/* ================================
   CASE-STUDY.CSS
   Styles specific to case study
   pages only.
================================ */

/* ── Hero ── */
.cs-hero {
  padding: 72px 0 0px;
}

.cs-title {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 700;
  letter-spacing: -2px;
  line-height: 1.0;
  margin-bottom: 16px;
  margin-top: 16px;
}

.cs-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-2);
  margin-bottom: 24px;
  max-width: 560px;
}

.cs-meta {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
  padding: 24px 0 0;
  margin-top: 24px;
  margin-bottom: 24px;
}

.cs-meta-label {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-3);
  margin-bottom: 6px;
}

.cs-meta-value {
  font-size: 14px;
  font-weight: 400;
  color: var(--color-text-2);
}

/* ── Cover image ── */
.cs-cover {
  width: 100%;
  height: 520px;
  background: var(--color-accent);
  border-radius: var(--radius-xl);
  margin: 40px 0 48px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.cs-cover-placeholder {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.4);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ── Sections ── */
.cs-section {
  padding: 64px 0;
}

.cs-section-title {
  font-size: clamp(24px, 3vw, 40px);
  font-weight: 700;
  letter-spacing: -1px;
  line-height: 1.1;
  max-width: 720px;
  margin-bottom: 24px;
  margin-top: 12px;
}

.cs-section-intro {
  font-size: var(--text-lg);
  color: var(--color-text-2);
  max-width: 600px;
  margin-bottom: 40px;
}

.cs-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 680px;
  color: var(--color-text-2);
  font-size: var(--text-base);
}

/* ── Goals and constraints ── */
.cs-goals {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-top: 48px;
  padding-top: 40px;
  border-top: 0.5px solid var(--color-border);
}

.cs-goals-label {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #2d9e6b;
  margin-bottom: 20px;
  font-weight: 700;
}

.cs-goals-label--constraints {
  color: var(--color-accent);
}

.cs-goals-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.cs-goals-list li {
  font-size: var(--text-base);
  color: var(--color-text-2);
  padding-left: 20px;
  position: relative;
  line-height: 1.6;
}

.cs-goals-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: #2d9e6b;
  font-size: 12px;
}

.cs-goals-list--constraints li::before {
  color: var(--color-accent);
}

/* ── Accordion ── */
.cs-accordion {
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--color-border);
  border: 0.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.cs-accordion-item {
  background: var(--color-bg);
  transition: background 0.3s;
}

.cs-accordion-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-body);
  color: var(--color-text-1);
  transition: background 0.15s;
}

.cs-accordion-btn:hover {
  background: var(--color-bg-2);
}

.cs-accordion-num {
  font-size: var(--text-xs);
  color: var(--color-text-3);
  min-width: 20px;
}

.cs-accordion-title {
  font-size: var(--text-base);
  font-weight: 700;
  flex: 1;
}

.cs-accordion-arrow {
  font-size: 16px;
  color: var(--color-text-3);
  transition: transform 0.3s ease;
}

.cs-accordion-btn.open .cs-accordion-arrow {
  transform: rotate(180deg);
}

.cs-accordion-body {
  display: none;
  padding: 0 24px 24px 60px;
  color: var(--color-text-2);
  font-size: var(--text-base);
  line-height: 1.75;
}

.cs-accordion-body p + p {
  margin-top: 12px;
}

.cs-accordion-body.open {
  display: block;
}

/* ── Image placeholders ── */
.cs-image-placeholder {
  width: 100%;
  height: 360px;
  background: var(--color-bg-2);
  border-radius: var(--radius-xl);
  border: 1px dashed var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  color: var(--color-text-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 40px;
}

.cs-preview-placeholder {
  width: 100%;
  height: 480px;
  background: var(--color-bg-2);
  border-radius: var(--radius-xl);
  border: 1px dashed var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  color: var(--color-text-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 40px;
}

/* ── Footer nav ── */
.cs-footer-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 48px 0 24px;
}

.cs-footer-back,
.cs-footer-next {
  font-size: var(--text-sm);
  color: var(--color-text-2);
  text-decoration: none;
  font-weight: 700;
  transition: color 0.2s;
}

.cs-footer-back:hover,
.cs-footer-next:hover {
  color: var(--color-text-1);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .cs-hero { padding: 48px 0 32px; }
  .cs-meta { gap: 24px; }
  .cs-cover { height: 280px; }
  .cs-section { padding: 48px 0; }
  .cs-goals { grid-template-columns: 1fr; gap: 32px; }
  .cs-accordion-body { padding-left: 24px; }
  .cs-footer-nav { flex-direction: column; gap: 16px; align-items: flex-start; }
}


.cs-cover-caption {
  font-size: 12px;
  color: var(--color-text-3);
  text-align: center;
  margin-top: 16px;
  letter-spacing: 0.04em;
}
/* ── Hero image ── */
.cs-hero-img {
  width: 100%;
  margin: 0 auto;
  border-radius: 12px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 0.5px solid var(--color-border);
  box-shadow: 0 24px 60px rgba(0,0,0,0.08);
  transition: border-color 0.3s;
}

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

.page--case-study {
  max-width: 1280px;
  padding: 0 var(--gutter) 80px;
}

/* ================================
   TABLE OF CONTENTS
================================ */
.content-wrap {
  display: grid;
  grid-template-columns: 200px minmax(0, 820px);
  gap: clamp(40px, 5vw, 80px);
  justify-content: center;
  padding-top: 72px;
  align-items: start;
}

.toc {
  position: sticky;
  top: 80px;
}

.toc-inner {
  /* inner wrapper kept for backwards compat */
}

.main-content {
  min-width: 0;   /* allow grid item to shrink below its content width */
  max-width: 820px;
}

.main-content > * {
  max-width: 100%;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toc-item a {
  display: block;
  font-size: 16px;
  font-weight: 400;
  color: var(--color-text-3);
  text-decoration: none;
  padding: 4px 0;
  transition: color 0.2s;
  line-height: 1.4;
}

.toc-item a:hover { color: var(--color-text-2); }

.toc-item.active a {
  color: var(--color-text-1);
  font-weight: 700;
}

/* ── Responsive — collapse to single column when narrow ── */
@media (max-width: 960px) {
  .content-wrap {
    grid-template-columns: 1fr;
  }
  .toc { display: none; }
}

/* ================================
   PULL QUOTES
================================ */
.cs-quote {
  max-width: 680px;
  margin: 40px 0;
  padding: 32px 0 32px 32px;
  border-left: 2px solid var(--color-accent);
}
.cs-quote p {
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: -0.5px;
  color: var(--color-text-1);
  margin-bottom: 16px;
}
.cs-quote cite {
  font-size: var(--text-sm);
  font-style: normal;
  color: var(--color-text-3);
  letter-spacing: 0.02em;
}
@media (max-width: 768px) {
  .cs-quote { padding: 24px 0 24px 20px; margin: 32px 0; }
}

/* ================================
   LISTS INSIDE CS-BODY
================================ */
.cs-body ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 0;
}
.cs-body ul li {
  padding-left: 20px;
  position: relative;
  line-height: 1.6;
}
.cs-body ul li::before {
  content: '–';
  position: absolute;
  left: 0;
  color: var(--color-text-3);
}

/* ================================
   HORIZONTAL SCROLL STRIP
================================ */
.cs-strip {
  margin: 40px 0 8px;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 16px;
}
.cs-strip-track {
  display: flex;
  gap: 16px;
  padding: 0;
  width: max-content;
}
.cs-strip-item {
  flex: 0 0 auto;
  width: 420px;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.cs-strip-img {
  width: 100%;
  height: 280px;
  background: var(--color-bg-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}
.cs-strip-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}
.cs-strip-item figcaption {
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--color-text-2);
  font-size: var(--text-sm);
  line-height: 1.6;
}
.cs-strip-label {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-3);
  font-weight: 700;
}
.cs-strip::-webkit-scrollbar { height: 4px; }
.cs-strip::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 2px; }
.cs-strip::-webkit-scrollbar-track { background: transparent; }
@media (max-width: 768px) {
  .cs-strip { margin: 32px 0 8px; }
  .cs-strip-track { padding: 0; }
  .cs-strip-item { width: 280px; }
}