/* css/case-study.css */

.cs-page #nav {
  border-bottom: 1px solid var(--color-border-dark);
  background: rgba(10,10,10,0.95);
}

.cs-page .nav__logo {
  color: var(--color-text-on-dark);
}

.nav__back {
  font-size: var(--text-sm);
  color: var(--color-text-muted-dark);
  transition: color var(--ease-fast);
}
.nav__back:hover { color: var(--color-cobalt); }

/* ── Case study header ── */
.cs-header {
  background: var(--color-bg-dark);
  padding-block: clamp(4rem, 8vw, 7rem);
}

.cs-header__eyebrow {
  margin-bottom: var(--sp-4);
}

.cs-header__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text-on-dark);
  line-height: 1.1;
  margin-bottom: var(--sp-6);
  max-width: 800px;
}

.cs-header__summary {
  font-size: var(--text-xl);
  color: var(--color-text-muted-dark);
  max-width: 640px;
  line-height: 1.55;
  margin-bottom: var(--sp-8);
}

.cs-header__meta {
  display: flex;
  gap: var(--sp-12);
  flex-wrap: wrap;
}

.cs-header__meta dt {
  margin-bottom: var(--sp-1);
}

.cs-header__meta dd {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text-on-dark);
}

/* ── Case study body ── */
.cs-body {
  padding-block: var(--section-py);
  background: var(--color-bg-light);
}

.cs-content {
  max-width: 720px;
}

.cs-section {
  margin-bottom: var(--sp-16);
}

.cs-section__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-on-light);
  margin-bottom: var(--sp-4);
  padding-bottom: var(--sp-3);
  border-bottom: 2px solid var(--color-cobalt);
  display: inline-block;
}

.cs-section p,
.cs-section ul,
.cs-section ol {
  font-size: var(--text-base);
  color: var(--color-text-on-light);
  line-height: 1.75;
  margin-bottom: var(--sp-4);
}

.cs-section ul,
.cs-section ol {
  padding-left: var(--sp-6);
}

.cs-section ul li { list-style: disc; }
.cs-section ol li { list-style: decimal; }

/* ── Sub-headings within sections ── */
.cs-section h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-on-light);
  margin-top: var(--sp-8);
  margin-bottom: var(--sp-3);
}

/* ── Data table ── */
.cs-table-wrapper {
  overflow-x: auto;
  margin-block: var(--sp-6);
}

.cs-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.cs-table th,
.cs-table td {
  text-align: left;
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text-on-light);
}

.cs-table th {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted-light);
  background: rgba(0,0,0,0.03);
}

.cs-table tbody tr:hover {
  background: rgba(26, 79, 214, 0.04);
}

/* ── Footer nav ── */
.cs-nav-footer {
  background: var(--color-bg-white);
  border-top: 1px solid var(--color-border-light);
  padding-block: var(--sp-8);
}

.cs-nav-footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cs-nav-footer__back,
.cs-nav-footer__next {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted-light);
  transition: color var(--ease-fast);
}

.cs-nav-footer__back:hover,
.cs-nav-footer__next:hover { color: var(--color-cobalt); }