/* ==========================================================================
   Case Study Layout — cs-* components
   Used by project-4.html (and future case studies).

   Per-project accent color: set --cs-accent on <main>.
   e.g. <main style="--cs-accent: #0060AF;">

   All components respect body.theme--light via semantic tokens.
   ========================================================================== */

/* ================================================================
   CUSTOM PROPERTY DEFAULTS
   ================================================================ */
:root {
  --cs-accent:          #2563EB;         /* fallback — overridden per project */
  --cs-accent-dim:      rgba(37, 99, 235, 0.12);
  --cs-section-py:      var(--space-5xl);
  --cs-chapter-py:      var(--space-3xl);
  --cs-split-gap:       var(--space-5xl);
  --cs-split-col-text:  7fr;
  --cs-split-col-vis:   5fr;
}


/* ================================================================
   CS-INTRO — Overview + Meta 2-col block
   ================================================================ */
.cs-intro {
  padding: var(--cs-section-py) 0 var(--space-4xl);
  background-color: var(--color-bg);
  transition: background-color var(--duration-theme);
}

.cs-intro__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl) var(--space-4xl);
  align-items: start;
}

.cs-intro__overview-label {
  font-size: var(--text-caption);
  font-weight: var(--fw-emphasis);
  letter-spacing: var(--tracking-overline);
  text-transform: uppercase;
  color: var(--cs-accent);
  margin-bottom: var(--space-sm);
}

.cs-intro__text {
  font-size: var(--text-body-lg);
  line-height: var(--leading-prose);
  color: var(--color-text-secondary);
  max-width: 600px;
}

/* Right: stacked meta list */
.cs-intro__meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  padding-left: var(--space-2xl);
  border-left: 1px solid var(--color-border);
}

.cs-intro__meta-item {
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border-light);
}

.cs-intro__meta-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.cs-intro__meta-label {
  font-size: var(--text-caption);
  font-weight: var(--fw-emphasis);
  letter-spacing: var(--tracking-overline);
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  margin-bottom: 4px;
}

.cs-intro__meta-value {
  font-size: var(--text-label);
  line-height: 1.5;
  color: var(--color-text-primary);
  font-weight: var(--fw-emphasis);
}

@media (max-width: 1024px) {
  .cs-intro__inner {
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
  }

  .cs-intro__meta {
    padding-left: 0;
    border-left: none;
    padding-top: var(--space-2xl);
    border-top: 1px solid var(--color-border);
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-md);
  }

  .cs-intro__meta-item {
    flex: 1 1 calc(50% - var(--space-md));
    border-bottom: none;
    padding-bottom: 0;
  }
}

@media (max-width: 640px) {
  .cs-intro__meta-item {
    flex: 1 1 100%;
  }
}


/* ================================================================
   CS-STATEMENT — Large editorial pull statement
   ================================================================ */
.cs-statement {
  padding: var(--space-4xl) 0;
}

.cs-statement__text {
  font-family: 'Newsreader', Georgia, serif;
  font-style: italic;
  font-size: clamp(1.5rem, 2.5vw + 0.5rem, 2.5rem);
  line-height: 1.35;
  color: var(--color-text-primary);
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
  letter-spacing: -0.01em;
}

.cs-statement__text em {
  font-style: normal;
  color: var(--cs-accent);
}


/* ================================================================
   CS-FULL-BLEED — Image with caption
   ================================================================ */
.cs-full-bleed {
  margin: var(--space-4xl) 0;
}

.cs-full-bleed__frame {
  width: 100%;
  border-radius: var(--radius-card);
  overflow: hidden;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
}

.cs-full-bleed__frame img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 600px;
  object-fit: contain;
  object-position: center;
}

.cs-full-bleed__caption {
  margin-top: var(--space-sm);
  font-size: var(--text-caption);
  color: var(--color-text-tertiary);
  text-align: center;
  letter-spacing: var(--tracking-wide);
}


/* ================================================================
   CS-CHAPTER — Section divider with number + label
   ================================================================ */
.cs-chapter {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--cs-chapter-py) 0 var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.cs-chapter__number {
  font-size: var(--text-caption);
  font-weight: var(--fw-emphasis);
  letter-spacing: var(--tracking-overline);
  color: var(--cs-accent);
  font-variant-numeric: tabular-nums;
  min-width: 2rem;
}

.cs-chapter__label {
  font-size: var(--text-h4);
  font-weight: var(--fw-heading);
  color: var(--color-text-primary);
  letter-spacing: var(--tracking-heading);
  line-height: 1.2;
}


/* ================================================================
   CS-SPLIT — Two-column text + visual section
   ================================================================ */
.cs-split {
  padding: 0 0 var(--cs-section-py);
  background-color: var(--color-bg);
  transition: background-color var(--duration-theme);
}

/* Display grid is on the section; container has display:contents to
   let the children participate directly in this grid */
.cs-split {
  display: grid;
  grid-template-columns: var(--cs-split-col-text) var(--cs-split-col-vis);
  gap: 0 var(--space-4xl);
  align-items: start;
  padding-left: var(--grid-margin);
  padding-right: var(--grid-margin);
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
}

.cs-split--flip {
  grid-template-columns: var(--cs-split-col-vis) var(--cs-split-col-text);
}

/* Text column */
.cs-split__text {
  padding-top: var(--space-lg);
}

.cs-split__eyebrow {
  font-size: var(--text-caption);
  font-weight: var(--fw-emphasis);
  letter-spacing: var(--tracking-overline);
  text-transform: uppercase;
  color: var(--cs-accent);
  margin-bottom: var(--space-xs);
}

.cs-split__heading {
  font-size: var(--text-h3);
  font-weight: var(--fw-heading);
  color: var(--color-text-primary);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  margin-bottom: var(--space-lg);
}

.cs-split__body {
  font-size: var(--text-body);
  line-height: var(--leading-prose);
  color: var(--color-text-secondary);
}

.cs-split__body p {
  margin-bottom: var(--space-md);
}

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

.cs-split__body ul {
  margin-top: var(--space-md);
  margin-bottom: 0;
  padding-left: 1.25em;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.cs-split__body li {
  line-height: 1.6;
}

.cs-split__body li::marker {
  color: var(--cs-accent);
}

/* Visual column */
.cs-split__visual {
  padding-top: var(--space-lg);
  position: sticky;
  top: calc(var(--nav-height) + var(--space-lg));
}

.cs-split__image {
  width: 100%;
  min-height: 280px;
  border-radius: var(--radius-card);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  overflow: hidden;
  margin-bottom: var(--space-sm);
}

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

.cs-split__image-caption {
  font-size: var(--text-caption);
  color: var(--color-text-tertiary);
  line-height: 1.5;
  letter-spacing: var(--tracking-wide);
}

/* Flipped: visual moves to col 1 */
.cs-split--flip .cs-split__text {
  order: 2;
}

.cs-split--flip .cs-split__visual {
  order: 1;
}

@media (max-width: 1024px) {
  .cs-split,
  .cs-split--flip {
    display: flex;
    flex-direction: column;
    padding-left: var(--grid-margin);
    padding-right: var(--grid-margin);
    gap: var(--space-2xl);
  }

  .cs-split--flip .cs-split__text,
  .cs-split--flip .cs-split__visual {
    order: unset;
  }

  .cs-split__visual {
    position: static;
  }
}


/* ================================================================
   CS-PULL-QUOTE — Bold blockquote section
   ================================================================ */
.cs-pull-quote {
  padding: var(--space-4xl) 0;
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
  transition: background-color var(--duration-theme),
              border-color var(--duration-theme);
}

.cs-pull-quote__text {
  font-family: 'Newsreader', Georgia, serif;
  font-style: italic;
  font-size: clamp(1.25rem, 1.5vw + 0.5rem, 1.75rem);
  line-height: 1.45;
  color: var(--color-text-primary);
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
  padding-left: var(--space-2xl);
  padding-right: var(--space-2xl);
  position: relative;
}

.cs-pull-quote__text::before {
  content: '"';
  display: block;
  font-family: 'Newsreader', Georgia, serif;
  font-style: italic;
  font-size: 4rem;
  line-height: 1;
  color: var(--cs-accent);
  opacity: 0.4;
  margin-bottom: -1rem;
}

.cs-pull-quote__text strong {
  font-style: normal;
  font-weight: var(--fw-heading);
  color: var(--color-text-primary);
}


/* ================================================================
   CS-STATS — Impact metrics grid
   ================================================================ */
.cs-stats {
  padding: var(--cs-section-py) 0;
  background-color: var(--color-bg);
  transition: background-color var(--duration-theme);
}

.cs-stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.cs-stat {
  padding: var(--space-xl) var(--space-lg);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-card);
  text-align: center;
  transition: background-color var(--duration-theme),
              border-color var(--duration-theme);
}

.cs-stat__number {
  font-size: clamp(2.5rem, 4vw + 0.5rem, 4rem);
  font-weight: var(--fw-black);
  line-height: 1;
  color: var(--cs-accent);
  letter-spacing: var(--tracking-heading);
  margin-bottom: var(--space-xs);
  font-variant-numeric: tabular-nums;
}

.cs-stat__label {
  font-size: var(--text-caption);
  line-height: 1.5;
  color: var(--color-text-secondary);
  max-width: 200px;
  margin: 0 auto;
}

@media (max-width: 1024px) {
  .cs-stats__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .cs-stats__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
  }

  .cs-stat {
    padding: var(--space-lg) var(--space-md);
  }
}


/* ================================================================
   THEME — Light mode overrides
   All semantic-token-based components update automatically.
   These are for cs-specific elements that need explicit overrides.
   ================================================================ */
body.theme--light .cs-stat {
  background-color: var(--p-neutral-50);
  border-color: var(--p-neutral-150);
}

body.theme--light .cs-full-bleed__frame {
  background-color: var(--p-neutral-100);
  border-color: var(--p-neutral-200);
}

body.theme--light .cs-split__image {
  background-color: var(--p-neutral-100);
  border-color: var(--p-neutral-200);
}