/**
 * Case Studies – Index and Article Styles
 * Uses design tokens from shared-styles.css; supports light/dark theme.
 */

/* ==========================================================================
   Index: Hero
   ========================================================================== */

.case-studies-hero {
  padding: clamp(4rem, 10vw, 6rem) 1.5rem clamp(3rem, 6vw, 4rem);
  background: var(--bg-gradient);
  position: relative;
  overflow: hidden;
}

.case-studies-hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 70%;
  height: 140%;
  background: radial-gradient(ellipse, rgba(53, 111, 246, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.dark-theme .case-studies-hero::before,
html:not(.light-theme) .case-studies-hero::before {
  background: radial-gradient(ellipse, rgba(96, 165, 250, 0.12) 0%, transparent 70%);
}

.case-studies-hero__container {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.case-studies-hero__eyebrow {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-primary-blue);
  margin-bottom: 0.75rem;
}

.case-studies-hero__title {
  font-family: var(--font-primary);
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin: 0 0 1rem;
  max-width: 20ch;
}

.case-studies-hero__subtitle {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  line-height: 1.5;
  color: var(--text-secondary);
  margin: 0;
  max-width: 42rem;
}

/* ==========================================================================
   Index: Card Grid
   ========================================================================== */

.case-studies-section {
  padding: clamp(3rem, 6vw, 4.5rem) 1.5rem;
}

.case-studies-section__inner {
  max-width: 1200px;
  margin: 0 auto;
}

.case-studies-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.case-study-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.case-study-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary-blue), var(--color-accent-cyan));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.case-study-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary-blue-light);
}

.case-study-card:hover::after {
  opacity: 1;
}

.case-study-card__tag {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-primary-blue);
  margin-bottom: 0.75rem;
}

.case-study-card__title {
  font-family: var(--font-primary);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
  margin: 0 0 0.5rem;
}

.case-study-card__one-liner {
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--text-secondary);
  margin: 0 0 1rem;
}

.case-study-card__stat {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary-blue);
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.case-study-card__link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary-blue);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: auto;
}

.case-study-card__link svg {
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.case-study-card:hover .case-study-card__link svg {
  transform: translateX(3px);
}

/* ==========================================================================
   Article: Layout
   ========================================================================== */

.case-article {
  padding-bottom: clamp(3rem, 6vw, 5rem);
}

.case-article__hero {
  padding: clamp(4rem, 10vw, 6rem) 1.5rem clamp(2.5rem, 5vw, 3.5rem);
  background: var(--bg-gradient);
  position: relative;
  overflow: hidden;
}

.case-article__hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -10%;
  width: 50%;
  height: 120%;
  background: radial-gradient(ellipse, rgba(53, 111, 246, 0.07) 0%, transparent 65%);
  pointer-events: none;
}

.dark-theme .case-article__hero::before {
  background: radial-gradient(ellipse, rgba(96, 165, 250, 0.1) 0%, transparent 65%);
}

.case-article__container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

.case-article__breadcrumb {
  font-size: var(--text-sm);
  margin-bottom: 1rem;
}

.case-article__breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
}

.case-article__breadcrumb a:hover {
  color: var(--color-primary-blue);
}

.case-article__breadcrumb span {
  color: var(--text-muted);
  margin: 0 0.35rem;
}

.case-article__title {
  font-family: var(--font-primary);
  font-size: clamp(1.875rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin: 0 0 0.75rem;
}

.case-article__one-liner {
  font-size: clamp(1.0625rem, 2vw, 1.1875rem);
  line-height: 1.55;
  color: var(--text-secondary);
  margin: 0;
}

/* ==========================================================================
   Article: Stats Row
   ========================================================================== */

.case-article__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin: 2.5rem 0 2rem;
  padding: 0 1.5rem;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.case-stat {
  text-align: center;
  padding: 1.25rem 1rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.case-stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-primary-blue);
  letter-spacing: -0.02em;
  display: block;
  margin-bottom: 0.25rem;
}

.case-stat__label {
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

/* ==========================================================================
   Article: Sections
   ========================================================================== */

.case-article__body {
  padding: 0 1.5rem;
  max-width: 720px;
  margin: 0 auto;
}

.case-article__section {
  margin-bottom: 2.5rem;
}

.case-article__section h2 {
  font-family: var(--font-primary);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 0.75rem;
}

.case-article__section p {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin: 0 0 1rem;
}

.case-article__section p:last-child {
  margin-bottom: 0;
}

.case-article__section ul {
  margin: 0 0 1rem;
  padding-left: 1.5rem;
}

.case-article__section li {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
}

/* ==========================================================================
   Article: Quote Block
   ========================================================================== */

.case-quote {
  margin: 2.5rem 0;
  padding: 1.75rem 1.5rem;
  background: var(--bg-secondary);
  border-left: 4px solid var(--color-primary-blue);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.case-quote__text {
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--text-primary);
  font-style: italic;
  margin: 0 0 0.75rem;
}

.case-quote__attribution {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

/* ==========================================================================
   Article: Meta + CTA
   ========================================================================== */

.case-article__meta {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.case-article__cta {
  margin-top: 2.5rem;
  padding: 2rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  text-align: center;
}

.case-article__cta p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin: 0 0 1rem;
}

.case-article__cta .cro-btn,
.case-article__cta a.cro-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  background: var(--color-primary-blue);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: background-color var(--transition-fast);
}

.case-article__cta .cro-btn:hover,
.case-article__cta a.cro-btn:hover {
  background: var(--color-primary-blue-dark);
  color: #fff;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 809px) {
  .case-studies-grid {
    grid-template-columns: 1fr;
  }

  .case-article__stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .case-article__stats {
    grid-template-columns: 1fr;
  }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}