/* ============================================================
   Case study — builder/terminal aesthetic
   Extends styles.css (Paper & Pine) with case-page chrome
   ============================================================ */

.case-back {
  font-family: var(--font-mono);
  font-size: 13.5px;
  font-weight: 500;
  color: var(--ink-2);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  margin-top: 28px;
  transition: color 0.15s, gap 0.15s;
}
.case-back::before { content: "←"; color: var(--accent); }
.case-back:hover { color: var(--accent); gap: 12px; }

/* ---------- Case hero ---------- */
.case-hero {
  padding-top: clamp(48px, 7vw, 72px);
  padding-bottom: clamp(56px, 8vw, 88px);
}
.case-hero .term-label { margin-bottom: 28px; }

.case-title {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: clamp(56px, 9vw, 120px);
  letter-spacing: -0.045em;
  line-height: 0.92;
  color: var(--ink);
  margin: 0 0 32px;
  text-wrap: balance;
}
.case-title .hi {
  color: var(--accent);
}
.case-title .dot {
  color: var(--accent);
}

.case-summary {
  font-size: clamp(18px, 2vw, 24px);
  color: var(--ink-2);
  max-width: 52ch;
  line-height: 1.45;
  margin: 0 0 36px;
  text-wrap: pretty;
}
.case-summary strong {
  color: var(--ink);
  font-weight: 500;
}

/* Meta row: client / role / window */
.case-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-top: 12px;
}
.case-meta-cell {
  padding: 20px 24px 20px 24px;
  border-right: 1px solid var(--line);
}
.case-meta-cell:first-child { padding-left: 0; }
.case-meta-cell:last-child { border-right: none; padding-right: 0; }
.case-meta-cell .k {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--ink-3);
  margin-bottom: 6px;
}
.case-meta-cell .k::before { content: "→ "; color: var(--accent); }
.case-meta-cell .v {
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
}
@media (max-width: 760px) {
  .case-meta { grid-template-columns: repeat(2, 1fr); }
  .case-meta-cell { border-bottom: 1px solid var(--line); padding-right: 24px; padding-left: 24px; }
  .case-meta-cell:nth-child(odd) { padding-left: 0; }
  .case-meta-cell:nth-child(even) { border-right: none; }
  .case-meta-cell:nth-last-child(-n+2) { border-bottom: none; }
}

/* ---------- Case blocks ---------- */
.case-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: clamp(64px, 9vw, 96px);
}

.case-block {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  transition: border-color 0.2s;
}
.case-block:hover { border-color: var(--line-strong); }

.case-block-head {
  padding: 16px 24px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-2);
}
.case-block-head .path { color: var(--ink-2); font-weight: 500; }
.case-block-head .path .slug { color: var(--accent); }
.case-block-head .num { color: var(--ink-3); font-weight: 500; }
.case-block-head .num .key { color: var(--accent); font-weight: 600; }

.case-block-body {
  padding: 32px 28px 28px;
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 40px;
}
@media (max-width: 820px) {
  .case-block-body { grid-template-columns: 1fr; gap: 18px; }
}

.case-block h3 {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 600;
  letter-spacing: -0.028em;
  line-height: 1.08;
  color: var(--ink);
  margin: 0;
  text-wrap: balance;
}
.case-block h3 .hi { color: var(--accent); }

.case-block p {
  font-size: 15.5px;
  color: var(--ink-2);
  line-height: 1.65;
  margin: 0;
}
.case-block p + p { margin-top: 14px; }
.case-block p .mark {
  color: var(--ink);
  font-weight: 500;
  background: rgba(47, 94, 62, 0.10);
  padding: 1px 6px;
  border-radius: 2px;
  border-bottom: 1px solid rgba(47, 94, 62, 0.35);
}

/* Stack block — same chrome, different body */
.case-stack-block .case-block-body {
  grid-template-columns: 1fr;
  padding-top: 22px;
}
.case-stack-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.case-stack-list .chip {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 6px 11px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  color: var(--ink-2);
}

/* Optional: outcome row — KPIs in a shiplog-style grid */
.case-outcome {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}
.case-outcome .stat {
  padding: 22px 22px 24px;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.case-outcome .stat:last-child { border-right: none; }
.case-outcome .num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.0;
  color: var(--ink);
}
.case-outcome .num .unit {
  font-size: 0.5em;
  color: var(--accent);
  margin-left: 4px;
  vertical-align: 0.18em;
}
.case-outcome .lab {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-3);
}
@media (max-width: 700px) {
  .case-outcome { grid-template-columns: 1fr; }
  .case-outcome .stat { border-right: none; border-bottom: 1px solid var(--line); }
  .case-outcome .stat:last-child { border-bottom: none; }
}

/* ---------- Case nav ---------- */
.case-nav {
  margin-top: clamp(64px, 9vw, 96px);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 640px) { .case-nav { grid-template-columns: 1fr; } }
.case-nav a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r);
  transition: border-color 0.2s, transform 0.2s, background 0.2s;
}
.case-nav a:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  background: var(--panel-2);
}
.case-nav a .label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-3);
}
.case-nav a:hover .label { color: var(--accent); }
.case-nav a .target {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.022em;
  color: var(--ink);
}
.case-nav .next { text-align: right; align-items: flex-end; }