/* ── Case Study Summary Card ── */
.cs-summary {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 1.25rem 1.5rem;
  margin: 2rem 0 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 600px;
}
.cs-summary-row {
  display: flex;
  gap: 1.25rem;
}
.cs-summary-label {
  min-width: 5.5rem;
  font-weight: 600;
  color: var(--secondary);
  font-size: 0.95rem;
}
.cs-summary-value {
  color: var(--text);
  font-size: 0.95rem;
}
/* ============================================================
   PORTFOLIO — McKinsey visual style
   Full-width top nav · editorial serif · electric blue accent
============================================================ */

html {
  scroll-behavior: smooth;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

:root {
  --bg:           #FFFFFF;
  --surface:      #F5F5F5;
  --border:       #D5D5D5;
  --border-light: #E5E5E5;
  --text:         #000000;
  --secondary:    #444444;
  --tertiary:     #777777;

  /* McKinsey electric blue */
  --accent:       #2251FF;
  --accent-dark:  #051C2C;
  --accent-light: #E8EEFF;

  --nav-bg:       #051C2C;

  --shadow-sm:  0 1px 2px rgba(0,0,0,0.05);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.06);
  --shadow-card: 0 1px 4px rgba(0,0,0,0.04);
  --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.10);

  --radius:      4px;
  --radius-pill: 100px;

  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-serif: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;

  --header-h: 64px;
  --max-width: 1200px;
  --content-width: 1200px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

/* ── Accessibility ── */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ── Scroll reveal ── */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s cubic-bezier(.22,1,.36,1),
              transform 0.8s cubic-bezier(.22,1,.36,1);
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Skip link (screen-reader, visible on focus) ── */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
  z-index: 10000;
  background: var(--nav-bg);
  color: #fff;
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  border-radius: 0 0 4px 0;
}
.skip-link:focus {
  position: fixed;
  left: 0;
  top: 0;
  width: auto;
  height: auto;
  overflow: visible;
}

/* ── Page load entry ── */
main {
  animation: pageEnter 0.45s cubic-bezier(.22,1,.36,1) both;
}
@keyframes pageEnter {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Page exit transition ── */
body.page-exit {
  opacity: 0;
  transition: opacity 0.3s ease;
}

/* ── Nav scrim ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  z-index: 190;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
body.nav-open::before {
  opacity: 1;
  pointer-events: auto;
}

/* ============================================================
   TOP NAV BAR — fixed dark navy
============================================================ */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  background: rgba(5,28,44,0.55);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(1.5rem, 5vw, 3.5rem);
  padding-left: max(clamp(1.5rem, 5vw, 3.5rem), env(safe-area-inset-left));
  padding-right: max(clamp(1.5rem, 5vw, 3.5rem), env(safe-area-inset-right));
}

/* ── White glass nav on case study pages ── */
.cs-page .site-nav {
  background: rgba(255,255,255,0.55);
  backdrop-filter: blur(20px) saturate(1.6);
  -webkit-backdrop-filter: blur(20px) saturate(1.6);
  border-bottom: 1px solid rgba(0,0,0,0.06);
}

.cs-page .nav-name {
  color: var(--text);
}

.cs-page .nav-links a {
  color: var(--secondary);
}

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

.cs-page .nav-links .nav-cta {
  color: #FFFFFF;
  background: linear-gradient(135deg, #6B3DE8 0%, #2251FF 65%, #C07A3E 100%);
  border: none;
  border-radius: var(--radius-pill);
  box-shadow: none;
  padding: 0.5rem 1.5rem;
  transition: opacity 0.2s;
}

.cs-page .nav-links .nav-cta:hover {
  color: #FFFFFF;
  opacity: 0.85;
  background: linear-gradient(135deg, #6B3DE8 0%, #2251FF 65%, #C07A3E 100%);
  border-color: transparent;
  box-shadow: none;
}

.nav-name {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 400;
  color: rgba(255,255,255,0.7);
  transition: color 0.2s;
  letter-spacing: 0.01em;
}

.nav-links a:hover {
  color: #FFFFFF;
}

.nav-links .nav-cta {
  font-weight: 500;
  color: #FFFFFF;
  background: linear-gradient(135deg, rgba(100,60,220,0.2) 0%, rgba(34,81,255,0.15) 50%, rgba(255,170,50,0.12) 100%);
  border: 1px solid rgba(255,255,255,0.2);
  padding: 0.5rem 1.5rem;
  border-radius: var(--radius-pill);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.2),
    inset 0 0 12px rgba(255,255,255,0.04),
    0 1px 6px rgba(0,0,0,0.15);
  transition: background 0.25s, border-color 0.25s, box-shadow 0.25s;
}

.nav-links .nav-cta:hover {
  background: linear-gradient(135deg, rgba(100,60,220,0.35) 0%, rgba(34,81,255,0.28) 50%, rgba(255,170,50,0.2) 100%);
  border-color: rgba(255,255,255,0.35);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.3),
    inset 0 0 16px rgba(255,255,255,0.06),
    0 4px 14px rgba(0,0,0,0.2);
}

/* ── Mobile hamburger ── */
.nav-toggle {
  display: none;
  appearance: none;
  border: none;
  background: none;
  cursor: pointer;
  padding: 0.25rem;
  width: 28px;
  height: 24px;
  position: relative;
  z-index: 201;
}

.nav-toggle span {
  display: block;
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: #FFFFFF;
  border-radius: 2px;
  transition: transform 0.3s cubic-bezier(.22,1,.36,1),
              opacity 0.3s cubic-bezier(.22,1,.36,1);
}

.nav-toggle span:nth-child(1) { top: 2px; }
.nav-toggle span:nth-child(2) { top: 11px; }
.nav-toggle span:nth-child(3) { top: 20px; }

.nav-toggle.open span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.open span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

.cs-page .nav-toggle span {
  background: var(--text);
}

/* ============================================================
   LAYOUT — full-width, no sidebar
============================================================ */
.layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding-top: var(--header-h);
}

/* Hide old sidebar elements on index */
.sidebar { display: none; }

/* ============================================================
   HERO SECTION — dark navy, large serif headline
============================================================ */
.hero-section {
  background: var(--nav-bg);
  color: #FFFFFF;
  padding: clamp(3rem, 7vw, 5rem) 0 clamp(1.25rem, 3.75vw, 2.75rem);
  padding-top: calc(var(--header-h) + clamp(3rem, 7vw, 5rem) - 22px);
  margin-top: calc(-1 * var(--header-h));
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  inset: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(ellipse 45% 40% at 50% 15%, rgba(255,180,60,0.45) 0%, transparent 55%),
    radial-gradient(ellipse 50% 45% at 65% 30%, rgba(220,140,160,0.3) 0%, transparent 55%),
    radial-gradient(ellipse 60% 55% at 50% 50%, rgba(160,140,210,0.35) 0%, transparent 60%),
    radial-gradient(ellipse 55% 50% at 25% 60%, rgba(80,100,200,0.4) 0%, transparent 65%),
    radial-gradient(ellipse 50% 45% at 75% 65%, rgba(60,80,180,0.35) 0%, transparent 60%);
  animation: heroGradientDrift 14s ease-in-out infinite alternate;
  pointer-events: none;
  z-index: 0;
}

@keyframes heroGradientDrift {
  0%   { transform: translate(0, 0) rotate(0deg) scale(1); }
  33%  { transform: translate(-3%, 2%) rotate(2deg) scale(1.03); }
  66%  { transform: translate(2%, -3%) rotate(-2deg) scale(0.97); }
  100% { transform: translate(-2%, 3%) rotate(3deg) scale(1.02); }
}

.hero-inner {
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: clamp(1.5rem, 5vw, 3.5rem);
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: 1.5rem;
}

.hero-title {
  font-family: var(--font);
  font-size: clamp(2.25rem, 5.5vw, 3.75rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 960px;
  margin-bottom: 1.5rem;
}


.hero-desc {
  font-size: clamp(1rem, 1.5vw, 1.1875rem);
  font-weight: 400;
  line-height: 1.6;
  color: rgba(255,255,255,0.7);
  max-width: 600px;
  padding-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

/* ============================================================
   FILTER TABS — horizontal bar below hero
============================================================ */
.filter-bar {
  background: var(--bg);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: var(--header-h);
  z-index: 100;
  transition: box-shadow 0.3s ease;
}

.filter-bar.scrolled {
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}

.filter-inner {
  max-width: var(--content-width);
  margin-inline: auto;
  padding: 0 clamp(1.5rem, 5vw, 3.5rem);
  display: flex;
  gap: 0;
}

.role-tabs {
  display: flex;
  gap: 0;
  padding: 0;
  background: none;
  border: none;
}

.role-tab {
  appearance: none;
  border: none;
  background: none;
  color: var(--tertiary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 1rem 1.5rem;
  cursor: pointer;
  transition: color 0.2s;
  white-space: nowrap;
  position: relative;
  border-bottom: 2px solid transparent;
}

.role-tab:hover {
  color: var(--text);
  background: none;
}

.role-tab.active {
  color: var(--text);
  font-weight: 600;
  background: none;
  border-bottom: 2px solid var(--accent);
}

/* ============================================================
   CONTENT — projects area
============================================================ */
.content {
  flex: 1;
  background: var(--bg);
}

.projects-stage {
  max-width: var(--content-width);
  margin-inline: auto;
  padding: 3.5rem clamp(1.5rem, 5vw, 3.5rem) 5rem;
  scroll-margin-top: var(--header-h);
}

.projects-group {
  opacity: 0;
  transform: translateY(12px);
  animation: fadeUp 0.35s cubic-bezier(.22,1,.36,1) forwards;
}

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

/* ============================================================
   CARD — editorial McKinsey style
============================================================ */
.card {
  display: flex;
  flex-direction: column;
  border: none;
  border-radius: 0;
  background: var(--bg);
  overflow: hidden;
  transition: transform 0.3s ease;
  text-decoration: none;
  color: inherit;
}

.card:hover {
  transform: translateY(-2px);
}

.card-thumb {
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--surface);
}

.card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(.22,1,.36,1);
}

.card:hover .card-thumb img {
  transform: scale(1.04);
}

.card-body {
  padding: 1.25rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}

.card-meta {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--tertiary);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.015em;
  line-height: 1.3;
  transition: color 0.2s;
}

.card:hover .card-title {
  color: var(--accent);
}

.card-desc {
  font-size: 0.9375rem;
  font-weight: 400;
  color: var(--secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-top: auto;
  padding-top: 0.75rem;
}

.p-tag {
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--secondary);
  background: var(--surface);
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius);
  border: none;
}

/* badge */
.project-badge {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--accent);
  background: var(--accent-light);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius);
  vertical-align: middle;
  margin-left: 0.35rem;
  position: relative;
  top: -1px;
}

/* ============================================================
   TESTIMONIALS — horizontal strip above footer
============================================================ */
.testimonials {
  background: var(--nav-bg);
  color: #FFFFFF;
  padding: clamp(3.5rem, 7vw, 5rem) clamp(1.5rem, 5vw, 3.5rem);
}

.testimonials-inner {
  max-width: var(--content-width);
  margin-inline: auto;
}

.testimonials-label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 2.5rem;
  font-family: var(--font);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.testimonial {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.testimonial-quote {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.65;
  color: rgba(255,255,255,0.85);
  font-style: italic;
}

.testimonial-author {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  margin-top: auto;
}

.testimonial-name {
  font-size: 0.8125rem;
  font-weight: 600;
  color: #FFFFFF;
  font-family: var(--font);
}

.testimonial-role {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.45);
  font-family: var(--font);
}

.testimonial-link {
  color: rgba(255,255,255,0.65);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.2s;
}
.testimonial-link:hover {
  color: #FFFFFF;
}

@media (max-width: 768px) {
  .testimonials-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* ============================================================
   CTA SECTION — full-width dark band
============================================================ */
.cta-section {
  background: var(--nav-bg);
  color: #FFFFFF;
  padding: clamp(3rem, 7vw, 5rem) clamp(1.5rem, 5vw, 3.5rem);
}

.cta-inner {
  max-width: var(--content-width);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.cta-text h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.cta-text p {
  font-size: 1rem;
  color: rgba(255,255,255,0.65);
  max-width: 420px;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-weight: 500;
  color: #FFFFFF;
  background: var(--accent);
  transition: background 0.2s;
  cursor: pointer;
  text-align: center;
  white-space: nowrap;
}

.cta-btn:hover { background: #1A42D9; }

/* ============================================================
   SITE FOOTER — dark navy
============================================================ */
.site-footer {
  background: var(--surface);
  color: var(--tertiary);
  padding: 2rem clamp(1.5rem, 5vw, 3.5rem);
  padding-bottom: max(2rem, env(safe-area-inset-bottom));
  font-size: 0.8125rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-light);
}

.site-footer a {
  color: var(--secondary);
  transition: color 0.2s;
}

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

/* ============================================================
   RESPONSIVE
============================================================ */

/* Tablet */
@media (max-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.75rem;
  }
}

/* Mobile */
@media (max-width: 768px) {
  .nav-links {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: calc(100vh - var(--header-h));
    height: calc(100dvh - var(--header-h));
    background: rgba(3, 17, 28, 0.98);
    backdrop-filter: blur(24px) saturate(1.6);
    -webkit-backdrop-filter: blur(24px) saturate(1.6);
    padding: 0;
    gap: 0;
    border-top: 1px solid rgba(255,255,255,0.07);
    overflow-y: auto;
    overflow-x: hidden;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s cubic-bezier(.22,1,.36,1);
  }
  .nav-links.open {
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 1rem;
    font-weight: 400;
    color: rgba(255,255,255,0.6);
    padding: 1.125rem 1.75rem;
    border-bottom: 1px solid rgba(255,255,255,0.07);
    opacity: 0;
    transform: translateY(-6px);
    transition: opacity 0.3s ease, transform 0.3s ease, color 0.2s;
  }
  .nav-links a:hover { color: #fff; }
  .nav-links.open a {
    opacity: 1;
    transform: translateY(0);
  }
  .nav-links.open > *:nth-child(1) { transition-delay: 0.04s; }
  .nav-links.open > *:nth-child(2) { transition-delay: 0.08s; }
  .nav-links.open > *:nth-child(3) { transition-delay: 0.12s; }
  .nav-links.open > *:nth-child(4) { transition-delay: 0.16s; }

  .nav-links .nav-cta {
    margin-top: auto;
    margin-bottom: max(1.75rem, env(safe-area-inset-bottom));
    width: calc(100% - 3.5rem);
    align-self: center;
    border-bottom: none;
    padding: 0.875rem 1.5rem;
    min-height: 48px;
    background: linear-gradient(135deg, #6B3DE8 0%, #2251FF 65%, #C07A3E 100%);
    border: none;
    border-radius: var(--radius-pill);
    color: #fff;
    font-weight: 600;
    font-size: 0.9375rem;
    justify-content: center;
    text-align: center;
    box-shadow: 0 4px 20px rgba(34,81,255,0.32);
  }

  .cs-page .nav-links {
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(24px) saturate(1.8);
    -webkit-backdrop-filter: blur(24px) saturate(1.8);
    border-top: 1px solid rgba(0,0,0,0.06);
  }
  .cs-page .nav-links a {
    color: var(--secondary);
    border-bottom-color: rgba(0,0,0,0.07);
  }
  .cs-page .nav-links a:hover { color: var(--text); }
  .cs-page .nav-links .nav-cta { color: #fff; }

  /* Solid white nav bar when dropdown is open on case study pages */
  .cs-page .site-nav:has(.nav-links.open) {
    background: #FFFFFF;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .nav-toggle { display: block; }

  .hero-title {
    font-size: clamp(1.75rem, 6vw, 2.5rem);
  }
  .hero-section {
    padding-top: calc(var(--header-h) + clamp(3rem, 7vw, 5rem) + 6px);
  }

  .filter-inner {
    overflow-x: auto;
    scrollbar-width: none;
  }
  .filter-inner::-webkit-scrollbar { display: none; }

  .role-tab {
    font-size: 0.8125rem;
    padding: 0.875rem 1rem;
    min-height: 44px;
  }

  .projects-stage {
    padding: 2rem 1.25rem 3rem;
  }

  .projects-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .cta-inner {
    flex-direction: column;
    text-align: center;
  }

  .cta-text p {
    margin-inline: auto;
  }

  .site-footer {
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
  }

  .card-title {
    font-size: 1.0625rem;
  }

  .card-desc {
    -webkit-line-clamp: 6;
  }

}

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .projects-group {
    animation: none;
    opacity: 1;
    transform: none;
  }
  .card {
    transition: none;
  }
  .hero-section::before {
    animation: none;
  }
}

/* ── Next project navigation ── */
.cs-next-project {
  max-width: 760px;
  margin-inline: auto;
  padding: 4rem 1.5rem 3rem;
  border-top: 1px solid var(--border-light);
  margin-top: 4rem;
}

.cs-next-label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--tertiary);
  margin-bottom: 0.75rem;
  font-family: var(--font);
}

.cs-next-link {
  display: block;
  text-decoration: none;
  color: inherit;
  transition: color 0.2s;
}

.cs-next-link:hover {
  color: var(--accent);
}

.cs-next-title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.cs-next-desc {
  font-size: 0.9375rem;
  color: var(--secondary);
  line-height: 1.55;
  max-width: 520px;
  font-family: var(--font);
}

.cs-next-link:hover .cs-next-title {
  color: var(--accent);
}

.cs-next-arrow {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent);
  font-family: var(--font);
}

/* ============================================================
   CASE STUDY / ARTICLE PAGES — McKinsey editorial layout
   Narrow centered column · serif body text · generous whitespace
============================================================ */

/* ── Article header ── */
.cs-header {
  max-width: 760px;
  margin-inline: auto;
  padding: calc(var(--header-h) + 4rem) clamp(1.25rem, 5vw, 2rem) 0;
}



.cs-eyebrow {
  font-family: var(--font);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.cs-title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--text);
  margin-bottom: 1.25rem;
}

.cs-sub {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  color: var(--secondary);
  line-height: 1.65;
  margin-bottom: 2.25rem;
}

.cs-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  padding: 1rem 0;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 3rem;
  align-items: baseline;
}

.cs-meta-item {
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
}

.cs-meta-label {
  font-family: var(--font);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--tertiary);
}

.cs-meta-value {
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
}

.cs-meta-dot {
  color: var(--border);
  font-size: 0.75rem;
  user-select: none;
}

/* ── Article body ── */
.cs-body {
  max-width: 760px;
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 2rem);
  padding-bottom: 5rem;
}

.cs-section {
  margin-bottom: 3rem;
}

.cs-section-label {
  font-family: var(--font);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.cs-section h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 1rem;
}

.cs-section p {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  color: var(--secondary);
  line-height: 1.75;
  margin-bottom: 1rem;
}

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

/* ── Lists inside sections ── */
.cs-section ul,
.cs-section ol {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  color: var(--secondary);
  line-height: 1.75;
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.cs-section li {
  margin-bottom: 0.5rem;
}

.cs-section li strong {
  color: var(--text);
}

/* ── Callout ── */
.cs-callout {
  background: var(--surface);
  border-left: 3px solid var(--accent);
  padding: 1.5rem 2rem;
  border-radius: 0 4px 4px 0;
  margin: 2rem 0;
}

.cs-callout p {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  color: var(--text);
  line-height: 1.65;
  font-weight: 500;
  margin: 0;
}

/* ── Figure ── */
.cs-figure {
  margin: 2rem 0;
}

.cs-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
}

.cs-figure figcaption {
  font-size: 0.8125rem;
  color: var(--tertiary);
  margin-top: 0.5rem;
  line-height: 1.5;
  font-family: var(--font);
}

/* ── Part dividers ── */
.cs-part-divider {
  margin: 4rem 0 2.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border-light);
}

.cs-part-divider h2 {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}

/* ── Tables ── */
.cs-table-wrap {
  overflow-x: auto;
  margin: 1.5rem 0 2rem;
}

.cs-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  font-family: var(--font);
}

.cs-table th {
  text-align: left;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--tertiary);
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-light);
  white-space: nowrap;
}

.cs-table td {
  padding: 0.75rem 1rem;
  color: var(--secondary);
  border-bottom: 0.5px solid var(--border-light);
  vertical-align: top;
  line-height: 1.55;
}

.cs-table td:first-child {
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}

/* ── Funnel / stat rows ── */
.cs-funnel {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 1.5rem 0 2rem;
}

.cs-funnel-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.875rem 0;
  border-bottom: 0.5px solid var(--border-light);
  font-family: var(--font);
}

.cs-funnel-row:first-child {
  border-top: 0.5px solid var(--border-light);
}

.cs-funnel-stage {
  font-size: 0.875rem;
  color: var(--secondary);
}

.cs-funnel-num {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
}

/* ── Metrics row ── */
.cs-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin: 2rem 0 3rem;
}

.cs-metric {
  padding: 1.5rem;
  background: var(--surface);
  border-radius: 4px;
}

.cs-metric-number {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
  line-height: 1;
  margin-bottom: 0.4rem;
  font-family: var(--font);
}

.cs-metric-label {
  font-size: 0.8125rem;
  color: var(--secondary);
  line-height: 1.45;
  font-family: var(--font);
}

/* ── Feature cards ── */
.cs-features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin: 1.75rem 0;
}

.cs-feature {
  padding: 0;
  background: none;
  border-radius: 0;
}

.cs-feature-num {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
  font-family: var(--font);
}

.cs-feature h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
  line-height: 1.3;
  font-family: var(--font);
}

.cs-feature p {
  font-size: 1rem;
  color: var(--secondary);
  line-height: 1.6;
  margin: 0;
  font-family: var(--font);
}

/* ── Archetype cards ── */
.cs-archetypes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1.5rem 0;
}

.cs-archetype {
  padding: 1.5rem;
  background: var(--surface);
  border-radius: 4px;
}

.cs-archetype-label {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.4rem;
  font-family: var(--font);
}

.cs-archetype-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
  font-family: var(--font);
}

.cs-archetype p {
  font-size: 0.875rem;
  color: var(--secondary);
  line-height: 1.55;
  margin: 0;
  font-family: var(--font);
}

/* ── Findings list ── */
.cs-findings {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 1.5rem 0;
}

.cs-finding {
  padding: 1.25rem 0;
  border-bottom: 0.5px solid var(--border-light);
}

.cs-finding:first-child {
  border-top: 0.5px solid var(--border-light);
}

.cs-finding h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.35rem;
  letter-spacing: -0.01em;
  font-family: var(--font);
}

.cs-finding p {
  font-size: 0.9375rem;
  color: var(--secondary);
  line-height: 1.6;
  margin: 0;
  font-family: var(--font-serif);
}

/* ── Validation table ── */
.cs-validation {
  margin: 1.5rem 0;
}

.cs-val-row {
  display: grid;
  grid-template-columns: 1fr 5rem 5rem;
  gap: 1rem;
  align-items: center;
  padding: 0.75rem 0;
  border-bottom: 0.5px solid var(--border-light);
  font-size: 0.875rem;
  font-family: var(--font);
}

.cs-val-row:first-child {
  border-top: 0.5px solid var(--border-light);
}

.cs-val-criterion {
  color: var(--text);
  font-weight: 500;
}

.cs-val-header {
  color: var(--tertiary);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.cs-pass {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: #1a7a4a;
}

.cs-fail {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: #b0350f;
}

/* ── Tags ── */
.cs-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.cs-tag {
  font-size: 0.6875rem;
  font-weight: 500;
  font-family: var(--font);
  color: var(--tertiary);
  padding: 0.25rem 0.625rem;
  border: 0.5px solid var(--border);
  border-radius: 3px;
}

/* ── Sources ── */
.cs-sources {
  margin-top: 2rem;
}

.cs-sources summary {
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font);
  color: var(--tertiary);
  cursor: pointer;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.cs-sources ol {
  margin-top: 0.75rem;
  padding-left: 1.25rem;
  font-size: 0.8125rem;
  font-family: var(--font);
  color: var(--secondary);
  line-height: 1.8;
}

/* ── Case study responsive ── */
@media (max-width: 640px) {
  .cs-title { font-size: 1.75rem; }
  .cs-sub { font-size: 1rem; }
  .cs-section p { font-size: 1rem; }
  .cs-section ul,
  .cs-section ol { font-size: 1rem; }
  .cs-features,
  .cs-archetypes { grid-template-columns: 1fr; }
  .cs-val-row { grid-template-columns: 1fr 4rem 4rem; }

  /* ── Metadata: 2-column grid ── */
  .cs-meta {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }
  .cs-meta-dot { display: none; }
  .cs-meta-item {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
  }

  /* ── Metrics: compact horizontal strip ── */
  .cs-metrics {
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    background: var(--surface);
    border-radius: 8px;
    overflow: hidden;
    margin: 1.5rem 0 2.5rem;
  }
  .cs-metric {
    padding: 1rem 0.75rem;
    background: none;
    border-radius: 0;
    text-align: center;
    border-right: 1px solid var(--border-light);
  }
  .cs-metric:last-child { border-right: none; }
  .cs-metric-number {
    font-size: 1.375rem;
  }
  .cs-metric-label {
    font-size: 0.6875rem;
    line-height: 1.35;
  }

  /* ── Tables: card layout on mobile ── */
  .cs-table thead { display: none; }
  .cs-table,
  .cs-table tbody,
  .cs-table tr,
  .cs-table td {
    display: block;
    width: 100%;
  }
  .cs-table tr {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-light);
  }
  .cs-table tr:last-child { border-bottom: none; }
  .cs-table tr[style] {
    background: var(--accent-light) !important;
    border-radius: 8px;
    padding: 1rem;
    margin-top: 0.5rem;
  }
  .cs-table td {
    padding: 0.2rem 0;
    border-bottom: none;
    white-space: normal;
  }
  .cs-table td:first-child {
    white-space: normal;
    font-size: 0.9375rem;
    margin-bottom: 0.25rem;
  }
  .cs-table td::before {
    content: attr(data-label);
    display: block;
    font-size: 0.625rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--tertiary);
    margin-bottom: 0.1rem;
  }
  .cs-table td:first-child::before { content: none; }

  /* ── Source links ── */
  .cs-sources a {
    font-size: 0.875rem;
    line-height: 1.5;
    display: block;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-light);
    color: var(--accent);
  }
  .cs-sources p { margin: 0; }
}