@font-face {
  font-family: "PiSerif";
  src: url("https://www.pi.website/_next/static/media/9cf9c6e84ed13b5e-s.p.woff2") format("woff2");
  font-display: swap;
}

@font-face {
  font-family: "PiMono";
  src: url("https://www.pi.website/_next/static/media/dcb532816ecc2c68-s.p.woff2") format("woff2");
  font-display: swap;
}

:root {
  --background: #f7f6f2;
  --foreground: #111111;
  --muted: #a8a179;
  --panel: #eeece4;
  --panel-light: #f5f4ef;
  --line: #e6e0cb;
  --yellow: #fbd45b;
  --yellow-dark: #edc549;
  --green: #4c7e4d;
  --soft-green: #9cbe70;
  --blue-gray: #b7c8c9;
  --mono:
    "PiMono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    monospace;
  --serif: "PiSerif", Georgia, Cambria, "Times New Roman", serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--foreground);
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 8px;
}

a:hover {
  color: rgba(17, 17, 17, 0.68);
  text-decoration-thickness: 2px;
}

.page {
  overflow: hidden;
  padding: 1rem;
}

.topbar,
.title-block,
.prose,
footer {
  width: min(48rem, 100%);
  margin-inline: auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 4rem;
  padding-top: 2rem;
}

.brand,
.footer-brand {
  font-family: var(--serif);
  font-size: 1.875rem;
  line-height: 1;
  text-decoration: none;
}

nav {
  display: flex;
  gap: 1rem;
}

nav a {
  text-decoration-thickness: 1px;
}

h1 {
  margin: 0 0 1.5rem;
  font-family: var(--serif);
  font-size: clamp(3rem, 7vw, 4rem);
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

h3 {
  position: relative;
  margin: 3rem 0 1rem;
  font-size: 1.5rem;
  font-weight: 400;
  line-height: 1.35;
}

h4 {
  margin: 0;
  color: #c0bdad;
  font-size: 10px;
  font-weight: 700;
  line-height: 32px;
  text-transform: uppercase;
}

.prose {
  margin-top: 3rem;
  margin-bottom: 3rem;
}

.prose p {
  margin: 0 0 1.25rem;
}

.prose strong {
  font-weight: 700;
}

.meta-block {
  margin-top: 0;
  margin-bottom: 3rem;
}

.meta-grid {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 0.125rem 0.5rem;
}

.meta-grid > div:nth-child(odd) {
  color: var(--foreground);
}

.meta-grid a {
  text-underline-offset: 2px;
}

.dotted {
  text-decoration: underline;
  text-decoration-style: dotted;
  text-decoration-color: rgba(17, 17, 17, 0.5);
  text-underline-offset: 4px;
}

.hero-video {
  width: min(84rem, 100%);
  margin: 0 auto 3rem;
  overflow: hidden;
  border-radius: 0.75rem;
  background: #000000;
  box-shadow: 0 12px 28px rgba(17, 17, 17, 0.18);
}

.hero-video video {
  display: block;
  width: 100%;
  max-height: 78vh;
  object-fit: contain;
  background: var(--background);
}

.carousel-strip {
  width: min(84rem, 100%);
  margin: 3rem auto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  padding: 0;
}

.carousel-strip figure {
  width: 100%;
  margin: 0;
}

.carousel-strip img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 0.375rem;
  background: var(--panel);
}

.carousel-strip figcaption {
  padding-top: 0.45rem;
  font-size: 12px;
  font-style: italic;
}

.system-graphic,
.chart-panel,
.mode-graphic,
.pipeline-figure {
  width: min(84rem, 100%);
  margin: 3rem auto;
}

.pipeline-figure {
  overflow: hidden;
  border: 0;
  border-radius: 0.375rem;
  background: transparent;
  box-shadow: none;
}

.pipeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 0.375rem;
  box-shadow: 0 10px 24px rgba(17, 17, 17, 0.12);
}

.system-graphic,
.chart-panel {
  padding: clamp(1rem, 4vw, 4rem);
  background-color: var(--background);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 16px 16px;
  box-shadow:
    inset 0 0 48px 48px var(--background),
    0 1px 0 var(--line);
}

.caption-card {
  width: min(463px, 100%);
  margin-bottom: 1rem;
  padding: 15px;
  background: var(--background);
  font-size: 12px;
  line-height: 1.65;
}

.caption-card p {
  margin: 0;
}

.stage {
  position: relative;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 0 0.5rem 1rem;
}

.stage h4 {
  padding-inline: 0.25rem;
}

.stage-grid {
  display: grid;
  gap: 0.5rem;
  padding: 0 0.5rem;
}

.stage-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stage-grid.four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.box {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #c0bdad;
  background: var(--panel-light);
  box-shadow: 3px 3px 0 #c0bdad;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.25;
  text-align: center;
  padding: 0.75rem;
}

.numbered {
  position: relative;
  padding-left: 2.5rem;
}

.numbered span,
.number {
  display: grid;
  place-items: center;
  width: 33px;
  height: 33px;
  background: var(--yellow);
  color: #111111;
  font-size: 12px;
  font-weight: 600;
}

.numbered span {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
}

.arrow-row {
  display: flex;
  justify-content: space-around;
  width: min(47rem, 100%);
  margin: -1px auto 13px;
}

.arrow-row span {
  width: 96px;
  height: 81px;
  clip-path: polygon(16% 0, 84% 0, 84% 30%, 100% 30%, 50% 100%, 0 30%, 16% 30%);
  border: 1px solid var(--line);
  background: var(--panel);
}

.arrow-row.single {
  justify-content: center;
  margin-top: -1px;
}

.arrow-row.single span {
  background: var(--yellow);
  border-color: var(--yellow-dark);
}

.model-stage {
  position: relative;
  margin-bottom: 0.875rem;
  border: 1px solid var(--yellow-dark);
  background: var(--yellow);
  padding: 2rem;
}

.model-box {
  position: relative;
  min-height: 140px;
  border: 1px solid #000000;
  background: var(--panel-light);
  box-shadow: 3px 3px 0 #000000;
  padding: 1rem;
  display: grid;
  place-items: center;
  text-align: center;
}

.model-box .number {
  position: absolute;
  top: 1rem;
  left: 1rem;
}

.model-box strong {
  font-family: var(--serif);
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 400;
  line-height: 1;
}

.model-inner {
  width: min(680px, 100%);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1.25rem;
  border: 1px solid #000000;
  box-shadow: 3px 3px 0 #000000;
}

.model-inner div {
  min-height: 58px;
  display: grid;
  place-items: center;
  padding: 0.75rem;
  border-right: 1px solid #000000;
  background: var(--background);
  font-size: 12px;
}

.model-inner div:last-child {
  border-right: 0;
  background: var(--yellow);
}

.mode-graphic {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.mode-card,
.formula {
  border: 1px solid #c0bdad;
  background: var(--panel-light);
  box-shadow: 3px 3px 0 #c0bdad;
  padding: 1rem;
}

.mode-card.yellow {
  border-color: var(--yellow-dark);
  background: var(--yellow);
  box-shadow: 3px 3px 0 var(--yellow-dark);
}

.mode-card span {
  display: block;
  margin-bottom: 1.5rem;
  color: var(--muted);
  font-size: 10px;
  text-transform: uppercase;
}

.mode-card strong {
  font-size: 14px;
}

.formula {
  grid-column: 1 / -1;
  background: #111111;
  color: #ffffff;
  font-size: 12px;
  text-align: center;
}

.chart-panel {
  padding-bottom: 1.5rem;
}

.chart-title {
  width: max-content;
  margin-bottom: 2rem;
  padding: 0.5rem;
  background: var(--panel-light);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.2;
}

.eval-grid {
  display: grid;
  gap: 0.5rem;
  padding: 0.25rem;
}

.eval-head,
.eval-row {
  display: grid;
  grid-template-columns: minmax(150px, 1.1fr) minmax(180px, 1fr) minmax(180px, 1fr);
  gap: 0.75rem;
  align-items: center;
}

.eval-head {
  padding: 0.5rem 0.75rem;
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
}

.eval-row {
  border: 1px solid #c0bdad;
  background: var(--panel-light);
  box-shadow: 3px 3px 0 #c0bdad;
  padding: 0.75rem;
}

.eval-row.ours {
  border-color: #000000;
  box-shadow: 3px 3px 0 #000000;
}

.eval-row strong {
  font-size: 12px;
}

.metric-line {
  position: relative;
  height: 34px;
  border: 1px solid #000000;
  background: var(--background);
  overflow: hidden;
}

.metric-line span {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0;
  min-width: 8px;
  background: var(--yellow-dark);
}

.metric-line.freq-line span {
  background: var(--green);
}

.eval-row.ours .metric-line span {
  background: var(--yellow);
}

.eval-row.ours .metric-line.freq-line span {
  background: var(--soft-green);
}

.metric-line em {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  height: 100%;
  padding-right: 0.6rem;
  font-style: normal;
  font-weight: 700;
}

.legend {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 1.5rem;
  font-size: 10px;
}

.legend span {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.legend i {
  width: 12px;
  height: 12px;
  border: 1px solid #000000;
  box-shadow: 2px 2px 0 #000000;
}

.acc-key {
  background: var(--yellow-dark);
}

.freq-key {
  background: var(--green);
}

.chart-panel p {
  max-width: 54rem;
  margin: 1.25rem auto 0;
  font-size: 10px;
  font-style: italic;
  line-height: 1.5;
  text-align: center;
}

footer {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding: 1.5rem 0;
  border-top: 1px solid #000000;
}

footer p {
  margin: 0;
}

@media (max-width: 760px) {
  .page {
    padding: 1rem;
  }

  .topbar,
  footer {
    align-items: flex-start;
    flex-direction: column;
  }

  h1 {
    font-size: clamp(2.7rem, 14vw, 3.6rem);
  }

  .meta-grid {
    grid-template-columns: 1fr;
  }

  .meta-grid > div:nth-child(odd):not(:first-child) {
    margin-top: 0.5rem;
  }

  .stage-grid.three,
  .stage-grid.four,
  .model-inner,
  .mode-graphic,
  .carousel-strip,
  .eval-head,
  .eval-row {
    grid-template-columns: 1fr;
  }

  .arrow-row span {
    width: 48px;
    height: 40px;
  }
}