/* ============================================
   CASE STUDY TEMPLATE
   Shared by every case study page.
   Loaded after style.css (uses its tokens).
   ============================================ */
:root {
  --cs-text: #4A4159;
  --cs-soft: #5F566E;
  --cs-line: rgba(45, 33, 64, 0.14);
  --cs-surface: #F7F5F8;
  --cs-rail: 200px;
}

/* ---- Hero (full-width coloured banner, colours set per page) ---- */
.cs-hero {
  --cs-overlap: 9rem;
  padding-top: 7.5rem;
  margin-bottom: var(--cs-overlap);
  position: relative;
  background:
    radial-gradient(60% 85% at 88% 0%, var(--cs-glow-1, #CFC3F8) 0%, transparent 70%),
    radial-gradient(55% 75% at 0% 100%, var(--cs-glow-2, #F8D9D3) 0%, transparent 70%),
    var(--cs-hero, #EFEBFB);
}

/* Grain texture over the banner */
.cs-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.55 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 220px 220px;
  mix-blend-mode: multiply;
  opacity: 0.3;
  pointer-events: none;
}

.cs-hero-inner {
  position: relative;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s var(--ease-out) 0.1s forwards;
}

/* The hero visual straddles the bottom edge of the banner */
.cs-hero .cs-figure {
  margin-bottom: calc(var(--cs-overlap) * -1);
}

.cs-hero .cs-figure > * {
  box-shadow: 0 30px 60px -30px rgba(45, 33, 64, 0.3);
}

.cs-back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--cs-soft);
  margin-bottom: 2.5rem;
  transition: color 0.25s var(--ease-out);
}

.cs-back:hover {
  color: var(--ink);
}

.cs-eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cs-soft);
  margin-bottom: 1rem;
}

.cs-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.3rem, 4.6vw, 4rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  text-wrap: balance;
  max-width: 17ch;
  margin-bottom: 1.75rem;
}

.cs-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 0;
  list-style: none;
  margin-bottom: 3rem;
  font-size: 1rem;
  letter-spacing: -0.012em;
  color: var(--cs-soft);
}

.cs-meta li {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

/* Plain text separated by a middle dot */
.cs-meta li + li::before {
  content: '·';
  order: -2;
  margin: 0 0.6rem;
  opacity: 0.6;
}

.cs-meta-status::after {
  content: '';
  order: -1;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #4A9B5F;
}

/* ---- Figures & image placeholders ---- */
.cs-figure img,
.cs-figure video {
  display: block;
  width: 100%;
  border-radius: 20px;
}

.cs-figure figcaption {
  font-size: 0.85rem;
  color: var(--ink-muted);
  margin-top: 0.75rem;
}

/* Replace a placeholder with <img src="images/..." alt="..."> once the visual is ready */
.cs-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  aspect-ratio: 16 / 9;
  padding: 1.5rem;
  text-align: center;
  color: var(--cs-soft);
  background: #F6ECEA;
  border: 1.5px dashed rgba(196, 115, 110, 0.55);
  border-radius: 20px;
}

.cs-placeholder--4x3 {
  aspect-ratio: 4 / 3;
}

.cs-placeholder-tag {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-dark);
}

.cs-placeholder-title {
  font-weight: 600;
  font-size: 1rem;
  color: var(--ink);
}

.cs-placeholder-desc {
  font-size: 0.875rem;
  line-height: 1.45;
  max-width: 44ch;
}

/* Marks copy that still needs to be written */
.cs-todo {
  background: rgba(225, 144, 139, 0.18);
  border-bottom: 1px dashed var(--accent-dark);
  border-radius: 3px;
  padding: 0 0.2em;
}

/* ---- Summary (overview, details, problem / solution / result) ---- */
.cs-summary {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 1.5rem;
  padding: 4rem 0 0;
}

.cs-summary-col {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.cs-card {
  background: var(--cs-surface);
  border-radius: 20px;
  padding: 2rem;
}

.cs-card-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 0.9rem;
}

.cs-card p {
  color: var(--cs-text);
  line-height: 1.6;
}

.cs-overview {
  font-size: 1.1rem;
}

.cs-details {
  display: grid;
  gap: 1.1rem;
}

.cs-details dt {
  font-size: 0.8rem;
  color: var(--ink-muted);
}

.cs-details dd {
  font-weight: 500;
  line-height: 1.45;
}

.cs-psr {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.cs-psr-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.45rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 0.6rem;
}

/* ---- Impact ---- */
.cs-impact {
  padding: 4.5rem 0 5rem;
}

.cs-impact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 1.5rem;
}

.cs-stat {
  border-top: 2px solid var(--ink);
  padding-top: 1.25rem;
}

.cs-stat-value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.6rem, 4.4vw, 3.75rem);
  line-height: 1;
  letter-spacing: -0.03em;
  white-space: nowrap;
  margin-bottom: 0.9rem;
}

.cs-stat-value span {
  color: var(--accent-dark);
}

.cs-stat-text {
  color: var(--cs-text);
  line-height: 1.5;
  max-width: 32ch;
}

/* ---- Long-form sections: label rail + content ---- */
.cs-section {
  display: grid;
  grid-template-columns: var(--cs-rail) minmax(0, 1fr);
  gap: 2rem;
  padding: 4.5rem 0;
  border-top: 1px solid var(--cs-line);
}

.cs-label {
  position: sticky;
  top: 6.5rem;
  align-self: start;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.cs-lead {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.45rem, 2.4vw, 1.9rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  text-wrap: pretty;
  max-width: 42ch;
  margin-bottom: 1.5rem;
}

.cs-body {
  max-width: 680px;
}

.cs-body p {
  font-size: 1.075rem;
  color: var(--cs-text);
  line-height: 1.65;
}

.cs-body p + p {
  margin-top: 1rem;
}

.cs-section .cs-figure {
  margin-top: 2.5rem;
}

/* Numbered list (goals, recommendations) */
.cs-list {
  list-style: none;
  counter-reset: cs;
  max-width: 760px;
}

.cs-list li {
  counter-increment: cs;
  display: grid;
  grid-template-columns: 2.75rem 1fr;
  font-size: 1.075rem;
  color: var(--cs-text);
  line-height: 1.5;
  padding: 1.1rem 0;
  border-top: 1px solid var(--cs-line);
}

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

.cs-list li::before {
  content: counter(cs, decimal-leading-zero);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-dark);
  padding-top: 0.2rem;
}

.cs-body + .cs-list {
  margin-top: 2rem;
}

/* Method cards (process) */
.cs-methods {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2.5rem;
}

.cs-method {
  background: var(--cs-surface);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.cs-method-name {
  font-weight: 600;
  margin-bottom: 0.4rem;
}

/* Persona photo at the top of a method card */
.cs-persona-photo {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 1rem;
}

.cs-persona-trait {
  font-size: 0.85rem;
  color: var(--cs-soft);
}

.cs-persona-trait + p {
  margin-bottom: 0.75rem;
}

.cs-method p {
  font-size: 0.95rem;
  color: var(--cs-text);
  line-height: 1.5;
}

.cs-note {
  font-size: 0.95rem;
  color: var(--cs-soft);
  border-left: 2px solid var(--accent);
  padding-left: 1rem;
  margin-top: 2rem;
  max-width: 680px;
}

/* Insights */
.cs-insight {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.cs-insight + .cs-insight {
  margin-top: 4rem;
}

.cs-insight:nth-child(even) .cs-insight-text {
  order: 2;
}

.cs-insight-num {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent-dark);
  margin-bottom: 0.6rem;
}

.cs-insight-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 0.9rem;
}

.cs-insight-text p {
  color: var(--cs-text);
  line-height: 1.65;
}

/* ---- Design showcases (full width) ---- */
.cs-design {
  padding: 4.5rem 0;
  border-top: 1px solid var(--cs-line);
}

.cs-design-head {
  display: grid;
  grid-template-columns: var(--cs-rail) minmax(0, 1fr) minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
  margin-bottom: 2.5rem;
}

.cs-design-head .cs-label {
  position: static;
}

.cs-design-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 2.4vw, 1.9rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.cs-design-head p {
  color: var(--cs-text);
  line-height: 1.65;
}

/* ---- Reflections ---- */
.cs-reflections {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.cs-reflection {
  background: var(--cs-surface);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
}

.cs-reflection-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: 0.7rem;
}

.cs-reflection p {
  color: var(--cs-text);
  line-height: 1.6;
}

/* ---- Bottom navigation ---- */
.cs-next {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 3.5rem 0 5rem;
  border-top: 1px solid var(--cs-line);
}

.cs-next-link {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  letter-spacing: -0.02em;
  transition: color 0.25s var(--ease-out);
}

.cs-next-link:hover {
  color: var(--accent-dark);
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .cs-summary,
  .cs-section,
  .cs-design-head,
  .cs-insight {
    grid-template-columns: 1fr;
  }

  .cs-section,
  .cs-design-head {
    gap: 1.25rem;
  }

  .cs-label {
    position: static;
  }

  .cs-insight {
    gap: 1.5rem;
  }

  .cs-insight:nth-child(even) .cs-insight-text {
    order: 0;
  }

  .cs-impact-grid,
  .cs-methods,
  .cs-reflections {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .cs-hero {
    --cs-overlap: 4rem;
    padding-top: 7rem;
  }

  .cs-section,
  .cs-design {
    padding: 3rem 0;
  }

  .cs-card {
    padding: 1.5rem;
  }

  .cs-placeholder {
    aspect-ratio: 4 / 3;
  }
}