/* =====================================================
   Shared styles for case-study pages.
   Variables, nav, buttons, footer, and case-study layout.
   ===================================================== */

:root {
  --bg: #0a1628;
  --bg-2: #0f1e36;
  --surface: #142845;
  --surface-2: #1a3358;
  --border: rgba(94, 234, 212, 0.12);
  --border-strong: rgba(94, 234, 212, 0.28);
  --teal: #2dd4bf;
  --teal-bright: #5eead4;
  --teal-soft: rgba(45, 212, 191, 0.12);
  --teal-glow: rgba(45, 212, 191, 0.35);
  --text: #e2e8f0;
  --text-strong: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #8a9bb0;
  --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(45, 212, 191, 0.15);
  --radius: 16px;
  --radius-lg: 24px;
  --maxw: 1080px;
  --maxw-prose: 760px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: '';
  position: fixed;
  top: -10%; left: -10%;
  width: 50%; height: 50%;
  background: radial-gradient(circle, rgba(45, 212, 191, 0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}
body::after {
  content: '';
  position: fixed;
  bottom: -10%; right: -10%;
  width: 50%; height: 50%;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.05) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 32px;
  position: relative;
  z-index: 1;
}
.container--prose { max-width: var(--maxw-prose); }

/* ============ NAV (same look as main) ============ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 18px 0;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(10, 22, 40, 0.7);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}
.nav.scrolled {
  background: rgba(10, 22, 40, 0.85);
  border-bottom-color: var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo {
  font-family: 'Fraunces', serif;
  font-weight: 600;
  font-size: 22px;
  color: var(--text-strong);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.logo span { color: var(--teal); }
.nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
  align-items: center;
}
.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover { color: var(--teal-bright); background: var(--teal-soft); }
.nav-cta {
  background: var(--teal);
  color: var(--bg) !important;
  font-weight: 600 !important;
}
.nav-cta:hover { background: var(--teal-bright) !important; color: var(--bg) !important; }
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-strong);
  color: var(--text);
  width: 40px; height: 40px;
  border-radius: 8px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

/* ============ BUTTONS ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  transition: all var(--transition);
  border: 1px solid transparent;
  cursor: pointer;
  font-family: inherit;
}
.btn-primary {
  background: var(--teal);
  color: var(--bg);
  box-shadow: 0 10px 30px -10px var(--teal-glow);
}
.btn-primary:hover {
  background: var(--teal-bright);
  transform: translateY(-2px);
  box-shadow: 0 15px 40px -10px var(--teal-glow);
}
.btn-secondary {
  background: transparent;
  color: var(--text-strong);
  border-color: var(--border-strong);
}
.btn-secondary:hover {
  background: var(--teal-soft);
  border-color: var(--teal);
  color: var(--teal-bright);
}
.btn svg { width: 16px; height: 16px; }

/* ============ CASE STUDY HEADER ============ */
.cs-header {
  padding: 120px 0 48px;
  position: relative;
}

/* Breadcrumb trail */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 28px;
}
.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  padding: 4px 8px;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
}
.breadcrumb a:hover {
  color: var(--teal-bright);
  background: var(--teal-soft);
}
.breadcrumb .bc-sep {
  width: 12px;
  height: 12px;
  color: var(--text-dim);
  flex-shrink: 0;
  opacity: 0.6;
}
.breadcrumb [aria-current] {
  color: var(--text-strong);
  padding: 4px 8px;
}

/* Legacy back-link kept for fallback */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 28px;
  transition: color var(--transition), gap var(--transition);
}
.back-link:hover { color: var(--teal-bright); gap: 12px; }
.back-link svg { width: 16px; height: 16px; }

.cs-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.cs-eyebrow::before {
  content: '';
  width: 24px; height: 1px;
  background: var(--teal);
}
.cs-title {
  font-family: 'Fraunces', serif;
  font-size: clamp(36px, 5.5vw, 64px);
  line-height: 1.05;
  color: var(--text-strong);
  font-weight: 600;
  letter-spacing: -0.025em;
  margin-bottom: 20px;
  max-width: 900px;
}
.cs-title .accent {
  background: linear-gradient(135deg, var(--teal) 0%, #38bdf8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-style: italic;
  padding-right: 0.12em;
  margin-right: -0.04em;
}
.cs-subtitle {
  font-size: 20px;
  color: var(--text-muted);
  max-width: 720px;
  margin-bottom: 40px;
}

.cs-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 20px;
  padding: 24px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.cs-meta-item .label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 6px;
  font-weight: 600;
}
.cs-meta-item .value {
  color: var(--text-strong);
  font-size: 15px;
  font-weight: 500;
}

/* ============ ABSTRACT HERO VISUAL ============ */
.cs-visual {
  margin: 56px 0 72px;
  position: relative;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--surface) 0%, var(--surface-2) 100%);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cs-visual::before {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle, var(--teal-soft) 0%, transparent 50%);
  pointer-events: none;
}
.cs-visual-stage {
  position: relative;
  width: 70%;
  height: 70%;
  z-index: 2;
}
.viz-rect {
  position: absolute;
  border-radius: 12px;
  background: rgba(94, 234, 212, 0.08);
  border: 1px solid var(--border-strong);
  backdrop-filter: blur(8px);
}
.viz-rect.r1 { top: 0; left: 0; width: 60%; height: 50%; background: linear-gradient(135deg, rgba(45, 212, 191, 0.15), rgba(56, 189, 248, 0.08)); }
.viz-rect.r2 { bottom: 0; right: 0; width: 50%; height: 60%; }
.viz-rect.r3 { top: 20%; right: 10%; width: 30%; height: 30%; background: rgba(45, 212, 191, 0.18); }
.viz-bars {
  position: absolute;
  display: flex;
  align-items: end;
  gap: 8px;
  bottom: 12%;
  left: 8%;
  height: 30%;
}
.viz-bars span {
  width: 14px;
  background: linear-gradient(180deg, var(--teal), var(--teal-bright));
  border-radius: 4px 4px 0 0;
  opacity: 0.85;
}

/* ============ SECTIONS ============ */
.cs-section { padding: 64px 0; }
.cs-section--narrow { padding: 48px 0; }
.cs-section + .cs-section { padding-top: 16px; }

.cs-section h2 {
  font-family: 'Fraunces', serif;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.15;
  color: var(--text-strong);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  max-width: 720px;
}
.cs-section h3 {
  font-family: 'Fraunces', serif;
  font-size: 22px;
  color: var(--text-strong);
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.cs-section p {
  font-size: 17px;
  color: var(--text);
  margin-bottom: 18px;
  max-width: 720px;
}
.cs-section p:last-child { margin-bottom: 0; }
.cs-section .lead {
  font-size: 19px;
  color: var(--text-muted);
  margin-bottom: 32px;
}

/* ============ AT-A-GLANCE CARD ============ */
.at-a-glance {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-top: 24px;
}
.glance-cell {
  padding: 32px;
  border-right: 1px solid var(--border);
}
.glance-cell:last-child { border-right: none; }
.glance-cell .label {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--teal);
  font-weight: 600;
  margin-bottom: 12px;
  display: block;
}
.glance-cell p {
  color: var(--text-strong);
  font-size: 15px;
  margin-bottom: 0;
  line-height: 1.55;
}

/* ============ PROCESS / APPROACH GRID ============ */
.process-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 8px;
}
.process-step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
  transition: all var(--transition);
}
.process-step:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
}
.process-step .step-num {
  font-family: 'Fraunces', serif;
  font-size: 14px;
  color: var(--teal);
  font-weight: 600;
  margin-bottom: 16px;
  display: block;
}
.process-step .step-icon {
  width: 44px; height: 44px;
  background: var(--teal-soft);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--teal-bright);
  margin-bottom: 16px;
}
.process-step .step-icon svg { width: 22px; height: 22px; }
.process-step h3 {
  font-size: 18px;
  margin-bottom: 8px;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
}
.process-step p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 0;
}

/* ============ DECISIONS LIST ============ */
.decisions {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 12px;
}
.decision {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--teal);
  border-radius: var(--radius);
  padding: 28px 32px;
}
.decision h3 {
  font-family: 'Inter', sans-serif;
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--text-strong);
}
.decision p {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 0;
  max-width: none;
}

/* ============ OUTCOMES ============ */
.outcomes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 12px;
}
.outcome-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}
.outcome-card .num {
  font-family: 'Fraunces', serif;
  font-size: 36px;
  font-weight: 600;
  color: var(--teal-bright);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 10px;
  display: block;
}
.outcome-card .qual {
  font-family: 'Fraunces', serif;
  font-size: 22px;
  color: var(--teal-bright);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 10px;
}
.outcome-card p {
  font-size: 14px;
  color: var(--text-muted);
  margin: 0;
}

/* ============ REFLECTIONS ============ */
.reflections-list {
  display: grid;
  gap: 14px;
  margin-top: 12px;
}
.reflection {
  display: flex;
  gap: 16px;
  padding: 24px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.reflection .check {
  flex-shrink: 0;
  width: 32px; height: 32px;
  background: var(--teal-soft);
  color: var(--teal);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.reflection .check svg { width: 16px; height: 16px; }
.reflection p {
  margin: 0;
  font-size: 16px;
  color: var(--text);
}

/* ============ REQUEST FULL CASE STUDY (CTA) ============ */
.cs-cta {
  margin: 48px 0 56px;
  background: linear-gradient(135deg, var(--surface) 0%, var(--surface-2) 100%);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 48px;
  position: relative;
  overflow: hidden;
}
.cs-cta::before {
  content: '';
  position: absolute;
  top: -50%; right: -20%;
  width: 60%; height: 200%;
  background: radial-gradient(circle, var(--teal-soft) 0%, transparent 50%);
  pointer-events: none;
}
.cs-cta > * { position: relative; z-index: 1; }
.cs-cta h2 {
  font-family: 'Fraunces', serif;
  font-size: clamp(28px, 4vw, 40px);
  color: var(--text-strong);
  margin-bottom: 12px;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.cs-cta p {
  color: var(--text-muted);
  font-size: 17px;
  margin-bottom: 32px;
  max-width: 540px;
}
.cs-cta form {
  display: grid;
  gap: 12px;
  max-width: 480px;
}
.cs-cta .form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.cs-cta input,
.cs-cta textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-strong);
  font-family: inherit;
  font-size: 15px;
  transition: border-color var(--transition), background var(--transition);
}
.cs-cta input::placeholder,
.cs-cta textarea::placeholder {
  color: var(--text-dim);
}
.cs-cta input:focus,
.cs-cta textarea:focus {
  outline: none;
  border-color: var(--teal);
  background: var(--bg);
}
.cs-cta textarea {
  resize: vertical;
  min-height: 88px;
}
.cs-cta .form-submit {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 8px;
  flex-wrap: wrap;
}
.cs-cta .form-note {
  font-size: 13px;
  color: var(--text-dim);
  margin: 0;
  max-width: none;
  flex: 1;
  min-width: 200px;
}
.cs-cta .form-success {
  display: none;
  padding: 20px;
  background: var(--teal-soft);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  color: var(--teal-bright);
  font-weight: 500;
  align-items: center;
  gap: 12px;
}
.cs-cta .form-success.visible { display: flex; }
.cs-cta .form-success svg { width: 20px; height: 20px; flex-shrink: 0; }
.cs-cta .form-error {
  display: none;
  color: #fca5a5;
  font-size: 14px;
  margin-top: 8px;
}
.cs-cta .form-error.visible { display: block; }

/* ============ NEXT CASE STUDY ============ */
.cs-next {
  border-top: 1px solid var(--border);
  padding: 48px 0;
}
.cs-next-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-decoration: none;
  padding: 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  gap: 16px;
}
.cs-next-link:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
  transform: translateY(-3px);
}
.cs-next-link .label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 8px;
  font-weight: 600;
}
.cs-next-link .title {
  font-family: 'Fraunces', serif;
  font-size: 22px;
  color: var(--text-strong);
  font-weight: 600;
}
.cs-next-link .arrow {
  width: 40px; height: 40px;
  background: var(--teal-soft);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--teal-bright);
  transition: transform var(--transition);
  flex-shrink: 0;
}
.cs-next-link:hover .arrow { transform: translateX(4px); }

/* ============ FOOTER ============ */
footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
footer p { color: var(--text-dim); font-size: 14px; }
.footer-links {
  display: flex;
  gap: 20px;
  list-style: none;
}
.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--teal-bright); }

/* ============ REVEAL ============ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Screen-reader-only utility */
.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip-to-content link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 12px;
  background: var(--teal);
  color: var(--bg);
  padding: 12px 18px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  z-index: 1000;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 12px; }

/* Reduced motion: kill animations + reveals */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1 !important; transform: none !important; }
}

/* ============ RESPONSIVE ============ */
@media (max-width: 860px) {
  .at-a-glance { grid-template-columns: 1fr; }
  .glance-cell { border-right: none; border-bottom: 1px solid var(--border); }
  .glance-cell:last-child { border-bottom: none; }
  .cs-cta { padding: 36px 28px; }
  .cs-cta .form-row { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.open {
    display: flex;
    position: absolute;
    top: 70px; left: 16px; right: 16px;
    flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: 16px;
    padding: 12px;
    gap: 4px;
  }
  .nav-links.open a { padding: 12px 14px; }
  .cs-header { padding: 110px 0 40px; }
  .cs-section { padding: 56px 0; }
  .cs-visual { margin: 48px 0; }
  .container { padding: 0 20px; }
}

@media (max-width: 540px) {
  .cs-next-link { flex-direction: column; align-items: flex-start; }
  .cs-cta { padding: 28px 22px; }
  .glance-cell { padding: 24px; }
  .decision { padding: 22px 24px; }
  .process-step { padding: 22px; }
}