/* =========================================================================
   Case-study pages. Loaded AFTER styles.css, so every token, button, nav and
   footer style is inherited — this file only adds the long-form article layout
   the landing page has no need for.
   ========================================================================= */

/* --- Article head ------------------------------------------------------- */
.cs-hero { padding-block: clamp(48px, 8vh, 96px) clamp(28px, 4vw, 44px); }
.cs-back {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 14px;
  color: var(--text-soft);
  transition: color 0.3s var(--ease);
}
.cs-back:hover { color: var(--text); }
.cs-back .arrow { transition: transform 0.35s var(--ease); }
.cs-back:hover .arrow { transform: translateX(-3px); }

.cs-title {
  margin-top: clamp(20px, 3vw, 32px);
  font-size: clamp(32px, 5.2vw, 60px);
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: -0.02em;
  max-width: 20ch;
}
.cs-standfirst {
  margin-top: clamp(18px, 2.4vw, 26px);
  font-size: clamp(17px, 1.8vw, 21px);
  line-height: 1.55;
  color: var(--text-dim);
  max-width: 58ch;
}

/* Client fact strip under the title. */
.cs-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  margin-top: clamp(24px, 3vw, 32px);
}

/* --- Body layout: sticky contents rail + article ------------------------ */
.cs-body {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: clamp(32px, 5vw, 72px);
  padding-block: clamp(32px, 5vw, 64px) clamp(56px, 8vw, 104px);
  border-top: 1px solid var(--border);
}
.cs-toc { position: sticky; top: 100px; align-self: start; }
.cs-toc__label {
  font-size: 11.5px; font-weight: 700; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--text-soft);
  margin-bottom: 14px;
}
.cs-toc a {
  display: block;
  padding: 7px 0;
  font-size: 14.5px;
  color: var(--text-soft);
  border-left: 1px solid var(--border);
  padding-left: 14px;
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease);
}
.cs-toc a:hover { color: var(--text); border-left-color: var(--accent); }

.cs-article > section + section { margin-top: clamp(40px, 5vw, 64px); }
.cs-h2 {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 600;
  letter-spacing: -0.015em;
  margin-bottom: clamp(16px, 2vw, 22px);
}
.cs-article p {
  color: var(--text-dim);
  font-size: clamp(16px, 1.6vw, 17.5px);
  line-height: 1.68;
  max-width: 68ch;
}
.cs-article p + p { margin-top: 16px; }
.cs-article strong { color: var(--text); font-weight: 700; }

/* Bulleted lists — the roman-numeral device is the landing page's; long-form
   body copy reads better with a plain accent marker. */
.cs-list { margin-top: 18px; display: grid; gap: 12px; max-width: 68ch; }
.cs-list li {
  position: relative;
  padding-left: 26px;
  color: var(--text-dim);
  font-size: clamp(15.5px, 1.55vw, 17px);
  line-height: 1.62;
}
.cs-list li::before {
  content: "";
  position: absolute;
  left: 4px; top: 0.72em;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.cs-list li strong { color: var(--text); }

/* Numbered phases. */
.cs-steps { margin-top: 22px; display: grid; gap: 2px; max-width: 68ch; counter-reset: phase; }
.cs-steps li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--border);
}
.cs-steps li::before {
  counter-increment: phase;
  content: counter(phase, upper-roman) ".";
  font-family: var(--sans);
  font-weight: 500;
  color: var(--accent);
  font-size: 15px;
}
.cs-steps h3 { font-size: 17.5px; font-weight: 600; margin-bottom: 5px; }
.cs-steps p { font-size: 15.5px; }

/* --- Before / after table ---------------------------------------------- */
.cs-table {
  margin-top: 22px;
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  overflow: hidden;
}
.cs-row {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
  padding: 15px clamp(16px, 2vw, 22px);
  font-size: 15px;
  line-height: 1.5;
}
.cs-row + .cs-row { border-top: 1px solid var(--border); }
.cs-row--head {
  background: rgba(255,255,255,0.03);
  font-size: 11.5px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text-soft);
}
.cs-row--head span:last-child { color: var(--accent); }
.cs-row > span:first-child { color: var(--text); font-weight: 600; }
.cs-row > span { color: var(--text-dim); min-width: 0; }
.cs-row > span:last-child { color: var(--text); }

/* --- Pull quote --------------------------------------------------------- */
.cs-quote {
  margin: clamp(36px, 5vw, 56px) 0 0;
  padding: clamp(26px, 3vw, 38px);
  border: 1px solid var(--border);
  border-radius: var(--r-card-lg);
  background:
    radial-gradient(120% 120% at 100% 0%, rgba(129,137,242,0.08), transparent 55%),
    var(--sheen),
    var(--surface);
  box-shadow: var(--edge-light), var(--shadow-1);
}
.cs-quote blockquote { margin: 0; }
.cs-quote blockquote p {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(19px, 2.3vw, 26px);
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--text);
  max-width: none;
}
.cs-quote figcaption {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

/* --- Stack chips -------------------------------------------------------- */
.cs-stack { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 20px; }
.cs-stack .tag { color: var(--text-dim); font-weight: 500; letter-spacing: 0.02em; }

/* --- Closing CTA -------------------------------------------------------- */
.cs-end {
  margin-top: clamp(44px, 6vw, 72px);
  padding: clamp(28px, 4vw, 48px);
  border: 1px solid var(--border);
  border-radius: var(--r-block);
  background: var(--sheen), rgba(255,255,255,0.02);
  box-shadow: var(--edge-light);
  text-align: center;
}
.cs-end h2 {
  font-size: clamp(24px, 3.2vw, 38px);
  font-weight: 600;
  letter-spacing: -0.015em;
  max-width: 22ch;
  margin-inline: auto;
}
.cs-end p { margin: 16px auto 26px; max-width: 52ch; color: var(--text-dim); }
.cs-end .btn { margin-inline: auto; }

/* --- Responsive --------------------------------------------------------- */
@media (max-width: 900px) {
  /* The rail becomes a horizontal scroller above the article. */
  .cs-body { grid-template-columns: 1fr; gap: 28px; }
  .cs-toc { position: static; }
  .cs-toc__list { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 4px; }
  .cs-toc a { border-left: 0; border-bottom: 1px solid var(--border); padding: 6px 2px; white-space: nowrap; }
  .cs-toc a:hover { border-bottom-color: var(--accent); }
}
@media (max-width: 620px) {
  .cs-row { grid-template-columns: 1fr; gap: 4px; padding: 14px 16px; }
  .cs-row--head { display: none; }
  .cs-row > span:nth-child(2)::before { content: "Before — "; color: var(--text-soft); }
  .cs-row > span:nth-child(3)::before { content: "Now — "; color: var(--accent); }
  .cs-steps li { grid-template-columns: 34px minmax(0, 1fr); gap: 12px; }
}