/* =============================================
   CASE STUDY PAGES
============================================= */
.cs-page #navbar { background: rgba(247, 247, 244, 0.94); border-bottom: 1px solid var(--border); }
.cs-narrow { max-width: 820px; }

/* Hero */
.cs-hero { padding: 140px 0 48px; }
.cs-back { display: inline-block; font-size: 0.82rem; color: var(--text-muted); margin-bottom: 1.75rem; transition: color var(--ease); }
.cs-back:hover { color: var(--copper); }
.cs-title {
  font-family: var(--font-serif); font-weight: 500; color: var(--charcoal);
  font-size: clamp(2.4rem, 5.5vw, 4rem); line-height: 1.08; max-width: 820px; margin-bottom: 1.25rem;
}
.cs-title em { color: var(--copper); font-style: italic; }
.cs-lede { font-size: 1.15rem; color: var(--text-muted); max-width: 640px; line-height: 1.7; margin-bottom: 1.5rem; }
.cs-hero-cta { display: flex; align-items: center; flex-wrap: wrap; gap: 0.75rem 1.25rem; margin-bottom: 2.5rem; }
.cs-hero-cta-text { font-family: var(--font-serif); font-size: 1.45rem; color: var(--charcoal); }

.cs-glance { display: grid; grid-template-columns: 1.6fr 1fr 0.8fr 1.4fr; gap: 1rem; }
.cs-glance-item { background: var(--white); border: 1px solid var(--border); border-radius: 10px; padding: 1.15rem 1.25rem; display: flex; flex-direction: column; gap: 0.35rem; }
.cs-glance-item--result { background: var(--charcoal); border-color: var(--charcoal); }
.cs-glance-label { font-size: 0.66rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--copper); }
.cs-glance-value { font-size: 0.9rem; line-height: 1.5; color: var(--charcoal); }
.cs-glance-item--result .cs-glance-value { color: var(--white); font-weight: 600; }

/* Chart */
.cs-chart-section { padding: 8px 0 24px; }
.cs-chart { background: var(--white); border: 1px solid var(--border); border-radius: 12px; padding: 2rem 2.25rem; box-shadow: var(--shadow-sm); }
.cs-chart-title { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 1.5rem; }
.cs-bar-row { display: grid; grid-template-columns: 140px 1fr 70px; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.cs-bar-label { font-size: 0.86rem; color: var(--text-muted); }
.cs-bar-track { height: 34px; background: var(--cream-alt); border-radius: 6px; overflow: hidden; }
.cs-bar { height: 100%; border-radius: 6px; }
.cs-bar--before { background: #C3C9D6; }
.cs-bar--after  { background: var(--copper); }
.cs-bar-value { font-family: var(--font-serif); font-size: 1.5rem; color: var(--text-muted); text-align: right; }
.cs-bar-value--after { color: var(--copper); }
.cs-chart-note { margin-top: 1.25rem; font-size: 0.95rem; color: var(--text-muted); }
.cs-chart-note strong { font-family: var(--font-serif); font-size: 1.6rem; color: var(--copper); font-weight: 600; margin-right: 0.35rem; }

/* Body copy */
.cs-section p { color: var(--text-muted); line-height: 1.8; margin-bottom: 1.1rem; font-size: 1rem; }
.cs-section p strong { color: var(--charcoal); }
.cs-section .section-heading { margin-bottom: 1.5rem; }

/* Steps */
.cs-steps { list-style: none; display: flex; flex-direction: column; gap: 1.25rem; margin-top: 0.5rem; }
.cs-step { display: grid; grid-template-columns: 52px 1fr; gap: 1.25rem; background: var(--white); border: 1px solid var(--border); border-radius: 10px; padding: 1.5rem 1.6rem; }
.cs-step-num {
  width: 44px; height: 44px; border-radius: 50%; background: var(--copper-bg); border: 1px solid var(--copper-border);
  color: var(--copper); font-family: var(--font-serif); font-size: 1.35rem; display: flex; align-items: center; justify-content: center;
}
.cs-step h3 { font-family: var(--font-serif); font-weight: 600; font-size: 1.3rem; color: var(--charcoal); margin-bottom: 0.5rem; line-height: 1.3; }
.cs-step p { margin-bottom: 0; }

/* Fixes */
.cs-fixes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.35rem; margin-top: 0.5rem; align-items: start; }
.cs-fix { background: var(--white); border: 1px solid var(--border); border-top: 3px solid var(--copper); border-radius: 10px; padding: 1.75rem 1.6rem; }
.cs-fix-icon { width: 44px; height: 44px; border-radius: 10px; background: var(--copper-bg); color: var(--copper); display: flex; align-items: center; justify-content: center; margin-bottom: 1rem; }
.cs-fix h3 { font-family: var(--font-serif); font-weight: 600; font-size: 1.3rem; color: var(--charcoal); margin-bottom: 0.75rem; }
.cs-fix p { font-size: 0.92rem; }
.cs-fix-stats { display: flex; flex-direction: column; gap: 0.5rem; margin-top: 0.5rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.cs-fix-stats span { font-size: 0.85rem; color: var(--text-muted); }
.cs-fix-stats strong { font-family: var(--font-serif); font-size: 1.25rem; color: var(--copper); font-weight: 600; margin-right: 0.25rem; }

/* Results */
.cs-results { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.15rem; margin-top: 0.5rem; }
.cs-result { background: var(--white); border: 1px solid var(--border); border-left: 3px solid var(--copper); border-radius: 10px; padding: 1.6rem 1.4rem; display: flex; flex-direction: column; gap: 0.5rem; }
.cs-result-num { font-family: var(--font-serif); font-size: 2.1rem; line-height: 1.1; color: var(--copper); }
.cs-result-label { font-size: 0.86rem; color: var(--text-muted); line-height: 1.55; }

/* Dark AI section */
.section--dark.cs-section p.cs-dark-lede { color: #FFFFFF; font-size: 1.05rem; }
.cs-ai-list { list-style: none; display: flex; flex-direction: column; gap: 0.9rem; margin-top: 0.5rem; }
.cs-ai-list li { position: relative; padding: 1.1rem 1.25rem 1.1rem 3rem; background: rgba(255,255,255,0.055); border: 1px solid rgba(255,255,255,0.1); border-radius: 10px; color: #FFFFFF; font-size: 0.95rem; line-height: 1.65; }
.cs-ai-list li::before { content: '\2726'; position: absolute; left: 1.2rem; top: 1.05rem; color: var(--copper); }
.cs-ai-list strong { color: var(--white); font-weight: 600; }

/* CTA */
.cs-cta { text-align: center; }
.cs-cta .section-heading { margin-bottom: 1.5rem; }

/* Responsive */
@media (max-width: 1060px) {
  .cs-glance  { grid-template-columns: 1fr 1fr; }
  .cs-fixes   { grid-template-columns: 1fr; }
  .cs-results { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .cs-hero { padding: 32px 0 32px; }
  .cs-back { margin-bottom: 1rem; }
  .cs-lede { font-size: 1.05rem; margin-bottom: 1.25rem; }
  .cs-hero-cta { flex-direction: column; align-items: flex-start; margin-bottom: 2rem; }
  .cs-hero-cta-text { font-size: 1.3rem; }
  .cs-glance { grid-template-columns: 1fr; gap: 0.75rem; }
  .cs-chart { padding: 1.5rem 1.25rem; }
  .cs-bar-row { grid-template-columns: 1fr 60px; gap: 0.4rem 0.75rem; }
  .cs-bar-label { grid-column: 1 / -1; }
  .cs-step { grid-template-columns: 1fr; gap: 0.75rem; padding: 1.35rem; }
  .cs-results { grid-template-columns: 1fr; }
  .cs-result-num { font-size: 1.85rem; }
}

@media (max-width: 380px) {
  .cs-hero { padding-top: 20px; }
  .cs-title { font-size: 2rem; margin-bottom: 0.9rem; }
  .cs-lede { font-size: 0.97rem; line-height: 1.6; margin-bottom: 1rem; }
  .cs-hero-cta-text { font-size: 1.15rem; }
  .cs-page .section-label { margin-bottom: 0.6rem; }
}

/* =============================================
   RETENTION TECH PAGE
============================================= */
.cs-byline { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 2rem; }
.rt-intro { margin-left: 0; padding-left: 0; }
.rt-intro p { color: var(--text-muted); font-size: 1.05rem; line-height: 1.8; margin-bottom: 1rem; }
.rt-intro strong { color: var(--charcoal); }
.rt-disclosure { font-size: 0.82rem !important; font-style: italic; }
.rt-jump { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.9rem; margin-top: 2rem; }
.rt-jump a { display: flex; flex-direction: column; gap: 0.2rem; background: var(--white); border: 1px solid var(--border); border-radius: 10px; padding: 1rem 1.15rem; font-family: var(--font-serif); font-size: 1.3rem; color: var(--charcoal); transition: border-color var(--ease), transform var(--ease); }
.rt-jump a:hover { border-color: var(--copper); transform: translateY(-2px); }
.rt-jump span { font-family: var(--font-sans); font-size: 0.7rem; font-weight: 700; letter-spacing: 0.12em; color: var(--copper); }
.rt-jump em { font-family: var(--font-sans); font-style: normal; font-size: 0.78rem; color: var(--text-muted); }

.rt-tools .container { display: flex; flex-direction: column; gap: 1.75rem; }
.rt-card { background: var(--white); border: 1px solid var(--border); border-radius: 12px; padding: 2rem 2.2rem; box-shadow: var(--shadow-sm); scroll-margin-top: 100px; }
.rt-card-head { display: flex; align-items: center; gap: 1.1rem; margin-bottom: 1.5rem; }
.rt-num { width: 52px; height: 52px; border-radius: 50%; background: var(--copper-bg); border: 1px solid var(--copper-border); color: var(--copper); font-family: var(--font-serif); font-size: 1.3rem; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.rt-tag { font-size: 0.68rem !important; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--copper) !important; margin-bottom: 0.15rem !important; }
.rt-name { font-family: var(--font-serif); font-weight: 600; font-size: 2rem; color: var(--charcoal); line-height: 1.1; }
.rt-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.rt-block h3 { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--charcoal-2); margin-bottom: 0.5rem; }
.rt-block p { font-size: 0.92rem; margin-bottom: 0; }
.rt-block a { color: var(--copper); font-weight: 600; }
.rt-foot { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 1.5rem; padding-top: 1.25rem; border-top: 1px solid var(--border); }
.rt-foot p { margin-bottom: 0; font-size: 0.9rem; color: var(--charcoal); line-height: 1.6; }
.rt-foot span { display: block; font-size: 0.66rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 0.25rem; }
.rt-unlocks { background: var(--copper-bg); border-radius: 8px; padding: 0.8rem 1rem; }
.rt-unlocks span { color: var(--copper); }
.rt-best { background: var(--cream-alt); border-radius: 8px; padding: 0.8rem 1rem; }
.rt-best span { color: var(--text-muted); }

@media (max-width: 1060px) {
  .rt-jump { grid-template-columns: 1fr 1fr; }
  .rt-grid { grid-template-columns: 1fr; gap: 1.1rem; }
}
@media (max-width: 720px) {
  .rt-card { padding: 1.4rem 1.25rem; }
  .rt-name { font-size: 1.65rem; }
  .rt-foot { grid-template-columns: 1fr; }
  .rt-jump a { font-size: 1.1rem; padding: 0.85rem 0.9rem; }
  .cs-byline { margin-bottom: 1.25rem; }
}