/* ==========================================================================
   Lotus Oak Web — Unified Design System
   VERSION: 1.0.0
   MIGRATED FROM: l0ci/website, lotusoak-website, companies/foundation

   Shared design tokens + domain-specific styles.
   Ensō navigation CSS is inlined here (was shared/css/enso-c-pure.css).
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design Tokens — Lotus Oak Brand Style Guide v2.0.1
   -------------------------------------------------------------------------- */

:root {
  /* Colors - Lotus Oak Unified Palette */
  --color-bg: #FAF9F6;
  --color-text: #2D3436;
  --color-text-muted: #5D6D7E;
  --color-accent: #74A892;
  --color-border: #E5E3DE;
  --color-gold: #B8860B;

  /* Typography */
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Type Scale (1.25 ratio) */
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.563rem;
  --font-size-2xl: 1.953rem;
  --font-size-3xl: 2.441rem;

  /* Line Heights */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.6;

  /* Letter Spacing */
  --letter-spacing-body: 0.03em;

  /* Spacing Scale (8px base) */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-6: 3rem;
  --space-8: 4rem;
  --space-12: 6rem;
  --space-16: 8rem;

  /* Viewport-Aware Spacing */
  --space-section-pad: clamp(2rem, 8vh, 5rem);
  --space-heading-gap: clamp(1rem, 3vh, 2rem);

  /* Layout */
  --nav-width: 5rem;
  --content-max-width: 38rem;
  --content-padding: var(--space-6);

  /* Animation */
  --transition-base: 300ms ease;
  --transition-slow: 600ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Ensō Scroll Drum Variables (from Fact Finder Issue #716) */
  --enso-gap: 2.5rem;
  --enso-size: 2.75rem;
  --enso-number-size: 2rem;
  --enso-center-offset: calc((var(--enso-size) - var(--enso-number-size)) / 2);
  --enso-item-spacing: calc(var(--enso-number-size) + var(--enso-gap));
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */

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

html {
  scroll-behavior: smooth;
  /* proximity (not mandatory) — allows natural scrolling through long content
     while still snapping at section boundaries. Matches Fact Finder pattern. */
  scroll-snap-type: y proximity;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  letter-spacing: var(--letter-spacing-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------------------------------------
   Skip Link (Accessibility)
   -------------------------------------------------------------------------- */

.skip-link {
  position: absolute;
  top: -3rem;
  left: var(--space-2);
  padding: var(--space-1) var(--space-2);
  background: var(--color-text);
  color: var(--color-bg);
  font-size: var(--font-size-sm);
  text-decoration: none;
  border-radius: 0 0 4px 4px;
  z-index: 1000;
  transition: top var(--transition-base);
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Ensō Scroll Drum Navigation (from Fact Finder Issue #716)

   Philosophy: The Ensō is a FIXED viewing window at viewport center.
   Section numbers scroll up/down like paper on a scroll drum.
   Distance-based opacity creates depth and focus.

   Sibling of: l0xi/fact_finder_elixir/assets/css/app.css (lines 157-377)
   -------------------------------------------------------------------------- */

.enso-nav-scroll {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  width: var(--nav-width);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  background: var(--color-bg);
  border-right: 1px solid var(--color-border);
  z-index: 100;
  overflow: hidden;
}

/* The Ensō Ring — FIXED viewing window (stays in place) */
.enso-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: var(--enso-size);
  height: var(--enso-size);
  pointer-events: none;
  z-index: 2;
  opacity: 0;
  animation: enso-fade-in 800ms ease-out 300ms forwards;
}

@keyframes enso-fade-in {
  to { opacity: 1; }
}

/* Conic-gradient brush-stroke effect with gap at 12 o'clock */
.enso-ring::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(
    from 225deg,
    transparent 0deg,
    var(--color-text-muted) 30deg,
    var(--color-text-muted) 280deg,
    transparent 315deg,
    transparent 360deg
  );
  -webkit-mask: radial-gradient(circle at center, transparent 55%, black 55%, black 70%, transparent 70%);
  mask: radial-gradient(circle at center, transparent 55%, black 55%, black 70%, transparent 70%);
  opacity: 0.85;
}

/* The scrolling number strip (MOVES while Ensō stays fixed) */
.number-strip {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--enso-gap);
  transition: transform var(--transition-slow);
  z-index: 1;
  /* Offset so first item starts at center */
  padding-top: calc(50vh - var(--enso-number-size) / 2);
  padding-bottom: calc(50vh - var(--enso-number-size) / 2);
}

/* Section number links */
.section-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--enso-number-size);
  height: var(--enso-number-size);
  font-family: var(--font-serif);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: 50%;
  transition: all var(--transition-base);
  opacity: 0.3;
}

/* Current section — fully visible */
.section-num.current {
  color: var(--color-text);
  font-weight: 600;
  opacity: 1;
}

/* Distance-based opacity fading */
.section-num[data-distance="1"] { opacity: 0.6; }
.section-num[data-distance="2"] { opacity: 0.4; }
.section-num:not(.current):not([data-distance="1"]):not([data-distance="2"]) { opacity: 0.2; }

/* Hover — bring into focus */
.section-num:hover:not(.current) {
  opacity: 0.8;
  color: var(--color-text);
}

/* Focus state for accessibility */
.section-num:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Section counter at bottom */
.enso-section-count {
  position: absolute;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-serif);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-align: center;
}

.current-of-total {
  font-variant-numeric: tabular-nums;
}

/* Fallback for browsers without conic-gradient */
@supports not (background: conic-gradient(red, blue)) {
  .enso-ring::before {
    background: none;
    border: 2px solid var(--color-text-muted);
    -webkit-mask: none;
    mask: none;
  }
}

/* --------------------------------------------------------------------------
   Main Content
   -------------------------------------------------------------------------- */

main {
  margin-left: var(--nav-width);
  padding: 0 var(--content-padding);
  padding-bottom: var(--space-8);
  max-width: var(--content-max-width);
}

/* Site Header */
.site-header {
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  scroll-snap-align: start;
  padding: var(--space-section-pad) 0;
  border-bottom: 1px solid var(--color-border);
}

.site-header h1 {
  font-family: var(--font-serif);
  font-size: var(--font-size-3xl);
  font-weight: 400;
  margin: 0 0 var(--space-2);
  letter-spacing: 0.25em;
  text-transform: uppercase;
}

.site-tagline {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  margin: 0;
}

/* --------------------------------------------------------------------------
   L0CI Chapters
   -------------------------------------------------------------------------- */

.chapters { display: flex; flex-direction: column; }

.chapter {
  position: relative;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  scroll-snap-align: start;
  padding: var(--space-section-pad) 0;
}

.js .chapter {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.js .chapter.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered fadeInUp for chapter child elements (Fact Finder pattern) */
.js .chapter.visible .chapter-number {
  animation: fadeInUp 600ms ease forwards;
  animation-delay: 100ms;
  opacity: 0;
}

.js .chapter.visible .chapter-content {
  animation: fadeInUp 600ms ease forwards;
  animation-delay: 200ms;
  opacity: 0;
}

.js .chapter.visible .chapter-footer {
  animation: fadeInUp 600ms ease forwards;
  animation-delay: 300ms;
  opacity: 0;
}

.chapter-number {
  font-family: var(--font-serif);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
  letter-spacing: 0.1em;
}

.chapter h2 {
  font-family: var(--font-serif);
  font-size: var(--font-size-2xl);
  font-weight: 400;
  margin: 0 0 var(--space-heading-gap);
  line-height: var(--line-height-tight);
}

.chapter-content {
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
}

.chapter-content p { margin: 0 0 var(--space-3); }
.chapter-content p:last-child { margin-bottom: 0; }

.chapter-content blockquote {
  margin: var(--space-6) 0;
  padding: 0;
  border: none;
  font-family: var(--font-serif);
  font-size: var(--font-size-lg);
  font-style: italic;
  color: var(--color-text);
  line-height: var(--line-height-relaxed);
}

.chapter-content blockquote p { margin: 0; }

/* References Section */
.references {
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  scroll-snap-align: start;
  padding: var(--space-section-pad) 0;
  border-top: 1px solid var(--color-border);
}

.references h2 {
  font-family: var(--font-serif);
  font-size: var(--font-size-xl);
  font-weight: 400;
  margin: 0 0 var(--space-6);
  letter-spacing: 0.1em;
}

.references-content {
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-muted);
}

.references-content ul { list-style: none; padding: 0; margin: var(--space-4) 0; }
.references-content li { margin-bottom: var(--space-2); font-style: italic; }

/* --------------------------------------------------------------------------
   Holding Company — Scroll Snap Pages
   -------------------------------------------------------------------------- */

.page-section {
  scroll-snap-align: start;
  min-height: 100vh;
  padding: var(--space-8) var(--space-4);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.js .page-section {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.js .page-section.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered fadeInUp for page section child elements (Fact Finder pattern) */
.js .page-section.visible .page-content {
  animation: fadeInUp 600ms ease forwards;
  animation-delay: 200ms;
  opacity: 0;
}

.js .page-section.visible .coming-soon {
  animation: fadeInUp 600ms ease forwards;
  animation-delay: 300ms;
  opacity: 0;
}

.hero-section { min-height: 100vh; }
.hero-content { max-width: 600px; }

.site-title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 400;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  margin: 0 0 var(--space-2);
}

.page-content {
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.page-content p { margin: 0 0 var(--space-3); }
.page-content p:last-child { margin-bottom: 0; }

.coming-soon {
  display: inline-block;
  padding: 0.75rem 2rem;
  border: 1px solid var(--color-accent);
  border-radius: 2px;
}

.coming-soon .label {
  font-size: var(--font-size-sm);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   fadeInUp Keyframe (Fact Finder staggered animation pattern)
   -------------------------------------------------------------------------- */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.site-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-2) var(--space-4);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  background-color: var(--color-bg);
  letter-spacing: 0.05em;
  z-index: 50;
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 768px) {
  :root {
    --nav-width: 3rem;
    --content-padding: var(--space-3);
    --enso-gap: 2.25rem;
    --enso-size: 2rem;
    --enso-number-size: 1.5rem;
    --enso-center-offset: calc((var(--enso-size) - var(--enso-number-size)) / 2);
  }

  .site-header h1 { font-size: var(--font-size-2xl); }
  .chapter h2 { font-size: var(--font-size-xl); }
  .site-title { letter-spacing: 0.15em; }
}

/* --------------------------------------------------------------------------
   Print
   -------------------------------------------------------------------------- */

@media print {
  nav, .skip-link, .site-footer, #side-nav { display: none; }
  main { margin-left: 0; max-width: 100%; }
  .chapter { page-break-inside: avoid; }
  .js .chapter { opacity: 1; transform: none; }
}

/* --------------------------------------------------------------------------
   Reduced Motion Accessibility
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
    scroll-snap-type: none;
  }

  .js .chapter,
  .js .page-section {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .js .chapter.visible .chapter-number,
  .js .chapter.visible .chapter-content,
  .js .chapter.visible .chapter-footer,
  .js .page-section.visible .page-content,
  .js .page-section.visible .coming-soon {
    animation: none;
    opacity: 1;
    transform: none;
  }

  .enso-nav-scroll,
  .enso-ring {
    transition: none;
    animation: none;
    opacity: 1;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }

  /* Nuclear approach (Fact Finder pattern): catch ALL animations globally.
     Uses 0.01ms (not 0s) to ensure animationend events still fire. */
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}