/* =========================================================
   Case study — v2 system (ported from design-system project)
   Loaded AFTER styles.css to override the older cs-* rules.
   ========================================================= */

/* Variable aliases bridging to this project's palette */
:root {
  --paper: var(--bg);
  --paper-2: oklch(0.97 0.003 250);
  --paper-3: oklch(0.94 0.003 250);
  --line-strong: var(--line-2);
  --ink-4: oklch(0.62 0.004 250);
  --ink-5: oklch(0.78 0.004 250);
  --t-fast: 120ms;
  --t-base: 200ms;
  --t-slow: 400ms;
  --ease-out: cubic-bezier(0.2, 0.7, 0.2, 1);
  /* Unified image elevation — keep every screenshot/figure consistent */
  --img-shadow: 0 20px 44px -22px rgba(15, 30, 55, 0.30);
  --img-shadow-lift: 0 32px 60px -20px rgba(15, 30, 55, 0.42);
  --img-drop: drop-shadow(0 22px 42px rgba(15, 30, 55, 0.20));
}
:root.dark {
  --paper-2: oklch(0.17 0.004 250);
  --paper-3: oklch(0.22 0.004 250);
  --line-strong: var(--line-2);
  --ink-4: oklch(0.48 0.004 250);
  --ink-5: oklch(0.36 0.004 250);
}

/* Page wrapper — sets canvas width for case-study pages (match homepage --maxw) */
.cs-page .container { max-width: var(--maxw); }

/* =========================================================
   CASE STUDY HEADER
   ========================================================= */
.cs-page .cs-back {
  background: none;
  border: 0;
  padding: 8px 0;
  cursor: pointer;
  font: inherit;
  color: var(--ink-3);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  text-decoration: none;
  letter-spacing: 0;
  transition: color .2s var(--ease-out);
}
.cs-page .cs-back:hover { color: var(--ink); text-decoration: none; }

.cs-page .cs-hero {
  position: relative;
  padding: 64px var(--pad-page-x) 32px;
  max-width: var(--maxw);
  margin: 0 auto;
  text-align: center;
}
.cs-hero__eyebrow {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 28px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.cs-hero__title {
  font-family: var(--font-sans);
  font-size: clamp(40px, 5vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.04em;
  font-weight: 500;
  color: var(--ink);
  margin: 0 auto 20px;
  max-width: none;
  text-wrap: balance;
}
.cs-hero__sub {
  font-size: clamp(18px, 1.5vw, 22px);
  line-height: 1.5;
  color: var(--ink-3);
  max-width: none;
  margin: 0 auto 56px;
  font-weight: 400;
  text-wrap: balance;
  letter-spacing: -0.01em;
}

.cs-banner {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  aspect-ratio: 16/9;
  background-size: cover;
  background-position: center;
  background-color: var(--paper-2);
  border-radius: 18px;
  overflow: hidden;
}

/* Dossier */
.cs-dossier {
  /* Align the facts row to the same centered column as the banner above it */
  max-width: calc(900px + 2 * var(--pad-page-x));
  margin: 0 auto;
  padding: 56px var(--pad-page-x);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  border-bottom: 1px solid var(--line);
}
@media (max-width: 809px) {
  .cs-dossier { grid-template-columns: 1fr 1fr; }
}
.cs-dossier__col label {
  display: block;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--ink-4);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin-bottom: 12px;
}
.cs-dossier__col p {
  font-size: 18px;
  line-height: 1.55;
  color: var(--ink-2);
  margin: 0;
  font-weight: 400;
}
.cs-dossier__stack {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 18px;
  line-height: 1.55;
  color: var(--ink-2);
  font-weight: 400;
}
.cs-dossier__stack li { margin: 0; padding: 0; }

/* =========================================================
   BODY: STICKY TOC + CHAPTER GRID
   ========================================================= */
.cs-layout {
  /* Reading column width — between the full 1440px page (too wide) and the
     900px banner column (too narrow). Keeps the 150px TOC + 72px gutter. */
  max-width: 1320px;
  margin: 0 auto;
  padding: 80px var(--pad-page-x) 0;
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 72px;
  align-items: flex-start;
}
@media (max-width: 1199px) {
  .cs-layout { grid-template-columns: 1fr; gap: 24px; }
  .cs-page .cs-layout > .cs-toc { display: none; }
}

/* TOC */
.cs-page .cs-toc {
  position: sticky;
  top: 76px;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  padding: 0;
  display: block;
  margin: 0;
  border: 0;
  background: transparent;
  list-style: none;
}
.cs-page .cs-toc::-webkit-scrollbar { width: 4px; }
.cs-page .cs-toc::-webkit-scrollbar-thumb { background: var(--line); border-radius: 2px; }
.cs-toc__label {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--ink-4);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding-bottom: 14px;
  margin-bottom: 8px;
}
.cs-toc__list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0; }
.cs-toc__group { display: flex; flex-direction: column; }
.cs-toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.4;
  color: var(--ink-3);
  padding: 7px 0;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  width: 100%;
  transition: color var(--t-fast) var(--ease-out);
  font-weight: 400;
}
.cs-toc__link:hover { color: var(--ink); }
.cs-toc__num {
  font-family: var(--font-sans);
  font-size: 11px;
  color: var(--ink-5);
  letter-spacing: 0;
  font-variant-numeric: tabular-nums;
}
.cs-toc__link--active { color: var(--ink); font-weight: 500; }
.cs-toc__link--active .cs-toc__num { color: var(--ink-3); }
.cs-toc__subs {
  list-style: none;
  margin: 2px 0 6px 22px;
  padding: 0;
  border-left: 0;
  display: none;
  flex-direction: column;
  gap: 0;
}
.cs-toc__group--open .cs-toc__subs { display: flex; }
.cs-toc__sub-link {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.4;
  color: var(--ink-4);
  padding: 4px 0;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
}
.cs-toc__sub-link:hover { color: var(--ink); }
.cs-toc__sub-link--active { color: var(--ink); }

/* Chapters */
.cs-chapter {
  padding: 56px 0;
  border-top: 1px solid var(--line);
}
.cs-chapter:first-child { border-top: 0; padding-top: 0; }
.cs-chapter__num {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--ink-4);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 14px;
  font-weight: 500;
}
.cs-chapter__h {
  font-family: var(--font-sans);
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.06;
  letter-spacing: -0.035em;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 48px;
  max-width: none;
}
.cs-chapter__h em { font-style: italic; color: var(--ink-3); font-weight: 500; }

/* Sub-section */
.cs-sub {
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--line);
}
.cs-sub:first-of-type { margin-top: 0; padding-top: 0; border-top: 0; }
.cs-page .cs-prose .cs-problem-statement,
.cs-prose .cs-problem-statement,
.cs-problem-statement {
  font-family: var(--font-sans);
  font-size: clamp(26px, 2.4vw, 34px);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--ink);
  max-width: none;
  margin: 0 0 26px;
  text-wrap: pretty;
}
.cs-sub__label {
  font-family: var(--font-sans);
  font-size: 22px;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--ink);
  font-weight: 600;
  margin-bottom: 24px;
}
.cs-h-inline {
  font-family: var(--font-sans);
  font-size: 16px;
  letter-spacing: -0.015em;
  line-height: 1.2;
  color: var(--ink);
  font-weight: 500;
  margin-bottom: 14px;
}

/* Prose */
.cs-page .cs-prose { max-width: none; padding: 0; border: 0; background: transparent; }
.cs-page .cs-prose p {
  font-size: 18px;
  line-height: 1.7;
  color: var(--ink-2);
  margin: 0 0 18px;
  text-wrap: pretty;
  font-weight: 400;
  letter-spacing: 0;
  max-width: none;
}
.cs-page .cs-prose p:last-child { margin-bottom: 0; }
.cs-page .cs-prose strong { color: var(--ink); font-weight: 500; }
.cs-page .cs-prose em { font-style: italic; color: var(--ink-2); }

/* Subtle inline highlight for metrics — uses **double-asterisks** in content */
.cs-mark {
  background: transparent;
  color: var(--ink);
  font-weight: 500;
  padding: 0;
  border-radius: 0;
  border-bottom: 0;
  text-decoration: none;
}
.cs-page .cs-prose ul {
  list-style: none;
  padding: 0;
  margin: 12px 0 20px;
  display: block;
}
.cs-page .cs-prose ul li {
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink-2);
  padding: 0 0 0 24px;
  position: relative;
  margin-bottom: 8px;
  border: 0;
}
.cs-page .cs-prose ul li:last-child { border: 0; }
.cs-page .cs-prose ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 14px;
  width: 10px;
  height: 1px;
  background: var(--ink-4);
  transform: none;
  border: 0;
}

.cs-pullquote {
  font-family: var(--font-sans);
  font-size: clamp(24px, 2.4vw, 32px);
  line-height: 1.25;
  letter-spacing: -0.025em;
  color: var(--ink);
  font-weight: 500;
  font-style: italic;
  margin: 32px 0 28px;
  padding: 0;
  border: 0;
  max-width: none;
  text-wrap: pretty;
}

/* Problem statement — text + reviews image side by side */
.cs-problem-split {
  display: flex;
  align-items: center;
  gap: 48px;
}
.cs-problem-split .cs-prose { flex: 1 1 auto; min-width: 0; }
.cs-problem-split__fig {
  flex: 0 0 480px;
  max-width: 480px;
  margin: 0 !important;
}
.cs-problem-split__fig .cs-figure__img {
  border-radius: 10px;
  border: 1px solid var(--line);
}
@media (max-width: 900px) {
  .cs-problem-split { flex-direction: column; gap: 28px; }
  .cs-problem-split__fig { flex-basis: auto; max-width: 560px; }
}

/* Figures */
.cs-page .cs-figure {
  margin: 36px 0;
  max-width: 680px;
  padding: 0;
  background: transparent;
  border: 0;
  border-radius: 0;
  overflow: visible;
  aspect-ratio: auto;
}
.cs-figure__img {
  width: 100%;
  background: var(--paper-2);
  border-radius: 12px;
  background-size: cover;
  background-position: center;
}
.cs-figure__cap {
  font-size: 13px;
  color: var(--ink-4);
  margin-top: 12px;
  font-weight: 400;
  letter-spacing: 0;
}
.cs-bleed { margin: 40px 0; max-width: 680px; }

/* Research images */
.cs-page .cs-image {
  margin: 32px 0;
  background: #fff !important;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  max-width: 680px;
  overflow: hidden;
  aspect-ratio: auto !important;
}
.cs-image--wide { margin: 32px 0; max-width: 100%; }
.cs-page .cs-image img {
  display: block;
  width: 100%;
  height: auto;
  background: #fff !important;
  border-radius: 6px;
}
.cs-image__cap {
  font-size: 13px;
  color: var(--ink-4);
  margin: 20px 4px 4px;
  font-weight: 400;
  letter-spacing: 0;
}
.cs-image--tight-cap .cs-image__cap {
  margin-top: 8px;
}
.cs-image--roomy-cap .cs-image__cap {
  margin-top: 24px;
}
.cs-zoom-badge {
  position: absolute;
  top: 24px;
  right: 24px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 4px 10px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.18s ease;
}
.cs-image:hover .cs-zoom-badge {
  opacity: 1;
}
@media (hover: none) {
  .cs-zoom-badge { opacity: 1; }
}

/* Numbered list */
.cs-page .cs-numbered-list {
  list-style: none;
  margin: 16px 0 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 680px;
  padding: 0;
  border: 0;
}
.cs-numbered-list__item {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
  border-bottom: 0 !important;
  align-items: baseline;
}
.cs-numbered-list__item:last-child { border-bottom: 0; }
.cs-numbered-list__n {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--ink-4);
  font-variant-numeric: tabular-nums;
}
.cs-numbered-list__h {
  font-size: 17px;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 0 0 4px;
}
.cs-numbered-list__p {
  font-size: 15px;
  color: var(--ink-3);
  line-height: 1.55;
  margin: 0;
}

/* Method accordion */
.cs-page .cs-method {
  border-top: 1px solid var(--line);
  border-bottom: 0;
  max-width: 920px;
  margin: 0;
  padding: 0;
  display: block;
}
.cs-method__row { border-bottom: 1px solid var(--line); display: block; padding: 0; }
.cs-method__row:last-child { border-bottom: 0; }
.cs-method__btn {
  display: grid;
  grid-template-columns: 28px 1fr 24px;
  gap: 20px;
  width: 100%;
  padding: 28px 0;
  background: transparent;
  border: 0;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-sans);
  align-items: baseline;
  color: inherit;
}
.cs-method__btn:hover .cs-method__h { color: var(--ink-3); }
.cs-method__n {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--ink-4);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
  font-weight: 500;
}
.cs-method__h {
  font-size: 24px;
  letter-spacing: -0.025em;
  color: var(--ink);
  font-weight: 600;
  line-height: 1.2;
  transition: color var(--t-fast) var(--ease-out);
}
.cs-method__icon {
  font-size: 20px;
  color: var(--ink-4);
  font-family: var(--font-sans);
  font-weight: 400;
  transition: transform var(--t-base) var(--ease-out);
  text-align: center;
  line-height: 1;
  width: auto; height: auto;
  border: 0; background: transparent;
}
.cs-method__row--open .cs-method__icon { transform: rotate(45deg); }
.cs-method__body {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 20px;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--t-slow) var(--ease-out), padding var(--t-base) var(--ease-out);
  padding: 0;
  border: 0;
}
.cs-method__row--open .cs-method__body {
  max-height: 6000px;
  padding: 0 0 36px;
}
.cs-method__q {
  font-family: var(--font-sans);
  font-size: 18px;
  font-style: italic;
  color: var(--ink-3);
  font-weight: 400;
  line-height: 1.45;
  margin: 0 0 20px;
  letter-spacing: -0.005em;
  max-width: 680px;
  padding: 0;
}
.cs-method__q::before { content: none; }
.cs-method__summary {
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink-2);
  margin: 0 0 20px;
  max-width: 680px;
}
.cs-method__meta {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--ink-4);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 12px 0 20px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 24px;
}
.cs-method__meta b { color: var(--ink-2); font-weight: 500; }
.cs-method__implication {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 24px 0 0;
  padding: 0;
  max-width: 680px;
  white-space: pre-line;
}
.cs-method__findings-label {
  font-family: var(--font-sans);
  font-size: 16px;
  letter-spacing: -0.015em;
  color: var(--ink);
  font-weight: 500;
  margin-bottom: 12px;
}
.cs-method__findings { list-style: none; padding: 0; margin: 0; counter-reset: finding; }
.cs-method__findings li {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 12px;
  padding: 10px 0;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-2);
}
.cs-method__findings li::before {
  content: counter(finding, decimal-leading-zero);
  counter-increment: finding;
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--ink-4);
  padding-top: 2px;
}

/* MaxDiff */
.cs-maxdiff {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 48px;
  margin-top: 24px;
  border-top: 1px solid var(--line);
  padding-top: 24px;
  max-width: 720px;
}
@media (max-width: 809px) {
  .cs-maxdiff { grid-template-columns: 1fr; gap: 32px; }
}
.cs-maxdiff__col { padding: 0; }
.cs-maxdiff__label {
  font-family: var(--font-sans);
  font-size: 16px;
  letter-spacing: -0.015em;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--ink);
}
.cs-maxdiff__col--low .cs-maxdiff__label { color: var(--ink-4); }
.cs-maxdiff__list { list-style: none; padding: 0; margin: 0; }
.cs-maxdiff__list li {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 12px;
  padding: 10px 0;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink-2);
}
.cs-maxdiff__col--low .cs-maxdiff__list li { color: var(--ink-3); }
.cs-maxdiff__list li:first-child { border-top: 0; padding-top: 0; }
.cs-maxdiff__rank {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--ink-4);
  padding-top: 2px;
  font-variant-numeric: tabular-nums;
}

/* Selected items list (Priority matrix) */
.cs-selected {
  max-width: 720px;
  margin-top: 32px;
  padding-top: 0;
  border-top: 0;
}
.cs-selected__label {
  font-family: var(--font-sans);
  font-size: 11.5px;
  color: var(--ink-4);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  margin-bottom: 16px;
}
.cs-selected__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.cs-selected__list li {
  display: grid;
  grid-template-columns: 36px 1fr;
  align-items: baseline;
  gap: 8px;
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.005em;
  line-height: 1.45;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  border-bottom: 0;
  border-left: 0;
  border-right: 0;
  border-radius: 0;
  background: transparent;
}
.cs-selected__list li:last-child { border-bottom: 1px solid var(--line); }
.cs-selected__n {
  font-family: var(--font-mono, var(--font-sans));
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink-4);
  font-variant-numeric: tabular-nums;
}
.cs-quad {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 12px;
  margin-top: 8px;
  max-width: 720px;
}
@media (max-width: 809px) {
  .cs-quad { grid-template-columns: 1fr; }
}
.cs-quad__cell {
  padding: 22px 22px 26px;
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
}
.cs-quad__cell--hi {
  background: #fff;
  border-color: var(--ink);
  border-width: 1.5px;
  padding: 21.5px 21.5px 25.5px;
}
.cs-quad__tag {
  display: inline-block;
  align-self: flex-start;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin: 0;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
}
.cs-quad__cell--hi .cs-quad__tag {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}
.cs-quad__label {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 6px 0 8px;
}
.cs-quad__cell--hi .cs-quad__label { color: var(--ink); }
.cs-quad__list { list-style: none; padding: 0; margin: 0; }
.cs-quad__list li {
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-2);
  padding: 4px 0;
}
.cs-quad__cell--hi .cs-quad__list li { color: var(--ink-2); }

/* Impact stats */
.cs-page .cs-impact {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 40px;
  text-align: center;
  padding-top: 28px;
  margin-top: 12px;
  border-top: 0;
  border-bottom: 0;
}
@media (max-width: 809px) {
  .cs-page .cs-impact { grid-template-columns: 1fr; }
}
.cs-impact__stat .n {
  font-family: var(--font-sans);
  font-size: clamp(72px, 8vw, 96px);
  letter-spacing: -0.05em;
  line-height: 0.95;
  color: var(--metric);
  font-weight: 600;
  margin-bottom: 14px;
  font-variant-numeric: tabular-nums;
}
.cs-impact__stat .lbl-h {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 6px;
}
.cs-impact__stat .lbl-p {
  font-size: 13px;
  color: var(--ink-3);
  line-height: 1.5;
  margin: 0;
}

/* TL;DR challenge — problem stat bar */
.cs-tldr-problem {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-top: 24px;
  padding: 24px 30px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper-2);
}
.cs-tldr-problem__n {
  font-family: var(--font-sans);
  font-size: clamp(42px, 5vw, 60px);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  flex: 0 0 auto;
}
.cs-tldr-problem__l {
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink-2);
  margin: 0;
}
@media (max-width: 560px) {
  .cs-tldr-problem { flex-direction: column; align-items: flex-start; gap: 12px; }
}

/* TL;DR impact — bold stat blocks */
.cs-tldr-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 28px;
}
.cs-tldr-stat {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 30px 28px;
  background: var(--paper-2);
}
.cs-tldr-stat--hero { background: var(--ink); border-color: transparent; }
.cs-tldr-stat__n {
  font-family: var(--font-sans);
  font-size: clamp(42px, 5vw, 60px);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 0.95;
  color: var(--ink);
  margin: 0 0 14px;
  font-variant-numeric: tabular-nums;
}
.cs-tldr-stat--hero .cs-tldr-stat__n { color: var(--paper); }
.cs-tldr-stat__l {
  font-size: 14.5px;
  line-height: 1.4;
  color: var(--ink-2);
  margin: 0;
}
.cs-tldr-stat--hero .cs-tldr-stat__l { color: oklch(0.82 0.004 250); }
.cs-tldr-note {
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink-3);
  font-style: italic;
  margin: 18px 0 0;
  max-width: none;
}
@media (max-width: 809px) {
  .cs-tldr-stats { grid-template-columns: 1fr; }
}

/* Research at a glance — moderate stat row (research scope/findings, not impact) */
.cs-glance {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  text-align: left;
  margin: 0;
}
.cs-glance__stat {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 30px 28px;
  background: var(--paper-2);
}
.cs-glance__n {
  font-family: var(--font-sans);
  font-size: clamp(42px, 5vw, 60px);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 0.95;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  margin-bottom: 14px;
}
.cs-glance__l {
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.4;
}
@media (max-width: 809px) {
  .cs-glance { grid-template-columns: 1fr; gap: 14px; }
}

/* =========================================================
   DESIGN SECTION — minimalist, Apple-style
   ========================================================= */
.cs-design { max-width: 100%; }

/* Intro: barriers + directions, two-up */
.cs-design-intro {
  margin-bottom: 56px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--line);
}
.cs-design-intro__lede {
  font-size: 22px;
  line-height: 1.45;
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 0 0 48px;
  max-width: none;
  text-wrap: pretty;
}
.cs-design-intro__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 64px;
}
@media (max-width: 1199px) {
  .cs-design-intro__grid { grid-template-columns: 1fr; gap: 40px; }
}

.cs-design-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
}
.cs-design-list li {
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink-2);
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.cs-design-list li:last-child { border-bottom: 0; }
.cs-design-list--num { counter-reset: dlist; }
.cs-design-list--num li {
  counter-increment: dlist;
  padding-left: 36px;
  position: relative;
}
.cs-design-list--num li::before {
  content: counter(dlist, decimal-leading-zero);
  position: absolute; left: 0; top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-4);
  letter-spacing: 0.06em;
}
.cs-design-list--inline { margin: 12px 0 24px; }
.cs-design-list--inline li {
  padding: 6px 0 6px 20px;
  border: 0;
  position: relative;
  color: var(--ink-2);
}
.cs-design-list--inline li::before {
  content: '';
  position: absolute; left: 0; top: 17px;
  width: 10px; height: 1px;
  background: var(--ink-4);
}

/* Decision blocks */
.cs-decision {
  padding-top: 56px;
  margin-top: 56px;
  border-top: 1px solid var(--line);
}
.cs-decision:first-of-type {
  padding-top: 0;
  margin-top: 0;
  border-top: 0;
}
.cs-decision__eyebrow {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--ink-4);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
  margin-bottom: 16px;
}
.cs-decision__h {
  font-family: var(--font-sans);
  font-size: clamp(28px, 3.2vw, 36px);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.08;
  color: var(--ink);
  margin: 0 0 64px;
  text-wrap: balance;
}

/* Insight + Decision row */
.cs-decision__phases {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 48px;
  margin-bottom: 64px;
  padding-bottom: 64px;
  border-bottom: 1px solid var(--line);
}
@media (max-width: 1199px) {
  .cs-decision__phases { grid-template-columns: 1fr; gap: 32px; padding-bottom: 48px; margin-bottom: 48px; }
}
.cs-decision__label {
  font-family: var(--font-sans);
  font-size: 22px;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--ink);
  font-weight: 600;
  margin-bottom: 24px;
  text-transform: none;
}
.cs-decision__copy {
  font-size: 18px;
  line-height: 1.55;
  color: var(--ink);
  font-weight: 400;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
  max-width: none;
}
.cs-decision__copy:last-child { margin-bottom: 0; }
/* Inside the two-up Insight + Decision row, copy hugs its column */
.cs-decision__phases .cs-decision__copy { max-width: none; }

/* Solution */
.cs-decision__solution { margin-bottom: 56px; }
.cs-decision__intro {
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0 0 48px;
  max-width: none;
}
.cs-decision__coda {
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink-3);
  margin: 48px 0 0;
  font-style: italic;
  max-width: 720px;
}

/* Features: alternating text ↔ image rows (Apple product-page rhythm) */
.cs-features {
  display: flex;
  flex-direction: column;
  gap: 88px;
}
.cs-feature {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 64px;
  align-items: center;
}
.cs-feature:nth-child(even) .cs-feature__body { order: 2; }
.cs-feature:nth-child(even) .cs-feature__media { order: 1; }
@media (max-width: 1199px) {
  .cs-features { gap: 56px; }
  .cs-feature { grid-template-columns: 1fr; gap: 24px; }
  .cs-feature:nth-child(even) .cs-feature__body,
  .cs-feature:nth-child(even) .cs-feature__media { order: initial; }
}
.cs-feature__eyebrow {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--ink);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 14px;
}
.cs-feature__h {
  font-family: var(--font-sans);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.15;
  color: var(--ink);
  margin: 0 0 14px;
  text-wrap: balance;
}
.cs-feature__copy {
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0;
  max-width: 480px;
}

/* Figure cell (placeholder or image), used by features + GIF */
.cs-figure-cell {
  margin: 0;
  overflow: visible;
  background: transparent;
  border-radius: 0;
  border: 0;
}
.cs-figure-cell img,
.cs-figure-cell video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  background: transparent;
  filter:
    drop-shadow(0 1px 1px rgba(17, 17, 17, 0.06))
    drop-shadow(0 8px 16px rgba(17, 17, 17, 0.08))
    drop-shadow(0 24px 48px rgba(17, 17, 17, 0.10));
}
/* Placeholder state keeps the soft card treatment so empty slots remain visible */
.cs-figure-cell:has(.placeholder) {
  background: var(--paper-2);
  border-radius: 16px;
  border: 1px solid var(--line);
  overflow: hidden;
}
.cs-figure-cell .placeholder {
  width: 100%;
  height: 100%;
}

/* Single-phone media cells — sized to read at a comfortable, consistent width */
.cs-feature__media:not(.cs-feature__media--pair) {
  aspect-ratio: 4 / 5;
  width: 100%;
  max-width: 347px;
  justify-self: center;
}

/* Two-up pair (Camera scan): side-by-side phone screens fill the column */
/* Two-up pair (Camera scan): side-by-side phone screens with a slight overlap
   so each phone reads at roughly the same on-screen width as the single-phone rows. */
.cs-feature__media--pair {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  width: 100%;
  margin-inline: auto;
  position: relative;
}
.cs-feature__media--pair .cs-figure-cell {
  width: 61.5%;
  aspect-ratio: 437 / 889;
  min-width: 0;
}
.cs-feature__media--pair .cs-figure-cell:nth-child(1) { z-index: 1; }
.cs-feature__media--pair .cs-figure-cell:nth-child(2) {
  z-index: 2;
  margin-top: 32px;
}
@media (max-width: 809px) {
  .cs-feature__media--pair { flex-direction: column; gap: 16px; }
  .cs-feature__media--pair .cs-figure-cell { width: 100%; margin-top: 0; }
}

/* ── Gallery layout — phone screens in a row, explanations underneath ── */
.cs-gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-rows: auto auto;
  gap: 28px 16px;
  align-items: start;
  margin-top: 8px;
  max-width: 1040px;
  margin-inline: auto;
}
/* 2×2 variant — two screens per row */
.cs-gallery--2col {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-rows: repeat(4, auto);
  gap: 44px 40px;
  max-width: 760px;
}
.cs-gallery--2col .cs-gallery__media { max-width: 340px; }
.cs-gallery--2col .cs-gallery__media--phoneframe { max-width: 340px; }
/* Extra separation above the bottom row of screens */
.cs-gallery--2col .cs-gallery__item:nth-child(n+3) .cs-gallery__media { margin-top: 52px; }
/* 4-up variant — one row of four screens */
.cs-gallery--4col {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  grid-template-rows: auto auto;
  gap: 28px 22px;
}
.cs-gallery--4col .cs-gallery__media { max-width: 240px; }
.cs-gallery--4col .cs-gallery__body { max-width: 240px; }
.cs-gallery--4col .cs-gallery__body .cs-feature__h { font-size: 18px; }
.cs-gallery--4col .cs-gallery__body .cs-feature__copy { font-size: 13.5px; }
.cs-gallery--4col .cs-feature__eyebrow { margin-bottom: 8px; }
@media (max-width: 899px) {
  .cs-gallery--4col { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; grid-template-rows: none !important; grid-auto-rows: auto; gap: 44px 24px; }
}

/* Scrollable screen — real device frame (PNG) over a scrolling inner screen */
.cs-gallery__media--phoneframe {
  position: relative;
  width: 100%;
  max-width: 240px;
  margin: 0 auto;
  align-self: start;
  aspect-ratio: 874 / 1778;
  filter:
    drop-shadow(0 1px 1px rgba(17, 17, 17, 0.06))
    drop-shadow(0 8px 16px rgba(17, 17, 17, 0.08))
    drop-shadow(0 24px 48px rgba(17, 17, 17, 0.10));
}
.cs-phone-frame__screen {
  position: absolute;
  left: 5.49%;
  top: 2.31%;
  width: 89.02%;
  height: 95.28%;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  border-radius: 7%;
  background: #fff;
  scrollbar-width: none;
  z-index: 1;
}
.cs-phone-frame__screen::-webkit-scrollbar { width: 0; height: 0; }
.cs-phone-frame__screen img { display: block; width: 100%; height: auto; }
.cs-phone-frame__bezel {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 2;
}
/* Soft fade where the scrolling content meets the bottom of the screen */
.cs-phone-frame__fade {
  position: absolute;
  left: 5.49%;
  right: 5.49%;
  bottom: 2.31%;
  height: 34px;
  pointer-events: none;
  z-index: 2;
  border-radius: 0 0 7% 7%;
  background: linear-gradient(to bottom, rgba(255,255,255,0), rgba(255,255,255,0.85));
}
.cs-gallery__scrollhint {
  position: absolute;
  left: 50%;
  bottom: 16px;
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 11px 5px 9px;
  border-radius: 999px;
  background: rgba(17, 24, 28, 0.74);
  color: #fff;
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.01em;
  backdrop-filter: blur(4px);
  pointer-events: none;
  z-index: 3;
  animation: cs-scrollnudge 2.4s ease-in-out infinite;
}
@keyframes cs-scrollnudge {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 3px); }
}
@media (prefers-reduced-motion: reduce) {
  .cs-gallery__scrollhint { animation: none; }
}
.cs-gallery__zoombtn {
  position: absolute;
  top: 9%;
  right: 9%;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: rgba(17, 24, 28, 0.62);
  color: #fff;
  cursor: zoom-in;
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity 0.18s ease;
  z-index: 3;
}
.cs-gallery__media--phoneframe:hover .cs-gallery__zoombtn { opacity: 1; }
/* Zoom icons hidden site-wide — cursor remains the affordance */
.cs-gallery__zoom, .cs-gallery__zoombtn { display: none !important; }
.cs-gallery__item {
  display: grid;
  grid-template-rows: subgrid;
  grid-row: span 2;
  min-width: 0;
}
.cs-gallery__media {
  width: 100%;
  max-width: 340px;
  margin: 0 auto;
  align-self: start;
}
.cs-gallery__media .cs-figure-cell { width: 100%; height: 100%; }
.cs-gallery__zoom {
  position: absolute;
  bottom: 14px;
  right: 14px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(17, 24, 28, 0.62);
  color: #fff;
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity 0.18s ease, transform 0.18s ease;
  transform: translateY(4px);
  pointer-events: none;
}
.cs-gallery__media:hover .cs-gallery__zoom {
  opacity: 1;
  transform: translateY(0);
}
.cs-gallery__body {
  text-align: center;
  padding-top: 8px;
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
}
.cs-gallery__body .cs-feature__h { font-size: 22px; }
.cs-gallery__body .cs-feature__copy { font-size: 15px; }
@media (max-width: 899px) {
  .cs-gallery { grid-template-columns: 1fr; grid-auto-rows: auto; grid-template-rows: none; gap: 56px; justify-items: center; }
  .cs-gallery__item { display: flex; flex-direction: column; max-width: 380px; }
  .cs-gallery__media { max-width: 300px; margin-bottom: 24px; }
}

/* ── Tabbed screen viewer (replaces stacked phone galleries) ──
   One screen + its explanation per tab. Every screen renders at the same
   fixed WIDTH (set inline on .cs-screens__media) and grows taller as needed. */
.cs-screens { margin-top: 8px; }
.cs-screens__tabs {
  display: flex; flex-wrap: nowrap; gap: 8px;
  width: fit-content; max-width: 100%; margin: 0 auto 40px;
  background: var(--paper-2); border: 1px solid var(--line);
  border-radius: 12px; padding: 6px;
  overflow-x: auto; scrollbar-width: none;
}
.cs-screens__tabs::-webkit-scrollbar { display: none; }
.cs-screens__tab {
  font-family: var(--font-sans); font-size: 14px; font-weight: 500;
  padding: 11px 24px; border: 0; background: transparent; color: var(--ink-3);
  border-radius: 8px; cursor: pointer; white-space: nowrap; flex: 0 0 auto;
  transition: background var(--t-fast) var(--ease-out), color var(--t-fast) var(--ease-out);
}
.cs-screens__tab--active { background: var(--ink); color: var(--bg); }
.cs-screens__tab:hover:not(.cs-screens__tab--active) { color: var(--ink); }
.cs-screens__panel {
  display: grid; grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
  gap: 56px; align-items: center; max-width: 820px; margin: 0 auto;
}
.cs-screens__media { margin: 0 auto; cursor: zoom-in; }
.cs-screens__media .cs-figure-cell { width: 100%; height: 100%; }
.cs-screens__body { max-width: 420px; }
.cs-screens__body .cs-feature__h { font-size: 22px; }
.cs-screens__body .cs-feature__copy { font-size: 15px; }
@media (max-width: 899px) {
  .cs-screens__panel { grid-template-columns: 1fr; gap: 28px; justify-items: center; text-align: center; }
  .cs-screens__body { padding-top: 0; }
}

/* Problem — reviews image centered below the statement content */
.cs-page .cs-figure.cs-problem-belowfig {
  margin: 44px auto 0;
  max-width: 620px;
  width: 100%;
}
.cs-problem-belowfig .cs-figure__img {
  border-radius: 10px;
  border: 1px solid var(--line);
}
.cs-problem-belowfig .cs-figure__cap { text-align: center; }

/* Reflection — "What I learned" + "What I'd explore next" side by side */
.cs-reflect-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin: 32px 0 24px;
}
@media (max-width: 899px) {
  .cs-reflect-cols { grid-template-columns: 1fr; gap: 28px; }
}

/* MyPlate: wide-media feature row — image gets more grid weight than text */
.cs-feature--wide-media {
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.7fr) !important;
  gap: 56px;
}
@media (max-width: 1199px) {
  .cs-feature--wide-media { grid-template-columns: 1fr !important; gap: 24px; }
}
.cs-decision__gif {
  margin: 56px auto 0;
  aspect-ratio: 534 / 1080;
  width: 330px;
  max-width: 100%;
  background: transparent !important;
}
.cs-decision__gif video {
  /* Legacy crop, only applied when chroma-key is not in use */
  background: transparent;
}
/* Chroma-key video: hidden <video> drives a WebGL <canvas> which is what we render */
.cs-chromakey {
  position: relative;
  width: 100%;
  height: 100%;
  background: transparent;
}
.cs-chromakey video {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
  clip-path: none !important;
}
.cs-chromakey canvas {
  display: block;
  width: 100%;
  height: 100%;
  background: transparent;
}
@media (max-width: 1199px) {
  .cs-decision__gif { max-width: 347px; }
}
@media (max-width: 809px) {
  .cs-decision__gif { max-width: 90%; }
}

/* Sitemap detail crop inside a decision — wide or portrait, centered + capped */
.cs-decision__sitemap {
  margin: 48px auto 8px;
  max-width: 680px;
  text-align: center;
}
.cs-page .cs-decision__sitemap img {
  width: auto;
  max-width: 100%;
  max-height: 560px;
  height: auto;
  margin: 0 auto;
}

/* ─── Split decision: narrative + sticky sitemap, side by side ─── */
.cs-decision__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
  gap: 56px;
  align-items: start;
}
@media (max-width: 1199px) {
  .cs-decision__grid { grid-template-columns: 1fr; gap: 40px; }
}
.cs-decision__media {
  position: sticky;
  top: 96px;
}
@media (max-width: 1199px) {
  .cs-decision__media { position: static; }
}
/* Tighten the narrative rhythm inside the narrower text column */
.cs-decision--split .cs-decision__phases {
  grid-template-columns: 1fr;
  gap: 28px;
  margin-bottom: 36px;
  padding-bottom: 36px;
}
.cs-decision--split .cs-decision__solution { margin-bottom: 36px; }
.cs-decision--split .cs-decision__intro { margin-bottom: 0; }
.cs-decision--split .cs-decision__outcome { padding-top: 36px; }
.cs-decision--split .cs-decision__copy,
.cs-decision--split .cs-decision__intro { max-width: none; }
.cs-decision--split .cs-decision__h { margin-bottom: 48px; }
/* The sitemap fills its column and drops the auto-centering margin */
.cs-decision--split .cs-decision__media .cs-decision__sitemap {
  margin: 0;
  max-width: 100%;
  width: 100%;
}
.cs-page .cs-decision--split .cs-decision__media .cs-decision__sitemap img {
  max-height: 72vh;
}

/* ─── Back to top button (used on case studies + home) ───────── */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 60;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--bg);
  border: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity .22s var(--ease), transform .22s var(--ease), background .15s var(--ease);
  box-shadow: 0 6px 18px rgba(0,0,0,.18);
}
.back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.back-to-top:hover {
  background: oklch(0.22 0 0);
}
/* On tablet/mobile, lift it above the sticky bottom TOC */
@media (max-width: 1199px) {
  .back-to-top {
    bottom: 80px !important;
    right: 16px;
  }
}
.cs-bottom-toc {
  position: fixed;
  inset: auto 0 0 0;
  display: none;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-top: .5px solid var(--line);
}
@media (max-width: 1199px) {
  .cs-bottom-toc { display: block; }
  /* Don't let the fixed bar overlap the page bottom */
  .cs-page main { padding-bottom: 64px; }
}
.cs-bottom-toc__bar {
  height: 2px;
  background: var(--line);
  position: relative;
  overflow: hidden;
}
.cs-bottom-toc__bar::after {
  content: '';
  position: absolute;
  inset: 0 auto 0 0;
  width: calc(var(--p, 0) * 100%);
  background: var(--ink);
  transition: width .15s linear;
}
.cs-bottom-toc__trigger {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  background: transparent;
  border: 0;
  padding: 14px clamp(20px, 5vw, 32px);
  text-align: left;
  cursor: pointer;
  color: var(--ink);
}
.cs-bottom-toc__num {
  display: none;
}
.cs-bottom-toc__label {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.012em;
  color: var(--ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.cs-bottom-toc__caret {
  font-size: 14px;
  color: var(--ink-3);
}

/* Sheet overlay */
.cs-bottom-toc__sheet {
  position: fixed;
  inset: 0;
  z-index: 49;
  background: color-mix(in srgb, #000 32%, transparent);
  opacity: 0;
  pointer-events: none;
  transition: opacity .22s var(--ease);
  display: flex;
  align-items: flex-end;
  justify-content: stretch;
}
.cs-bottom-toc__sheet.is-open {
  opacity: 1;
  pointer-events: auto;
}
.cs-bottom-toc__panel {
  width: 100%;
  max-height: 80vh;
  background: var(--bg);
  border-top: .5px solid var(--line);
  border-radius: 18px 18px 0 0;
  padding: 20px clamp(20px, 5vw, 32px) calc(96px + env(safe-area-inset-bottom, 0px));
  transform: translateY(16px);
  transition: transform .26s var(--ease);
  overflow-y: auto;
  box-shadow: 0 -20px 60px -20px rgba(0,0,0,.18);
}
.cs-bottom-toc__sheet.is-open .cs-bottom-toc__panel {
  transform: translateY(0);
}
.cs-bottom-toc__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 16px;
  margin-bottom: 8px;
  border-bottom: .5px solid var(--line);
}
.cs-bottom-toc__title {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.cs-bottom-toc__close {
  background: transparent;
  border: 0;
  font-size: 28px;
  line-height: 1;
  color: var(--ink);
  cursor: pointer;
  padding: 4px 8px;
  margin: -4px -8px;
}
.cs-bottom-toc__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
}
.cs-bottom-toc__list > li {
  border-bottom: .5px solid var(--line);
}
.cs-bottom-toc__list > li:last-child {
  border-bottom: 0;
}
.cs-bottom-toc__list button {
  display: flex;
  align-items: baseline;
  gap: 14px;
  width: 100%;
  background: transparent;
  border: 0;
  padding: 14px 0;
  font-family: var(--font-sans);
  text-align: left;
  cursor: pointer;
  color: var(--ink);
}
.cs-bottom-toc__rownum {
  display: none;
}
.cs-bottom-toc__rowlabel {
  font-size: 17px;
  font-weight: 500;
  letter-spacing: -0.015em;
}
.cs-bottom-toc__list > li.is-active .cs-bottom-toc__rowlabel,
.cs-bottom-toc__list > li.is-active .cs-bottom-toc__rownum {
  color: var(--ink);
}
.cs-bottom-toc__list > li:not(.is-active) .cs-bottom-toc__rowlabel,
.cs-bottom-toc__list > li:not(.is-active) .cs-bottom-toc__rownum {
  color: var(--ink-3);
}
.cs-bottom-toc__sublist {
  list-style: none;
  padding: 0 0 12px 0;
  margin: -6px 0 0;
  display: flex;
  flex-direction: column;
}
.cs-bottom-toc__sublist button {
  padding: 8px 0;
  font-size: 14.5px;
  color: var(--ink-3);
}
.cs-bottom-toc__sublist li.is-active button {
  color: var(--ink);
  font-weight: 500;
}

/* Steps (numbered list) */
.cs-steps {
  list-style: none;
  padding: 0;
  margin: 8px 0 0;
}
.cs-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 24px;
  padding: 32px 0;
  border-top: 1px solid var(--line);
  align-items: baseline;
}
.cs-step:last-child { border-bottom: 1px solid var(--line); }
.cs-step__n {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-4);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}
.cs-step__h {
  font-family: var(--font-sans);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--ink);
  margin: 0 0 6px;
}
.cs-step__body {
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink-3);
  margin: 0;
  max-width: 560px;
}

/* Outcome */
.cs-decision__outcome {
  padding-top: 56px;
  border-top: 1px solid var(--line);
}

/* ── Compact decision layout — all writeup in a left rail, screens boxed on
   the right at their natural (uncropped) size. Opt-in via design.layout ===
   'compact' (myplate). Each decision becomes a self-contained card. ── */
.cs-design--compact .cs-decision {
  padding: clamp(24px, 3.4vw, 48px);
  margin-top: 28px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--paper-2);
}
.cs-design--compact .cs-decision:first-of-type { margin-top: 0; }
.cs-design--compact .cs-decision__h { margin-bottom: 36px; }
.cs-design--compact .cs-decision__layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 52px;
  align-items: start;
}
.cs-design--compact .cs-decision__phases {
  grid-template-columns: 1fr;
  gap: 40px;
  margin-bottom: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}
.cs-design--compact .cs-decision__outcome { padding-top: 40px; }
.cs-design--compact .cs-decision__solution { margin: 0 0 40px; padding-bottom: 40px; border-bottom: 1px solid var(--line); }
.cs-design--compact .cs-decision__intro { margin-bottom: 0; max-width: none; }
.cs-design--compact .cs-decision__copy,
.cs-design--compact .cs-decision__intro { font-size: 16px; }
.cs-design--compact .cs-decision__coda { margin-top: 16px; }

/* Right column — screens at natural size, kept in view while the rail scrolls */
.cs-design--compact .cs-decision__visual { position: sticky; top: 24px; }
.cs-design--compact .cs-decision__media-stack { display: flex; flex-direction: column; align-items: center; }
.cs-design--compact .cs-decision__count {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--ink-4);
  text-align: center;
  margin: 0 0 14px;
}
/* Compact right column mirrors the layout-test: short tab + caption only (no h / eyebrow heading) */
.cs-design--compact .cs-screens__body .cs-feature__eyebrow,
.cs-design--compact .cs-screens__body .cs-feature__h { display: none; }
.cs-design--compact .cs-screens { width: 100%; }
.cs-design--compact .cs-screens__tabs { flex-wrap: wrap; justify-content: center; margin: 0 auto 22px; }
.cs-design--compact .cs-screens__panel {
  grid-template-columns: 1fr;
  gap: 18px;
  justify-items: center;
  text-align: center;
  max-width: none;
}
.cs-design--compact .cs-screens__body { max-width: 340px; }
.cs-design--compact .cs-decision__gif { margin: 0 auto; max-width: 300px; }
@media (max-width: 767px) {
  .cs-design--compact .cs-decision__layout { grid-template-columns: 1fr; gap: 36px; }
  .cs-design--compact .cs-decision__visual { position: static; }
}

/* Closing */
.cs-design-closing {
  margin: 64px 0 0;
  padding-top: 48px;
  border-top: 1px solid var(--line);
  font-size: clamp(20px, 1.8vw, 24px);
  line-height: 1.4;
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -0.02em;
  max-width: none;
  text-wrap: pretty;
}

/* ── Zoom affordance — cursor only (badge removed) ── */
.cs-image, .cs-banner, .cs-problem-split__fig, .cs-feature__media, .cs-decision__sitemap {
  position: relative;
  cursor: zoom-in;
}
.cs-placeholder {
  max-width: 680px;
  padding: 24px 28px;
  border: 1px dashed var(--line-strong);
  background: var(--paper-2);
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-3);
}
.cs-placeholder strong { color: var(--ink); font-weight: 500; }

/* Next case */
.cs-next {
  border-top: 1px solid var(--line);
  margin: 64px auto 0;
  padding: 56px var(--pad-page-x) 200px;
  max-width: var(--maxw);
  text-align: center;
}
.cs-next a {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  border: 0;
  color: var(--ink);
}
.cs-next__title {
  font-family: var(--font-sans);
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.05;
  letter-spacing: -0.035em;
  font-weight: 600;
  transition: color var(--t-fast) var(--ease-out);
}
.cs-next a:hover .cs-next__title { color: var(--ink-3); }

/* =========================================================
   BEFORE / AFTER comparison (Design intro)
   ========================================================= */
.cs-ba { margin-top: 8px; }
.cs-ba__intro {
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0 0 40px;
  max-width: 680px;
}
.cs-ba__rows { display: flex; flex-direction: column; gap: 72px; }
.cs-ba__area {
  font-family: var(--font-sans);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 20px;
}
.cs-ba__pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
  max-width: 720px;
}
.cs-ba__tag {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 14px;
}
.cs-ba__tag--after { color: var(--ink); }
.cs-ba__media {
  width: 100%;
  margin: 0;
}
.cs-ba__media .cs-figure-cell { width: 100%; height: 100%; }
.cs-ba__absence {
  width: 100%;
  max-width: none;
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 10px;
  padding: 28px;
  background: var(--paper-2);
  border: 1px dashed var(--line-strong);
  border-radius: 16px;
}
.cs-ba__absence-mark {
  font-size: 38px;
  line-height: 1;
  color: var(--ink-5);
  font-weight: 300;
}
.cs-ba__absence-h {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--ink);
}
.cs-ba__absence-note {
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-3);
  max-width: 220px;
}
.cs-ba__caption {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 22px;
  max-width: 720px;
}
.cs-ba__problem,
.cs-ba__fix {
  font-size: 14px;
  line-height: 1.55;
  padding-left: 16px;
  position: relative;
}
.cs-ba__problem { color: var(--ink-3); }
.cs-ba__fix { color: var(--ink); font-weight: 500; }
.cs-ba__problem::before,
.cs-ba__fix::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 1px;
  background: var(--ink-4);
}
@media (max-width: 809px) {
  .cs-ba__pair { gap: 14px; }
  .cs-ba__caption { gap: 14px; }
}

/* Before-only strip — original app as a compact 3-up row (Option 1) */
.cs-ba__strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 860px;
  align-items: start;
}
.cs-ba__scell .cs-ba__area { margin-bottom: 16px; }
.cs-ba__scell .cs-ba__media,
.cs-ba__scell .cs-ba__absence { margin: 0; }
.cs-ba__scell-note {
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-3);
  padding-left: 16px;
  position: relative;
  margin: 18px 0 0;
}
.cs-ba__scell-note::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 1px;
  background: var(--ink-4);
}
@media (max-width: 760px) {
  .cs-ba__strip { grid-template-columns: 1fr; gap: 40px; max-width: 360px; }
}

/* =========================================================
   IMPACT — baseline \u2192 target table
   ========================================================= */
.cs-targets {
  margin: 40px 0 8px;
  max-width: 880px;
}
.cs-targets__intro {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-3);
  font-style: italic;
  margin: 8px 0 22px;
  max-width: 860px;
}
.cs-targets__table { border-top: 1px solid var(--line); }
.cs-targets__row {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.cs-targets__row--head { padding: 10px 0; }
.cs-targets__row--head span {
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-4);
  font-weight: 500;
}
.cs-targets__metric { display: flex; flex-direction: column; gap: 5px; }
.cs-targets__name {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.cs-targets__note {
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-3);
}
.cs-targets__cell { display: flex; flex-direction: column; gap: 4px; }
.cs-targets__val {
  font-family: var(--font-sans);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.cs-targets__val--base { color: var(--ink-3); }
.cs-targets__val--target { color: var(--metric, var(--ink)); }
.cs-targets__sub {
  font-size: 12px;
  line-height: 1.4;
  color: var(--ink-4);
}
@media (max-width: 809px) {
  .cs-targets__row { grid-template-columns: 1fr; gap: 10px; }
  .cs-targets__row--head { display: none; }
  .cs-targets__cell { flex-direction: row; align-items: baseline; gap: 10px; }
}

/* =========================================================
   VALIDATION — concept testing section
   ========================================================= */
.cs-val__eyebrow {
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-4);
  font-weight: 500;
  margin: 0 0 10px;
}
.cs-val__h {
  font-size: clamp(24px, 2.6vw, 30px);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin: 0 0 18px;
}
.cs-val__intro {
  font-size: 18px;
  line-height: 1.6;
  color: var(--ink-2);
  max-width: none;
  margin: 0;
}

.cs-val__method {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  margin: 32px 0 0;
}
.cs-val__method-cell { background: var(--paper); padding: 18px 20px; }
.cs-val__method-k { font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-4); font-weight: 600; margin: 0 0 6px; }
.cs-val__method-v { font-size: 15px; font-weight: 500; margin: 0; color: var(--ink); }

.cs-val__metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 34px 0 0;
}
.cs-val__metric { border: 1px solid var(--line); border-radius: 14px; padding: 22px 22px 18px; background: var(--paper-2); }
.cs-val__metric--hero { background: var(--ink); border-color: transparent; }
.cs-val__metric-num { font-size: 36px; font-weight: 600; letter-spacing: -0.03em; line-height: 1; margin: 0 0 8px; color: var(--ink); }
.cs-val__metric--hero .cs-val__metric-num { color: var(--paper); }
.cs-val__metric-num span { font-size: 16px; color: var(--ink-4); font-weight: 500; }
.cs-val__metric--hero .cs-val__metric-num span { color: var(--paper); opacity: 0.55; }
.cs-val__metric-label { font-size: 13.5px; font-weight: 600; margin: 0 0 5px; color: var(--ink); }
.cs-val__metric--hero .cs-val__metric-label { color: var(--paper); }
.cs-val__metric-sub { font-size: 12.5px; line-height: 1.45; color: var(--ink-3); margin: 0; }
.cs-val__metric--hero .cs-val__metric-sub { color: oklch(0.78 0.004 250); }

.cs-val__findings { margin: 44px 0 0; display: grid; gap: 14px; }
.cs-val__finding {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px 26px;
  background: var(--paper);
  display: grid;
  grid-template-columns: 128px 1fr;
  gap: 24px;
  align-items: start;
}
.cs-val__tag { font-size: 11px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; padding: 5px 11px; border-radius: 20px; justify-self: start; white-space: nowrap; }
.cs-val__tag--val { background: var(--ink); color: var(--paper); }
.cs-val__tag--fix { background: var(--paper-3); color: var(--ink-2); border: 1px solid var(--line-2); }
.cs-val__area { font-size: 11px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-4); margin: 8px 0 0; }
.cs-val__finding-body h4 { font-size: 17px; font-weight: 600; letter-spacing: -0.01em; margin: 0 0 7px; }
.cs-val__finding-body p { font-size: 15px; line-height: 1.6; color: var(--ink-2); margin: 0; }
.cs-val__finding-body p strong { color: var(--ink); font-weight: 600; }
.cs-val__quote { font-size: 14px; line-height: 1.5; color: var(--ink-3); font-style: italic; margin: 10px 0 0 !important; padding-left: 14px; border-left: 2px solid var(--line-2); }
.cs-val__quote::before { content: "\201C"; }
.cs-val__quote::after { content: "\201D"; }

.cs-val__takeaway {
  margin: 44px 0 0;
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink-2);
  max-width: none;
  padding-top: 30px;
  border-top: 1px solid var(--line);
}
.cs-val__takeaway strong { color: var(--ink); font-weight: 600; }

@media (max-width: 809px) {
  .cs-val__method, .cs-val__metrics { grid-template-columns: 1fr 1fr; }
  .cs-val__finding { grid-template-columns: 1fr; gap: 12px; }
}


/* ── cross-links to other case studies (end of case study) ── */
.morecs { max-width: var(--maxw); margin: 0 auto; padding: 72px clamp(24px,5vw,56px) 8px; border-top: 1px solid var(--line); }
.morecs__label { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-4); margin: 0 0 22px; }
.morecs__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.morecs__card { display: flex; flex-direction: column; gap: 7px; padding: 26px 28px; border: 1px solid var(--line); border-radius: 14px; text-decoration: none; background: var(--bg); transition: border-color .15s var(--ease-out), transform .15s var(--ease-out), box-shadow .15s var(--ease-out); }
.morecs__card:hover { border-color: var(--line-strong); transform: translateY(-2px); box-shadow: 0 16px 40px -24px rgba(15,30,55,0.35); }
.morecs__eyebrow { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.05em; text-transform: uppercase; color: var(--ink-4); }
.morecs__title { font-family: var(--font-sans); font-size: 22px; font-weight: 600; letter-spacing: -0.02em; color: var(--ink); line-height: 1.15; }
.morecs__desc { font-size: 14.5px; line-height: 1.5; color: var(--ink-3); margin: 0; }
.morecs__cta { margin-top: 8px; font-size: 14px; font-weight: 500; color: var(--ink-3); display: inline-flex; align-items: center; gap: 8px; }
.morecs__card:hover .morecs__cta { color: var(--ink); }
.morecs__cta .arr { transition: transform .15s var(--ease-out); }
.morecs__card:hover .morecs__cta .arr { transform: translateX(4px); }
@media (max-width: 720px){ .morecs__grid { grid-template-columns: 1fr; } }