/* ===================================================
   CASE STUDY PAGE STYLES
   Matches the Structured Bento Grid design system
   =================================================== */

/* ==============================
   CASE STUDY HERO
   ============================== */
.cs-hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 100px var(--page-pad) 0;
}

.cs-hero-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  padding: 56px 56px 48px;
  opacity: 0;
  animation: heroReveal 0.9s 0.15s var(--ease-out) forwards;
}

.cs-breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font: 400 12px/1 var(--mono);
  color: var(--muted);
  letter-spacing: 0.04em;
  margin-bottom: 28px;
}

.cs-breadcrumb a {
  color: var(--accent);
  transition: color 0.2s;
}

.cs-breadcrumb a:hover {
  color: var(--fg);
}

.cs-hero-card h1 {
  font: 600 clamp(28px, 4vw, 44px)/1.15 var(--display);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.cs-hero-desc {
  font: 400 16px/1.75 var(--sans);
  color: var(--text);
  max-width: 720px;
  margin-bottom: 36px;
}

/* Meta grid */
.cs-meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  padding-top: 28px;
  border-top: 1px solid var(--card-border);
}

.cs-meta-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.cs-meta-label {
  font: 700 10px/1 var(--mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.cs-meta-value {
  font: 500 14px/1.5 var(--sans);
  color: var(--fg);
}

/* Hero image */
.cs-hero-img {
  max-width: 1200px;
  margin: 24px auto 0;
  padding: 0 var(--page-pad);
}

.cs-hero-img img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
}

/* ==============================
   CONTENT LAYOUT
   ============================== */
.cs-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px var(--page-pad) 96px;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 56px;
}

/* Sidebar nav */
.cs-sidebar {
  position: sticky;
  top: 100px;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.cs-sidebar a {
  font: 400 13px/1.4 var(--sans);
  color: var(--muted);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: all 0.25s var(--ease-out);
  display: block;
}

.cs-sidebar a:hover {
  color: var(--fg);
  background: rgba(0, 0, 0, 0.02);
}

.cs-sidebar a.active {
  color: var(--fg);
  font-weight: 600;
  border-left-color: var(--accent);
  background: rgba(61, 90, 128, 0.04);
}

/* Content area */
.cs-content {
  min-width: 0;
}

/* ==============================
   CONTENT SECTIONS
   ============================== */
.cs-section {
  margin-bottom: 64px;
  scroll-margin-top: 100px;
}

.cs-section h2 {
  font: 600 clamp(22px, 2.5vw, 28px)/1.2 var(--display);
  letter-spacing: -0.01em;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--card-border);
}

.cs-section h3 {
  font: 600 18px/1.35 var(--sans);
  margin: 32px 0 12px;
}

.cs-section h4 {
  font: 600 15px/1.4 var(--sans);
  margin: 24px 0 10px;
}

.cs-section h5 {
  font: 600 14px/1.4 var(--sans);
  color: var(--accent);
  margin: 20px 0 8px;
}

.cs-section p {
  font: 400 15px/1.8 var(--sans);
  color: var(--text);
  margin-bottom: 16px;
  max-width: 680px;
}

.cs-section strong {
  font-weight: 600;
  color: var(--fg);
}

.cs-section ul, .cs-section ol {
  padding-left: 20px;
  margin-bottom: 16px;
}

.cs-section li {
  font: 400 14px/1.8 var(--sans);
  color: var(--text);
  margin-bottom: 10px;
  max-width: 660px;
}

.cs-section li strong {
  font-weight: 600;
  color: var(--fg);
}

/* ==============================
   IMAGES IN CONTENT
   ============================== */
.cs-image {
  margin: 28px 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--card-border);
}

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

.cs-image-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin: 28px 0;
}

.cs-image-row .cs-image {
  margin: 0;
}

/* Image carousel / gallery */
.cs-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin: 28px 0;
}

.cs-gallery .cs-image {
  margin: 0;
}

/* ==============================
   EXPANDABLE / DETAILS
   ============================== */
.cs-expandable {
  margin: 24px 0;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.cs-expandable summary {
  font: 600 14px/1.4 var(--sans);
  padding: 18px 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.2s;
  list-style: none;
}

.cs-expandable summary::-webkit-details-marker {
  display: none;
}

.cs-expandable summary::after {
  content: '▼';
  font-size: 10px;
  color: var(--muted);
  transition: transform 0.3s var(--ease-out);
}

.cs-expandable[open] summary::after {
  transform: rotate(180deg);
}

.cs-expandable summary:hover {
  background: rgba(0, 0, 0, 0.015);
}

.cs-expandable-body {
  padding: 0 24px 24px;
}

/* ==============================
   INSIGHTS / CALLOUT CARDS
   ============================== */
.cs-insight {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin: 20px 0;
}

.cs-insight p {
  margin-bottom: 0;
}

/* ==============================
   LIGHTBOX (simple CSS-only)
   ============================== */
.cs-lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.85);
  align-items: center;
  justify-content: center;
  padding: 40px;
  cursor: zoom-out;
  backdrop-filter: blur(8px);
}

.cs-lightbox.open {
  display: flex;
}

.cs-lightbox img {
  max-width: 90vw;
  max-height: 85vh;
  border-radius: var(--radius-sm);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.cs-lightbox-close {
  position: absolute;
  top: 24px;
  right: 32px;
  font: 400 28px/1 var(--sans);
  color: #fff;
  cursor: pointer;
  background: none;
  border: none;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.cs-lightbox-close:hover {
  opacity: 1;
}

/* ==============================
   RESPONSIVE
   ============================== */
@media (max-width: 900px) {
  .cs-hero-card {
    padding: 40px 32px 36px;
  }

  .cs-layout {
    grid-template-columns: 1fr;
    gap: 0;
    padding-top: 32px;
  }

  .cs-sidebar {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 4px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--card-border);
    margin-bottom: 32px;
  }

  .cs-sidebar a {
    border-left: none;
    border-bottom: 2px solid transparent;
    padding: 8px 14px;
    font-size: 12px;
    white-space: nowrap;
  }

  .cs-sidebar a.active {
    border-left: none;
    border-bottom-color: var(--accent);
  }
}

@media (max-width: 600px) {
  .cs-hero {
    padding-top: 80px;
  }

  .cs-hero-card {
    padding: 28px 20px;
  }

  .cs-meta-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .cs-hero-img {
    padding: 0 var(--page-pad);
  }

  .cs-sidebar {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 16px;
  }

  .cs-sidebar::-webkit-scrollbar {
    display: none;
  }

  .cs-section {
    margin-bottom: 48px;
  }
}

/* ==============================
   ANIMATIONS
   ============================== */
@keyframes heroReveal {
  from {
    opacity: 0;
    transform: translateY(32px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}