/* ============================================================
   Case study detail page (Currently)
   ============================================================ */
.cs { background: var(--paper); min-height: 100vh; padding-bottom: var(--s7); }

/* top bar */
.cs-bar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.cs-bar-in { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.cs-back { display: inline-flex; align-items: center; gap: 7px; background: none; border: none; cursor: pointer; font-family: var(--body); font-size: 15px; font-weight: 600; color: var(--ink); padding: 8px 0; transition: gap 160ms var(--ease); }
.cs-back:hover { gap: 12px; color: var(--tang); }
.cs-bar-name { font-size: 12.5px; color: var(--ink-faint); }
.cs-bar-cta { background: none; border: none; cursor: pointer; font-family: var(--mono); font-size: 13px; color: var(--ink-soft); transition: color 150ms; }
.cs-bar-cta:hover { color: var(--tang); }
@media (max-width: 600px) { .cs-bar-name { display: none; } }

/* hero */
.cs-hero { padding-top: var(--s7); padding-bottom: var(--s5); }
.cs-kicker { font-size: 13px; color: var(--tang-ink); display: block; margin-bottom: var(--s3); }
.cs-title { font-family: var(--display); font-weight: 700; font-size: clamp(34px, 6vw, 78px); line-height: 0.98; letter-spacing: -0.035em; }
.cs-title b { color: var(--tang); }
.cs-dek { margin-top: var(--s4); max-width: 60ch; }
.cs-meta { display: flex; flex-wrap: wrap; gap: var(--s5); margin-top: var(--s5); padding-top: var(--s4); border-top: 2px solid var(--line); }
.cs-meta > div { display: flex; flex-direction: column; gap: 6px; font-size: 16px; font-weight: 600; }
.cs-meta-k { font-size: 11px; text-transform: uppercase; letter-spacing: 0.07em; color: var(--ink-faint); font-weight: 400; }

/* body */
.cs-body { max-width: 820px; }
.cs-sec { padding-block: var(--s5); border-top: 1px solid var(--line); }
.cs-sec:first-child { border-top: none; }
.cs-sec .kicker { margin-bottom: var(--s3); }
.cs-h { letter-spacing: -0.02em; margin-bottom: var(--s3); max-width: 20ch; }
.cs-p { font-size: 18px; line-height: 1.6; color: var(--ink-soft); max-width: 64ch; }
.cs-p b { color: var(--ink); font-weight: 600; }
.cs-p i { color: var(--ink); font-style: italic; }

.cs-quote { margin-top: var(--s4); padding: 24px 28px; background: var(--ink); color: var(--paper); border-radius: var(--r); }
.cs-quote p { font-family: var(--display); font-weight: 600; font-size: clamp(19px, 2.3vw, 25px); line-height: 1.3; letter-spacing: -0.01em; }
.cs-quote span { display: block; margin-top: 12px; font-size: 13px; color: color-mix(in srgb, var(--paper) 60%, transparent); }

.cs-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: var(--s4); }
.cs-card { background: var(--card); border: 2px solid var(--line); border-radius: var(--r); padding: 22px; }
.cs-card-k { font-family: var(--display); font-size: 19px; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 8px; }
.cs-card p { font-size: 15px; color: var(--ink-soft); line-height: 1.5; }
@media (max-width: 720px) { .cs-cards { grid-template-columns: 1fr; } }

.cs-flow { list-style: none; margin: var(--s4) 0 0; padding: 0; display: flex; flex-direction: column; gap: 16px; }
.cs-flow li { display: grid; grid-template-columns: 44px 1fr; gap: 16px; align-items: start; font-size: 17px; color: var(--ink-soft); line-height: 1.5; }
.cs-flow li b { color: var(--ink); }
.cs-flow-n { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 50%; background: var(--marker); color: var(--on-marker); font-weight: 700; font-size: 16px; }

.cs-foot { display: flex; gap: 14px; flex-wrap: wrap; margin-top: var(--s6); padding-top: var(--s5); border-top: 2px solid var(--ink); }