:root {
  --bg: #070b12;
  --panel: rgba(16, 21, 31, 0.82);
  --panel-strong: rgba(18, 24, 37, 0.92);
  --line: rgba(140, 177, 233, 0.18);
  --text: #eef5ff;
  --muted: #a5b2c8;
  --blue: #74c4ff;
  --amber: #ff9b42;
  --ice: #deefff;
  --shadow: 0 21px 55px rgba(0, 0, 0, 0.42);
  --s-0: 8px;
  --s-1: 13px;
  --s-2: 21px;
  --s-3: 34px;
  --s-4: 55px;
  --s-5: 89px;
  --s-6: 144px;
  --measure-tight: 34ch;
  --measure: 55ch;
  --measure-wide: 89ch;
  --radius-sm: 13px;
  --radius-md: 21px;
  --radius-lg: 34px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  color: var(--text);
  min-height: 100vh;
  background:
    radial-gradient(circle at 20% 0%, rgba(116, 196, 255, 0.12), transparent 24%),
    radial-gradient(circle at 80% 10%, rgba(255, 155, 66, 0.12), transparent 20%),
    linear-gradient(180deg, #05070d 0%, #0a1019 48%, #05070d 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: var(--s-4) var(--s-4);
  mask-image: radial-gradient(circle at center, black 32%, transparent 85%);
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

p,
ul,
ol,
pre,
figure {
  margin: 0;
}

code,
pre {
  font-family: "IBM Plex Mono", monospace;
}

.page-shell {
  width: min(1680px, calc(100vw - var(--s-2)));
  margin: 0 auto;
  padding-bottom: var(--s-4);
}

.shell-row,
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-3);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  padding: var(--s-2) 0;
  backdrop-filter: blur(13px);
  background: linear-gradient(180deg, rgba(7,11,18,0.94), rgba(7,11,18,0.34));
}

.brand {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.21em;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
  color: var(--muted);
  font-size: 0.89rem;
}

.page-flow {
  display: grid;
  gap: var(--s-4);
}

.phi-section {
  position: relative;
}

.phi-pair {
  display: grid;
  gap: var(--s-3);
  align-items: center;
}

.phi-pair-hero {
  grid-template-columns: minmax(0, 1.236fr) minmax(0, 1fr);
}

.phi-pair-copy {
  grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
}

.hero {
  align-items: start;
  padding: var(--s-3) 0 var(--s-2);
}

.section-stack,
.copy-stack {
  display: grid;
  gap: var(--s-2);
}

.copy-stack-hero {
  align-content: center;
}

.copy-stack > p,
.section-heading > p,
.section-stack > p {
  max-width: var(--measure);
}

.section-heading {
  max-width: var(--measure-wide);
  margin-bottom: var(--s-1);
}

.centered-copy {
  justify-items: center;
  text-align: center;
}

.eyebrow {
  color: var(--blue);
  font-size: 0.84rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.03;
  letter-spacing: -0.04em;
}

.hero h1 {
  max-width: 15ch;
  font-size: clamp(2.55rem, 4.2vw, 4.5rem);
}

h2,
.section-heading h2,
.copy-stack > h2 {
  max-width: 16ch;
  font-size: clamp(1.85rem, 3.6vw, 3.4rem);
}

h3 {
  font-size: clamp(1rem, 1.2vw, 1.18rem);
}

.lead,
.section-heading p,
.copy-stack > p,
.info-card p,
.problem-grid p,
.link-card span {
  color: var(--muted);
  line-height: 1.62;
}

.lead {
  max-width: var(--measure);
  color: var(--ice);
  font-size: clamp(1rem, 1.2vw, 1.08rem);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-1);
  margin: var(--s-1) 0 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--s-4);
  padding: var(--s-1) var(--s-2);
  border-radius: 999px;
  border: 1px solid var(--line);
  font-weight: 700;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.button.primary {
  background: linear-gradient(135deg, rgba(116,196,255,0.18), rgba(255,155,66,0.18));
}

.button.secondary {
  background: rgba(255,255,255,0.03);
}

.button:hover,
.link-card:hover {
  transform: translateY(-3px);
  border-color: rgba(222,239,255,0.28);
  background: rgba(16, 22, 36, 0.96);
}

.point-list,
.hero-points {
  list-style: none;
  padding: 0;
  display: grid;
  gap: var(--s-1);
  color: var(--ice);
  max-width: var(--measure);
}

.point-list li,
.hero-points li {
  padding-left: var(--s-2);
  position: relative;
}

.point-list li::before,
.hero-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: var(--s-0);
  height: var(--s-0);
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), var(--amber));
  box-shadow: 0 0 13px rgba(116, 196, 255, 0.7);
}

.art-frame,
.hero-visual,
.kernel-visual,
.loop-visual {
  position: relative;
  aspect-ratio: 1.618 / 1;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(222,239,255,0.14);
  box-shadow: var(--shadow);
  background: var(--panel);
}

.art-frame img,
.hero-visual img,
.kernel-visual img,
.loop-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.art-frame-hero {
  align-self: start;
  margin-top: var(--s-2);
}

.card-grid {
  display: grid;
  gap: var(--s-2);
}

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

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

.info-card,
.problem-grid article,
.feature-card,
.demo-card,
.link-card {
  display: grid;
  align-content: start;
  gap: var(--s-1);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
  padding: var(--s-2);
}

.problem-grid .info-card,
.feature-card,
.link-card {
  min-height: var(--s-6);
}

.demo-card {
  min-height: 233px;
}

.problem-grid span,
.feature-card h3,
.demo-card h3,
.link-card strong {
  display: block;
  color: var(--ice);
}

.problem-section,
.demo-panel,
.start-section {
  padding: var(--s-2) 0;
}

.demo-card pre {
  overflow: auto;
  white-space: pre-wrap;
  font-size: 0.89rem;
  line-height: 1.62;
  color: var(--ice);
}

.demo-card.output {
  background: linear-gradient(180deg, rgba(116,196,255,0.07), rgba(255,255,255,0.02)), var(--panel-strong);
}

.link-card {
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.site-footer {
  display: grid;
  justify-items: center;
  padding: var(--s-4) 0 var(--s-0);
  color: var(--muted);
  text-align: center;
  font-size: 0.9rem;
}

.machine-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.45rem 0.7rem;
  color: rgba(165, 178, 200, 0.82);
  font-size: 0.78rem;
}

.machine-links a {
  color: inherit;
  text-decoration: none;
}

.machine-links a:hover,
.machine-links a:focus-visible {
  color: var(--ice);
  text-decoration: underline;
}

.docs-page .doc-main {
  padding: var(--s-3) 0 var(--s-2);
}

.doc-hero {
  max-width: 76ch;
  margin-bottom: var(--s-3);
}

.doc-hero h1 {
  margin: 0 0 var(--s-1);
  line-height: 1.02;
  letter-spacing: -0.04em;
  font-size: clamp(2.2rem, 5vw, 4.2rem);
}

.doc-prose {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
  padding: var(--s-3);
  max-width: 900px;
}

.doc-prose a {
  color: var(--blue);
  text-decoration: underline;
  text-decoration-color: rgba(116, 196, 255, 0.5);
  text-underline-offset: 0.18em;
}

.doc-prose a:hover {
  color: var(--ice);
  text-decoration-color: rgba(222, 239, 255, 0.8);
}

.doc-prose p,
.doc-prose li,
.doc-prose blockquote {
  color: var(--muted);
  line-height: 1.75;
}

.doc-prose h1,
.doc-prose h2,
.doc-prose h3,
.doc-prose h4 {
  color: var(--ice);
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.doc-prose h1 { font-size: clamp(2rem, 4vw, 3rem); }
.doc-prose h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); margin-top: 2.2rem; }
.doc-prose h3 { font-size: 1.25rem; margin-top: 1.6rem; }

.doc-prose hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2rem 0;
}

.doc-prose ul,
.doc-prose ol {
  padding-left: 1.4rem;
}

.doc-prose li + li {
  margin-top: 0.35rem;
}

.doc-prose code {
  color: var(--ice);
  background: rgba(116, 196, 255, 0.08);
  border: 1px solid rgba(116, 196, 255, 0.12);
  padding: 0.08rem 0.34rem;
  border-radius: var(--s-0);
}

.doc-prose pre {
  margin: 1.2rem 0;
  overflow: auto;
  white-space: pre-wrap;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: var(--s-2);
  color: var(--ice);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.02);
}

.doc-prose pre code {
  background: transparent;
  border: 0;
  padding: 0;
  border-radius: 0;
}

.doc-prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2rem 0;
  font-size: 0.95rem;
}

.doc-prose th,
.doc-prose td {
  border: 1px solid var(--line);
  padding: 0.75rem 0.8rem;
  text-align: left;
  vertical-align: top;
}

.doc-prose th {
  color: var(--ice);
  background: rgba(116, 196, 255, 0.08);
}

.doc-prose blockquote {
  margin: 1.2rem 0;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid rgba(116, 196, 255, 0.55);
}

.doc-prose strong {
  color: var(--ice);
}

.doc-prose .highlighter-rouge,
.doc-prose div.highlighter-rouge {
  margin: 1.2rem 0;
}

@media (max-width: 1080px) {
  .phi-pair,
  .phi-pair-hero,
  .phi-pair-copy,
  .card-grid-three,
  .card-grid-two {
    grid-template-columns: 1fr;
  }

  .art-frame-hero {
    margin-top: 0;
  }
}

@media (max-width: 980px) {
  .page-shell {
    width: min(100vw - var(--s-3), 1560px);
  }

  .shell-row,
  .site-header {
    flex-direction: column;
    gap: var(--s-1);
    align-items: flex-start;
  }

  .site-nav {
    gap: var(--s-1);
  }

  .page-flow {
    gap: var(--s-3);
  }

  .doc-prose {
    padding: var(--s-2);
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100vw - var(--s-2), 1560px);
  }

  .hero h1 {
    max-width: 14ch;
    font-size: clamp(2.1rem, 13vw, 3.4rem);
  }

  h2,
  .section-heading h2,
  .copy-stack > h2 {
    max-width: 15ch;
    font-size: clamp(1.7rem, 10vw, 2.6rem);
  }

  .button {
    width: 100%;
    text-align: center;
  }

  .art-frame,
  .hero-visual,
  .kernel-visual,
  .loop-visual {
    aspect-ratio: 1.35 / 1;
    border-radius: var(--radius-md);
  }

  .info-card,
  .problem-grid article,
  .feature-card,
  .demo-card,
  .link-card,
  .doc-prose {
    padding: var(--s-2);
    border-radius: var(--radius-md);
  }
}