.book-page {
  min-height: 100vh;
}

.book-page .masthead {
  position: sticky;
  z-index: 30;
  top: 0;
}

.book-shell {
  display: grid;
  grid-template-columns: 292px minmax(0, 1fr);
  width: min(1540px, 100%);
  margin: 0 auto;
}

.book-toc {
  position: sticky;
  top: 64px;
  align-self: start;
  height: calc(100vh - 64px);
  padding: 0 15px 24px;
  overflow-y: auto;
  background:
    repeating-linear-gradient(0deg, transparent 0 5px, rgba(255,255,255,.018) 5px 6px),
    #080608;
  border-right: 2px solid #681b46;
  scrollbar-color: var(--pink) #090709;
}

.toc-head {
  position: sticky;
  z-index: 2;
  top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0 -15px 12px;
  padding: 13px 14px 11px;
  color: #090709;
  background:
    repeating-linear-gradient(-12deg, rgba(0,0,0,.1) 0 1px, transparent 1px 7px),
    var(--pink-hot);
  font-size: 11px;
}

.toc-head button {
  display: none;
  color: white;
  background: #090709;
  border: 1px solid white;
  cursor: pointer;
}

.toc-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.toc-list li {
  border-bottom: 1px dashed #32172a;
}

.toc-list a {
  display: block;
  padding: 8px 5px;
  color: #bdaeb7;
  font-size: 10px;
  line-height: 1.4;
  text-decoration: none;
}

.toc-list .toc-depth-3 a {
  padding: 5px 5px 5px 19px;
  color: #74626d;
  font-size: 9px;
}

.toc-list a:hover,
.toc-list a.active {
  color: var(--pink);
  background: rgba(255,15,127,.07);
}

.toc-list a.active::before {
  content: "> ";
}

.toc-ide-link {
  display: block;
  margin-top: 20px;
  padding: 10px;
  color: #090709;
  background: var(--acid);
  border: 2px solid #090709;
  box-shadow: 4px 4px 0 #5a153c;
  font-size: 10px;
  text-align: center;
  text-decoration: none;
}

.book-main {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 55px clamp(22px, 5vw, 84px) 90px;
  overflow: hidden;
}

.book-hero,
.book-content,
.book-end {
  width: min(930px, 100%);
  margin-right: auto;
  margin-left: auto;
}

.book-hero {
  position: relative;
  min-height: 500px;
  padding: 44px 20px 70px;
  border-bottom: 2px solid var(--pink-hot);
}

.book-hero::before {
  content: "PLAIN TEXT IS A REAL PROGRAM";
  position: absolute;
  top: 20px;
  right: 0;
  padding: 4px 8px;
  color: #090709;
  background: rgba(198, 182, 163, .75);
  font-size: 8px;
  transform: rotate(2deg);
}

.book-hero h1 {
  margin-top: 65px;
  font-size: clamp(66px, 8vw, 128px);
  line-height: .78;
}

.book-hero > p:last-of-type {
  max-width: 580px;
  margin: 38px 0 0;
  color: #bcaeb7;
  font-size: 15px;
  line-height: 1.7;
}

.book-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.book-hero-actions a {
  padding: 9px 12px;
  color: #090709;
  background: var(--pink);
  border: 1px solid #ff91c5;
  box-shadow: 4px 4px 0 #4b0b32;
  font-size: 10px;
  text-decoration: none;
}

.book-hero-actions a:last-child {
  color: var(--smoke);
  background: #130e12;
  border-color: #7a315c;
}

.book-content {
  padding: 38px 20px;
  color: #cbbdc6;
  font-size: 14px;
  line-height: 1.85;
}

.book-content > p:first-child {
  color: #f0e5eb;
  font-size: 17px;
}

.book-content h2,
.book-content h3,
.book-content h4 {
  scroll-margin-top: 90px;
}

.book-content h2 {
  position: relative;
  margin: 100px 0 30px;
  padding: 18px 16px 15px;
  color: #f5e8ef;
  background:
    repeating-linear-gradient(90deg, transparent 0 27px, rgba(255,255,255,.025) 28px 29px),
    #171016;
  border: 1px solid #8f3267;
  box-shadow:
    7px 7px 0 #2b0b1e,
    -3px -3px 0 rgba(255,15,127,.15);
  font-size: clamp(24px, 3.4vw, 42px);
  line-height: 1.15;
}

.book-content h2::before {
  content: "CHAPTER";
  position: absolute;
  top: -13px;
  left: 17px;
  padding: 3px 6px;
  color: #090709;
  background: var(--pink-hot);
  font-size: 8px;
  letter-spacing: 1px;
}

.book-content h2[id^="appendix"]::before {
  content: "APPENDIX";
}

.book-content h3 {
  margin: 58px 0 18px;
  color: var(--pink);
  font-size: clamp(18px, 2.2vw, 26px);
  line-height: 1.25;
}

.book-content h3::before {
  content: "// ";
  color: #713052;
}

.book-content h4 {
  margin-top: 40px;
  color: var(--acid);
}

.book-content p {
  margin: 18px 0;
}

.book-content strong {
  color: #f3e8ee;
}

.book-content em {
  color: #d7a8c1;
}

.book-content a {
  color: var(--pink);
}

.book-content code {
  color: #f1c9dc;
  background: #080608;
  border: 1px solid #3c1730;
}

.book-content pre {
  position: relative;
  margin: 24px 0 32px;
  padding: 22px 20px;
  overflow: auto;
  color: #e5d9e0;
  background:
    repeating-linear-gradient(0deg, rgba(255,255,255,.022) 0 1px, transparent 1px 4px),
    #050405;
  border: 1px solid #7b2858;
  box-shadow: 6px 6px 0 #210817;
  font: 12px/1.65 var(--mono);
  tab-size: 2;
  scrollbar-color: var(--pink) #090709;
}

.book-content pre code {
  padding: 0;
  color: inherit;
  background: none;
  border: 0;
  font: inherit;
}

.copy-code {
  position: absolute;
  z-index: 2;
  top: 6px;
  right: 6px;
  padding: 4px 6px;
  color: #9e8996;
  background: #100c10;
  border: 1px solid #5b2747;
  font-size: 8px;
  cursor: pointer;
}

.copy-code:hover {
  color: #090709;
  background: var(--pink);
}

.book-content ul,
.book-content ol {
  margin: 18px 0;
  padding-left: 28px;
}

.book-content li {
  margin: 9px 0;
  padding-left: 5px;
}

.book-content li::marker {
  color: var(--pink);
}

.book-content hr {
  height: 16px;
  margin: 58px 0;
  background:
    linear-gradient(175deg, transparent 0 35%, #6d1d4a 36% 42%, transparent 43%),
    linear-gradient(3deg, transparent 0 55%, #2f1025 56% 65%, transparent 66%);
  border: 0;
}

.book-end {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  justify-content: space-between;
  padding: 22px 20px;
  color: var(--pink);
  border-top: 2px solid #7d2355;
  font-size: 10px;
}

.book-end a {
  color: #d5c6cf;
}

.toc-toggle {
  display: none;
}

.toc-scrim {
  position: fixed;
  z-index: 38;
  inset: 0;
  background: rgba(0,0,0,.72);
}

@media (max-width: 900px) {
  .book-shell {
    display: block;
  }

  .book-toc {
    position: fixed;
    z-index: 40;
    top: 0;
    left: 0;
    width: min(330px, 88vw);
    height: 100dvh;
    border-right-color: var(--pink-hot);
    box-shadow: 10px 0 0 rgba(255,15,127,.16);
    transform: translateX(-110%);
    transition: transform .24s ease;
  }

  .book-toc.open {
    transform: translateX(0);
  }

  .toc-head button {
    display: block;
  }

  .toc-toggle {
    position: fixed;
    z-index: 25;
    right: 12px;
    bottom: 12px;
    display: block;
    padding: 11px 13px;
    color: #090709;
    background: var(--pink-hot);
    border: 2px solid #ffd4e8;
    box-shadow: 5px 5px 0 #240a1a;
    font-size: 10px;
    cursor: pointer;
  }

  .book-main {
    padding: 35px 16px 75px;
  }

  .book-hero {
    min-height: 410px;
    padding-right: 0;
    padding-left: 0;
  }

  .book-hero h1 {
    font-size: clamp(48px, 15vw, 90px);
  }

  .book-content {
    padding-right: 0;
    padding-left: 0;
    font-size: 13px;
  }

  .book-content h2 {
    margin-top: 75px;
  }
}

@media (max-width: 520px) {
  .book-hero::before {
    right: 4px;
    max-width: 165px;
    line-height: 1.4;
  }

  .book-content pre {
    margin-right: -8px;
    margin-left: -8px;
    padding: 20px 13px;
    font-size: 10px;
  }
}