/* ==========================================================================
   Case study layout — shared by every case study page.
   Loaded after shared.css; values come from tokens.css.
   ========================================================================== */

/* Page frame ----------------------------------------------------------- */

/* Wider than .container so visuals have room; text stays in .cs-body. */
.cs {
  max-width: 1080px;
  margin: 0 auto;
  padding: var(--space-80) var(--space-52) var(--space-120);
  display: flex;
  flex-direction: column;
  gap: var(--space-80);
}

/* Readable text column, used inside full-width rows */
.cs-body {
  max-width: 680px;
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
}

.cs-body p,
.cs-body li {
  font: var(--type-lg);
  letter-spacing: var(--tracking-text);
  color: var(--color-primary-ink);
}

.cs-body h3 {
  font: var(--type-lg-2);
  letter-spacing: var(--tracking-text);
  color: var(--color-primary-ink);
  margin-top: var(--space-8);
}

/* At-a-glance header --------------------------------------------------- */

.cs-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-40);
}

.cs-title {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.cs-title h1 {
  font: var(--type-5xl-2);
  letter-spacing: var(--tracking-headline);
  color: var(--color-primary-ink);
}

.cs-title .cs-status {
  margin-top: var(--space-8);
}

.cs-tagline {
  font: var(--type-2xl-2);
  letter-spacing: var(--tracking-headline);
  color: var(--color-mid-gray);
}

.cs-meta {
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr) minmax(0, 1fr);
  padding: var(--space-16) 0;
  border-top: 1px solid var(--color-hairline);
  border-bottom: 1px solid var(--color-hairline);
}

/* Each fact is divided from the next by a hairline */
.cs-meta > div {
  padding: 0 var(--space-24);
  border-left: 1px solid var(--color-hairline);
}

.cs-meta > div:first-child {
  padding-left: 0;
  border-left: 0;
}

.cs-meta dt {
  font: var(--type-sm);
  letter-spacing: var(--tracking-text);
  color: var(--color-mid-gray);
  margin-bottom: var(--space-4);
}

.cs-meta dd {
  font: var(--type-sm);
  letter-spacing: var(--tracking-text);
  color: var(--color-primary-ink);
}

/* Outcomes panel: the header's results, set apart from the facts above */
.cs-outcomes {
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
  padding: var(--space-28) var(--space-32);
  border-radius: var(--radius-lg);
  background: rgba(0, 113, 227, 0.06);
}

.cs-outcomes h2 {
  font: var(--type-lg-2);
  letter-spacing: var(--tracking-text);
  color: var(--color-primary-ink);
}

.cs-tldr {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-32);
  counter-reset: tldr;
}

.cs-tldr li {
  font: var(--type-lg);
  letter-spacing: var(--tracking-text);
  color: var(--color-primary-ink);
  counter-increment: tldr;
}

.cs-tldr li::before {
  content: "0" counter(tldr);
  display: block;
  font: var(--type-sm-2);
  color: var(--color-link-blue);
  margin-bottom: var(--space-8);
}

/* Core question -------------------------------------------------------- */

.cs-statement {
  max-width: 880px;
  font: var(--type-4xl);
  letter-spacing: var(--tracking-headline);
  color: var(--color-primary-ink);
}

/* Fills from gray to ink as it scrolls into view, where supported */
@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    .cs-statement {
      animation: cs-ink-in linear both;
      animation-timeline: view();
      animation-range: entry 20% cover 45%;
    }
  }
}

@keyframes cs-ink-in {
  from { color: var(--color-hairline); }
  to   { color: var(--color-primary-ink); }
}

/* Labeled sections: small label left, body right ------------------------ */

.cs-section {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: var(--space-32);
  align-items: start;
}

.cs-label {
  font: var(--type-xs-5);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-mid-gray);
  padding-top: var(--space-4);
}

/* Lists inside sections */
.cs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.cs-list li {
  position: relative;
  padding-left: var(--space-16);
}

.cs-list li::before {
  content: "\2022";
  position: absolute;
  left: 0;
  color: var(--color-mid-gray);
}

/* Side-by-side lists, e.g. team vs. subscriber problems */
.cs-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-32);
  margin-top: var(--space-8);
}

.cs-columns > div {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.cs-columns h3 {
  margin-top: 0;
}

.cs-chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
}

.cs-chips li {
  font: var(--type-sm);
  letter-spacing: var(--tracking-text);
  color: var(--color-deep-gray);
  padding: var(--space-4) var(--space-12);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-full);
}

/* Numbered principles */
.cs-principles {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-24);
  counter-reset: principle;
}

.cs-principles li {
  counter-increment: principle;
  display: grid;
  grid-template-columns: var(--space-32) minmax(0, 1fr);
}

.cs-principles li::before {
  content: counter(principle);
  font: var(--type-lg-2);
  color: var(--color-mid-gray);
}

.cs-principles strong {
  display: block;
  font: var(--type-lg-2);
  margin-bottom: var(--space-4);
}

/* Figures: stats and big impact numbers --------------------------------- */

.cs-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-24);
  margin: var(--space-8) 0;
}

.cs-stat-value {
  display: block;
  font: var(--type-3xl-2);
  letter-spacing: var(--tracking-headline);
  color: var(--color-primary-ink);
}

.cs-stat-label {
  display: block;
  margin-top: var(--space-4);
  font: var(--type-sm);
  letter-spacing: var(--tracking-text);
  color: var(--color-mid-gray);
}

.cs-stats--large .cs-stat-value {
  font: var(--type-5xl-2);
  letter-spacing: var(--tracking-headline);
}

/* Pinned decisions: text stays put while the visual scrolls past -------- */

.cs-decisions {
  display: flex;
  flex-direction: column;
  gap: var(--space-120);
}

.cs-decision {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: var(--space-52);
  align-items: start;
}

.cs-decision-text {
  position: sticky;
  top: var(--space-80);
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.cs-decision-text h3 {
  font: var(--type-2xl-2);
  letter-spacing: var(--tracking-headline);
  color: var(--color-primary-ink);
}

.cs-decision-text p {
  font: var(--type-lg);
  letter-spacing: var(--tracking-text);
  color: var(--color-primary-ink);
}

.cs-decision-num {
  font: var(--type-sm-2);
  color: var(--color-mid-gray);
}

/* Diagram panel: gray stage behind diagrams built in HTML ------------- */

.cs-panel {
  border-radius: var(--radius-3xl);
  background: var(--surface-canvas-gray);
  padding: var(--space-32);
}

/* White cards that sit on a panel */
.cs-card {
  padding: var(--space-20) var(--space-24);
  border-radius: var(--radius-lg);
  background: var(--color-paper);
}

.cs-card h4 {
  font: var(--type-lg-2);
  letter-spacing: var(--tracking-text);
  color: var(--color-primary-ink);
  margin-bottom: var(--space-4);
}

.cs-card p {
  font: var(--type-sm);
  letter-spacing: var(--tracking-text);
  color: var(--color-deep-gray);
}

/* Figures: real images that replace placeholders ----------------------- */

.cs-figure {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.cs-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-3xl);
  background: var(--surface-canvas-gray);
}

.cs-figure figcaption {
  font: var(--type-sm);
  letter-spacing: var(--tracking-text);
  color: var(--color-mid-gray);
  max-width: 680px;
}

/* Collaborators and next case study ------------------------------------- */

.cs-credits {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.cs-credits li {
  font: var(--type-lg);
  letter-spacing: var(--tracking-text);
  color: var(--color-primary-ink);
}

.cs-credits span {
  margin-left: var(--space-8);
  color: var(--color-mid-gray);
}

.cs-next {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  padding-top: var(--space-40);
  border-top: 1px solid var(--color-hairline);
  text-decoration: none;
  color: var(--color-primary-ink);
}

.cs-next-label {
  font: var(--type-sm);
  letter-spacing: var(--tracking-text);
  color: var(--color-mid-gray);
}

.cs-next-title {
  display: inline-flex;
  align-items: center;
  gap: var(--space-12);
  font: var(--type-4xl);
  letter-spacing: var(--tracking-headline);
}

.cs-next-title svg {
  width: 28px;
  height: 28px;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.cs-next:hover .cs-next-title {
  color: var(--color-link-blue);
}

.cs-next:hover .cs-next-title svg {
  transform: translateX(6px);
}

@media (prefers-reduced-motion: reduce) {
  .cs-next-title svg {
    transition: none;
  }
}

/* Mobile --------------------------------------------------------------- */

@media (max-width: 860px) {
  .cs-decision {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-24);
  }

  .cs-decision-text {
    position: static;
  }

  .cs-decisions {
    gap: var(--space-80);
  }

  /* Stacked under its text, a portrait tile would fill the whole screen */
  .ph--tall .ph-tile {
    aspect-ratio: 4 / 3;
  }
}

@media (max-width: 730px) {
  .cs {
    padding: var(--space-76) var(--space-24) var(--space-80);
    gap: var(--space-52);
  }

  .cs-title h1 {
    font: var(--type-3xl-2);
    letter-spacing: var(--tracking-headline);
  }

  .cs-tagline {
    font: var(--type-xl-3);
  }

  .cs-meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-16) 0;
  }

  .cs-meta > div {
    padding: 0 var(--space-16);
  }

  .cs-meta > div:nth-child(odd) {
    padding-left: 0;
    border-left: 0;
  }

  .cs-outcomes {
    padding: var(--space-20);
  }

  .cs-tldr,
  .cs-columns {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-20);
  }

  .cs-statement {
    font: var(--type-2xl-2);
    letter-spacing: var(--tracking-headline);
  }

  .cs-section {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-12);
  }

  .cs-stats--large .cs-stat-value {
    font: var(--type-4xl);
  }

  .cs-next-title {
    font: var(--type-2xl-2);
  }

  .cs-figure img {
    border-radius: var(--radius-lg);
  }

  .cs-panel {
    padding: var(--space-20);
    border-radius: var(--radius-lg);
  }
}