/* ===== CASE STUDY — shared across all case study pages ===== */

/* Nav: always opaque on case study pages (the hero sits directly under
   the bar, so there's nothing to stay transparent for), content column
   capped to match the page's --zb-max (set per-project) so it lines up
   with the hero and section content below it; the bar itself stays
   full-width. Tint matches the homepage's scrolled nav — this was on
   --paper (236 240 241), which read grey against these white pages. */
nav {
  background: rgb(255 255 255 / 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--light);
  padding-left: max(var(--gutter), calc((100% - var(--zb-max, 920px)) / 2));
  padding-right: max(var(--gutter), calc((100% - var(--zb-max, 920px)) / 2));
}

/* Hover underline lands where the homepage's sliding .nav-indicator sits —
   on the nav's bottom edge, on top of the 1px rule — instead of hugging
   each link's own box a few px higher. The links are stretched to the full
   bar height so their ::after bottom edge IS the bar's bottom edge; the
   vertical padding that made the touch target moves onto that height. */
.nav-links {
  align-self: stretch;
  align-items: stretch;
}
.nav-links li {
  display: flex;
  align-items: stretch;
}
.nav-links a {
  height: 100%;
  padding-top: 0;
  padding-bottom: 0;
}
.nav-links a::after { height: 2px; }

/* ——— SHARED: Next Project + Back Link ——— */
.next-project {
  background: var(--ink);
  padding: var(--space-xl) var(--gutter);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  flex-direction: column;
  gap: var(--space-s);
}
.next-project-label {
  font-size: clamp(0.55rem, 0.48rem + 0.2vw, 0.65rem);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: rgba(236,240,241,0.7); /* WCAG: was 0.4, ~3:1; now ~5.5:1 on --ink */
  font-weight: 500;
}
.next-project-title {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(1.5rem, 1rem + 2vw, 2.8rem);
  color: var(--paper);
  text-decoration: none;
  transition: color 0.3s;
  line-height: 1.15;
}
.next-project-title:hover { color: var(--accent); }
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: clamp(0.6rem, 0.55rem + 0.15vw, 0.72rem);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--paper);
  text-decoration: none;
  font-weight: 500;
  margin-top: var(--space-s);
  transition: color 0.3s;
}
.back-link:hover { color: var(--white); } /* WCAG: accent on --ink = 3.76:1 (fails); white = 19:1 */
.back-link::before { content: '\2190'; font-size: 1rem; }

/* ============================================================
   CASE STUDY STYLE A — BoA, PenFed, Royal, Comet
   Uses .case-* class naming
   ============================================================ */

.case-hero {
  padding: var(--space-2xl) var(--gutter) var(--space-xl);
  padding-top: calc(var(--space-2xl) + 4rem);
  background: var(--ink);
  position: relative;
  overflow: hidden;
}
.case-hero-num {
  position: absolute;
  top: 4rem; right: var(--gutter);
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(6rem, 4rem + 10vw, 16rem);
  color: rgba(255,255,255,0.04);
  line-height: 1;
  user-select: none;
}
.case-hero-tag {
  font-size: clamp(0.55rem, 0.48rem + 0.2vw, 0.65rem);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--paper); /* WCAG: accent on --ink = 3.76:1 (fails small text); paper = 16:1 */
  margin-bottom: var(--space-s);
  font-weight: 500;
  position: relative;
  display: flex; align-items: center; gap: 0.8rem;
}
.case-hero-tag::before {
  content: '';
  width: 1.5rem; height: 1px;
  background: var(--accent);
  display: inline-block;
}
.case-hero-title {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(2.5rem, 1.5rem + 6vw, 6rem);
  line-height: 0.95;
  color: var(--paper);
  margin-bottom: var(--space-m);
  max-width: 900px;
  position: relative;
}
.case-hero-meta {
  display: flex;
  gap: var(--space-l);
  flex-wrap: wrap;
  position: relative;
}
.case-meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.case-meta-label {
  font-size: clamp(0.52rem, 0.48rem + 0.15vw, 0.62rem);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(236,240,241,0.7); /* WCAG: was 0.4, ~3:1; now ~5.5:1 on --ink */
  font-weight: 500;
}
.case-meta-value {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(0.9rem, 0.8rem + 0.3vw, 1.1rem);
  color: var(--paper);
}

.case-section {
  padding: var(--space-xl) var(--gutter);
  max-width: 900px;
  margin: 0 auto;
}
.case-section-label {
  font-size: clamp(0.55rem, 0.48rem + 0.2vw, 0.65rem);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--space-xs);
  display: flex; align-items: center; gap: 0.8rem;
}
.case-section-label::before {
  content: '';
  width: 1.5rem; height: 1px;
  background: var(--accent);
  display: inline-block;
}
.case-section-title {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(1.8rem, 1.2rem + 3vw, 3.2rem);
  line-height: 1.1;
  color: var(--ink);
  margin-bottom: var(--space-m);
}
.case-section-title em { font-style: italic; color: var(--accent); }
.case-body {
  font-size: clamp(0.88rem, 0.8rem + 0.3vw, 1.02rem);
  line-height: 1.85;
  color: var(--muted);
}
.case-body strong { color: var(--ink); font-weight: 600; }

.case-img-placeholder {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: var(--space-l) 0;
  border: 1px dashed var(--muted);
  color: var(--muted);
  font-size: clamp(0.6rem, 0.55rem + 0.15vw, 0.72rem);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 500;
}
.case-img-full {
  width: 100%;
  aspect-ratio: 21/9;
  background: var(--accent2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(236,240,241,0.3);
  font-size: clamp(0.6rem, 0.55rem + 0.15vw, 0.72rem);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 500;
}

.process-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--light);
  margin-top: var(--space-m);
}
.process-step {
  display: grid;
  grid-template-columns: clamp(30px, 2vw + 20px, 50px) 1fr;
  gap: var(--space-m);
  padding: var(--space-m) 0;
  border-bottom: 1px solid var(--light);
}
.process-step-num {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(1.2rem, 1rem + 0.5vw, 1.6rem);
  color: var(--accent);
  padding-top: 0.15rem;
}
.process-step-title {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(1rem, 0.85rem + 0.4vw, 1.25rem);
  color: var(--ink);
  margin-bottom: 0.5rem;
}
.process-step-desc {
  font-size: clamp(0.78rem, 0.72rem + 0.2vw, 0.9rem);
  color: var(--muted);
  line-height: 1.7;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: 1.5px;
  margin-top: var(--space-m);
  background: var(--light);
}
.result-card {
  background: var(--white);
  padding: clamp(1.5rem, 1rem + 1.5vw, 2.5rem);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.result-card-value {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(1rem, 0.8rem + 0.5vw, 1.3rem);
  color: var(--accent);
  letter-spacing: 0.05em;
  line-height: 1.3;
}
.result-card-label {
  font-size: clamp(0.68rem, 0.62rem + 0.18vw, 0.78rem);
  color: var(--muted);
  line-height: 1.6;
}

/* ============================================================
   CASE STUDY STYLE B — Zumba (ClassBuzz)
   Uses .cs-* class naming
   ============================================================ */

.cs-hero {
  padding: calc(var(--space-2xl) + 3rem) var(--gutter) var(--space-xl);
  background: var(--paper);
  border-bottom: 1px solid var(--light);
}
.cs-hero-inner { max-width: var(--content-width); margin: 0 auto; }
.cs-hero-breadcrumb {
  font-size: clamp(0.55rem, 0.48rem + 0.2vw, 0.65rem);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--space-m);
  display: flex; align-items: center; gap: 0.6rem;
  font-weight: 500;
}
.cs-hero-breadcrumb a { color: var(--muted); text-decoration: none; transition: color 0.3s; }
.cs-hero-breadcrumb a:hover { color: var(--accent); }
.cs-hero-breadcrumb span { color: var(--light); }
.cs-hero-tag {
  display: inline-block;
  font-size: clamp(0.55rem, 0.48rem + 0.2vw, 0.65rem);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--white);
  background: var(--accent);
  padding: 0.35rem 0.9rem;
  font-weight: 500;
  margin-bottom: var(--space-s);
}
.cs-hero-title {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(3rem, 2rem + 6vw, 6.5rem);
  line-height: 0.92;
  color: var(--ink);
  margin-bottom: var(--space-s);
  letter-spacing: 0.01em;
}
.cs-hero-title em { font-style: normal; color: var(--accent); }
.cs-hero-subtitle {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(1rem, 0.85rem + 0.5vw, 1.3rem);
  color: var(--muted);
  line-height: 1.5;
  max-width: 620px;
  margin-bottom: var(--space-l);
  font-style: italic;
}
.cs-hero-meta { display: flex; gap: var(--space-l); flex-wrap: wrap; }
.cs-meta-item { display: flex; flex-direction: column; gap: 0.25rem; }
.cs-meta-label {
  font-size: clamp(0.5rem, 0.45rem + 0.15vw, 0.6rem);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}
.cs-meta-value {
  font-size: clamp(0.8rem, 0.72rem + 0.25vw, 0.95rem);
  color: var(--ink);
  font-weight: 400;
}

.cs-hero-img {
  width: 100%;
  aspect-ratio: 16/7;
  background: var(--light);
  display: flex; align-items: center; justify-content: center;
  border-bottom: 1px solid var(--light);
  color: var(--muted);
  font-size: clamp(0.6rem, 0.55rem + 0.15vw, 0.72rem);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 500;
}
.cs-content { max-width: var(--content-width); margin: 0 auto; padding: 0 var(--gutter); }
.cs-section { padding: var(--space-xl) 0; border-bottom: 1px solid var(--light); }
.cs-section:last-child { border-bottom: none; }
.cs-section-label {
  font-size: clamp(0.52rem, 0.46rem + 0.18vw, 0.62rem);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-xs);
  font-weight: 500;
}
.cs-section-title {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(1.8rem, 1.2rem + 3vw, 3rem);
  line-height: 1.1;
  color: var(--ink);
  margin-bottom: var(--space-m);
}
.cs-section-title em { font-style: italic; color: var(--accent); }
.cs-body {
  font-size: clamp(0.88rem, 0.8rem + 0.25vw, 1rem);
  line-height: 1.85;
  color: var(--muted);
  margin-bottom: var(--space-m);
}
.cs-body strong { color: var(--ink); font-weight: 600; }
.cs-h3 {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(1.2rem, 1rem + 0.6vw, 1.6rem);
  color: var(--ink);
  margin-bottom: var(--space-s);
}
.cs-h3-spaced { margin-top: var(--space-l); }

.cs-why-list { list-style: none; display: flex; flex-direction: column; gap: 0.8rem; margin-top: var(--space-s); }
.cs-why-list li {
  font-size: clamp(0.82rem, 0.75rem + 0.2vw, 0.95rem);
  color: var(--muted);
  line-height: 1.7;
  padding-left: 1.4rem;
  position: relative;
}
.cs-why-list li::before {
  content: '';
  position: absolute;
  left: 0; top: 0.6em;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.persona-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
  gap: 1px;
  background: var(--light);
  margin-top: var(--space-m);
}
.persona-card { background: var(--white); padding: clamp(1.5rem, 1rem + 1.5vw, 2.2rem); }
.persona-name {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(1.1rem, 0.9rem + 0.5vw, 1.35rem);
  color: var(--ink);
  margin-bottom: 0.4rem;
}
.persona-quote {
  font-style: italic;
  font-size: clamp(0.78rem, 0.72rem + 0.2vw, 0.88rem);
  color: var(--accent);
  line-height: 1.55;
  margin-bottom: var(--space-s);
  padding-left: 0.8rem;
  border-left: 2px solid var(--accent);
}
.persona-traits {
  font-size: clamp(0.72rem, 0.66rem + 0.18vw, 0.82rem);
  color: var(--muted);
  line-height: 1.7;
}

.feature-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr));
  gap: var(--space-m);
  margin-top: var(--space-m);
}
.feature-col-title {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(0.85rem, 0.75rem + 0.3vw, 1rem);
  letter-spacing: 0.1em;
  color: var(--ink);
  margin-bottom: 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--light);
}
.feature-col ul { list-style: none; font-size: clamp(0.72rem, 0.66rem + 0.18vw, 0.82rem); color: var(--muted); line-height: 1.8; }

.research-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: 1px;
  background: var(--light);
  margin-top: var(--space-m);
}
.research-step { background: var(--white); padding: clamp(1.5rem, 1rem + 1.5vw, 2.2rem); }
.research-step-title {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(1rem, 0.85rem + 0.4vw, 1.2rem);
  color: var(--ink);
  margin-bottom: 0.5rem;
}
.research-step-desc { font-size: clamp(0.72rem, 0.66rem + 0.18vw, 0.82rem); color: var(--muted); line-height: 1.7; }

.cs-quote {
  background: var(--paper);
  padding: var(--space-l) var(--space-m);
  margin: var(--space-m) 0;
  position: relative;
}
.cs-quote::before {
  content: '\201C';
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(3rem, 2rem + 3vw, 5rem);
  color: var(--accent);
  position: absolute;
  top: -0.1em; left: var(--space-m);
  line-height: 1;
  opacity: 0.3;
}
.cs-quote p {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(1rem, 0.85rem + 0.5vw, 1.3rem);
  color: var(--ink);
  line-height: 1.55;
  font-style: italic;
  position: relative;
}

.cs-img-placeholder {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--light);
  display: flex; align-items: center; justify-content: center;
  margin: var(--space-m) 0;
  border: 1px dashed rgba(127,140,141,0.3);
  color: var(--muted);
  font-size: clamp(0.58rem, 0.52rem + 0.15vw, 0.68rem);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 500;
}
.cs-img-full {
  width: 100%;
  aspect-ratio: 21/9;
  background: var(--accent2);
  display: flex; align-items: center; justify-content: center;
  color: rgba(236,240,241,0.3);
  font-size: clamp(0.58rem, 0.52rem + 0.15vw, 0.68rem);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 500;
}

.phone-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 140px), 1fr));
  gap: var(--space-s);
  margin: var(--space-m) 0;
}
.phone-placeholder {
  aspect-ratio: 9/19;
  background: var(--light);
  border-radius: clamp(12px, 1vw + 8px, 20px);
  display: flex; align-items: center; justify-content: center;
  color: var(--muted);
  font-size: clamp(0.5rem, 0.45rem + 0.15vw, 0.6rem);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  border: 1px dashed rgba(127,140,141,0.25);
  text-align: center;
  padding: 0.5rem;
}

.sprint-day {
  background: var(--paper);
  padding: var(--space-l) var(--space-m);
  margin: var(--space-m) 0;
}
.sprint-day-label {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(1rem, 0.85rem + 0.4vw, 1.2rem);
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: var(--space-s);
}
.sprint-day-body {
  font-size: clamp(0.82rem, 0.75rem + 0.2vw, 0.92rem);
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: var(--space-s);
}
.sprint-h4 {
  font-size: clamp(0.78rem, 0.7rem + 0.2vw, 0.88rem);
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.moscow-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 140px), 1fr));
  gap: 1px;
  background: var(--light);
  margin: var(--space-s) 0;
}
.moscow-col { background: var(--white); padding: clamp(1rem, 0.6rem + 1vw, 1.5rem); }
.moscow-col-title {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(0.8rem, 0.7rem + 0.25vw, 0.95rem);
  letter-spacing: 0.1em;
  color: var(--ink);
  margin-bottom: 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--accent);
}
.moscow-col ul { list-style: none; font-size: clamp(0.68rem, 0.62rem + 0.18vw, 0.78rem); color: var(--muted); line-height: 1.8; }

.wf-iteration {
  margin: var(--space-m) 0;
  padding-bottom: var(--space-m);
  border-bottom: 1px solid var(--light);
}
.wf-iteration:last-child { border-bottom: none; }
.wf-version-label {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(0.9rem, 0.8rem + 0.3vw, 1.1rem);
  letter-spacing: 0.1em;
  color: var(--ink);
  margin-bottom: 0.5rem;
}
.wf-desc {
  font-size: clamp(0.82rem, 0.75rem + 0.2vw, 0.92rem);
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: var(--space-s);
}

.changes-list { list-style: none; display: flex; flex-direction: column; gap: 0.8rem; margin: var(--space-s) 0 var(--space-m); }
.changes-list li {
  font-size: clamp(0.82rem, 0.75rem + 0.2vw, 0.92rem);
  color: var(--muted);
  line-height: 1.7;
  padding-left: 1.6rem;
  position: relative;
}
.changes-list li::before { content: '\2713'; position: absolute; left: 0; top: 0; color: var(--accent); font-weight: 600; }
.changes-list li strong { color: var(--ink); font-weight: 600; }

.screen-showcase { padding: var(--space-l) 0; border-bottom: 1px solid var(--light); }
.screen-showcase:last-child { border-bottom: none; }
.screen-showcase-title {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(1.2rem, 1rem + 0.6vw, 1.6rem);
  color: var(--ink);
  margin-bottom: var(--space-s);
  text-align: center;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr));
  gap: 1px;
  background: var(--ink);
  margin: var(--space-m) 0;
}
.stat-card { background: var(--white); padding: clamp(1.5rem, 1rem + 1.5vw, 2.5rem); text-align: center; }
.stat-card-num {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(2rem, 1.2rem + 3vw, 3.5rem);
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.3rem;
}
.stat-card-label {
  font-size: clamp(0.6rem, 0.55rem + 0.15vw, 0.72rem);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}

.impact-list { list-style: none; display: flex; flex-direction: column; gap: 0.6rem; margin-top: var(--space-s); }
.impact-list li {
  font-size: clamp(0.82rem, 0.75rem + 0.2vw, 0.92rem);
  color: var(--muted);
  line-height: 1.7;
  padding-left: 1.4rem;
  position: relative;
}
.impact-list li::before {
  content: '';
  position: absolute;
  left: 0; top: 0.55em;
  width: 8px; height: 2px;
  background: var(--accent);
}

.learnings-grid { display: flex; flex-direction: column; gap: 1px; background: var(--light); margin-top: var(--space-m); }
.learning-item { background: var(--white); padding: var(--space-m); display: grid; grid-template-columns: auto 1fr; gap: var(--space-s); }
.learning-num {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(1.2rem, 1rem + 0.5vw, 1.5rem);
  color: var(--accent);
  padding-top: 0.1rem;
}
.learning-title {
  font-family: 'Rufina', Georgia, serif;
  font-size: clamp(0.95rem, 0.85rem + 0.3vw, 1.1rem);
  color: var(--ink);
  margin-bottom: 0.3rem;
}
.learning-desc { font-size: clamp(0.75rem, 0.68rem + 0.2vw, 0.85rem); color: var(--muted); line-height: 1.7; }

/* ——— SHARED: SITE FOOTER ——— */
/* Just the closing bar — kept in sync with homepage.css's footer
   redesign (name/tagline and link columns were dropped there). */
footer {
  background: var(--surface);
  padding: 34px var(--gutter);
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-xs);
}
.footer-copy {
  font-size: clamp(0.65rem, 0.6rem + 0.15vw, 0.75rem);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(241,241,241,0.5); /* WCAG: was 0.25, ~1.7:1; now ~5.7:1 on --ink */
}