.deepdoc-hero {
  padding-top: clamp(72px, 9vw, 118px);
  padding-bottom: 34px;
  overflow-x: clip;
  background: var(--color-page);
  color: var(--color-ink);
}

.deepdoc-hero__copy {
  position: relative;
  text-align: center;
}

.deepdoc-hero__copy::before,
.deepdoc-hero__copy::after {
  position: absolute;
  pointer-events: none;
  color: var(--color-sketch);
  font-family: var(--font-mono);
  line-height: 1;
  opacity: 0.6;
}

.deepdoc-hero__copy::before {
  top: 8px;
  left: 1%;
  content: "✦";
  font-size: 25px;
  transform: rotate(-9deg);
}

.deepdoc-hero__copy::after {
  right: 3%;
  bottom: 14px;
  content: "⌁";
  font-size: 44px;
  transform: rotate(6deg);
}

.deepdoc-hero h1 {
  max-width: 760px;
  margin-inline: auto;
}

.deepdoc-title-mark {
  position: relative;
  display: inline-block;
  white-space: nowrap;
}

.deepdoc-title-mark::after {
  position: absolute;
  right: 3%;
  bottom: -8px;
  left: 2%;
  height: 5px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
  transform: rotate(-1.2deg);
}

.deepdoc-lead {
  max-width: 730px;
  margin: 0 auto;
  color: var(--color-muted);
  font-size: clamp(17px, 1.8vw, 21px);
  line-height: 1.9;
}

.deepdoc-facts {
  margin-top: 27px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 28px;
}

.deepdoc-facts span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--color-muted);
  font: 12px/1.6 var(--font-mono);
}

.deepdoc-facts span::before {
  width: 6px;
  height: 6px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.deepdoc-facts b {
  color: var(--color-ink);
}

.deepdoc-intro {
  margin-top: 52px;
  box-shadow: var(--shadow-card);
}

.deepdoc-intro p {
  color: var(--color-muted);
}

.deepdoc-body {
  padding-top: 26px;
}

.chapter {
  padding-top: 82px;
  padding-bottom: 62px;
  scroll-margin-top: calc(var(--header-height) + 18px);
}

.chapter + .chapter {
  border-top: 1px solid var(--color-line);
}

.chapter-heading {
  margin-bottom: 42px;
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  align-items: start;
  gap: 20px;
}

.chapter-heading h2 {
  margin-bottom: 10px;
}

.chapter-heading p {
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: 17px;
}

.chapter-index {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  background: var(--color-accent);
  color: var(--color-on-dark);
  box-shadow: 0 12px 28px -14px var(--color-accent-shadow);
  font: 750 14px/1 var(--font-mono);
}

.chapter h3 {
  margin-top: 2.1em;
}

.chapter p,
.chapter li,
.chapter td {
  line-height: 1.9;
}

.chapter .table-scroll {
  margin-top: 30px;
  margin-bottom: 34px;
  box-shadow: 0 10px 30px var(--color-shadow-soft);
}

.chapter .data-table {
  margin-bottom: 0;
  background: var(--color-page);
  color: var(--color-ink);
}

.chapter pre {
  margin-top: 28px;
  margin-bottom: 30px;
  box-shadow: var(--shadow-card);
}

.chapter-checklist {
  margin-top: 38px;
  margin-bottom: 38px;
  padding: clamp(24px, 4vw, 36px);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  color: var(--color-ink);
}

.chapter-checklist h3 {
  margin-top: 0;
}

.chapter-checklist ul {
  margin-bottom: 0;
  display: grid;
  gap: 9px;
}

.chapter-checklist li::marker {
  color: var(--color-accent);
}

.deepdoc-body .end-download-card {
  margin-top: 88px;
}

.deepdoc-body .end-download-card .button-row {
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .deepdoc-hero {
    padding-top: 68px;
  }

  .deepdoc-hero__copy::before,
  .deepdoc-hero__copy::after {
    display: none;
  }

  .deepdoc-lead {
    font-size: 17px;
  }

  .chapter {
    padding-top: 72px;
    padding-bottom: 48px;
  }

  .chapter-heading {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 14px;
  }

  .chapter-index {
    width: 48px;
    height: 48px;
  }

  .chapter-heading p {
    font-size: 15px;
  }
}

@media (max-width: 480px) {
  .deepdoc-title-mark {
    white-space: normal;
  }

  .deepdoc-facts {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .chapter-heading {
    grid-template-columns: minmax(0, 1fr);
  }

  .chapter-index {
    width: 44px;
    height: 36px;
  }

  .chapter pre {
    padding: 17px;
    font-size: 12px;
  }
}