/* Case Studies (/case-studies and /case-studies/<slug>): index and shared styles.
   Builds on the live tokens in /css/variables.css (loaded first). Approved design: v1, 4 Nov 2026. */
html, body { overscroll-behavior-y: none; }
:root {
  --cs-ink: #0F1923;
  --cs-text: #3A4856;
  --cs-muted: #556473;
  --cs-gold: #7A5A00;
  --cs-line: #E2E8F0;
  --cs-soft: #F8FAFB;
  --cs-mark: linear-gradient(transparent 60%, rgba(245, 194, 66, 0.6) 60%, rgba(245, 194, 66, 0.6) 92%, transparent 92%);
  --cs-r-card: 1.5rem;
  --cs-ease: cubic-bezier(0.22, 1, 0.36, 1);
}
body { color: var(--cs-ink); }
.cs-main p { color: var(--cs-text); }

/* Focus states */
.cs-main a:focus-visible, .cs-main button:focus-visible {
  outline: 3px solid #0F1923; outline-offset: 3px; border-radius: 0.5rem;
  box-shadow: 0 0 0 6px rgba(245, 194, 66, 0.55);
}

/* One-shot reveal (only when JS is on, so content never hides without it) */
.cs-js [data-reveal] { opacity: 0; transform: translateY(14px); transition: opacity 600ms var(--cs-ease), transform 600ms var(--cs-ease); }
.cs-js [data-reveal].is-in { opacity: 1; transform: none; }
.cs-js [data-reveal="2"] { transition-delay: 80ms; }
.cs-js [data-reveal="3"] { transition-delay: 160ms; }
@media (prefers-reduced-motion: reduce) { .cs-js [data-reveal] { opacity: 1; transform: none; transition: none; } }

/* Hero (index and detail) */
.cs-hero { position: relative; overflow: hidden; padding: calc(var(--header-total-h) + 4rem) 0 3rem; background: var(--white); }
.cs-hero::before { content: ''; position: absolute; inset: 0; background-image: radial-gradient(circle, #DCE3EB 1px, transparent 1px); background-size: 24px 24px; opacity: 0.55; pointer-events: none; }
.cs-hero::after { content: ''; position: absolute; inset: -20% -10% auto auto; width: 46rem; height: 34rem; background: radial-gradient(closest-side, rgba(245, 194, 66, 0.2), transparent 70%), radial-gradient(closest-side at 20% 60%, rgba(170, 191, 222, 0.3), transparent 70%); pointer-events: none; }
.cs-hero > .container { position: relative; z-index: 1; }
.cs-eyebrow { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.4rem 0.9rem; border-radius: var(--r-full); background: rgba(245, 194, 66, 0.14); border: 1px solid rgba(245, 194, 66, 0.45); color: var(--cs-gold); font-size: var(--fs-xs); font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }
.cs-eyebrow::before { content: ''; width: 0.45rem; height: 0.45rem; border-radius: 50%; background: var(--yellow); }
.cs-hero-grid { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); gap: 3rem; align-items: end; margin-top: 1.25rem; }
.cs-h1 { font-size: clamp(2.4rem, 4.6vw, 4rem); line-height: 1.04; letter-spacing: -0.035em; font-weight: 800; color: var(--cs-ink); }
.cs-mark { background: var(--cs-mark); padding: 0; -webkit-box-decoration-break: clone; box-decoration-break: clone; }
.cs-intro { font-size: var(--fs-lg); line-height: 1.65; max-width: 30rem; }
.cs-main .cs-count { display: flex; align-items: center; gap: 0.6rem; margin-top: 1rem; font-size: var(--fs-xs); font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; color: var(--cs-ink); }
.cs-count::before { content: ''; width: 1.5rem; height: 3px; border-radius: 2px; background: var(--yellow); }

/* Logo chip */
.cs-logo-chip { align-self: flex-start; display: inline-flex; align-items: center; gap: 0.6rem; height: 3rem; padding: 0.35rem 0.75rem; background: var(--white); border: 1px solid var(--cs-line); border-radius: 0.875rem; box-shadow: 0 6px 18px -10px rgba(15, 25, 35, 0.25); }
.cs-logo-chip img { height: 100%; width: auto; max-width: 9.5rem; object-fit: contain; border-radius: 0.35rem; }
.cs-logo-chip span { font-size: var(--fs-sm); font-weight: 700; color: var(--cs-ink); white-space: nowrap; }
.cs-logo-chip.sm { height: 2.75rem; padding: 0.3rem 0.6rem; }
.cs-logo-chip.dark.sm { height: 3.5rem; padding: 0.2rem; }
.cs-logo-chip.dark { background: #3A3A3A; border-color: #3A3A3A; }
.cs-logo-chip.dark img { border-radius: 0.25rem; }

/* Tags and status */
.cs-main .cs-tagline { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--cs-muted); line-height: 1.6; }
.cs-tagline b { color: var(--cs-gold); font-weight: 700; }
.cs-status { display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.2rem 0.6rem; border-radius: var(--r-full); background: #FFF4D6; color: #6B4E00; font-size: 0.7rem; font-weight: 700; letter-spacing: 0.04em; }

/* Featured case */
.cs-featured-sec { padding: 1rem 0 3.5rem; }
.cs-featured { display: grid; grid-template-columns: 1fr 1.15fr; gap: 1.25rem; padding: 1.25rem; background: var(--white); border: 1px solid var(--cs-line); border-radius: 2rem; box-shadow: 0 30px 60px -40px rgba(15, 25, 35, 0.35); }
.cs-featured-body { display: flex; flex-direction: column; gap: 1rem; padding: 1.5rem 1.25rem 1.25rem; }
.cs-featured-top { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.75rem; }
.cs-featured h2 { font-size: clamp(2.25rem, 3.6vw, 3.25rem); letter-spacing: -0.03em; font-weight: 800; line-height: 1.05; margin-top: 0.75rem; }
.cs-featured-body p { font-size: var(--fs-lg); max-width: 28rem; }
.cs-featured-body .btn { align-self: flex-start; margin-top: auto; }
.cs-fstats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.6rem; margin: 0.5rem 0 1.25rem; }
.cs-fstat { display: flex; flex-direction: column; gap: 0.5rem; padding: 0.9rem 0.9rem 0.95rem; border: 1px solid var(--cs-line); border-radius: 1rem; background: var(--cs-soft); }
.cs-fstat b { font-size: 1.6rem; font-weight: 800; letter-spacing: -0.03em; line-height: 1; color: var(--cs-ink); }
.cs-fstat span { margin-top: auto; font-size: 0.78rem; line-height: 1.45; color: var(--cs-muted); }
.btn-ink { background: var(--cs-ink); color: var(--white); border-radius: var(--r-full); padding: 0.8rem 1.4rem; }
.btn-ink:hover { background: #1F2F3F; transform: translateY(-1px); }
.btn-ink i { transition: transform 200ms var(--cs-ease); }
.btn-ink:hover i { transform: translateX(3px); }

/* Visual panels (decorative motifs built from the case's own facts) */
.cs-visual { position: relative; overflow: hidden; border-radius: 1.25rem; padding: 1.5rem; display: flex; flex-direction: column; justify-content: space-between; gap: 1.25rem; }
.cs-visual::before { content: ''; position: absolute; inset: 0; background-image: radial-gradient(circle, rgba(15, 25, 35, 0.09) 1px, transparent 1px); background-size: 18px 18px; pointer-events: none; }
.cs-visual > * { position: relative; }
.tint-integ { background: linear-gradient(140deg, #FFF3D2 0%, #F3F1E6 45%, #DFE8F5 100%); }
.tint-impl { background: linear-gradient(140deg, #E8EFF9 0%, #D6E1F1 100%); }
.tint-mis { background: linear-gradient(140deg, #F1F2E6 0%, #DFE4C9 100%); }
.tint-ai { background: linear-gradient(140deg, #FFF7E0 0%, #F4E8C6 100%); }
.cs-visual .cs-vis-head { font-size: 1.3rem; line-height: 1.25; font-weight: 800; letter-spacing: -0.02em; color: var(--cs-ink); max-width: 20rem; }
.cs-visual .cs-vis-head strong { font-weight: 800; background: var(--cs-mark); }
.cs-visual .cs-vis-foot { font-size: 0.68rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: #46525E; }
.cs-flow { display: flex; align-items: center; gap: 0.5rem; }
.cs-flow-col { display: flex; flex-direction: column; gap: 0.45rem; }
.cs-node { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.5rem 0.8rem; border-radius: 0.75rem; background: var(--white); border: 1px solid rgba(15, 25, 35, 0.08); box-shadow: 0 8px 18px -12px rgba(15, 25, 35, 0.4); font-size: 0.8rem; font-weight: 600; color: var(--cs-ink); white-space: nowrap; }
.cs-node i { color: #5A6B2C; font-size: 0.75rem; }
.cs-node.hub { background: var(--cs-ink); color: var(--white); padding: 0.7rem 1rem; font-weight: 700; }
.cs-node.hub i { color: var(--yellow); }
.cs-wires { flex: 1; min-width: 2rem; height: 11rem; }
.cs-wires path { fill: none; stroke: rgba(15, 25, 35, 0.28); stroke-width: 1.5; stroke-dasharray: 3 4; }
.cs-js .cs-wires path { stroke-dashoffset: 40; transition: stroke-dashoffset 1200ms var(--cs-ease); }
.cs-js .is-in .cs-wires path { stroke-dashoffset: 0; }
.cs-chain { display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem; }
.cs-featured .cs-visual .cs-vis-head { font-size: 1.75rem; max-width: 26rem; }
.cs-chain .sep { color: #46525E; font-size: 0.7rem; }

/* Filters */
.cs-grid-sec { padding: 0 0 4rem; }
.cs-filters { display: flex; flex-direction: column; gap: 0.9rem; padding-bottom: 1.25rem; margin-bottom: 1.75rem; border-bottom: 1px solid var(--cs-line); }
.cs-filters-label { font-size: var(--fs-xs); font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--cs-ink); }
.cs-chips { display: flex; gap: 0.5rem; overflow-x: auto; scrollbar-width: none; padding: 0.25rem; margin: -0.25rem; }
.cs-chips::-webkit-scrollbar { display: none; }
.cs-chip { flex: none; display: inline-flex; align-items: center; gap: 0.45rem; padding: 0.55rem 1rem; border-radius: var(--r-full); border: 1px solid var(--cs-line); background: var(--white); color: var(--cs-text); font: 600 var(--fs-sm)/1 var(--font); cursor: pointer; transition: background 200ms ease, border-color 200ms ease, color 200ms ease; }
.cs-chip:hover { border-color: var(--yellow); background: rgba(245, 194, 66, 0.08); }
.cs-chip .chip-n { font-size: 0.72rem; color: var(--cs-muted); font-weight: 700; }
.cs-chip.active { background: var(--yellow); border-color: var(--yellow); color: var(--cs-ink); }
.cs-chip.active .chip-n { color: var(--cs-ink); }
.cs-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* Card grid */
.cs-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 1.5rem; row-gap: 0; }
.cs-card { display: grid; grid-row: span 2; grid-template-rows: subgrid; row-gap: 0; margin-bottom: 1.5rem; padding: 0.75rem 0.75rem 1.25rem; background: var(--white); border: 1px solid var(--cs-line); border-radius: var(--cs-r-card); color: inherit; transition: box-shadow 250ms ease, transform 250ms var(--cs-ease), border-color 250ms ease; }
.cs-card:hover { box-shadow: 0 24px 44px -28px rgba(15, 25, 35, 0.4); transform: translateY(-3px); border-color: #D3DCE6; }
.cs-card .cs-visual { min-height: 14rem; }
.cs-vis-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 0.75rem; }
.cs-card-body { display: flex; flex-direction: column; gap: 0.55rem; flex: 1; padding: 1rem 0.75rem 0; }
.cs-card h3 { font-size: 1.4rem; font-weight: 800; letter-spacing: -0.02em; line-height: 1.2; }
.cs-card .cs-sum { font-size: var(--fs-sm); line-height: 1.6; }
.cs-more { line-height: 1.2; margin-top: auto; padding-top: 0.5rem; display: inline-flex; align-items: center; gap: 0.5rem; font-size: 0.72rem; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase; color: var(--cs-ink); }
.cs-more i { transition: transform 200ms var(--cs-ease); }
.cs-card:hover .cs-more i { transform: translateX(4px); }
[hidden] { display: none !important; }

/* Zoho band */
.cs-zoho-sec { padding: 0 0 3rem; }
.cs-zoho { display: grid; grid-template-columns: 1fr 1.1fr; gap: 2.5rem; align-items: center; padding: 2.5rem; background: var(--cs-soft); border: 1px solid var(--cs-line); border-radius: 2rem; }
.cs-lockup { display: flex; align-items: center; gap: 1.25rem; margin-bottom: 1.5rem; }
.cs-lockup .up { height: 5rem; width: auto; }
.cs-lockup .bar { width: 1px; height: 4rem; background: #CBD5E0; }
.cs-lockup .badge-z { height: 5rem; width: 5rem; padding: 4px; }
.cs-zoho h2 { font-size: clamp(1.75rem, 2.6vw, 2.25rem); font-weight: 800; letter-spacing: -0.02em; line-height: 1.15; }
.cs-zoho-copy p { margin-top: 0.75rem; max-width: 30rem; }
.cs-zoho-fine { margin-top: 1rem; font-size: var(--fs-xs); color: var(--cs-muted) !important; }
.cs-zoho-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.6rem; }
.cs-zlink { display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; padding: 0.85rem 1rem; background: var(--white); border: 1px solid var(--cs-line); border-radius: 0.875rem; font-size: var(--fs-sm); font-weight: 700; color: var(--cs-ink); transition: border-color 200ms ease, transform 200ms var(--cs-ease), box-shadow 200ms ease; }
.cs-zlink i { font-size: 0.75rem; color: var(--cs-muted); }
.cs-zlink:hover { border-color: var(--yellow); transform: translateY(-1px); box-shadow: 0 10px 20px -16px rgba(15, 25, 35, 0.5); }
.cs-zlink.all { grid-column: 1 / -1; background: var(--yellow); border-color: var(--yellow); justify-content: center; }
.cs-zlink.all i { color: var(--cs-ink); }

/* Closing band */
.cs-cta-sec { padding: 0 0 5rem; }
.cs-cta { position: relative; overflow: hidden; display: flex; align-items: center; justify-content: space-between; gap: 2rem; padding: 2.5rem 2.75rem; background: var(--cs-ink); border-radius: 2rem; }
.cs-cta::after { content: ''; position: absolute; right: -6rem; top: -8rem; width: 26rem; height: 22rem; background: radial-gradient(closest-side, rgba(245, 194, 66, 0.22), transparent 70%); pointer-events: none; }
.cs-cta > * { position: relative; z-index: 1; }
.cs-cta h2 { color: var(--white); font-size: clamp(1.6rem, 2.6vw, 2.1rem); font-weight: 800; letter-spacing: -0.02em; line-height: 1.2; }
.cs-cta p { color: #C9D3DD !important; margin-top: 0.5rem; max-width: 36rem; }
.cs-cta-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem 1.25rem; flex: none; }
.cs-cta .btn-primary { border-radius: var(--r-full); padding: 0.85rem 1.5rem; color: var(--cs-ink); }
.cs-cta-mail { color: #E6ECF2; font-size: var(--fs-sm); font-weight: 600; text-decoration: underline; text-underline-offset: 3px; }
.btn-ghost-light { border: 1px solid rgba(255, 255, 255, 0.35); color: var(--white); border-radius: var(--r-full); padding: 0.8rem 1.3rem; }
.btn-ghost-light:hover { border-color: var(--yellow); background: rgba(245, 194, 66, 0.12); }

@media (max-width: 1024px) {
  .cs-hero-grid { grid-template-columns: 1fr; gap: 1.5rem; align-items: start; }
  .cs-featured { grid-template-columns: 1fr; }
  .cs-zoho { grid-template-columns: 1fr; gap: 1.75rem; }
  .cs-cta { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 768px) {
  .cs-hero { padding: calc(var(--header-total-h) + 2.5rem) 0 2rem; }
  .cs-grid { grid-template-columns: minmax(0, 1fr); }
  .cs-fstats { grid-template-columns: minmax(0, 1fr); }
  .cs-fstat { gap: 0.4rem; }
  .cs-featured { padding: 0.75rem; border-radius: 1.5rem; }
  .cs-featured-body { padding: 1rem 0.5rem 0.75rem; }
  .cs-zoho { padding: 1.5rem 1.25rem; border-radius: 1.5rem; }
  .cs-zoho-links { grid-template-columns: 1fr; }
  .cs-lockup .up, .cs-lockup .badge-z { height: 4rem; }
  .cs-lockup .badge-z { width: 4rem; }
  .cs-cta { padding: 1.75rem 1.5rem; border-radius: 1.5rem; }
  .cs-visual { padding: 1.1rem; }
  .cs-visual .cs-vis-head { font-size: 1.15rem; }
  .cs-featured .cs-visual .cs-vis-head { font-size: 1.3rem; }
  .cs-wires { height: 9.5rem; }
  .cs-node { font-size: 0.74rem; padding: 0.42rem 0.65rem; }
}

/* Skip link */
.cs-skip { position: absolute; left: 1rem; top: -4rem; z-index: 1000; padding: 0.6rem 1rem; background: var(--cs-ink); color: var(--white); border-radius: 0.5rem; font-weight: 700; }
.cs-skip:focus { top: 1rem; }
.cs-lockup img { flex: none; }