/* ============================================================
   case-studies.css — case-study listing and static case details
   Owns: cs-* classes, plus .card* markup injected by main.js
   (scoped to .page-case-studies so blog-page card styles never
   collide). Colors come only from base.css tokens.
   ============================================================ */

/* ---------- hero ---------- */

.cs-hero {
  padding: clamp(72px, 9vw, 128px) 0 clamp(56px, 7vw, 96px);
}

.cs-hero__title {
  font-size: clamp(40px, 6vw, 84px);
  max-width: 18ch;
  margin-top: 20px;
}

/* yellow highlight mark (SPEC: dark ink on --accent fill, never
   yellow text on --bg). inline-block so the fill stays inside its
   own line box — inline fragments painted over the line above. */
.cs-hero__title em {
  display: inline-block;
  font-style: normal;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 0 0.12em;
}

.cs-hero__lede {
  margin: clamp(22px, 3vw, 32px) 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-dim);
}

/* ---------- listing section ---------- */

.cs-listing {
  padding: clamp(56px, 7vw, 96px) 0;
}

.cs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(28px, 3.5vw, 44px) clamp(24px, 2.5vw, 36px);
}

/* ---------- .card markup (rendered by main.js into [data-case-studies]) ----------
   Case cards are "the ledger": dark thumb scenes that stay near-black
   in both themes, a yellow Oswald stat, and a flat 1px --line frame.
   The scene lives on .card-thumb::after so hover zooms artwork only. */

.page-case-studies .card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  background: var(--bg);
  transition: transform 0.3s var(--ease-out-quart), border-color 0.25s ease;
}
.page-case-studies .card:hover,
.page-case-studies .card:focus-within {
  transform: translateY(-4px);
  border-color: var(--ink);
}

.page-case-studies .card-link {
  display: flex;
  flex-direction: column;
  height: 100%;
}

/* thumbnail: pure-CSS dark scene, aspect 16/10, big stat inside */
.page-case-studies .card-thumb {
  position: relative;
  display: block;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  margin-bottom: 18px;
  background: var(--band-dark-bg);
}

/* the paintable scene (zooms subtly on hover) */
.page-case-studies .card-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  transition: transform 0.6s var(--ease-out-quint);
}
.page-case-studies .card:hover .card-thumb::after,
.page-case-studies .card:focus-within .card-thumb::after {
  transform: scale(1.045);
}

/* scanline texture over every thumb */
.page-case-studies .card-thumb::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0 3px,
    color-mix(in srgb, var(--band-dark-ink) 10%, transparent) 3px 4px
  );
  opacity: 0.6;
  pointer-events: none;
}

/* distinct dark scenes per card position (industry-agnostic) */
.page-case-studies .card:nth-child(6n+1) .card-thumb::after {
  background:
    radial-gradient(90% 120% at 18% 8%, color-mix(in srgb, var(--accent) 70%, transparent) 0%, transparent 55%),
    radial-gradient(60% 80% at 88% 90%, color-mix(in srgb, var(--blue) 50%, transparent), transparent 62%);
}
.page-case-studies .card:nth-child(6n+2) .card-thumb::after {
  background:
    linear-gradient(115deg, color-mix(in srgb, var(--blue) 85%, transparent) 0%, transparent 62%),
    radial-gradient(70% 90% at 85% 92%, color-mix(in srgb, var(--accent) 34%, transparent), transparent 60%);
}
.page-case-studies .card:nth-child(6n+3) .card-thumb::after {
  background:
    radial-gradient(60% 85% at 88% 16%, color-mix(in srgb, var(--accent) 55%, transparent), transparent 55%),
    linear-gradient(100deg, color-mix(in srgb, var(--blue) 80%, transparent) 0%, transparent 60%);
}
.page-case-studies .card:nth-child(6n+4) .card-thumb::after {
  background:
    conic-gradient(from 210deg at 62% 42%, transparent 0deg,
      color-mix(in srgb, var(--blue) 75%, transparent) 110deg, transparent 225deg,
      color-mix(in srgb, var(--accent) 30%, transparent) 330deg, transparent 360deg);
}
.page-case-studies .card:nth-child(6n+5) .card-thumb::after {
  background:
    radial-gradient(75% 100% at 10% 92%, color-mix(in srgb, var(--accent) 45%, transparent), transparent 58%),
    repeating-linear-gradient(90deg, var(--band-dark-line) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(0deg, var(--band-dark-line) 0 1px, transparent 1px 56px);
}
.page-case-studies .card:nth-child(6n+6) .card-thumb::after {
  background:
    radial-gradient(closest-side at 50% 56%, color-mix(in srgb, var(--blue) 65%, transparent), transparent 72%),
    radial-gradient(42% 55% at 80% 20%, color-mix(in srgb, var(--accent) 45%, transparent), transparent 60%);
}

/* the headline number, bottom-left of the thumb — yellow on dark (both themes) */
.page-case-studies .card-stat {
  position: absolute;
  left: 16px;
  bottom: 10px;
  z-index: 2;
  font-family: var(--font-head);
  font-weight: 400;
  font-size: clamp(40px, 4.2vw, 60px);
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  color: var(--accent);
  text-shadow: 0 2px 18px color-mix(in srgb, var(--band-dark-bg) 70%, transparent);
}

/* mono industry chip, top-left of the thumb */
.page-case-studies .card-cat {
  position: absolute;
  top: 12px;
  left: 16px;
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--accent);
  background: var(--band-dark-bg);
  border: 1px solid var(--band-dark-line);
  padding: 4px 10px;
}

/* meta row (date / stat label under the thumb) */
.page-case-studies .card-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 0 20px;
  margin-bottom: 10px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-case-studies .card-meta time { color: var(--muted); }

.page-case-studies .card-tags {
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--tag-ink);
  text-align: right;
}

.page-case-studies .card-title {
  padding: 0 20px;
  font-size: clamp(21px, 1.9vw, 25px);
  font-weight: 500;
  line-height: 1.18;
  margin-bottom: 10px;
  transition: color 0.2s ease;
}

.page-case-studies .card-excerpt {
  margin: 0 0 22px; /* bottom space as margin: vertical padding on a
                       line-clamped box lets the next line bleed through */
  padding: 0 20px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-dim);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* hover: card lifts (above), artwork zooms, title turns link-blue */
.page-case-studies .card:hover .card-title,
.page-case-studies .card:focus-within .card-title {
  color: var(--link-ink);
}

/* empty / not_configured state injected by main.js */
.page-case-studies .empty-state,
.page-study .empty-state {
  grid-column: 1 / -1;
  padding: clamp(40px, 6vw, 72px) clamp(24px, 3vw, 48px);
  border: 1px dashed var(--line);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.page-case-studies .empty-state::before,
.page-study .empty-state::before {
  content: "//.status";
  display: block;
  color: var(--tag-ink);
  font-size: 12px;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

/* ---------- results strip (static, theme-consistent dark band) ---------- */

.cs-results {
  padding: clamp(72px, 9vw, 128px) 0;
}

.cs-results .pluses { color: var(--band-dark-dim); }

.cs-results__intro {
  max-width: 760px;
  margin-bottom: clamp(44px, 6vw, 80px);
}

.cs-results__heading {
  font-size: clamp(32px, 4.2vw, 54px);
  margin-top: 20px;
}

/* 3-column grid with 1px band-line dividers */
.cs-results__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--band-dark-line);
  border-bottom: 1px solid var(--band-dark-line);
}

.cs-results__cell {
  padding: clamp(36px, 4vw, 60px) clamp(24px, 3vw, 48px);
}

.cs-results__cell + .cs-results__cell {
  border-left: 1px solid var(--band-dark-line);
}

.cs-results__pluses {
  margin: 14px 0 0;
  font-size: 13px;
}

.cs-results__stat {
  font-size: clamp(48px, 5.5vw, 96px);
  font-weight: 400;
  line-height: 1;
  margin: clamp(24px, 3vw, 40px) 0 18px;
  color: var(--accent);
}

.cs-results__unit {
  font-size: 0.38em;
  letter-spacing: 0.04em;
}

.cs-results__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--band-dark-dim);
  max-width: 34ch;
}

/* ============================================================
   static case-study detail
   ============================================================ */

.page-study {
  padding: clamp(56px, 7vw, 96px) 0 clamp(72px, 9vw, 128px);
}

/* back link */
.cs-back {
  margin-bottom: clamp(32px, 4vw, 48px);
}

.cs-back__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  /* matches the static article back link: muted resting, link ink on hover */
  color: var(--muted);
  transition: color 0.2s ease;
}

.cs-back__arrow {
  display: inline-block;
  color: var(--tag-ink); /* same arrow treatment as .bp-back::before */
  transition: transform 0.2s var(--ease-out-quart);
}

.cs-back__link:hover {
  color: var(--link-ink);
}

.cs-back__link:hover .cs-back__arrow {
  transform: translateX(-4px);
}

/* content column (~800px) */
.cs-study {
  max-width: 800px;
}

/* injected header (main.js contract:
   .study-header > .study-meta(.tag + time) + .study-title + .study-summary) */
.page-study .study-meta {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 14px;
  margin: 0 0 18px;
}
.page-study .study-meta time {
  color: var(--muted);
  font-size: 12.5px;
  letter-spacing: 0.06em;
}
.page-study .study-title {
  font-size: clamp(34px, 4.6vw, 60px);
  margin: 0 0 20px;
}
.page-study .study-summary {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-dim);
}

/* stat block: giant Oswald figure + mono label, flat 1px --line frame */
.page-study .study-stat {
  margin: clamp(32px, 4.5vw, 48px) 0;
  padding: clamp(28px, 4vw, 44px) clamp(24px, 3vw, 40px);
  border: 1px solid var(--line);
  background: var(--bg-alt);
}
.page-study .study-stat-value {
  display: block;
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(56px, 8vw, 110px);
  line-height: 1;
  text-transform: uppercase;
  color: var(--ink);
}
.page-study .study-stat-label {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--tag-ink);
}

/* long-form body (HTML injected from the DB) — same type system as posts */
.page-study .post-body {
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.75;
  margin-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--line);
  padding-top: clamp(26px, 3.5vw, 40px);
}

/* lede — the opening paragraph earns a bigger stage */
.page-study .post-body > p:first-of-type {
  font-size: 1.13em;
  line-height: 1.7;
  color: var(--ink);
}

.page-study .post-body p {
  margin: 0 0 1.4em;
  color: var(--ink-dim);
}

.page-study .post-body h2 {
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 400;
  color: var(--ink);
  margin: 2em 0 0.7em;
}

.page-study .post-body h3 {
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 500;
  color: var(--ink);
  margin: 2.4em 0 0.6em; /* extra air above sub-heads */
}

.page-study .post-body ul,
.page-study .post-body ol {
  color: var(--ink-dim);
  margin: 0 0 1.5em;
}

.page-study .post-body li { margin-bottom: 0.55em; }

.page-study .post-body ul li {
  position: relative;
  padding-left: 1.4em;
}
.page-study .post-body ul li::before {
  content: "+";
  position: absolute;
  left: 0.2em;
  color: var(--tag-ink);
  font-weight: 700;
}
.page-study .post-body ol {
  list-style: decimal;
  padding-left: 1.4em;
}
.page-study .post-body ol li { padding-left: 0.4em; }
.page-study .post-body ol li::marker {
  color: var(--tag-ink);
  font-weight: 700;
}

.page-study .post-body a {
  color: var(--link-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: color-mix(in srgb, var(--link-ink) 45%, transparent);
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}
.page-study .post-body a:hover {
  text-decoration-color: currentColor;
}

.page-study .post-body strong { color: var(--ink); }

/* pull quote — framed by rules, no left color bar */
.page-study .post-body blockquote {
  margin: 2em 0;
  padding: clamp(18px, 2.5vw, 26px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-family: var(--font-head);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 400;
  line-height: 1.35;
  text-transform: uppercase;
  color: var(--ink);
}
.page-study .post-body blockquote::before {
  content: "//.";
  display: block;
  font-family: var(--font-mono);
  color: var(--tag-ink);
  font-size: 12px;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}
.page-study .post-body blockquote p {
  margin: 0;
  color: var(--ink);
}

.page-study .post-body hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2.5em 0;
}

.page-study .post-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--tag-ink);
  background: var(--bg-alt);
  border: 1px solid var(--line);
  padding: 2px 6px;
}

/* ---------- responsive ---------- */

@media (max-width: 1024px) {
  .cs-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .cs-grid { grid-template-columns: 1fr; }

  .cs-results__grid { grid-template-columns: 1fr; }

  .cs-results__cell + .cs-results__cell {
    border-left: 0;
    border-top: 1px solid var(--band-dark-line);
  }

  .cs-results__desc { max-width: none; }

  .page-case-studies .card-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }
  .page-case-studies .card-tags { text-align: left; }
}