:root {
  color-scheme: dark;
  --ink: #f8f5ec;
  --muted: rgba(248, 245, 236, 0.68);
  --quiet: rgba(248, 245, 236, 0.44);
  --line: rgba(248, 245, 236, 0.16);
  --ground: #030303;
  --cyan: #62f0ff;
  --amber: #f4c45d;
  --red: #ff6a5c;
  --green: #79e18c;
  --scroll: 0;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--ground);
  scroll-behavior: smooth;
}

body {
  min-height: 100svh;
  margin: 0;
  overflow-x: hidden;
  background:
    linear-gradient(270deg, rgba(3, 3, 3, 0.96), rgba(3, 3, 3, 0.62) 46%, rgba(3, 3, 3, 0.18)),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.025) 0 1px, transparent 1px 22px),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.02) 0 1px, transparent 1px 26px),
    var(--ground);
  color: var(--ink);
  font-family:
    Assistant,
    "Segoe UI",
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    Arial,
    sans-serif;
  letter-spacing: 0;
}

body::after {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  content: "";
  background:
    linear-gradient(270deg, rgba(0, 0, 0, 0.62), rgba(0, 0, 0, 0.24) 46%, transparent 76%),
    linear-gradient(180deg, rgba(0, 0, 0, 0.3), transparent 24%, transparent 70%, rgba(0, 0, 0, 0.54)),
    linear-gradient(90deg, rgba(98, 240, 255, 0.07), transparent 22%, transparent 72%, rgba(244, 196, 93, 0.07));
}

a,
button {
  font: inherit;
}

a {
  color: inherit;
}

#zuga-field {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  background: #030303;
}

.site-header {
  position: fixed;
  inset: 28px 32px auto 32px;
  z-index: 4;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  color: var(--ink);
}

.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 9px;
  color: inherit;
  text-decoration: none;
  direction: ltr;
}

.brand span {
  display: inline-grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid rgba(248, 245, 236, 0.34);
  border-radius: 50%;
  color: var(--amber);
  font-size: 1.5rem;
  line-height: 1;
}

.brand strong {
  font-size: 0.88rem;
  font-weight: 650;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  color: var(--muted);
  font-size: 0.9rem;
}

.header-nav a {
  position: relative;
  text-decoration: none;
  white-space: nowrap;
}

.header-nav .nav-home-link,
.header-nav .nav-book-link {
  color: var(--ink);
  font-weight: 650;
}

.header-nav .nav-book-link::before {
  display: inline-block;
  margin-left: 8px;
  color: var(--amber);
  content: "∞";
}

.header-nav a::after {
  position: absolute;
  right: 0;
  bottom: -7px;
  width: 100%;
  height: 1px;
  transform: scaleX(0);
  transform-origin: right;
  background: rgba(244, 196, 93, 0.72);
  content: "";
  transition: transform 180ms ease;
}

.header-nav a:hover::after,
.header-nav a:focus-visible::after {
  transform: scaleX(1);
}

.page-shell {
  position: relative;
  z-index: 2;
}

.entrance {
  display: grid;
  min-height: 100svh;
  padding: 110px 32px 34px;
  align-items: center;
}

.hero-copy {
  width: min(720px, 100%);
  justify-self: start;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--amber);
  font-size: 1rem;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.16em;
  margin-bottom: 0;
  direction: ltr;
  font-family:
    Georgia,
    "Times New Roman",
    serif;
  font-size: 6.8rem;
  font-weight: 500;
  line-height: 0.88;
  letter-spacing: 0;
  text-wrap: balance;
}

h1 span:first-child {
  color: var(--amber);
  text-shadow: 0 0 26px rgba(244, 196, 93, 0.28);
}

.he-line,
.en-line,
.summary {
  max-width: 660px;
}

.he-line {
  margin: 28px 0 0;
  color: var(--ink);
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.16;
}

.en-line {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 1.2rem;
  line-height: 1.42;
}

.summary {
  margin: 26px 0 0;
  color: var(--muted);
  font-size: 1.18rem;
  line-height: 1.65;
}

.formula,
.large-formula {
  direction: ltr;
  font-family:
    "Cascadia Mono",
    "Segoe UI Mono",
    Consolas,
    monospace;
}

.formula {
  display: grid;
  gap: 8px;
  width: min(620px, 100%);
  margin-top: 28px;
  padding-right: 18px;
  border-right: 1px solid rgba(244, 196, 93, 0.48);
  color: rgba(248, 245, 236, 0.82);
  font-size: 0.96rem;
  line-height: 1.6;
}

.formula span {
  overflow-wrap: anywhere;
}

.enter-button,
.source-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid rgba(248, 245, 236, 0.34);
  border-radius: 2px;
  background: rgba(248, 245, 236, 0.08);
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
  transition:
    border-color 180ms ease,
    background 180ms ease,
    transform 180ms ease;
}

.enter-button {
  min-width: 168px;
  margin-top: 34px;
}

.enter-button:hover,
.enter-button:focus-visible,
.source-link:hover,
.source-link:focus-visible {
  border-color: rgba(98, 240, 255, 0.72);
  background: rgba(98, 240, 255, 0.13);
  outline: none;
  transform: translateY(-1px);
}

.enter-button.is-active {
  border-color: rgba(244, 196, 93, 0.78);
  background: rgba(244, 196, 93, 0.15);
}

.theory-section {
  position: relative;
  display: grid;
  grid-template-columns: minmax(54px, 104px) minmax(0, 760px);
  gap: clamp(24px, 5vw, 76px);
  min-height: 78svh;
  padding: max(90px, 12vh) clamp(32px, 8vw, 116px) max(110px, 14vh);
  align-items: center;
  border-top: 1px solid rgba(248, 245, 236, 0.08);
  background:
    linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.76) 28%, rgba(0, 0, 0, 0.82) 78%, transparent),
    linear-gradient(180deg, rgba(3, 3, 3, 0.22), rgba(3, 3, 3, 0.58)),
    linear-gradient(90deg, rgba(98, 240, 255, 0.035), transparent 42%, rgba(244, 196, 93, 0.035));
}

.theory-section::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
  background:
    radial-gradient(circle at calc(18% + var(--scroll) * 18%) 34%, rgba(98, 240, 255, 0.08), transparent 28%),
    radial-gradient(circle at calc(88% - var(--scroll) * 14%) 64%, rgba(244, 196, 93, 0.07), transparent 26%);
}

.section-number {
  position: relative;
  align-self: start;
  margin: 0;
  color: rgba(244, 196, 93, 0.82);
  direction: ltr;
  font-family:
    Georgia,
    "Times New Roman",
    serif;
  font-size: clamp(2.7rem, 7vw, 6rem);
  line-height: 0.84;
}

.section-copy {
  position: relative;
  max-width: 760px;
}

.section-copy h2 {
  max-width: 760px;
  margin-bottom: 24px;
  color: var(--ink);
  font-family:
    Georgia,
    "Times New Roman",
    serif;
  font-size: clamp(2.15rem, 5.8vw, 5.4rem);
  font-weight: 500;
  line-height: 0.96;
  letter-spacing: 0;
  text-wrap: balance;
}

.section-copy p {
  max-width: 690px;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: clamp(1.02rem, 1.4vw, 1.26rem);
  line-height: 1.74;
}

.large-formula {
  width: min(760px, 100%);
  margin: 34px 0 0;
  padding: 18px 0;
  border-top: 1px solid rgba(248, 245, 236, 0.16);
  border-bottom: 1px solid rgba(248, 245, 236, 0.16);
  color: rgba(248, 245, 236, 0.88);
  font-size: clamp(0.88rem, 1.3vw, 1.05rem);
  overflow-wrap: anywhere;
}

.structure-formula-stack {
  display: grid;
  gap: 10px;
}

.genesis-formula-stack {
  display: grid;
  gap: 10px;
  font-size: clamp(0.72rem, 1.08vw, 0.94rem);
  line-height: 1.62;
}

.genesis-formula-stack span {
  overflow-wrap: anywhere;
}

.genesis-formula-stack .hebrew-line {
  color: var(--amber);
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
}

.structure-note {
  margin-top: 22px;
}

.structure-section {
  grid-template-columns: minmax(54px, 104px) minmax(0, 620px) minmax(0, 1fr);
  align-items: start;
}

.structure-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-column: 1 / -1;
  gap: 24px 30px;
  margin-top: 40px;
}

.structure-grid article {
  min-height: 190px;
  padding: 22px 0 0;
  border-top: 1px solid rgba(248, 245, 236, 0.2);
}

.structure-grid span {
  display: block;
  margin-bottom: 36px;
  color: var(--amber);
  direction: ltr;
  font-family:
    "Cascadia Mono",
    "Segoe UI Mono",
    Consolas,
    monospace;
  font-size: 0.98rem;
}

.structure-grid h3 {
  margin-bottom: 10px;
  color: var(--ink);
  font-size: 1.18rem;
}

.structure-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.72;
}

.motion-equation {
  position: relative;
  display: grid;
  grid-column: 1 / -1;
  gap: 14px;
  margin-top: 18px;
  padding: 24px 0 0;
  border-top: 1px solid rgba(244, 196, 93, 0.34);
}

.motion-equation > span {
  color: var(--amber);
  font-size: 0.95rem;
}

.motion-equation strong {
  color: var(--ink);
  direction: ltr;
  font-family:
    "Cascadia Mono",
    "Segoe UI Mono",
    Consolas,
    monospace;
  font-size: clamp(0.92rem, 1.5vw, 1.15rem);
  overflow-wrap: anywhere;
}

.motion-equation p {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.72;
}

.movement-list {
  display: grid;
  gap: 0;
  width: min(760px, 100%);
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: movement;
}

.movement-list li {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 24px;
  padding: 20px 0;
  border-top: 1px solid rgba(248, 245, 236, 0.16);
}

.movement-list li:last-child {
  border-bottom: 1px solid rgba(248, 245, 236, 0.16);
}

.movement-list strong {
  color: var(--ink);
  font-size: 1rem;
}

.movement-list span {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.65;
}

blockquote {
  margin: 34px 0;
  padding: 0 22px 0 0;
  border-right: 1px solid rgba(244, 196, 93, 0.58);
  color: rgba(248, 245, 236, 0.9);
  direction: ltr;
  font-family:
    Georgia,
    "Times New Roman",
    serif;
  font-size: clamp(1.45rem, 3vw, 2.4rem);
  line-height: 1.2;
}

.source-link {
  margin-top: 24px;
}

.book-shell {
  position: relative;
  z-index: 2;
}

.book-hero {
  display: grid;
  min-height: 82svh;
  padding: 116px clamp(24px, 7vw, 110px) 72px;
  align-content: center;
  justify-items: start;
}

.book-hero h1 {
  max-width: 980px;
  margin-bottom: 26px;
  line-height: 0.94;
}

.book-lead {
  max-width: 640px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1.06rem, 1.6vw, 1.3rem);
  line-height: 1.7;
}

.book-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.reader-layout {
  position: relative;
  display: grid;
  grid-template-columns: minmax(180px, 250px) minmax(0, 790px);
  gap: clamp(36px, 7vw, 96px);
  padding: 88px clamp(24px, 8vw, 116px) 140px;
  border-top: 1px solid rgba(248, 245, 236, 0.12);
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.72), rgba(0, 0, 0, 0.88) 34%, rgba(0, 0, 0, 0.82) 84%, transparent),
    linear-gradient(180deg, rgba(3, 3, 3, 0.28), rgba(3, 3, 3, 0.74));
}

.book-toc {
  position: sticky;
  top: 96px;
  align-self: start;
  max-height: calc(100svh - 132px);
  overflow: auto;
  padding: 4px 0 20px;
  border-top: 1px solid rgba(244, 196, 93, 0.44);
  color: var(--quiet);
  scrollbar-width: thin;
}

.book-toc > span {
  display: block;
  margin: 18px 0 16px;
  color: var(--amber);
  font-size: 0.92rem;
}

.book-toc a {
  display: block;
  padding: 10px 0;
  border-bottom: 1px solid rgba(248, 245, 236, 0.08);
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.35;
  text-decoration: none;
}

.book-toc a:hover,
.book-toc a:focus-visible {
  color: var(--ink);
  outline: none;
}

.book-content {
  max-width: 790px;
  color: var(--ink);
  margin-top: -86px;
  padding-top: 86px;
  scroll-margin-top: 0;
}

.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content h1,
.book-content h2,
.book-content h3 {
  scroll-margin-top: 112px;
  color: var(--ink);
  letter-spacing: 0;
}

.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content .book-title-heading,
.book-content h1 {
  display: block;
  margin: 0 0 28px;
  direction: rtl;
  font-family:
    Georgia,
    "Times New Roman",
    serif;
  font-size: clamp(2.65rem, 6.2vw, 5.8rem);
  font-weight: 500;
  line-height: 0.98;
}

.book-content h2 {
  margin: 76px 0 24px;
  padding-top: 28px;
  border-top: 1px solid rgba(244, 196, 93, 0.34);
  font-family:
    Georgia,
    "Times New Roman",
    serif;
  font-size: clamp(2rem, 4.2vw, 3.8rem);
  font-weight: 500;
  line-height: 1.06;
}

.book-content h2:first-of-type {
  margin-top: 50px;
}

.book-content h3 {
  margin: 42px 0 16px;
  color: rgba(248, 245, 236, 0.92);
  font-size: clamp(1.22rem, 2vw, 1.6rem);
  line-height: 1.3;
}

.book-content p {
  margin: 0 0 24px;
  color: rgba(248, 245, 236, 0.78);
  font-size: clamp(1.02rem, 1.18vw, 1.14rem);
  line-height: 1.95;
}

.book-content a {
  color: var(--amber);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.book-content .book-meta-line {
  margin-bottom: 12px;
  color: rgba(248, 245, 236, 0.56);
  font-size: 0.96rem;
  line-height: 1.7;
}

.reader-formula {
  display: grid;
  gap: 8px;
  margin: 28px 0 32px;
  padding: 18px 0 18px 18px;
  border-top: 1px solid rgba(98, 240, 255, 0.2);
  border-bottom: 1px solid rgba(98, 240, 255, 0.12);
  color: rgba(248, 245, 236, 0.88);
  direction: ltr;
  font-family:
    "Cascadia Mono",
    "Segoe UI Mono",
    Consolas,
    monospace;
  font-size: clamp(0.82rem, 1.1vw, 0.98rem);
  line-height: 1.65;
  overflow-x: auto;
}

.reader-formula span {
  min-width: min-content;
  white-space: normal;
  overflow-wrap: anywhere;
}

.book-page .signal-strip {
  display: none;
}

.header-nav a[aria-current="page"] {
  color: var(--ink);
}

.header-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.signal-strip {
  position: fixed;
  right: 32px;
  bottom: 24px;
  left: 32px;
  z-index: 4;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  color: var(--quiet);
  font-size: 0.92rem;
  pointer-events: none;
  transition:
    opacity 180ms ease,
    transform 180ms ease;
}

html[data-depth="reading"] .signal-strip {
  opacity: 0.22;
  transform: translateY(5px);
}

.signal-strip span {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  min-height: 28px;
  white-space: nowrap;
}

.signal-strip strong {
  color: var(--ink);
  direction: ltr;
  font-family:
    "Cascadia Mono",
    "Segoe UI Mono",
    Consolas,
    monospace;
  font-weight: 650;
}

@media (min-width: 1180px) {
  h1 {
    font-size: 8.8rem;
  }

  .hero-copy {
    margin-right: 4vw;
  }
}

@media (max-width: 1180px) {
  .structure-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .structure-grid article:last-child {
    grid-column: auto;
  }
}

@media (max-width: 760px) {
  .site-header {
    inset: 22px 20px auto 20px;
    gap: 12px;
  }

  .header-nav {
    flex: 1 1 auto;
    justify-content: flex-start;
    min-width: 0;
    max-width: calc(100vw - 126px);
    gap: 12px;
    overflow-x: auto;
    font-size: 0.78rem;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .header-nav::-webkit-scrollbar {
    display: none;
  }

  .entrance {
    min-height: 100svh;
    padding: 92px 20px 112px;
    align-items: end;
  }

  h1 {
    font-size: 4.3rem;
    line-height: 0.92;
  }

  .he-line {
    margin-top: 22px;
    font-size: 1.45rem;
  }

  .en-line,
  .summary {
    font-size: 1rem;
  }

  .summary {
    margin-top: 20px;
  }

  .formula {
    margin-top: 22px;
    padding-right: 14px;
    font-size: 0.8rem;
  }

  .enter-button {
    width: 100%;
    margin-top: 26px;
  }

  .theory-section,
  .structure-section {
    grid-template-columns: 1fr;
    gap: 22px;
    min-height: auto;
    padding: 108px 20px 104px;
    background:
      linear-gradient(180deg, rgba(0, 0, 0, 0.72), rgba(0, 0, 0, 0.78)),
      linear-gradient(90deg, rgba(98, 240, 255, 0.045), transparent 48%, rgba(244, 196, 93, 0.045));
  }

  .section-number {
    font-size: 3rem;
  }

  .section-copy h2 {
    font-size: 2.46rem;
    line-height: 1;
  }

  .section-copy p {
    font-size: 1rem;
    line-height: 1.72;
  }

  .structure-grid {
    grid-template-columns: 1fr;
    grid-column: auto;
    gap: 0;
    margin-top: 8px;
  }

  .structure-grid article,
  .structure-grid article:last-child {
    grid-column: auto;
    min-height: auto;
    padding: 20px 0;
  }

  .structure-grid span {
    margin-bottom: 14px;
  }

  .movement-list li {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  blockquote {
    padding-right: 16px;
  }

  .source-link {
    width: 100%;
  }

  .book-hero {
    min-height: 76svh;
    padding: 104px 20px 60px;
  }

  .book-hero h1 {
    font-size: 3.3rem;
  }

  .book-actions {
    width: 100%;
  }

  .reader-layout {
    grid-template-columns: 1fr;
    gap: 36px;
    padding: 72px 20px 110px;
    background:
      linear-gradient(180deg, rgba(0, 0, 0, 0.76), rgba(0, 0, 0, 0.86)),
      linear-gradient(90deg, rgba(98, 240, 255, 0.04), transparent 52%, rgba(244, 196, 93, 0.04));
  }

  .book-toc {
    position: static;
    max-height: none;
    overflow: visible;
  }

  .book-toc a {
    padding: 9px 0;
    font-size: 0.88rem;
  }

  .book-content .book-title-heading,
  .book-content .book-title-heading,
  .book-content .book-title-heading,
  .book-content .book-title-heading,
  .book-content .book-title-heading,
  .book-content .book-title-heading,
  .book-content .book-title-heading,
  .book-content .book-title-heading,
  .book-content .book-title-heading,
  .book-content .book-title-heading,
  .book-content .book-title-heading,
  .book-content h1 {
    font-size: 2.48rem;
  }

  .book-content h2 {
    margin-top: 64px;
    font-size: 2.25rem;
  }

  .book-content p {
    font-size: 1rem;
    line-height: 1.86;
  }

  .reader-formula span {
    white-space: normal;
    overflow-wrap: anywhere;
  }

  .signal-strip {
    right: 20px;
    bottom: 18px;
    left: 20px;
    gap: 6px 12px;
    font-size: 0.78rem;
  }

  html[data-depth="reading"] .signal-strip {
    opacity: 0;
    transform: translateY(12px);
  }
}

@media (max-width: 390px) {
  h1 {
    font-size: 3.55rem;
  }

  .formula,
  .large-formula {
    font-size: 0.74rem;
  }

  .header-nav {
    max-width: calc(100vw - 116px);
    gap: 9px;
  }
}

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

  .enter-button,
  .source-link,
  .header-nav a::after {
    transition: none;
  }
}