/* Epoch Engine: JavaScript's history as a machine advancing through editions.
   Violet night, JS yellow, and condensed display type, matching the series covers. */

[data-ob-theme="epoch-engine"] {
  --ee-violet: #8b7bff;
  --ee-rail: #3d3666;
}

@media (prefers-color-scheme: light) {
  [data-ob-theme="epoch-engine"] {
    --ee-violet: #4b36c9;
    --ee-rail: #c9c1e3;
  }
}

[data-ob-theme="epoch-engine"] body {
  background-image:
    radial-gradient(ellipse 80% 50% at 15% -10%, var(--ob-color-glow), transparent 70%),
    linear-gradient(var(--ee-rail) 1px, transparent 1px);
  background-size: auto, 100% 120px;
  background-repeat: no-repeat, repeat;
  background-attachment: fixed, scroll;
}

@media (prefers-color-scheme: dark) {
  [data-ob-theme="epoch-engine"] body {
    background-image: radial-gradient(ellipse 80% 50% at 15% -10%, var(--ob-color-glow), transparent 70%);
  }
}

[data-ob-theme="epoch-engine"] .ob-header {
  font-family: var(--ob-font-mono);
}

[data-ob-theme="epoch-engine"] .ob-header-inner {
  margin-bottom: 1.5rem;
}

/* Titles: tall, condensed, all caps, like the cover headlines. */
[data-ob-theme="epoch-engine"] .ob-title {
  color: var(--ob-color-text);
  font-weight: 900;
  line-height: 0.95;
  text-transform: uppercase;
  text-wrap: balance;
}

[data-ob-theme="epoch-engine"] .ob-post-title {
  text-align: left;
}

[data-ob-theme="epoch-engine"] .ob-section > .ob-section-heading .ob-title {
  color: var(--ob-color-accent-soft);
}

/* "Part 3 of 8" becomes the yellow edition tag from the covers. */
.ee-article-label,
[data-ob-theme="epoch-engine"] .ob-eyebrow {
  font: 700 0.75rem / 1.6 var(--ob-font-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.ee-article-label {
  display: inline-block;
  margin-block: 0 1rem;
  padding: 0.2rem 0.65rem;
  border-radius: var(--ob-radius-sm);
  color: var(--ob-color-accent-contrast);
  background: var(--ob-color-accent);
}

[data-ob-theme="epoch-engine"] .ob-eyebrow {
  color: var(--ob-color-accent-soft);
}

[data-ob-theme="epoch-engine"] .ob-tags a {
  border-color: var(--ob-color-border);
  border-radius: var(--ob-radius-sm);
  color: var(--ob-color-muted);
  font-family: var(--ob-font-mono);
}

[data-ob-theme="epoch-engine"] .ob-tags a:hover {
  border-color: var(--ob-color-accent-border);
  color: var(--ob-color-accent-soft);
}

/* Article headings: section titles in display caps, sub-sections quieter. */
[data-ob-theme="epoch-engine"] .ob-prose h2 {
  color: var(--ob-color-accent-soft);
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  font-weight: 800;
  text-transform: uppercase;
}

[data-ob-theme="epoch-engine"] .ob-prose h3 {
  color: var(--ob-color-text);
  font-size: clamp(1.45rem, 3vw, 1.9rem);
  font-weight: 700;
}

[data-ob-theme="epoch-engine"] .ob-prose a {
  color: var(--ob-color-link);
}

[data-ob-theme="epoch-engine"] .ob-prose :not(pre) > code {
  color: var(--ob-color-accent-soft);
}

[data-ob-theme="epoch-engine"] .ob-prose blockquote {
  border-left-color: var(--ee-violet);
}

/* Code: the cover's editor window, with a yellow file marker in the title bar. */
[data-ob-theme="epoch-engine"] .ob-prose pre {
  padding: 1.1rem;
  border-color: var(--ob-color-border);
  border-radius: var(--ob-radius-sm);
  font-size: 0.85rem;
  line-height: 1.8;
}

[data-ob-theme="epoch-engine"] .ob-code-block {
  overflow: hidden;
  border: 1px solid var(--ob-color-border);
  border-radius: var(--ob-radius);
  background: var(--ob-color-code-bg);
}

[data-ob-theme="epoch-engine"] .ob-code-block pre {
  border: 0;
  border-radius: 0;
}

[data-ob-theme="epoch-engine"] .ob-code-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 1rem;
  border: 0;
  border-bottom: 1px solid var(--ob-color-border);
  border-radius: 0;
  color: #f6f2e8;
  font: 700 0.7rem / 1.6 var(--ob-font-mono);
  letter-spacing: 0.06em;
}

[data-ob-theme="epoch-engine"] .ob-code-title::before {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: #f7df1e;
}

[data-ob-theme="epoch-engine"] .ob-series-box {
  border-left: 3px solid var(--ob-color-accent);
}

/* Home and listing cards that lead into the series pick up the violet surface. */
.ob-card[data-ob-theme="epoch-engine"] {
  border-color: var(--ee-rail);
}