/* ============================================================================
   codalume.com — case studies
   Investor-format case studies (problem → decision → cost → what it proves).
   Mobile-first. Depends on the tokens and base classes in site.css; loaded
   only on the case-studies page (injected via the template's scripts block).
   ========================================================================== */

/* hero */
.cs-hero {
  max-width: 70ch;
  padding-block: clamp(1rem, 4vw, 2.5rem) clamp(1.5rem, 5vw, 2.5rem);
}

.cs-hero > * + * {
  margin-top: 1.1rem;
}

/* index cards */
.cs-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: var(--gap);
}

.cs-card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 1.15rem 1.2rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.cs-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.cs-card__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.cs-card__k {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--accent-dim);
}

.cs-card__t {
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--text);
}

.cs-card__d {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--muted);
}

.cs-card__foot {
  margin-top: auto;
  padding-top: 0.4rem;
}

.cs-card__foot a {
  text-decoration: none;
}

.cs-card__foot a:hover {
  text-decoration: underline;
}

/* single case study */
.cs-case {
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.cs-back {
  margin-bottom: 1.25rem;
  font-family: var(--mono);
  font-size: 0.78rem;
}

.cs-back a {
  color: var(--muted);
  text-decoration: none;
}

.cs-back a:hover {
  color: var(--accent);
}

.cs-case__head {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  max-width: 70ch;
  margin-bottom: clamp(1.25rem, 3vw, 1.75rem);
}

.cs-case__tagline {
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  color: var(--muted);
  text-wrap: pretty;
}

/* the tension — the two things that could not both be true */
.cs-tension {
  display: grid;
  gap: 0.45rem;
  padding: 1rem 1.1rem;
  margin-bottom: var(--gap);
  border: 1px solid color-mix(in srgb, var(--amber) 35%, transparent);
  border-left-width: 3px;
  border-radius: var(--radius-sm);
  background: rgba(240, 180, 41, 0.06);
}

.cs-tension__k {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
}

.cs-tension__t {
  font-size: 0.95rem;
  color: var(--text);
  text-wrap: pretty;
}

/* the four steps */
.cs-flow {
  display: grid;
  gap: var(--gap);
}

.cs-step {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 1.15rem 1.2rem 1.3rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
}

.cs-step__k {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-dim);
}

.cs-step__p {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--muted);
  text-wrap: pretty;
}

.cs-step__p + .cs-step__p {
  margin-top: 0.6rem;
}

.cs-step--verdict {
  border-color: color-mix(in srgb, var(--accent) 35%, transparent);
  background: linear-gradient(
    180deg,
    color-mix(in srgb, var(--accent) 6%, var(--panel-2)),
    var(--panel)
  );
}

.cs-step--verdict .cs-step__p {
  color: var(--text);
}

/* source notes */
.cs-sources {
  display: grid;
  gap: 0.5rem;
  margin-top: clamp(1rem, 3vw, 1.5rem);
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.24);
}

.cs-sources__k {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dim);
}

.cs-sources ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.9rem;
}

.cs-sources code {
  font-size: 0.74rem;
  color: var(--muted);
}

/* ≥640px: the four steps read as 2×2, verdict full-width */
@media (min-width: 640px) {
  .cs-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cs-step--verdict {
    grid-column: span 2;
  }
}