:root {
  color-scheme: light;
  --paper: #f8f6f0;
  --paper-raised: #fdfbf7;
  --navy: #0b2447;
  --navy-soft: #334967;
  --slate: #67758a;
  --blue: #1559ad;
  --blue-dark: #0b438b;
  --blue-soft: #e6effa;
  --blue-faint: #f0f5fb;
  --line: #d1d8e2;
  --line-strong: #aeb9c8;
  --red: #a93c32;
  --green: #2d6f4d;
  --shadow: 0 8px 24px rgb(27 50 80 / 8%);
  --radius: 7px;
  --shell: 1260px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  margin: 0;
  color: var(--navy);
  background:
    radial-gradient(circle at 86% 7%, rgb(224 234 247 / 32%), transparent 30rem),
    var(--paper);
  font-family: "Aptos", "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.48;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

.page-shell {
  width: min(var(--shell), calc(100% - 56px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 30;
  padding: 10px 14px;
  color: var(--paper-raised);
  background: var(--navy);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgb(248 246 240 / 95%);
  backdrop-filter: blur(12px);
}

.nav {
  display: grid;
  min-height: 74px;
  grid-template-columns: minmax(270px, 1fr) auto minmax(180px, 1fr);
  gap: 30px;
  align-items: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  justify-self: start;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
}

.brand-seal,
.footer-seal {
  display: grid;
  place-items: center;
  border: 1px solid var(--navy);
  color: var(--paper-raised);
  background: var(--navy);
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.brand-seal {
  width: 41px;
  height: 41px;
  border-radius: 5px;
  font-size: 15px;
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  font-size: 14px;
  font-weight: 650;
}

.nav-links a,
.nav-star {
  text-decoration: none;
}

.nav-links a {
  padding-block: 8px;
  transition: color 150ms ease;
}

.nav-links a:hover {
  color: var(--blue);
}

.nav-star {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  justify-self: end;
  padding: 0 16px;
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  background: var(--paper-raised);
  font-size: 13px;
  font-weight: 750;
  white-space: nowrap;
  transition:
    border-color 150ms ease,
    color 150ms ease,
    box-shadow 150ms ease,
    transform 120ms ease;
}

.nav-star:hover {
  border-color: var(--blue);
  color: var(--blue-dark);
  box-shadow: 0 4px 12px rgb(20 88 173 / 9%);
}

main > section {
  border-bottom: 1px solid var(--line);
}

.hero {
  display: grid;
  min-height: 595px;
  grid-template-columns: minmax(0, 0.98fr) minmax(470px, 1.02fr);
  gap: 70px;
  align-items: center;
  padding-block: 56px;
}

.hook,
.section-label {
  margin: 0;
  color: var(--blue-dark);
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

h1,
.section-intro h2,
.hero-stack h2,
.star-conversion h2,
.footer-layout p,
.case-ticker {
  font-family: Georgia, "Times New Roman", serif;
}

h1 {
  max-width: 650px;
  margin: 13px 0 0;
  font-size: clamp(4rem, 5.2vw, 5.5rem);
  font-weight: 600;
  letter-spacing: -0.037em;
  line-height: 0.98;
}

.hero-subhead {
  max-width: 640px;
  margin: 25px 0 0;
  color: var(--navy-soft);
  font-size: 18px;
  line-height: 1.45;
}

.identity-line {
  margin: 16px 0 0;
  color: var(--navy);
  font-size: 16px;
  font-weight: 650;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  min-height: 47px;
  align-items: center;
  justify-content: center;
  gap: 13px;
  padding: 0 18px;
  border: 1px solid var(--blue);
  border-radius: 5px;
  font-size: 14px;
  font-weight: 750;
  text-decoration: none;
  white-space: nowrap;
  transition:
    color 150ms ease,
    background-color 150ms ease,
    border-color 150ms ease,
    box-shadow 150ms ease,
    transform 120ms ease;
}

.button-primary {
  color: var(--paper-raised);
  background: var(--navy);
  border-color: var(--navy);
}

.button-primary:hover {
  background: var(--blue-dark);
  border-color: var(--blue-dark);
}

.button-secondary {
  color: var(--blue-dark);
  background: transparent;
}

.button-secondary:hover {
  background: var(--blue-soft);
  box-shadow: 0 4px 12px rgb(20 88 173 / 8%);
}

.button-star {
  color: var(--navy);
  background: var(--paper-raised);
  border-color: var(--line-strong);
}

.button-star:hover {
  color: var(--blue-dark);
  border-color: var(--blue);
  box-shadow: 0 4px 12px rgb(20 88 173 / 8%);
}

.button:active,
.nav-star:active,
.case-card:active,
.star-conversion > a:active {
  transform: translateY(1px);
}

.hero-stack {
  padding: 24px 26px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgb(253 251 247 / 84%);
  box-shadow: var(--shadow);
}

.hero-stack h2 {
  margin: 0;
  font-size: 16px;
  text-align: center;
}

.mini-stack {
  display: grid;
  gap: 7px;
  margin-top: 17px;
}

.mini-layer {
  display: grid;
  grid-template-columns: minmax(155px, 0.75fr) 1.25fr;
  gap: 18px;
  align-items: center;
  min-height: 70px;
  padding: 13px 17px;
  border: 1px solid #c8d7e9;
  border-radius: 6px;
  background: var(--blue-faint);
}

.mini-layer-emphasis {
  border-color: #9cb9da;
  background: #eaf1f9;
}

.mini-layer-output {
  border-color: var(--blue);
  background: var(--blue-soft);
}

.mini-layer > span {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 16px;
  font-weight: 700;
}

.mini-layer p {
  margin: 0;
  color: var(--navy-soft);
  font-size: 13px;
}

.stack-arrow {
  color: var(--blue);
  font-size: 20px;
  line-height: 1;
  text-align: center;
}

.problem,
.core-system,
.attribution-module,
.cases,
.quick-start {
  padding-block: 38px;
}

.problem {
  display: grid;
  grid-template-columns: minmax(310px, 0.72fr) minmax(0, 1.28fr);
  gap: 70px;
}

.section-intro h2 {
  max-width: 760px;
  margin: 9px 0 0;
  font-size: clamp(2rem, 3.2vw, 3.2rem);
  font-weight: 600;
  letter-spacing: -0.028em;
  line-height: 1.05;
}

.problem-content {
  padding-left: 34px;
  border-left: 1px solid var(--line-strong);
}

.problem-content ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 13px 28px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.problem-content li {
  position: relative;
  padding-left: 25px;
  color: var(--navy-soft);
}

.problem-content li::before {
  position: absolute;
  left: 0;
  color: var(--red);
  content: "×";
  font-weight: 800;
}

.problem-conclusion {
  margin: 26px 0 0;
  padding: 14px 17px;
  border-left: 3px solid var(--blue);
  background: var(--blue-faint);
}

.core-system {
  display: grid;
  grid-template-columns: minmax(280px, 0.65fr) minmax(0, 1.35fr);
  gap: 70px;
  align-items: start;
}

.system-layers {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--paper-raised);
}

.system-layers article {
  display: grid;
  grid-template-columns: 44px minmax(210px, 1fr) minmax(190px, 0.85fr);
  gap: 17px;
  align-items: center;
  min-height: 65px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}

.system-layers article:last-child {
  border-bottom: 0;
}

.layer-key {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 4px;
  color: var(--paper-raised);
  background: var(--blue-dark);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  font-weight: 750;
}

.system-layers h3,
.system-layers p {
  margin: 0;
}

.system-layers h3 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 16px;
}

.system-layers p {
  margin-top: 2px;
  color: var(--slate);
  font-size: 12px;
}

.system-layers strong {
  color: var(--navy-soft);
  font-size: 13px;
  font-weight: 600;
}

.system-statement {
  grid-column: 2;
  margin: 14px 0 0;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f1f3f5;
  font-weight: 650;
}

.compact-intro {
  max-width: 780px;
}

.attribution-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  gap: 13px;
  align-items: center;
  margin-top: 25px;
}

.attribution-layer {
  display: grid;
  min-height: 230px;
  grid-template-rows: auto auto 1fr auto;
  padding: 19px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-raised);
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease;
}

.attribution-layer:hover {
  border-color: #8eabd0;
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.layer-hypotheses {
  background: #f5f6f5;
}

.layer-weighting {
  background: var(--blue-faint);
}

.layer-output {
  border-color: var(--blue);
  background: var(--blue-soft);
}

.module-index {
  color: var(--blue-dark);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  font-weight: 750;
}

.attribution-layer h3 {
  margin: 12px 0 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 19px;
  line-height: 1.16;
}

.attribution-layer > p {
  margin: 12px 0 0;
  color: var(--navy-soft);
  font-size: 13px;
}

.module-arrow {
  color: var(--blue);
  font-size: 24px;
}

.confidence-ui {
  margin-top: 17px;
}

.confidence-ui strong {
  display: block;
  margin-bottom: 8px;
  color: var(--navy-soft);
  font-size: 11px;
  text-transform: uppercase;
}

.dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-right: 5px;
  border-radius: 50%;
  background: #d3d8de;
}

.dot.active {
  background: var(--blue);
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 24px;
}

.case-card {
  display: grid;
  min-height: 275px;
  grid-template-rows: auto auto auto 1fr;
  padding: 23px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-raised);
  box-shadow: 0 3px 12px rgb(27 50 80 / 5%);
  text-decoration: none;
  transition:
    border-color 170ms ease,
    box-shadow 170ms ease,
    transform 170ms ease;
}

.case-card:hover {
  border-color: var(--blue);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.case-card-selected {
  border: 1.5px solid var(--blue);
  background: linear-gradient(145deg, var(--blue-faint), var(--paper-raised) 64%);
  box-shadow: 0 8px 22px rgb(20 88 173 / 10%);
}

.case-ticker {
  color: var(--navy);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
}

.case-card-selected .case-ticker {
  color: var(--blue);
}

.case-card h3 {
  margin: 12px 0 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
  line-height: 1.22;
}

.case-card > p {
  margin: 13px 0 0;
  color: var(--navy-soft);
  font-size: 14px;
}

.case-insight {
  align-self: end;
  margin-top: 20px;
  padding-top: 15px;
  border-top: 1px solid var(--line);
}

.case-insight strong,
.case-insight span {
  display: block;
}

.case-insight strong {
  color: var(--blue-dark);
  font-size: 12px;
  text-transform: uppercase;
}

.case-insight span {
  margin-top: 6px;
  color: var(--slate);
  font-size: 13px;
}

.quick-start {
  display: grid;
  grid-template-columns: minmax(250px, 0.58fr) minmax(0, 1.42fr);
  gap: 58px;
  align-items: center;
}

.quick-start h2 {
  margin: 8px 0 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 31px;
  line-height: 1.08;
}

.quick-start-copy > p:last-child {
  margin: 13px 0 0;
  color: var(--navy-soft);
}

.quick-start-tools {
  min-width: 0;
}

pre {
  margin: 0;
  max-width: 100%;
  overflow-x: auto;
  border-radius: var(--radius);
  background: #101d2e;
  color: #e8eef6;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.quick-start code {
  display: block;
  min-width: 730px;
  padding: 16px 19px;
  font-size: 12px;
  line-height: 1.8;
}

.quick-start code span {
  display: block;
  white-space: nowrap;
}

.quick-start code b {
  color: #8bd19c;
}

.reasoning-prompt {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 13px 0 0;
  padding: 0;
  list-style: none;
}

.reasoning-prompt li {
  display: flex;
  min-height: 56px;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--paper-raised);
  font-size: 13px;
  font-weight: 650;
}

.reasoning-prompt span {
  display: grid;
  width: 25px;
  height: 25px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 50%;
  color: var(--paper-raised);
  background: var(--blue-dark);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11px;
}

.star-conversion {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 42px;
  align-items: center;
  margin-block: 38px;
  padding: 31px 34px;
  border: 1px solid #b8cbe2;
  border-radius: var(--radius);
  background: linear-gradient(110deg, var(--blue-faint), #f8f4e9);
}

.star-conversion h2 {
  max-width: 800px;
  margin: 8px 0 0;
  font-size: clamp(2rem, 3vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.08;
}

.star-conversion p:last-child {
  margin: 12px 0 0;
  color: var(--navy-soft);
}

.star-conversion > a {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 20px;
  border: 1px solid var(--navy);
  border-radius: 5px;
  color: var(--paper-raised);
  background: var(--navy);
  font-size: 14px;
  font-weight: 750;
  text-decoration: none;
  white-space: nowrap;
  transition:
    background-color 150ms ease,
    border-color 150ms ease,
    transform 120ms ease;
}

.star-conversion > a:hover {
  border-color: var(--blue-dark);
  background: var(--blue-dark);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #eff1f3;
}

.footer-layout {
  display: grid;
  min-height: 112px;
  grid-template-columns: 72px 1fr auto;
  gap: 26px;
  align-items: center;
}

.footer-seal {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  outline: 1px solid var(--line-strong);
  outline-offset: 5px;
}

.footer-layout > div {
  text-align: center;
}

.footer-layout p {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
}

.footer-layout p span {
  padding-inline: 12px;
  color: var(--blue);
}

.footer-layout small {
  display: block;
  margin-top: 5px;
  color: var(--slate);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 13px;
}

.footer-layout > a {
  color: var(--blue-dark);
  font-size: 13px;
  font-weight: 750;
  text-underline-offset: 4px;
}

:focus-visible {
  outline: 3px solid #79a6d8;
  outline-offset: 3px;
}

@media (max-width: 1080px) {
  .nav {
    grid-template-columns: 1fr auto;
  }

  .nav-links {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .hero-copy,
  .hero-stack {
    max-width: 790px;
  }

  .problem,
  .core-system {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .problem-content {
    padding-left: 0;
    border-left: 0;
  }

  .system-statement {
    grid-column: 1;
  }

  .attribution-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .module-arrow {
    display: none;
  }

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

  .case-card {
    min-height: 230px;
  }
}

@media (max-width: 760px) {
  .page-shell {
    width: min(100% - 32px, var(--shell));
  }

  html {
    scroll-padding-top: 68px;
  }

  .nav {
    min-height: 66px;
    gap: 14px;
  }

  .brand {
    gap: 9px;
    font-size: 13px;
    line-height: 1.15;
  }

  .brand span:last-child {
    max-width: 145px;
  }

  .brand-seal {
    width: 36px;
    height: 36px;
    font-size: 13px;
  }

  .nav-star {
    min-height: 38px;
    padding-inline: 10px;
    font-size: 12px;
  }

  .hero {
    min-height: 0;
    padding-block: 47px 42px;
  }

  h1 {
    font-size: clamp(3.25rem, 15vw, 4.5rem);
  }

  .hero-subhead {
    font-size: 16px;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }

  .hero-stack {
    padding: 20px 16px;
  }

  .mini-layer {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .problem,
  .core-system,
  .attribution-module,
  .cases,
  .quick-start {
    padding-block: 31px;
  }

  .problem-content ul {
    grid-template-columns: 1fr;
  }

  .system-layers article {
    grid-template-columns: 42px minmax(0, 1fr);
  }

  .system-layers strong {
    grid-column: 2;
  }

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

  .attribution-layer {
    min-height: 205px;
  }

  .quick-start {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .quick-start-tools {
    min-width: 0;
  }

  .reasoning-prompt {
    grid-template-columns: 1fr;
  }

  .star-conversion {
    grid-template-columns: 1fr;
    padding: 27px 23px;
  }

  .star-conversion > a {
    justify-self: start;
  }

  .footer-layout {
    min-height: 0;
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 16px;
    padding-block: 28px;
  }

  .footer-layout p {
    font-size: 16px;
  }

  .footer-layout p span {
    padding-inline: 5px;
  }
}

@media (max-width: 420px) {
  .brand span:last-child {
    max-width: 116px;
  }

  .nav-star {
    font-size: 11px;
  }

  .footer-layout p span {
    display: block;
    padding: 2px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}