/* StableKYT design system — v1.0
   Identity-blue accent (T6 domain color).
   Know Your Transaction — ongoing monitoring, behavioral risk scoring, analytics integration.
   "The third leg of the Identity Triad: KYC (humans) + KYA (agents) + KYT (transactions)." */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --font-sans:  'Inter', ui-sans-serif, system-ui, sans-serif;
  --font-mono:  'IBM Plex Mono', 'Fira Code', ui-monospace, monospace;

  /* Foundation */
  --bg-primary:       #FFFFFF;
  --bg-secondary:     #F8FAFC;
  --bg-tertiary:      #F1F5F9;
  --bg-dark-panel:    #0a0e17;

  /* Text */
  --text-primary:     #0F172A;
  --text-secondary:   #475569;
  --text-muted:       #94A3B8;

  /* Accent — Identity Blue (T6 domain) */
  --accent:           #3B6CB5;
  --accent-hover:     #2D5A9E;
  --accent-wash:      #DBEAFE;
  --accent-border:    #93C5FD;
  --accent-dim:       rgba(59, 108, 181, 0.08);

  /* Status */
  --status-pass:      #059669;
  --status-fail:      #DC2626;
  --status-warn:      #D97706;
  --status-info:      #2563EB;

  /* Domain colors (for diagrams) */
  --domain-identity:  #3B6CB5;
  --domain-discovery: #7E5EAD;
  --domain-reserves:  #B8860B;
  --domain-transfer:  #2D8E85;
  --domain-execution: #C2693D;
  --domain-token:     #3D8E6A;
  --domain-reporting: #8B3A4A;

  /* Borders */
  --border:     #E2E8F0;
  --border-mid: #CBD5E1;

  /* Legacy compat (dark panel React components) */
  --bg:         var(--bg-dark-panel);
  --bg-raised:  #131B2E;
  --bg-card:    #182036;
}

html {
  background: var(--bg-primary);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body { min-height: 100vh; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

/* ── Primary nav ── */
.primary-nav {
  display: flex;
  align-items: center;
  gap: 0;
  padding: 0 1.5rem;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  height: 56px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-primary);
  text-decoration: none;
  margin-right: 2rem;
  flex-shrink: 0;
}

.nav-logo:hover { text-decoration: none; color: var(--text-primary); }

.nav-logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--accent);
  color: white;
  font-size: 0.65rem;
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex: 1;
  overflow-x: auto;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.75rem;
  border-radius: 6px;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}

.nav-link:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
  text-decoration: none;
}

.nav-link--active {
  background: var(--accent-wash);
  color: var(--accent-hover);
}

.nav-github {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.375rem 0.75rem;
  border-radius: 6px;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background 0.15s, color 0.15s;
}

.nav-github:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
  text-decoration: none;
}

/* ── Layout ── */
.container { max-width: 1120px; margin: 0 auto; padding: 0 1.5rem; }
.container--narrow { max-width: 800px; }

/* ── Hero ── */
.hero {
  padding: 5rem 1.5rem 4rem;
  text-align: center;
  max-width: 780px;
  margin: 0 auto;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: clamp(2.25rem, 5vw, 3rem);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 1.25rem;
}

.hero-tagline {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 600px;
  margin: 0 auto 2.25rem;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.5rem;
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  border: none;
  white-space: nowrap;
}

.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn--primary { background: var(--accent); color: white; }
.btn--primary:hover {
  background: var(--accent-hover);
  color: white;
  box-shadow: 0 4px 12px rgba(59, 108, 181, 0.25);
}

.btn--secondary {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-mid);
}

.btn--secondary:hover {
  background: var(--bg-secondary);
  border-color: var(--accent-border);
  color: var(--text-primary);
}

/* ── Sections / Bands ── */
.section { padding: 4.5rem 1.5rem; }
.section--alt { background: var(--bg-secondary); }
.section--dark { background: var(--bg-dark-panel); color: #f1f5f9; }

.section-header { margin-bottom: 2.5rem; }
.section-header--center { text-align: center; }

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.6rem;
}

.section--dark .section-eyebrow { color: var(--accent-border); }

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.section--dark .section-title { color: #f1f5f9; }

.section-body {
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 680px;
  margin-top: 0.75rem;
  font-size: 0.9375rem;
}

.section--dark .section-body { color: #94a3b8; }
.section-body--center { margin-left: auto; margin-right: auto; }

/* ── Smart Brevity ── */
.smart-brevity ul {
  list-style: none;
  padding-left: 0;
  margin-top: 0.75rem;
}

.smart-brevity li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.5rem;
  line-height: 1.55;
}

.smart-brevity li::before {
  content: '\25B8';
  position: absolute;
  left: 0;
  color: var(--text-muted);
}

.section--alt .smart-brevity li::before,
.section .smart-brevity li::before {
  color: var(--text-secondary);
}

/* ── Card Grid ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}

.card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.75rem;
  background: var(--bg-primary);
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.12s;
}

.card:hover {
  border-color: var(--accent-border);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
  transform: translateY(-2px);
}

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--accent-wash);
  color: var(--accent);
  font-size: 1.125rem;
  margin-bottom: 1rem;
}

.card-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
  line-height: 1.3;
}

.card-desc {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 0.75rem;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* ── Badges ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.2em 0.55em;
  border-radius: 4px;
}

.badge--gate { background: rgba(59, 108, 181, 0.08); color: var(--accent); }
.badge--monitor { background: rgba(37, 99, 235, 0.08); color: var(--status-info); }
.badge--obligation { background: rgba(217, 119, 6, 0.08); color: var(--status-warn); }
.badge--live { background: rgba(5, 150, 105, 0.08); color: var(--status-pass); }
.badge--coinbase { background: rgba(0, 82, 255, 0.08); color: #0052FF; }
.badge--circle { background: rgba(0, 191, 99, 0.08); color: #00BF63; }
.badge--cloudflare { background: rgba(245, 130, 32, 0.08); color: #F58220; }
.badge--chainalysis { background: rgba(59, 108, 181, 0.08); color: #3B6CB5; }
.badge--elliptic { background: rgba(45, 142, 133, 0.08); color: #2D8E85; }
.badge--trm { background: rgba(126, 94, 173, 0.08); color: #7E5EAD; }

/* ── Split layout ── */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
  margin-top: 1.5rem;
}

.split-text pre {
  margin-top: 0;
  overflow-x: auto;
}

@media (max-width: 768px) {
  .split { grid-template-columns: 1fr; }
}

/* ── POC section ── */
.poc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

.poc-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg-primary);
}

.poc-card-header {
  padding: 1.75rem 1.75rem 0;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.poc-card-number {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.poc-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
  margin-top: 0.25rem;
  margin-bottom: 0.5rem;
}

.poc-card-tagline {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.poc-card-body {
  padding: 1.75rem;
}

.poc-card-badges {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

/* ── Code blocks ── */
.code-block {
  background: var(--bg-dark-panel);
  border-radius: 8px;
  overflow: auto;
  margin-top: 1rem;
  position: relative;
}

.code-block pre {
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.6;
  color: #e2e8f0;
  white-space: pre;
  overflow-x: auto;
}

.code-block-label {
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #64748b;
}

/* ── Illustration wrapper ── */
.illustration-wrapper {
  max-width: 960px;
  margin: 0 auto;
}

/* ── Triad cards ── */
.triad-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.triad-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.75rem;
  background: var(--bg-primary);
  text-align: center;
}

.triad-card--active {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.triad-card-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 10px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: white;
  margin-bottom: 1rem;
}

.triad-card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.triad-card-desc {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

@media (max-width: 768px) {
  .triad-grid { grid-template-columns: 1fr; }
}

/* ── Network footer ── */
.network-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
}

.network-footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.network-footer-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: background 0.15s, color 0.15s;
}

.network-footer-link:hover {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  text-decoration: none;
}

.network-footer-sep {
  color: var(--border-mid);
  font-size: 0.7rem;
  user-select: none;
}

.network-footer-note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* ── Dark-panel code variant ── */
.section--dark .code-block {
  background: #131B2E;
  border: 1px solid rgba(148,163,184,0.1);
}

/* ── Comparison Table ── */
.comparison-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-primary);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.comparison-table th {
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  padding: 0.875rem 1rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  font-size: 0.82rem;
  white-space: nowrap;
}

.comparison-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  vertical-align: top;
}

.comparison-table tr:last-child td { border-bottom: none; }

.comparison-table td:first-child {
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
}

/* ── Vendor comparison grid ── */
.vendor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.vendor-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.75rem;
  background: var(--bg-primary);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.vendor-card:hover {
  border-color: var(--accent-border);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.vendor-card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.vendor-card-desc {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* ── Pattern cards ── */
.pattern-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}

.pattern-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.75rem;
  background: var(--bg-primary);
  border-left: 4px solid var(--status-warn);
}

.pattern-card--high { border-left-color: var(--status-fail); }
.pattern-card--medium { border-left-color: var(--status-warn); }
.pattern-card--low { border-left-color: var(--status-info); }

.pattern-card-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.pattern-card-desc {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* ── Page header (secondary pages) ── */
.page-header {
  background: var(--bg-dark-panel);
  padding: 4rem 1.5rem 3rem;
  text-align: center;
}

.page-header .hero-eyebrow { color: var(--accent-border); }
.page-header .hero-title { color: #f1f5f9; }
.page-header .hero-tagline { color: #94a3b8; }

/* ── Gap matrix ── */
.gap-matrix {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.75rem;
}

.gap-cell {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  font-size: 0.82rem;
}

.gap-cell--covered {
  border-color: var(--status-pass);
  background: rgba(5, 150, 105, 0.04);
}

.gap-cell--gap {
  border-color: var(--status-fail);
  border-style: dashed;
  background: rgba(220, 38, 38, 0.04);
}

.gap-cell-label {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.gap-cell-status {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.gap-cell--covered .gap-cell-status { color: var(--status-pass); }
.gap-cell--gap .gap-cell-status { color: var(--status-fail); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .card-grid { grid-template-columns: 1fr; }
  .vendor-grid { grid-template-columns: 1fr; }
  .pattern-grid { grid-template-columns: 1fr; }
  .gap-matrix { grid-template-columns: repeat(2, 1fr); }
}