/* ============================================================
   CASE-STUDY.CSS — long-form project pages (works/<slug>/)
   Loaded after studio.css; uses its tokens (--bg, --fg, --accent,
   --border, --font-*, --space-*). Rendered by js/case-study.js.
   Layout: hero → full-bleed hero figure → "In short" strip →
   numbered blocks (label | content) → looking back → next case.
   ============================================================ */

.case-main {
  --cs-soft: color-mix(in srgb, var(--fg) 68%, transparent);
  --cs-faint: color-mix(in srgb, var(--fg) 62%, transparent);
  --cs-pad: clamp(1.25rem, 4vw, 3rem);
  max-width: 1360px;
  margin: 0 auto;
  padding: 0 var(--cs-pad) var(--space-9, 96px);
}

/* ── Hero ─────────────────────────────────────────────────── */
.cs-hero { padding: clamp(7rem, 16vh, 10rem) 0 var(--space-7, 48px); }
.cs-back {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-label);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cs-soft);
  text-decoration: none;
  margin-bottom: var(--space-6, 32px);
  transition: color 200ms var(--ease-quart);
}
.cs-back:hover, .cs-back:focus-visible { color: var(--accent-text); }
.cs-kicker {
  font-family: var(--font-mono);
  font-size: var(--text-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-text);
  margin: 0 0 var(--space-4, 16px);
}
.cs-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.8rem, 9vw, 8rem);
  line-height: 0.95;
  letter-spacing: -0.035em;
  margin: 0;
  text-wrap: balance;
}
.cs-thesis {
  font-size: clamp(1.25rem, 2.6vw, 2rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  max-width: 28ch;
  margin: var(--space-6, 32px) 0 var(--space-7, 48px);
  color: var(--fg);
  text-wrap: balance;
}
.cs-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 0;
  margin: 0;
  border-top: 1px solid var(--border);
}
.cs-meta > div { padding: var(--space-4, 16px) var(--space-4, 16px) var(--space-4, 16px) 0; border-bottom: 1px solid var(--border); }
.cs-meta dt {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cs-faint);
  margin: 0 0 6px;
}
.cs-meta dd { margin: 0; font-size: 0.95rem; line-height: 1.4; }

/* ── Hero figure (full width of the column) ───────────────── */
.cs-hero-fig {
  margin: 0 0 var(--space-8, 64px);
  background: var(--fig-bg, var(--surface));
  display: flex;
  justify-content: center;
  overflow: hidden;
  border: 1px solid var(--border);
}
.cs-hero-img { display: block; width: 100%; height: auto; }
.cs-hero-img--contain { width: auto; max-width: 100%; max-height: min(82vh, 920px); }
.cs-hero-img--cover { max-height: min(78vh, 800px); object-fit: cover; }

/* ── "In short" strip ─────────────────────────────────────── */
.cs-short { padding: var(--space-6, 32px) 0 var(--space-8, 64px); }
.cs-short-title {
  font-family: var(--font-mono);
  font-size: var(--text-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-text);
  font-weight: 500;
  margin: 0 0 var(--space-5, 24px);
}
.cs-short-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border: 1px solid var(--border);
}
.cs-short-list li { padding: var(--space-5, 24px) var(--space-4, 16px); border-right: 1px solid var(--border); display: flex; flex-direction: column; gap: var(--space-3, 12px); }
.cs-short-list li:last-child { border-right: 0; }
.cs-short-k { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent-text); }
.cs-short-k i { font-style: normal; color: var(--cs-faint); margin-right: 0.6em; }
.cs-short-v { font-size: 0.92rem; line-height: 1.5; color: var(--fg); }

/* ── Numbered blocks ──────────────────────────────────────── */
.cs-block, .cs-looking {
  display: grid;
  grid-template-columns: minmax(150px, 1fr) minmax(0, 3.2fr);
  gap: var(--space-5, 24px) var(--space-8, 64px);
  padding: var(--space-8, 64px) 0;
  border-top: 1px solid var(--border);
}
.cs-block-head { display: flex; align-items: baseline; gap: var(--space-3, 12px); align-self: start; position: sticky; top: 6rem; }
.cs-num { font-family: var(--font-mono); font-size: 0.75rem; color: var(--cs-faint); }
.cs-label {
  font-family: var(--font-mono);
  font-size: var(--text-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-text);
  font-weight: 500;
}
.cs-block-body { min-width: 0; }
.cs-h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.4vw, 2.7rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin: 0 0 var(--space-5, 24px);
  max-width: 22ch;
  text-wrap: balance;
}
.cs-p { font-size: clamp(1.02rem, 1.4vw, 1.2rem); line-height: 1.65; max-width: 62ch; margin: 0 0 1.1em; color: var(--fg); }
.cs-note {
  font-size: 0.95rem;
  color: var(--cs-soft);
  border-left: 2px solid var(--accent);
  padding-left: var(--space-4, 16px);
}
.cs-list { margin: 0 0 1.4em; padding: 0; list-style: none; max-width: 62ch; }
.cs-list li { padding: 10px 0 10px 1.5em; border-bottom: 1px solid var(--border); position: relative; font-size: 1.02rem; line-height: 1.5; }
.cs-list li::before { content: ''; position: absolute; left: 0; top: 1.15em; width: 7px; height: 7px; background: var(--accent); border-radius: 50%; }

/* ── Figures ──────────────────────────────────────────────── */
.cs-figs { display: grid; gap: var(--space-4, 16px); margin-top: var(--space-6, 32px); }
.cs-figs--pair { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.cs-figs--stack { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.cs-fig { margin: 0; }
.cs-fig-frame {
  background: var(--fig-bg, var(--surface));
  border: 1px solid var(--border);
  display: flex;
  justify-content: center;
  overflow: hidden;
}
.cs-fig img { display: block; width: 100%; height: auto; max-height: 86vh; object-fit: contain; }
.cs-figs--wide .cs-fig img { width: auto; max-width: 100%; max-height: min(80vh, 820px); }
.cs-fig figcaption { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.06em; color: var(--cs-soft); padding: 10px 2px 0; line-height: 1.5; }

/* ── Looking back ─────────────────────────────────────────── */
.cs-back-rows { border-top: 1px solid var(--border); margin: var(--space-5, 24px) 0 var(--space-6, 32px); }
.cs-back-row {
  display: grid;
  grid-template-columns: minmax(150px, 1fr) minmax(0, 2.2fr) auto;
  gap: var(--space-4, 16px);
  align-items: baseline;
  padding: var(--space-4, 16px) 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: var(--fg);
  transition: color 200ms var(--ease-quart), padding-left 300ms var(--ease-expo);
}
.cs-back-row:hover, .cs-back-row:focus-visible { color: var(--accent-text); padding-left: 8px; }
.cs-back-name { font-weight: 700; letter-spacing: -0.01em; }
.cs-back-line { font-size: 0.95rem; color: var(--cs-soft); }
.cs-back-tag { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--cs-faint); }
.cs-back-row.is-here { color: var(--accent-text); }
.cs-back-row.is-here .cs-back-tag { color: var(--accent-text); }
.cs-looking-p { color: var(--cs-soft); }

/* ── Next case ────────────────────────────────────────────── */
.cs-next {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-3, 12px) var(--space-5, 24px);
  padding: var(--space-8, 64px) 0 0;
  border-top: 1px solid var(--border);
  text-decoration: none;
  color: var(--fg);
}
.cs-next-k { grid-column: 1 / -1; font-family: var(--font-mono); font-size: var(--text-label); letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent-text); }
.cs-next-title { font-weight: 800; font-size: clamp(2rem, 6vw, 5rem); line-height: 1; letter-spacing: -0.03em; transition: color 200ms var(--ease-quart); }
.cs-next-line { grid-column: 1; max-width: 40ch; color: var(--cs-soft); line-height: 1.4; }
.cs-next-arrow { grid-row: 2 / span 2; grid-column: 2; align-self: center; font-size: clamp(2rem, 5vw, 4rem); transition: transform 300ms var(--ease-expo), color 200ms; }
.cs-next:hover .cs-next-title, .cs-next:focus-visible .cs-next-title { color: var(--accent-text); }
.cs-next:hover .cs-next-arrow, .cs-next:focus-visible .cs-next-arrow { transform: translateX(10px); color: var(--accent-text); }

/* ── Scroll reveal (JS adds .is-in) ───────────────────────── */
.cs-reveal { opacity: 0; transform: translateY(18px); transition: opacity 600ms var(--ease-quart), transform 700ms var(--ease-expo); }
.cs-reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .cs-reveal { opacity: 1; transform: none; transition: none; }
  .cs-back-row, .cs-next-arrow { transition: none; }
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 960px) {
  .cs-short-list { grid-template-columns: 1fr; }
  .cs-short-list li { border-right: 0; border-bottom: 1px solid var(--border); flex-direction: row; gap: var(--space-4, 16px); }
  .cs-short-list li:last-child { border-bottom: 0; }
  .cs-short-k { flex: 0 0 8.5rem; }
}
@media (max-width: 800px) {
  .cs-block, .cs-looking { grid-template-columns: 1fr; gap: var(--space-4, 16px); padding: var(--space-7, 48px) 0; }
  .cs-block-head { position: static; }
  .cs-figs--pair { grid-template-columns: 1fr; }
  .cs-back-row { grid-template-columns: 1fr auto; }
  .cs-back-line { grid-column: 1 / -1; grid-row: 2; }
  .cs-next { grid-template-columns: 1fr; }
  .cs-next-arrow { display: none; }
}

@media (max-width: 600px) {
  .cs-short-list li { flex-direction: column; gap: var(--space-2, 8px); }
  .cs-short-k { flex: none; }
}