/* ===================================================
   NAVA case study — extends style.css, same dark tokens
=================================================== */

/* ---------------- Hero ---------------- */
.cs-hero {
  position: relative;
  padding: calc(var(--header-h) + 40px) var(--pad) 0;
  overflow-x: clip;
}
.cs-hero-inner { max-width: var(--container); margin-inline: auto; }

.back-link {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: .95rem; color: var(--text-2);
  transition: color .2s var(--ease);
}
.back-link .ar { color: var(--copper); transition: transform .25s var(--ease); }
.back-link:hover { color: var(--text); }
.back-link:hover .ar { transform: translateX(4px); }

.cs-title-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
  gap: clamp(24px, 4vw, 72px);
  align-items: end;
  margin-block: clamp(34px, 3.8vw, 50px) clamp(26px, 2.4vw, 34px);
}
.cs-title { font-size: clamp(3rem, 3.8vw + 1.1rem, 5rem); line-height: 1.14; font-weight: 700; }
.cs-sub { margin-block-start: 12px; }

.cs-facts {
  display: flex; flex-wrap: wrap; gap: 18px 52px;
  padding-block: 20px;
  border-block: 1px solid var(--line);
}
.cs-facts div { display: flex; flex-direction: column; align-items: flex-start; gap: 5px; }
.cs-facts dt {
  font-family: var(--mono); direction: ltr; unicode-bidi: isolate;
  font-size: .62rem; letter-spacing: .18em; text-transform: uppercase;
  color: var(--copper-lt);
}
.cs-facts dd { margin: 0; font-size: .98rem; font-weight: 500; }

/* Full-bleed lead plate */
.cs-plate {
  margin-block-start: clamp(30px, 4vw, 54px);
  margin-inline: calc(var(--pad) * -1);
}
.cs-plate .shot { aspect-ratio: 16 / 7.6; }

/* ---------------- Section shell ---------------- */
.cs { padding-block: clamp(60px, 5.6vw, 84px); padding-inline: var(--pad); overflow-x: clip; }
.cs-inner { max-width: var(--container); margin-inline: auto; }
.cs--s1 { background: var(--s1); }
.cs--s2 { background: var(--s2); }
.cs-head { margin-block-end: clamp(28px, 2.9vw, 40px); }
.cs-h { font-size: clamp(1.5rem, 1.0vw + 1.05rem, 1.95rem); line-height: 1.42; font-weight: 600; max-width: 22ch; }

/* ---------------- Lede ---------------- */
.cs-lede {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(20px, 3.4vw, 62px);
}

/* ---------------- Challenge list ---------------- */
.cs-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 clamp(24px, 4vw, 68px); }
.cs-list li { padding-block: 26px; border-block-start: 1px solid var(--line); }
.cs-list h3 { font-size: 1.08rem; font-weight: 600; margin-block-end: 9px; }
.cs-list p { font-size: .97rem; line-height: 1.95; color: var(--text-2); }

/* ---------------- Split rows ---------------- */
.cs-split {
  display: grid;
  grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
  gap: clamp(24px, 4vw, 72px);
  align-items: center;
}
.cs-split + .cs-split { margin-block-start: clamp(34px, 3.6vw, 54px); }
.cs-split--flip .cs-split-txt { order: 2; }
.cs-split-txt p { max-width: 44ch; margin-block-start: 12px; }
.cs-split .shot { aspect-ratio: 16 / 10; }

/* ---------------- Booking steps ---------------- */
.cs-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2.6vw, 40px);
}
.cs-step .shot { aspect-ratio: 620 / 1133; }
.cs-step figcaption {
  display: grid; grid-template-columns: auto 1fr; gap: 3px 12px;
  margin-block-start: 18px; align-items: baseline;
}
.cs-step .n { font-size: .95rem; color: var(--copper); }
.cs-step .t { font-size: 1.05rem; font-weight: 600; }
.cs-step .d { grid-column: 2; font-size: .9rem; line-height: 1.9; color: var(--text-2); }

.cs-points {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(18px, 2.6vw, 44px);
  margin-block-start: clamp(38px, 3.6vw, 50px);
  padding-block-start: 24px;
  border-block-start: 1px solid var(--line);
}
.cs-points h3 { font-size: 1rem; font-weight: 600; margin-block-end: 7px; }
.cs-points p { font-size: .92rem; line-height: 1.9; color: var(--text-2); }

/* ---------------- Admin — no screenshots published ---------------- */
.cs-admin { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: clamp(24px, 4vw, 72px); }
.cs-admin-list li {
  display: grid; grid-template-columns: auto 1fr; gap: 4px 14px;
  padding-block: 20px; border-block-start: 1px solid var(--line);
}
.cs-admin-list li:last-child { border-block-end: 1px solid var(--line); }
.cs-admin-list .mk { width: 14px; height: 4px; background: var(--teal); margin-block-start: 11px; }
.cs-admin-list h3 { font-size: 1.02rem; font-weight: 600; }
.cs-admin-list p { grid-column: 2; font-size: .93rem; line-height: 1.9; color: var(--text-2); }
.cs-note {
  margin-block-start: 26px; padding: 14px 16px;
  border-inline-start: 2px solid var(--teal);
  background: var(--s2); color: var(--text-2);
  font-size: .89rem; line-height: 1.9;
}

/* ---------------- Responsive pair ---------------- */
.cs-resp { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, .3fr); gap: clamp(20px, 3vw, 48px); align-items: end; }
.cs-resp .a .shot { aspect-ratio: 16 / 10; }
.cs-resp .b .shot { aspect-ratio: 620 / 1133; }
.cs-cap { margin-block-start: 24px; max-width: 54ch; }

/* ---------------- Outcome ---------------- */
.cs-outcome li {
  display: flex; align-items: center; gap: 16px;
  padding-block: 22px; border-block-start: 1px solid var(--line);
  font-size: clamp(1rem, .7vw + .88rem, 1.22rem);
}
.cs-outcome li:last-child { border-block-end: 1px solid var(--line); }
.cs-outcome .mk { width: 18px; height: 5px; background: var(--copper); flex-shrink: 0; }

/* ---------------- Live ---------------- */
.cs-live { position: relative; overflow: hidden; padding-block: clamp(64px, 7.2vw, 96px); padding-inline: var(--pad); }
.cs-live-bg { position: absolute; inset: 0; z-index: 1; }
.cs-live-bg .ph { position: absolute; inset: 0; }
.cs-live-bg::after {
  content: '';
  position: absolute; inset: 0; z-index: 2;
  background: linear-gradient(to bottom, rgba(11,12,12,.70), rgba(11,12,12,.85));
}
.cs-live-inner { position: relative; z-index: 3; max-width: var(--container); margin-inline: auto; }
.cs-live-title {
  font-family: var(--mono); direction: ltr; unicode-bidi: isolate;
  font-size: clamp(1.4rem, 2vw + .7rem, 2.4rem); letter-spacing: .04em;
  font-weight: 700; margin-block: 12px 30px;
}

/* ===================================================
   Mobile
=================================================== */
@media (max-width: 780px) {
  .cs-hero { padding: calc(var(--header-h) + 22px) var(--pad) 0; }
  .cs-title-row {
    grid-template-columns: 1fr; gap: 16px; align-items: start;
    margin-block: 24px 22px;
  }
  .cs-facts { gap: 14px 30px; }
  .cs-plate .shot { aspect-ratio: 4 / 3; }

  .cs { padding-block: 52px; }
  .cs-lede { grid-template-columns: 1fr; gap: 14px; }
  .cs-list { grid-template-columns: 1fr; }
  .cs-list li { padding-block: 20px; }

  .cs-split, .cs-split--flip { grid-template-columns: 1fr; gap: 20px; }
  .cs-split--flip .cs-split-txt { order: 0; }
  .cs-split-txt p { max-width: none; }

  /* Steps scroll horizontally so each phone stays legible */
  .cs-steps {
    grid-template-columns: repeat(3, 62vw);
    gap: 14px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    margin-inline: calc(var(--pad) * -1);
    padding-inline: var(--pad);
    padding-block-end: 6px;
  }
  .cs-step { scroll-snap-align: start; }

  .cs-points { grid-template-columns: 1fr; gap: 20px; margin-block-start: 34px; padding-block-start: 22px; }
  .cs-admin { grid-template-columns: 1fr; gap: 22px; }
  .cs-resp { grid-template-columns: 1fr; gap: 18px; }
  .cs-resp .b { max-width: 56%; }

  .back-link { position: relative; }
  .back-link::after {
    content: '';
    position: absolute; inset-inline: 0;
    inset-block-start: 50%; height: 44px; transform: translateY(-50%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .back-link, .back-link .ar { transition: none !important; }
  .cs-steps { scroll-snap-type: none; }
}

/* ===================================================
   SAYEH case study — additions
=================================================== */

/* Concept disclosure, directly under the hero facts */
.cs-concept {
  display: flex; align-items: flex-start; gap: 14px;
  margin-block-start: clamp(20px, 2.2vw, 30px);
  padding: 16px 18px;
  border-inline-start: 2px solid var(--teal);
  background: var(--s1);
  max-width: 78ch;
  font-size: 0.95rem; line-height: 2; color: var(--text-2);
}
.cs-concept b { color: var(--text); font-weight: 600; }
.cs-concept .mk {
  width: 14px; height: 4px; background: var(--teal);
  margin-block-start: .88em; flex-shrink: 0;
}

.cs-head-sub { margin-block-start: 14px; max-width: 62ch; }

/* ---------------- Booking flow — wide desktop frames ----------------
   NAVA stacks three portrait phone shots; SAYEH's booking is a desktop
   layout, so each step gets a full-width frame with the note beside it. */
.cs-flow { display: grid; gap: clamp(30px, 3.4vw, 52px); }
.cs-flow-row {
  display: grid;
  grid-template-columns: minmax(0, 1.32fr) minmax(0, .68fr);
  gap: clamp(20px, 3vw, 52px);
  align-items: center;
}
.cs-flow-row figure { position: relative; }
.cs-flow-row .shot img { height: auto; }
.cs-flow-txt { display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; align-items: baseline; }
.cs-flow-txt .n {
  font-family: var(--mono); font-size: 1.05rem; font-weight: 700;
  color: var(--copper);
}
.cs-flow-txt h3 { margin: 0; }
.cs-flow-txt p { grid-column: 2; margin-block-start: 10px; }

/* ---------------- Spec rail ---------------- */
.cs-specs {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 32px);
  margin-block-start: clamp(30px, 3.2vw, 44px);
  padding-block-start: 24px;
  border-block-start: 1px solid var(--line);
}
.cs-specs li { display: flex; flex-direction: column; gap: 7px; }
.cs-specs .k { font-size: .78rem; color: var(--teal-lt); }
.cs-specs .v { font-size: 1rem; font-weight: 500; line-height: 1.7; }

/* ---------------- Two-column hardening list ---------------- */
.cs-admin-list--two { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 clamp(24px, 4vw, 68px); }
.cs-admin-list--two li:nth-last-child(2) { border-block-end: 1px solid var(--line); }

.cs-note--wide { max-width: 78ch; margin-block-start: clamp(30px, 3.2vw, 44px); }

@media (max-width: 1024px) {
  .cs-specs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 780px) {
  .cs-concept { padding: 14px 15px; gap: 11px; font-size: .9rem; }
  .cs-flow { gap: 34px; }
  .cs-flow-row { grid-template-columns: 1fr; gap: 16px; align-items: start; }
  .cs-specs { grid-template-columns: 1fr; gap: 16px; margin-block-start: 26px; padding-block-start: 20px; }
  .cs-admin-list--two { grid-template-columns: 1fr; }
  .cs-admin-list--two li:nth-last-child(2) { border-block-end: 0; }
  .cs-admin-list--two li:last-child { border-block-end: 1px solid var(--line); }
}

/* Desktop plus two phones — the booking calendar reflows differently
   from the homepage, so both are worth showing. */
.cs-resp--trio { grid-template-columns: minmax(0, 1fr) minmax(0, .3fr) minmax(0, .3fr); }
@media (max-width: 780px) {
  .cs-resp--trio { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cs-resp--trio .a { grid-column: 1 / -1; }
  .cs-resp--trio .b { max-width: none; }
}