
  font-family: var(--font-sans);
}

.case-next__inner {
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: space-between;
  gap: 32px;
  width: min(100%, 1440px);
  margin-inline: auto;
  padding-inline: 16px;
}

.case-next__label {
  margin: 0 0 12px;
  color: var(--color-ink-on-dark-body);
  font-size: var(--text-micro);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-label);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.case-next__title {
  margin: 0;
  color: #fff;
  font-size: 32px;
  font-weight: var(--weight-semibold);
  line-height: 1.1;
  letter-spacing: -0.5px;
}

.case-next__text {
  max-width: 480px;
  margin: 12px 0 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: 16px;
  line-height: 1.6;
}

/* !important: the global link rule in custom.css sets display and color on
   every link with a much higher specificity. */
.case-next__link {
  display: inline-block !important;
  flex: none;
  padding: 16px 32px;
  border-radius: var(--radius-pill);
  background: #fff;
  color: var(--color-accent) !important;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  text-decoration: none !important;
  white-space: nowrap;
  transition: background-color var(--dur-fast) var(--ease-standard);
}

.case-next__link:hover {
  background: var(--color-surface-alt);
}

@media (min-width: 640px) {
  .case-next__inner {
    padding-inline: 24px;
  }
}

@media (min-width: 768px) {
  .case-next {
    padding: 96px 0;
  }

  .case-next__inner {
    flex-direction: row;
    align-items: flex-end;
  }

  .case-next__title {
    font-size: 48px;
  }
}

@media (min-width: 1024px) {
  .case-next__inner {
    padding-inline: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .case-next__link {
    transition: none;
  }
}

/* ======================================================================
   Show, don't explain (Plooi pilot, 23.10.2026)
   Building blocks for cases told through pictures and short loops rather
   than process prose. Rules: CASE-STUDY-STANDARD.md, section 3.4.
   ====================================================================== */

/* ---------- Numbered circle ---------- */
/* Blue outline, filled while active. Used by pairs and the stage. */
.case-num {
  display: inline-flex;
  flex: none;
  align-items: center;
  justify-content: center;
  width: var(--space-8);
  height: var(--space-8);
  border: 1.5px solid var(--color-accent);
  border-radius: var(--radius-round);
  color: var(--color-accent);
  font: var(--weight-semibold) var(--text-caption)/1 var(--font-sans);
  font-variant-numeric: tabular-nums;
  transition: background-color var(--dur-base) var(--ease-out), color var(--dur-base) var(--ease-out);
}

/* ---------- Loop: a short, silent recording of real material ---------- */
/* <figure class="case-loop"><video loop muted playsinline preload="none"
   poster="…" width="…" height="…" aria-label="…"></video>
   <figcaption>Sentence. · Actual interface</figcaption></figure>
   Played and paused by initLoopingVideos() in js/main.js. */
.case-loop {
  display: grid;
  gap: var(--space-3);
  margin: 0;
}
.case-loop video,
.case-loop img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}
.case-loop figcaption,
.case-strip figcaption {
  color: var(--color-ink-muted);
  font: var(--text-caption)/var(--leading-caption) var(--font-sans);
}

/* ---------- Strip: process pictures with captions of a few words ---------- */
.case-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}
.case-strip figure {
  display: grid;
  align-content: start;
  gap: var(--space-3);
  margin: 0;
}
.case-strip img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: left top;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

/* ---------- Pairs: what I kept running into, and the rule it led to ---------- */
.case-pairs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-sans);
}
.case-pairs > li {
  display: grid;
  align-content: start;
  gap: var(--space-3);
  padding: var(--space-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.case-pairs__seen {
  margin: 0;
  color: var(--color-ink-muted);
  font-size: var(--text-small);
  line-height: var(--leading-small);
}
.case-pairs__rule {
  margin: 0;
  color: var(--color-ink);
  font-size: var(--text-h4);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-h4);
  letter-spacing: var(--tracking-h3);
  text-wrap: balance;
}

/* ---------- Stage: the steps of a mechanism, each with its loop ---------- */
/* Without JS, below 1024 px and with reduced motion: a list, medium beside
   or above its text. js/case-stage.js turns it into a scroll stage from
   1024 px: the media move into one sticky frame and change with the step in
   view. At most one stage per case, about 200vh of scrolling.
   <div class="case-stage"><ol class="case-stage__steps"><li class="case-stage__step">
   <figure class="case-stage__media">…</figure><div class="case-stage__text">
   <span class="case-num">1</span><h3 class="case-stage__title">…</h3><p>…</p>
   <p class="case-stage__point">…</p><p class="case-stage__origin">Actual interface</p>
   .case-stage--media-end puts the medium after the text. */
.case-stage {
  font-family: var(--font-sans);
}
.case-stage__steps {
  display: grid;
  gap: var(--space-block);
  margin: 0;
  padding: 0;
  list-style: none;
}
.case-stage__step {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  align-items: center;
  gap: var(--space-6) var(--space-12);
}
.case-stage--media-end .case-stage__step {
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
}
.case-stage--media-end .case-stage__media {
  order: 2;
}
.case-stage__media {
  margin: 0;
  min-width: 0;
}
.case-stage__media video,
.case-stage__media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}
.case-stage__text {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-content: center;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}
.case-stage__text > :not(.case-num):not(.case-stage__title) {
  grid-column: 1 / -1;
}
.case-stage__title {
  margin: 0;
  color: var(--color-ink);
  font-size: var(--text-h4);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-h4);
  letter-spacing: var(--tracking-h3);
}
.case-stage__text p {
  margin: 0;
  color: var(--color-ink-body);
  font-size: var(--text-body);
  line-height: var(--leading-body);
}
.case-stage__text .case-stage__point {
  color: var(--color-ink);
  font-style: italic;
  line-height: var(--leading-lead);
}
.case-stage__text .case-stage__origin {
  color: var(--color-ink-muted);
  font-size: var(--text-caption);
  line-height: var(--leading-caption);
}
/* Text alternative of the medium, kept in its step while the frame shows
   only the active medium. Visually hidden. */
.case-stage__alt {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}
@media (max-width: 767.98px) {
  .case-stage__step,
  .case-stage--media-end .case-stage__step {
    grid-template-columns: minmax(0, 1fr);
  }
  .case-stage--media-end .case-stage__media {
    order: 0;
  }
}

/* Scroll stage, set up by js/case-stage.js. */
.case-stage.is-staged {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  align-items: start;
  gap: 0 var(--space-12);
}
.case-stage.is-staged > .case-stage__frame {
  position: sticky;
  top: calc(var(--scroll-offset) + var(--space-6));
  grid-column: 1;
  grid-row: 1;
  display: grid;
  gap: var(--space-3);
  /* The whole frame, progress row included, fits below the bars. */
  width: min(100%, calc((100vh - var(--scroll-offset) - var(--space-24)) * 1.6));
}
.case-stage.is-staged > .case-stage__steps {
  grid-column: 2;
  grid-row: 1;
  gap: 0;
}
.case-stage.is-staged .case-stage__step {
  grid-template-columns: minmax(0, 1fr);
  align-content: center;
  /* All steps together take about 200vh of scrolling (js/case-stage.js
     falls back to the list when they would need clearly more). */
  min-height: calc(200vh / var(--stage-steps, 6));
  padding-block: var(--space-4);
}
.case-stage.is-staged .case-stage__step:not(.is-active) .case-stage__text {
  /* Dimmed, but body text stays above 4.5 : 1. */
  opacity: 0.78;
}
.case-stage.is-staged .case-stage__origin {
  display: none;
}
.case-stage--media-end.is-staged {
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
}
.case-stage--media-end.is-staged > .case-stage__frame {
  grid-column: 2;
  justify-self: end;
}
.case-stage--media-end.is-staged > .case-stage__steps {
  grid-column: 1;
}
.case-stage__step.is-active .case-num {
  background: var(--color-accent);
  color: var(--color-ink-on-dark);
}
.case-stage__screen {
  position: relative;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}
/* The focus ring goes on the frame; the video itself sits inside a clip. */
.case-stage__screen:has(video:focus-visible) {
  outline: var(--focus-width) solid var(--color-accent);
  outline-offset: var(--focus-offset);
}
.case-stage__screen video:focus-visible {
  outline: none;
}
.case-stage__screen .case-stage__media {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: inherit;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-slow) var(--ease-out), visibility 0s linear var(--dur-slow);
}
.case-stage__screen .case-stage__media.is-active {
  opacity: 1;
  visibility: visible;
  transition-delay: 0s;
}
.case-stage__screen .case-stage__media video,
.case-stage__screen .case-stage__media img {
  height: 100%;
  object-fit: contain;
  border: 0;
  border-radius: 0;
}
.case-stage__progress {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
}
.case-stage__bars {
  flex: 1 1 50%;
  display: grid;
  grid-template-columns: repeat(var(--stage-steps, 6), minmax(0, 1fr));
  gap: var(--space-2);
}
.case-stage__bars span {
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--color-line);
  transition: background-color var(--dur-base) var(--ease-out);
}
.case-stage__bars span.is-done {
  background: var(--color-accent);
}
.case-stage__count {
  color: var(--color-ink-muted);
  font: var(--weight-bold) var(--text-label)/var(--leading-label) var(--font-sans);
  letter-spacing: var(--tracking-label);
  font-variant-numeric: tabular-nums;
}
.case-stage__note {
  flex-basis: 100%;
  color: var(--color-ink-muted);
  font: var(--text-caption)/var(--leading-caption) var(--font-sans);
}

/* ---------- Limit: one honest line about what is not shown or not known ---------- */
/* <p class="case-limit"><span class="case-limit__label">Note</span>
   One sentence.</p> Not for the status line in "What remains" (E5). */
.case-limit {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2) var(--space-3);
  max-width: var(--measure);
  margin: 0;
  color: var(--color-ink-body);
  font: var(--text-small)/var(--leading-small) var(--font-sans);
}
.case-limit__label {
  flex: none;
  padding: 2px 10px;
  border: 1px solid var(--color-line-tint);
  border-radius: var(--radius-pill);
  background: var(--color-surface-tint);
  color: var(--color-accent);
  font-size: var(--text-micro);
  font-weight: var(--weight-bold);
  line-height: var(--leading-small);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

/* ---------- Lessons: what building it taught me ---------- */
.case-lessons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-sans);
}
.case-lessons > li {
  display: grid;
  align-content: start;
  gap: var(--space-3);
  padding: var(--space-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.case-lessons__num {
  color: var(--color-accent);
  font-size: var(--text-label);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-label);
  font-variant-numeric: tabular-nums;
}
.case-lessons h3 {
  margin: 0;
  color: var(--color-ink);
  font-size: var(--text-h4);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-h4);
  letter-spacing: var(--tracking-h3);
}
.case-lessons p {
  margin: 0;
  color: var(--color-ink-body);
  font-size: var(--text-small);
  line-height: var(--leading-small);
}

@media (prefers-reduced-motion: reduce) {
  .case-num,
  .case-stage__bars span,
  .case-stage__screen .case-stage__media {
    transition: none;
  }
}