/* ============================================================
   PORTFOLIO — CASE STUDY CSS
   ============================================================ */

/* ── Case Study Layout ────────────────────────────────────── */
.cs-page {
  padding-top: var(--nav-height);
}

/* ── 1. Hook / Hero ───────────────────────────────────────── */
.cs-hook {
  padding: var(--space-16) 0 var(--space-12);
}

.cs-hook__inner {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-16);
  align-items: start;
}

.cs-hook__left { }

.cs-hook__category {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-6);
}

.cs-hook__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.25vw, 2.25rem);
  font-weight: 650;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--text);
  margin-bottom: var(--space-4);
  white-space: nowrap;
}

.cs-hook__subtitle {
  font-family: var(--font-body);
  font-size: clamp(1.0625rem, 1.5vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 520px;
}

.cs-hook__signature {
  font-family: var(--font-display);
  font-size: clamp(1rem, 1.4vw, 1.1875rem);
  font-weight: 300;
  font-style: italic;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
  border-left: 2px solid var(--border);
  padding-left: var(--space-4);
}

.cs-hook__right {
  padding-top: var(--space-4);
}

.cs-hook__meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.cs-hook__meta-item { }

.cs-hook__meta-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-1);
}

.cs-hook__meta-value {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text);
}

.cs-hook__impact {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  transition: border-color var(--duration-fast) var(--ease);
}
.cs-hook__impact:hover {
  border-color: rgba(255,255,255,0.12);
}
.cs-hook__impact:hover .cs-hook__impact-item {
  color: var(--text);
}

.cs-hook__impact-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-4);
}

.cs-hook__impact-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.cs-hook__impact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  transition: color var(--duration-fast) var(--ease);
}

.cs-hook__impact-item::before {
  content: '–';
  color: var(--accent);
  font-size: 0.875rem;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ── Hero Image (legacy single image) ─────────────────────── */
.cs-hero-image {
  width: 100%;
  margin-bottom: var(--space-32);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-surface);
}

.cs-hero-image img {
  width: 100%;
  height: auto;
  display: block;
}

.cs-hero-image-placeholder {
  aspect-ratio: 16 / 7;
  background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-elevated) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* ── Hero Bento Scroll Grid ───────────────────────────────── */
.cs-bento-scroll {
  /* Tall enough to give the scroll animation room to breathe */
  height: 175vh;
  margin-bottom: var(--space-32);
  position: relative;
}

.cs-bento-sticky {
  position: sticky;
  top: var(--nav-height);
  /* Height is driven by the grid's aspect-ratio, not the viewport */
  height: auto;
  overflow: hidden;
}

.cs-bento-grid {
  width: 100%;
  display: grid;
  /* 3 cols left + 5 cols right (video cell) */
  grid-template-columns: repeat(8, 1fr);
  /* 5fr 5fr 4fr 4fr rows maintain proportions at every screen width */
  grid-template-rows: 5fr 5fr 4fr 4fr;
  gap: 0.625rem;
  /* aspect-ratio drives height from width so all cells scale together.
     Derived: at 1136px container, grid height = 797px for video to fit at 1.617:1.
     This replaces the viewport-dependent height and fixes clipping at all sizes. */
  aspect-ratio: 1136 / 797;
}

/* ── Cell positions ──
   Col split: 1–3 = left (3 cols), 4–8 = right (5 cols, video side)
   Row split: 1–2 = 5fr each (video rows), 3–4 = 4fr each

   Cell 1 — portrait left    (cols 1–4, rows 1–4): 420×616px, ratio 0.68:1
   Cell 2 — VIDEO landscape  (cols 4–9, rows 1–3): 706×436px, ratio 1.619:1 ✓
   Cell 3 — landscape bottom (cols 4–7, rows 3–5): 420×350px, ratio 1.20:1
   Cell 4 — portrait bottom  (cols 7–9, rows 3–5): 277×350px, ratio 0.79:1
   Cell 5 — wide strip       (cols 1–4, rows 4–5): 420×170px, ratio 2.47:1  ── */
.cs-bento-cell--1 { grid-column: 1 / 4; grid-row: 1 / 4; }
.cs-bento-cell--2 { grid-column: 4 / 9; grid-row: 1 / 3; }
.cs-bento-cell--3 { grid-column: 4 / 7; grid-row: 3 / 5; }
.cs-bento-cell--4 { grid-column: 7 / 9; grid-row: 3 / 5; }
.cs-bento-cell--5 { grid-column: 1 / 4; grid-row: 4 / 5; }

/* ── AQC bento variant — mirrored layout (video left, portrait right) ─
   Mirrors the default grid so the large landscape cell is on the LEFT.
   Cell 1 — portrait right   (cols 6–9, rows 1–4)
   Cell 2 — VIDEO left       (cols 1–6, rows 1–3)
   Cell 3 — bottom-left      (cols 1–4, rows 3–5)
   Cell 4 — bottom-mid       (cols 4–6, rows 3–5)
   Cell 5 — wide strip right (cols 6–9, rows 4–5)              ── */
.cs-bento-grid--aqc .cs-bento-cell--1 { grid-column: 6 / 9; grid-row: 1 / 4; }
.cs-bento-grid--aqc .cs-bento-cell--2 { grid-column: 1 / 6; grid-row: 1 / 3; }
.cs-bento-grid--aqc .cs-bento-cell--3 { grid-column: 1 / 4; grid-row: 3 / 5; }
.cs-bento-grid--aqc .cs-bento-cell--4 { grid-column: 4 / 6; grid-row: 3 / 5; }
.cs-bento-grid--aqc .cs-bento-cell--5 { grid-column: 6 / 9; grid-row: 4 / 5; }

/* ── Qiddiya bento variant — 3 top + 1 full-width landscape ── */
.cs-bento-grid--qiddiya {
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  height: calc(100vh - var(--nav-height));
}

.cs-bento-grid--qiddiya .cs-bento-cell--1 { grid-column: 1; grid-row: 1; }
.cs-bento-grid--qiddiya .cs-bento-cell--2 { grid-column: 2; grid-row: 1; }
.cs-bento-grid--qiddiya .cs-bento-cell--3 { grid-column: 1; grid-row: 2; }
.cs-bento-grid--qiddiya .cs-bento-cell--4 { grid-column: 2; grid-row: 2; }

/* AQC cell 3 — no frame so the PNG's brand edges show naturally */
.cs-bento-grid--aqc .cs-bento-cell--3 {
  border: none;
  border-radius: 0;
  background: transparent;
  overflow: visible;
}

/* ── Cell base styles ── */
.cs-bento-cell {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  /* Initial state is set & driven by JS — no CSS transition */
  will-change: transform, opacity;
  transform-origin: center center;
}

.cs-bento-cell img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Videos use contain so ratio-sensitive content (logos, UI) never gets clipped.
   The cell's dark background fills any letterbox space invisibly. */
.cs-bento-cell video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: var(--bg-surface);
}

/* Bento videos fill their card edge-to-edge */
.cs-bento-cell--1 video,
.cs-bento-cell--2 video,
.cs-bento-cell--3 video,
.cs-bento-cell--4 video {
  object-fit: cover;
}

.cs-bento-cell__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  text-transform: uppercase;
  background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-elevated) 100%);
}

/* ── Bento scroll: continuous parallax via scroll position ── */
/* (driven by JS in main.js / inline script) */

@media (max-width: 768px) {
  .cs-hook__inner { grid-template-columns: 1fr; }
  .cs-hook__title { white-space: normal; font-size: clamp(1.5rem, 5vw, 2rem); }

  .cs-bento-scroll {
    height: auto;
    margin-bottom: var(--space-16);
  }

  .cs-bento-sticky {
    position: relative;
    top: auto;
    height: auto;
    overflow: visible;
  }

  .cs-bento-grid {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto;
    aspect-ratio: unset;
    gap: 0.5rem;
  }

  .cs-bento-cell--1 { grid-column: 1 / 3; grid-row: auto; aspect-ratio: 16 / 9; order: 2; }
  .cs-bento-cell--2 { grid-column: 1 / 3; grid-row: auto; aspect-ratio: 2878 / 1780; order: 1; }
  .cs-bento-cell--3 { grid-column: 1 / 2; grid-row: auto; aspect-ratio: 1; order: 3; }
  .cs-bento-cell--4 { grid-column: 2 / 3; grid-row: auto; aspect-ratio: 1; order: 4; }
  .cs-bento-cell--4 img { object-position: bottom; }
  .cs-bento-cell--5 { grid-column: 1 / 3; grid-row: auto; aspect-ratio: 3 / 1; order: 5; }
  .cs-bento-cell--5 img { object-position: top; }

  .cs-bento-grid--aqc { grid-template-columns: 1fr 1fr; aspect-ratio: unset; }
  .cs-bento-grid--aqc .cs-bento-cell--1 { grid-column: 1 / -1; grid-row: auto; aspect-ratio: 16 / 9; order: 20; }
  .cs-bento-grid--aqc .cs-bento-cell--1 img { width: 100%; object-fit: cover; }
  .cs-bento-grid--aqc .cs-bento-cell--2 { grid-column: 1 / -1; grid-row: auto; aspect-ratio: 16 / 9; order: 10; }
  /* Restore containment — transparent bleed-out doesn't work in tight mobile grid */
  .cs-bento-grid--aqc .cs-bento-cell--3 {
    grid-column: 1 / 2; grid-row: auto; aspect-ratio: 1;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    order: 50;
  }
  .cs-bento-grid--aqc .cs-bento-cell--4 { grid-column: 1 / -1; grid-row: auto; aspect-ratio: 16 / 9; order: 30; }
  .cs-bento-grid--aqc .cs-bento-cell--5 { grid-column: 2 / 3; grid-row: auto; aspect-ratio: 1; order: 50; }
  .cs-bento-grid--aqc .cs-bento-cell--5 img { object-position: right; }

  .cs-bento-grid--qiddiya { grid-template-columns: 1fr; grid-template-rows: auto; height: auto; }
  .cs-bento-grid--qiddiya .cs-bento-cell--1,
  .cs-bento-grid--qiddiya .cs-bento-cell--2,
  .cs-bento-grid--qiddiya .cs-bento-cell--3 { grid-column: 1; grid-row: auto; aspect-ratio: 16 / 9; }
  .cs-bento-grid--qiddiya .cs-bento-cell--4 { grid-column: 1; grid-row: auto; aspect-ratio: 16 / 9; }

  .cs-bento-cell {
    transform: none !important;
    opacity: 1 !important;
  }
}

/* ── Section Base ─────────────────────────────────────────── */
.cs-section {
  padding: var(--space-16) 0;
  border-top: 1px solid var(--border);
}

/* Inner is now a single column — no wasted sidebar */
.cs-section__inner {
  display: block;
}

/* Sidebar repurposed as inline header row */
.cs-section__sidebar {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.cs-section__number {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  flex-shrink: 0;
}

.cs-section__label {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  color: var(--text);
}

.cs-section__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.cs-section__content { }

/* ── Constraints ──────────────────────────────────────────── */
.cs-constraints {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.cs-constraint {
  padding: var(--space-6);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
}

.cs-constraint__img {
  aspect-ratio: 1484 / 684;
  margin-bottom: var(--space-5);
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
}

.cs-constraint__img img,
.cs-constraint__img video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.cs-constraint__title {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--space-2);
}

.cs-constraint__desc {
  font-family: var(--font-body);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* ── 2. Problem ───────────────────────────────────────────── */
.cs-problem__statement {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2vw, 1.75rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.4;
  color: var(--text);
  margin-bottom: var(--space-12);
}

.word-reveal {
  display: inline;
  color: var(--text-muted);
  transition: color 150ms var(--ease);
}

.word-reveal--lit {
  color: var(--text);
}

.cs-goals {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  margin-bottom: 2.5rem;
}

.cs-goals__block {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
  transition: border-color var(--duration-fast) var(--ease);
}
.cs-goals__block:hover {
  border-color: rgba(255,255,255,0.12);
}
.cs-goals__block .cs-goals__item {
  transition: color var(--duration-fast) var(--ease);
}
.cs-goals__block:hover .cs-goals__item {
  color: var(--text);
}

.cs-goals__label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
}

.cs-goals__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.cs-goals__item {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
}

.cs-goals__item::before {
  content: '·';
  color: var(--accent);
  flex-shrink: 0;
}

.cs-hmw {
  background: linear-gradient(135deg,
    rgba(255, 98, 0, 0.06) 0%,
    rgba(255, 98, 0, 0.02) 100%);
  border: 1px solid rgba(255, 98, 0, 0.15);
  border-radius: var(--radius-md);
  padding: var(--space-8);
}

.cs-hmw__label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-3);
}

.cs-hmw__text {
  font-family: var(--font-display);
  font-size: clamp(1.0625rem, 1.5vw, 1.25rem);
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.45;
  color: var(--text);
  font-style: italic;
}

/* ── 3. Role ──────────────────────────────────────────────── */
.cs-role__list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.cs-role__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: 1.25rem var(--space-6);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  transition: border-color var(--duration-fast) var(--ease),
              background var(--duration-fast) var(--ease),
              color var(--duration-fast) var(--ease),
              font-weight var(--duration-fast) var(--ease);
}

.cs-role__item:hover {
  border-color: rgba(255,255,255,0.12);
  color: var(--text);
}

[data-theme="light"] .cs-role__item:hover {
  color: #0a0a0a;
}

.cs-role__item-icon {
  color: var(--accent);
  font-size: 0.875rem;
  flex-shrink: 0;
}

/* ── 4. Strategy ──────────────────────────────────────────── */
.cs-strategy__intro {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 3rem;
  max-width: 72ch;
}

.cs-strategy__pillars {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-10);
}


.cs-strategy__pillar {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  transition: border-color var(--duration-fast) var(--ease);
}
.cs-strategy__pillar:hover {
  border-color: rgba(255,255,255,0.12);
}

.cs-strategy__pillar-num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: var(--space-3);
}

.cs-strategy__pillar-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text);
  margin-bottom: var(--space-2);
}

.cs-strategy__pillar-subtitle {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Structure diagram */
.cs-diagram-wrap {
  border-radius: var(--radius-md);
  overflow: hidden;
}

.cs-diagram-img {
  width: 100%;
  display: block;
}

.cs-ds-img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-sm);
  display: block;
}

.cs-diagram-placeholder {
  aspect-ratio: 16 / 7;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ── 5. Design System ─────────────────────────────────────── */
.cs-ds-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.cs-ds-block {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
}

.cs-ds-block .cs-ds-img {
  margin-top: auto;
}

.cs-ds-block__label {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: var(--space-3);
}

.cs-ds-block__body {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.cs-ds-block__body + .cs-ds-block__body {
  margin-bottom: var(--space-4);
}

.cs-ds-placeholder {
  aspect-ratio: 4 / 3;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ── 6. Key Components ────────────────────────────────────── */
.cs-components {
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
}

.cs-component {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
  padding: 2.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
  transition: border-color var(--duration-fast) var(--ease);
}
.cs-component:hover {
  border-color: rgba(255,255,255,0.12);
}

.cs-component--reverse {
  direction: rtl;
}
.cs-component--reverse > * { direction: ltr; }

.cs-component__info { }

.cs-component__num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: var(--space-3);
}

.cs-component__name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: var(--space-6);
}

.cs-component__problem,
.cs-component__solution {
  margin-bottom: var(--space-6);
}

.cs-component__sub-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}

.cs-component__text {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.cs-component__solution .cs-component__text + .cs-component__text {
  margin-top: var(--space-4);
}

.cs-component__why {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.cs-component__why-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--text-secondary);
}
.cs-component__why-item::before {
  content: '✓';
  color: var(--accent);
  font-size: 0.75rem;
  flex-shrink: 0;
}

.cs-component__visual {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
}

.cs-component__img {
  width: 100%;
  height: auto;
  display: block;
  transform: scale(1.015);
  transform-origin: center;
}

.cs-component__visual-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ── 7. Interaction Design ────────────────────────────────── */
.cs-interactions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
}

.cs-interaction-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
  transition: border-color 200ms var(--ease), box-shadow 200ms var(--ease);
}
.cs-interaction-card:hover {
  border-color: rgba(255,255,255,0.14);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.06), 0 4px 24px rgba(0,0,0,0.25);
}

.cs-interaction-card__visual {
  aspect-ratio: 16 / 10;
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  overflow: hidden;
}

.cs-interaction-card__visual video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.cs-interaction-card__body {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.cs-interaction-card__name {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--space-2);
}

.cs-interaction-card__desc {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-3);
}

.cs-interaction-card__desc:last-child {
  margin-bottom: 0;
}

.cs-interaction-card__why {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-4);
  border-top: 1px solid var(--border);
}

.cs-interaction-card__why-item {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  padding-left: var(--space-4);
  position: relative;
}

.cs-interaction-card__why-item::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ── 8. Design Decisions ──────────────────────────────────── */
.cs-decisions {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.cs-decision {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  display: grid;
  grid-template-columns: 380px 1fr;
  align-items: stretch;
  gap: 0 var(--space-8);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
  transition: border-color var(--duration-fast) var(--ease);
}
.cs-decision:hover {
  border-color: rgba(255,255,255,0.12);
}
.cs-decision .cs-decision__text {
  transition: color var(--duration-fast) var(--ease);
}
.cs-decision:hover .cs-decision__text {
  color: var(--text);
}

.cs-decision__img-block {
  grid-column: 1;
  min-height: 0;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
}

.cs-decision__content {
  grid-column: 2;
  display: flex;
  flex-direction: column;
}

.cs-decision__label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-3);
}

.cs-decision__img-block img,
.cs-decision__img-block video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.cs-decision__text {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

.cs-decision__text:last-child {
  margin-bottom: 0;
}

.cs-decision__text strong {
  color: var(--text);
  font-weight: 500;
}

/* ── 9. Outcomes ──────────────────────────────────────────── */
.cs-outcomes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
  margin-bottom: 2.5rem;
}

.cs-outcome-stat {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  text-align: center;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
  transition: border-color 200ms var(--ease);
}
.cs-outcome-stat:hover {
  border-color: rgba(255,255,255,0.12);
}

.cs-outcome-stat__value {
  font-family: var(--font-display);
  font-size: clamp(1.125rem, 1.5vw, 1.375rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--text);
  margin-bottom: var(--space-2);
}

.cs-outcome-stat__label {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--duration-fast) var(--ease);
}
.cs-outcome-stat:hover .cs-outcome-stat__label {
  color: var(--text);
}

.cs-outcomes-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.cs-outcomes-list__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.cs-outcomes-list__item::before {
  content: '–';
  color: var(--accent);
  flex-shrink: 0;
}

/* ── 10. Reflection ───────────────────────────────────────── */
.cs-reflection {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-6);
}

.cs-reflection__card {
  padding: var(--space-8);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
}

.cs-reflection__card-num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: var(--space-3);
}

.cs-reflection__card-text {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.cs-reflection__card-text strong {
  color: var(--text);
  font-weight: 500;
  display: block;
  margin-bottom: var(--space-1);
}

/* ── Section closing note — hidden when empty ─────────────── */
.cs-section__note:empty {
  display: none;
}

.cs-section__note {
  margin-top: var(--space-16);
  padding: var(--space-8);
  background: linear-gradient(135deg,
    rgba(255, 98, 0, 0.06) 0%,
    rgba(255, 98, 0, 0.02) 100%);
  border: 1px solid rgba(255, 98, 0, 0.15);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text-secondary);
  font-style: italic;
  transition: color var(--duration-fast) var(--ease),
              background var(--duration-fast) var(--ease),
              border-color var(--duration-fast) var(--ease),
              font-weight var(--duration-fast) var(--ease);
  cursor: default;
}

.cs-section__note:hover {
  color: #fff;
}

[data-theme="light"] .cs-section__note:hover {
  color: #0a0a0a;
}

/* ── Next Case Study CTA ──────────────────────────────────── */
.cs-next {
  margin-top: 80px;
  border-top: 1px solid var(--border);
  padding: var(--space-16) 0;
}

.cs-next__card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: center;
  padding: var(--space-6);
  background: linear-gradient(135deg,
    rgba(255, 98, 0, 0.06) 0%,
    rgba(255, 98, 0, 0.02) 100%);
  border: 1px solid rgba(255, 98, 0, 0.15);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}
.cs-next__card:active { transform: scale(0.99); }

.cs-next__card:hover {
  border-color: rgba(255, 98, 0, 0.3);
}

.cs-next__card:hover .cs-next__card-visual img {
  transform: scale(1.04);
}

.cs-next__label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-3);
}

.cs-next__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.5vw, 3.5rem);
  font-weight: 650;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text);
  margin-bottom: var(--space-4);
}

.cs-next__desc {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-8);
  max-width: 420px;
}

.cs-next__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text);
  transition: gap 0.2s ease, color 0.2s ease;
}

.cs-next__card:hover .cs-next__cta {
  gap: var(--space-3);
  color: var(--accent);
}

.cs-next__card-visual {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  aspect-ratio: 16 / 10;
}

.cs-next__card-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

@media (max-width: 900px) {
  .cs-next__card {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

/* ── Section Stepper ──────────────────────────────────────── */
.cs-stepper {
  position: fixed;
  left: clamp(1rem, 2vw, 2.5rem);
  top: 50%;
  transform: translateY(-50%);
  z-index: 90;
  display: none;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

@media (min-width: 1380px) {
  .cs-stepper { display: block; }
}

.cs-stepper.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.cs-stepper__list {
  list-style: none;
  padding: 0;
  margin: 0;
  position: relative;
  display: flex;
  flex-direction: column;
}

.cs-stepper__list::before {
  content: '';
  position: absolute;
  left: 3px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--border);
}

.cs-stepper__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 5px 0;
  text-decoration: none;
}

.cs-stepper__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--border);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
  transition: background 0.25s, transform 0.25s, box-shadow 0.25s;
}

.cs-stepper__label {
  font-size: 0.6875rem;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--text-secondary);
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 0.2s, transform 0.2s;
  pointer-events: none;
}

.cs-stepper__link:hover .cs-stepper__label {
  opacity: 1;
  transform: translateX(0);
}

.cs-stepper__link:hover .cs-stepper__dot {
  background: var(--text-secondary);
}

.cs-stepper__item.is-active .cs-stepper__dot {
  background: var(--accent);
  transform: scale(1.5);
  box-shadow: 0 0 0 3px rgba(255, 98, 0, 0.15);
}

.cs-stepper__item.is-active .cs-stepper__label {
  opacity: 1;
  transform: translateX(0);
  color: var(--accent);
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 900px) {
  .cs-hook__inner {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }

  .cs-constraints {
    grid-template-columns: 1fr 1fr;
  }

  .cs-goals {
    grid-template-columns: 1fr;
  }

  .cs-role__list {
    grid-template-columns: 1fr;
  }

  .cs-strategy__pillars {
    grid-template-columns: 1fr 1fr;
  }

  .cs-decision {
    grid-template-columns: 1fr;
  }

  .cs-decision__img-block {
    grid-row: auto;
    aspect-ratio: 16 / 7;
    margin-bottom: var(--space-5);
  }

  .cs-decision__content {
    grid-column: 1;
  }

  .cs-component {
    grid-template-columns: 1fr;
  }

  .cs-component--reverse { direction: ltr; }

  .cs-ds-grid {
    grid-template-columns: 1fr;
  }

  .cs-next__card {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

@media (max-width: 640px) {
  .cs-hook {
    padding: var(--space-10) 0 var(--space-8);
  }

  .cs-hook__meta {
    grid-template-columns: 1fr 1fr;
  }

  .cs-constraints {
    grid-template-columns: 1fr;
  }

  .cs-outcomes {
    grid-template-columns: 1fr;
  }

  .cs-outcome-stat {
    padding: var(--space-5);
  }

  .cs-strategy__pillars {
    grid-template-columns: 1fr;
  }

  .cs-interactions {
    grid-template-columns: 1fr;
  }

  .cs-reflection {
    grid-template-columns: 1fr;
  }

  .cs-section {
    padding: var(--space-12) 0;
  }

  .cs-decision {
    padding: var(--space-4);
  }

  .cs-component {
    padding: var(--space-6);
  }

  .cs-goals__block {
    padding: var(--space-5);
  }

  .cs-hmw {
    padding: var(--space-5);
  }

  /* Next case study section */
  .cs-next {
    margin-top: var(--space-16);
    padding: var(--space-10) 0;
  }
  .cs-next__title {
    font-size: clamp(1.5rem, 7vw, 2.25rem);
  }
  .cs-next__desc {
    margin-bottom: var(--space-4);
  }
  .cs-next__card {
    padding: var(--space-5);
  }
}