/* ==========================================================
   ECHOSPHERE.IO — Design System
   Reconciling Human and Digital Ontologies
   
   Foundation: Authoritative & bold
   Typography: Cormorant Garamond / Source Sans 3 / IBM Plex Mono
   Palette: Deep navy, rich gold, warm ivory, charcoal
   ========================================================== */

/* --- DESIGN TOKENS --- */
:root {
  /* Backgrounds */
  --bg-primary: #F8F6F2;
  --bg-secondary: #EDE9E3;
  --bg-tertiary: #E2DDD5;
  --bg-accent: #D8D2C8;
  --bg-hero: #0F1419;
  --bg-nav: rgba(15,20,25,0.97);
  --bg-footer: #0F1419;
  --bg-code: #1A2030;
  --bg-dark: #141B2D;
  --bg-dark-alt: #1A2236;

  /* Text */
  --text-primary: #141210;
  --text-secondary: #3D3832;
  --text-tertiary: #6B6560;
  --text-light: #9A9490;
  --text-inverse: #F8F6F2;
  --text-inverse-secondary: rgba(248,246,242,0.7);

  /* Accent — Rich Gold */
  --accent-primary: #C49A3C;
  --accent-hover: #D4AA4C;
  --accent-deep: #A07828;
  --accent-sage: #4A7A5E;
  --accent-rule: #C49A3C;
  --accent-gold: #C49A3C;

  /* Borders */
  --border-light: #DDD8D0;
  --border-medium: #C8C0B5;
  --border-heavy: #A89E92;

  /* Interactive states */
  --interactive-pass: #2D7A3D;
  --interactive-fail: #B22222;
  --interactive-info: #2E5090;

  /* Typography */
  --font-display: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --font-body: 'Source Sans 3', 'Segoe UI', 'Helvetica Neue', sans-serif;
  --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-mono: 'IBM Plex Mono', 'Consolas', monospace;
  --font-mono-alt: 'JetBrains Mono', 'Consolas', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Layout */
  --max-width: 1100px;
  --max-reading: 700px;

  /* Transitions */
  --ease-default: 0.25s ease;
  --ease-slow: 0.4s ease;
}

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

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

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.65;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
}

/* --- TYPOGRAPHY --- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 { font-size: 2.8rem; letter-spacing: -0.01em; }
h2 { font-size: 2rem; }
h3 { font-size: 1.35rem; font-weight: 500; }
h4 { font-size: 1.1rem; font-weight: 600; font-family: var(--font-body); }

p {
  margin-bottom: var(--space-md);
  font-size: 1.05rem;
  max-width: var(--max-reading);
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--ease-default), color var(--ease-default);
}
a:hover {
  color: var(--accent-hover);
  border-bottom-color: var(--accent-hover);
}

ul, ol {
  margin-bottom: var(--space-md);
  padding-left: 1.5rem;
}
li {
  margin-bottom: var(--space-xs);
  font-size: 1.05rem;
}

strong { color: var(--text-primary); }
em { font-style: italic; }

/* --- NAVIGATION --- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(196,154,60,0.15);
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.9rem var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.nav-logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--accent-gold);
  letter-spacing: 0.02em;
  border-bottom: none;
  text-decoration: none;
}
.nav-logo:hover { color: var(--accent-hover); border-bottom: none; }
.nav-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
  padding: 0;
  margin: 0;
}
.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-inverse-secondary);
  border-bottom: none;
  letter-spacing: 0.01em;
  text-decoration: none;
}
.nav-links a:hover { color: var(--text-inverse); }
.nav-links a.active {
  color: var(--accent-gold);
  border-bottom: 2px solid var(--accent-gold);
  padding-bottom: 2px;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-inverse);
  cursor: pointer;
  padding: 0.25rem;
}

/* --- PAGE LAYOUT --- */
.page-content {
  padding-top: 120px; /* nav height */
}

/* --- SECTIONS --- */
.section {
  padding: var(--space-3xl) 0;
}
.section--alt {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}
.section--dark {
  background: var(--bg-dark);
  color: var(--text-inverse);
}
.section--dark h2 { color: var(--text-inverse); }
.section--dark p { color: var(--text-inverse-secondary); }
.section--dark .section-rule { background: var(--accent-gold); }
.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}
.section-header {
  margin-bottom: var(--space-2xl);
}
.section-header h2 {
  margin-bottom: var(--space-sm);
}
.section-rule {
  border: none;
  height: 2px;
  width: 50px;
  background: var(--accent-gold);
  margin: var(--space-sm) 0 var(--space-md);
}
.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 560px;
}

/* --- HERO --- */
.hero {
  padding: 10rem 0 5rem;
  background: var(--bg-hero);
  border-bottom: 2px solid var(--accent-gold);
}
.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-gold);
  margin-bottom: var(--space-md);
}
.hero h1 {
  margin-bottom: var(--space-lg);
  max-width: 700px;
  color: var(--text-inverse);
}
.hero-subtitle {
  font-size: 1.2rem;
  font-weight: 300;
  color: var(--text-inverse-secondary);
  max-width: 520px;
  line-height: 1.55;
}

/* --- INFO BOX --- */
.info-box {
  max-width: 560px;
  border: 1px solid var(--border-medium);
  border-left: 3px solid var(--accent-primary);
  border-radius: 2px;
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
  background: var(--bg-primary);
}
.info-box-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: var(--space-xs);
}
.info-box p {
  font-size: 0.93rem;
  color: var(--text-secondary);
  margin-bottom: 0;
  line-height: 1.55;
}
.info-box strong {
  color: var(--text-primary);
  font-weight: 600;
}
/* Info box in dark contexts */
.hero .info-box {
  background: rgba(255,255,255,0.05);
  border-color: rgba(196,154,60,0.3);
  border-left-color: var(--accent-gold);
}
.hero .info-box-label {
  color: var(--accent-gold);
}
.hero .info-box p {
  color: var(--text-inverse-secondary);
}
.hero .info-box strong {
  color: var(--text-inverse);
}

/* --- JOURNEY / PHASES --- */
.phases {
  max-width: 680px;
}
.phase-item {
  display: flex;
  gap: var(--space-lg);
  position: relative;
}
.phase-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
  width: 20px;
}
.phase-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border-medium);
  border: 2px solid var(--border-medium);
  flex-shrink: 0;
  margin-top: 6px;
}
.phase-dot--complete {
  background: var(--accent-sage);
  border-color: var(--accent-sage);
}
.phase-dot--active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px rgba(122,92,62,0.15);
}
.phase-line {
  width: 1px;
  flex: 1;
  background: var(--border-light);
  margin: var(--space-xs) 0;
}
.phase-content {
  padding-bottom: var(--space-2xl);
}
.phase-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-light);
  margin-bottom: var(--space-xs);
}
.phase-label--active {
  color: var(--accent-gold);
  font-weight: 500;
}
.phase-content h3 {
  margin-bottom: var(--space-sm);
}
.phase-content p {
  font-size: 0.98rem;
  color: var(--text-secondary);
}
.phase-link {
  display: inline-block;
  margin-top: var(--space-sm);
  font-size: 0.9rem;
  font-weight: 500;
}

/* --- APPLICATION CARDS --- */
.applications-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}
.app-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-top: 3px solid var(--accent-gold);
  border-radius: 4px;
  padding: var(--space-lg) var(--space-lg) var(--space-md);
  display: block;
  text-decoration: none !important;
  border-bottom: 1px solid var(--border-light) !important;
  transition: border-color var(--ease-default), box-shadow var(--ease-default), transform var(--ease-default);
  cursor: pointer;
}
.app-card:hover {
  border-color: var(--accent-gold) !important;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}
.app-card-icon {
  font-size: 1.3rem;
  margin-bottom: var(--space-sm);
  color: var(--accent-primary);
}
.app-card h4 {
  margin-bottom: 2px;
  color: var(--text-primary);
}
.app-domain {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--text-light);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm) !important;
}
.app-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}
.app-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--accent-primary);
}

/* --- FOUNDATIONS CHIPS --- */
.foundations-label {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-tertiary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}
.foundations-row {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}
.foundation-chip {
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.45rem 1rem;
  border: 1px solid var(--border-medium);
  border-radius: 3px;
  color: var(--text-secondary);
  background: var(--bg-primary);
  transition: border-color var(--ease-default);
  cursor: pointer;
  text-decoration: none;
}
.foundation-chip:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  border-bottom: 1px solid var(--accent-primary);
}

/* --- WHITE PAPERS --- */
.papers-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}
.paper-card {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--accent-gold);
  border-radius: 3px;
  padding: var(--space-lg);
  display: block;
  text-decoration: none !important;
  border-bottom: 1px solid var(--border-light) !important;
  transition: box-shadow var(--ease-default), transform var(--ease-default);
}
.paper-card:hover {
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}
.paper-type {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-gold);
  margin-bottom: var(--space-sm);
}
.paper-card h4 {
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
}
.paper-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}
.paper-meta {
  font-size: 0.8rem;
  color: var(--text-light);
  font-family: var(--font-mono);
}

/* --- AI TOOLS --- */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}
.tool-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: var(--space-lg);
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}
.tool-card-marker {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--accent-primary);
}
.tool-card h4 { margin-bottom: var(--space-xs); }
.tool-card p {
  font-size: 0.93rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}
.tool-status {
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--text-light);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.tool-card--featured {
  grid-column: span 2;
}

/* --- MANIFESTO SECTION --- */
.manifesto-section {
  text-align: center;
  padding: var(--space-3xl) 0;
  border-top: 2px solid var(--accent-gold);
  border-bottom: 2px solid var(--accent-gold);
  background: var(--bg-dark-alt);
}
.manifesto-inner {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}
.manifesto-quote {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-style: italic;
  font-weight: 400;
  line-height: 1.5;
  color: var(--text-inverse);
  margin-bottom: var(--space-xl);
  max-width: none;
}
.manifesto-link {
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--accent-gold);
}

/* --- TELOS SECTION --- */
.telos-section {
  text-align: center;
  padding: var(--space-2xl) 0;
  background: var(--bg-hero);
}
.telos-inner {
  max-width: 580px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}
.telos-greek {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-style: italic;
  color: var(--accent-gold);
  margin-bottom: var(--space-xs);
}
.telos-statement {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 600;
  color: var(--text-inverse);
  line-height: 1.3;
  margin-bottom: var(--space-sm);
  max-width: none;
}
.telos-sub {
  font-size: 1rem;
  color: var(--text-inverse-secondary);
  max-width: none;
}

/* --- CONTENT PAGES --- */
.content {
  max-width: 800px;
  margin: 0 auto;
  padding: 120px var(--space-xl) var(--space-3xl);
}
.content h1 {
  font-family: var(--font-display);
  font-size: 2.8rem;
  color: var(--text-primary);
  margin-bottom: var(--space-xl);
  text-align: center;
  font-weight: 600;
}
.content h2 {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--accent-primary);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-lg);
  border-bottom: 2px solid var(--border-light);
  padding-bottom: var(--space-sm);
}
.content h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--text-primary);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}
.content a {
  color: var(--accent-primary);
  border-bottom: 1px dotted var(--accent-rule);
}
.content a:hover {
  color: var(--accent-hover);
  border-bottom-style: solid;
}

/* --- TABLES --- */
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-xl) 0;
  font-size: 0.95rem;
}
th, td {
  border: 1px solid var(--border-light);
  padding: var(--space-md);
  text-align: left;
  vertical-align: top;
}
th {
  background: var(--bg-accent);
  color: var(--accent-primary);
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
}
td {
  background: var(--bg-primary);
}

/* --- ASCII / CODE BOX --- */
.ascii-box {
  font-family: var(--font-mono);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  padding: var(--space-xl);
  border-left: 3px solid var(--accent-primary);
  margin: var(--space-2xl) 0;
  white-space: pre-wrap;
  line-height: 1.5;
  font-size: 0.9rem;
  overflow-x: auto;
  border-radius: 2px;
}

/* --- INTERACTIVE TETRAHEDRON --- */
.tetra-container {
  width: 100%;
  max-width: 600px;
  margin: var(--space-xl) auto;
  aspect-ratio: 1;
  position: relative;
}
.tetra-canvas {
  width: 100%;
  height: 100%;
  cursor: grab;
}
.tetra-canvas:active {
  cursor: grabbing;
}
.tetra-info-panel {
  background: var(--bg-primary);
  border: 1px solid var(--border-medium);
  border-left: 3px solid var(--accent-primary);
  border-radius: 2px;
  padding: var(--space-md) var(--space-lg);
  margin-top: var(--space-lg);
  min-height: 120px;
  transition: opacity var(--ease-default);
}
.tetra-info-panel h4 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin-bottom: var(--space-xs);
  color: var(--accent-primary);
}
.tetra-info-panel p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}
.tetra-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-lg);
  margin-top: var(--space-md);
  font-size: 0.85rem;
  color: var(--text-tertiary);
}
.tetra-legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 3px;
  transition: background var(--ease-default);
}
.tetra-legend-item:hover {
  background: var(--bg-secondary);
}
.tetra-legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* --- DIAGNOSTIC TOOL --- */
.diagnostic-container {
  max-width: 700px;
  margin: 0 auto;
}
.diagnostic-input {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1.05rem;
  padding: var(--space-md) var(--space-lg);
  border: 2px solid var(--border-medium);
  border-radius: 4px;
  background: var(--bg-primary);
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--ease-default);
  resize: vertical;
  min-height: 80px;
}
.diagnostic-input:focus {
  border-color: var(--accent-primary);
}
.diagnostic-input::placeholder {
  color: var(--text-light);
}
.diagnostic-btn {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.7rem 1.8rem;
  background: var(--accent-primary);
  color: var(--text-inverse);
  border: none;
  border-radius: 3px;
  cursor: pointer;
  transition: background var(--ease-default);
  margin-top: var(--space-md);
}
.diagnostic-btn:hover {
  background: var(--accent-hover);
}
.diagnostic-results {
  margin-top: var(--space-xl);
}
.constraint-result {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border-light);
}
.constraint-indicator {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: white;
  margin-top: 2px;
}
.constraint-indicator.pass { background: var(--interactive-pass); }
.constraint-indicator.fail { background: var(--interactive-fail); }
.constraint-indicator.unknown { background: var(--text-light); }
.constraint-name {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 2px;
}
.constraint-question {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* --- CONTACT FORM --- */
.contact-form {
  max-width: 560px;
}
.form-group {
  margin-bottom: var(--space-lg);
}
.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}
.form-input,
.form-textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.65rem var(--space-md);
  border: 1px solid var(--border-medium);
  border-radius: 3px;
  background: var(--bg-primary);
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--ease-default);
}
.form-input:focus,
.form-textarea:focus {
  border-color: var(--accent-primary);
}
.form-textarea {
  resize: vertical;
  min-height: 140px;
}
.form-submit {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.7rem 2rem;
  background: var(--accent-primary);
  color: var(--text-inverse);
  border: none;
  border-radius: 3px;
  cursor: pointer;
  transition: background var(--ease-default);
}
.form-submit:hover {
  background: var(--accent-hover);
}
.form-note {
  font-size: 0.82rem;
  color: var(--text-light);
  margin-top: var(--space-sm);
}

/* --- NEWSLETTER SIGNUP --- */
.newsletter-box {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(196,154,60,0.3);
  border-radius: 4px;
  padding: var(--space-xl);
  text-align: center;
  max-width: 500px;
  margin: var(--space-2xl) auto;
}
.newsletter-box h4 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin-bottom: var(--space-sm);
  color: var(--text-inverse);
}
.newsletter-box p {
  font-size: 0.93rem;
  color: var(--text-inverse-secondary);
  max-width: none;
  text-align: center;
}
.newsletter-form {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}
.newsletter-input {
  flex: 1;
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 0.6rem var(--space-md);
  border: 1px solid var(--border-medium);
  border-radius: 3px;
  background: var(--bg-primary);
  outline: none;
}
.newsletter-input:focus {
  border-color: var(--accent-primary);
}
.newsletter-btn {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.6rem 1.2rem;
  background: var(--accent-gold);
  color: var(--bg-hero);
  border: none;
  border-radius: 3px;
  cursor: pointer;
  transition: background var(--ease-default);
  white-space: nowrap;
}
.newsletter-btn:hover {
  background: var(--accent-hover);
}

/* --- FOOTER --- */
.footer {
  background: var(--bg-footer);
  color: var(--text-inverse);
  padding: var(--space-2xl) 0 var(--space-lg);
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}
.footer-col h4 {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(250,250,248,0.45);
  margin-bottom: var(--space-md);
}
.footer-col a {
  display: block;
  font-size: 0.9rem;
  color: rgba(250,250,248,0.7);
  margin-bottom: var(--space-sm);
  border-bottom: none;
  text-decoration: none;
}
.footer-col a:hover { color: var(--text-inverse); }
.footer-bottom {
  border-top: 1px solid rgba(250,250,248,0.08);
  padding-top: var(--space-md);
  font-size: 0.82rem;
  color: rgba(250,250,248,0.35);
}

/* --- ANIMATIONS --- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.4s ease;
}

/* Scroll-triggered animations */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- RESPONSIVE --- */
@media (max-width: 900px) {
  .applications-grid { grid-template-columns: repeat(2, 1fr); }
  .tools-grid { grid-template-columns: 1fr; }
  .tool-card--featured { grid-column: span 1; }
  .papers-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.6rem; }
  .hero { padding: 7rem 0 3rem; }
  .applications-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links { gap: var(--space-md); }
  .section { padding: var(--space-2xl) 0; }
  .content { padding: 90px var(--space-lg) var(--space-2xl); }
  .content h1 { font-size: 2rem; }

  .mobile-menu-btn { display: block; }
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-hero);
    padding: var(--space-xl);
    border-bottom: 1px solid rgba(196,154,60,0.3);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  }
  .nav-links.open {
    display: flex;
  }

  .newsletter-form {
    flex-direction: column;
  }
}

@media (max-width: 600px) {
  .foundations-row { flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* --- COMING SOON CARDS --- */
.paper-card--coming {
  opacity: 0.5;
  pointer-events: none;
  position: relative;
  border-left-color: var(--border-medium);
}
.paper-card--coming .paper-meta {
  color: var(--accent-gold);
  font-weight: 600;
}

/* ============================================================
   ZONE 1 — THE VISION (Dark navy, inherited from hero/nav)
   ============================================================ */
.zone-vision {
  background: var(--bg-hero);
  color: var(--text-inverse);
}
.zone-vision h2,
.zone-vision h3 { color: var(--text-inverse); }
.zone-vision p { color: var(--text-inverse-secondary); }
.zone-vision .section-rule { background: var(--accent-gold); }
.zone-vision .phase-content p { color: var(--text-inverse-secondary); }
.zone-vision .phase-label { color: rgba(255,255,255,0.5); }
.zone-vision .phase-line { background: rgba(196,154,60,0.3); }
.zone-vision .phase-dot { border-color: rgba(255,255,255,0.3); }
.zone-vision .info-box {
  background: rgba(255,255,255,0.05);
  border-color: rgba(196,154,60,0.3);
  border-left-color: var(--accent-gold);
}
.zone-vision .info-box-label { color: var(--accent-gold); }
.zone-vision .info-box p { color: var(--text-inverse-secondary); }
.zone-vision .info-box strong { color: var(--text-inverse); }
.zone-vision .phase-link {
  color: var(--accent-gold);
  border-bottom-color: transparent;
}
.zone-vision .phase-link:hover { border-bottom-color: var(--accent-gold); }

/* ============================================================
   ZONE 2 — HEXIS (Deep emerald world)
   ============================================================ */

/* Hexis Introduction */
.zone-hexis-intro {
  background: linear-gradient(180deg, #0F2318 0%, #162B20 100%);
  padding: var(--space-3xl) 0 var(--space-xl);
  border-top: 2px solid var(--accent-gold);
}
.hexis-brand { max-width: 620px; margin: 0 auto; }
.hexis-tetra-icon { display: block; margin: 0 auto var(--space-lg); opacity: 0.9; }
.hexis-title {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--accent-gold);
  margin-bottom: var(--space-xs);
}
.hexis-greek {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-style: italic;
  color: rgba(196,154,60,0.8);
  margin-bottom: var(--space-lg);
}
.hexis-definition {
  font-size: 1.08rem;
  line-height: 1.6;
  color: rgba(248,246,242,0.75);
  max-width: 580px;
  margin: 0 auto;
}

/* Hexis Section Labels */
.hexis-section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(196,154,60,0.9);
  margin-bottom: var(--space-sm);
}

/* Six Constraints */
.zone-hexis-constraints {
  background: linear-gradient(180deg, #162B20 0%, #1A3326 50%, #162B20 100%);
  padding: var(--space-2xl) 0 var(--space-3xl);
}
.constraints-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}
.constraint-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(196,154,60,0.2);
  border-radius: 6px;
  padding: var(--space-lg);
  transition: border-color var(--ease-default), transform var(--ease-default);
}
.constraint-card:hover {
  border-color: rgba(196,154,60,0.5);
  transform: translateY(-2px);
}
.constraint-label {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}
.constraint-card h4 {
  color: var(--text-inverse);
  margin-bottom: 2px;
}
.constraint-greek {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(255,255,255,0.45);
  letter-spacing: 0.02em;
  margin-bottom: var(--space-sm);
}
.constraint-card p:last-child {
  font-size: 0.93rem;
  color: rgba(255,255,255,0.65);
  margin-bottom: 0;
  line-height: 1.5;
}
.hexis-cta {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-gold);
  border: 2px solid var(--accent-gold);
  border-radius: 4px;
  padding: 0.7rem 2rem;
  text-decoration: none;
  transition: background var(--ease-default), color var(--ease-default);
}
.hexis-cta:hover {
  background: var(--accent-gold);
  color: #0F2318;
  border-bottom-color: var(--accent-gold);
}

/* Tools section */
.zone-hexis-tools {
  background: var(--bg-primary);
  padding: var(--space-3xl) 0;
}

/* Papers section */
.zone-hexis-papers {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  padding: var(--space-3xl) 0;
}

/* Foundations */
.zone-hexis-foundations {
  background: var(--bg-primary);
  padding: var(--space-3xl) 0;
  border-bottom: 2px solid var(--accent-gold);
}
.foundations-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}
.foundation-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-top: 3px solid var(--accent-gold);
  border-radius: 4px;
  padding: var(--space-lg);
  display: block;
  text-decoration: none !important;
  border-bottom: 1px solid var(--border-light) !important;
  transition: transform var(--ease-default), box-shadow var(--ease-default);
}
.foundation-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(0,0,0,0.08);
}
.foundation-icon {
  display: block;
  margin-bottom: var(--space-sm);
}
.foundation-card h4 {
  color: var(--text-primary);
  margin-bottom: 4px;
}
.foundation-greek {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-style: italic;
  color: var(--accent-gold);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}
.foundation-card p:last-child {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0;
  line-height: 1.5;
}

/* ============================================================
   ZONE 3 — APPLICATIONS (Deep burgundy world)
   ============================================================ */
.zone-applications {
  background: linear-gradient(180deg, #2D0A0A 0%, #3A1515 50%, #2D0A0A 100%);
  padding: var(--space-3xl) 0;
  border-top: 2px solid var(--accent-gold);
}
.zone-app-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-gold);
  margin-bottom: var(--space-sm);
}
.zone-app-title {
  color: var(--text-inverse) !important;
  font-size: 2.4rem !important;
  margin-bottom: var(--space-sm);
}
.zone-app-subtitle {
  font-size: 1.05rem;
  color: rgba(248,246,242,0.65);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.55;
}
.domains-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}
.domain-card {
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(196,154,60,0.2);
  border-left: 4px solid var(--accent-gold);
  border-radius: 4px;
  padding: var(--space-lg);
  text-decoration: none !important;
  border-bottom: 1px solid rgba(196,154,60,0.2) !important;
  transition: background var(--ease-default), border-color var(--ease-default), transform var(--ease-default);
}
.domain-card:hover {
  background: rgba(255,255,255,0.07);
  border-color: rgba(196,154,60,0.5);
  transform: translateY(-2px);
}
.domain-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
}
.domain-content h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text-inverse);
  margin-bottom: 2px;
}
.domain-field {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-gold);
  margin-bottom: var(--space-sm) !important;
}
.domain-content p {
  font-size: 0.93rem;
  color: rgba(248,246,242,0.65);
  margin-bottom: var(--space-sm);
  line-height: 1.5;
}
.domain-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--accent-gold);
}

/* ============================================================
   RESPONSIVE — Zone-specific breakpoints
   ============================================================ */
@media (max-width: 900px) {
  .constraints-grid { grid-template-columns: repeat(2, 1fr); }
  .foundations-grid { grid-template-columns: repeat(2, 1fr); }
  .domains-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .hexis-title { font-size: 2.5rem; }
  .constraints-grid { grid-template-columns: 1fr; }
  .foundations-grid { grid-template-columns: 1fr; }
  .domain-card { flex-direction: column; gap: var(--space-md); }
  .zone-app-title { font-size: 1.8rem !important; }
}


/* ═══════════════════════════════════════════════════════════
   1-3-6 LAYER ARCHITECTURE
   Three visual strata: The One, The Three, The Six
   ═══════════════════════════════════════════════════════════ */

/* --- Layer Tetrahedron Marks --- */
.layer-tetra-mark {
  text-align: center;
  margin-bottom: var(--space-lg);
}
.layer-tetra-svg {
  opacity: 0.85;
  filter: drop-shadow(0 0 15px rgba(196,154,60,0.1));
  transition: opacity 0.4s ease;
  max-width: 100%;
  height: auto;
}
.layer-tetra-mark:hover .layer-tetra-svg {
  opacity: 1;
}

/* --- LAYER ONE: Hexis / Unity --- */
.layer-one {
  background: linear-gradient(175deg, #0A1A12 0%, #0F2318 40%, #132A1E 100%);
  padding: var(--space-3xl) 0 var(--space-2xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.layer-one::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(196,154,60,0.3), transparent);
}
.layer-one .hexis-brand {
  max-width: 640px;
  margin: 0 auto;
}
.hexis-tetra-icon-large {
  margin-bottom: var(--space-md);
  filter: drop-shadow(0 0 20px rgba(196,154,60,0.15));
}
.layer-one .hexis-title {
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: #C49A3C;
  margin: 0;
}
.layer-one .hexis-greek {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-style: italic;
  color: rgba(255,255,255,0.5);
  margin-top: var(--space-xs);
}
.layer-one .hexis-definition {
  font-size: 1.1rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.7);
  margin-top: var(--space-md);
}
.layer-one .hexis-cta {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  color: #C49A3C;
  text-decoration: none;
  border: 1px solid rgba(196,154,60,0.4);
  padding: var(--space-sm) var(--space-lg);
  border-radius: 3px;
  transition: all 0.3s ease;
}
.layer-one .hexis-cta:hover {
  background: rgba(196,154,60,0.1);
  border-color: #C49A3C;
}

/* --- LAYER THREE: Tripart Frame --- */
.layer-three {
  background: linear-gradient(175deg, #132A1E 0%, #1A3326 40%, #1F3D2E 100%);
  padding: var(--space-3xl) 0 var(--space-2xl);
  position: relative;
}
.layer-three::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(196,154,60,0.2), transparent);
}
.layer-three .hexis-section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(196,154,60,0.7);
  margin-bottom: var(--space-xs);
}

.tripart-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}
.tripart-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(196,154,60,0.15);
  border-top: 3px solid #C49A3C;
  border-radius: 4px;
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
  text-decoration: none;
  transition: all 0.35s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.tripart-card:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(196,154,60,0.35);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}
.tripart-icon {
  margin-bottom: var(--space-md);
  opacity: 0.9;
}
.tripart-greek {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-style: italic;
  color: rgba(196,154,60,0.7);
  margin: 0;
}
.tripart-card h3 {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 600;
  color: var(--text-inverse);
  margin: var(--space-xs) 0;
  letter-spacing: 0.05em;
}
.tripart-subtitle {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(196,154,60,0.6);
  margin: 0 0 var(--space-sm);
}
.tripart-desc {
  font-size: 0.95rem;
  line-height: 1.65;
  color: rgba(255,255,255,0.6);
  flex-grow: 1;
}
.tripart-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #C49A3C;
  margin-top: var(--space-md);
  letter-spacing: 0.03em;
}
.tripart-convergence {
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(196,154,60,0.1);
}

/* --- LAYER SIX: Exploded Tetrahedrons --- */
.layer-six {
  background: linear-gradient(175deg, #2D0A0A 0%, #3A1515 40%, #421A1A 100%);
  padding: var(--space-3xl) 0 var(--space-2xl);
  position: relative;
}
.layer-six::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(196,154,60,0.2), transparent);
}
.layer-six .zone-app-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(196,154,60,0.7);
  margin-bottom: var(--space-xs);
}
.layer-six .zone-app-title {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--text-inverse);
}
.layer-six .zone-app-subtitle {
  color: rgba(255,255,255,0.55);
  max-width: 600px;
  margin: var(--space-sm) auto 0;
  font-size: 1.05rem;
}

.exploded-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  max-width: 560px;
  margin: 0 auto;
}
.exploded-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
  padding: var(--space-md) var(--space-sm);
  border-radius: 4px;
  transition: all 0.35s ease;
  background: transparent;
}
.exploded-cell:hover {
  background: rgba(255,255,255,0.04);
  transform: translateY(-4px);
}
.exploded-cell:hover svg line[opacity="0.9"] {
  filter: drop-shadow(0 0 6px currentColor);
}
.exploded-cell svg {
  transition: transform 0.3s ease;
}
.exploded-cell:hover svg {
  transform: scale(1.05);
}
.exploded-label {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: rgba(255,255,255,0.75);
  margin-top: var(--space-xs);
  letter-spacing: 0.03em;
  transition: color 0.3s ease;
}
.exploded-cell:hover .exploded-label {
  color: #C49A3C;
}

/* --- Responsive: exploded grid --- */
@media (max-width: 900px) {
  .exploded-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
  }
}
@media (max-width: 600px) {
  .exploded-grid {
    grid-template-columns: repeat(2, 1fr);
    max-width: 340px;
  }
  .exploded-cell svg { width: 110px; height: 100px; }
  .exploded-label { font-size: 0.9rem; }
}
@media (max-width: 900px) {
  .tripart-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  .layer-six .domains-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .layer-one .hexis-title { font-size: 3rem; }
  .layer-tetra-svg { width: 220px; }
}
@media (max-width: 600px) {
  .layer-six .domains-grid {
    grid-template-columns: 1fr;
  }
  .layer-one .hexis-title { font-size: 2.5rem; }
  .tripart-card h3 { font-size: 1.6rem; }
}
/* MEDICAID ANALYSIS BANNER */
.proof-banner {
background: #0A0E13;
  border-bottom: 2px solid #C49A3C;
  padding: 0.75rem 2rem;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  z-index: 999;
}
.proof-banner-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}
.proof-banner-badge {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: #0A0E13;
  background: #C49A3C;
  padding: 0.2rem 0.6rem;
}
.proof-banner-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.05rem;
  font-weight: 600;
  color: #F8F6F2;
  text-decoration: none;
}
.proof-banner-stats {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  color: rgba(248,246,242,0.5);
}
.proof-banner-link {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.8rem;
  color: #C49A3C;
  text-decoration: none;
  margin-left: auto;
}
.proof-banner-link:hover {
  text-decoration: underline;
}
@media (max-width: 600px) {
  .proof-banner-inner { justify-content: center; text-align: center; }
  .proof-banner-link { margin-left: 0; }
.hexis-cta + .hexis-cta { margin-left: 1rem; }
}