/* ----------  Shared: case-study family  ---------- */
.cs-narrow {
  max-width: 780px;
}

.cs-eyebrow {
  display: inline-block;
  font-family: ui-monospace, 'SF Mono', Menlo, Monaco, Consolas, monospace;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--brand-1);
  margin: 0 0 20px;
}
.cs-eyebrow-sm {
  display: inline-block;
  font-family: ui-monospace, 'SF Mono', Menlo, Monaco, Consolas, monospace;
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--brand-1);
  margin: 0 0 16px;
}

.is-active { color: #fff !important; }

/* ----------  Index page  ---------- */
.cs-index {
  background: #FFFFFF;
  padding-bottom: 100px;
}

.cs-index-hero {
  padding: 64px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.cs-index-hero h1 {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: clamp(2.2rem, 4.5vw, 3.6rem);
  font-weight: 400;
  letter-spacing: -0.022em;
  line-height: 1.05;
  margin: 0 auto 22px;
  max-width: 780px;
}
.cs-index-lead {
  max-width: 620px;
  margin: 0 auto;
  color: var(--text-soft);
  font-size: 1.05rem;
  line-height: 1.55;
}

.cs-grid-section {
  padding-top: 56px;
}
.cs-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  max-width: 960px;
  margin: 0 auto;
}
.cs-card {
  display: grid;
  grid-template-columns: 260px 1fr;
  background: #fff;
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  color: inherit;
}
.cs-card:hover {
  transform: translateY(-2px);
  border-color: var(--brand-1);
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.06), 0 20px 40px rgba(14, 165, 233, 0.14);
}
.cs-card-media {
  background: #F8FAFC;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 24px;
  border-right: 1px solid var(--border);
}
.cs-card-media img {
  max-width: 100%;
  max-height: 88px;
  width: auto;
  height: auto;
  object-fit: contain;
}
.cs-card-body {
  padding: 30px 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.cs-card-tag {
  font-family: ui-monospace, 'SF Mono', Menlo, Monaco, Consolas, monospace;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brand-1);
  margin: 0;
}
.cs-card-title {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: clamp(1.4rem, 2.2vw, 1.7rem);
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.15;
  color: var(--text);
  margin: 0;
}
.cs-card-summary {
  color: var(--text-soft);
  font-size: 0.98rem;
  line-height: 1.55;
  margin: 0;
}
.cs-card-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin: 8px 0 4px;
  padding: 14px 0 0;
  border-top: 1px solid var(--border);
}
.cs-card-stats > div {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.cs-card-stat-value {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 1.2rem;
  color: var(--text);
  letter-spacing: -0.01em;
}
.cs-card-stat-label {
  font-size: 0.78rem;
  color: var(--text-dim);
}
.cs-card-link {
  font-family: ui-monospace, 'SF Mono', Menlo, Monaco, Consolas, monospace;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brand-1);
  margin-top: 4px;
}

@media (max-width: 720px) {
  .cs-index-hero { padding: 40px 0 28px; }
  .cs-grid-section { padding-top: 36px; }
  .cs-card { grid-template-columns: 1fr; }
  .cs-card-media { border-right: none; border-bottom: 1px solid var(--border); padding: 26px 20px; }
  .cs-card-media img { max-height: 68px; }
  .cs-card-body { padding: 24px 22px; }
  .cs-card-stats { gap: 18px; }
}

/* ----------  Individual case study page  ---------- */
.case-study {
  background: #FFFFFF;
  padding-bottom: 100px;
}

.cs-top {
  padding: 48px 0 32px;
  border-bottom: 1px solid var(--border);
}
.cs-back {
  display: inline-block;
  font-family: ui-monospace, 'SF Mono', Menlo, Monaco, Consolas, monospace;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin-bottom: 32px;
  transition: color 0.15s ease;
}
.cs-back:hover { color: var(--brand-1); }

.cs-title {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: clamp(2rem, 4.4vw, 3.2rem);
  font-weight: 400;
  letter-spacing: -0.022em;
  line-height: 1.06;
  margin: 0 0 32px;
  color: var(--text);
}

.cs-byline {
  display: flex;
  align-items: center;
  gap: 14px;
}
.cs-byline-avatar {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, #0B1220 0%, #1E1B4B 100%);
  padding: 5px;
}
.cs-byline-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin: 0;
}
.cs-byline-role {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin: 0;
}

/* Client banner */
.cs-banner {
  padding: 40px 0 24px;
}
.cs-banner-inner {
  background: #F8FAFC;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 56px 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cs-client-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.cs-client-link:hover { opacity: 0.85; transform: translateY(-1px); }
.cs-client-link:focus-visible {
  outline: 2px solid var(--brand-1);
  outline-offset: 8px;
  border-radius: 4px;
}
.cs-client-logo {
  max-width: 420px;
  max-height: 120px;
  width: auto;
  height: auto;
  object-fit: contain;
}

/* 3-column body layout */
.cs-body {
  padding: 32px 0 24px;
}
.cs-body-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 32px;
}
.cs-layout {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr) 240px;
  gap: 56px;
  align-items: start;
}
.cs-main {
  min-width: 0;
}

/* Sidebars (shared) */
.cs-sidebar {
  position: sticky;
  top: 96px;
  align-self: start;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  padding-right: 4px;
}
.cs-sidebar::-webkit-scrollbar { width: 4px; }
.cs-sidebar::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 2px; }

/* Left sidebar: client metadata */
.cs-sidebar-left .cs-meta-item {
  margin-bottom: 22px;
}
.cs-sidebar-left .cs-meta-item:last-child { margin-bottom: 0; }
.cs-meta-label {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.005em;
  color: var(--text);
  margin: 0 0 6px;
}
.cs-meta-value {
  font-size: 0.94rem;
  color: var(--text-soft);
  line-height: 1.55;
  margin: 0;
}

/* Right sidebar: On this page */
.cs-toc-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text);
  margin: 0 0 18px;
}
.cs-toc-title svg { width: 16px; height: 16px; color: var(--text-soft); }
.cs-toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-left: 1px solid var(--border);
}
.cs-toc-item a {
  display: block;
  padding: 8px 0 8px 16px;
  margin-left: -1px;
  font-size: 0.9rem;
  line-height: 1.35;
  color: var(--text-dim);
  border-left: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.cs-toc-item a:hover { color: var(--text); }
.cs-toc-item.is-active a {
  color: var(--text);
  font-weight: 600;
  border-left-color: var(--brand-1);
}

/* Key numbers (inside main column) */
.cs-numbers {
  padding: 0 0 8px;
}
.cs-numbers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding-top: 16px;
}
.cs-number {
  padding: 22px 4px;
  border-top: 2px solid var(--brand-1);
}
.cs-number-value {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: clamp(2rem, 3.6vw, 2.8rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1;
  margin: 0 0 12px;
}
.cs-number-label {
  font-size: 0.88rem;
  color: var(--text-soft);
  line-height: 1.45;
  margin: 0;
}

/* Problem / Approach / Outcomes */
.cs-summary {
  padding: 32px 0 16px;
}
.cs-summary-block {
  padding: 28px 0;
  border-top: 1px solid var(--border);
}
.cs-summary-block:last-child { border-bottom: 1px solid var(--border); }
.cs-summary-text {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  margin: 0;
}
.cs-summary-list {
  margin: 0;
  padding-left: 22px;
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
}
.cs-summary-list li { margin-bottom: 6px; }
.cs-summary-list li:last-child { margin-bottom: 0; }

/* Article body */
.cs-article {
  padding: 32px 0 20px;
}
.cs-article h2 {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: clamp(1.6rem, 2.6vw, 1.95rem);
  font-weight: 500;
  letter-spacing: -0.018em;
  line-height: 1.15;
  color: var(--text);
  margin: 44px 0 18px;
  scroll-margin-top: 88px;
}
.cs-article h2:first-child { margin-top: 0; }
.cs-article p {
  font-size: 1.06rem;
  line-height: 1.7;
  color: var(--text);
  margin: 0 0 20px;
}
.cs-article ul {
  padding-left: 22px;
  margin: 8px 0 22px;
  color: var(--text);
}
.cs-article li {
  font-size: 1.02rem;
  line-height: 1.65;
  margin-bottom: 10px;
}
.cs-article strong { font-weight: 600; }
.cs-outro {
  font-family: 'Source Serif 4', Georgia, serif;
  font-style: italic;
  font-size: clamp(1.15rem, 1.9vw, 1.35rem);
  line-height: 1.5;
  color: var(--text);
  border-left: 3px solid var(--brand-1);
  padding: 6px 0 6px 22px;
  margin: 28px 0 0;
}

/* Closing CTA */
.cs-cta {
  margin: 56px 0 0;
  padding: 40px 32px;
  background: linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 100%);
  border: 1px solid var(--border-strong);
  border-radius: 20px;
  text-align: center;
}
.cs-cta h3 {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: clamp(1.6rem, 2.8vw, 2.1rem);
  font-weight: 400;
  letter-spacing: -0.018em;
  margin: 8px 0 24px;
  color: var(--text);
}
.cs-cta .cs-eyebrow-sm { color: var(--text-dim); }
.cs-cta .pill-cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px 12px 12px;
  border-radius: 999px;
  background: var(--grad);
  color: #fff;
  border: none;
  font-weight: 600;
  font-size: 0.98rem;
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(99, 102, 241, 0.28);
}
.cs-cta .pill-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px; height: 30px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
}
.cs-cta .pill-icon svg { width: 14px; height: 14px; color: #fff; }

/* Hide right TOC on tablet-ish widths (keep left metadata sidebar) */
@media (max-width: 1100px) {
  .cs-body-container { padding: 0 24px; }
  .cs-layout { grid-template-columns: 180px minmax(0, 1fr); gap: 40px; }
  .cs-sidebar-right { display: none; }
}

/* Stack everything on mobile */
@media (max-width: 820px) {
  .cs-layout { grid-template-columns: 1fr; gap: 32px; }
  .cs-sidebar-left {
    position: static;
    max-height: none;
    overflow: visible;
    padding: 24px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px 32px;
  }
  .cs-sidebar-left .cs-meta-item { margin-bottom: 0; }
}

@media (max-width: 720px) {
  .cs-top { padding: 32px 0 24px; }
  .cs-back { margin-bottom: 22px; }
  .cs-banner { padding: 28px 0 16px; }
  .cs-banner-inner { padding: 36px 20px; border-radius: 12px; }
  .cs-body { padding: 24px 0 16px; }
  .cs-sidebar-left { grid-template-columns: 1fr; gap: 20px; }
  .cs-numbers-grid { grid-template-columns: 1fr; gap: 12px; }
  .cs-number { padding: 18px 4px; }
  .cs-article { padding: 24px 0 32px; }
  .cs-article h2 { margin: 32px 0 14px; }
  .cs-cta { padding: 32px 22px; margin-top: 40px; }
}