/* ============================================================
   CASE STUDY PAGE STYLES
   Extends style.css — import after main stylesheet
   ============================================================ */

/* ============================================================
   CASE STUDY HERO
   ============================================================ */
.cs-hero {
  padding: calc(var(--nav-height) + 64px) 0 80px;
  position: relative;
  overflow: hidden;
  background: var(--bg-primary);
}

.cs-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black 20%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black 20%, transparent 100%);
  pointer-events: none;
}

[data-theme="light"] .cs-hero::before {
  background:
    linear-gradient(rgba(0,0,0,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

.cs-hero__orb {
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(99,102,241,0.2) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(80px);
  top: -150px;
  right: -100px;
  pointer-events: none;
}

.cs-hero__content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.cs-hero__back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 32px;
  transition: color 0.2s;
}
.cs-hero__back:hover { color: var(--accent); }
.cs-hero__back svg { width: 14px; height: 14px; }

.cs-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.cs-hero__title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4.5vw, 56px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.cs-hero__subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 680px;
  margin-bottom: 40px;
}

.cs-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  padding: 24px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.cs-meta-item__label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.cs-meta-item__value {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

/* ============================================================
   CASE STUDY LAYOUT — Sticky sidebar + content
   ============================================================ */
.cs-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 64px;
  align-items: start;
  padding: 64px 0 96px;
}

.cs-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + 24px);
}

.cs-sidebar__title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.cs-sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.cs-sidebar__link {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: all 0.2s;
  display: block;
}

.cs-sidebar__link:hover {
  color: var(--text-primary);
  background: var(--bg-glass-light);
}

.cs-sidebar__link.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.06);
}

/* ============================================================
   CASE STUDY SECTIONS
   ============================================================ */
.cs-section {
  margin-bottom: 80px;
  scroll-margin-top: calc(var(--nav-height) + 32px);
}

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

.cs-section__tag {
  display: inline-flex;
  align-items: center;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 12px;
}

.cs-section__title {
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.cs-section__text {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
}

.cs-section__text strong { color: var(--text-primary); font-weight: 600; }

/* ============================================================
   IMPACT METRICS STRIP
   ============================================================ */
.cs-metrics-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  margin: 40px 0;
  background: var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--border);
}

.cs-metrics-strip__item {
  background: var(--bg-card);
  padding: 28px 24px;
  text-align: center;
}

.cs-metrics-strip__value {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
  line-height: 1;
}

.cs-metrics-strip__label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ============================================================
   PROCESS STEPS
   ============================================================ */
.cs-process {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin: 32px 0;
}

.cs-step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: relative;
  transition: all 0.25s;
}

.cs-step:hover {
  border-color: var(--border-accent);
  transform: translateY(-2px);
}

.cs-step__num {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
  letter-spacing: 0.08em;
}

.cs-step__icon { font-size: 24px; margin-bottom: 8px; }

.cs-step__title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.cs-step__desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ============================================================
   WIREFRAME / IMAGE PLACEHOLDER
   ============================================================ */
.cs-image {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  margin: 32px 0;
}

.cs-image__placeholder {
  padding: 60px 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 16px;
  background: var(--gradient-glow);
  min-height: 300px;
  text-align: center;
}

.cs-image__placeholder-icon { font-size: 48px; }

.cs-image__placeholder-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
  max-width: 300px;
  line-height: 1.6;
}

.cs-image__caption {
  padding: 14px 20px;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  font-style: italic;
}

/* ============================================================
   BEFORE / AFTER COMPARISON
   ============================================================ */
.cs-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 32px 0;
}

.cs-comparison__panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.cs-comparison__header {
  padding: 12px 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}

.cs-comparison__label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.cs-comparison__label--before { color: var(--error); }
.cs-comparison__label--after  { color: var(--success); }

.cs-comparison__body {
  padding: 24px;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cs-comparison__issue {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.cs-comparison__issue::before {
  flex-shrink: 0;
  margin-top: 2px;
  font-size: 14px;
}

.cs-comparison__panel--before .cs-comparison__issue::before { content: '✗'; color: var(--error); }
.cs-comparison__panel--after  .cs-comparison__issue::before { content: '✓'; color: var(--success); }

/* ============================================================
   RESEARCH INSIGHTS
   ============================================================ */
.cs-insights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 32px 0;
}

.cs-insight-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: all 0.25s;
}

.cs-insight-card:hover {
  border-color: var(--border-accent);
}

.cs-insight-card__icon { font-size: 24px; margin-bottom: 12px; }

.cs-insight-card__title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.cs-insight-card__desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================================
   QUOTE HIGHLIGHT
   ============================================================ */
.cs-quote {
  background: rgba(var(--accent-rgb), 0.06);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 20px 24px;
  margin: 32px 0;
}

.cs-quote__text {
  font-size: 16px;
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 8px;
}

.cs-quote__author {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
}

/* ============================================================
   NEXT CASE STUDY LINK
   ============================================================ */
.cs-next {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 40px 48px;
  text-align: center;
  transition: all 0.3s var(--ease-smooth);
  margin-top: 64px;
  position: relative;
  overflow: hidden;
}

.cs-next::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.04) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.3s;
}

.cs-next:hover::before { opacity: 1; }

.cs-next:hover {
  border-color: var(--border-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow), 0 20px 40px rgba(0,0,0,0.2);
}

.cs-next__label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.cs-next__title {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 24px;
  line-height: 1.25;
}

.cs-next__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 28px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius-full);
  transition: gap 0.2s, background 0.2s, box-shadow 0.2s, transform 0.2s;
  text-decoration: none;
}

.cs-next:hover .cs-next__link {
  gap: 16px;
  background: var(--accent-hover, #2563EB);
  box-shadow: 0 6px 20px rgba(var(--accent-rgb), 0.4);
  transform: translateY(-1px);
}

/* ============================================================
   RESPONSIVE — TABLET
   ============================================================ */
@media (max-width: 1024px) {
  .cs-layout {
    grid-template-columns: 1fr;
  }
  .cs-sidebar {
    display: none;
  }
  .cs-metrics-strip {
    grid-template-columns: repeat(2, 1fr);
  }
  .cs-comparison {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .cs-metrics-strip {
    grid-template-columns: 1fr 1fr;
  }
  .cs-insights {
    grid-template-columns: 1fr;
  }
  .cs-hero__meta {
    gap: 20px;
  }
  .cs-process {
    grid-template-columns: 1fr 1fr;
  }
}