/* ==========================================================================
   ChainTrace — Premium Editorial Design System (Prism-Inspired)
   Light editorial aesthetic, subtle violet accent, crisp typography, generous whitespace.
   ========================================================================== */

:root {
  /* Surfaces & Canvas */
  --bg-app: #F5F4FA;
  --bg-surface: #FFFFFF;
  --bg-surface-subtle: #FAF9FD;
  --bg-surface-elevated: #FFFFFF;
  --bg-nav: rgba(255, 255, 255, 0.82);

  /* Typography */
  --text-primary: #191A25;
  --text-secondary: #656371;
  --text-muted: #8E8B9E;
  --text-dim: #AEA9BC;

  /* Accent & Brand */
  --accent-violet: #784AFF;
  --accent-violet-dark: #5F34E6;
  --accent-violet-light: #F3EFFF;
  --accent-violet-subtle: rgba(120, 74, 255, 0.08);
  --accent-violet-border: rgba(120, 74, 255, 0.28);
  --accent-violet-glow: rgba(120, 74, 255, 0.16);

  /* Subtle Borders & Separators */
  --border-subtle: #DDD9E8;
  --border-card: #E5E1EE;
  --border-focus: #784AFF;

  /* Verification Status Tokens (Light Editorial Palette) */
  --color-pass: #0D8C58;
  --color-pass-bg: #EBF8F2;
  --color-pass-border: #99E2BF;
  --color-pass-text: #065F38;

  --color-inconcl: #B45309;
  --color-inconcl-bg: #FEF8ED;
  --color-inconcl-border: #FCD34D;
  --color-inconcl-text: #8B3E03;

  --color-reval: #784AFF;
  --color-reval-bg: #F4EFFF;
  --color-reval-border: #DDD6FE;
  --color-reval-text: #5B27D9;

  --color-fail: #D92D20;
  --color-fail-bg: #FEF3F2;
  --color-fail-border: #FECACA;
  --color-fail-text: #B42318;

  --color-unverified: #656371;
  --color-unverified-bg: #F0EDF6;
  --color-unverified-border: #DDD9E8;

  /* Geometry & Radius */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, Menlo, Monaco, Consolas, monospace;

  /* Restrained Shadows */
  --shadow-nav: 0 4px 20px -2px rgba(25, 26, 37, 0.05), 0 0 1px rgba(25, 26, 37, 0.08);
  --shadow-card: 0 4px 24px -2px rgba(25, 26, 37, 0.04), 0 1px 2px rgba(25, 26, 37, 0.03);
  --shadow-elevated: 0 12px 36px -4px rgba(25, 26, 37, 0.08), 0 2px 4px rgba(25, 26, 37, 0.03);
  --shadow-interactive: 0 8px 30px -4px rgba(120, 74, 255, 0.12);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-app);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  overflow-x: hidden;
}

::selection {
  background: var(--accent-violet-light);
  color: var(--accent-violet-dark);
}

/* ==========================================================================
   Typography Utilities
   ========================================================================== */

.mono {
  font-family: var(--font-mono);
  font-feature-settings: 'tnum' on, 'zero' on;
}

h1, h2, h3, h4 {
  color: var(--text-primary);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

p {
  color: var(--text-secondary);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.18s ease;
}

/* ==========================================================================
   Buttons & Interactive Elements
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  text-decoration: none;
  white-space: nowrap;
}

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

.btn-primary {
  background-color: var(--accent-violet);
  color: #FFFFFF;
  border-color: var(--accent-violet);
  box-shadow: 0 2px 8px rgba(120, 74, 255, 0.25);
}

.btn-primary:hover {
  background-color: var(--accent-violet-dark);
  border-color: var(--accent-violet-dark);
  box-shadow: 0 4px 14px rgba(120, 74, 255, 0.32);
  transform: translateY(-1px);
}

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

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-subtle);
  box-shadow: var(--shadow-card);
}

.btn-secondary:hover {
  border-color: var(--accent-violet);
  color: var(--accent-violet);
  background-color: var(--bg-surface-subtle);
}

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

.btn-ghost:hover {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.btn-sm {
  padding: 0.45rem 0.95rem;
  font-size: 0.8125rem;
}

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: 0.9375rem;
}

/* ==========================================================================
   Header & Floating Navigation
   ========================================================================== */

.site-header {
  position: fixed;
  top: 1rem;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: center;
  padding: 0 1.25rem;
  pointer-events: none;
}

.header-inner {
  pointer-events: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1240px;
  background: var(--bg-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 0.5rem 1rem 0.5rem 1.25rem;
  box-shadow: var(--shadow-nav);
  transition: all 0.3s ease;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-symbol {
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-symbol svg {
  border-radius: 6px;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-primary);
}

.brand-tagline {
  font-size: 0.6875rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 400;
  transition: color 0.18s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link:focus-visible {
  outline: 2px solid var(--accent-violet);
  outline-offset: 4px;
  border-radius: var(--radius-xs);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.profile-badge {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.3rem 0.65rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-secondary);
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-pass);
}

.badge-dot.pulse {
  box-shadow: 0 0 0 0 rgba(13, 140, 88, 0.6);
  animation: pulse-green 2s infinite;
}

@keyframes pulse-green {
  0% { box-shadow: 0 0 0 0 rgba(13, 140, 88, 0.5); }
  70% { box-shadow: 0 0 0 6px rgba(13, 140, 88, 0); }
  100% { box-shadow: 0 0 0 0 rgba(13, 140, 88, 0); }
}

/* ==========================================================================
   01. Hero Section (Light Editorial with Responsive Particle Lattice)
   ========================================================================== */

.hero-section {
  position: relative;
  min-height: 94vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8rem 1.5rem 5rem;
  overflow: hidden;
  background-color: var(--bg-app);
}

.hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
  opacity: 0.85;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1080px;
  width: 100%;
  text-align: left;
}

.hero-overline {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.35rem 0.85rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  margin-bottom: 2rem;
  box-shadow: var(--shadow-card);
}

.overline-tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--accent-violet);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.overline-separator {
  color: var(--border-subtle);
  font-size: 0.625rem;
}

.overline-meta {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
}

.hero-title {
  font-size: clamp(2.75rem, 6.2vw, 5.25rem);
  font-weight: 350;
  letter-spacing: -0.04em;
  line-height: 1.06;
  color: var(--text-primary);
  margin-bottom: 1.75rem;
  max-width: 980px;
}

.hero-title-accent {
  color: var(--accent-violet);
  font-weight: 400;
}

.hero-description {
  font-size: clamp(1.0625rem, 1.8vw, 1.25rem);
  line-height: 1.65;
  color: var(--text-secondary);
  max-width: 720px;
  margin-bottom: 2.75rem;
  font-weight: 400;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 4rem;
  flex-wrap: wrap;
}

.hero-metrics-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border-subtle);
}

.metric-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.metric-val {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.metric-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-weight: 400;
}

/* ==========================================================================
   Editorial Sections & Layout
   ========================================================================== */

.section-wrapper {
  padding: 7rem 1.5rem;
  max-width: 1240px;
  margin: 0 auto;
  position: relative;
}

.section-header-editorial {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2.5rem;
  margin-bottom: 4rem;
  align-items: start;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-violet);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-label::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-violet);
}

.section-headline {
  font-size: clamp(2rem, 3.8vw, 3.25rem);
  font-weight: 350;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  letter-spacing: -0.035em;
}

.section-lead {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 780px;
}

/* ==========================================================================
   02. The Cross-Chain Verification Problem (Asymmetrical Cards)
   ========================================================================== */

.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

.editorial-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-card);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.editorial-card:hover {
  border-color: var(--border-card);
  box-shadow: var(--shadow-elevated);
  transform: translateY(-2px);
}

.card-num {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent-violet);
  margin-bottom: 1.5rem;
  font-weight: 600;
}

.card-title {
  font-size: 1.5rem;
  font-weight: 450;
  color: var(--text-primary);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.card-body {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 1.5rem;
}

.visual-equation {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.eq-fail {
  color: var(--color-fail-text);
  font-weight: 600;
}

.eq-pass {
  color: var(--color-pass-text);
  font-weight: 600;
}

/* ==========================================================================
   03. The Three-Stage Verification Trail
   ========================================================================== */

.pipeline-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
  margin-top: 2rem;
}

.pipeline-step {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  position: relative;
  transition: all 0.25s ease;
}

.pipeline-step:hover {
  border-color: var(--accent-violet-border);
  box-shadow: var(--shadow-interactive);
}

.step-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.step-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--accent-violet-light);
  color: var(--accent-violet-dark);
}

.step-connector {
  position: absolute;
  top: 50%;
  right: -1.1rem;
  width: 1.5rem;
  height: 2px;
  background: var(--border-subtle);
  z-index: 3;
}

.step-connector::after {
  content: "";
  position: absolute;
  right: 0;
  top: -3px;
  width: 6px;
  height: 6px;
  border-top: 2px solid var(--border-subtle);
  border-right: 2px solid var(--border-subtle);
  transform: rotate(45deg);
}

.step-title {
  font-size: 1.25rem;
  font-weight: 450;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.step-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.step-evidence-preview {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.875rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.evidence-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.35rem;
}

.evidence-row:last-child {
  margin-bottom: 0;
}

.evidence-label {
  color: var(--text-muted);
}

.evidence-val {
  color: var(--text-primary);
  font-weight: 500;
}

/* ==========================================================================
   04. Dependency-Aware Revalidation Section
   ========================================================================== */

.revalidation-interactive-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 3rem;
  box-shadow: var(--shadow-elevated);
}

.reval-top-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
  gap: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1.5rem;
}

.reval-info h3 {
  font-size: 1.35rem;
  font-weight: 450;
  margin-bottom: 0.35rem;
}

.reval-info p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.reval-graph-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  position: relative;
  margin-bottom: 2.5rem;
}

.reval-node {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

.reval-node.reval-affected {
  border-color: var(--color-reval-border);
  background: var(--color-reval-bg);
  box-shadow: 0 0 0 3px rgba(120, 74, 255, 0.15);
  animation: pulse-node 1.5s infinite;
}

@keyframes pulse-node {
  0% { transform: scale(1); }
  50% { transform: scale(1.02); }
  100% { transform: scale(1); }
}

.node-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.node-status-pill.verified {
  background: var(--color-pass-bg);
  color: var(--color-pass-text);
  border: 1px solid var(--color-pass-border);
}

.node-status-pill.revalidation {
  background: var(--color-reval-bg);
  color: var(--color-reval-text);
  border: 1px solid var(--color-reval-border);
}

.node-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.45rem;
}

.node-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* ==========================================================================
   05. Explorer & Investigation Workspace
   ========================================================================== */

.explorer-section {
  background-color: var(--bg-app);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.explorer-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-elevated);
  overflow: hidden;
}

/* Lookup Toolbar */
.explorer-toolbar {
  padding: 1.75rem 2rem;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.toolbar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.toolbar-title {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.search-box-row {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}

.chain-select {
  padding: 0.65rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  background: var(--bg-surface-subtle);
  color: var(--text-primary);
  cursor: pointer;
  outline: none;
  transition: border-color 0.18s ease;
}

.chain-select:focus {
  border-color: var(--accent-violet);
}

.hash-input-wrapper {
  position: relative;
  flex: 1;
  min-width: 280px;
}

.hash-input {
  width: 100%;
  padding: 0.65rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  background: var(--bg-surface-subtle);
  color: var(--text-primary);
  outline: none;
  transition: all 0.18s ease;
}

.hash-input:focus {
  border-color: var(--accent-violet);
  background: #FFFFFF;
  box-shadow: 0 0 0 3px var(--accent-violet-subtle);
}

.scenario-pill-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.scenario-pill {
  padding: 0.35rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  background: var(--bg-surface-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.18s ease;
}

.scenario-pill:hover {
  border-color: var(--accent-violet);
  color: var(--accent-violet);
  background: var(--bg-surface);
}

.scenario-pill.active {
  background: var(--accent-violet-light);
  border-color: var(--accent-violet);
  color: var(--accent-violet-dark);
  font-weight: 600;
}

/* Fixture Indicator Banner */
.fixture-banner {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1.5rem;
  background: var(--accent-violet-light);
  border-bottom: 1px solid var(--accent-violet-border);
  color: var(--accent-violet-dark);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.fixture-banner.visible {
  display: flex;
}

/* Trail Status Summary Header */
.trail-summary-strip {
  padding: 1.5rem 2rem;
  background: var(--bg-surface-subtle);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.trail-meta-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.trail-id-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.trail-id-hash {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-primary);
  font-weight: 500;
}

.status-badge-lg {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.status-badge-lg.verified {
  background: var(--color-pass-bg);
  border: 1px solid var(--color-pass-border);
  color: var(--color-pass-text);
}

.status-badge-lg.invalid {
  background: var(--color-fail-bg);
  border: 1px solid var(--color-fail-border);
  color: var(--color-fail-text);
}

.status-badge-lg.inconclusive {
  background: var(--color-inconcl-bg);
  border: 1px solid var(--color-inconcl-border);
  color: var(--color-inconcl-text);
}

.status-badge-lg.revalidation {
  background: var(--color-reval-bg);
  border: 1px solid var(--color-reval-border);
  color: var(--color-reval-text);
}

/* Two-Column Explorer Layout */
.explorer-body-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  min-height: 600px;
}

/* Left Column: DAG Canvas & List Fallback */
.dag-column {
  padding: 2rem;
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  background: #FFFFFF;
}

.column-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.column-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.dag-view-toggle {
  display: flex;
  gap: 0.35rem;
}

.toggle-btn {
  padding: 0.3rem 0.65rem;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  background: var(--bg-surface-subtle);
  color: var(--text-secondary);
  cursor: pointer;
}

.toggle-btn.active {
  background: var(--accent-violet);
  color: #FFFFFF;
  border-color: var(--accent-violet);
}

.svg-dag-viewport {
  width: 100%;
  height: 380px;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}

.accessible-list-view {
  display: none;
  flex-direction: column;
  gap: 0.75rem;
  max-height: 380px;
  overflow-y: auto;
}

.accessible-list-view.active {
  display: flex;
}

.claim-list-item {
  padding: 1rem 1.25rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.18s ease;
}

.claim-list-item:hover, .claim-list-item.selected {
  border-color: var(--accent-violet);
  background: var(--bg-surface);
  box-shadow: var(--shadow-card);
}

/* Right Column: Multi-Tab Inspector */
.inspector-column {
  padding: 2rem;
  background: var(--bg-surface-subtle);
  display: flex;
  flex-direction: column;
}

.tab-nav {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0.75rem;
  margin-bottom: 1.5rem;
}

.tab-btn {
  padding: 0.4rem 0.85rem;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.18s ease;
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  color: var(--accent-violet-dark);
  background: var(--accent-violet-light);
  font-weight: 600;
}

.inspector-tab-content {
  display: none;
  flex-direction: column;
  gap: 1.25rem;
}

.inspector-tab-content.active {
  display: flex;
}

.detail-card {
  background: #FFFFFF;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-card);
}

.detail-title {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.detail-val {
  font-size: 0.9375rem;
  color: var(--text-primary);
  line-height: 1.5;
}

.code-preview-block {
  background: #191A25;
  color: #E2E8F0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 1rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  max-height: 220px;
}

/* ==========================================================================
   06. Trust Assumptions & Protocol Limits
   ========================================================================== */

.trust-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.trust-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card);
}

.trust-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--accent-violet-light);
  color: var(--accent-violet);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.trust-title {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.trust-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   07. Editorial Footer
   ========================================================================== */

.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 5rem 1.5rem 3rem;
}

.footer-inner {
  max-width: 1240px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 3.5rem;
}

.footer-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2.5rem;
}

.footer-brand h2 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  max-width: 380px;
}

.footer-links {
  display: flex;
  gap: 3rem;
  flex-wrap: wrap;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.footer-col a {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.footer-col a:hover {
  color: var(--accent-violet);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  padding-top: 2rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

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

@media (max-width: 1024px) {
  .section-header-editorial {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .problem-grid, .pipeline-flow, .trust-grid {
    grid-template-columns: 1fr;
  }

  .step-connector {
    display: none;
  }

  .reval-graph-container {
    grid-template-columns: 1fr 1fr;
  }

  .explorer-body-grid {
    grid-template-columns: 1fr;
  }

  .dag-column {
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }
}

@media (max-width: 768px) {
  .site-nav {
    display: none;
  }

  .site-header {
    top: 0.5rem;
    padding: 0 0.75rem;
  }

  .hero-section {
    padding-top: 6.5rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .reval-graph-container {
    grid-template-columns: 1fr;
  }

  .revalidation-interactive-box {
    padding: 1.5rem;
  }

  .explorer-toolbar {
    padding: 1.25rem;
  }

  .dag-column, .inspector-column {
    padding: 1.25rem;
  }
}

/* Reduced Motion Mode */
@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;
  }
  .hero-canvas {
    display: none;
  }
}