/* ===========================================================================
   Project (case study) — index grid + single case-study layout
   =========================================================================== */

/* ---------- Index Page ---------- */
.proj-intro {
  text-align: center;
  padding: clamp(5rem, 4rem + 5vw, 8rem) 0 clamp(2rem, 1rem + 2vw, 4rem);
  position: relative;
  overflow: hidden;
}
.proj-intro::before {
  content: '';
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 70%;
  background: radial-gradient(ellipse at 50% 0%, rgba(4, 230, 247, 0.12), transparent 65%);
  pointer-events: none;
}
.proj-intro .container { position: relative; z-index: 1; max-width: 900px; }
.proj-intro h1 {
  font-size: clamp(3rem, 2rem + 6vw, 6rem);
  margin-bottom: 1.5rem;
}
.proj-intro .lead {
  max-width: 60ch;
  margin-inline: auto;
}

/* Filter bar */
.proj-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin: clamp(2rem, 1rem + 2vw, 3rem) auto 0;
  padding-inline: var(--gutter);
}
.proj-filter button {
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.5rem 1rem;
  background: transparent;
  color: var(--mute);
  border: 1px solid var(--ink-3);
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease), background 0.15s var(--ease);
}
.proj-filter button:hover {
  color: var(--white);
  border-color: var(--mute);
}
.proj-filter button.is-active {
  color: var(--black);
  background: var(--gradient);
  border-color: transparent;
}

/* Grid */
.proj-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  padding-block: clamp(3rem, 2rem + 3vw, 5rem) clamp(4rem, 2rem + 5vw, 8rem);
}

.proj-card {
  display: block;
  background: var(--ink-2);
  border: 1px solid var(--ink-3);
  border-radius: 6px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
  position: relative;
  overflow: hidden;
  isolation: isolate;
}
.proj-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-diag);
  opacity: 0;
  z-index: -1;
  transition: opacity 0.25s var(--ease);
}
.proj-card::after {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--gradient);
  transform: scaleX(0.3);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}
.proj-card:hover {
  transform: translateY(-4px);
  border-color: transparent;
}
.proj-card:hover::after { transform: scaleX(1); }
.proj-card-body {
  padding: 2rem 1.75rem;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  position: relative;
}
.proj-card-cat {
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--teal);
  text-transform: uppercase;
  margin-bottom: 1rem;
  display: inline-block;
}
.proj-card-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 1.2rem + 0.7vw, 1.85rem);
  text-transform: uppercase;
  line-height: 1.02;
  color: var(--white);
  margin: 0 0 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.proj-card-excerpt {
  color: var(--mute);
  font-size: var(--step--1);
  line-height: 1.5;
  margin: 0 0 1.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}
.proj-card-arrow {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--teal);
  transition: transform 0.25s var(--ease), color 0.25s var(--ease);
  align-self: flex-start;
}
.proj-card:hover .proj-card-arrow {
  transform: translateX(6px);
  color: var(--white);
}

.proj-empty {
  text-align: center;
  color: var(--mute);
  padding: 4rem 0;
  grid-column: 1 / -1;
}

/* ---------- Single Case Study Hero (no image — gradient + typography) ---------- */
.cs-hero {
  position: relative;
  isolation: isolate;
  min-height: clamp(55vh, 45vh + 10vw, 70vh);
  display: grid;
  align-items: end;
  overflow: hidden;
  padding-block: clamp(6rem, 4rem + 6vw, 10rem) clamp(3rem, 2rem + 3vw, 5rem);
  background: var(--black);
}
.cs-hero-scrim {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 60% 50% at 15% 100%, rgba(0, 105, 170, 0.55), transparent 70%),
    radial-gradient(ellipse 50% 40% at 85% 10%, rgba(4, 230, 247, 0.25), transparent 65%),
    linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.6) 100%);
}
.cs-hero::after {
  content: '';
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--teal) 30%, var(--blue) 70%, transparent);
  opacity: 0.5;
}
.cs-hero .container { max-width: 900px; }
.cs-hero .breadcrumb {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  color: var(--teal);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  display: inline-flex;
  gap: 0.5rem;
  align-items: center;
}
.cs-hero .breadcrumb a { color: rgba(255,255,255,0.75); transition: color 0.15s var(--ease); }
.cs-hero .breadcrumb a:hover { color: var(--teal); }
.cs-hero h1 {
  font-size: clamp(2.5rem, 1.5rem + 5vw, 5.5rem);
  line-height: 0.98;
  margin: 0;
  max-width: 22ch;
}
.cs-dek {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 0.8rem + 0.7vw, 1.5rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: transparent;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  margin: 0 0 1rem;
  max-width: 32ch;
  line-height: 1.2;
}

/* Body content */
.cs-body {
  padding: clamp(3rem, 2rem + 3vw, 5rem) 0 clamp(4rem, 2rem + 5vw, 7rem);
}
.cs-body .container { max-width: 760px; }

/* Numbered section header (h4 eyebrow + h2 heading combo) */
.cs-section-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.25rem;
  align-items: start;
  margin: 4rem 0 1.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--ink-3);
  position: relative;
}
.cs-section-head:first-child { padding-top: 0; border-top: 0; margin-top: 0; }
.cs-section-head::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 0;
  width: 60px;
  height: 1px;
  background: var(--gradient);
}
.cs-section-head:first-child::before { display: none; }
.cs-section-num {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 1.5rem + 3vw, 4rem);
  line-height: 0.9;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: 0;
}
.cs-section-head h4 {
  margin: 0 0 0.5rem;
}
.cs-section-head h2 {
  margin: 0;
  font-size: clamp(1.75rem, 1.25rem + 2vw, 2.75rem);
  line-height: 1;
}

/* Stat grid (auto-built from ✅ paragraphs) */
.cs-stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 2rem 0 3rem;
}
.cs-stat {
  background: var(--ink-2);
  border: 1px solid var(--ink-3);
  border-radius: 6px;
  padding: 1.5rem 1.25rem;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.cs-stat::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--gradient);
}
.cs-stat-big {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 1.5rem + 2.5vw, 3.5rem);
  line-height: 0.9;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.cs-stat-label {
  font-size: 0.95rem;
  color: var(--white);
  line-height: 1.4;
}
.cs-stat-label.cs-stat-nobig {
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.cs-body h2 {
  font-size: var(--step-3);
  margin: 2.5rem 0 1rem;
  line-height: 1.05;
}
.cs-body h3 {
  font-size: var(--step-2);
  margin: 2rem 0 0.75rem;
  line-height: 1.1;
}
.cs-body h4 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.2em;
  color: var(--teal);
  text-transform: uppercase;
  margin: 3rem 0 0.5rem;
}
.cs-body h4 + h2,
.cs-body h4 + h3 { margin-top: 0.25rem; }
.cs-body p {
  font-size: var(--step-0);
  line-height: 1.7;
  color: var(--mute);
  max-width: 70ch;
  margin: 0 0 1.25rem;
}
.cs-body p strong, .cs-body strong, .cs-body b { color: var(--white); font-weight: 600; }
.cs-body a {
  color: var(--teal);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.cs-body a:hover { color: var(--white); }
.cs-body ul, .cs-body ol {
  margin: 0 0 1.5rem;
  padding-left: 1.25rem;
  color: var(--mute);
  font-size: var(--step-0);
  line-height: 1.7;
}
.cs-body li { margin-bottom: 0.5rem; }
.cs-body ul li::marker { color: var(--teal); }
.cs-body img,
.cs-body .post-figure img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  margin: 2rem 0;
  display: block;
}
.cs-body .post-figure { margin: 2rem 0; }
.cs-body .post-video {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  margin: 2rem 0;
  border-radius: 6px;
  overflow: hidden;
  background: var(--ink-2);
}
.cs-body .post-video iframe,
.cs-body .post-video video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.cs-body blockquote {
  border-left: 2px solid var(--teal);
  margin: 2rem 0;
  padding-left: 1.5rem;
  font-size: var(--step-1);
  color: var(--white);
  line-height: 1.5;
}
.cs-body .post-blurb {
  background: var(--ink-2);
  border: 1px solid var(--ink-3);
  border-radius: 6px;
  padding: 1.5rem;
  margin: 2rem 0;
}
.cs-body .post-blurb img { max-width: 80px; margin: 0 0 1rem; }

/* Related + CTA */
.cs-related {
  padding: clamp(3rem, 2rem + 3vw, 5rem) 0;
  background: var(--ink);
  border-top: 1px solid var(--ink-2);
}
.cs-related h3 {
  text-align: center;
  font-size: var(--step-3);
  margin: 0 0 2rem;
}
.cs-related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}