/* ==========================================================================
   SGRusso.com — Structural & Component Architecture
   Hallmark · macrostructure: asymmetric-technical-dossier
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background-color: var(--bg-canvas);
  color: var(--ink-primary);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--duration-base) var(--ease-out),
              color var(--duration-base) var(--ease-out);
}

::selection {
  background-color: var(--accent-primary);
  color: var(--accent-ink);
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea,
select {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: var(--space-3);
  z-index: 1000;
  padding: var(--space-2) var(--space-4);
  background: var(--accent-primary);
  color: var(--accent-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
}

.skip-link:focus {
  left: var(--space-4);
}

/* ==========================================================================
   Architectural Dossier Frame
   Continuous vertical 1px structural rails bounding the 1240px canvas
   ========================================================================== */

.dossier-shell {
  max-width: var(--container-max);
  margin: 0 auto;
  border-left: 1px solid var(--border-subtle);
  border-right: 1px solid var(--border-subtle);
  min-height: 100vh;
}

@media (max-width: 1260px) {
  .dossier-shell {
    border-left: none;
    border-right: none;
  }
}

/* ==========================================================================
   Top Specification Header (Non-Cliché Engineering Rail)
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background-color: var(--bg-canvas);
  background-color: color-mix(in oklch, var(--bg-canvas) 90%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  min-height: 58px;
}

.brand-cell {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0 var(--space-5);
  height: 100%;
  border-right: 1px solid var(--border-subtle);
}

.brand-monogram {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--border-strong);
  background: var(--bg-surface);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink-primary);
  position: relative;
}

.brand-monogram::after {
  content: "";
  position: absolute;
  top: 3px;
  right: 3px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent-primary);
}

.brand-meta {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand-role {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--ink-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0 var(--space-4);
  overflow-x: auto;
  scrollbar-width: none;
}

.primary-nav::-webkit-scrollbar {
  display: none;
}

.nav-link {
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-secondary);
  letter-spacing: 0.03em;
  white-space: nowrap;
  border-radius: var(--radius-xs);
  transition: color var(--duration-fast) ease, background-color var(--duration-fast) ease;
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--ink-primary);
  background-color: var(--bg-hover);
}

.nav-link .nav-idx {
  color: var(--ink-muted);
  margin-right: 4px;
}

.nav-link.is-active .nav-idx {
  color: var(--accent-primary);
}

.header-controls {
  display: flex;
  align-items: stretch;
  height: 58px;
  border-left: 1px solid var(--border-subtle);
}

.rail-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0 var(--space-4);
  background: transparent;
  border: none;
  border-right: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-secondary);
  cursor: pointer;
  transition: background-color var(--duration-fast) ease, color var(--duration-fast) ease;
  white-space: nowrap;
}

.rail-btn:last-child {
  border-right: none;
}

.rail-btn:hover {
  background-color: var(--bg-hover);
  color: var(--ink-primary);
}

.rail-btn--resume {
  color: var(--accent-primary);
  font-weight: 500;
}

.rail-btn--resume:hover {
  background-color: var(--accent-subtle);
  color: var(--accent-hover);
}

.kbd-hint {
  padding: 2px 5px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xs);
  font-size: 0.6875rem;
  color: var(--ink-muted);
  background: var(--bg-recessed);
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
}

/* ==========================================================================
   Hero — Asymmetric 7:5 Blueprint Split (Zero Centered Hero Cliché)
   ========================================================================== */

.hero-section {
  display: grid;
  grid-template-columns: minmax(0, 1.38fr) minmax(320px, 1fr);
  border-bottom: 1px solid var(--border-subtle);
}

.hero-editorial {
  position: relative;
  overflow: hidden;
  padding: var(--space-8) var(--space-7);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-7);
  border-right: 1px solid var(--border-subtle);
  background-image: radial-gradient(var(--grid-dot) 1px, transparent 1px);
  background-size: 20px 20px;
}

.hero-signal-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.85;
}

.hero-content-layer {
  position: relative;
  z-index: 1;
}

.telemetry-line {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-secondary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--status-ok);
  box-shadow: 0 0 0 3px var(--status-ok-subtle);
  flex-shrink: 0;
  animation: statusPulse 2.8s ease-in-out infinite;
}

.hero-headline {
  margin: var(--space-4) 0 var(--space-5);
  font-family: var(--font-sans);
  font-size: var(--text-display);
  font-weight: 600;
  line-height: 1.07;
  letter-spacing: -0.032em;
  color: var(--ink-primary);
}

.hero-headline em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--accent-primary);
  letter-spacing: -0.015em;
}

.hero-lead {
  margin: 0;
  max-width: 60ch;
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--ink-secondary);
}

.hero-lead strong {
  color: var(--ink-primary);
  font-weight: 500;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.72rem 1.25rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: all var(--duration-fast) ease;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: var(--accent-ink);
  border: 1px solid var(--accent-primary);
}

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

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--ink-primary);
  border: 1px solid var(--border-strong);
}

.btn-secondary:hover {
  background-color: var(--bg-hover);
  border-color: var(--ink-muted);
}

.btn-ghost {
  background: transparent;
  color: var(--ink-secondary);
  border: 1px solid transparent;
  padding-left: 0.75rem;
  padding-right: 0.75rem;
}

.btn-ghost:hover {
  color: var(--ink-primary);
  background: var(--bg-hover);
}

/* Right Column: Architectural Specification Ledger */
.hero-ledger {
  display: flex;
  flex-direction: column;
  background-color: var(--bg-surface);
}

.ledger-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.ledger-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-bottom: 1px solid var(--border-subtle);
}

.metric-cell {
  padding: var(--space-5);
  border-right: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.metric-cell:nth-child(2n) {
  border-right: none;
}

.metric-cell:nth-last-child(-n+2) {
  border-bottom: none;
}

.metric-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--ink-primary);
  font-variant-numeric: tabular-nums;
  margin-bottom: var(--space-1);
}

.metric-label {
  display: block;
  font-size: var(--text-xs);
  color: var(--ink-muted);
  line-height: 1.35;
}

.ledger-rows {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.ledger-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  border-bottom: 1px solid var(--border-subtle);
  font-size: var(--text-sm);
  align-items: baseline;
}

.ledger-row:last-child {
  border-bottom: none;
}

.ledger-key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.ledger-val {
  color: var(--ink-primary);
  font-weight: 400;
}

.ledger-val a {
  border-bottom: 1px solid var(--border-strong);
  transition: border-color var(--duration-fast) ease, color var(--duration-fast) ease;
}

.ledger-val a:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

/* ==========================================================================
   Section Structural Header Pattern
   ========================================================================== */

.dossier-section {
  border-bottom: 1px solid var(--border-subtle);
}

.section-rail {
  display: grid;
  grid-template-columns: 240px 1fr;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
}

.section-index-cell {
  padding: var(--space-5);
  border-right: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-2);
}

.section-index-num {
  color: var(--accent-primary);
  font-weight: 500;
}

.section-title-cell {
  padding: var(--space-6) var(--space-7);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.section-title {
  margin: 0;
  font-size: var(--text-2xl);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.024em;
}

.section-subtitle {
  margin: 0;
  max-width: 68ch;
  color: var(--ink-secondary);
  font-size: var(--text-base);
}

/* ==========================================================================
   Section 01 — Flagship Spotlight: Sovereign Enterprise AI Architecture
   Interactive Topology Blueprint + Layer Specification Inspector
   ========================================================================== */

.ai-platform-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.95fr);
}

.ai-diagram-pane {
  padding: var(--space-6) var(--space-7);
  border-right: 1px solid var(--border-subtle);
  background-color: var(--bg-recessed);
  background-image: radial-gradient(var(--grid-dot) 1px, transparent 1px);
  background-size: 16px 16px;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.diagram-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border-subtle);
}

.diagram-caption {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.topology-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.topology-node {
  width: 100%;
  text-align: left;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: var(--space-4) var(--space-5);
  cursor: pointer;
  display: grid;
  grid-template-columns: 76px 1fr auto;
  align-items: center;
  gap: var(--space-4);
  transition: border-color var(--duration-fast) ease,
              background-color var(--duration-fast) ease,
              transform var(--duration-fast) ease;
  position: relative;
}

.topology-node:hover {
  border-color: var(--border-strong);
  background-color: var(--bg-hover);
}

.topology-node.is-selected {
  border-color: var(--accent-primary);
  background-color: var(--accent-subtle);
}

.topology-node.is-selected::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  bottom: -1px;
  width: 3px;
  background-color: var(--accent-primary);
}

.node-layer-id {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.topology-node.is-selected .node-layer-id {
  color: var(--accent-primary);
  font-weight: 500;
}

.node-main {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.node-title {
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--ink-primary);
}

.node-tech-preview {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-secondary);
}

.node-indicator {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
}

.topology-node.is-selected .node-indicator {
  color: var(--accent-primary);
}

.topology-connector {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-left: 36px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--ink-muted);
}

.connector-line {
  width: 1px;
  height: 14px;
  background-color: var(--border-strong);
}

/* Right Pane: Live Layer Inspector */
.ai-inspector-pane {
  padding: var(--space-6) var(--space-6);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-6);
  background-color: var(--bg-canvas);
}

.inspector-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-2);
}

.inspector-title {
  margin: 0 0 var(--space-3);
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: -0.015em;
}

.inspector-summary {
  margin: 0 0 var(--space-5);
  color: var(--ink-secondary);
  font-size: var(--text-base);
}

.inspector-list {
  margin: 0 0 var(--space-5);
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.inspector-list li {
  position: relative;
  padding-left: var(--space-4);
  font-size: var(--text-sm);
  color: var(--ink-primary);
  line-height: 1.55;
}

.inspector-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--accent-primary);
  font-family: var(--font-mono);
}

.spec-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.spec-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 3px 8px;
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  color: var(--ink-secondary);
  letter-spacing: 0.02em;
}

.ai-outcomes-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
}

.outcome-cell {
  padding: var(--space-4) var(--space-5);
  border-right: 1px solid var(--border-subtle);
}

.outcome-cell:last-child {
  border-right: none;
}

.outcome-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.outcome-text {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--ink-primary);
}

/* ==========================================================================
   Section 02 — Selected Enterprise Case Studies (Interactive Ledger)
   Zero nested rounded cards; crisp tabular dossier rows with expandable specs
   ========================================================================== */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-7);
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-recessed);
}

.filter-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-right: var(--space-2);
}

.filter-chip {
  padding: 5px 12px;
  background: transparent;
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-secondary);
  cursor: pointer;
  transition: all var(--duration-fast) ease;
}

.filter-chip:hover {
  border-color: var(--border-strong);
  color: var(--ink-primary);
}

.filter-chip.is-active {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
  color: var(--accent-ink);
  font-weight: 500;
}

.case-ledger {
  display: flex;
  flex-direction: column;
}

.case-item {
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--duration-fast) ease;
}

.case-item:last-child {
  border-bottom: none;
}

.case-item[hidden] {
  display: none;
}

.case-trigger {
  width: 100%;
  background: transparent;
  border: none;
  padding: var(--space-5) var(--space-7);
  text-align: left;
  cursor: pointer;
  display: grid;
  grid-template-columns: 56px minmax(0, 1.3fr) minmax(0, 1fr) 92px;
  gap: var(--space-5);
  align-items: baseline;
  transition: background-color var(--duration-fast) ease;
}

.case-trigger:hover {
  background-color: var(--bg-hover);
}

.case-item.is-open .case-trigger {
  background-color: var(--bg-surface);
}

.case-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
  font-variant-numeric: tabular-nums;
}

.case-item.is-open .case-num {
  color: var(--accent-primary);
  font-weight: 500;
}

.case-heading-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.case-domain-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.case-title {
  margin: 0;
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--ink-primary);
}

.case-brief {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--ink-secondary);
  line-height: 1.55;
}

.case-toggle-label {
  justify-self: end;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.case-item.is-open .case-toggle-label {
  color: var(--accent-primary);
}

.case-detail-shell {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 360ms var(--ease-out);
  background-color: var(--bg-surface);
}

.case-item.is-open .case-detail-shell {
  grid-template-rows: 1fr;
}

.case-detail-inner {
  overflow: hidden;
  min-height: 0;
}

.case-detail {
  padding: 0 var(--space-7) var(--space-6) calc(var(--space-7) + 56px + var(--space-5));
  border-top: 1px dashed var(--border-subtle);
  opacity: 0;
  transform: translateY(-6px);
  transition: opacity 260ms ease, transform 320ms var(--ease-out);
}

.case-item.is-open .case-detail {
  opacity: 1;
  transform: translateY(0);
}

.case-detail-grid {
  padding-top: var(--space-5);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}

.detail-col-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
  display: block;
}

.detail-col p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--ink-secondary);
  line-height: 1.62;
}

.case-stack-footer {
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

/* ==========================================================================
   Section 03 — Domain Capabilities Matrix (6-Pillar Hairline Grid)
   ========================================================================== */

.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.capability-cell {
  padding: var(--space-6);
  border-right: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-5);
}

.capability-cell:nth-child(3n) {
  border-right: none;
}

.capability-cell:nth-last-child(-n+3) {
  border-bottom: none;
}

.cap-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.cap-code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
  letter-spacing: 0.05em;
}

.cap-title {
  margin: 0;
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.015em;
}

.cap-desc {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--ink-secondary);
  line-height: 1.55;
}

.cap-items {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.cap-items li {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 3px 8px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--ink-primary);
}

/* ==========================================================================
   Section 04 — 20+ Year Career Ledger & Credentials
   ========================================================================== */

.timeline-list {
  display: flex;
  flex-direction: column;
}

.timeline-entry {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  border-bottom: 1px solid var(--border-subtle);
}

.timeline-entry:last-child {
  border-bottom: none;
}

.timeline-meta {
  padding: var(--space-6) var(--space-5);
  border-right: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.timeline-dates {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--accent-primary);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.timeline-location {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
}

.timeline-sector {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--ink-secondary);
}

.timeline-body {
  padding: var(--space-6) var(--space-7);
}

.timeline-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.timeline-org {
  margin: 0;
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: -0.018em;
}

.timeline-role {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: var(--text-lg);
  color: var(--ink-secondary);
}

.timeline-summary {
  margin: 0 0 var(--space-4);
  color: var(--ink-secondary);
  font-size: var(--text-base);
  max-width: 70ch;
}

.timeline-highlights {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-2);
  max-width: 72ch;
}

.timeline-highlights li {
  position: relative;
  padding-left: var(--space-4);
  font-size: var(--text-sm);
  color: var(--ink-primary);
  line-height: 1.58;
}

.timeline-highlights li::before {
  content: "▪";
  position: absolute;
  left: 0;
  color: var(--ink-muted);
}

/* Education & Credentials Strip */
.credentials-strip {
  border-top: 1px solid var(--border-subtle);
  display: grid;
  grid-template-columns: 240px repeat(3, minmax(0, 1fr));
  background-color: var(--bg-recessed);
}

.cred-label-cell {
  padding: var(--space-5);
  border-right: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.cred-cell {
  padding: var(--space-5);
  border-right: 1px solid var(--border-subtle);
}

.cred-cell:last-child {
  border-right: none;
}

.cred-title {
  margin: 0 0 4px;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--ink-primary);
}

.cred-inst {
  margin: 0;
  font-size: var(--text-xs);
  color: var(--ink-secondary);
  line-height: 1.45;
}

/* ==========================================================================
   Section 05 — Direct Contact & Printable Executive Résumé Gateway
   ========================================================================== */

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
}

.contact-direct {
  padding: var(--space-7);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-6);
}

.contact-channels {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border-subtle);
}

.channel-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--border-subtle);
}

.channel-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.channel-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.channel-value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--ink-primary);
}

.channel-value:hover {
  color: var(--accent-primary);
}

.copy-btn {
  padding: 4px 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--ink-secondary);
  cursor: pointer;
  transition: all var(--duration-fast) ease;
}

.copy-btn:hover {
  border-color: var(--border-strong);
  color: var(--ink-primary);
}

.copy-btn.is-copied {
  border-color: var(--status-ok);
  color: var(--status-ok);
}

.resume-callout {
  padding: var(--space-5);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.resume-callout h3 {
  margin: 0;
  font-size: var(--text-base);
  font-weight: 600;
}

.resume-callout p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--ink-secondary);
}

/* Contact Form */
.contact-form-pane {
  padding: var(--space-7);
  background-color: var(--bg-surface);
}

.dispatch-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.form-row-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.field-input,
.field-textarea,
.field-select {
  width: 100%;
  padding: 10px 12px;
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  color: var(--ink-primary);
  font-size: var(--text-sm);
  transition: border-color var(--duration-fast) ease;
}

.field-input:focus,
.field-textarea:focus,
.field-select:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.field-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.form-status {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
}

.form-status.is-success {
  color: var(--status-ok);
}

/* ==========================================================================
   Footer Rail
   ========================================================================== */

.site-footer {
  padding: var(--space-5) var(--space-7);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
  background-color: var(--bg-recessed);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-links a:hover {
  color: var(--ink-primary);
}

/* ==========================================================================
   Command Palette Modal (⌘K / Ctrl+K Quick Jump)
   ========================================================================== */

.cmd-backdrop {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--backdrop-scrim);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 12vh var(--space-4) var(--space-4);
}

.cmd-backdrop[hidden] {
  display: none;
}

.cmd-dialog {
  width: 100%;
  max-width: 580px;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-modal);
  overflow: hidden;
}

.cmd-input-wrap {
  display: flex;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
  gap: var(--space-3);
}

.cmd-prompt {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--accent-primary);
}

.cmd-input {
  flex: 1;
  background: transparent;
  border: none;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--ink-primary);
}

.cmd-input:focus {
  outline: none;
}

.cmd-results {
  max-height: 340px;
  overflow-y: auto;
  margin: 0;
  padding: var(--space-2) 0;
  list-style: none;
}

.cmd-item {
  width: 100%;
  background: transparent;
  border: none;
  padding: var(--space-3) var(--space-4);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  text-align: left;
  cursor: pointer;
}

.cmd-item:hover,
.cmd-item.is-active {
  background-color: var(--bg-hover);
}

.cmd-item-title {
  font-size: var(--text-sm);
  color: var(--ink-primary);
}

.cmd-item-cat {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--ink-muted);
  text-transform: uppercase;
}

.cmd-footer {
  padding: var(--space-2) var(--space-4);
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-recessed);
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--ink-muted);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-section,
  .ai-platform-layout,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .hero-editorial,
  .ai-diagram-pane,
  .contact-direct {
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }

  .section-rail {
    grid-template-columns: 1fr;
  }

  .section-index-cell {
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: row;
    align-items: center;
    padding: var(--space-3) var(--space-5);
  }

  .section-title-cell {
    padding: var(--space-5);
  }

  .ai-outcomes-bar {
    grid-template-columns: repeat(2, 1fr);
  }

  .outcome-cell:nth-child(2) {
    border-right: none;
  }

  .outcome-cell:nth-child(1),
  .outcome-cell:nth-child(2) {
    border-bottom: 1px solid var(--border-subtle);
  }

  .capabilities-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .capability-cell:nth-child(3n) {
    border-right: 1px solid var(--border-subtle);
  }

  .capability-cell:nth-child(2n) {
    border-right: none;
  }

  .capability-cell:nth-last-child(-n+3) {
    border-bottom: 1px solid var(--border-subtle);
  }

  .capability-cell:nth-last-child(-n+2) {
    border-bottom: none;
  }

  .case-trigger {
    grid-template-columns: 42px 1fr auto;
  }

  .case-brief {
    grid-column: 2 / -1;
  }

  .case-detail {
    padding: 0 var(--space-5) var(--space-5);
  }

  .case-detail-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .timeline-entry {
    grid-template-columns: 1fr;
  }

  .timeline-meta {
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3) var(--space-5);
  }

  .timeline-sector {
    margin-top: 0;
  }

  .timeline-body {
    padding: var(--space-5);
  }

  .credentials-strip {
    grid-template-columns: 1fr;
  }

  .cred-label-cell,
  .cred-cell {
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }

  .cred-cell:last-child {
    border-bottom: none;
  }
}

@media (max-width: 760px) {
  .header-inner {
    grid-template-columns: 1fr auto;
  }

  .primary-nav {
    display: none;
    grid-column: 1 / -1;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-3) var(--space-4);
    border-top: 1px solid var(--border-subtle);
    background-color: var(--bg-surface);
  }

  .primary-nav.is-open {
    display: flex;
  }

  .mobile-menu-btn {
    display: inline-flex;
  }

  .cmd-btn-label,
  .kbd-hint {
    display: none;
  }

  .hero-editorial,
  .ai-diagram-pane,
  .ai-inspector-pane,
  .contact-direct,
  .contact-form-pane {
    padding: var(--space-5);
  }

  .filter-bar,
  .case-trigger,
  .site-footer {
    padding-left: var(--space-5);
    padding-right: var(--space-5);
  }

  .capabilities-grid,
  .ai-outcomes-bar,
  .form-row-split {
    grid-template-columns: 1fr;
  }

  .capability-cell,
  .outcome-cell {
    border-right: none !important;
    border-bottom: 1px solid var(--border-subtle) !important;
  }

  .capability-cell:last-child,
  .outcome-cell:last-child {
    border-bottom: none !important;
  }

  .topology-node {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }

  .node-indicator {
    display: none;
  }
}


/* ==========================================================================
   Kinetic Engineering Layer — Telemetry Pulses, Blueprint Choreography,
   Fluid View Transitions & Tactile Cursor Illumination
   ========================================================================== */

/* 1. Sticky Header Read-Progress Telemetry Line */
.scroll-progress-track {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: transparent;
  pointer-events: none;
  overflow: hidden;
}

.scroll-progress-bar {
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-hover));
  transform-origin: 0 50%;
  transform: scaleX(0);
  will-change: transform;
}

/* 2. Status Heartbeat & Button Micro-Physics */
@keyframes statusPulse {
  0%, 100% {
    box-shadow: 0 0 0 3px var(--status-ok-subtle);
    opacity: 1;
  }
  50% {
    box-shadow: 0 0 0 7px transparent;
    opacity: 0.78;
  }
}

.btn {
  position: relative;
  transition: transform 180ms var(--ease-out),
              background-color var(--duration-fast) ease,
              border-color var(--duration-fast) ease,
              color var(--duration-fast) ease,
              box-shadow 180ms var(--ease-out);
}

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

.btn:active {
  transform: translateY(0);
}

/* 3. Hero Entrance Stagger */
@keyframes heroRise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-stagger {
  animation: heroRise 680ms var(--ease-out) both;
}

.hero-stagger-1 { animation-delay: 40ms; }
.hero-stagger-2 { animation-delay: 120ms; }
.hero-stagger-3 { animation-delay: 210ms; }
.hero-stagger-4 { animation-delay: 300ms; }

/* 4. Enterprise AI Data-Packet Signal Conduits, Tour Progress & Inspector Crossfade */
.tour-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  transition: border-color var(--duration-fast) ease, color var(--duration-fast) ease;
}

.tour-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-primary);
  animation: statusPulse 2s ease-in-out infinite;
}

.tour-badge.is-paused .tour-dot {
  background-color: var(--ink-muted);
  animation: none;
}

.topology-node {
  overflow: hidden;
}

.topology-node:hover {
  transform: translateX(3px);
}

.topology-node.is-selected {
  transform: translateX(4px);
}

/* Auto-tour timer sweep along bottom of active AI layer */
@keyframes tourSweep {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.topology-node.is-selected.is-touring::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background-color: var(--accent-primary);
  opacity: 0.65;
  transform-origin: 0 50%;
  animation: tourSweep 5200ms linear forwards;
}

.connector-line {
  position: relative;
  width: 2px;
  height: 20px;
  background-color: var(--border-subtle);
  overflow: hidden;
}

@keyframes packetDrop {
  0% {
    transform: translateY(-100%);
    opacity: 0;
  }
  30% {
    opacity: 1;
  }
  80% {
    opacity: 1;
  }
  100% {
    transform: translateY(220%);
    opacity: 0;
  }
}

.connector-line::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 9px;
  background: linear-gradient(180deg, transparent, var(--accent-primary), var(--accent-hover));
  animation: packetDrop 2.1s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

.topology-connector:nth-of-type(2) .connector-line::after {
  animation-delay: 0.55s;
}

.topology-connector:nth-of-type(3) .connector-line::after {
  animation-delay: 1.1s;
}

@keyframes inspectorFadeSlide {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.inspector-content-anim {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-6);
  height: 100%;
  animation: inspectorFadeSlide 320ms var(--ease-out) both;
}

/* 5. Blueprint Scroll-Reveal & Hairline Plotting Choreography */
.section-rail {
  position: relative;
}

.section-rail::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, var(--accent-primary), transparent 65%);
  transform-origin: 0 50%;
  transform: scaleX(0);
  transition: transform 900ms var(--ease-out);
  pointer-events: none;
}

.section-rail.is-revealed::after {
  transform: scaleX(1);
}

.reveal-block {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 560ms var(--ease-out),
              transform 560ms var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}

.reveal-block.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Case Study Filter Re-entry Animation */
@keyframes caseFilterIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.case-item.is-filtering-in {
  animation: caseFilterIn 280ms var(--ease-out) both;
}

.case-trigger {
  transition: background-color var(--duration-fast) ease,
              padding-left 200ms var(--ease-out);
}

.case-trigger:hover .case-title {
  color: var(--accent-primary);
  transition: color var(--duration-fast) ease;
}

/* 6. Tactile Cursor-Tracked Surface Illumination (Linear-Style Subtle Sheen) */
.spotlight-surface {
  position: relative;
  overflow: hidden;
}

.spotlight-surface::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 260ms ease;
  background: radial-gradient(
    360px circle at var(--mx, 50%) var(--my, 50%),
    color-mix(in oklch, var(--accent-primary) 11%, transparent),
    transparent 65%
  );
}

.spotlight-surface:hover::before {
  opacity: 1;
}

.cap-items li,
.spec-tag {
  transition: border-color var(--duration-fast) ease,
              color var(--duration-fast) ease,
              transform 160ms var(--ease-out);
}

.cap-items li:hover,
.spec-tag:hover {
  border-color: var(--accent-border);
  color: var(--ink-primary);
  transform: translateY(-1px);
}

/* Command Palette Entrance */
@keyframes cmdModalIn {
  from {
    opacity: 0;
    transform: translateY(-8px) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.cmd-backdrop:not([hidden]) .cmd-dialog {
  animation: cmdModalIn 200ms var(--ease-out) both;
}

/* Native View Transition Polish for Slate <-> Paper Switch */
::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 280ms;
  animation-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-reduced-motion: reduce) {
  .hero-stagger,
  .reveal-block {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
  }
  .connector-line::after,
  .topology-node.is-selected.is-touring::after,
  .status-dot,
  .tour-dot {
    animation: none !important;
  }
}