/* ==========================================================================
   Case study pages (loaded after styles.css)
   ========================================================================== */
.cs-wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* Hero */
.cs-hero { padding: 56px 0 72px; }
.cs-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--dim);
  transition: color .2s;
}
.cs-back:hover { color: var(--text); }
.cs-back svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 1.6; transition: transform .2s; }
.cs-back:hover svg { transform: translateX(-3px); }

.cs-eyebrow {
  margin-top: 56px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  font: 400 12px var(--mono);
  color: var(--dim);
  letter-spacing: .08em;
  text-transform: uppercase;
}
.cs-eyebrow span:first-child { color: var(--accent); }

.cs-title {
  margin-top: 20px;
  max-width: 17ch;
  font-size: clamp(44px, 7.2vw, 88px);
  line-height: 1;
  letter-spacing: -.03em;
}

.cs-lede {
  margin-top: 28px;
  max-width: 56ch;
  font-size: 19px;
  line-height: 1.55;
  color: var(--muted);
}

.cs-facts {
  margin: 48px 0 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line-2);
}
.cs-facts div { padding: 18px 16px 0 0; }
.cs-facts div + div { padding-left: 16px; border-left: 1px solid var(--line); }
.cs-facts dt { font: 400 11px var(--mono); color: var(--dim); letter-spacing: .08em; text-transform: uppercase; }
.cs-facts dd { margin: 8px 0 0; font-size: 15px; }

/* Kicker headings */
.cs-kicker {
  font: 400 12px var(--mono);
  color: var(--dim);
  letter-spacing: .14em;
  text-transform: uppercase;
}

/* Impact */
.cs-impact { padding: 72px 0; border-top: 1px solid var(--line); }
.cs-stats {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--line-2);
  background: var(--bg-raised);
}
.cs-stat { padding: 32px 28px 30px; }
.cs-stat + .cs-stat { border-left: 1px solid var(--line-2); }
.cs-stat b {
  display: block;
  font: 400 clamp(52px, 6.4vw, 72px)/1 var(--serif);
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
}
.cs-stat strong { display: block; margin-top: 14px; font-weight: 500; font-size: 15px; }
.cs-stat span { display: block; margin-top: 6px; font-size: 13.5px; line-height: 1.45; color: var(--dim); }
.cs-stat:first-child b { color: var(--accent); }

/* Body sections: label column + content column */
.cs-section {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  padding: 72px 0;
  border-top: 1px solid var(--line);
}
.cs-section > h2 {
  position: sticky;
  top: 96px;
  align-self: start;
  font-size: 34px;
  line-height: 1.05;
  letter-spacing: -.02em;
}
.cs-prose { max-width: 62ch; }
.cs-prose p { font-size: 17px; line-height: 1.65; color: var(--muted); }
.cs-prose p + p { margin-top: 18px; }
.cs-prose strong { color: var(--text); font-weight: 500; }

.cs-pillars { list-style: none; margin-top: 36px; display: grid; border-top: 1px solid var(--line-2); }
.cs-pillars li {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 4px 16px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line-2);
}
.cs-pillars .num { grid-row: span 2; font: 400 13px var(--mono); color: var(--accent); padding-top: 6px; }
.cs-pillars h3 { font-size: 26px; line-height: 1.15; letter-spacing: -.01em; }
.cs-pillars p { margin-top: 6px; color: var(--muted); font-size: 16px; line-height: 1.6; }

/* Posts */
.cs-posts { padding: 72px 0; border-top: 1px solid var(--line); }
.cs-posts-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; flex-wrap: wrap; }
.cs-posts-head h2 { font-size: clamp(30px, 4vw, 40px); line-height: 1.05; letter-spacing: -.02em; }
.cs-posts-head p { color: var(--dim); font-size: 14px; }
.cs-post-grid {
  margin-top: 36px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.cs-post { margin: 0; }
.cs-post .post {
  aspect-ratio: 9 / 16;
  border-radius: 3px;
  border-color: rgba(108, 243, 176, .4);
  box-shadow: 0 18px 50px -24px rgba(108, 243, 176, .35);
}
.cs-post .post-views { left: 12px; bottom: 12px; font-size: 13px; }
.cs-post .post-views svg { width: 12px; height: 12px; }
.cs-post figcaption { padding: 16px 2px 0; }
.cs-post figcaption b { display: block; font: 400 30px/1 var(--serif); letter-spacing: -.02em; }
.cs-post figcaption p { margin-top: 8px; font-size: 15px; line-height: 1.5; color: var(--muted); }
.cs-post figcaption span { display: block; margin-top: 8px; font: 400 12px var(--mono); color: var(--dim); }

/* Results */
.cs-results-lines { list-style: none; display: grid; border-top: 1px solid var(--line-2); }
.cs-results-lines li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-2);
  color: var(--muted);
}
.cs-results-lines b { font: 400 30px/1.1 var(--serif); color: var(--text); letter-spacing: -.02em; }

.cs-chart { margin: 40px 0 0; }
.cs-chart-head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.cs-chart-head h3 { font: 500 15px var(--sans); color: var(--text); }
.cs-chart-head p { font-size: 13px; color: var(--dim); }
.cs-chart-plot { position: relative; margin-top: 18px; height: 260px; }
.cs-chart-plot svg { width: 100%; height: 100%; overflow: visible; }
.cs-chart .grid line { stroke: #1d1d1d; stroke-width: 1; shape-rendering: crispEdges; }
.cs-chart .axis text { fill: var(--dim); font: 400 11px var(--mono); }
.cs-chart .bar { fill: #3ccf8e; transform-box: fill-box; transform-origin: bottom; transition: opacity .2s; }
.cs-chart .bar.is-dim { opacity: .35; }
.cs-chart .peak-label { fill: var(--text); font: 500 12px var(--mono); }
.cs-chart .hit { fill: transparent; cursor: default; }
.js .cs-chart .bar { transform: scaleY(0); transition: transform .9s var(--ease), opacity .2s; transition-delay: calc(var(--i) * 18ms), 0s; }
.js .cs-chart.is-in .bar { transform: scaleY(1); }
.cs-tip {
  position: absolute;
  z-index: 5;
  padding: 8px 10px;
  border: 1px solid var(--line-3);
  background: #111;
  font-size: 12px;
  line-height: 1.35;
  white-space: nowrap;
  pointer-events: none;
  transform: translate(-50%, calc(-100% - 10px));
  opacity: 0;
  transition: opacity .12s;
}
.cs-tip.show { opacity: 1; }
.cs-tip span { display: block; font: 400 11px var(--mono); color: var(--dim); }
.cs-tip b { font-weight: 500; }

.cs-table { margin-top: 16px; font-size: 13px; color: var(--dim); }
.cs-table summary { cursor: pointer; width: max-content; }
.cs-table summary:hover { color: var(--text); }
.cs-table-scroll { max-height: 260px; overflow: auto; margin-top: 12px; border: 1px solid var(--line-2); }
.cs-table table { width: 100%; border-collapse: collapse; font: 400 12px var(--mono); }
.cs-table th, .cs-table td { padding: 8px 12px; text-align: left; border-bottom: 1px solid var(--line); }
.cs-table th { position: sticky; top: 0; background: #0d0d0d; color: var(--muted); font-weight: 500; }
.cs-table td:last-child, .cs-table th:last-child { text-align: right; }

.cs-subheading { margin-top: 48px; font: 500 15px var(--sans); color: var(--text); }
.cs-lessons { list-style: none; margin-top: 16px; display: grid; gap: 12px; }
.cs-lessons li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 12px;
  padding: 18px 20px;
  border: 1px solid var(--line-2);
  background: var(--bg-raised);
  color: var(--muted);
  line-height: 1.55;
}
.cs-lessons .num { font: 400 13px var(--mono); color: var(--accent); padding-top: 2px; }
.cs-lessons strong { color: var(--text); font-weight: 500; }

/* Read next */
.cs-next { padding: 72px 0; border-top: 1px solid var(--line); }
.cs-next-grid { margin-top: 28px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.cs-next-card {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 20px;
  padding: 16px;
  border: 1px solid var(--line-2);
  background: var(--bg-raised);
  transition: border-color .25s, background-color .25s;
}
.cs-next-card:hover { border-color: var(--line-3); background: #0e0e0e; }
.cs-next-card .post { aspect-ratio: 4 / 5; border-radius: 8px; }
.cs-next-card .case-meta { font-size: 11px; }
.cs-next-card h3 { margin-top: 10px; font-size: 24px; line-height: 1.1; letter-spacing: -.01em; }
.cs-next-card .link-arrow { margin-top: 16px; }
.cs-next-card > div { display: flex; flex-direction: column; justify-content: center; align-items: flex-start; }

/* Index page */
.csi-hero { padding: 72px 0 56px; }
.csi-hero h1 { font-size: clamp(52px, 8vw, 96px); line-height: 1; letter-spacing: -.03em; }
.csi-hero p { margin-top: 20px; max-width: 52ch; font-size: 18px; color: var(--muted); }
.csi-totals { margin-top: 48px; }
.csi-list { padding: 24px 0 96px; display: grid; gap: 16px; }
.csi-card {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 40px;
  padding: 24px;
  border: 1px solid var(--line-2);
  background: var(--bg-raised);
  transition: border-color .25s;
}
.csi-card:hover { border-color: var(--line-3); }
.csi-card .post-row { margin: 0; gap: 2px; }
.csi-card .post { aspect-ratio: 9 / 14; }
.csi-card .case-title { font-size: clamp(28px, 3.4vw, 36px); max-width: 18ch; }
.csi-card .stat-big { margin-top: 24px; }
.csi-card .stat-big b { font-size: clamp(48px, 6vw, 64px); }
.csi-copy { display: flex; flex-direction: column; justify-content: center; align-items: flex-start; }

@media (max-width: 860px) {
  .cs-facts { grid-template-columns: 1fr 1fr; }
  .cs-facts div:nth-child(3) { padding-left: 0; border-left: 0; }
  .cs-facts div:nth-child(n + 3) { margin-top: 12px; }
  .cs-stats { grid-template-columns: 1fr; }
  .cs-stat + .cs-stat { border-left: 0; border-top: 1px solid var(--line-2); }
  .cs-section { grid-template-columns: 1fr; gap: 24px; padding: 56px 0; }
  .cs-section > h2 { position: static; font-size: 30px; }
  .cs-post-grid { grid-template-columns: 1fr 1fr; }
  .cs-next-grid { grid-template-columns: 1fr; }
  .csi-card { grid-template-columns: 1fr; gap: 28px; }
}
@media (max-width: 640px) {
  .cs-back { padding: 10px 0; margin: -10px 0; }
  .cs-table summary { padding: 10px 0; }
}
@media (max-width: 520px) {
  .cs-lede { font-size: 17px; }
  .cs-post-grid { grid-template-columns: 1fr; max-width: 320px; }
  .cs-pillars li { grid-template-columns: 40px 1fr; }
  .cs-lessons li { grid-template-columns: 32px 1fr; padding: 16px; }
  .cs-next-card { grid-template-columns: 96px 1fr; gap: 16px; }
  .cs-chart-plot { height: 220px; }
  .csi-card { padding: 16px; }
}