:root {
  /* epoch.ai design tokens */
  --charcoal-50: #f5f5f5;
  --charcoal-100: #eeeeee;
  --charcoal-200: #e3e4e4;
  --charcoal-300: #c7caca;
  --charcoal-500: #8b9999;
  --charcoal-700: #536565;
  --charcoal-900: #212a2a;
  --charcoal-1000: #090c0c;
  --blue-600: #009af1;
  --blue-800: #1d5474;
  /* rating scale 0→5 */
  --r0: #eeeeee; --r1: #beefff; --r2: #8bdfff;
  --r3: #1db0ff; --r4: #009af1; --r5: #1d5474;
  --sans: "Messina Sans", "Helvetica Neue", "Inter", Arial, sans-serif;
  --mono: "PT Mono", "SF Mono", "IBM Plex Mono", Menlo, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scrollbar-gutter: stable both-edges; }

body {
  font-family: var(--sans);
  color: var(--charcoal-900);
  background: #ffffff;
  font-size: 15px;
  line-height: 1.45;
  max-width: 980px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

header { border-bottom: 1px solid var(--charcoal-900); padding-bottom: 16px; }
.masthead { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; }
h1 { font-size: 26px; font-weight: 600; letter-spacing: -0.01em; }
.subtitle { color: var(--charcoal-700); margin-top: 4px; font-size: 14px; }
.subtitle a { color: var(--blue-800); }

.views { display: flex; gap: 2px; }
.view-btn {
  font: 13px var(--mono);
  padding: 5px 12px;
  background: none;
  border: 1px solid var(--charcoal-200);
  border-radius: 2px;
  color: var(--charcoal-700);
  cursor: pointer;
}
.view-btn.active { background: var(--charcoal-900); border-color: var(--charcoal-900); color: #fff; }

.rubric { margin-top: 14px; font-size: 13px; }
.rubric summary { cursor: pointer; color: var(--charcoal-700); font-family: var(--mono); font-size: 12px; }
.rubric-row { display: flex; gap: 10px; margin-top: 8px; align-items: baseline; }
.rubric-row .desc { color: var(--charcoal-700); }
.rubric-example { margin-top: 12px; padding-top: 10px; border-top: 1px solid var(--charcoal-200); }
.rubric-example p { margin-top: 6px; color: var(--charcoal-700); }
.rubric-example .lvl { font-family: var(--mono); color: var(--charcoal-900); }
.method-body { max-width: 720px; }
.method-body p { margin-top: 8px; color: var(--charcoal-700); }
.method-body b { color: var(--charcoal-900); font-weight: 600; }
.method-body a { color: var(--blue-800); }

/* rating chip: numeral always visible — identity never color-alone */
.chip {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 30px; height: 20px; padding: 0 5px;
  border-radius: 2px;
  font: 12px var(--mono);
}
.chip.r0 { background: var(--r0); color: var(--charcoal-900); }
.chip.r1 { background: var(--r1); color: var(--charcoal-900); }
.chip.r2 { background: var(--r2); color: var(--charcoal-900); }
.chip.r3 { background: var(--r3); color: #fff; }
.chip.r4 { background: var(--r4); color: #fff; }
.chip.r5 { background: var(--r5); color: #fff; }
.chip.mean { background: none; border: 1px solid var(--charcoal-200); color: var(--charcoal-900); }

/* current view */
section.category { margin-top: 36px; }
.cat-head { display: flex; align-items: baseline; gap: 10px; border-bottom: 1px solid var(--charcoal-900); padding-bottom: 6px; }
.cat-head .num { font: 14px var(--mono); color: var(--charcoal-500); }
.cat-head h2 { font-size: 19px; font-weight: 600; }
.cat-head .blurb { color: var(--charcoal-700); font-size: 13px; flex: 1; }
.cat-note { font-size: 12.5px; color: var(--charcoal-500); margin-top: 6px; }

.subcat { margin-top: 18px; }
.subcat-head { display: flex; align-items: baseline; gap: 8px; padding-bottom: 4px; }
.subcat-head .num { font: 12px var(--mono); color: var(--charcoal-500); }
.subcat-head h3 { font-size: 14.5px; font-weight: 600; display: inline; }
.subcat-head .desc { color: var(--charcoal-700); font-size: 13px; }

table { width: 100%; border-collapse: collapse; }
tr.task { border-top: 1px solid var(--charcoal-200); cursor: pointer; }
tr.task:hover { background: var(--charcoal-50); }
tr.task td { padding: 7px 8px 7px 0; vertical-align: baseline; }
td.tid { font: 12px var(--mono); color: var(--charcoal-500); width: 52px; padding-left: 2px; }
td.tname { padding-right: 16px; }
td.trating { width: 40px; text-align: right; }
tr.detail td { padding: 2px 8px 14px 54px; }
.detail-box { font-size: 13.5px; color: var(--charcoal-700); border-left: 2px solid var(--charcoal-200); padding-left: 12px; }
.detail-box .io { margin-top: 6px; font-size: 12.5px; }
.detail-box .io b { color: var(--charcoal-900); font-weight: 600; }
.history { margin-top: 8px; }
.history-row { display: flex; gap: 10px; align-items: center; margin-top: 4px; }
.history-row .date, .history-row .src { font: 12px var(--mono); color: var(--charcoal-500); }
.history-row .rationale { font-size: 12.5px; }
.evidence a { color: var(--blue-800); }

/* timeline view */
.chart-block { margin-top: 32px; }
.chart-block h2 { font-size: 16px; font-weight: 600; }
.chart-note { font: 12px var(--mono); color: var(--charcoal-500); margin-top: 4px; }
.legend { display: flex; flex-wrap: wrap; gap: 14px; margin: 12px 0 4px; font-size: 13px; }
.legend .key { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 5px; vertical-align: baseline; }
svg text { font-family: var(--mono); font-size: 11px; fill: var(--charcoal-500); }
svg .axis line, svg .axis path { stroke: var(--charcoal-200); }
svg .gridline { stroke: var(--charcoal-100); }
.small-multiples { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 20px 24px; margin-top: 16px; }
.uplift-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 24px 28px; margin-top: 16px; }
.legend .key-anchor { width: 8px; height: 8px; background: #212a2a; transform: rotate(45deg); border-radius: 1px; }
.sm-cell .sm-title { font-size: 12.5px; color: var(--charcoal-700); margin-bottom: 2px; }
.sm-cell .sm-title .num { font-family: var(--mono); color: var(--charcoal-500); }

.comparisons { margin-top: 28px; max-width: 720px; border-top: 1px solid var(--charcoal-200); padding-top: 10px; }
.comparisons h3 { font-size: 14px; font-weight: 600; }
.comparisons p { margin-top: 8px; font-size: 13px; color: var(--charcoal-700); }
.comparisons a { color: var(--blue-800); font-family: var(--mono); font-size: 12px; }

/* sources view */
.src-table { margin-top: 8px; }
.src-table tr { border-top: 1px solid var(--charcoal-100); }
.src-table td { padding: 5px 10px 5px 0; vertical-align: baseline; font-size: 13px; }
.src-link a { color: var(--blue-800); }
.src-note { color: var(--charcoal-700); margin-left: 6px; }
.src-meta { font: 12px var(--mono); color: var(--charcoal-500); white-space: nowrap; width: 130px; }
.src-meta a { color: var(--charcoal-700); }
.src-cites { font: 12px var(--mono); color: var(--charcoal-700); text-align: right; width: 40px; cursor: default; }
.src-claim { color: var(--charcoal-900); }
.retro { border: 1px solid var(--charcoal-300); border-radius: 2px; padding: 0 3px; font-size: 10px; color: var(--charcoal-500); }
.src-topic { margin-top: 20px; }
.src-topic h3 { font-size: 14px; font-weight: 600; font-family: var(--mono); }

#tooltip {
  position: fixed;
  background: var(--charcoal-1000);
  color: #fff;
  font: 12px var(--mono);
  padding: 5px 8px;
  border-radius: 2px;
  pointer-events: none;
  z-index: 10;
  max-width: 260px;
}

footer { margin-top: 48px; border-top: 1px solid var(--charcoal-200); padding-top: 10px; font: 12px var(--mono); color: var(--charcoal-500); }
footer a { color: var(--charcoal-700); }
footer .credit { margin-top: 6px; }

@media (max-width: 600px) {
  body { padding: 24px 14px 60px; }
  .masthead { flex-direction: column; gap: 8px; }
  td.tname { font-size: 14px; }
}