:root {
  --deepdoc-hero-space: clamp(72px, 10vw, 126px);
  --deepdoc-reading-space: clamp(58px, 8vw, 92px);
  --deepdoc-section-gap: clamp(78px, 10vw, 118px);
  --deepdoc-code-tracking: 0.12em;
  --deepdoc-lead-size: clamp(17px, 2vw, 20px);
  --deepdoc-orbit-size: clamp(240px, 34vw, 520px);
}

.page-deepdoc {
  background:
    radial-gradient(circle at 88% 8%, var(--color-cyan-wash), transparent 28%),
    radial-gradient(circle at 8% 22%, var(--color-pink-wash), transparent 26%),
    var(--color-bg);
}

.deepdoc-hero {
  position: relative;
  overflow: hidden;
  border-bottom: var(--border-thin) solid var(--color-line-faint);
  padding-top: var(--deepdoc-hero-space);
  padding-bottom: var(--deepdoc-hero-space);
}

.deepdoc-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--color-line-faint) var(--border-thin), transparent var(--border-thin)),
    linear-gradient(90deg, var(--color-line-faint) var(--border-thin), transparent var(--border-thin));
  background-size: 72px 72px;
  opacity: 0.24;
  transform: perspective(520px) rotateX(64deg) scale(1.5) translateY(28%);
  transform-origin: center bottom;
}

.deepdoc-hero-inner {
  position: relative;
  z-index: 2;
  text-align: center;
}

.deepdoc-hero h1 {
  max-width: 820px;
  margin: 24px auto 20px;
}

.deepdoc-lead {
  max-width: 760px;
  margin: 0 auto;
  color: var(--color-muted);
  font-size: var(--deepdoc-lead-size);
  line-height: 1.9;
}

.deepdoc-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-top: 30px;
}

.deepdoc-facts {
  display: flex;
  max-width: 900px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 28px auto 0;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.deepdoc-facts span {
  position: relative;
}

.deepdoc-facts span + span::before {
  content: "×";
  position: absolute;
  right: calc(100% + 8px);
  color: var(--color-warning);
}

.deepdoc-orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  width: var(--deepdoc-orbit-size);
  height: var(--deepdoc-orbit-size);
  border: var(--border-thin) dashed var(--color-line-soft);
  border-radius: var(--radius-pill);
  opacity: 0.42;
  pointer-events: none;
  transform: translate(-50%, -50%) rotate(-12deg);
}

.deepdoc-orbit::before,
.deepdoc-orbit::after {
  content: "";
  position: absolute;
  border-radius: var(--radius-pill);
}

.deepdoc-orbit::before {
  inset: 18%;
  border: var(--border-thin) solid var(--color-line-faint);
}

.deepdoc-orbit::after {
  top: 8%;
  left: 50%;
  width: 10px;
  height: 10px;
  background: var(--color-accent);
  box-shadow: var(--shadow-pink);
}

.orbit-mark {
  position: absolute;
  color: var(--color-line);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: var(--deepdoc-code-tracking);
  white-space: nowrap;
}

.orbit-mark-a {
  top: 4%;
  right: 80%;
}

.orbit-mark-b {
  bottom: 18%;
  left: 88%;
}

.deepdoc-intro {
  padding-top: 42px;
}

.deepdoc-intro .callout {
  max-width: 920px;
  margin-inline: auto;
}

.deepdoc-intro a {
  color: var(--color-line);
  text-decoration: underline;
  text-decoration-color: var(--color-line-soft);
  text-underline-offset: 0.2em;
}

.deepdoc-toc-wrap {
  padding-top: 24px;
  padding-bottom: 20px;
}

.deepdoc-toc-wrap .toc-tabs {
  justify-content: center;
}

.deepdoc-article {
  max-width: calc(880px + var(--gutter) * 2);
  padding-top: var(--deepdoc-reading-space);
  padding-bottom: var(--deepdoc-reading-space);
}

.deepdoc-article section {
  padding-top: 10px;
}

.deepdoc-article section + section {
  margin-top: var(--deepdoc-section-gap);
  border-top: var(--border-thin) solid var(--color-line-faint);
  padding-top: var(--deepdoc-section-gap);
}

.deepdoc-article h2 {
  margin-top: 12px;
}

.deepdoc-article h3 {
  position: relative;
  margin-top: 2em;
  padding-left: 18px;
}

.deepdoc-article h3::before {
  content: "";
  position: absolute;
  top: 0.24em;
  bottom: 0.18em;
  left: 0;
  width: 4px;
  border-radius: var(--radius-xs);
  background: var(--color-warning);
}

.deepdoc-article p,
.deepdoc-article li {
  color: var(--color-muted);
}

.deepdoc-article strong {
  color: var(--color-text);
}

.deepdoc-article .table-scroll {
  margin-top: 28px;
  margin-bottom: 30px;
}

.deepdoc-article .callout {
  margin-top: 30px;
  margin-bottom: 30px;
}

.chapter-code {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: var(--deepdoc-code-tracking);
}

.chapter-code::before {
  content: "";
  width: 28px;
  height: var(--border-thin);
  background: var(--color-warning);
}

.ticket-checklist {
  display: grid;
  gap: 10px;
  margin: 26px 0 30px;
  padding-left: 0;
  list-style: none;
}

.ticket-checklist li {
  position: relative;
  border: var(--border-thin) solid var(--color-line-soft);
  border-radius: var(--radius-control);
  background: var(--color-panel);
  padding: 15px 18px 15px 42px;
}

.ticket-checklist li::before {
  content: "✓";
  position: absolute;
  top: 15px;
  left: 17px;
  color: var(--color-success);
  font-family: var(--font-mono);
  font-weight: 800;
}

@media (max-width: 768px) {
  .deepdoc-hero {
    padding-top: 62px;
    padding-bottom: 62px;
  }

  .deepdoc-actions {
    width: 100%;
    flex-direction: column;
  }

  .deepdoc-actions .btn {
    width: 100%;
    max-width: 340px;
  }

  .deepdoc-facts {
    align-items: stretch;
    flex-direction: column;
    gap: 7px;
  }

  .deepdoc-facts span + span::before {
    display: none;
  }

  .deepdoc-orbit {
    opacity: 0.2;
  }

  .orbit-mark {
    display: none;
  }

  .deepdoc-toc-wrap .toc-tabs {
    justify-content: flex-start;
  }

  .deepdoc-article section + section {
    margin-top: 76px;
    padding-top: 76px;
  }
}

@media (max-width: 420px) {
  .deepdoc-hero::before {
    background-size: 48px 48px;
  }

  .deepdoc-article h3 {
    padding-left: 14px;
  }

  .ticket-checklist li {
    padding-right: 14px;
    padding-left: 38px;
  }
}