/* BUTTERFLY EFFECT — Reader Stylesheet */
/* Lightweight, book-like typography for mobile + desktop + print/ebook conversion. */

@font-face {
  font-family: "Literata";
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url("fonts/literata-latin.woff2") format("woff2");
}

@font-face {
  font-family: "Literata";
  font-style: italic;
  font-weight: 300 700;
  font-display: swap;
  src: url("fonts/literata-latin-italic.woff2") format("woff2");
}

@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url("fonts/space-grotesk-latin.woff2") format("woff2");
}

:root {
  color-scheme: light dark;

  --bg: #f5efe4;
  --bg-top: #fbf7f0;
  --text: #17120d;
  --text-muted: rgba(23, 18, 13, 0.62);
  --accent: #155e6b;
  --accent-light: #2a8aa2;
  --accent-warm: #a85a2a;
  --glow-cool: rgba(21, 94, 107, 0.10);
  --glow-warm: rgba(168, 90, 42, 0.08);
  --border: rgba(23, 19, 14, 0.14);
  --nav-bg: rgba(252, 248, 241, 0.96);
  --scene-break: rgba(23, 19, 14, 0.35);

  /* Prefer high-quality book serifs where available; fall back to system serif. */
  --font-body: "Literata", "Iowan Old Style", "Charter", "Palatino Linotype",
    Palatino, "Book Antiqua", "Noto Serif", "DejaVu Serif", serif;
  --font-ui: "Space Grotesk", "Avenir Next", Avenir, "Gill Sans",
    "Trebuchet MS", sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Monaco, "Cascadia Mono",
    "Segoe UI Mono", "Roboto Mono", "Noto Sans Mono", "DejaVu Sans Mono",
    monospace;

  --measure: 72ch;
  --line-height: 1.68;
  --content-pad: 1.25rem;
  --paragraph-indent: 1.5em;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141416;
    --bg-top: #1a1a1d;
    --text: #e7dfd6;
    --text-muted: rgba(231, 223, 214, 0.68);
    --accent: #7cc2d0;
    --accent-light: #a1d9e4;
    --accent-warm: #d28b5f;
    --glow-cool: rgba(124, 194, 208, 0.10);
    --glow-warm: rgba(210, 139, 95, 0.08);
    --border: rgba(231, 223, 214, 0.16);
    --nav-bg: rgba(26, 26, 29, 0.96);
    --scene-break: rgba(231, 223, 214, 0.35);
  }
}

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

html {
  font-size: clamp(16px, 1.2vw + 12px, 20px);
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  font-family: var(--font-body);
  background:
    radial-gradient(900px 600px at 18% 6%, var(--glow-cool), transparent 60%),
    radial-gradient(1000px 700px at 82% 18%, var(--glow-warm), transparent 62%),
    linear-gradient(180deg, var(--bg-top), var(--bg));
  color: var(--text);
  line-height: var(--line-height);
  font-optical-sizing: auto;
  font-kerning: normal;
  font-variant-ligatures: common-ligatures contextual;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent-light);
}

/* Navigation */
.chapter-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem var(--content-pad);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-ui);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  position: sticky;
  top: 0;
  z-index: 10;
}

.chapter-nav.bottom {
  position: static;
  border-bottom: none;
  border-top: 1px solid var(--border);
  margin-top: 4rem;
}

.chapter-nav a {
  text-decoration: none;
  padding: 0.25rem 0;
}

.chapter-nav a:hover {
  text-decoration: underline;
}

/* Header */
header {
  text-align: center;
  padding: 2.75rem var(--content-pad) 1.5rem;
  max-width: var(--measure);
  margin: 0 auto;
}

.chapter-sigil {
  display: flex;
  justify-content: center;
  margin-bottom: 1.25rem;
  color: var(--accent);
}

.chapter-sigil .sigil {
  width: 56px;
  height: 56px;
  opacity: 0.88;
}

.arc-label {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

header h1 {
  font-family: var(--font-body);
  font-size: 1.9rem;
  font-weight: 500;
  line-height: 1.22;
  margin-bottom: 0.5rem;
}

.chapter-title {
  font-style: italic;
  font-weight: 450;
}

.chapter-meta {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* Chapter body */
.chapter-body {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--content-pad) 4rem;
}

.chapter-body p {
  margin: 0;
  text-indent: var(--paragraph-indent);
  text-align: justify;
  text-justify: inter-word;
  -webkit-hyphens: auto;
  -ms-hyphens: auto;
  hyphens: auto;
  overflow-wrap: break-word;
}

.chapter-body p + p {
  margin-top: 0.12em;
}

.chapter-body p:first-of-type {
  text-indent: 0;
}

.chapter-body p:first-of-type::first-letter {
  font-size: 3.1em;
  float: left;
  line-height: 0.86;
  padding-right: 0.07em;
  padding-top: 0.05em;
  font-weight: 500;
  color: var(--text);
}

/* Scene breaks */
hr.scene-break {
  border: none;
  text-align: center;
  margin: 2.5rem 0;
}

hr.scene-break::before {
  content: '· · ·';
  color: var(--scene-break);
  font-size: 1.2rem;
  letter-spacing: 0.5em;
}

blockquote {
  margin: 1.75rem 0;
  padding: 0.25rem 0 0.25rem 1rem;
  border-left: 2px solid var(--border);
  color: var(--text-muted);
}

blockquote p {
  text-indent: 0;
  text-align: left;
  -webkit-hyphens: none;
  hyphens: none;
}

/* Dialogue and emphasis */
em {
  font-style: italic;
}

strong {
  font-weight: 600;
}

/* Satya language words */
.satya {
  font-style: italic;
  color: var(--accent);
}

/* VEDA interstitial sections */
.veda-voice {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
  padding: 1.5rem;
  margin: 2rem 0;
  border-left: 2px solid var(--accent);
  background: var(--nav-bg);
}

/* Primary documents (in-world excerpts) */
.primary-document {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 1.5rem;
  margin: 2rem 0;
  border: 1px solid var(--border);
  background: var(--nav-bg);
}

.primary-document .doc-header {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

img,
video {
  max-width: 100%;
  height: auto;
}

/* Index page */
.toc-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem var(--content-pad);
  max-width: var(--measure);
  margin: 0 auto;
}

.toc-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.42rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--nav-bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.toc-pill:hover {
  background: color-mix(in srgb, var(--nav-bg) 78%, #fff 22%);
  border-color: color-mix(in srgb, var(--border) 55%, var(--accent) 45%);
  color: var(--accent);
}

.index-header {
  text-align: center;
  padding: 3.25rem var(--content-pad) 2rem;
}

.index-header h1 {
  font-family: var(--font-body);
  font-size: 2.65rem;
  font-weight: 550;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
}

.index-header .subtitle {
  font-style: italic;
  color: var(--text-muted);
}

.arc-group {
  max-width: var(--measure);
  margin: 2rem auto;
  padding: 0 var(--content-pad);
}

.arc-group h2 {
  font-family: var(--font-ui);
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}

.chapter-link {
  display: grid;
  grid-template-columns: 42px 3.2em 1fr;
  gap: 0.75rem;
  align-items: center;
  padding: 0.65rem 0.25rem;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid rgba(23, 18, 13, 0.06);
  border-radius: 10px;
}

.chapter-link:hover {
  color: var(--accent);
  background: rgba(21, 94, 107, 0.06);
}

.chapter-link .chapter-sigil {
  margin: 0;
  justify-content: flex-start;
  color: var(--text-muted);
}

.chapter-link .sigil {
  width: 34px;
  height: 34px;
  opacity: 0.82;
}

.chapter-number {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.chapter-text {
  display: block;
}

.chapter-text .chapter-title {
  display: block;
  font-family: var(--font-body);
  font-size: 1.02rem;
  line-height: 1.25;
}

.chapter-text .chapter-sub {
  display: block;
  font-family: var(--font-ui);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  color: var(--text-muted);
  margin-top: 0.1rem;
}

/* Responsive */
@media (max-width: 600px) {
  :root {
    --content-pad: 1rem;
    --paragraph-indent: 1.25em;
  }

  header {
    padding: 2.25rem var(--content-pad) 1.25rem;
  }

  .chapter-sigil .sigil {
    width: 50px;
    height: 50px;
  }

  header h1 {
    font-size: 1.55rem;
  }

  .chapter-body {
    padding: 0 var(--content-pad) 3rem;
  }

  /* Justification on narrow screens can look gappy; hyphenation helps, but keep it conservative. */
  /* Drop caps fight for space on small screens. */
  .chapter-body p:first-of-type::first-letter {
    float: none;
    font-size: 1em;
    line-height: inherit;
    padding: 0;
    font-weight: inherit;
  }

  .chapter-nav {
    position: static;
  }

  .chapter-link {
    grid-template-columns: 36px 2.8em 1fr;
    gap: 0.6rem;
    padding: 0.6rem 0.2rem;
    border-radius: 8px;
  }

  .chapter-link .sigil {
    width: 28px;
    height: 28px;
  }
}

@media (min-width: 1200px) {
  :root {
    --content-pad: 1.5rem;
  }
}

/* Reading progress bar */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: var(--accent);
  z-index: 100;
  transition: width 0.1s ease;
}

@media print {
  body {
    background: #fff;
    color: #000;
  }

  .chapter-nav {
    display: none;
  }

  a {
    color: #000;
    text-decoration: none;
  }
}