/* Case study page styles — extends ../styles.css */

/* ===== BREADCRUMB ===== */
.cs-breadcrumb {
  padding: calc(var(--nav-h) + 2rem) 2rem 0;
  max-width: 1100px;
  margin: 0 auto;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.cs-breadcrumb a { color: var(--accent); transition: opacity 0.2s; }
.cs-breadcrumb a:hover { opacity: 0.75; }
.cs-breadcrumb span { margin: 0 0.5rem; opacity: 0.4; }

/* ===== HERO ===== */
.cs-hero {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 2rem 0;
}

.cs-hero-content { padding: 2.5rem 0 2rem; }

.cs-hero-content .section-tag { margin-bottom: 1.25rem; }

.cs-hero-content h1 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(2.5rem, 5vw, 4rem);
  line-height: 1.12;
  margin-bottom: 1.1rem;
}

.cs-lead {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.8;
}

.cs-hero-img {
  width: 100%;
  height: 500px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

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

/* ===== META STRIP ===== */
.cs-meta {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-top: 3rem;
}

.cs-meta-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.75rem 2rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.cs-meta-item { display: flex; flex-direction: column; gap: 0.35rem; }

.cs-meta-label {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
}

.cs-meta-value {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
}

/* ===== SHARED SECTION WRAPPER ===== */
.cs-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4.5rem 2rem;
}

.cs-section h2 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  margin: 0.75rem 0 0;
  line-height: 1.25;
}

.cs-bg {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* ===== OVERVIEW ===== */
.cs-overview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
  margin-top: 2.5rem;
}

.cs-col p {
  color: var(--text-muted);
  line-height: 1.8;
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.cs-col h3 {
  font-family: 'Playfair Display', serif;
  font-size: 1.35rem;
  margin-bottom: 1rem;
}

.cs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  margin-top: 0.25rem;
}

.cs-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
}

.cs-num {
  min-width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(0, 161, 255, 0.1);
  color: var(--accent);
  font-size: 0.65rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ===== PROCESS ===== */
.cs-process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-top: 2.5rem;
}

.cs-process-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  position: relative;
  overflow: hidden;
  transition: border-color 0.25s, transform 0.25s;
}

.cs-process-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), #a855f7);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s ease;
}

.cs-process-card:hover { border-color: rgba(0, 161, 255, 0.3); transform: translateY(-3px); }
.cs-process-card:hover::before { transform: scaleX(1); }

.cs-step-num {
  font-family: 'Playfair Display', serif;
  font-size: 2.25rem;
  font-weight: 700;
  color: rgba(0, 161, 255);
  line-height: 1;
  margin-bottom: 0.85rem;
}

.cs-process-card h4 {
  font-size: 0.92rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
  color: var(--text);
}

.cs-process-card p {
  font-size: 0.81rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ===== SCREENS ===== */
.cs-screen-wrap {
  margin-top: 2.5rem;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

.cs-screen-wrap img {
  width: 100%;
  display: block;
  object-fit: cover;
  max-height: 540px;
}

.cs-screen-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: 2.5rem;
}

.cs-screen-body h3 {
  font-family: 'Playfair Display', serif;
  font-size: 1.45rem;
  margin-bottom: 0.85rem;
  line-height: 1.3;
}

.cs-screen-body p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.8;
  margin-bottom: 0.85rem;
}

/* ===== RESULTS ===== */
.cs-results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: 2.5rem;
}

.cs-result-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: border-color 0.25s, transform 0.25s;
}

.cs-result-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), #a855f7);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s ease;
}

.cs-result-card:hover { border-color: rgba(0, 161, 255, 0.3); transform: translateY(-4px); }
.cs-result-card:hover::after { transform: scaleX(1); }

.cs-result-num {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.cs-result-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.cs-result-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===== PAGE NAV ===== */
.cs-page-nav {
  border-top: 1px solid var(--border);
}

.cs-page-nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.cs-nav-link { display: flex; flex-direction: column; gap: 0.3rem; }
.cs-nav-link.right { text-align: right; }

.cs-nav-label {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
}

.cs-nav-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
  transition: color 0.2s;
}

.cs-nav-link:hover .cs-nav-title { color: var(--text); }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .cs-hero-img { height: 360px; }
  .cs-meta-inner { grid-template-columns: 1fr 1fr; }
  .cs-overview { grid-template-columns: 1fr; gap: 2.5rem; }
  .cs-process-grid { grid-template-columns: 1fr 1fr; }
  .cs-results-grid { grid-template-columns: 1fr 1fr; }
  .cs-screen-body { grid-template-columns: 1fr; gap: 1.5rem; }
}

@media (max-width: 600px) {
  .cs-hero-img { height: 240px; }
  .cs-meta-inner { grid-template-columns: 1fr 1fr; gap: 1.25rem; }
  .cs-process-grid { grid-template-columns: 1fr; }
  .cs-results-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .cs-process-card, .cs-result-card { transition: none; }
}