/* ============================================================
   Case study page template
   Used by all /case-studies/*.html pages.
   ============================================================ */

.cs-hero {
  padding: 80px 0 96px;
  border-bottom: 1px solid var(--surface-border);
}
.cs-hero .breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-kicker);
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 48px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.cs-hero .breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
}
.cs-hero .breadcrumb a:hover { color: var(--text-primary); }
.cs-hero .breadcrumb span { color: var(--text-primary); }

.cs-hero .eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-kicker);
  text-transform: uppercase;
  color: var(--text-emphasis);
  margin-bottom: 24px;
  display: block;
}

.cs-hero h1 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(40px, 6.4vw, 96px);
  line-height: 1.02;
  letter-spacing: var(--ls-tight);
  margin: 0;
  max-width: 1100px;
}

.cs-hero .deck {
  margin-top: 32px;
  font-size: var(--fs-body-lg);
  line-height: 1.45;
  color: var(--text-secondary);
  max-width: 760px;
}

.cs-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--surface-border);
}
@media (max-width: 760px) {
  .cs-meta { grid-template-columns: 1fr 1fr; gap: 24px; }
}
.cs-meta dt {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-kicker);
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.cs-meta dd {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  color: var(--text-primary);
  line-height: 1.4;
}

/* ---------- Body sections ---------- */
.cs-body {
  padding: 96px 0;
  border-bottom: 1px solid var(--surface-border);
}
.cs-body .wrap {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 64px;
  align-items: start;
}
@media (max-width: 880px) {
  .cs-body { padding: 64px 0; }
  .cs-body .wrap { grid-template-columns: 1fr; gap: 32px; }
}

.cs-section-label {
  position: sticky;
  top: 100px;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-kicker);
  text-transform: uppercase;
  color: var(--text-secondary);
}
@media (max-width: 880px) {
  .cs-section-label { position: static; }
}

.cs-prose {
  max-width: 760px;
}
.cs-prose h2 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(32px, 3.6vw, 48px);
  line-height: 1.1;
  letter-spacing: var(--ls-snug);
  margin: 0 0 24px;
  color: var(--text-primary);
}
.cs-prose h3 {
  font-family: 'General Sans', var(--font-sans), sans-serif;
  font-weight: 600;
  font-size: clamp(20px, 1.8vw, 24px);
  line-height: 1.3;
  letter-spacing: -0.008em;
  margin: 48px 0 16px;
  color: var(--text-primary);
}
.cs-prose p {
  margin: 0 0 20px;
  font-size: 18px;
  line-height: 1.65;
  color: var(--text-primary);
}
.cs-prose p.lede {
  font-size: 22px;
  line-height: 1.5;
  color: var(--text-primary);
  margin-bottom: 32px;
}
.cs-prose ul {
  margin: 16px 0 24px;
  padding-left: 24px;
}
.cs-prose ul li {
  margin-bottom: 10px;
  font-size: 17px;
  line-height: 1.55;
  color: var(--text-primary);
}
.cs-prose ul li::marker { color: var(--text-emphasis); }
.cs-prose strong { font-weight: 600; }
.cs-prose em { font-style: italic; }

.cs-figure {
  margin: 48px 0;
  border: 1px solid var(--surface-border);
  background: var(--surface-secondary);
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}
.cs-figure .fig-label {
  font-weight: 500;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: var(--ls-kicker);
  margin-bottom: 8px;
  display: block;
}
.cs-figure .placeholder {
  margin: 16px 0;
  aspect-ratio: 16 / 9;
  background: repeating-linear-gradient(
    45deg,
    transparent 0 8px,
    rgba(0, 0, 0, 0.04) 8px 16px
  );
  border: 1px dashed var(--surface-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
}

/* ---------- Takeaways callout ---------- */
.cs-takeaway {
  background: var(--surface-secondary);
  border-left: var(--bw-6) solid var(--accent-voltage);
  padding: 32px;
  margin: 48px 0;
}
.cs-takeaway .label {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-kicker);
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 12px;
  display: block;
}
.cs-takeaway p {
  font-family: 'General Sans', var(--font-sans), sans-serif;
  font-weight: 500;
  font-size: clamp(18px, 1.6vw, 22px);
  line-height: 1.45;
  margin: 0;
  color: var(--text-primary);
  letter-spacing: -0.002em;
}

/* ---------- Cross-link to next case study + CTA ---------- */
.cs-closer {
  padding: 96px 0;
}
.cs-closer h2 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(32px, 4vw, 56px);
  line-height: 1.1;
  letter-spacing: var(--ls-snug);
  margin: 0 0 32px;
  max-width: 760px;
}
.cs-closer .actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 24px;
}

/* ---------- WIP banner for stub pages ---------- */
.cs-wip {
  border: 1px dashed var(--surface-border);
  background: var(--surface-secondary);
  padding: 32px;
  margin-top: 48px;
}
.cs-wip .label {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-kicker);
  text-transform: uppercase;
  color: var(--text-emphasis);
  margin-bottom: 12px;
  display: block;
}
.cs-wip p {
  margin: 0;
  font-size: 17px;
  color: var(--text-primary);
  line-height: 1.5;
}

/* ============================================================
   Shared site nav (PM-style), used across all case study pages.
   Mirrors the inline .site-nav in peakmetrics.html.
   ============================================================ */
.site-nav {
  width: 100%;
  margin: 0;
  padding: 24px 48px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
}
.site-nav .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.site-nav .brand img { height: 28px; width: auto; display: block; }
.site-nav .brand .wordmark {
  font-family: 'General Sans', sans-serif;
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-red);
}
.site-nav .nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
}
.site-nav .nav-links a {
  font-family: 'General Sans', sans-serif;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: normal;
  text-transform: none;
  color: var(--color-slate);
  text-decoration: none;
}
.site-nav .nav-links a:hover { color: var(--color-ink); }
.site-nav .nav-links a.current { color: var(--color-ink); }
.site-nav .nav-links a.current::after {
  content: '';
  display: block;
  height: 2px;
  background: var(--color-sodium);
  margin-top: 2px;
  border-radius: 9999px;
}
.site-nav .nav-links .nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  background: var(--color-red);
  color: var(--color-bone);
  border-radius: 9999px;
  font-weight: 600;
  font-size: 13px;
}
.site-nav .nav-links .nav-cta:hover { background: var(--color-red-deep); color: var(--color-bone); }
.site-nav .nav-links .nav-cta .pulse {
  width: 7px;
  height: 7px;
  background: var(--color-bone);
  border-radius: 50%;
  animation: pulseRingNav 1.8s ease-in-out infinite;
}
@keyframes pulseRingNav {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(1.3); }
}
.site-nav .menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-line-paper);
  border-radius: 9999px;
  background: transparent;
  color: var(--color-ink);
  cursor: pointer;
}
.site-nav .menu-toggle svg { width: 18px; height: 18px; }
@media (max-width: 720px) {
  .site-nav { padding: 20px 24px; }
  .site-nav .nav-links { display: none; }
  .site-nav .menu-toggle { display: inline-flex; }
}

/* ============================================================
   Shared dark rounded footer, used across all case study pages.
   Mirrors the inline .foot in peakmetrics.html.
   ============================================================ */
.cs-foot {
  margin: 80px 0 0;
  background: var(--color-ink);
  color: var(--color-bone);
  border: none;
  border-radius: 40px 40px 0 0;
  padding: 72px 48px 56px;
}
.cs-foot .foot-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  align-items: end;
  font-family: 'General Sans', sans-serif;
  font-size: 13px;
  color: var(--color-bone);
}
.cs-foot .foot-col {
  display: flex;
  flex-direction: column;
  gap: 22px;
  align-items: flex-start;
}
.cs-foot .foot-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  font-size: 13px;
  color: rgba(244, 248, 247, 0.7);
}
.cs-foot .foot-legal span { color: rgba(244, 248, 247, 0.7); }
.cs-foot .foot-legal a {
  color: rgba(244, 248, 247, 0.7);
  text-decoration: none;
}
.cs-foot .foot-legal a:hover { color: var(--color-bone); }
.cs-foot .foot-legal .sep { color: rgba(244, 248, 247, 0.25); }
.cs-foot .lockup {
  display: flex;
  align-items: center;
  gap: 10px;
}
.cs-foot .lockup img { width: 24px; height: 24px; display: block; }
.cs-foot .lockup .wordmark {
  font-family: 'General Sans', sans-serif;
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-red);
}
.cs-foot .clutch-widget {
  background: #FFFFFF;
  border-radius: 10px;
  padding: 6px 14px;
  display: inline-flex;
  align-items: center;
  min-height: 45px;
  width: fit-content;
  line-height: 1;
}
.cs-foot .clutch-widget iframe { display: block; }
@media (max-width: 720px) {
  .cs-foot { padding: 56px 24px 40px; border-radius: 24px 24px 0 0; }
  .cs-foot .foot-inner { grid-template-columns: 1fr; gap: 36px; }
}