/* ══════════════════════════════════════════════════════════════════════════
   ABOUT PAGE — METHODOLOGY
   ══════════════════════════════════════════════════════════════════════════ */

.about-wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.about-wrap h1 {
  font-family: var(--heading, 'Barlow Condensed', sans-serif);
  font-size: 48px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -1px;
  margin-bottom: 8px;
}

.about-intro {
  font-size: 15px;
  line-height: 1.7;
  color: var(--dim, #999);
  margin-bottom: 32px;
  max-width: 640px;
}

.about-wrap h2 {
  font-family: var(--heading, 'Barlow Condensed', sans-serif);
  font-size: 24px;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--fg, #eee);
  margin: 48px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--bg3, #1a1a1a);
}

.about-wrap h3 {
  font-family: var(--heading, 'Barlow Condensed', sans-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--amber, #FFAA00);
  margin: 24px 0 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.about-wrap p {
  font-family: var(--body, 'Barlow', sans-serif);
  font-size: 14px;
  line-height: 1.75;
  color: var(--dim, #999);
  margin-bottom: 14px;
}

.about-wrap ul, .about-wrap ol {
  font-family: var(--body, 'Barlow', sans-serif);
  font-size: 14px;
  line-height: 1.75;
  color: var(--dim, #999);
  padding-left: 20px;
  margin-bottom: 16px;
}

.about-wrap li { margin-bottom: 6px; }
.about-wrap li strong { color: var(--fg, #eee); }
.about-wrap a { color: var(--green, #00FF66); text-decoration: none; }
.about-wrap a:hover { text-decoration: underline; }
.about-back { display: inline-block; margin-bottom: 24px; font-family: var(--mono, 'Space Mono', monospace); font-size: 12px; }

/* ══════════════════════════════════════════════════════════════════════════
   FORMULA RENDERING — mathematical style
   ══════════════════════════════════════════════════════════════════════════ */

.formula {
  display: block;
  margin: 16px 0 20px;
  padding: 20px 24px;
  background: transparent;
  border-left: 3px solid var(--bg3, #1a1a1a);
  font-family: 'Cambria Math', 'Latin Modern Math', 'STIX Two Math', Georgia, serif;
  font-size: 16px;
  line-height: 2;
  color: var(--fg, #eee);
  overflow-x: auto;
}

.formula .var {
  font-style: italic;
  color: var(--fg, #eee);
}

.formula .fn {
  font-variant: small-caps;
  font-style: normal;
  color: var(--dim, #999);
}

.formula .op {
  font-style: normal;
  color: var(--dim, #666);
  padding: 0 4px;
}

.formula .eq {
  font-style: normal;
  color: var(--amber, #FFAA00);
  padding: 0 6px;
}

.formula .label {
  font-family: var(--body, 'Barlow', sans-serif);
  font-size: 12px;
  color: #555;
  font-style: normal;
  display: block;
  margin-top: 4px;
}

.formula sub {
  font-size: 0.7em;
  color: var(--dim, #999);
}

.formula .frac {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  vertical-align: middle;
  margin: 0 4px;
  line-height: 1.2;
}

.formula .frac-num {
  border-bottom: 1px solid var(--dim, #666);
  padding: 0 6px 2px;
  font-size: 0.9em;
}

.formula .frac-den {
  padding: 2px 6px 0;
  font-size: 0.9em;
}

/* ══════════════════════════════════════════════════════════════════════════
   WORKFLOW GRAPH — connected node visualization
   ══════════════════════════════════════════════════════════════════════════ */

.workflow {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 24px 0 32px;
  padding: 0;
}

/* Single node */
.wf-node {
  position: relative;
  flex: 0 0 calc(20% - 2px);
  display: flex;
  align-items: stretch;
}

.wf-card {
  flex: 1;
  padding: 14px 12px;
  border: 1px solid var(--node-color, var(--bg3, #1a1a1a));
  margin: 1px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}

.wf-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--node-color, var(--bg3));
}

.wf-num {
  font-family: var(--mono, 'Space Mono', monospace);
  font-size: 9px;
  font-weight: 700;
  color: var(--node-color, #555);
  letter-spacing: 1px;
  opacity: 0.7;
}

.wf-title {
  font-family: var(--heading, 'Barlow Condensed', sans-serif);
  font-size: 13px;
  font-weight: 700;
  color: var(--fg, #eee);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  line-height: 1.3;
}

.wf-sub {
  font-family: var(--mono, 'Space Mono', monospace);
  font-size: 9px;
  color: #555;
  line-height: 1.3;
}

/* Connector arrow between nodes */
.wf-node:not(:nth-child(5n))::after {
  content: '';
  position: absolute;
  right: -2px;
  top: 50%;
  width: 4px;
  height: 1px;
  background: var(--bg3, #1a1a1a);
  z-index: 1;
}

/* Row break arrow (between row 1 and row 2) */
.wf-row-break {
  flex: 0 0 100%;
  height: 24px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: calc(10% - 1px);
}

.wf-row-break::before {
  content: '↓';
  font-family: var(--mono, 'Space Mono', monospace);
  font-size: 14px;
  color: var(--bg3, #1a1a1a);
}

/* Legend */
.wf-legend {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin: 8px 0 16px;
}

.wf-legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono, 'Space Mono', monospace);
  font-size: 10px;
  color: #555;
}

.wf-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* Responsive */
@media (max-width: 700px) {
  .wf-node {
    flex: 0 0 calc(50% - 2px);
  }
  .wf-node:not(:nth-child(5n))::after {
    display: none;
  }
  .wf-node:nth-child(odd):not(:last-child)::after {
    content: '';
    display: block;
    position: absolute;
    right: -2px;
    top: 50%;
    width: 4px;
    height: 1px;
    background: var(--bg3, #1a1a1a);
    z-index: 1;
  }
  .wf-row-break { display: none; }
}

@media (max-width: 480px) {
  .wf-node {
    flex: 0 0 100%;
  }
  .wf-node::after { display: none !important; }
  .about-wrap h1 { font-size: 36px; }
}

/* ══════════════════════════════════════════════════════════════════════════
   DATASETS TABLE
   ══════════════════════════════════════════════════════════════════════════ */

.ds-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-family: var(--body, 'Barlow', sans-serif);
  font-size: 13px;
}

.ds-table thead th {
  font-family: var(--mono, 'Space Mono', monospace);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--dim, #666);
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--bg3, #1a1a1a);
}

.ds-table tbody td {
  padding: 10px 12px;
  color: var(--dim, #999);
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  vertical-align: top;
}

.ds-table tbody td strong {
  color: var(--fg, #eee);
  font-family: var(--mono, 'Space Mono', monospace);
  font-size: 11px;
}

/* ══════════════════════════════════════════════════════════════════════════
   DISCLAIMER BOX
   ══════════════════════════════════════════════════════════════════════════ */

.disclaimer {
  border: 1px solid var(--amber, #FFAA00);
  border-radius: 4px;
  padding: 20px 24px;
  margin: 24px 0;
  background: rgba(255, 170, 0, 0.03);
}

.disclaimer-title {
  font-family: var(--mono, 'Space Mono', monospace);
  font-size: 11px;
  font-weight: 700;
  color: var(--amber, #FFAA00);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 10px;
}

.disclaimer p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--dim, #999);
  margin: 0;
}

/* Footer */
.about-footer {
  border-top: 1px solid var(--bg3, #1a1a1a);
  margin-top: 48px;
  padding-top: 20px;
  font-family: var(--mono, 'Space Mono', monospace);
  font-size: 10px;
  color: #444;
}