/* ── Case Study Pages — Shared Styles ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:       #0d0d0d;
  --surface:  #141414;
  --border:   rgba(255,255,255,0.08);
  --white:    #f5f3ef;
  --off:      rgba(245,243,239,0.55);
  --dim:      rgba(245,243,239,0.75);
  --accent:   #c9a96e;
  --serif:    'Cormorant Garamond', Georgia, serif;
  --sans:     'Space Grotesk', system-ui, sans-serif;
}

html { background: var(--bg); color: var(--white); font-family: var(--sans); scroll-behavior: smooth; }
body { background: var(--bg); }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* ── NAV ── */
.cs-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.4rem 2.5rem;
  background: linear-gradient(to bottom, rgba(13,13,13,0.9) 0%, transparent 100%);
  backdrop-filter: blur(0px);
  transition: backdrop-filter 0.3s, background 0.3s;
}

.cs-nav.scrolled {
  background: rgba(13,13,13,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.cs-nav__back {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--off);
  transition: color 0.2s;
}

.cs-nav__back:hover { color: var(--white); }

.cs-nav__back svg { width: 14px; height: 14px; opacity: 0.6; transition: opacity 0.2s, transform 0.2s; }
.cs-nav__back:hover svg { opacity: 1; transform: translateX(-3px); }

.cs-nav__brand {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
}

.cs-nav__index {
  font-family: var(--sans);
  font-size: 0.7rem;
  color: var(--off);
  letter-spacing: 0.08em;
}

/* ── HERO ── */
.cs-hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  overflow: hidden;
}

.cs-hero__image {
  position: absolute;
  inset: 0;
}

.cs-hero__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.cs-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(13,13,13,1) 0%,
    rgba(13,13,13,0.6) 35%,
    rgba(13,13,13,0.2) 70%,
    rgba(13,13,13,0.1) 100%
  );
}

.cs-hero__content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0 2.5rem 3.5rem;
  max-width: 900px;
}

.cs-hero__index {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.cs-hero__title {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(3rem, 8vw, 6.5rem);
  line-height: 0.92;
  color: var(--white);
  margin-bottom: 1.25rem;
}

.cs-hero__meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.cs-hero__rule {
  width: 36px;
  height: 1px;
  background: var(--accent);
  flex-shrink: 0;
}

.cs-hero__descriptor {
  font-family: var(--sans);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.cs-hero__tagline {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.1rem, 2.2vw, 1.5rem);
  font-weight: 300;
  line-height: 1.5;
  color: rgba(245,243,239,0.85);
  max-width: 600px;
}

/* ── SUMMARY STRIP ── */
.cs-summary {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 2rem 2.5rem;
  display: flex;
  gap: 3rem;
  flex-wrap: wrap;
}

.cs-summary__item { }

.cs-summary__label {
  font-family: var(--sans);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.35rem;
}

.cs-summary__value {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--white);
}

/* ── QUICK TAKE (AI extraction block) ── */
.cs-quick-take {
  padding: 3.5rem 2.5rem;
  max-width: 800px;
}

.cs-quick-take__label {
  font-family: var(--sans);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.cs-quick-take__label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
  max-width: 60px;
}

.cs-quick-take__body {
  font-family: var(--serif);
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  font-weight: 300;
  line-height: 1.65;
  color: var(--dim);
}

/* ── CASE SECTIONS ── */
.cs-body {
  padding: 0 2.5rem 4rem;
}

.cs-sections {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  margin-bottom: 2px;
}

.cs-section {
  background: var(--surface);
  padding: 2.5rem;
}

.cs-section--full {
  grid-column: 1 / -1;
}

.cs-section__label {
  font-family: var(--sans);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.cs-section__heading {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.5rem;
  color: var(--white);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.cs-section__body {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 300;
  line-height: 1.75;
  color: var(--dim);
}

/* ── GALLERY ── */
.cs-gallery {
  margin: 2px 0;
}

.cs-gallery__grid {
  display: grid;
  gap: 2px;
}

.cs-gallery__grid--2 { grid-template-columns: 1fr 1fr; }
.cs-gallery__grid--3 { grid-template-columns: 1fr 1fr 1fr; }
.cs-gallery__grid--auto { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }

.cs-gallery__item {
  overflow: hidden;
  background: var(--surface);
  aspect-ratio: 4/3;
}

.cs-gallery__item.tall { aspect-ratio: 3/4; }
.cs-gallery__item.wide { grid-column: span 2; aspect-ratio: 16/7; }
.cs-gallery__item.square { aspect-ratio: 1; }

.cs-gallery__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s ease;
}

.cs-gallery__item:hover img { transform: scale(1.03); }

/* ── FAQ (AI extraction) ── */
.cs-faq {
  padding: 4rem 2.5rem;
  max-width: 780px;
}

.cs-faq__heading {
  font-family: var(--serif);
  font-weight: 300;
  font-size: 2rem;
  color: var(--white);
  margin-bottom: 2.5rem;
}

.cs-faq__item {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
}

.cs-faq__item:last-child { border-bottom: 1px solid var(--border); }

.cs-faq__q {
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--white);
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.cs-faq__a {
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 300;
  line-height: 1.7;
  color: var(--dim);
}

/* ── NEXT PROJECT / CTA ── */
.cs-next {
  border-top: 1px solid var(--border);
}

.cs-next__label {
  padding: 2rem 2.5rem 1rem;
  font-family: var(--sans);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--off);
}

.cs-next__projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2px;
}

.cs-next__project {
  position: relative;
  overflow: hidden;
  background: var(--surface);
  aspect-ratio: 4/3;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.25rem;
}

.cs-next__project img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.cs-next__project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(13,13,13,0.85) 0%, transparent 60%);
  transition: opacity 0.3s;
}

.cs-next__project:hover img { transform: scale(1.05); }

.cs-next__project-content {
  position: relative;
  z-index: 1;
}

.cs-next__project-num {
  font-family: var(--sans);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 0.3rem;
}

.cs-next__project-name {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--white);
}

/* ── CTA BLOCK ── */
.cs-cta {
  padding: 5rem 2.5rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

.cs-cta__heading {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(1.8rem, 4vw, 3rem);
  color: var(--white);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.cs-cta__heading em { font-style: italic; color: var(--accent); }

.cs-cta__sub {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--off);
  margin-bottom: 2rem;
}

.cs-cta__btn {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--white);
  padding: 1rem 2.5rem;
  transition: background 0.2s, color 0.2s;
}

.cs-cta__btn:hover { background: var(--accent); color: var(--bg); }

/* ── FOOTER ── */
.cs-footer {
  padding: 1.5rem 2.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cs-footer__brand {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--off);
}

.cs-footer__link {
  font-family: var(--sans);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.05em;
  transition: opacity 0.2s;
}

.cs-footer__link:hover { opacity: 0.7; }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .cs-nav { padding: 1.2rem 1.25rem; }
  .cs-hero__content { padding: 0 1.25rem 2.5rem; }
  .cs-summary { padding: 1.5rem 1.25rem; gap: 1.5rem; }
  .cs-quick-take { padding: 2.5rem 1.25rem; }
  .cs-body { padding: 0 1.25rem 3rem; }
  .cs-sections { grid-template-columns: 1fr; }
  .cs-section--full { grid-column: 1; }
  .cs-gallery__grid--2,
  .cs-gallery__grid--3 { grid-template-columns: 1fr; }
  .cs-gallery__item.wide { grid-column: 1; aspect-ratio: 4/3; }
  .cs-faq { padding: 3rem 1.25rem; }
  .cs-next__projects { grid-template-columns: 1fr 1fr; }
  .cs-cta { padding: 3.5rem 1.25rem; }
  .cs-footer { padding: 1.25rem; }
}