:root {
  --deepdoc-hero-width: 920px;
  --deepdoc-card-min: 180px;
  --deepdoc-index-size: 34px;
  --deepdoc-rule-width: 4px;
}

.deepdoc-hero {
  padding-top: clamp(64px, 9vw, 112px);
  padding-bottom: clamp(42px, 6vw, 72px);
  overflow-x: clip;
  position: relative;
  background:
    radial-gradient(circle at 18% 20%, var(--color-error-glow), transparent 30%),
    radial-gradient(circle at 84% 68%, var(--color-accent-glow), transparent 32%),
    var(--color-bg);
}

.deepdoc-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 48%;
  pointer-events: none;
  background-image:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: linear-gradient(to bottom, transparent, var(--color-text));
  -webkit-mask-image: linear-gradient(to bottom, transparent, var(--color-text));
  opacity: 0.7;
}

.deepdoc-hero .reading-wrap {
  max-width: var(--deepdoc-hero-width);
  position: relative;
  z-index: 1;
  text-align: center;
}

.deepdoc-hero h1 {
  font-size: clamp(48px, 6vw, 72px);
}

.deepdoc-hero .lead {
  max-width: 820px;
  margin-inline: auto;
}

.deepdoc-chips {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 9px;
}

.deepdoc-intro {
  margin-top: 34px;
  text-align: left;
  box-shadow: var(--shadow-card);
}

.deepdoc-intro a,
.deepdoc-body a {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 3px;
}

.deepdoc-toc-section {
  padding-top: 18px;
  padding-bottom: 18px;
  position: relative;
  z-index: 4;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border-soft);
  border-bottom: 1px solid var(--color-border-soft);
}

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

.deepdoc-section {
  scroll-margin-top: calc(var(--nav-height) + 72px);
}

.deepdoc-section .reading-wrap {
  position: relative;
}

.deepdoc-section h2 {
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-border);
}

.deepdoc-section h3 {
  margin-top: 38px;
  font-size: clamp(21px, 2.2vw, 27px);
}

.deepdoc-section p {
  line-height: 1.92;
}

.deepdoc-section .eyebrow + h2 {
  margin-top: 4px;
}

.selection-grid {
  margin: 34px 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(var(--deepdoc-card-min), 1fr));
  gap: 12px;
}

.selection-step {
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  box-shadow: var(--shadow-card);
}

.selection-step h3 {
  margin: 14px 0 8px;
  font-size: 18px;
}

.selection-step p {
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.65;
}

.selection-index {
  width: var(--deepdoc-index-size);
  height: var(--deepdoc-index-size);
  border-radius: var(--radius-pill);
  display: grid;
  place-items: center;
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
}

.deepdoc-section .table-wrap {
  margin: 32px 0;
  background: var(--color-bg);
  box-shadow: var(--shadow-card);
}

.deepdoc-section th {
  color: var(--color-text);
  font-size: 14px;
}

.deepdoc-section td {
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.7;
}

.deepdoc-section pre {
  margin: 32px 0;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-device);
}

.platform-notes {
  margin: 34px 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.platform-notes .card {
  border-top: var(--deepdoc-rule-width) solid var(--color-accent);
}

.platform-notes h3 {
  margin-top: 0;
  font-size: 21px;
}

.compatibility-board {
  margin: 34px 0;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-bg);
  box-shadow: var(--shadow-card);
}

.compatibility-row {
  padding: 24px;
  display: grid;
  grid-template-columns: minmax(190px, 0.42fr) minmax(0, 1fr);
  align-items: center;
  gap: 28px;
}

.compatibility-row + .compatibility-row {
  border-top: 1px solid var(--color-border-soft);
}

.compatibility-row h3 {
  margin: 0;
  font-size: 20px;
}

.compatibility-row p {
  color: var(--color-muted);
}

.deepdoc-conclusion {
  margin-top: 42px;
  border-left-color: var(--color-warn);
  background: var(--color-warn-soft);
  box-shadow: var(--shadow-card);
}

@media (max-width: 980px) {
  .selection-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .deepdoc-hero {
    padding-top: 56px;
  }

  .deepdoc-hero h1 {
    font-size: clamp(34px, 11vw, 48px);
  }

  .deepdoc-toc-section {
    padding-top: 12px;
    padding-bottom: 12px;
  }

  .platform-notes {
    grid-template-columns: 1fr;
  }

  .compatibility-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (max-width: 640px) {
  .deepdoc-chips {
    justify-content: flex-start;
  }

  .deepdoc-intro {
    margin-top: 26px;
  }

  .selection-grid {
    grid-template-columns: 1fr;
  }

  .deepdoc-section p {
    line-height: 1.85;
  }

  .deepdoc-section h3 {
    margin-top: 30px;
  }

  .compatibility-row {
    padding: 20px;
  }
}