:root {
  --paper: #eef4f7;
  --paper-deep: #dce6eb;
  --ink: #111923;
  --ink-soft: #52616d;
  --line: #aab9c2;
  --cobalt: #2147ff;
  --magenta: #e52d72;
  --mint: #30d6a3;
  --white: #ffffff;
  --max: 1180px;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --display: "Arial Narrow", "Roboto Condensed", Haettenschweiler, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.5;
  background-image:
    linear-gradient(rgba(44, 69, 84, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(44, 69, 84, 0.055) 1px, transparent 1px);
  background-size: 24px 24px;
}

a { color: inherit; }
button, input, select { font: inherit; }
button, input, select, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--magenta); outline-offset: 3px; }
::selection { background: var(--cobalt); color: var(--white); }

.skip-link {
  position: fixed;
  z-index: 100;
  left: 1rem;
  top: -5rem;
  padding: .75rem 1rem;
  background: var(--ink);
  color: var(--white);
}
.skip-link:focus { top: 1rem; }

.site-header {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--ink);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(10px);
}
.wordmark { display: inline-flex; align-items: center; gap: .7rem; text-decoration: none; font-weight: 750; }
.wordmark__mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--ink);
  background: var(--mint);
  font: 700 .72rem var(--mono);
  box-shadow: 4px 4px 0 var(--ink);
}
.site-header nav { display: flex; gap: 1.2rem; font: 600 .78rem var(--mono); text-transform: uppercase; letter-spacing: .06em; }
.site-header nav a { text-underline-offset: 4px; }

.hero {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
  padding: clamp(4rem, 11vw, 9rem) 0 clamp(3rem, 7vw, 6rem);
  display: grid;
  grid-template-columns: 1fr minmax(0, 4fr);
  gap: 1rem 3rem;
}
.hero__index, .eyebrow {
  margin: .35rem 0 0;
  color: var(--cobalt);
  font: 700 .72rem var(--mono);
  text-transform: uppercase;
  letter-spacing: .12em;
}
.hero__copy h1 {
  max-width: 10ch;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(4.2rem, 10vw, 9.3rem);
  font-stretch: condensed;
  font-weight: 900;
  line-height: .78;
  letter-spacing: -.065em;
  text-transform: uppercase;
}
.hero__copy p {
  max-width: 760px;
  margin: 2.25rem 0 0;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 2vw, 1.45rem);
  line-height: 1.45;
}
.hero__proof {
  grid-column: 2;
  margin: 2.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  list-style: none;
}
.hero__proof li {
  padding: .85rem .5rem;
  font: 650 .71rem var(--mono);
  text-transform: uppercase;
  letter-spacing: .04em;
}
.hero__proof li + li { border-left: 1px solid var(--line); }

.chamber {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 56px 1fr;
  border: 1px solid var(--ink);
  background: rgba(255, 255, 255, .64);
  box-shadow: 12px 12px 0 var(--ink);
}
.chamber__rail {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  align-items: center;
  border-right: 1px solid var(--ink);
  background: var(--cobalt);
  color: var(--white);
  overflow: hidden;
}
.chamber__rail span {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font: 700 .66rem var(--mono);
  letter-spacing: .16em;
}
.chamber__body { padding: clamp(1.25rem, 4vw, 3.5rem); min-width: 0; }
.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, .55fr);
  gap: 2rem;
  align-items: end;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--ink);
}
.section-heading h2 {
  max-width: 760px;
  margin: .55rem 0 0;
  font-size: clamp(2rem, 5vw, 4.5rem);
  line-height: .98;
  letter-spacing: -.055em;
}
.section-heading__note { margin: 0; color: var(--ink-soft); font-size: .9rem; }

.evaluation-form { padding-top: 2rem; }
fieldset { min-width: 0; margin: 0; padding: 0; border: 0; }
legend { width: 100%; margin-bottom: 1rem; font: 750 .76rem var(--mono); text-transform: uppercase; letter-spacing: .08em; }
.sample-controls {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--ink);
  border: 1px solid var(--ink);
}
.sample-controls legend { grid-column: 1 / -1; margin: 0; padding: .7rem .9rem; background: var(--ink); color: var(--white); }
label { display: grid; gap: .45rem; }
label > span { color: var(--ink-soft); font: 650 .74rem var(--mono); }
.sample-controls label { padding: 1rem; background: var(--paper); }
input, select {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--white);
  color: var(--ink);
  padding: .7rem .8rem;
}
input:focus, select:focus { border-color: var(--cobalt); }
.sample-controls input { border: 0; border-bottom: 3px solid var(--cobalt); font: 700 1.6rem var(--mono); background: transparent; padding-inline: 0; }

.paired-controls { margin-top: 2.3rem; }
.field-help { max-width: 760px; margin: -.25rem 0 1.3rem; color: var(--ink-soft); font-size: .9rem; }
.outcome-field { grid-template-columns: 145px 1fr; align-items: center; gap: 1rem; padding: .75rem 0; border-top: 1px solid var(--line); }
.outcome-field--b { border-bottom: 1px solid var(--line); }
.outcome-field b { color: var(--ink); }
.outcome-field input { font: 650 .94rem var(--mono); letter-spacing: .08em; }
.outcome-field--a input { border-left: 6px solid var(--cobalt); }
.outcome-field--b input { border-left: 6px solid var(--magenta); }
.paired-controls__meta { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 1.2rem; }

.run-button {
  width: 100%;
  min-height: 62px;
  margin-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--ink);
  border-radius: 0;
  padding: 1rem 1.25rem;
  background: var(--mint);
  color: var(--ink);
  font-weight: 800;
  cursor: pointer;
  box-shadow: 6px 6px 0 var(--ink);
  transition: transform .15s ease, box-shadow .15s ease;
}
.run-button:hover { transform: translate(2px, 2px); box-shadow: 4px 4px 0 var(--ink); }
.run-button:disabled { cursor: wait; opacity: .6; }

.result { margin-top: 3.5rem; padding-top: 1.2rem; border-top: 4px solid var(--ink); }
.result__header { display: flex; justify-content: space-between; gap: 1rem; align-items: baseline; }
.result__header p { margin: 0; }
#result-status { color: var(--ink-soft); font: .76rem var(--mono); text-align: right; }
.result__grid { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 1rem; border: 1px solid var(--ink); }
.result__grid article { min-width: 0; padding: 1rem; background: var(--white); }
.result__grid article + article { border-left: 1px solid var(--ink); }
.result__grid p { margin: 0; font: 700 .69rem var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-soft); }
.result__grid strong { display: block; margin: .8rem 0 .5rem; font: 800 clamp(1.25rem, 3vw, 2.4rem) var(--mono); letter-spacing: -.06em; overflow-wrap: anywhere; }
.result__grid span { display: block; color: var(--ink-soft); font-size: .74rem; }
.interval-plot { position: relative; height: 34px; margin-top: 1.3rem; background: var(--paper-deep); border: 1px solid var(--ink); }
.interval-plot__zero { position: absolute; left: 50%; inset-block: 0; width: 1px; background: var(--ink); }
.interval-plot__range { position: absolute; top: 11px; left: 50%; width: .5%; height: 10px; background: var(--cobalt); }
.interval-plot__point { position: absolute; top: 5px; left: 50%; width: 22px; height: 22px; border: 3px solid var(--ink); background: var(--mint); transform: translateX(-50%) rotate(45deg); }
.interval-scale { display: flex; justify-content: space-between; margin-top: .4rem; color: var(--ink-soft); font: .68rem var(--mono); }

.method { width: min(calc(100% - 2rem), var(--max)); margin: clamp(6rem, 12vw, 10rem) auto; }
.method__grid { display: grid; grid-template-columns: repeat(2, 1fr); border: 1px solid var(--ink); border-top: 0; }
.method__grid article { position: relative; min-height: 245px; padding: 2rem; background: rgba(238, 244, 247, .86); }
.method__grid article:nth-child(even) { border-left: 1px solid var(--ink); }
.method__grid article:nth-child(n+3) { border-top: 1px solid var(--ink); }
.method__grid span { font: 700 .72rem var(--mono); color: var(--magenta); }
.method__grid h3 { margin: 3rem 0 .75rem; font-size: 1.45rem; }
.method__grid p { max-width: 52ch; margin: 0; color: var(--ink-soft); }

footer { width: min(calc(100% - 2rem), var(--max)); margin: 0 auto; padding: 2rem 0 4rem; display: flex; justify-content: space-between; gap: 1rem; border-top: 1px solid var(--ink); font: .72rem var(--mono); }
footer p { margin: 0; }

@media (max-width: 820px) {
  .hero { grid-template-columns: 1fr; }
  .hero__proof { grid-column: 1; grid-template-columns: repeat(2, 1fr); }
  .hero__proof li:nth-child(3) { border-left: 0; border-top: 1px solid var(--line); }
  .hero__proof li:nth-child(4) { border-top: 1px solid var(--line); }
  .section-heading { grid-template-columns: 1fr; }
  .result__grid { grid-template-columns: repeat(2, 1fr); }
  .result__grid article:nth-child(3) { border-left: 0; border-top: 1px solid var(--ink); }
  .result__grid article:nth-child(4) { border-top: 1px solid var(--ink); }
}

@media (max-width: 560px) {
  .site-header { min-height: 66px; }
  .wordmark > span:last-child { display: none; }
  .site-header nav { gap: .7rem; }
  .hero__copy h1 {
    font-size: clamp(3rem, 14vw, 3.75rem);
    letter-spacing: -.075em;
  }
  .hero__proof { grid-template-columns: 1fr; }
  .hero__proof li + li { border-left: 0; border-top: 1px solid var(--line); }
  .chamber { grid-template-columns: 28px 1fr; box-shadow: 6px 6px 0 var(--ink); }
  .chamber__rail span { font-size: .58rem; }
  .sample-controls, .paired-controls__meta { grid-template-columns: 1fr; }
  .outcome-field { grid-template-columns: 1fr; }
  .result__grid, .method__grid { grid-template-columns: 1fr; }
  .result__grid article + article, .method__grid article:nth-child(even) { border-left: 0; }
  .result__grid article + article, .method__grid article:nth-child(n+2) { border-top: 1px solid var(--ink); }
  .result__header, footer { flex-direction: column; }
  #result-status { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

@media (forced-colors: active) {
  .wordmark__mark, .run-button, .chamber__rail, .interval-plot__range, .interval-plot__point { forced-color-adjust: none; }
}