.deepdoc-hero {
  position: relative;
  overflow-x: clip;
  padding-top: clamp(68px, 9vw, 118px);
  padding-bottom: clamp(64px, 8vw, 104px);
  border-bottom: 1px solid var(--line-medium);
}

.deepdoc-hero::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(var(--accent-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--accent-soft) 1px, transparent 1px),
    radial-gradient(circle at 84% 82%, var(--twilight-glow), transparent 25rem);
  background-size: 52px 52px, 52px 52px, auto;
  content: "";
  mask-image: linear-gradient(to bottom, transparent, var(--color-ink) 24%, var(--color-ink));
  opacity: 0.72;
}

.deepdoc-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(340px, 0.72fr);
  align-items: end;
  gap: clamp(40px, 7vw, 92px);
}

.deepdoc-hero-copy {
  max-width: 770px;
}

.deepdoc-hero-copy .eyebrow {
  margin-bottom: 22px;
}

.deepdoc-hero-copy .hero-title {
  max-width: 760px;
}

.deepdoc-summary {
  max-width: 690px;
  margin-bottom: 0;
  color: var(--color-text-soft);
  font-size: clamp(18px, 1.8vw, 22px);
  line-height: 1.8;
}

.deepdoc-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.decision-board {
  position: relative;
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--line-medium);
  border-radius: var(--radius-md);
  background:
    linear-gradient(135deg, var(--accent-soft), transparent 48%),
    var(--color-panel);
  box-shadow: var(--shadow-low), var(--shadow-mid);
}

.decision-board::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 28px;
  border-left: 1px dashed var(--accent-line);
  content: "";
}

.decision-board-label {
  display: block;
  margin-bottom: 18px;
  padding-left: 25px;
  color: var(--color-accent-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.decision-board-row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(78px, 0.55fr) minmax(0, 1.45fr);
  gap: 14px;
  padding: 15px 0 15px 25px;
  border-top: 1px solid var(--line-soft);
}

.decision-board-row::before {
  position: absolute;
  top: 22px;
  left: -4px;
  width: 9px;
  height: 9px;
  border: 2px solid var(--color-panel);
  border-radius: 50%;
  background: var(--color-accent);
  content: "";
  box-shadow: 0 0 0 1px var(--color-accent);
}

.decision-board-row span {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.decision-board-row strong {
  color: var(--color-text);
  font-size: 14px;
}

.deepdoc-intro {
  border-bottom: 1px solid var(--line-soft);
  background: var(--color-bg-soft);
}

.deepdoc-intro .lead {
  max-width: none;
}

.deepdoc-article {
  position: relative;
  padding-top: clamp(48px, 7vw, 82px);
  padding-bottom: clamp(72px, 9vw, 124px);
}

.deepdoc-article .toc-tabs {
  margin-bottom: clamp(56px, 8vw, 94px);
}

.deepdoc-chapter {
  max-width: 920px;
  margin-inline: auto;
  padding-top: 12px;
  padding-bottom: clamp(72px, 10vw, 130px);
  border-bottom: 1px solid var(--line-medium);
}

.deepdoc-chapter:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

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

.deepdoc-chapter h3 {
  margin-top: 2.2em;
  color: var(--color-text);
}

.deepdoc-chapter p {
  font-size: 17px;
  line-height: 1.95;
}

.chapter-label {
  color: var(--color-accent-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.deepdoc-chapter .compare-table-wrap {
  margin-top: 32px;
  margin-bottom: 36px;
}

.deepdoc-chapter pre {
  margin-top: 24px;
  margin-bottom: 28px;
}

.deepdoc-chapter .callout {
  margin-top: 34px;
  margin-bottom: 12px;
}

@media (max-width: 900px) {
  .deepdoc-hero-grid {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .decision-board {
    max-width: 640px;
  }

  .deepdoc-chapter {
    max-width: none;
  }
}

@media (max-width: 640px) {
  .deepdoc-hero {
    padding-top: 52px;
    padding-bottom: 58px;
  }

  .deepdoc-hero::before {
    background-size: 36px 36px, 36px 36px, auto;
  }

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

  .decision-board-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .deepdoc-article {
    padding-top: 38px;
  }

  .deepdoc-chapter {
    padding-bottom: 78px;
  }

  .deepdoc-chapter p {
    font-size: 16px;
    line-height: 1.88;
  }
}