/* ============================================================
   CASE STUDY — PAGE STYLES
   Builds on style.css tokens and base styles
   ============================================================ */

/* ============================================================
   HERO
   ============================================================ */
.cs-hero {
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 140px var(--pad-x) 80px;
}

.cs-eyebrow {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 28px;
}

.cs-title {
  font-family: var(--serif);
  font-size: clamp(52px, 7.5vw, 110px);
  font-weight: 700;
  line-height: 0.96;
  letter-spacing: -0.03em;
  margin-bottom: 64px;
  max-width: 1100px;
}

.cs-title em {
  font-style: italic;
  color: var(--accent);
}

.cs-hero-sub {
  font-size: clamp(16px, 1.4vw, 20px);
  color: var(--muted-lt);
  max-width: 600px;
  margin-top: -40px;
  margin-bottom: 48px;
}

.cs-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--border);
  padding-top: 32px;
  max-width: 1000px;
}

.cs-meta-item {
  padding-right: 32px;
}

.cs-meta-item + .cs-meta-item {
  border-left: 1px solid var(--border);
  padding-left: 32px;
}

.cs-meta-label {
  display: block;
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}

.cs-meta-value {
  display: block;
  font-size: 13px;
  font-weight: 300;
  color: var(--muted-lt);
  line-height: 1.6;
}

/* ============================================================
   IMAGE BLOCKS
   ============================================================ */
.cs-img-full {
  padding: 0 var(--pad-x);
  margin: 80px 0;
}

.cs-img-placeholder {
  width: 100%;
  aspect-ratio: 16 / 8;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cs-img-real {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
}

.cs-img-centered {
  width: 75%;
  margin: 0 auto;
}

.cs-img-placeholder span {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.cs-img-hero {
  aspect-ratio: 16 / 7;
}

.cs-img-padded {
  padding: 48px;
}

.cs-img-sm {
  aspect-ratio: 4 / 3;
  margin-bottom: 24px;
}

.cs-img-concept {
  margin-bottom: 24px;
}

.cs-img-3up {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  padding: 0 var(--pad-x);
  margin: 80px 0 12px;
}

@media (max-width: 600px) {
  .cs-img-3up { grid-template-columns: 1fr; }
}

.cs-img-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 0 var(--pad-x);
  margin: 80px 0;
}

.cs-img-pair .cs-img-placeholder {
  aspect-ratio: 4 / 3;
}

/* ============================================================
   BODY CONTENT
   ============================================================ */
.cs-body {
  padding-bottom: 80px;
}

/* Section row: label left, content right */
.cs-section {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 48px;
  padding: 80px var(--pad-x);
  border-top: 1px solid var(--border);
  max-width: 1400px;
  margin: 0 auto;
}

.cs-section-label {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 6px;
}

.cs-section-label .section-num {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.cs-section-label .section-label {
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
}

.cs-section-content {
  max-width: 680px;
}

.cs-heading {
  font-family: var(--serif);
  font-size: clamp(28px, 2.8vw, 42px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 28px;
}

.cs-subheading {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-top: 40px;
  margin-bottom: 16px;
}

.cs-section-content p {
  font-size: 16px;
  font-weight: 300;
  color: var(--muted-lt);
  line-height: 1.85;
  margin-bottom: 20px;
}

.cs-section-content p:last-child {
  margin-bottom: 0;
}

.cs-list {
  margin: 20px 0 20px 20px;
}

.cs-list li {
  font-size: 16px;
  font-weight: 300;
  color: var(--muted-lt);
  line-height: 1.85;
  margin-bottom: 8px;
  padding-left: 8px;
}

/* ============================================================
   PULL QUOTE
   ============================================================ */
.cs-quote {
  padding: 80px var(--pad-x);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin: 0 0 0 0;
  text-align: center;
}

.cs-quote p {
  font-family: var(--serif);
  font-size: clamp(28px, 3.5vw, 52px);
  font-style: italic;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--text);
  max-width: 900px;
  margin: 0 auto 24px;
}

.cs-quote cite {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  font-style: normal;
}

/* ============================================================
   RESULTS STATS
   ============================================================ */
.cs-results-intro {
  font-size: 14px !important;
  color: var(--muted-lt) !important;
  margin-bottom: 16px !important;
}

.cs-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 12px;
}

.cs-stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.cs-stat-card--wide {
  text-align: center;
  align-items: center;
  margin-bottom: 40px;
}

.cs-stat-num {
  font-family: var(--serif);
  font-size: clamp(36px, 4vw, 56px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
  line-height: 1;
}

.cs-stat-card .cs-stat-label {
  font-size: 13px;
  font-weight: 300;
  color: var(--muted-lt);
  line-height: 1.5;
}

@media (max-width: 900px) {
  .cs-stats {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   MEMBER QUOTES
   ============================================================ */
.cs-member-quotes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 40px;
}

@media (max-width: 900px) {
  .cs-member-quotes {
    grid-template-columns: 1fr;
  }
}

.cs-member-quote {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 28px 32px;
}

.cs-member-quote p {
  font-size: 15px !important;
  font-weight: 400 !important;
  color: var(--text) !important;
  line-height: 1.7 !important;
  margin-bottom: 14px !important;
  font-style: italic;
}

.cs-member-quote cite {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  font-style: normal;
}

/* ============================================================
   CARDS (Complexities)
   ============================================================ */
.cs-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 36px;
}

.cs-card {
  padding: 28px 0;
  border-top: 1px solid var(--border);
}

.cs-card:last-child {
  border-bottom: 1px solid var(--border);
}

.cs-card h4 {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 10px;
}

.cs-card p {
  font-size: 14px !important;
  color: var(--muted-lt) !important;
  line-height: 1.75 !important;
  margin-bottom: 0 !important;
}

/* ============================================================
   CONCEPTS (3-up)
   ============================================================ */
.cs-concepts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding: 0 var(--pad-x);
  margin: 0 0 80px;
}

.cs-concepts--2x2 {
  grid-template-columns: repeat(2, 1fr);
}

.cs-concept h4 {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.cs-concept p {
  font-size: 13px;
  font-weight: 300;
  color: var(--muted-lt);
  line-height: 1.7;
}

/* ============================================================
   4-UP IMAGE GRID
   ============================================================ */
.cs-img-4up {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  padding: 0 var(--pad-x);
  margin: 0 0 80px;
}

.cs-img-4up .cs-img-placeholder {
  aspect-ratio: 3 / 4;
}

@media (max-width: 900px) {
  .cs-img-4up {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .cs-img-4up {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   FINDINGS
   ============================================================ */
.cs-findings {
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.cs-finding {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-top: 1px solid var(--border);
  align-items: center;
}

.cs-finding:last-child {
  border-bottom: 1px solid var(--border);
}

.cs-finding-num {
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: -0.04em;
  line-height: 1;
}

.cs-finding p {
  font-size: 15px !important;
  font-weight: 300 !important;
  color: var(--muted-lt) !important;
  line-height: 1.8 !important;
  margin-bottom: 0 !important;
}

/* ============================================================
   SCROLLING IMAGE STRIP
   ============================================================ */
.cs-scroll-strip {
  overflow: hidden;
  margin: 80px 0;
  padding: 0;
}

.cs-scroll-track {
  display: flex;
  gap: 16px;
  width: max-content;
  animation: scrollTrack 40s linear infinite;
}

.cs-scroll-track:hover {
  animation-play-state: paused;
}

.cs-scroll-track img {
  height: 480px;
  width: auto;
  border-radius: 4px;
  display: block;
  flex-shrink: 0;
}

@keyframes scrollTrack {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ============================================================
   CAPTIONS
   ============================================================ */
figcaption {
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-top: 10px;
  line-height: 1.5;
}

/* ============================================================
   CLOSING STATEMENT
   ============================================================ */
.cs-closing {
  padding: 80px var(--pad-x);
  border-top: 1px solid var(--border);
  max-width: 1400px;
  margin: 0 auto;
}

.cs-closing p {
  font-family: var(--serif);
  font-size: clamp(20px, 2.2vw, 30px);
  font-weight: 700;
  font-style: italic;
  letter-spacing: -0.02em;
  line-height: 1.4;
  color: var(--muted-lt);
  max-width: 820px;
}

/* ============================================================
   FOOTER NAV
   ============================================================ */
.cs-next {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 48px var(--pad-x);
  border-top: 1px solid var(--border);
}

.cs-back {
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.02em;
  transition: color 0.2s;
}

.cs-back:hover {
  color: var(--text);
}

.cs-next-project {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
  transition: opacity 0.2s;
}

.cs-next-project:hover {
  opacity: 0.7;
}

.cs-next-label {
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
}

.cs-next-title {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .cs-meta {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }

  .cs-meta-item + .cs-meta-item {
    border-left: none;
    padding-left: 0;
  }

  .cs-section {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 56px var(--pad-x);
  }

  .cs-section-label {
    flex-direction: row;
    align-items: center;
    gap: 16px;
    padding-top: 0;
  }

  .cs-concepts {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .cs-img-pair {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   SURFACE RANKING DOT MATRIX
   ============================================================ */
.cs-ranking-wrap {
  padding: 0 var(--pad-x);
  margin: 80px 0;
  overflow-x: auto;
}

.cs-ranking-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.cs-ranking-table th {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0 16px 16px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.cs-ranking-table th.cs-rank-surface,
.cs-ranking-table td.cs-rank-surface {
  text-align: left;
  padding-left: 0;
}

.cs-ranking-table td {
  padding: 14px 16px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.cs-ranking-table td.cs-rank-surface {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--text);
  white-space: nowrap;
}

.cs-ranking-table tbody tr:last-child td {
  border-bottom: none;
}

.dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-high {
  background: var(--accent);
}

.dot-mid {
  background: var(--muted);
}

.dot-low {
  background: transparent;
  border: 1.5px solid var(--border);
}

.cs-ranking-legend {
  display: flex;
  gap: 24px;
  margin-top: 16px;
  font-size: 11px;
  color: var(--muted);
  align-items: center;
}

.cs-ranking-legend span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.cs-usecase-table th,
.cs-usecase-table td {
  text-align: left;
}

.cs-usecase-surfaces {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 12px 16px;
}

.cs-surface-tag {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 3px 8px;
  white-space: nowrap;
}

.cs-usecase-rationale {
  font-size: 13px;
  color: var(--muted-lt);
  padding: 12px 16px;
}

@media (max-width: 600px) {
  .cs-hero {
    padding-top: 120px;
    padding-bottom: 56px;
  }

  .cs-meta {
    grid-template-columns: 1fr;
  }

  .cs-next {
    flex-direction: column;
    gap: 32px;
    align-items: flex-start;
  }

  .cs-next-project {
    align-items: flex-start;
  }
}