/* ======================================================
   CASE STUDY PAGE — case-study.css
   Supplements styles.css. Import both on every case study page.
   ====================================================== */

/* ── Page-level reset ─────────────────────────────────── */
.cs-hero,
.cs-body {
  padding-top: var(--nav-height);
}

/* ── HERO HEADER ─────────────────────────────────────── */
.cs-hero {
  background-color: transparent;
  border-bottom: 1px solid var(--border);
  transition: border-color 0.3s ease;
}

.cs-hero__inner {
  padding-block: 4rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* Breadcrumb */
.cs-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}
.cs-breadcrumb a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: opacity 0.15s ease;
}
.cs-breadcrumb a:hover { opacity: 0.75; }
.cs-breadcrumb span { color: var(--text-muted); }

/* Category tag */
.cs-tag {
  display: inline-flex;
  align-items: center;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(108, 92, 231, 0.2);
  margin-bottom: 0.75rem;
}
[data-theme="dark"] .cs-tag { border-color: rgba(138, 124, 255, 0.25); }

/* Hero title */
.cs-hero__title {
  font-size: clamp(1.875rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 1.125rem;
}

/* Hero intro */
.cs-hero__intro {
  font-size: clamp(1rem, 1.5vw, 1.1875rem);
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 680px;
}

/* Meta strip */
.cs-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 3rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border);
}
.cs-meta__label {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}
.cs-meta__value {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
}
.cs-meta__value--accent {
  color: var(--accent);
  font-size: 1rem;
  font-weight: 800;
}

/* ── BODY LAYOUT (sidebar + article) ─────────────────── */
.cs-body {
  padding-top: 0;
  min-height: 60vh;
  background-color: transparent;
  transition: background-color 0.3s ease;
}

.cs-body__inner {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 4rem;
  padding-block: 4rem;
  align-items: start;
}

/* ── Sidebar TOC ──────────────────────────────────────── */
.cs-toc {
  position: sticky;
  top: calc(var(--nav-height) + 2rem);
  align-self: start;
}

.cs-toc__heading {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.875rem;
}

.cs-toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.cs-toc a {
  font-size: 0.8125rem;
  color: var(--text-muted);
  text-decoration: none;
  display: block;
  padding: 0.35rem 0.625rem;
  border-radius: 6px;
  border-left: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.cs-toc a:hover,
.cs-toc a.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-soft);
}

/* ── Article ──────────────────────────────────────────── */
.cs-article {
  min-width: 0; /* prevent grid overflow */
}

/* ── Section ──────────────────────────────────────────── */
.cs-section {
  padding-bottom: 3rem;
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--border);
}
.cs-section--no-border {
  border-bottom: none;
  padding-bottom: 1rem;
  margin-bottom: 1rem;
}
.cs-section--last {
  border-bottom: none;
  margin-bottom: 0;
}

.cs-section__title {
  font-size: clamp(1.1875rem, 2vw, 1.5rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.125rem;
  letter-spacing: -0.02em;
}

.cs-section p {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}
.cs-section p:last-child { margin-bottom: 0; }

/* ── Callout boxes ────────────────────────────────────── */
.cs-callout {
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
}
.cs-callout p {
  font-size: 0.9375rem;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.65;
}
.cs-callout--insight {
  border-left-color: #a29bfe;
  background: rgba(162, 155, 254, 0.08);
}
[data-theme="dark"] .cs-callout { background: rgba(108, 92, 231, 0.12); }
[data-theme="dark"] .cs-callout--insight { background: rgba(162, 155, 254, 0.1); }

/* ── Lists ────────────────────────────────────────────── */
.cs-list {
  padding-left: 1.25rem;
  margin: 1rem 0 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}
.cs-list li {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-secondary);
}
.cs-list--numbered { list-style: decimal; }

/* ── Impact metrics grid (Top level scannable) ───────── */
.cs-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin: 2rem 0;
}

.cs-metric {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.75rem 1.5rem;
  text-align: left; /* standard PM style: left align or center */
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.cs-metric:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
  border-color: var(--accent);
}

.cs-metric__num {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 0.5rem;
  display: block;
}

.cs-metric__label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 600;
  line-height: 1.4;
}

/* ── Role & Ownership Block ──────────────────────────── */
.cs-role-block {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  margin: 3rem 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2.5rem;
}

.cs-role-item__label {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.cs-role-item__value {
  font-size: 0.9375rem;
  color: var(--text-primary);
  font-weight: 600;
}

.cs-role-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.cs-role-list li {
  font-size: 0.875rem;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  color: var(--text-secondary);
}

.cs-role-list li::before {
  content: "•";
  color: var(--accent);
  font-weight: bold;
}

/* ── Framework Grid ─────────────────────────────────── */
.cs-framework-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.cs-framework-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.cs-framework-card:hover {
  border-color: var(--accent);
  background: var(--bg-secondary);
}

.cs-framework-card__name {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.cs-framework-card__desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── Section Dividers ───────────────────────────────── */
.cs-divider {
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border), transparent);
  margin: 4rem 0;
  border: none;
}

/* ── Figure / image ───────────────────────────────────── */
.cs-figure {
  margin: 1.75rem 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--border);
}
.cs-figure img {
  width: 100%;
  height: auto;
  display: block;
}
.cs-figure figcaption {
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 0.625rem 1rem;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
}

/* ── Bottom nav bar ───────────────────────────────────── */
.cs-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 3rem;
  margin-top: 3rem;
  border-top: 1px solid var(--border);
}

.cs-nav-bar__back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s ease;
}
.cs-nav-bar__back:hover { color: var(--accent); }
.cs-nav-bar__back svg { stroke: currentColor; }

/* ── RESPONSIVE ───────────────────────────────────────── */
@media (max-width: 1024px) {
  .cs-body__inner {
    grid-template-columns: 180px 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 768px) {
  .cs-hero__inner  { padding-block: 2.5rem 2rem; gap: 1.25rem; }
  .cs-hero__title  { font-size: 1.75rem; }

  .cs-body__inner {
    grid-template-columns: 1fr;
    padding-block: 2.5rem;
    gap: 0;
  }

  /* TOC: horizontal scrollable pills on mobile */
  .cs-toc {
    position: static;
    overflow-x: auto;
    margin-bottom: 2rem;
    padding-bottom: 0.5rem;
  }
  .cs-toc ul {
    flex-direction: row;
    gap: 0.375rem;
    flex-wrap: nowrap;
    white-space: nowrap;
  }
  .cs-toc a {
    border-left: none;
    border-bottom: 2px solid transparent;
    border-radius: 20px;
    padding: 0.3rem 0.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
  }
  .cs-toc a:hover,
  .cs-toc a.active {
    border-color: var(--accent);
    background: var(--accent-soft);
  }

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

  .cs-nav-bar { flex-direction: column; align-items: flex-start; }
  .cs-nav-bar .btn { width: 100%; justify-content: center; }
}

@media (max-width: 480px) {
  .cs-metrics { grid-template-columns: 1fr; }
  .cs-meta    { gap: 1rem; }
}