:root {
  color-scheme: dark;
  --bg: #0c1110;
  --surface: #111817;
  --surface-2: #16201e;
  --ink: #edf2ec;
  --muted: #9eaaa5;
  --line: rgba(237, 242, 236, 0.14);
  --accent: #b8f266;
  --accent-dark: #17210b;
  --blue: #8db7ff;
  --yellow: #ffd166;
  --red: #ff8e7a;
  --green: #89d79b;
  --shell: min(1160px, calc(100vw - 48px));
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 85% 3%, rgba(184, 242, 102, 0.08), transparent 28rem),
    radial-gradient(circle at 5% 26%, rgba(141, 183, 255, 0.06), transparent 30rem),
    var(--bg);
  line-height: 1.55;
}
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.section-shell { width: var(--shell); margin-inline: auto; }

.site-header {
  width: var(--shell);
  min-height: 78px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 12px; font-size: 0.9rem; font-weight: 700; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 31px;
  color: var(--accent);
  border: 1px solid var(--line);
  border-radius: 4px;
  font: 700 0.68rem ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.06em;
}
nav { display: flex; gap: 24px; color: var(--muted); font-size: 0.78rem; }
nav a:hover { color: var(--ink); }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.6fr);
  gap: clamp(50px, 8vw, 110px);
  align-items: end;
  min-height: 480px;
  padding: 78px 0 64px;
}
.eyebrow, .kicker, .small-label {
  margin: 0 0 17px;
  color: var(--accent);
  font-size: 0.7rem;
  font-weight: 750;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}
h1, h2, h3, p { text-wrap: pretty; }
h1 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(3.8rem, 7.7vw, 7rem);
  font-weight: 520;
  letter-spacing: -0.068em;
  line-height: 0.95;
}
.hero-copy {
  max-width: 720px;
  margin: 32px 0 0;
  color: #c8d0cc;
  font-size: clamp(1.08rem, 2vw, 1.42rem);
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 47px;
  padding: 0 19px;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-size: 0.84rem;
  font-weight: 700;
  transition: transform 150ms ease, background 150ms ease;
}
.button:hover { transform: translateY(-2px); }
.button.primary { color: #10150a; background: var(--accent); border-color: var(--accent); }
.button.ghost:hover { background: rgba(255,255,255,0.045); }

.question-card {
  padding: 28px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.025);
}
.question-card > p:nth-child(2) {
  margin: 0;
  font-size: 1.15rem;
  line-height: 1.55;
  letter-spacing: -0.015em;
}
.language-pills { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 27px; }
.language-pills span {
  padding: 6px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font: 0.7rem ui-monospace, SFMono-Regular, Menlo, monospace;
}

.about, .study, .results, .roadmap { padding: 122px 0; border-top: 1px solid var(--line); }
.section-heading { max-width: 900px; margin-bottom: 54px; }
.section-heading h2, .result-headline h2, .next h2, .details-hero h1 {
  margin: 0;
  font-size: clamp(2.65rem, 5.5vw, 5.2rem);
  font-weight: 520;
  letter-spacing: -0.058em;
  line-height: 1.03;
}
.section-intro {
  max-width: 720px;
  margin: 25px 0 0;
  color: var(--muted);
  font-size: 1rem;
}
.split-heading {
  max-width: none;
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: clamp(50px, 8vw, 105px);
  align-items: end;
}
.split-heading .section-intro { margin: 0; }

.principles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--line);
}
.principles-grid article { min-height: 270px; padding: 30px; border-right: 1px solid var(--line); }
.principles-grid article:last-child { border-right: 0; }
.index { color: var(--muted); font: 0.74rem ui-monospace, monospace; }
.principles-grid h3 { margin: 74px 0 12px; font-size: 1.35rem; letter-spacing: -0.03em; }
.principles-grid p { max-width: 31ch; margin: 0; color: var(--muted); font-size: 0.88rem; }

.task-explainer { display: grid; grid-template-columns: 1fr 1fr; gap: 17px; }
.prompt-card, .http-card { min-height: 430px; padding: 30px; border: 1px solid var(--line); background: var(--surface); }
.card-header {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  color: var(--muted);
  font: 0.69rem ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.card-header a { color: var(--accent); }
.prompt-card blockquote {
  margin: 65px 0 35px;
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  line-height: 1.35;
  letter-spacing: -0.035em;
}
.prompt-card > p:last-child, .http-card > p:last-child { margin: 0; color: var(--muted); font-size: 0.88rem; }
.http-card { background: #0f1514; }
.http-card .card-header { margin-bottom: 47px; }
.http-line {
  display: grid;
  grid-template-columns: 1fr 25px 1fr;
  gap: 11px;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.http-line code { color: #cbd3cf; font-size: 0.77rem; }
.http-line span { color: var(--muted); text-align: center; }
.http-line .success { color: var(--green); }
.http-line .failure { color: var(--red); }
.http-card > p:last-child { margin-top: 28px; }

.run-explainer { padding: 96px 0 122px; }
.run-flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
  padding: 0;
  list-style: none;
  border-block: 1px solid var(--line);
}
.run-flow li { min-height: 225px; padding: 27px; border-right: 1px solid var(--line); }
.run-flow li:first-child { padding-left: 0; }
.run-flow li:last-child { border-right: 0; }
.run-flow li > span { display: block; color: var(--accent); font: 0.76rem ui-monospace, monospace; }
.run-flow strong { display: block; margin-top: 55px; font-size: 1.05rem; }
.run-flow p { margin: 8px 0 0; color: var(--muted); font-size: 0.81rem; }

.result-headline { max-width: 940px; }
.result-headline > p:last-child {
  max-width: 760px;
  margin: 28px 0 0;
  color: #c4ccc8;
  font-size: 1.18rem;
}
.result-headline > p strong { color: var(--accent); }
.notation-explainer {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 45px;
  max-width: 850px;
  margin: 60px 0 32px;
  padding: 20px 0;
  border-block: 1px solid var(--line);
}
.notation-explainer strong { font-size: 0.88rem; }
.notation-explainer p { margin: 0; color: var(--muted); font-size: 0.87rem; }

.result-grid { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); }
.result-grid article { min-height: 230px; padding: 25px; border-right: 1px solid var(--line); }
.result-grid article:last-child { border-right: 0; }
.result-grid p { margin: 0 0 6px; color: var(--muted); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; }
.result-grid h3 { margin: 0; font-size: 1rem; }
.result-grid strong { display: block; margin-top: 58px; font-size: 2.7rem; font-weight: 520; letter-spacing: -0.06em; }
.result-grid span { color: var(--muted); font-size: 0.75rem; }

.interpretation-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 17px; margin-top: 17px; }
.finding-card { min-height: 300px; padding: 31px; border: 1px solid rgba(137,215,155,0.28); background: rgba(137,215,155,0.045); }
.finding-card.caution { border-color: rgba(255,209,102,0.3); background: rgba(255,209,102,0.04); }
.finding-card h3 { max-width: 28ch; margin: 65px 0 16px; font-size: 1.55rem; letter-spacing: -0.035em; }
.finding-card > p:last-child { max-width: 54ch; margin: 0; color: var(--muted); font-size: 0.88rem; }

.details-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  margin-top: 42px;
  padding-top: 30px;
  border-top: 1px solid var(--line);
}
.details-link strong { font-size: 0.9rem; }
.details-link p { margin: 5px 0 0; color: var(--muted); font-size: 0.82rem; }

.language-status { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); }
.language-status article { min-height: 260px; padding: 25px; border-right: 1px solid var(--line); }
.language-status article:last-child { border-right: 0; }
.language-status article > div { display: flex; align-items: center; gap: 10px; }
.language-status h3 { margin: 0; font-size: 1.1rem; }
.language-status p { margin: 51px 0 18px; color: var(--muted); font-size: 0.84rem; }
.language-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--yellow); }
.language-dot.ts { background: var(--blue); }
.language-dot.py { background: #6eb6dc; }
.language-dot.go { background: #77d5e9; }
.status { display: inline-block; font-size: 0.69rem; text-transform: uppercase; letter-spacing: 0.07em; }
.status.published { color: var(--green); }
.status.ready { color: var(--yellow); }
.calibration-note {
  max-width: 850px;
  margin: 30px 0 0;
  color: var(--muted);
  font-size: 0.83rem;
}

.next {
  display: grid;
  grid-template-columns: 1fr 0.8fr;
  gap: 90px;
  padding: 112px 0;
  border-top: 1px solid var(--line);
}
.next h2 { max-width: 760px; }
.next ul { margin: 5px 0 0; padding: 0; list-style: none; }
.next li { padding: 17px 0; border-bottom: 1px solid var(--line); color: #c9d0cd; font-size: 0.9rem; }
.next li::before { content: "→"; margin-right: 12px; color: var(--accent); }

footer {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  padding: 35px 0 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.76rem;
}
footer strong { color: var(--ink); }
footer p { margin: 5px 0 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-links a:hover { color: var(--ink); }

/* Result chart, reading grid, and expanded footer */
.chart-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 26px;
  margin: 34px 0 40px;
}
.chart-panel {
  margin: 0;
  padding: 24px 26px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}
.chart-panel figcaption { display: flex; flex-direction: column; gap: 5px; margin-bottom: 18px; }
.chart-panel figcaption strong { font-size: 1.02rem; letter-spacing: -0.02em; }
.chart-panel figcaption span { color: var(--muted); font-size: 0.81rem; max-width: 46ch; }
.chart-panel svg { display: block; overflow: visible; }
.chart-fallback { margin: 0; color: var(--muted); font-size: 0.85rem; }

.task-note {
  margin-top: 42px;
  padding: 26px 28px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}
.task-note > p { margin: 0 0 18px; color: #c9d0cd; font-size: 0.9rem; max-width: 88ch; }
.task-note strong { color: var(--ink); }

.reading-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin-top: 38px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}
.reading-grid article { padding: 28px 30px; background: var(--bg); }
.reading-grid h3 { margin: 0 0 10px; font-size: 1.1rem; letter-spacing: -0.02em; }
.reading-grid p { margin: 0; color: var(--muted); font-size: 0.88rem; }

.footer-columns { display: flex; flex-wrap: wrap; gap: 46px; }
.footer-group { display: flex; flex-direction: column; gap: 8px; }
.footer-heading {
  color: var(--ink);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
}
.footer-group a:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.footer-byline a { color: var(--accent); }
.footer-byline a:hover { text-decoration: underline; text-underline-offset: 3px; }
footer > div:first-child { max-width: 40ch; }

@media (max-width: 900px) {
  .chart-grid, .reading-grid { grid-template-columns: 1fr; }
  .footer-columns { gap: 28px; }
}

.spec-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  align-self: center;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}
.spec-strip > div { padding: 16px 18px; background: var(--surface); }
.spec-strip dt {
  color: var(--muted);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
}
.spec-strip dd { margin: 5px 0 0; font-size: 0.86rem; }
.spec-strip a { color: var(--accent); }
.spec-strip a:hover { text-decoration: underline; text-underline-offset: 3px; }

.notes { padding: 96px 0; border-top: 1px solid var(--line); }
/* Secondary section: keep the heading below the weight of the result headings. */
.notes h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); letter-spacing: -0.02em; }
.notes-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 34px 46px;
  margin: 34px 0 30px;
}
.notes-grid h3 { margin: 0 0 8px; font-size: 1rem; letter-spacing: -0.01em; }
.notes-grid p { margin: 0; color: var(--muted); font-size: 0.86rem; }

@media (max-width: 900px) {
  .notes-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .spec-strip { grid-template-columns: 1fr; }
  .notes { padding: 88px 0; }
}

/* Technical details */
.details-hero { padding: 95px 0 72px; }
.details-hero h1 { max-width: 900px; }
.details-hero > p:last-child { max-width: 760px; margin: 25px 0 0; color: var(--muted); font-size: 1.05rem; }
.details-section { padding: 78px 0; border-top: 1px solid var(--line); }
.details-section h2 { margin: 0 0 38px; font-size: clamp(2rem, 4vw, 3.5rem); font-weight: 520; letter-spacing: -0.05em; }
.definition-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.definition-grid article { padding: 25px; border: 1px solid var(--line); }
.definition-grid h3 { margin: 0 0 12px; font-size: 0.95rem; }
.definition-grid p { margin: 0; color: var(--muted); font-size: 0.84rem; }
.config-grid { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); }
.config-grid div { padding: 24px; border-right: 1px solid var(--line); }
.config-grid div:last-child { border-right: 0; }
.config-grid span { display: block; color: var(--muted); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; }
.config-grid strong { display: block; margin-top: 8px; font-size: 1rem; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.82rem; font-variant-numeric: tabular-nums; }
th, td { padding: 15px 13px; border-bottom: 1px solid var(--line); text-align: right; white-space: nowrap; }
th:first-child, td:first-child, th:nth-child(2), td:nth-child(2) { text-align: left; }
th { color: var(--muted); font-size: 0.68rem; font-weight: 650; text-transform: uppercase; letter-spacing: 0.07em; }
.details-note { max-width: 820px; color: var(--muted); font-size: 0.88rem; }
.details-note strong { color: var(--ink); }
.back-link { color: var(--accent); font-size: 0.84rem; }

@media (max-width: 900px) {
  :root { --shell: min(100% - 32px, 1160px); }
  nav a:not(:last-child) { display: none; }
  .hero { grid-template-columns: 1fr; min-height: auto; padding: 64px 0; }
  .question-card { max-width: 620px; }
  .principles-grid, .run-flow, .result-grid, .language-status, .config-grid { grid-template-columns: 1fr 1fr; }
  .principles-grid article:nth-child(2), .run-flow li:nth-child(2), .result-grid article:nth-child(2), .language-status article:nth-child(2), .config-grid div:nth-child(2) { border-right: 0; }
  .principles-grid article, .run-flow li, .result-grid article, .language-status article, .config-grid div { border-bottom: 1px solid var(--line); }
  .task-explainer, .split-heading, .next { grid-template-columns: 1fr; gap: 38px; }
  .split-heading .section-intro { margin-top: 0; }
  .definition-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
  .site-header { min-height: 68px; }
  nav a:not(:last-child) { display: none; }
  h1 { font-size: clamp(3.1rem, 15vw, 5rem); }
  .principles-grid, .run-flow, .result-grid, .language-status, .interpretation-grid, .definition-grid, .config-grid { grid-template-columns: 1fr; }
  .principles-grid article, .run-flow li, .result-grid article, .language-status article, .config-grid div { border-right: 0; }
  .task-explainer > article { padding: 22px; }
  .http-line { grid-template-columns: 1fr; gap: 5px; }
  .http-line span { text-align: left; }
  .notation-explainer { grid-template-columns: 1fr; gap: 8px; }
  .details-link, footer { align-items: flex-start; flex-direction: column; }
  .about, .study, .results, .roadmap { padding: 88px 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}

.source-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 22px;
  color: var(--muted);
  font-size: 0.76rem;
}
.source-strip a { color: var(--accent); }
.source-strip a:hover { text-decoration: underline; text-underline-offset: 3px; }


.at-a-glance {
  padding: 48px 0 82px;
  border-top: 1px solid var(--line);
}
.glance-heading {
  display: grid;
  grid-template-columns: 1fr 0.72fr;
  gap: 60px;
  align-items: end;
  margin-bottom: 30px;
}
.glance-heading h2 {
  max-width: 740px;
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.8rem);
  font-weight: 520;
  letter-spacing: -0.052em;
  line-height: 1.05;
}
.glance-heading > p {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
}
.glance-table-wrap { border: 1px solid var(--line); }
.glance-table th, .glance-table td { padding: 16px; }
.glance-table td:first-child { color: var(--ink); font-weight: 700; }
.glance-table td:nth-child(2) { color: var(--muted); }
.glance-table tbody tr:last-child td { border-bottom: 0; }
.glance-table .illustrative-row { background: rgba(255, 209, 102, 0.025); }
.glance-note { margin: 17px 0 0; color: var(--muted); font-size: 0.76rem; }
.glance-note a { color: var(--accent); }
@media (max-width: 760px) {
  .glance-heading { grid-template-columns: 1fr; gap: 16px; }
}

.family-reversal {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.family-reversal li {
  background: var(--surface-2);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  line-height: 1.5;
}

.family-reversal code {
  font-weight: 600;
}

.details-steps {
  margin: 0 0 1.25rem 1.1rem;
  padding: 0;
  display: grid;
  gap: 0.55rem;
  color: var(--muted);
  line-height: 1.6;
}

.details-steps li {
  padding-left: 0.35rem;
}