.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.85rem;
  padding: 0.7rem 1.2rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 600;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition-fast);
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--color-ink);
  color: var(--color-surface);
}

.btn-primary:hover {
  background: var(--color-accent-strong);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  border-color: var(--color-ink);
  color: var(--color-ink);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-strong);
}

.btn-text {
  padding-inline: 0;
  min-height: auto;
  color: var(--color-accent-strong);
  text-decoration: none;
  font-weight: 600;
}

.btn-text::after {
  content: "→";
  display: inline-block;
  margin-left: 0.35em;
  transition: transform var(--transition);
}

.btn-text:hover::after {
  transform: translateX(3px);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--color-accent-soft);
  color: var(--color-accent-strong);
}

.tag {
  display: inline-flex;
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--color-muted);
}

.card-link {
  display: block;
  text-decoration: none;
  color: inherit;
  height: 100%;
}

.impact-grid,
.work-grid,
.decision-grid,
.lab-grid,
.insight-grid,
.toolkit-grid,
.capability-grid {
  display: grid;
  gap: var(--space-5);
}

.impact-card,
.work-card,
.decision-card,
.lab-card,
.insight-card,
.toolkit-card,
.arch-card {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: var(--card-padding);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.impact-card:hover,
.work-card:hover,
.decision-card:hover,
.lab-card:hover,
.insight-card:hover,
.toolkit-card:hover,
.arch-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: rgba(11, 110, 153, 0.35);
}

.impact-metric {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  letter-spacing: -0.03em;
  margin: var(--space-3) 0;
}

.impact-label {
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.impact-meta {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-line);
  font-size: 0.95rem;
}

.impact-meta strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 0.2rem;
  font-weight: 500;
}

.domain-strip {
  border-block: 1px solid var(--color-line);
  background: rgba(255, 253, 249, 0.7);
  padding: var(--space-5) 0;
}

.domain-strip-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
}

.domain-strip-list li {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-muted);
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-elevated);
}

.os-loop {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}

.os-loop span {
  padding: 0.45rem 0.7rem;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.04);
}

.os-loop .os-arrow {
  opacity: 0.55;
  border: 0;
  padding: 0;
  background: transparent;
}

.playbook {
  display: grid;
  gap: var(--space-5);
}

.playbook-stages {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.playbook-stage {
  text-align: left;
  border: 1px solid var(--color-line);
  background: var(--color-surface-elevated);
  border-radius: var(--radius-md);
  padding: var(--card-padding);
  transition: border-color var(--transition), background var(--transition);
}

.playbook-stage[aria-selected="true"] {
  border-color: var(--color-accent);
  background: linear-gradient(180deg, rgba(11,110,153,0.08), var(--color-surface-elevated));
}

.playbook-stage strong {
  display: block;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  font-size: 0.78rem;
}

.playbook-panel {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface-elevated);
  padding: var(--card-padding);
  max-width: none;
}

.playbook-panel[hidden] { display: none; }

.playbook-concepts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.intelligence {
  display: grid;
  gap: var(--space-5);
}

.intelligence-signals {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.intelligence-signals span {
  border: 1px solid var(--color-line);
  background: var(--color-surface-elevated);
  border-radius: var(--radius-md);
  padding: 0.55rem 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.intelligence-converge {
  position: relative;
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  background: var(--color-ink);
  color: #f4f1ec;
}

.intelligence-converge::before {
  content: "";
  display: block;
  width: 2px;
  height: 2rem;
  background: var(--color-accent);
  margin-bottom: var(--space-4);
}

.form {
  display: grid;
  gap: var(--space-5);
}

.form-field {
  display: grid;
  gap: var(--space-2);
}

.form-field label {
  font-weight: 600;
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 0.8rem 0.9rem;
  background: var(--color-surface-elevated);
}

.form-field textarea { min-height: 10rem; resize: vertical; }

.form-error {
  color: var(--color-danger);
  font-size: 0.9rem;
}

.form-success {
  border: 1px solid rgba(31, 107, 74, 0.35);
  background: rgba(31, 107, 74, 0.08);
  color: var(--color-success);
  padding: var(--space-4);
  border-radius: var(--radius-md);
}

.hp-field {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: 0.9rem;
  color: var(--color-muted);
  margin-bottom: var(--space-5);
}

.breadcrumb a { text-decoration: none; }

.prose {
  max-width: var(--content-max);
  margin-left: 0;
  margin-right: auto;
  display: grid;
  gap: var(--space-4);
}

.prose h2,
.prose h3 { margin-top: var(--space-5); }

.stack-sm { display: grid; gap: var(--space-3); }
.stack-md { display: grid; gap: var(--space-5); }
.cluster { display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: center; }

@media (min-width: 768px) {
  .impact-grid,
  .work-grid,
  .decision-grid,
  .lab-grid,
  .insight-grid,
  .toolkit-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .playbook {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: start;
  }
  .playbook-stages {
    grid-template-columns: 1fr;
  }
  .capability-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .impact-grid,
  .work-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .decision-grid,
  .lab-grid,
  .insight-grid,
  .toolkit-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .capability-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}


.contact-channels {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.contact-whatsapp {
  background: #075e54;
  width: fit-content;
}

.contact-whatsapp:hover {
  background: #0e6e63;
  color: #fff;
}

.contact-channels-meta {
  font-size: 0.95rem;
}

.contact-channels-meta a {
  color: var(--color-accent-strong);
}

.contact-divider {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: var(--space-2);
}

.contact-divider::before,
.contact-divider::after {
  content: "";
  height: 1px;
  background: var(--color-line);
}

/* ============================================================
   Dark surfaces
   ------------------------------------------------------------
   Light-theme component colours are declared as DIRECT rules
   (p, .eyebrow, .muted). A directly-matching rule always beats
   an inherited one, so setting `color` on a dark band does not
   reach its paragraphs — they keep the light-theme colour and
   silently fail WCAG contrast. Every dark surface therefore
   needs its own explicit colour scope.

   Measured ratios against --color-ink (#14171c):
     --on-dark-text   #e8e4dc  14.17:1
     --on-dark-muted  #b9c4cf  10.14:1
     --on-dark-accent #9ec9df  10.16:1
   ============================================================ */

.site-footer,
.os-section,
.closing,
.intelligence-converge {
  --on-dark-text: #e8e4dc;
  --on-dark-muted: #b9c4cf;
  --on-dark-accent: #9ec9df;
}

.site-footer p,
.site-footer li,
.site-footer strong,
.os-section p,
.os-section li,
.os-section strong,
.closing p,
.closing li,
.intelligence-converge p,
.intelligence-converge li {
  color: var(--on-dark-text);
}

.site-footer .muted,
.site-footer .footer-meta p,
.site-footer .footer-roles span,
.os-section .muted,
.closing .muted {
  color: var(--on-dark-muted);
}

.site-footer .eyebrow,
.os-section .eyebrow,
.closing .eyebrow {
  color: var(--on-dark-accent);
}

.site-footer h2,
.site-footer h3,
.os-section h2,
.os-section h3,
.os-section h4,
.closing h2 {
  color: var(--on-dark-text);
}