:root {
  --bg: #07090c;
  --bg-soft: #0d1117;
  --bg-elev: #141a23;
  --grid: rgba(180, 200, 220, 0.04);
  --grid-strong: rgba(180, 200, 220, 0.10);
  --ink: #e8e4dc;
  --ink-soft: #9aa2ad;
  --ink-mute: #5a6270;
  --cold: #5cb8b3;
  --cold-glow: rgba(92, 184, 179, 0.18);
  --cold-glow-strong: rgba(92, 184, 179, 0.32);
  --warm: #e0a85f;
  --warm-glow: rgba(224, 168, 95, 0.14);
  --accent-flash: #d4c97a;
  --accent-pivot: #b86e8f;
  --rule: rgba(180, 200, 220, 0.08);
  --rule-strong: rgba(180, 200, 220, 0.20);

  /* ltts widget — adapt to Узловая theme */
  --ltts-bg: #141a23;
  --ltts-fg: #e8e4dc;
  --ltts-rule: rgba(180, 200, 220, 0.20);
  --ltts-accent: #5cb8b3;
  --ltts-accent-hover: #7ec9c4;
  --ltts-shadow: 0 4px 24px rgba(92, 184, 179, 0.18);
  --ltts-mute: #5a6270;
}

.topbar-tools { display: flex; align-items: center; gap: 12px; }
.topbar-tools .ltts-mount-slot { display: inline-flex; align-items: center; }

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: 'Newsreader', Georgia, serif;
  font-size: 18px;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 80px 80px;
  animation: grid-drift 240s linear infinite;
  pointer-events: none;
}
@keyframes grid-drift {
  from { transform: translate(0, 0); }
  to { transform: translate(80px, 80px); }
}

.bg-shapes {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}
.bg-shape {
  position: absolute;
  opacity: 0.06;
  animation: shape-float 90s linear infinite;
}
@keyframes shape-float {
  0%   { transform: translate(0, 0) rotate(0deg); }
  50%  { transform: translate(-30px, 20px) rotate(180deg); }
  100% { transform: translate(0, 0) rotate(360deg); }
}

.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 28px;
  background: rgba(7, 9, 12, 0.78);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.topbar a { color: var(--ink); text-decoration: none; }
.topbar .brand {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.15em;
  color: var(--cold);
}
.topbar .home {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  border: 1px solid var(--rule);
  padding: 6px 14px;
  border-radius: 2px;
  transition: all .25s;
}
.topbar .home:hover {
  color: var(--cold);
  border-color: var(--cold);
  box-shadow: 0 0 18px var(--cold-glow);
}

.progress {
  position: fixed;
  top: 56px; left: 0; right: 0;
  height: 1px;
  background: var(--rule);
  z-index: 99;
}
.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--cold), var(--warm));
  transition: width .15s linear;
  box-shadow: 0 0 10px var(--cold-glow);
}

/* ==== INDEX ==== */
.hero {
  padding: 130px 6vw 60px;
  text-align: center;
  position: relative;
  opacity: 0;
  animation: fade-up 1.2s ease-out forwards;
}
@keyframes fade-up {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: none; }
}

.hero h1 {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(38px, 7vw, 78px);
  font-weight: 700;
  letter-spacing: 0.04em;
  background: linear-gradient(180deg, var(--ink) 0%, var(--cold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 18px;
  line-height: 1.1;
}
.hero .tagline {
  font-family: 'Newsreader', serif;
  font-style: italic;
  font-size: clamp(15px, 2vw, 20px);
  color: var(--ink-soft);
  max-width: 640px;
  margin: 0 auto;
}
.hero .meta {
  margin-top: 36px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-mute);
  text-transform: uppercase;
}

.intro-block {
  max-width: 720px;
  margin: 60px auto 80px;
  padding: 0 24px;
  font-size: 17px;
  color: var(--ink-soft);
  line-height: 1.85;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .9s ease-out, transform .9s ease-out;
}
.intro-block.is-visible { opacity: 1; transform: none; }
.intro-block p { margin-bottom: 18px; }
.intro-block em { color: var(--ink); font-style: italic; }

.chapter-graph {
  max-width: 1200px;
  margin: 40px auto 100px;
  padding: 0 4vw;
}

.part-divider {
  display: flex;
  align-items: center;
  gap: 24px;
  margin: 60px 0 36px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  letter-spacing: 0.25em;
  color: var(--cold);
  text-transform: uppercase;
  opacity: 0;
  transform: translateX(-12px);
  transition: opacity .8s ease-out, transform .8s ease-out;
}
.part-divider.is-visible { opacity: 1; transform: none; }
.part-divider::before { content: ""; flex: 0 0 60px; height: 1px; background: var(--cold); }
.part-divider::after { content: ""; flex: 1; height: 1px; background: var(--rule); }
.part-divider .part-num { opacity: 0.5; }

.chapter-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}

.chapter-node {
  position: relative;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  text-decoration: none;
  color: var(--ink);
  transition: all .35s cubic-bezier(.2,.8,.2,1);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(20px);
}
.chapter-node.is-visible {
  opacity: 1;
  transform: none;
  transition: opacity .7s ease-out, transform .7s ease-out;
}

.chapter-node .cover {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  background: var(--bg-elev);
  overflow: hidden;
}
.chapter-node .cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.3) brightness(0.85) contrast(1.05);
  transition: filter .5s, transform .8s cubic-bezier(.2,.8,.2,1);
}
.chapter-node .cover.no-img {
  display: flex;
  align-items: center;
  justify-content: center;
}
.chapter-node .cover .glyph {
  width: 50%; height: 50%;
  opacity: 0.55;
}
.chapter-node:hover .cover img {
  filter: grayscale(0) brightness(1) contrast(1.1);
  transform: scale(1.04);
}

.chapter-node .body {
  padding: 18px 18px 16px;
}
.chapter-node .num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-mute);
  margin-bottom: 6px;
}
.chapter-node[data-kind="flashback"] .num { color: var(--accent-flash); }
.chapter-node[data-kind="pivot"] .num { color: var(--accent-pivot); }

.chapter-node .title {
  font-family: 'Newsreader', serif;
  font-size: 19px;
  line-height: 1.3;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 8px;
}
.chapter-node .kind-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.25em;
  color: var(--ink-mute);
  text-transform: uppercase;
}
.chapter-node[data-kind="flashback"] .kind-label { color: var(--accent-flash); }
.chapter-node[data-kind="pivot"] .kind-label { color: var(--accent-pivot); }

.chapter-node:hover {
  border-color: var(--cold);
  transform: translateY(-3px);
  box-shadow: 0 12px 36px rgba(92,184,179,0.14);
}
.chapter-node[data-kind="flashback"]:hover { border-color: var(--accent-flash); box-shadow: 0 12px 36px rgba(212,201,122,0.14); }
.chapter-node[data-kind="pivot"]:hover     { border-color: var(--accent-pivot); box-shadow: 0 12px 36px rgba(184,110,143,0.14); }

/* ==== CHAPTER PAGE ==== */
.chapter-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 110px 24px 120px;
}

.chapter-cover {
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: 420px;
  margin: 0 auto 44px;
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  position: relative;
  overflow: hidden;
  opacity: 0;
  transform: scale(0.96);
  transition: opacity 1.1s ease-out, transform 1.1s ease-out;
}
.chapter-cover.is-visible { opacity: 1; transform: none; }
.chapter-cover img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: brightness(0.92) contrast(1.05);
}

.chapter-page h1 {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(28px, 4.5vw, 42px);
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--ink);
  margin-bottom: 30px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--rule);
  position: relative;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 1s ease-out, transform 1s ease-out;
}
.chapter-page h1.is-visible { opacity: 1; transform: none; }
.chapter-page[data-kind="flashback"] h1 { color: var(--accent-flash); border-bottom-color: var(--accent-flash); opacity: 0.95; }
.chapter-page[data-kind="pivot"] h1     { color: var(--accent-pivot); border-bottom-color: var(--accent-pivot); }

.chapter-page p {
  margin-bottom: 1.3em;
  text-align: left;
  hyphens: auto;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .9s ease-out, transform .9s ease-out;
}
.chapter-page p.is-visible { opacity: 1; transform: none; }

.chapter-page p:first-of-type::first-letter {
  font-family: 'JetBrains Mono', monospace;
  font-size: 3.4em;
  float: left;
  line-height: 0.85;
  margin: 6px 8px 0 0;
  color: var(--cold);
}

.chapter-page em {
  color: var(--warm);
  font-style: italic;
  font-weight: 400;
}
.chapter-page strong { color: var(--ink); font-weight: 600; }

.chapter-page blockquote {
  border-left: 2px solid var(--cold);
  padding: 6px 0 6px 22px;
  margin: 28px 0;
  color: var(--ink-soft);
  font-style: italic;
  background: linear-gradient(90deg, var(--cold-glow), transparent);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .9s ease-out, transform .9s ease-out;
}
.chapter-page blockquote.is-visible { opacity: 1; transform: none; }

.chapter-page hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--rule-strong), transparent);
  margin: 50px 0;
  opacity: 0;
  transition: opacity 1s ease-out;
}
.chapter-page hr.is-visible { opacity: 1; }

/* ==== AUDIO BLOCK (prominent) ==== */
.audio-block {
  background: linear-gradient(135deg, var(--bg-elev) 0%, var(--bg-soft) 100%);
  border: 1px solid var(--cold);
  border-left: 3px solid var(--cold);
  padding: 22px 26px;
  margin-bottom: 56px;
  display: flex;
  align-items: center;
  gap: 20px;
  box-shadow: 0 4px 28px var(--cold-glow);
  position: relative;
  overflow: hidden;
}
.audio-block::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top left, var(--cold-glow), transparent 70%);
  pointer-events: none;
}
.audio-block .audio-icon {
  flex: 0 0 36px;
  width: 36px; height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cold);
}
.audio-block .audio-icon svg { width: 100%; height: 100%; }
.audio-block .label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.25em;
  color: var(--cold);
  text-transform: uppercase;
  font-weight: 600;
  flex: 0 0 auto;
}
.audio-block audio {
  flex: 1;
  max-width: 100%;
  height: 40px;
}
.audio-block audio::-webkit-media-controls-panel { background: var(--bg-elev); }

.audio-block.no-file {
  border-left-color: var(--ink-mute);
  border-color: var(--rule);
  box-shadow: none;
}
.audio-block.no-file .audio-icon { color: var(--ink-mute); }
.audio-block.no-file .label { color: var(--ink-mute); }
.audio-block.no-file::before { display: none; }
.audio-block.no-file .placeholder {
  flex: 1;
  font-family: 'Newsreader', serif;
  font-style: italic;
  font-size: 14px;
  color: var(--ink-mute);
}

/* sound-wave decoration on hover */
.audio-block .wave {
  display: flex;
  align-items: center;
  gap: 3px;
  flex: 0 0 auto;
  height: 24px;
  opacity: 0.7;
}
.audio-block .wave span {
  display: block;
  width: 3px;
  background: var(--cold);
  border-radius: 1px;
  animation: wave-pulse 1.4s ease-in-out infinite;
}
.audio-block .wave span:nth-child(1) { height: 8px;  animation-delay: 0s; }
.audio-block .wave span:nth-child(2) { height: 16px; animation-delay: 0.15s; }
.audio-block .wave span:nth-child(3) { height: 22px; animation-delay: 0.3s; }
.audio-block .wave span:nth-child(4) { height: 14px; animation-delay: 0.45s; }
.audio-block .wave span:nth-child(5) { height: 10px; animation-delay: 0.6s; }
@keyframes wave-pulse {
  0%, 100% { transform: scaleY(0.4); }
  50%      { transform: scaleY(1); }
}
.audio-block.no-file .wave span { background: var(--ink-mute); animation: none; }

.chapter-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-top: 70px;
  padding-top: 30px;
  border-top: 1px solid var(--rule);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.1em;
}
.chapter-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  border: 1px solid var(--rule);
  padding: 12px 20px;
  transition: all .25s;
  flex: 0 1 auto;
  max-width: 45%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.chapter-nav a:hover {
  color: var(--cold);
  border-color: var(--cold);
  background: var(--cold-glow);
}
.chapter-nav .to-index {
  color: var(--ink-mute);
  border: none;
  flex: 0 0 auto;
}
.chapter-nav .to-index:hover { color: var(--cold); background: transparent; }

@media (max-width: 768px) {
  body { font-size: 16px; }
  .topbar { padding: 12px 16px; }
  .topbar .brand { font-size: 12px; }
  .hero { padding: 110px 5vw 40px; }
  .chapter-list { grid-template-columns: 1fr; }
  .chapter-page { padding: 100px 18px 80px; }
  .chapter-page p:first-of-type::first-letter { font-size: 2.6em; margin-right: 6px; }
  .audio-block { padding: 16px 18px; flex-wrap: wrap; gap: 12px; }
  .audio-block audio { width: 100%; flex: 1 0 100%; }
  .chapter-nav { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .chapter-page p, .chapter-page blockquote, .chapter-page hr,
  .chapter-page h1, .chapter-cover, .chapter-node, .intro-block,
  .part-divider, .hero {
    opacity: 1 !important;
    transform: none !important;
  }
}