:root {
  color-scheme: dark;
  --bg: #07070a;
  --surface: #0c0c11;
  --surface-2: #131319;
  --text: #f3f3f5;
  --muted: #a4a4ae;
  --dim: #6c6c78;
  --line: rgba(243, 243, 245, 0.12);
  --line-strong: rgba(243, 243, 245, 0.22);
  --accent: #7c9cff;
  --accent-soft: rgba(124, 156, 255, 0.14);
  --glow: rgba(181, 221, 255, 0.22);
  --success: #76d99b;
  --shadow: rgba(0, 0, 0, 0.38);
  --display: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
  --body: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --radius: 18px;
  --page: 1240px;
}

html[data-theme="paper"] {
  color-scheme: light;
  --bg: #f5f2ea;
  --surface: #fffdf7;
  --surface-2: #ebe7dc;
  --text: #151619;
  --muted: #565b63;
  --dim: #777c82;
  --line: rgba(21, 22, 25, 0.13);
  --line-strong: rgba(21, 22, 25, 0.24);
  --accent: #3159c7;
  --accent-soft: rgba(49, 89, 199, 0.11);
  --glow: rgba(49, 89, 199, 0.11);
  --success: #257a47;
  --shadow: rgba(28, 25, 18, 0.12);
}

html[data-theme="terminal"] {
  color-scheme: dark;
  --bg: #040806;
  --surface: #07110b;
  --surface-2: #0b1a11;
  --text: #d8ffe1;
  --muted: #8db897;
  --dim: #52745a;
  --line: rgba(121, 255, 153, 0.16);
  --line-strong: rgba(121, 255, 153, 0.32);
  --accent: #79ff99;
  --accent-soft: rgba(121, 255, 153, 0.1);
  --glow: rgba(121, 255, 153, 0.13);
  --success: #79ff99;
  --shadow: rgba(0, 0, 0, 0.5);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 78% 8%, var(--glow), transparent 30rem),
    var(--bg);
  color: var(--text);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.6;
  transition: background-color 180ms ease, color 180ms ease;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.42), transparent 62%);
  opacity: 0.33;
}

a {
  color: inherit;
}

a:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 20;
  padding: 8px 12px;
  background: var(--text);
  color: var(--bg);
  transform: translateY(-180%);
}

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

.site-frame {
  width: min(calc(100% - 40px), var(--page));
  margin-inline: auto;
}

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 96px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--display);
  font-size: 20px;
  font-weight: 650;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.brand img {
  border-radius: 7px;
  box-shadow: 0 0 24px var(--glow);
}

.brand-dot,
em,
.index,
code {
  color: var(--accent);
}

.build-state {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.mast-actions,
.site-nav {
  display: flex;
  align-items: center;
}

.mast-actions {
  gap: 28px;
}

.site-nav {
  gap: 6px;
}

.site-nav a {
  padding: 8px 10px;
  border-radius: 7px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: var(--accent-soft);
  color: var(--text);
}

.status-light {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 12px var(--success);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(340px, 0.85fr);
  gap: clamp(48px, 8vw, 112px);
  align-items: center;
  min-height: min(780px, calc(100vh - 96px));
  padding: 96px 0;
}

.eyebrow {
  margin: 0 0 22px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  font-family: var(--display);
}

h1 {
  max-width: 820px;
  margin-bottom: 28px;
  font-size: clamp(56px, 8vw, 108px);
  font-weight: 520;
  letter-spacing: -0.065em;
  line-height: 0.88;
}

h1 em {
  font-style: normal;
  font-weight: 420;
}

.lede {
  max-width: 650px;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.55;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 46px;
  padding: 10px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.button:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--bg);
}

.button.quiet {
  background: var(--surface);
}

.system-map {
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  box-shadow: 0 28px 90px var(--shadow);
}

.map-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  color: var(--dim);
  font-family: var(--mono);
  font-size: 11px;
}

.map-state {
  color: var(--success);
}

.system-map ol {
  margin: 0;
  padding: 8px 0;
  list-style: none;
}

.system-map li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 0 12px;
  padding: 15px 18px;
  border-bottom: 1px solid var(--line);
}

.system-map li:last-child {
  border-bottom: 0;
}

.system-map li > span {
  grid-row: 1 / 3;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 11px;
}

.system-map strong {
  font-size: 14px;
}

.system-map small {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 10px;
}

.notes,
.construction {
  padding: 112px 0;
  border-top: 1px solid var(--line);
}

.section-intro {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px 88px;
  align-items: end;
  margin-bottom: 54px;
}

.section-intro .eyebrow {
  grid-column: 1 / -1;
  margin-bottom: -20px;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(38px, 5vw, 64px);
  font-weight: 520;
  letter-spacing: -0.05em;
  line-height: 1;
}

.section-intro > p:last-child {
  margin-bottom: 0;
  color: var(--muted);
}

.principles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.principles article {
  min-height: 300px;
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, var(--surface), color-mix(in srgb, var(--surface) 68%, transparent));
}

.index {
  display: block;
  margin-bottom: 48px;
  font-family: var(--mono);
  font-size: 11px;
}

h3 {
  margin-bottom: 12px;
  font-size: 24px;
  letter-spacing: -0.025em;
}

.principles p {
  max-width: 56ch;
  margin-bottom: 26px;
  color: var(--muted);
}

code {
  font-family: var(--mono);
  font-size: 11px;
}

.construction {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 80px;
  align-items: start;
}

.construction h2 {
  font-size: clamp(34px, 4vw, 54px);
}

.construction dl {
  margin: 0;
  border-top: 1px solid var(--line-strong);
}

.construction dl > div {
  display: grid;
  grid-template-columns: 140px 1fr;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.construction dt {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
}

.construction dd {
  margin: 0;
  font-size: 14px;
}

.footer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 36px;
  align-items: end;
  padding: 42px 0 34px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.footer p {
  margin-bottom: 3px;
}

.footer-copy strong {
  color: var(--text);
}

.display-controls {
  display: flex;
  gap: 14px;
}

.display-controls label {
  display: grid;
  gap: 7px;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

select {
  min-width: 142px;
  padding: 10px 34px 10px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  background: var(--surface-2);
  color: var(--text);
  font: 13px var(--body);
}

.copyright {
  grid-column: 1 / -1;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* Console: denser, wider, and visibly operational. */
html[data-layout="console"] {
  --page: 1480px;
  --radius: 7px;
}

html[data-layout="console"] body {
  font-family: var(--mono);
}

html[data-layout="console"] .masthead {
  min-height: 72px;
}

html[data-layout="console"] .hero {
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.75fr);
  min-height: 640px;
  padding: 64px 0;
}

html[data-layout="console"] h1,
html[data-layout="console"] h2,
html[data-layout="console"] h3 {
  font-family: var(--mono);
  letter-spacing: -0.045em;
}

html[data-layout="console"] h1 {
  font-size: clamp(48px, 6.5vw, 92px);
}

html[data-layout="console"] .notes,
html[data-layout="console"] .construction {
  padding: 72px 0;
}

html[data-layout="console"] .principles {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

html[data-layout="console"] .principles article {
  min-height: 360px;
  padding: 28px;
}

/* Ledger: narrow, linear, and optimized for reading the system in order. */
html[data-layout="ledger"] {
  --page: 980px;
  --radius: 0;
}

html[data-layout="ledger"] body::before {
  background-size: 100% 40px;
}

html[data-layout="ledger"] .hero,
html[data-layout="ledger"] .section-intro,
html[data-layout="ledger"] .construction {
  grid-template-columns: 1fr;
}

html[data-layout="ledger"] .hero {
  min-height: auto;
  padding: 120px 0 90px;
}

html[data-layout="ledger"] .hero-copy {
  max-width: 840px;
}

html[data-layout="ledger"] .system-map {
  max-width: none;
  box-shadow: none;
}

html[data-layout="ledger"] .section-intro .eyebrow {
  margin-bottom: 0;
}

html[data-layout="ledger"] .principles {
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--line-strong);
}

html[data-layout="ledger"] .principles article {
  display: grid;
  grid-template-columns: 56px 0.55fr 1fr;
  gap: 28px;
  min-height: 0;
  padding: 32px 0;
  border-width: 0 0 1px;
  background: transparent;
}

html[data-layout="ledger"] .principles .index,
html[data-layout="ledger"] .principles h3,
html[data-layout="ledger"] .principles p {
  margin: 0;
}

html[data-layout="ledger"] .principles code {
  grid-column: 2 / -1;
}

@media (max-width: 980px) {
  .hero,
  .section-intro,
  .construction,
  html[data-layout="console"] .hero {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .system-map {
    max-width: 640px;
  }

  html[data-layout="console"] .principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .site-frame {
    width: min(calc(100% - 28px), var(--page));
  }

  .masthead {
    min-height: 76px;
  }

  .build-state {
    font-size: 9px;
  }

  .mast-actions {
    gap: 8px;
  }

  .site-nav a {
    padding-inline: 7px;
    font-size: 9px;
  }

  .mast-actions .build-state {
    display: none;
  }

  .hero,
  html[data-layout="console"] .hero,
  html[data-layout="ledger"] .hero {
    padding: 72px 0;
  }

  h1 {
    font-size: clamp(48px, 16vw, 72px);
  }

  .notes,
  .construction,
  html[data-layout="console"] .notes,
  html[data-layout="console"] .construction {
    padding: 72px 0;
  }

  .principles,
  html[data-layout="console"] .principles {
    grid-template-columns: 1fr;
  }

  .principles article {
    min-height: 0;
  }

  html[data-layout="ledger"] .principles article {
    grid-template-columns: 36px 1fr;
  }

  html[data-layout="ledger"] .principles p,
  html[data-layout="ledger"] .principles code {
    grid-column: 2;
  }

  .construction dl > div {
    grid-template-columns: 110px 1fr;
  }

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

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

  select {
    width: 100%;
    min-width: 0;
  }
}

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

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