/* ===========================================
   ARO Easter 2026 — Design System
   "Sphere and Parchment"

   The aesthetic IS the framework:
   - Void black = native geometry (the sphere's interior)
   - Parchment = chord-space projection (what arrives on the plane)
   - Ochre-gold = the arc's warmth (the curvature that carries care)
   - Cyan = the living geometry (interactive, animated, alive)
   =========================================== */

:root {
  /* Core Palette */
  --void: #0A0A0B;
  --void-surface: #111113;
  --void-raised: #1A1A1D;
  --parchment: #F5E6C8;
  --parchment-dim: rgba(245, 230, 200, 0.7);
  --parchment-faint: rgba(245, 230, 200, 0.4);
  --ochre: #C8873A;
  --ochre-dim: rgba(200, 135, 58, 0.4);
  --ochre-glow: rgba(200, 135, 58, 0.15);
  --cyan: #00D4FF;
  --cyan-dim: rgba(0, 212, 255, 0.4);
  --cyan-glow: rgba(0, 212, 255, 0.1);
  --red-chord: #FF4444;

  /* Typography */
  --font-body: 'Georgia', 'Times New Roman', serif;
  --font-mono: 'SF Mono', 'Consolas', 'Liberation Mono', monospace;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-2xl: 80px;

  /* Layout */
  --content-max: 800px;
  --page-max: 1000px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.6s ease;
}

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

/* === Base === */
html { scroll-behavior: smooth; }

body {
  background-color: var(--void);
  color: var(--parchment);
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.75;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* Grain texture overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 1000;
  opacity: 0.3;
}

/* === Typography === */
h1, h2, h3, h4 { font-weight: normal; line-height: 1.3; }

h1 {
  font-size: 2.4em;
  color: var(--ochre);
  letter-spacing: 0.08em;
}

h2 {
  font-size: 1.6em;
  color: var(--ochre);
  letter-spacing: 0.04em;
  margin-bottom: var(--space-md);
}

h3 {
  font-size: 1.2em;
  color: var(--parchment);
  margin-bottom: var(--space-sm);
}

p { margin-bottom: var(--space-md); }

a {
  color: var(--ochre);
  text-decoration: none;
  border-bottom: 1px solid var(--ochre-dim);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}
a:hover {
  border-color: var(--ochre);
  color: var(--parchment);
}

blockquote {
  border-left: 3px solid var(--ochre-dim);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
  background: var(--ochre-glow);
  font-style: italic;
  color: var(--parchment-dim);
}

blockquote em, blockquote strong {
  color: var(--parchment);
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--void-raised);
  padding: 2px 6px;
  border-radius: 3px;
}

/* === Site Header / Navigation === */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 11, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--ochre-dim);
  padding: var(--space-md) var(--space-lg);
}

.nav-inner {
  max-width: var(--page-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-size: 1.1em;
  color: var(--ochre);
  letter-spacing: 0.1em;
  border: none;
  text-transform: uppercase;
  font-variant: small-caps;
}
.nav-brand:hover { color: var(--parchment); border: none; }

.nav-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links a {
  font-size: 0.85em;
  color: var(--parchment-dim);
  border: none;
  letter-spacing: 0.05em;
  transition: color var(--transition-fast);
}
.nav-links a:hover { color: var(--ochre); }
.nav-links a.active { color: var(--ochre); }

/* Mobile hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--parchment);
  font-size: 1.5em;
  cursor: pointer;
  padding: var(--space-xs);
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 10, 11, 0.98);
    padding: var(--space-md) var(--space-lg);
    gap: var(--space-md);
    border-bottom: 1px solid var(--ochre-dim);
  }
  .nav-links.open { display: flex; }
}

/* === Page Sections === */
.page-header {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg) var(--space-xl);
  max-width: var(--page-max);
  margin: 0 auto;
}

.page-header .subtitle {
  font-size: 1.15em;
  color: var(--parchment-dim);
  font-style: italic;
  max-width: 700px;
  margin: var(--space-md) auto 0;
  line-height: 1.6;
}

.page-header .date-line {
  font-size: 0.9em;
  color: var(--parchment-faint);
  margin-top: var(--space-sm);
}

.content-section {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-xl);
}

.wide-section {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-xl);
}

/* Divider */
.section-divider {
  max-width: var(--content-max);
  margin: var(--space-xl) auto;
  border: none;
  border-top: 1px solid var(--ochre-dim);
}

/* === Animation Canvas Container === */
.animation-container {
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto var(--space-xl);
  aspect-ratio: 16 / 9;
  background: var(--void);
  border: 1px solid var(--ochre-dim);
  border-radius: 4px;
  position: relative;
  overflow: hidden;
}

.animation-container canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.animation-label {
  position: absolute;
  bottom: var(--space-md);
  right: var(--space-md);
  font-size: 0.75em;
  color: var(--parchment-faint);
  font-family: var(--font-mono);
}

/* === Concept Quote === */
.concept-quote {
  max-width: var(--content-max);
  margin: 0 auto var(--space-xl);
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
  font-size: 1.15em;
  line-height: 1.8;
  color: var(--parchment-dim);
  border-top: 1px solid var(--ochre-dim);
  border-bottom: 1px solid var(--ochre-dim);
}

/* === "In Other Words" Expandable === */
.in-other-words {
  max-width: var(--content-max);
  margin: var(--space-lg) auto;
  border: 1px solid var(--cyan-dim);
  border-radius: 4px;
  overflow: visible;
}

.iow-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  background: var(--cyan-glow);
  border: none;
  color: var(--cyan);
  font-family: var(--font-body);
  font-size: 0.95em;
  cursor: pointer;
  text-align: left;
  transition: background var(--transition-fast);
}
.iow-toggle:hover { background: rgba(0, 212, 255, 0.15); }

.iow-toggle .arrow {
  transition: transform var(--transition-fast);
  font-size: 0.8em;
}
.iow-toggle.open .arrow { transform: rotate(90deg); }

.iow-content {
  display: none;
  padding: var(--space-md) var(--space-lg) var(--space-lg);
  color: var(--parchment-dim);
  line-height: 1.8;
  font-size: 1em;
  background: rgba(0, 212, 255, 0.03);
}
.iow-content.open { display: block; }

/* === Progressive Disclosure (Insights) === */
.ruling-card,
.insight-card {
  border: 1px solid var(--ochre-dim);
  border-radius: 4px;
  margin-bottom: var(--space-md);
  overflow: hidden;
}

.ruling-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--void-surface);
  cursor: pointer;
  transition: background var(--transition-fast);
}
.ruling-header:hover { background: var(--void-raised); }

.ruling-number {
  font-size: 1.4em;
  color: var(--ochre);
  font-weight: normal;
  min-width: 2em;
  text-align: center;
  line-height: 1;
  padding-top: 4px;
}

.ruling-title {
  flex: 1;
}

.ruling-title h3 {
  margin: 0;
  font-size: 1.05em;
  color: var(--parchment);
}

.ruling-oneliner {
  font-size: 0.9em;
  color: var(--parchment-dim);
  margin-top: var(--space-xs);
  font-style: italic;
}

.ruling-expand-icon {
  color: var(--ochre-dim);
  font-size: 1.2em;
  transition: transform var(--transition-fast);
  padding-top: 4px;
}
.ruling-header.open .ruling-expand-icon { transform: rotate(90deg); }

.ruling-body {
  display: none;
  padding: var(--space-lg);
  border-top: 1px solid rgba(200, 135, 58, 0.15);
}
.ruling-body.open { display: block; }

.ruling-section {
  margin-bottom: var(--space-lg);
}

.ruling-section-label {
  font-size: 0.8em;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ochre);
  margin-bottom: var(--space-sm);
}

/* === Vocabulary Popup === */
.vocab-term {
  border-bottom: 1px dashed var(--cyan-dim);
  cursor: help;
  position: relative;
  color: var(--parchment);
}

.vocab-popup {
  display: none;
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--void-raised);
  border: 1px solid var(--cyan-dim);
  border-radius: 4px;
  padding: var(--space-sm) var(--space-md);
  font-size: 0.85em;
  color: var(--parchment-dim);
  line-height: 1.5;
  max-width: 300px;
  min-width: 200px;
  z-index: 1001;
  pointer-events: none;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}
.vocab-popup::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--cyan-dim);
}

.vocab-term:hover .vocab-popup,
.vocab-term:focus .vocab-popup {
  display: block;
}

/* === Entry Cards (Landing Page) === */
.entry-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.entry-card {
  background: var(--void-surface);
  border: 1px solid var(--ochre-dim);
  border-radius: 4px;
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
  transition: border-color var(--transition-normal), background var(--transition-normal);
  text-decoration: none;
  display: block;
}
.entry-card:hover {
  border-color: var(--ochre);
  background: var(--void-raised);
}

.entry-card h3 {
  color: var(--ochre);
  font-size: 1.2em;
  margin-bottom: var(--space-sm);
}

.entry-card p {
  color: var(--parchment-dim);
  font-size: 0.95em;
  margin: 0;
}

/* === Pi O'Clock Callout === */
.pi-callout {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  margin: var(--space-xl) 0;
}

.pi-number {
  font-size: 4em;
  font-family: var(--font-mono);
  color: var(--ochre);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.pi-label {
  font-size: 1.1em;
  color: var(--parchment-dim);
  font-style: italic;
}

/* === Two-Column Side-by-Side === */
.side-by-side {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

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

.side-panel {
  padding: var(--space-lg);
  border: 1px solid var(--ochre-dim);
  border-radius: 4px;
  background: var(--void-surface);
}

.side-panel h3 {
  color: var(--ochre);
  margin-bottom: var(--space-md);
}

/* === Friction Point Map === */
.fp-map {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-md);
  margin: var(--space-xl) 0;
}

.fp-item {
  padding: var(--space-md);
  border: 1px solid var(--ochre-dim);
  border-radius: 4px;
  text-align: center;
  background: var(--void-surface);
}

.fp-number {
  font-size: 0.8em;
  color: var(--ochre);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.fp-name {
  font-size: 0.95em;
  margin: var(--space-xs) 0;
}

.fp-ruling {
  font-size: 0.8em;
  color: var(--parchment-faint);
}

/* === Witness Signatures === */
.witness-block {
  margin: var(--space-xl) 0;
  padding: var(--space-lg);
  border-left: 3px solid var(--ochre);
}

.witness-name {
  font-size: 1.1em;
  color: var(--ochre);
  margin-bottom: var(--space-sm);
}

.witness-role {
  font-size: 0.85em;
  color: var(--parchment-faint);
  margin-bottom: var(--space-md);
}

/* === Footer === */
.site-footer {
  max-width: var(--page-max);
  margin: var(--space-2xl) auto 0;
  padding: var(--space-xl) var(--space-lg);
  border-top: 1px solid var(--ochre-dim);
  text-align: center;
  font-size: 0.85em;
  color: var(--parchment-faint);
}

.site-footer a {
  color: var(--ochre);
  font-size: 1em;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

/* === Margin Notes (Desktop) === */
.margin-note {
  display: none;
}

@media (min-width: 1200px) {
  .content-section { position: relative; }
  .margin-note {
    display: block;
    position: absolute;
    right: -220px;
    width: 180px;
    font-size: 0.8em;
    color: var(--parchment-faint);
    line-height: 1.5;
    border-left: 1px solid var(--ochre-dim);
    padding-left: var(--space-md);
  }
}

/* === Utility === */
.text-center { text-align: center; }
.text-ochre { color: var(--ochre); }
.text-cyan { color: var(--cyan); }
.text-dim { color: var(--parchment-dim); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

/* === Concept Page Template === */
.concept-nav {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  padding: var(--space-lg);
  flex-wrap: wrap;
}

.concept-nav a {
  font-size: 0.85em;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--ochre-dim);
  border-radius: 4px;
  color: var(--parchment-dim);
  transition: all var(--transition-fast);
}
.concept-nav a:hover {
  border-color: var(--ochre);
  background: var(--ochre-glow);
  color: var(--ochre);
}
.concept-nav a.current {
  border-color: var(--ochre);
  background: var(--ochre-glow);
  color: var(--ochre);
}