/* -- Case Study Shared Layout -- */
/* Each page overrides --cs-bg, --cs-text, --cs-muted, --cs-accent, --cs-border */

:root {
  --cs-bg:     #ffffff;
  --cs-text:   #111111;
  --cs-muted:  #777777;
  --cs-accent: #111111;
  --cs-faint:  rgba(0,0,0,0.06);
  --cs-border: rgba(0,0,0,0.1);

  --cs-font-display: 'Syne', system-ui, sans-serif;
  --cs-font-sans:    'Inter', system-ui, sans-serif;
  --cs-font-mono:    'JetBrains Mono', monospace;
}

/* -- Base reset for case study pages -- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--cs-font-sans);
  background: var(--cs-bg);
  color: var(--cs-text);
  line-height: 1.5;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

a { color: inherit; text-decoration: none; }

/* -- Reveal -- */
.cs-reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.cs-reveal.delay-1 { transition-delay: 0.08s; }
.cs-reveal.delay-2 { transition-delay: 0.16s; }
.cs-reveal.delay-3 { transition-delay: 0.24s; }

.cs-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* -- Case study nav -- */
.cs-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem clamp(1.5rem, 5vw, 4rem);
  background: var(--cs-bg);
  border-bottom: 1px solid var(--cs-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  gap: 1rem;
}

.cs-nav-back {
  font-family: var(--cs-font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cs-muted);
  transition: color 0.15s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.cs-nav-brand {
  font-family: var(--cs-font-display);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cs-text);
  opacity: 0.35;
  transition: opacity 0.15s;
}

.cs-nav-brand:hover { opacity: 0.7; }

.cs-nav-cta {
  font-family: var(--cs-font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--cs-bg);
  background: var(--cs-text);
  padding: 0.5rem 1.1rem;
  border-radius: 3px;
  letter-spacing: -0.01em;
  white-space: nowrap;
  transition: opacity 0.15s;
}

.cs-nav-cta:hover { opacity: 0.82; }

/* -- Hero -- */
.cs-hero {
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: clamp(4rem, 8vw, 7rem) clamp(1.5rem, 5vw, 4rem) clamp(3rem, 6vw, 5rem);
  background: var(--cs-bg);
  border-bottom: 1px solid var(--cs-border);
  position: relative;
  overflow: hidden;
}

.cs-hero-label {
  font-family: var(--cs-font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cs-muted);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.cs-hero-label::before {
  content: '';
  display: block;
  width: 20px;
  height: 1px;
  background: var(--cs-muted);
  flex-shrink: 0;
  opacity: 0.5;
}

.cs-hero-title {
  font-family: var(--cs-font-display);
  font-size: clamp(3.5rem, 9vw, 9rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 0.9;
  text-transform: uppercase;
  color: var(--cs-text);
  max-width: 1100px;
  margin-bottom: 3rem;
}

.cs-hero-bottom {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  max-width: 1440px;
}

.cs-hero-desc {
  font-size: clamp(0.9rem, 1.4vw, 1.05rem);
  color: var(--cs-muted);
  line-height: 1.7;
  max-width: 480px;
}

.cs-hero-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.5rem;
  flex-shrink: 0;
  text-align: right;
}

.cs-hero-industry {
  font-family: var(--cs-font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cs-muted);
}

.cs-hero-stack-preview {
  font-size: 0.72rem;
  color: var(--cs-muted);
  opacity: 0.6;
}

/* -- Sections -- */
.cs-section {
  padding: clamp(4rem, 8vw, 7rem) clamp(1.5rem, 5vw, 4rem);
  border-bottom: 1px solid var(--cs-border);
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
}

.cs-section-label {
  font-family: var(--cs-font-mono);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cs-muted);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.cs-section-label::before {
  content: attr(data-num);
  opacity: 0.4;
}

.cs-section-title {
  font-family: var(--cs-font-display);
  font-size: clamp(1.75rem, 3.5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--cs-text);
  line-height: 0.95;
  margin-bottom: 1.5rem;
}

.cs-section-body {
  font-size: clamp(0.9rem, 1.4vw, 1rem);
  color: var(--cs-muted);
  line-height: 1.8;
  max-width: 680px;
}

/* -- Deliverables grid -- */
.cs-deliverables {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border: 1px solid var(--cs-border);
  margin-top: 3rem;
}

.cs-deliverable {
  padding: 2rem 2.25rem;
  border-right: 1px solid var(--cs-border);
  border-bottom: 1px solid var(--cs-border);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.cs-deliverable:nth-child(even) { border-right: none; }
.cs-deliverable:nth-last-child(-n+2) { border-bottom: none; }

.cs-deliverable-num {
  font-family: var(--cs-font-mono);
  font-size: 0.58rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--cs-muted);
  opacity: 0.5;
  text-transform: uppercase;
}

.cs-deliverable-title {
  font-family: var(--cs-font-display);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--cs-text);
  line-height: 1.1;
}

.cs-deliverable-desc {
  font-size: 0.82rem;
  color: var(--cs-muted);
  line-height: 1.7;
}

/* -- Mockup container -- */
.cs-mockup-wrap {
  margin-top: 3rem;
  border: 1px solid var(--cs-border);
  background: var(--cs-faint);
  border-radius: 6px;
  overflow: hidden;
  padding: 2.5rem;
}

.cs-mockup-label {
  font-family: var(--cs-font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cs-muted);
  opacity: 0.5;
  margin-bottom: 1.5rem;
}

/* -- Stack tags -- */
.cs-stack-section {
  padding: clamp(3rem, 5vw, 4.5rem) clamp(1.5rem, 5vw, 4rem);
  border-bottom: 1px solid var(--cs-border);
  background: var(--cs-faint);
}

.cs-stack-inner {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
  gap: clamp(2rem, 5vw, 6rem);
}

.cs-stack-title {
  font-family: var(--cs-font-mono);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cs-muted);
  white-space: nowrap;
  padding-top: 0.3rem;
  flex-shrink: 0;
}

.cs-stack-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.cs-stack-tag {
  font-family: var(--cs-font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--cs-muted);
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--cs-border);
  border-radius: 2px;
  background: var(--cs-bg);
}

/* -- Depth markers -- */
.cs-depth-section {
  padding: clamp(3rem, 5vw, 4.5rem) clamp(1.5rem, 5vw, 4rem);
  border-bottom: 1px solid var(--cs-border);
}

.cs-depth-inner {
  max-width: 1440px;
  margin: 0 auto;
}

.cs-depth-title {
  font-family: var(--cs-font-mono);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cs-muted);
  margin-bottom: 1.75rem;
}

.cs-depth-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.6rem 3rem;
  list-style: none;
  max-width: 900px;
}

.cs-depth-list li {
  font-size: 0.82rem;
  color: var(--cs-text);
  line-height: 1.5;
  padding-left: 1.25rem;
  position: relative;
  opacity: 0.75;
}

.cs-depth-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--cs-accent);
  font-size: 0.65rem;
  top: 0.15rem;
  opacity: 0.6;
}

/* -- Bottom CTA -- */
.cs-cta {
  padding: clamp(5rem, 10vw, 8rem) clamp(1.5rem, 5vw, 4rem);
  background: var(--cs-bg);
}

.cs-cta-inner {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 3rem;
}

.cs-cta-headline {
  font-family: var(--cs-font-display);
  font-size: clamp(2rem, 4.5vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--cs-text);
  line-height: 0.92;
  max-width: 700px;
}

.cs-cta-headline span {
  opacity: 0.35;
}

.cs-cta-btn {
  font-family: var(--cs-font-display);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cs-bg);
  background: var(--cs-text);
  padding: 0.85rem 1.75rem;
  border-radius: 3px;
  white-space: nowrap;
  flex-shrink: 0;
  transition: opacity 0.15s;
}

.cs-cta-btn:hover { opacity: 0.85; }

/* -- Footer -- */
.cs-footer {
  border-top: 1px solid var(--cs-border);
  padding: 1.75rem clamp(1.5rem, 5vw, 4rem);
  background: var(--cs-bg);
}

.cs-footer-inner {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.cs-footer-logo {
  font-family: var(--cs-font-display);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cs-text);
  opacity: 0.35;
  transition: opacity 0.15s;
}

.cs-footer-logo:hover { opacity: 0.7; }

.cs-footer-links {
  display: flex;
  gap: 1.75rem;
}

.cs-footer-links a {
  font-size: 0.72rem;
  color: var(--cs-muted);
  transition: color 0.15s;
}

.cs-footer-links a:hover { color: var(--cs-text); }

.cs-footer-legal {
  font-family: var(--cs-font-mono);
  font-size: 0.58rem;
  color: var(--cs-muted);
  letter-spacing: 0.08em;
  opacity: 0.4;
}

/* -- Responsive -- */
@media (max-width: 768px) {
  .cs-hero-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .cs-hero-meta {
    align-items: flex-start;
    text-align: left;
  }

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

  .cs-deliverable {
    border-right: none !important;
  }

  .cs-deliverable:last-child { border-bottom: none; }

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

  .cs-cta-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .cs-stack-inner {
    flex-direction: column;
    gap: 1rem;
  }

  .cs-footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
}

@media (max-width: 480px) {
  .cs-hero-title {
    font-size: clamp(2.5rem, 13vw, 3.5rem);
  }

  .cs-nav-brand { display: none; }
}