/* ================================================================
   CASE STUDY — Light Theme
================================================================ */

/* ================================================================
   HERO
================================================================ */
.cs-hero {
  padding: 8rem 4rem 5rem;
  border-bottom: 1px solid var(--border);
  max-width: var(--max-w);
  margin: 0 auto;
}

.cs-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4rem;
}

.cs-back {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.25s, gap 0.3s;
}
.cs-back:hover { color: var(--accent); gap: 0.75rem; }

.cs-counter {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: var(--text-tertiary);
}

.cs-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.cs-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.75rem, 6.5vw, 5.75rem);
  line-height: 1.0;
  letter-spacing: -0.025em;
  margin-bottom: 0.5rem;
}

.cs-hero__subtitle-label {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 300;
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  display: block;
}

.cs-hero__roles {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

/* ================================================================
   CONTENTS
================================================================ */
.cs-toc {
  padding: 2.5rem 4rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-alt);
}

.cs-toc__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  gap: 3rem;
  flex-wrap: wrap;
}

.cs-toc__label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  flex-shrink: 0;
}

.cs-toc__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 2rem;
  list-style: none;
}

.cs-toc__links a {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  text-transform: uppercase;
  border-bottom: 1px solid transparent;
  transition: color 0.25s, border-color 0.25s;
  padding-bottom: 1px;
}
.cs-toc__links a:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* ================================================================
   STATS BAR
================================================================ */
.cs-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--border);
}

.cs-stat {
  padding: 3rem 4rem;
  border-right: 1px solid var(--border);
}
.cs-stat:last-child { border-right: none; }

.cs-stat__num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 300;
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 0.625rem;
}

.cs-stat__label {
  font-size: 0.84375rem;
  color: var(--text-secondary);
  line-height: 1.55;
  max-width: 200px;
}

/* ================================================================
   CONTENT BODY
================================================================ */
.cs-body {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 4rem;
}

.cs-body--wide {
  max-width: var(--max-w);
  padding: 0 4rem;
  margin: 0 auto;
}

.cs-section {
  padding: 5rem 0;
  border-bottom: 1px solid var(--border);
}

.cs-section--full {
  padding: 5rem 4rem;
  border-bottom: 1px solid var(--border);
  max-width: 100%;
}

.cs-phase {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  margin-bottom: 2rem;
}

.cs-phase__num {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  background: var(--accent-light);
  padding: 0.25rem 0.6rem;
}

.cs-phase__name {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.cs-heading {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.65rem, 3vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin-bottom: 1.25rem;
}

.cs-lead {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 300;
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 2.5rem;
}

.cs-text p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.875;
  margin-bottom: 1.375rem;
}
.cs-text p:last-child { margin-bottom: 0; }

/* ================================================================
   SURVEY INSIGHTS / DATA
================================================================ */
.cs-survey-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  background: var(--border);
  margin: 2.5rem 0;
}

.cs-survey-item {
  background: var(--bg);
  padding: 1.875rem 2rem;
  transition: background 0.25s;
}
.cs-survey-item:hover { background: var(--bg-alt); }

.cs-survey-item__q {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
  margin-bottom: 0.75rem;
  display: block;
}

.cs-survey-item__finding {
  font-size: 0.9375rem;
  color: var(--text-primary);
  line-height: 1.6;
  font-weight: 400;
}

.cs-survey-item__stat {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 300;
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 0.375rem;
  display: block;
}

/* ================================================================
   DEMOGRAPHIC ROW
================================================================ */
.cs-demo-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: var(--border);
  margin: 2.5rem 0;
}

.cs-demo-card {
  background: var(--bg);
  padding: 2rem;
}

.cs-demo-card__label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  display: block;
  margin-bottom: 0.875rem;
}

.cs-demo-card__value {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 300;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 0.375rem;
}

.cs-demo-card__note {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ================================================================
   COMPLAINTS / AI FEATURES LIST
================================================================ */
.cs-list {
  list-style: none;
  margin: 2rem 0;
}

.cs-list li {
  display: flex;
  gap: 1rem;
  padding: 1.125rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.65;
}
.cs-list li:first-child { border-top: 1px solid var(--border); }

.cs-list li::before {
  content: '→';
  color: var(--accent);
  font-family: var(--font-mono);
  flex-shrink: 0;
  margin-top: 0.125rem;
}

/* ================================================================
   QUOTE
================================================================ */
.cs-quote {
  border-left: 2px solid var(--accent);
  padding: 1.375rem 2rem;
  margin: 3rem 0;
  background: var(--accent-light);
}

.cs-quote blockquote {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-style: italic;
  font-weight: 300;
  color: var(--text-primary);
  line-height: 1.55;
  margin-bottom: 0.75rem;
}

.cs-quote cite {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  color: var(--text-tertiary);
  font-style: normal;
  text-transform: uppercase;
}

/* ================================================================
   USER FLOW STEPS
================================================================ */
.cs-flow {
  margin: 2.5rem 0;
}

.cs-flow__label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 1.25rem;
  display: block;
}

.cs-flow__steps {
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: var(--border);
}

.cs-flow__step {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 1.5rem;
  background: var(--bg);
  padding: 1.375rem 1.75rem;
  align-items: start;
  transition: background 0.25s;
}
.cs-flow__step:hover { background: var(--bg-alt); }

.cs-flow__step-num {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.15em;
  color: var(--accent);
  font-weight: 400;
  padding-top: 0.25rem;
  flex-shrink: 0;
}

.cs-flow__step-text {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ================================================================
   IMAGE BLOCK
================================================================ */
.cs-img-block {
  width: 100%;
  position: relative;
  overflow: hidden;
  margin: 3rem 0;
  border: 1px solid var(--border-mid);
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 16 / 9;
}

.cs-img-block--tall { aspect-ratio: 4 / 3; }

.cs-img-block__inner {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.cs-img-block__caption {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  position: relative;
  z-index: 1;
}

.cs-img-block__bg-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: clamp(4rem, 10vw, 8rem);
  font-weight: 300;
  color: rgba(255,255,255,0.035);
  user-select: none;
  letter-spacing: -0.02em;
}

.cs-img-caption {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  color: var(--text-tertiary);
  text-align: center;
  display: block;
  margin-top: 0.75rem;
}

/* ================================================================
   DESIGN PROGRESSION
================================================================ */
.cs-design-phases {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  background: var(--border);
  margin: 2.5rem 0;
}

.cs-design-phase {
  background: var(--bg);
  padding: 2.25rem;
  transition: background 0.25s;
}
.cs-design-phase:hover { background: var(--bg-alt); }

.cs-design-phase__letter {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  color: var(--accent);
  background: var(--accent-light);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.875rem;
  height: 1.875rem;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
}

.cs-design-phase h3 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 400;
  margin-bottom: 0.625rem;
  color: var(--text-primary);
}

.cs-design-phase p {
  font-size: 0.84375rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ================================================================
   OUTCOMES
================================================================ */
.cs-outcomes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: var(--border);
  margin: 2.5rem 0;
}

.cs-outcome {
  background: var(--bg);
  padding: 2.5rem 2rem;
  transition: background 0.25s;
}
.cs-outcome:hover { background: var(--bg-alt); }

.cs-outcome__num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 300;
  color: var(--accent);
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
  line-height: 1;
}

.cs-outcome p {
  font-size: 0.84375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ================================================================
   REFLECTIONS
================================================================ */
.cs-reflections {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  background: var(--border);
  margin: 2.5rem 0;
}

.cs-reflection {
  background: var(--bg);
  padding: 2.25rem;
  transition: background 0.25s;
}
.cs-reflection:hover { background: var(--bg-alt); }

.cs-reflection h3 {
  font-family: var(--font-display);
  font-size: 1.1875rem;
  font-weight: 400;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.cs-reflection h3::before {
  content: '';
  display: block;
  width: 20px;
  height: 1px;
  background: var(--accent);
}

/* ================================================================
   IMAGES & FIGURES
================================================================ */

/* Full-bleed banner between hero and TOC */
.cs-banner {
  width: 100%;
  border-bottom: 1px solid var(--border);
}

.cs-banner img {
  width: 100%;
  height: 100%;
  max-height: 480px;
}

/* Standard figure */
.cs-figure {
  margin: 2.5rem 0;
}

.cs-figure img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--border-mid);
}

.cs-figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  color: var(--text-tertiary);
  text-align: center;
  padding-top: 0.625rem;
  text-transform: uppercase;
}

/* Side-by-side figures */
.cs-figures-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  background: var(--border);
  margin: 2.5rem 0;
}

.cs-figures-row .cs-figure {
  margin: 0;
  background: var(--bg);
  padding: 1.25rem;
}

.cs-figures-row .cs-figure img {
  border: none;
}

/* Figma embed */
.cs-figma-embed {
  width: 100%;
  border: 1px solid var(--border-mid);
  overflow: hidden;
  margin: 2.5rem 0;
  background: var(--bg-alt);
}

.cs-figma-embed iframe {
  display: block;
  border: none;
  width: 100%;
  height: 700px;
}

.cs-figma-fallback {
  padding: 2rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

.cs-figma-fallback a {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  border-bottom: 1px solid var(--accent);
  padding-bottom: 1px;
  transition: opacity 0.25s;
}
.cs-figma-fallback a:hover { opacity: 0.7; }

/* Client logo in hero */
.cs-hero__logo {
  height: 24px;
  width: auto;
  margin-bottom: 2rem;
  opacity: 0.7;
  display: block;
}

@media (max-width: 640px) {
  .cs-figures-row { grid-template-columns: 1fr; }
  .cs-figma-embed iframe { height: 450px; }
}

/* ================================================================
   NEXT PROJECT
================================================================ */
.cs-next {
  padding: 5rem 4rem;
  max-width: var(--max-w);
  margin: 0 auto;
}

.cs-next__link {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 2rem;
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  transition: padding-left 0.4s var(--ease-out);
}
.cs-next__link:hover { padding-left: 1.25rem; }

.cs-next__link h2 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2rem, 5vw, 3.75rem);
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--text-primary);
  transition: color 0.3s;
}
.cs-next__link:hover h2 { color: var(--accent); }

.cs-next__meta { text-align: right; }

.cs-next__meta p {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--text-tertiary);
  text-transform: uppercase;
}

/* ================================================================
   HERO VARIANTS — legacy class names used in NDA pages
================================================================ */
.cs-hero__nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4rem;
}

.cs-hero__counter {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: var(--text-tertiary);
}

.cs-hero__subtitle {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 300;
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.5;
  max-width: 52ch;
  margin-top: 0.75rem;
}

.cs-hero__image {
  margin-top: 3.5rem;
  width: 100%;
  aspect-ratio: 21 / 7;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cs-hero__image-bg-text {
  font-family: var(--font-display);
  font-size: clamp(4rem, 12vw, 10rem);
  font-weight: 300;
  color: rgba(255, 255, 255, 0.07);
  letter-spacing: 0.05em;
  user-select: none;
  white-space: nowrap;
}

/* ================================================================
   SECTION CONTAINER
================================================================ */
.cs-section--alt {
  background: var(--bg-alt);
}

.cs-section__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 4rem;
}

.cs-body p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.875;
  margin-bottom: 1.375rem;
}
.cs-body p:last-child { margin-bottom: 0; }

/* ================================================================
   PHASE LABEL
================================================================ */
.cs-phase__label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

/* ================================================================
   RESEARCH METHODS GRID
================================================================ */
.cs-methods {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  background: var(--border);
  margin: 2.5rem 0;
}

.cs-method {
  background: var(--bg-alt);
  padding: 2rem;
  transition: background 0.25s;
}
.cs-method:hover { background: var(--bg); }

.cs-method h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 0.625rem;
}

.cs-method p {
  font-size: 0.84375rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ================================================================
   DELIVERABLES LIST
================================================================ */
.cs-deliverables {
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: var(--border);
  margin: 2.5rem 0;
}

.cs-deliverable {
  background: var(--bg);
  padding: 2rem;
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  transition: background 0.25s;
}
.cs-deliverable:hover { background: var(--bg-alt); }

.cs-deliverable__arrow {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  flex-shrink: 0;
  margin-top: 0.2rem;
  line-height: 1;
}

.cs-deliverable h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.cs-deliverable p {
  font-size: 0.84375rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ================================================================
   DESIGN STEPS
================================================================ */
.cs-design-steps {
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: var(--border);
  margin: 2.5rem 0;
}

.cs-design-step {
  background: var(--bg-alt);
  padding: 2rem;
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  transition: background 0.25s;
}
.cs-design-step:hover { background: var(--bg); }

.cs-design-step__letter {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 300;
  color: var(--accent);
  line-height: 1;
  flex-shrink: 0;
  min-width: 2rem;
  text-align: center;
}

.cs-design-step h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.cs-design-step p {
  font-size: 0.84375rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ================================================================
   IMG BLOCK LABEL (legacy)
================================================================ */
.cs-img-block__label {
  position: absolute;
  bottom: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
  white-space: nowrap;
}

/* ================================================================
   NDA NOTICE BANNER
================================================================ */
.cs-nda-notice {
  padding: 1rem 4rem;
  background: var(--accent-light);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.cs-nda-notice__label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  flex-shrink: 0;
}

.cs-nda-notice p {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ================================================================
   RESPONSIVE — Case Study
================================================================ */
@media (max-width: 900px) {
  .cs-hero { padding: 7rem 2rem 3.5rem; }
  .cs-toc { padding: 1.5rem 2rem; }
  .cs-toc__inner { gap: 1.5rem; }
  .cs-body, .cs-body--wide { padding: 0 2rem; }
  .cs-section--full { padding: 4rem 2rem; }
  .cs-stats { grid-template-columns: 1fr; }
  .cs-stat { border-right: none; border-bottom: 1px solid var(--border); padding: 2.5rem 2rem; }
  .cs-stat:last-child { border-bottom: none; }
  .cs-survey-grid { grid-template-columns: 1fr; }
  .cs-demo-row { grid-template-columns: 1fr; }
  .cs-design-phases { grid-template-columns: 1fr; }
  .cs-outcomes { grid-template-columns: 1fr; }
  .cs-reflections { grid-template-columns: 1fr; }
  .cs-next { padding: 4rem 2rem; }
  .cs-next__link { grid-template-columns: 1fr; }
  .cs-next__meta { text-align: left; }
  .cs-methods { grid-template-columns: 1fr; }
  .cs-section__inner { padding: 0 2rem; }
  .cs-hero__image { aspect-ratio: 16 / 7; }
  .cs-nda-notice { padding: 1rem 2rem; }
}