:root {
  color-scheme: dark;
  --bg: #050705;
  --bg-soft: #0c1110;
  --ink: #eff9eb;
  --muted: #9aa99d;
  --dim: #5f7367;
  --line: rgba(168, 255, 186, 0.2);
  --green: #72f286;
  --cyan: #5bd7ff;
  --amber: #f8c75c;
  --rose: #ff6f9d;
  --paper: rgba(12, 18, 15, 0.88);
  --panel: rgba(7, 13, 11, 0.82);
  --code: #060a07;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(rgba(114, 242, 134, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(114, 242, 134, 0.045) 1px, transparent 1px),
    radial-gradient(circle at 82% 8%, rgba(91, 215, 255, 0.12), transparent 24rem),
    radial-gradient(circle at 12% 18%, rgba(255, 111, 157, 0.08), transparent 20rem),
    linear-gradient(180deg, #050705 0%, #0b1010 42%, #07100d 100%);
  background-size: 42px 42px, 42px 42px, auto, auto, auto;
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.72;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 40;
  pointer-events: none;
  background: repeating-linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.035) 0,
    rgba(255, 255, 255, 0.035) 1px,
    transparent 1px,
    transparent 5px
  );
  mix-blend-mode: overlay;
  opacity: 0.28;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(90deg, rgba(255, 111, 157, 0.05), transparent 34%, rgba(91, 215, 255, 0.045)),
    linear-gradient(180deg, transparent, rgba(248, 199, 92, 0.035));
}

a {
  color: var(--cyan);
  text-decoration: none;
}

a:hover {
  color: var(--green);
  text-decoration: none;
}

button,
input {
  font: inherit;
}

.book-shell {
  display: grid;
  grid-template-columns: 19rem minmax(0, 1fr);
  min-height: 100vh;
}

.book-sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  border-right: 1px solid rgba(239, 249, 235, 0.1);
  background: rgba(5, 7, 5, 0.82);
  backdrop-filter: blur(18px);
  padding: 1rem;
}

.book-brand {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 1rem;
  padding: 0.85rem;
  border: 1px solid rgba(239, 249, 235, 0.13);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(114, 242, 134, 0.08), transparent 52%),
    rgba(7, 13, 11, 0.72);
}

.book-brand strong {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.86rem;
  letter-spacing: 0;
  text-transform: uppercase;
}

.book-sigil {
  width: 1.35rem;
  height: 1.35rem;
  flex: 0 0 auto;
  overflow: visible;
  filter: drop-shadow(0 0 10px rgba(114, 242, 134, 0.32));
}

.book-sigil .sigil-ring,
.book-sigil .sigil-stem {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.book-sigil .sigil-ring {
  stroke: rgba(91, 215, 255, 0.62);
  stroke-width: 1.35;
}

.book-sigil .sigil-stem {
  stroke: var(--green);
  stroke-width: 1.85;
}

.book-sigil .sigil-node {
  stroke: #050705;
  stroke-width: 0.8;
}

.book-sigil .sigil-node-core {
  fill: var(--green);
}

.book-sigil .sigil-node-a {
  fill: var(--cyan);
}

.book-sigil .sigil-node-b {
  fill: var(--amber);
}

.book-sigil .sigil-node-c {
  fill: var(--rose);
}

.book-brand span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.74rem;
  line-height: 1.45;
}

.book-search {
  width: 100%;
  min-height: 2.45rem;
  border: 1px solid rgba(239, 249, 235, 0.14);
  border-radius: 8px;
  padding: 0 0.75rem;
  margin-bottom: 1rem;
  outline: none;
  background: rgba(6, 10, 7, 0.82);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.78rem;
}

.book-search::placeholder {
  color: var(--dim);
}

.book-search:focus {
  border-color: rgba(114, 242, 134, 0.55);
  box-shadow: 0 0 0 3px rgba(114, 242, 134, 0.08);
}

.toc {
  display: grid;
  gap: 0.16rem;
  font-family: var(--mono);
  font-size: 0.76rem;
}

.toc a {
  display: block;
  border-left: 1px solid rgba(239, 249, 235, 0.12);
  padding: 0.42rem 0.55rem 0.42rem 0.75rem;
  color: var(--muted);
}

.toc a:hover,
.toc a.is-active {
  border-color: var(--green);
  background: rgba(114, 242, 134, 0.07);
  color: var(--green);
}

.book-main {
  min-width: 0;
}

.book-topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  min-height: 3.8rem;
  border-bottom: 1px solid rgba(239, 249, 235, 0.1);
  background: rgba(5, 7, 5, 0.78);
  backdrop-filter: blur(18px);
  padding: 0 2rem;
}

.book-topbar span,
.book-topbar a {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.78rem;
}

.book-topbar a {
  border: 1px solid rgba(239, 249, 235, 0.12);
  border-radius: 999px;
  padding: 0.38rem 0.7rem;
}

.book-topbar a:hover {
  border-color: rgba(114, 242, 134, 0.45);
  color: var(--green);
}

.book-content {
  max-width: 68rem;
  margin: 0 auto;
  padding: 3rem 2rem 6rem;
}

.hero {
  position: relative;
  overflow: hidden;
  margin-bottom: 1rem;
  padding: 2rem;
  border: 1px solid rgba(114, 242, 134, 0.18);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(114, 242, 134, 0.08), transparent 42%),
    rgba(7, 13, 11, 0.72);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(239, 249, 235, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(239, 249, 235, 0.035) 1px, transparent 1px);
  background-size: 1.1rem 1.1rem;
  mask-image: linear-gradient(130deg, black, transparent 72%);
}

.hero > * {
  position: relative;
  z-index: 1;
}

.eyebrow {
  margin: 0 0 0.55rem;
  color: var(--green);
  font-family: var(--mono);
  font-size: 0.78rem;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.16;
  letter-spacing: 0;
}

h1 {
  max-width: 58rem;
  margin: 0 0 1rem;
  color: var(--ink);
  font-family: var(--mono);
  font-size: clamp(2.5rem, 5vw, 5rem);
}

h2 {
  margin: 4rem 0 1rem;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(239, 249, 235, 0.1);
  color: var(--ink);
  font-family: var(--mono);
  font-size: clamp(1.55rem, 2.4vw, 2.4rem);
}

h2::before {
  content: "// ";
  color: var(--green);
}

h3 {
  margin: 2rem 0 0.75rem;
  color: var(--amber);
  font-family: var(--mono);
  font-size: 1.1rem;
}

p {
  margin: 0 0 1rem;
  color: #c5d3c6;
}

.lead {
  max-width: 58rem;
  color: #d9e4d7;
  font-size: 1.1rem;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 2rem;
}

.meta-grid div,
.callout,
.proof,
.deployment-card,
.chapter-card {
  border: 1px solid rgba(239, 249, 235, 0.13);
  border-radius: 8px;
  background: var(--paper);
}

.meta-grid div {
  padding: 0.9rem;
}

.meta-grid span {
  display: block;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
}

.meta-grid strong {
  display: block;
  margin-top: 0.3rem;
  color: var(--ink);
  font-size: 0.95rem;
}

.callout {
  margin: 1.25rem 0;
  padding: 1rem;
  border-color: rgba(91, 215, 255, 0.26);
  background: rgba(91, 215, 255, 0.055);
}

.callout.warning {
  border-color: rgba(248, 199, 92, 0.28);
  background: rgba(248, 199, 92, 0.055);
}

.callout strong,
.proof strong {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.8rem;
  text-transform: uppercase;
}

.callout.warning strong {
  color: var(--amber);
}

.equation,
pre {
  margin: 1rem 0;
  overflow-x: auto;
  border: 1px solid rgba(114, 242, 134, 0.26);
  border-radius: 8px;
  background: var(--code);
  color: var(--green);
}

.equation span {
  display: block;
  border-bottom: 1px solid rgba(239, 249, 235, 0.1);
  padding: 0.65rem 0.85rem;
  color: var(--amber);
  font-family: var(--mono);
  font-size: 0.75rem;
}

.equation code,
pre code {
  display: block;
  padding: 0.95rem;
  font-family: var(--mono);
  font-size: 0.84rem;
  white-space: pre;
}

.proof {
  margin: 1.25rem 0;
  padding: 1rem;
  border-color: rgba(248, 199, 92, 0.28);
  background: rgba(248, 199, 92, 0.045);
}

.proof strong {
  color: var(--amber);
}

.manual-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2rem 0;
  overflow: hidden;
  border: 1px solid rgba(239, 249, 235, 0.12);
  border-radius: 8px;
  background: var(--paper);
  font-size: 0.92rem;
}

.manual-table th,
.manual-table td {
  border-bottom: 1px solid rgba(239, 249, 235, 0.09);
  padding: 0.8rem;
  text-align: left;
  vertical-align: top;
}

.manual-table th {
  background: rgba(91, 215, 255, 0.06);
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.76rem;
}

.manual-table td {
  color: #c5d3c6;
}

.chapter-grid,
.deployment-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
  margin: 1rem 0 1.5rem;
}

.chapter-card,
.deployment-card {
  min-height: 8rem;
  padding: 1rem;
}

.chapter-card span,
.deployment-card span {
  color: var(--green);
  font-family: var(--mono);
  font-size: 0.76rem;
}

.chapter-card p,
.deployment-card p {
  margin-bottom: 0;
}

.refs {
  display: grid;
  gap: 0.8rem;
  padding-left: 1.25rem;
  color: #c5d3c6;
}

.refs li::marker {
  color: var(--amber);
}

.refs span {
  display: block;
  margin-top: 0.2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.next-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(239, 249, 235, 0.1);
}

.next-nav a {
  border: 1px solid rgba(239, 249, 235, 0.13);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  background: var(--paper);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.82rem;
}

.next-nav a:hover {
  border-color: rgba(114, 242, 134, 0.45);
  color: var(--green);
}

@media (max-width: 980px) {
  .book-shell {
    grid-template-columns: 1fr;
  }

  .book-sidebar {
    position: static;
    height: auto;
    max-height: 24rem;
  }

  .book-topbar {
    padding: 0 1rem;
  }

  .book-content {
    padding: 2rem 1rem 4rem;
  }

  .meta-grid,
  .chapter-grid,
  .deployment-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .book-content {
    padding-inline: 0.85rem;
  }

  .hero {
    padding: 1rem;
  }

  .book-topbar {
    align-items: flex-start;
    flex-direction: column;
    padding: 0.85rem;
  }

  .manual-table {
    display: block;
    overflow-x: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }
}