/* Field report page. Inherits the site's tokens from site.css; adds only the
   chart layer. Series colors were validated for colorblind separation against
   a white surface (aqua/orange/blue, worst all-pairs CVD ΔE 9.2). */
.bm-page {
  --series-1: #1baf7a;
  --series-2: #eb6834;
  --ramp-1: #86b6ef;
  --ramp-3: #256abf;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
}
.bm-page .wrap {
  max-width: 1180px;
}
.bm-rule {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 0;
}
.bm-section {
  padding: 82px 0;
}
.bm-gap {
  margin-top: 74px;
  scroll-margin-top: 100px;
}

/* hero */
.bm-hero {
  padding: 74px 0 30px;
}
.bm-eyebrow {
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 22px;
}
.bm-page h1 {
  font-size: clamp(38px, 5vw, 68px);
  line-height: 1.08;
  font-weight: 500;
  letter-spacing: -0.055em;
  text-wrap: balance;
}
.bm-page h2 {
  font-size: clamp(30px, 3.6vw, 48px);
}
.bm-lede {
  margin-top: 26px;
  max-width: 62ch;
  font-size: 19px;
  color: var(--muted);
}
.bm-figure {
  margin-top: 56px;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 38px;
}
.bm-number {
  font-size: 112px;
  line-height: 0.92;
  font-weight: 500;
  letter-spacing: -0.06em;
}
.bm-number small {
  font-size: 40px;
  letter-spacing: -0.04em;
}
.bm-figure-caption {
  max-width: 44ch;
  font-size: 15px;
  color: var(--muted);
  padding-bottom: 12px;
}

/* stat tiles */
.bm-tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(212px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: 52px;
}
.bm-tile {
  background: var(--canvas);
  padding: 24px 22px 22px;
}
.bm-tile .label {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 12px;
  /* Reserve two lines so the four big values share one baseline even when the
     English label wraps and the Chinese one does not. */
  min-height: 2.7em;
  line-height: 1.35;
}
.bm-tile .value {
  font-size: 38px;
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 1;
}
.bm-tile .note {
  font-size: 13px;
  color: var(--muted);
  margin-top: 10px;
  line-height: 1.5;
}

/* chart shell */
.bm-head {
  max-width: 64ch;
  margin-bottom: 44px;
}
.bm-head p {
  margin-top: 18px;
  color: var(--muted);
  font-size: 17px;
}
.bm-chart {
  margin: 0;
}
.bm-chart-title {
  font-size: 17px;
  font-weight: 550;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}
.bm-chart-sub {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 26px;
}
.bm-chart figcaption {
  font-size: 13px;
  color: var(--muted);
  margin-top: 18px;
  max-width: 78ch;
  line-height: 1.6;
}
.bm-legend {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 22px;
}
.bm-legend i {
  width: 11px;
  height: 11px;
  border-radius: 3px;
  display: inline-block;
  margin-right: 7px;
  vertical-align: -1px;
  background: var(--series-1);
}
.bm-legend i.human {
  background: var(--series-2);
}

/* horizontal bars */
.bm-bars {
  display: grid;
  gap: 16px;
}
.bm-bar {
  display: grid;
  grid-template-columns: 186px 1fr 64px;
  gap: 18px;
  align-items: center;
}
.bm-bar .k {
  font-size: 14px;
  color: var(--muted);
  text-align: right;
  line-height: 1.35;
}
.bm-bar .track {
  height: 22px;
  background: linear-gradient(to right, var(--grid) 0 1px, transparent 1px) repeat-x;
  background-size: 25% 100%;
}
.bm-bar .fill {
  height: 22px;
  border-radius: 0 4px 4px 0;
  background: var(--series-1);
  outline: none;
}
.bm-bar .fill:focus-visible {
  box-shadow: 0 0 0 3px var(--action);
}
.bm-bar .v {
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.bm-haxis {
  display: grid;
  grid-template-columns: 186px 1fr 64px;
  gap: 18px;
  margin-top: 10px;
}
.bm-haxis .ticks {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--muted);
  border-top: 1px solid var(--axis);
  padding-top: 6px;
  font-variant-numeric: tabular-nums;
}

/* daily curve */
.bm-svg {
  width: 100%;
  height: auto;
  display: block;
  overflow: visible;
}
.bm-grid {
  stroke: var(--grid);
  stroke-width: 1;
}
.bm-axis {
  stroke: var(--axis);
  stroke-width: 1;
}
.bm-area {
  fill: var(--series-1);
  opacity: 0.1;
}
.bm-line {
  fill: none;
  stroke: var(--series-1);
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
}
.bm-dot {
  fill: var(--series-1);
  stroke: var(--canvas);
  stroke-width: 2;
}
.bm-peak {
  font-size: 13px;
  fill: var(--ink);
  font-variant-numeric: tabular-nums;
}
.bm-tick {
  font-size: 12px;
  fill: var(--muted);
  text-anchor: middle;
}
.bm-tick-y {
  text-anchor: end;
}
.bm-hit rect {
  fill: transparent;
}
.bm-hit circle {
  fill: var(--series-1);
  stroke: var(--canvas);
  stroke-width: 2;
  opacity: 0;
}
.bm-hit:hover circle,
.bm-hit:focus-within circle {
  opacity: 1;
}

/* unit chart */
.bm-units {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  max-width: 760px;
}
.bm-units i {
  width: 13px;
  height: 13px;
  border-radius: 3px;
  display: block;
  background: var(--series-1);
}
.bm-units i.human {
  background: var(--series-2);
}
.bm-units-note {
  display: flex;
  gap: 26px;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--muted);
  margin-top: 22px;
}
.bm-units-note b {
  color: var(--ink);
  font-weight: 550;
  font-variant-numeric: tabular-nums;
}

/* table twins */
.bm-data {
  margin-top: 26px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}
.bm-data summary {
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
  list-style: none;
  /* site.css spreads the landing page's summaries with space-between; here the
     marker belongs next to the label, not pinned to the far edge. */
  display: inline-block;
  justify-content: initial;
}
.bm-data summary::-webkit-details-marker {
  display: none;
}
.bm-data summary::after {
  content: " +";
}
.bm-data[open] summary::after {
  content: " −";
}
.bm-data table {
  border-collapse: collapse;
  margin-top: 16px;
  font-size: 14px;
  width: 100%;
  max-width: 620px;
}
.bm-data th,
.bm-data td {
  text-align: left;
  padding: 9px 14px 9px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.bm-data th {
  font-weight: 550;
  color: var(--muted);
  font-size: 13px;
}
.bm-data td.num {
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.bm-data > table {
  display: block;
  max-height: 420px;
  overflow-y: auto;
}

/* capability grid */
.bm-caps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.bm-cap {
  background: var(--canvas);
  padding: 26px 24px;
}
.bm-cap h3 {
  margin-bottom: 12px;
}
.bm-cap .m {
  font-size: 34px;
  font-weight: 500;
  letter-spacing: -0.04em;
  margin-bottom: 10px;
}
.bm-cap p {
  font-size: 14px;
  color: var(--muted);
}
.bm-cap .base {
  font-size: 13px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}
.bm-cap .base b {
  color: var(--ink);
  font-weight: 550;
}

/* method + caveats */
.bm-method {
  background: #f7faf9;
  border: 1px solid var(--line);
  padding: 36px 34px;
}
.bm-method h3 {
  margin-bottom: 20px;
}
.bm-method ol {
  margin: 0;
  padding-left: 22px;
  font-size: 15px;
  color: var(--muted);
  line-height: 1.75;
}
.bm-method ol li + li {
  margin-top: 12px;
}
.bm-method code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  background: #fff;
  border: 1px solid var(--line);
  padding: 1px 5px;
  border-radius: 4px;
  color: var(--ink);
}
.bm-caveat {
  margin-top: 28px;
  font-size: 14px;
  color: var(--muted);
  border-left: 2px solid var(--series-2);
  padding-left: 16px;
  line-height: 1.7;
}
.bm-caveat p + p {
  margin-top: 10px;
}
.bm-footnote {
  margin-top: 24px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.65;
}

/* faq + footer */
.bm-faq details {
  border-top: 1px solid var(--line);
  padding: 18px 0;
}
.bm-faq details:last-child {
  border-bottom: 1px solid var(--line);
}
.bm-faq summary {
  font-size: 17px;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 20px;
}
.bm-faq summary::-webkit-details-marker {
  display: none;
}
.bm-faq details[open] summary span {
  visibility: hidden;
}
.bm-faq p {
  margin-top: 14px;
  color: var(--muted);
  font-size: 15px;
  max-width: 78ch;
}
.bm-footer {
  padding: 48px 0 74px;
  font-size: 13px;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 32px;
  justify-content: space-between;
}
.bm-footer a {
  text-decoration: underline;
  text-underline-offset: 4px;
}

@media (max-width: 760px) {
  .bm-section,
  .bm-hero {
    padding: 54px 0;
  }
  .bm-gap {
    margin-top: 54px;
  }
  .bm-bar,
  .bm-haxis {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .bm-bar .k {
    text-align: left;
  }
  .bm-number {
    font-size: 74px;
  }
  .bm-svg {
    min-height: 220px;
  }
}