/* Styles for /datamine/about/ */
.page--datamine-about {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.about-layout {
  --dm-about-rail-width: 240px;
  --dm-about-gap: 44px;
  max-width: var(--dm-about-max, 1380px);
  margin: 0 auto;
  padding: 24px 24px 64px;
  width: 100%;
}

.about-container {
  display: grid;
  grid-template-columns: var(--dm-about-rail-width, 240px) minmax(0, 1fr) var(--dm-about-rail-width, 240px);
  gap: var(--dm-about-gap, 44px);
  width: 100%;
  align-items: start;
}

.about-article {
  grid-column: 2;
  min-width: 0;
  width: 100%;
}

/* Hero Section */
.about-hero {
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--dm-border, rgba(255, 255, 255, 0.08));
  scroll-margin-top: 92px;
}

.about-hero__eyebrow {
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dm-gold, #f5d97a);
  margin: 0 0 10px;
}

.about-hero__title {
  font-family: var(--dm-font-display, "Spectral", serif);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 500;
  line-height: 1.15;
  color: var(--dm-text-strong, #f4f0f6);
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

.about-hero__subtitle {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 16px;
  line-height: 1.55;
  color: var(--dm-text, #d7d0dd);
  margin: 0;
  max-width: var(--dm-prose-max, 74ch);
}

/* Data Snapshot Strip */
.about-snapshot {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 10px 24px;
  padding: 12px 0;
  margin-bottom: 28px;
  border-top: 1px solid var(--dm-border, rgba(255, 255, 255, 0.08));
  border-bottom: 1px solid var(--dm-border, rgba(255, 255, 255, 0.08));
  background: transparent;
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 12px;
  color: var(--dm-muted, #918899);
}

.about-snapshot__header {
  display: flex;
  align-items: center;
  padding-top: 2px;
}

.about-snapshot__label {
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--dm-gold, #f5d97a);
  text-transform: uppercase;
  font-size: 11px;
  white-space: nowrap;
}

.about-snapshot__grid {
  display: grid;
  grid-template-columns: minmax(180px, auto) 1fr;
  gap: 6px 32px;
  align-items: baseline;
}

.about-snapshot__item {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  min-width: 0;
}

.about-snapshot__key {
  color: var(--dm-muted, #918899);
  white-space: nowrap;
  font-size: 11.5px;
}

.about-snapshot__val {
  color: var(--dm-text-strong, #f4f0f6);
  font-weight: 600;
  font-size: 12px;
  word-break: break-word;
}

@media (max-width: 768px) {
  .about-snapshot {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .about-snapshot__grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

/* Sticky Desktop Table of Contents */
.about-sidebar {
  grid-column: 3;
  width: 100%;
  max-width: var(--dm-about-rail-width, 240px);
  position: sticky;
  top: 92px;
  height: fit-content;
  display: block;
}

.about-toc {
  display: flex;
  flex-direction: column;
}

.about-toc__title {
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dm-muted, #918899);
  margin-bottom: 12px;
  opacity: 0.9;
}

.about-toc__links {
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-left: 1px solid var(--dm-border, rgba(255, 255, 255, 0.08));
  padding-left: 12px;
}

.about-toc__group-label {
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dm-gold, #f5d97a);
  margin-top: 10px;
  margin-bottom: 2px;
  opacity: 0.85;
}

.about-toc__group-label:first-child {
  margin-top: 0;
}

.about-toc__link {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 13px;
  color: var(--dm-muted, #918899);
  text-decoration: none;
  line-height: 1.35;
  transition: color 0.15s ease;
}

.about-toc__link:hover {
  color: var(--dm-text-strong, #f4f0f6);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.about-toc__link--active {
  color: var(--dm-text-strong, #f4f0f6);
  font-weight: 600;
}

/* Mobile & Tablet Inline TOC */
.about-inline-toc {
  display: none;
  margin-bottom: 32px;
  padding: 12px 0 16px;
  border-bottom: 1px solid var(--dm-border, rgba(255, 255, 255, 0.08));
}

.about-inline-toc__title {
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--dm-muted, #918899);
  display: block;
  margin-bottom: 8px;
}

.about-inline-toc__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
}

.about-inline-toc__links a {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 13px;
  color: var(--dm-muted, #918899);
  text-decoration: none;
  transition: color 0.15s ease;
}

.about-inline-toc__links a:hover {
  color: var(--dm-text-strong, #f4f0f6);
  text-decoration: underline;
}

/* Section Containers & Scroll Margins */
.about-section {
  margin-bottom: 48px;
  scroll-margin-top: 92px;
}

.about-section + .about-section {
  border-top: 1px solid rgba(255, 255, 255, 0.13);
  padding-top: 40px;
}

[data-theme="light"] .about-section + .about-section,
[data-color-scheme="light"] .about-section + .about-section {
  border-top-color: rgba(0, 0, 0, 0.12);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]):not([data-color-scheme="dark"]) .about-section + .about-section {
    border-top-color: rgba(0, 0, 0, 0.12);
  }
}

.about-section__header {
  margin-bottom: 14px;
}

.about-section__title {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 21px;
  font-weight: 700;
  color: var(--dm-text-strong, #f4f0f6);
  margin: 0 0 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Permalink Anchor */
.about-anchor-link {
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 15px;
  font-weight: 400;
  color: var(--dm-muted, #918899);
  text-decoration: none;
  opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease;
  user-select: none;
  padding: 0 4px;
}

.about-section__title:hover .about-anchor-link,
.about-section__title:focus-within .about-anchor-link,
.about-anchor-link:focus {
  opacity: 0.6;
}

.about-anchor-link:hover {
  opacity: 1;
  color: var(--dm-gold, #f5d97a);
}

.about-prose {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 15px;
  line-height: 1.65;
  color: var(--dm-text, #d7d0dd);
}

.about-prose p,
.about-section > p {
  max-width: var(--dm-prose-max, 74ch);
  margin: 0 0 14px;
}

.about-prose p:last-child {
  margin-bottom: 0;
}

/* Data Type Legend */
.about-legend {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 20px 0;
  padding: 14px 16px;
  background: var(--dm-surface, #100d14);
  border: 1px solid var(--dm-border, rgba(255, 255, 255, 0.08));
  border-radius: var(--dm-radius-sm, 6px);
}

.about-legend__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 13.5px;
  line-height: 1.4;
}

.about-legend__label {
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  min-width: 100px;
  flex-shrink: 0;
}

.about-legend__label--game {
  color: var(--dm-gold, #f5d97a);
}

.about-legend__label--calculated {
  color: var(--dm-violet, #a77add);
}

.about-legend__label--curated {
  color: var(--dm-text-strong, #f4f0f6);
}

.about-legend__desc {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  color: var(--dm-muted, #918899);
}

/* Provenance In-Section Tags */
.about-provenance-strip {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin: 12px 0 16px;
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.about-tag--game {
  color: var(--dm-gold, #f5d97a);
}

.about-tag--calculated {
  color: var(--dm-violet, #a77add);
}

.about-tag--curated {
  color: var(--dm-text-strong, #f4f0f6);
}

.about-tag--output {
  color: #8ce8ff;
}

.about-tag--intermediate {
  color: #ffaa55;
}

.about-tag-sep {
  color: var(--dm-border, rgba(255, 255, 255, 0.2));
}

/* Structured Source List */
.about-source-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 12px 0 16px;
}

.about-source-row {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 8px 12px;
  background: var(--dm-surface, #100d14);
  border: 1px solid var(--dm-border, rgba(255, 255, 255, 0.08));
  border-radius: var(--dm-radius-sm, 6px);
  font-size: 13px;
}

.about-source-row__label {
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  font-weight: 700;
  color: var(--dm-gold, #f5d97a);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.about-source-row__content {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.about-source-row__file {
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 12px;
  color: var(--dm-text-strong, #f4f0f6);
  word-break: break-all;
}

.about-source-row__desc {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 12.5px;
  color: var(--dm-muted, #918899);
  line-height: 1.4;
}

@media (max-width: 600px) {
  .about-source-row {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 8px 10px;
  }
}

/* Structured Provenance Grid */
.about-provenance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
  margin: 14px 0 16px;
}

.about-provenance-col {
  padding: 10px 12px;
  background: var(--dm-surface, #100d14);
  border: 1px solid var(--dm-border, rgba(255, 255, 255, 0.08));
  border-radius: var(--dm-radius-sm, 6px);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.about-provenance-col__tag {
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.about-provenance-col__text {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 12.5px;
  color: var(--dm-text, #d7d0dd);
  line-height: 1.4;
  margin: 0;
}

/* Glossary / Terminology */
.about-glossary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
  margin: 18px 0;
}

.about-glossary__card {
  padding: 14px 16px;
  background: var(--dm-surface, #100d14);
  border: 1px solid var(--dm-border, rgba(255, 255, 255, 0.08));
  border-radius: var(--dm-radius-md, 8px);
}

.about-glossary__term {
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 13px;
  font-weight: 700;
  color: var(--dm-gold, #f5d97a);
  margin-bottom: 5px;
}

.about-glossary__desc {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--dm-text, #d7d0dd);
}

/* Two Ways Grid */
.about-two-ways {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin: 20px 0;
  padding: 16px 0;
  border-top: 1px solid var(--dm-border, rgba(255, 255, 255, 0.08));
  border-bottom: 1px solid var(--dm-border, rgba(255, 255, 255, 0.08));
}

.about-way-col {
  display: flex;
  flex-direction: column;
}

.about-way-col__header {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 4px;
}

.about-way-col__title {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--dm-text-strong, #f4f0f6);
  margin: 0;
}

.about-way-col__tagline {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 13px;
  color: var(--dm-muted, #918899);
  margin-bottom: 10px;
}

.about-way-col__desc {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 14px;
  line-height: 1.55;
  color: var(--dm-text, #d7d0dd);
  margin: 0;
}

/* Vertical Process Timeline */
.about-timeline {
  display: flex;
  flex-direction: column;
  margin: 20px 0 28px;
  padding-left: 2px;
}

.about-timeline-step {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 16px;
  position: relative;
}

.about-timeline-step__marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 5px;
}

.about-timeline-step__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--dm-gold, #f5d97a);
  flex-shrink: 0;
  box-shadow: 0 0 8px rgba(245, 217, 122, 0.3);
}

.about-timeline-step__line {
  flex: 1;
  width: 1px;
  background: var(--dm-border, rgba(255, 255, 255, 0.12));
  margin: 6px 0;
  min-height: 24px;
}

.about-timeline-step:last-child .about-timeline-step__line {
  display: none;
}

.about-timeline-step__body {
  padding-bottom: 18px;
}

.about-timeline-step__title {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 14.5px;
  font-weight: 700;
  color: var(--dm-text-strong, #f4f0f6);
  margin: 0 0 3px;
  letter-spacing: 0.02em;
}

.about-timeline-step__desc {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--dm-text, #d7d0dd);
  margin: 0;
}

/* Structured Data Trace Flow */
.about-trace-flow {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 10px 0;
}

.about-trace-flow__section {
  padding: 12px 14px;
  background: var(--dm-surface-raised, #151119);
  border: 1px solid var(--dm-border, rgba(255, 255, 255, 0.08));
  border-radius: var(--dm-radius-md, 8px);
}

.about-trace-flow__section-title {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dm-gold, #f5d97a);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.about-trace-flow__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.about-trace-flow__item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 13px;
  padding: 4px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.about-trace-flow__item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.about-trace-flow__code {
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 12px;
  color: var(--dm-text-strong, #f4f0f6);
  word-break: break-all;
}

.about-trace-flow__desc {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 12.5px;
  color: var(--dm-muted, #918899);
  line-height: 1.4;
}

.about-trace-flow__details {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 13px;
}

.about-trace-flow__meta-row {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.45;
}

.about-trace-flow__meta-key {
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  font-weight: 700;
  color: var(--dm-gold, #f5d97a);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.about-trace-flow__meta-val {
  color: var(--dm-text, #d7d0dd);
  font-size: 13px;
}

.about-trace-flow__consumer-row {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 13px;
  color: var(--dm-text, #d7d0dd);
}

/* Native Details Disclosure */
.about-details {
  margin: 16px 0;
  border: 1px solid var(--dm-border, rgba(255, 255, 255, 0.08));
  border-radius: var(--dm-radius-md, 8px);
  background: var(--dm-surface, #100d14);
  overflow: hidden;
}

.about-details summary {
  padding: 11px 15px;
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 13px;
  font-weight: 600;
  color: var(--dm-text, #d7d0dd);
  cursor: pointer;
  user-select: none;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.about-details summary:hover {
  background: var(--dm-surface-raised, #151119);
  color: var(--dm-text-strong, #f4f0f6);
}

.about-details summary::-webkit-details-marker {
  display: none;
}

.about-details summary::after {
  content: "▾";
  font-size: 12px;
  color: var(--dm-muted, #918899);
  transition: transform 0.2s ease;
}

.about-details[open] summary::after {
  transform: rotate(180deg);
}

.about-details__body {
  padding: 14px 16px;
  border-top: 1px solid var(--dm-border, rgba(255, 255, 255, 0.08));
  background: rgba(0, 0, 0, 0.2);
  font-size: 13px;
  line-height: 1.6;
}

/* Code Snippets & Formulas */
.about-code-block {
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 12px;
  line-height: 1.5;
  background: #09070d;
  border: 1px solid var(--dm-border, rgba(255, 255, 255, 0.08));
  border-radius: var(--dm-radius-sm, 6px);
  padding: 12px 14px;
  margin: 12px 0;
  overflow-x: auto;
  color: var(--dm-text, #d7d0dd);
}

.about-formula {
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 13px;
  padding: 11px 14px;
  background: rgba(167, 122, 221, 0.07);
  border: 1px solid rgba(167, 122, 221, 0.25);
  border-radius: var(--dm-radius-sm, 6px);
  color: #ebd7ff;
  margin: 12px 0;
  line-height: 1.6;
}

/* What We Do Not Do */
.about-not-do-block {
  margin: 16px 0;
  border-left: 2px solid var(--dm-negative, #df899b);
  padding-left: 18px;
}

.about-not-do-item {
  padding: 9px 0;
  border-bottom: 1px solid var(--dm-border, rgba(255, 255, 255, 0.05));
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 14px;
  line-height: 1.55;
  color: var(--dm-text, #d7d0dd);
}

.about-not-do-item:last-child {
  border-bottom: none;
}

.about-not-do-item strong {
  color: var(--dm-text-strong, #f4f0f6);
}

/* Sources & Tools Links */
.about-sources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
  margin: 16px 0;
}

.about-source-card {
  padding: 16px 18px;
  background: var(--dm-surface, #100d14);
  border: 1px solid var(--dm-border, rgba(255, 255, 255, 0.08));
  border-radius: var(--dm-radius-md, 8px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 12px;
}

.about-source-card__title {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 15px;
  font-weight: 700;
  color: var(--dm-text-strong, #f4f0f6);
  margin: 0 0 4px;
}

.about-source-card__desc {
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 13px;
  color: var(--dm-muted, #918899);
  line-height: 1.45;
  margin: 0;
}

.about-source-card__link {
  font-family: var(--dm-font-mono, "JetBrains Mono", monospace);
  font-size: 12px;
  color: var(--dm-text, #d7d0dd);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  align-self: flex-start;
  transition: color 0.15s ease;
}

.about-source-card__link:hover {
  color: var(--dm-gold, #f5d97a);
  text-decoration: underline;
}

/* Disclaimer */
.about-disclaimer {
  max-width: var(--dm-prose-max, 74ch);
  margin-top: 48px;
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--dm-border, rgba(255, 255, 255, 0.06));
  border-radius: var(--dm-radius-md, 8px);
  font-family: var(--dm-font-ui, "Barlow", sans-serif);
  font-size: 13px;
  line-height: 1.55;
  color: var(--dm-muted, #918899);
}

.about-disclaimer strong {
  color: var(--dm-text, #d7d0dd);
}

/* Responsive Breakpoints */
@media (max-width: 1260px) and (min-width: 1061px) {
  .about-layout {
    --dm-about-rail-width: 200px;
    --dm-about-gap: 28px;
    padding: 20px 20px 64px;
  }
}

@media (max-width: 1060px) {
  .about-container {
    display: block;
    gap: 0;
  }

  .about-article {
    grid-column: auto;
    width: 100%;
    max-width: 100%;
  }

  .about-sidebar {
    display: none;
  }

  .about-inline-toc {
    display: block;
  }
}

@media (max-width: 680px) {
  .about-layout {
    padding: 16px 14px 48px;
  }

  .about-two-ways {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .about-trace__step {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .about-legend__item {
    flex-direction: column;
    gap: 2px;
  }

  .about-snapshot {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .about-snapshot__sep {
    display: none;
  }
}