* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
body { margin: 0; color: var(--text); background: var(--paper); font: 16px/1.6 ui-sans-serif, system-ui, sans-serif; }
a { color: var(--accent); text-underline-offset: 3px; }
button, select, input { font: inherit; }
button, select { min-height: 44px; border: 1px solid var(--line); border-radius: 6px; color: var(--text); background: var(--surface); padding: 8px 13px; }
button { cursor: pointer; }
button:hover { background: var(--hover); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.pricing-panel { border: 1px solid var(--line); border-radius: 6px; padding: 16px; margin: 18px 0; background: var(--soft); }
.pricing-controls { display: flex; flex-wrap: wrap; gap: 14px 24px; }
.pricing-controls label { flex: 1 1 220px; min-width: 0; max-width: 500px; font-size: 14px; font-weight: 600; }
.pricing-controls select, .pricing-controls input { display: block; width: 100%; min-width: 0; margin-top: 6px; }
.pricing-controls input { min-height: 44px; padding: 8px 13px; border: 1px solid var(--line); border-radius: 6px; color: var(--text); background: var(--surface); }
.pricing-panel .scope-note { margin-bottom: 0; overflow-wrap: anywhere; }
.dl-cost-summary { margin-top: 16px; font-size: 14px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); }
.dl-cost-row { display: grid; grid-template-columns: 1fr 1.2fr 1fr; gap: 10px; padding: 12px; }
.dl-cost-row + .dl-cost-row { border-top: 1px solid var(--line); }
.dl-cost-row > * { min-width: 0; overflow-wrap: anywhere; }
input[type=checkbox] { accent-color: var(--accent); width: 17px; height: 17px; }
.skip-link { position: fixed; top: -70px; left: 16px; z-index: 10; background: var(--surface); padding: 10px 20px; }
.skip-link:focus { top: 8px; }
main { max-width: 1240px; margin: auto; padding: 28px 40px 30px; }
.eyebrow { font-size: 11px; line-height: 1.5; letter-spacing: .16em; font-weight: 750; color: var(--accent); margin: 0 0 15px; }
.hero { display: block; padding: 12px 0 24px; }
h1, h2 { font-family: ui-sans-serif, system-ui, sans-serif; font-weight: 650; letter-spacing: -.025em; line-height: 1.25; }
h1 { font-size: clamp(32px, 4vw, 46px); margin: 0 0 14px; }
h1 em { color: var(--accent); }
h2 { font-size: clamp(25px, 2.8vw, 34px); margin: 0; }
.dek { font-size: 17px; max-width: 900px; line-height: 1.6; margin-bottom: 10px; }
.hero-note { font-size: 15px; color: var(--muted); max-width: 1000px; }
.hero-aside { display: flex; flex-wrap: wrap; gap: 10px; padding: 5px 0 0; }
.hero-aside > a { display: flex; align-items: center; font-size: 14px; text-decoration: none; border: 1px solid var(--line); border-radius: 5px; padding: 8px 14px; min-height: 44px; color: var(--accent); }
.hero-aside > a span:first-child { flex: 1; color: var(--text); }
.image-strip { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; margin-top: 23px; max-width: 450px; }
.image-strip img { width: 100%; aspect-ratio: 1; object-fit: cover; display: block; border-radius: 3px; filter: saturate(.55); }
#load-status { font-size: 13px; color: var(--muted); border-top: 1px solid var(--line); padding: 14px 0; margin: 0; }
#load-status.error { color: var(--red); background: var(--warning-bg); padding: 20px; }
.toolbar { display: flex; align-items: center; flex-wrap: wrap; gap: 24px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.model-control { display: grid; gap: 6px; font-size: 14px; font-weight: 650; }
.model-control select { min-width: 260px; font-size: 14px; font-weight: 400; }
.effort-control { display: flex; gap: 18px; border: 0; padding: 0; margin: 0; }
.effort-control legend { font-size: 14px; font-weight: 650; padding: 0 0 9px; }
.effort-control label { display: flex; align-items: center; gap: 6px; min-height: 44px; font-size: 15px; cursor: pointer; }
.effort-symbol { font-size: 16px; }
.refresh-controls { margin-left: auto; display: grid; gap: 4px; }
.refresh-controls button { font-size: 13px; }
.refresh-controls label { display: flex; gap: 7px; align-items: center; font-size: 11px; color: var(--muted); min-height: 28px; }
.model-legend { display: none; }
.model-legend button { border-color: transparent; background: transparent; min-height: 44px; padding: 5px 11px; font-size: 12px; display: flex; align-items: center; gap: 8px; }
.model-legend button[aria-pressed=true] { background: var(--hover); border-color: var(--line); }
.legend-dot { height: 9px; width: 9px; border-radius: 50%; display: inline-block; background: var(--color); flex-shrink: 0; }
.scope-note { font-size: 14px; color: var(--muted); margin-top: 10px; }
.comparison-limit { font-size: 14px; color: var(--warning-ink); margin: 10px 0; }
.headlines { display: grid; grid-template-columns: repeat(3, 1fr); margin: 26px 0 30px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.headline { padding: 23px 24px 23px 0; }
.headline + .headline { border-left: 1px solid var(--line); padding-left: 24px; }
.headline span { display: block; font-size: 12px; font-weight: 750; letter-spacing: .04em; text-transform: uppercase; color: var(--muted); }
.headline strong { display: block; font: 400 32px/1.2 Georgia, serif; margin: 8px 0; color: var(--accent); }
.headline small { font-size: 14px; color: var(--muted); }
.notice { border: 1px solid var(--line); background: var(--warning-bg); color: var(--warning-ink); padding: 10px 16px; margin-bottom: 22px; font-size: 13px; }
.notice summary { cursor: pointer; min-height: 35px; align-content: center; font-weight: 650; }
.chapter { padding: 30px 0 34px; border-bottom: 1px solid var(--line); }
.section-heading { display: flex; align-items: center; gap: 18px; }
.section-heading .eyebrow { margin-bottom: 8px; }
.section-number { font: 400 29px/1 Georgia, serif; color: var(--muted); padding-right: 18px; border-right: 1px solid var(--line); align-self: stretch; padding-top: 12px; }
.direction-pill { margin-left: auto; font-size: 13px; background: var(--soft); color: var(--accent); padding: 7px 12px; border-radius: 30px; white-space: nowrap; }
.section-intro { max-width: 950px; font-size: 16px; color: var(--text); margin: 16px 0 20px; }
.chart-tools { display: flex; align-items: center; justify-content: space-between; gap: 18px; font-size: 14px; color: var(--muted); margin-bottom: 12px; }
.chart-tools label { display: flex; align-items: center; gap: 10px; }
.chart-tools select { font-size: 14px; }
figure { margin: 0; }
.plot { width: 100%; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.plot svg { display: block; width: 100%; font-family: ui-sans-serif, system-ui, sans-serif; }
.plot .grid { stroke: var(--line); stroke-width: 1; }
.plot .axis-text { fill: var(--muted); font-size: 13px; }
.plot .axis-title { fill: var(--text); font-size: 14px; font-weight: 600; }
.plot .guide { fill: var(--accent); font-size: 12px; }
.plot .series-line { fill: none; stroke-width: 1.8; opacity: .75; }
.plot .mark { stroke: var(--surface); stroke-width: 1.5; cursor: pointer; }
.plot .mark:focus { outline: none; stroke: var(--text); stroke-width: 3; }
.plot .mark:hover { stroke: var(--text); stroke-width: 2.5; }
.plot .point-label { font-size: 12px; font-weight: 650; fill: var(--text); pointer-events: none; }
.chart-model-legend { display: flex; flex-wrap: wrap; gap: 4px 8px; padding: 10px 15px; border-top: 1px solid var(--line); }
.chart-model-legend button { display: flex; align-items: center; gap: 8px; min-height: 44px; background: transparent; border-color: transparent; padding: 5px 8px; font-size: 14px; }
.chart-model-legend button:hover { background: var(--hover); }
.point-detail { min-height: 64px; background: var(--surface-muted); font-size: 15px; padding: 12px 16px; border-radius: 5px; margin: 12px 0; }
.point-detail a { white-space: nowrap; }
figcaption { color: var(--muted); font-size: 14px; line-height: 1.65; max-width: 1000px; }
.empty-plot { padding: 48px 24px; color: var(--muted); font-size: 14px; text-align: center; }
.reading { display: grid; grid-template-columns: 135px 1fr; gap: 20px; border-left: 3px solid var(--accent); padding: 14px 18px; margin-top: 24px; background: var(--soft); }
.reading-label { font-size: 10px; letter-spacing: .09em; font-weight: 750; padding-top: 3px; color: var(--accent); }
.reading p { margin: 0; font-size: 15px; }
.cutoff-panel { display: grid; grid-template-columns: 1fr 1.15fr; gap: 40px; padding: 23px 26px; margin-top: 24px; border: 1px solid var(--line); border-radius: 8px; }
.cutoff-panel label { font-size: 13px; }
.cutoff-panel output { color: var(--accent); font-weight: 750; }
.cutoff-panel input { width: 100%; accent-color: var(--accent); margin-top: 17px; min-height: 28px; }
.cutoff-panel p { font-size: 13px; margin: 0; }
.questions { display: grid; grid-template-columns: 1fr 1fr; gap: 0 30px; }
.question { border-top: 1px solid var(--line); padding: 12px 0; }
.question summary { font-size: 16px; font-weight: 600; cursor: pointer; min-height: 44px; padding-top: 9px; }
.question p { font-size: 15px; color: var(--text); margin: 10px 0 14px; }
.advanced { padding: 14px 0; }
.advanced > summary { font-size: 16px; font-weight: 650; min-height: 44px; padding: 10px 0; cursor: pointer; color: var(--accent); }
.advanced[open] > summary { margin-bottom: 20px; }
.quality-row { display: grid; grid-template-columns: minmax(180px, 280px) 1fr 75px; align-items: center; gap: 16px; padding: 10px 0; font-size: 14px; }
.quality-track { height: 14px; background: var(--track); }
.quality-track span { display: block; height: 100%; }
.quality-row strong { text-align: right; }
.table-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: 6px; }
table { width: 100%; border-collapse: collapse; font-size: 12px; white-space: nowrap; background: var(--surface); }
th, td { text-align: right; padding: 13px 15px; border-bottom: 1px solid var(--line); font-variant-numeric: tabular-nums; }
th { font-size: 10px; text-transform: uppercase; letter-spacing: .04em; background: var(--surface-muted); color: var(--muted); }
th:first-child, td:first-child { text-align: left; }
td small { display: block; color: var(--muted); font-size: 10px; }
td:first-child { border-left: 3px solid var(--color); }
tr.partial { background: var(--warning-bg); }
.methods { margin: 30px 0; font-size: 14px; color: var(--muted); }
.methods summary { color: var(--text); font-size: 14px; font-weight: 650; min-height: 44px; cursor: pointer; }
.methods li { overflow-wrap: anywhere; }
footer { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; color: var(--muted); font-size: 11px; padding-top: 24px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
@media (max-width: 800px) {
  main { padding: 30px 24px; }
  .refresh-controls { margin-left: 0; }
  .direction-pill { display: none; }
}
@media (max-width: 600px) {
  .quality-row { grid-template-columns: 1fr 75px; gap: 5px 12px; }
  .quality-row > span { grid-column: 1 / -1; }
  main { padding: 24px 16px; }
  .hero { display: block; padding-top: 10px; }
  .dek { font-size: 17px; }
  .image-strip { max-width: 380px; }
  .toolbar { gap: 16px; }
  .model-control { width: 100%; }
  .model-control select { min-width: 0; width: 100%; }
  .refresh-controls { display: flex; align-items: center; flex-wrap: wrap; gap: 16px; }
  .headlines { grid-template-columns: 1fr; margin-top: 20px; }
  .headline, .headline + .headline { border-left: 0; padding: 15px 0; }
  .headline + .headline { border-top: 1px solid var(--line); }
  .headline strong { font-size: 27px; margin: 5px 0; }
  .chapter { padding: 32px 0; }
  .section-number { display: none; }
  .chart-tools { display: grid; gap: 9px; }
  .chart-tools label { display: grid; gap: 5px; }
  .reading { display: block; padding: 13px 16px; }
  .reading-label { display: block; margin-bottom: 7px; }
  .questions { display: block; }
  .cutoff-panel { grid-template-columns: 1fr; gap: 20px; padding: 18px; }
  .point-detail { min-height: 84px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }