/* ==========================================================================
   CASE STUDY PAGE — extends the main site's design system (styles.css)
   ========================================================================== */

.logo-text { color: var(--text-primary); }

/* ---------- Case hero ---------- */
.cs-hero { padding: 64px 0 70px; }

.cs-hero-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 56px;
  align-items: center;
}

.cs-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 88px;
  height: 88px;
  background: var(--text-primary);
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.6rem;
  border-radius: var(--radius-lg);
  margin-bottom: 28px;
}

.cs-name {
  font-family: var(--font-heading);
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.cs-tagline {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 20px;
  max-width: 46ch;
}

.cs-scope {
  color: var(--text-muted);
  font-size: 0.98rem;
  margin-bottom: 28px;
}

.cs-byline { font-size: 0.95rem; color: var(--text-secondary); }
.cs-byline strong { color: var(--text-primary); }

.cs-hero-visual img {
  width: 100%;
  border-radius: var(--radius-lg);
  display: block;
}

/* ---------- Section shells ---------- */
.cs-section { padding: 88px 0; }
.cs-section-alt { background: var(--bg-white); border-top: 1px solid var(--border-light); border-bottom: 1px solid var(--border-light); }

.cs-subhead { font-family: var(--font-heading); font-size: 1.15rem; font-weight: 700; margin-bottom: 18px; }

/* ---------- Overview ---------- */
.cs-callout-box {
  background: var(--cobalt-bg);
  border: 1.5px solid var(--border-blue);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 40px;
}
.cs-callout-box strong { display: block; font-size: 1.15rem; margin-bottom: 4px; }
.cs-callout-box span { color: var(--cobalt-primary); font-weight: 600; }

.cs-glance-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.cs-glance-card {
  background: var(--bg-white);
  border: 1.5px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 22px;
}
.cs-glance-label {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cobalt-primary);
  margin-bottom: 8px;
}
.cs-glance-card p { font-size: 0.92rem; color: var(--text-secondary); line-height: 1.5; }

/* ---------- Challenge ---------- */
.cs-challenge-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.cs-point-list li { margin-bottom: 22px; }
.cs-point-list li:last-child { margin-bottom: 0; }
.cs-point-list strong { display: block; font-size: 1.05rem; font-weight: 700; margin-bottom: 4px; }
.cs-point-list span { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.55; }

.cs-figure img {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border-dark);
  display: block;
}
.cs-figure figcaption {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-top: 14px;
}
.cs-figure-wide { max-width: 100%; }

/* ---------- Approach ---------- */
.cs-approach-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}
.cs-audience-col { display: flex; flex-direction: column; gap: 20px; }

.cs-principle-list li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-light);
}
.cs-principle-list li:last-child { border-bottom: none; }
.cs-principle-list strong { font-size: 0.98rem; font-weight: 700; }
.cs-principle-list span { color: var(--text-secondary); font-size: 0.9rem; }

.cs-note-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--emerald-bg);
  color: var(--emerald-accent);
  border: 1px solid rgba(5, 150, 105, 0.25);
  padding: 10px 18px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.9rem;
}

/* ---------- Platform surfaces ---------- */
.cs-surface-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 36px;
}
.cs-surface-sub {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--cobalt-primary);
  margin-top: 4px;
}
.cs-surface-list li { padding: 12px 0; border-top: 1px solid var(--border-light); }
.cs-surface-list li:first-child { border-top: none; padding-top: 20px; }
.cs-surface-list strong { display: block; font-size: 0.95rem; font-weight: 700; }
.cs-surface-list span { font-size: 0.85rem; color: var(--text-muted); }

/* ---------- Feature deep-dives ---------- */
.cs-feature-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
  align-items: center;
}
.cs-feature-grid-reverse { grid-template-columns: 1.15fr 0.85fr; }
.cs-feature-grid-reverse > img { order: -1; }

.cs-feature-img {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border-dark);
  box-shadow: 6px 6px 0px var(--border-dark);
}

.cs-callout-list { counter-reset: cs-callout; }
.cs-callout-list li {
  counter-increment: cs-callout;
  position: relative;
  padding-left: 44px;
  margin-bottom: 22px;
}
.cs-callout-list li:last-child { margin-bottom: 0; }
.cs-callout-list li::before {
  content: counter(cs-callout);
  position: absolute;
  left: 0;
  top: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--cobalt-primary);
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cs-callout-list strong { display: block; font-size: 1.02rem; font-weight: 700; margin-bottom: 3px; }
.cs-callout-list span { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.5; }

.cs-twocol-desc {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-top: 28px;
}
.cs-twocol-desc h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.cs-twocol-desc p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.55; }

/* ---------- Outcome ---------- */
.cs-caveat { color: var(--text-muted); font-size: 0.85rem; font-style: italic; }

/* ---------- Dark feature section (e.g. gamified moments) ---------- */
.cs-section-dark { background: var(--text-primary); }
.cs-section-dark .step-badge { background: rgba(255,255,255,0.12); color: #fff; }
.cs-badge-pink { background: #D6409F !important; color: #fff !important; }

/* ---------- Persona card ---------- */
.cs-persona-card {
  background: var(--bg-white);
  border: 1.5px solid var(--border-dark);
  border-radius: var(--radius-lg);
  padding: 36px;
}
.cs-persona-head { display: flex; align-items: center; gap: 16px; margin-bottom: 18px; }
.cs-persona-avatar {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--cobalt-primary);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-heading); font-weight: 700; font-size: 1.05rem;
  flex-shrink: 0;
}
.cs-persona-name { font-size: 1.15rem; font-weight: 800; }
.cs-persona-role { font-size: 0.88rem; color: var(--text-muted); }
.cs-persona-desc { color: var(--text-secondary); font-size: 0.98rem; line-height: 1.6; }

.cs-quote {
  margin-top: 22px;
  padding: 20px 24px;
  background: var(--cobalt-bg);
  border-left: 3px solid var(--cobalt-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--text-primary);
  font-size: 1rem;
  line-height: 1.6;
}

/* ---------- 5 Why chain ---------- */
.cs-why-chain {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 24px;
  background: var(--bg-white);
  border: 1.5px solid var(--border-dark);
  border-radius: var(--radius-md);
}
.cs-why-chain span {
  font-size: 0.88rem;
  font-weight: 700;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg-canvas);
}
.cs-why-chain .cs-why-plus { background: none; font-weight: 800; padding: 0 2px; }
.cs-why-chain .cs-why-arrow { background: none; color: var(--text-muted); flex-basis: 100%; text-align: left; padding: 0; margin: -4px 0; }
.cs-why-chain .cs-why-final { background: var(--cobalt-bg); color: var(--cobalt-primary); }

/* ---------- Palette swatches ---------- */
.cs-palette-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 16px; margin-top: 4px; }
.cs-swatch { display: flex; align-items: center; gap: 10px; font-size: 0.88rem; color: var(--text-secondary); font-weight: 600; }
.cs-swatch span { width: 22px; height: 22px; border-radius: 6px; flex-shrink: 0; display: inline-block; }

/* ---------- Closing ---------- */
.cs-closing {
  background: var(--text-primary);
  color: #fff;
  padding: 90px 0;
  text-align: left;
}
.cs-icon-light { background: #fff; color: var(--text-primary); }
.cs-closing h2 { font-family: var(--font-heading); font-size: clamp(2.2rem, 5vw, 3.4rem); font-weight: 800; color: #fff; margin-bottom: 12px; }
.cs-closing-tagline { color: var(--cobalt-light); font-size: 1.2rem; font-weight: 700; margin-bottom: 32px; }
.cs-closing .card-contact-item { color: #fff; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .cs-hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .cs-glance-grid { grid-template-columns: repeat(2, 1fr); }
  .cs-challenge-grid { grid-template-columns: 1fr; }
  .cs-approach-grid { grid-template-columns: 1fr; }
  .cs-surface-grid { grid-template-columns: 1fr; }
  .cs-feature-grid, .cs-feature-grid-reverse { grid-template-columns: 1fr; }
  .cs-feature-grid-reverse > img { order: 0; }
  .cs-twocol-desc { grid-template-columns: 1fr; gap: 20px; }
}

@media (max-width: 640px) {
  .cs-glance-grid { grid-template-columns: 1fr; }
  .card-contact-details { flex-direction: column; align-items: flex-start !important; gap: 10px; }
}