:root {
  --font-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-serif: "IBM Plex Serif", Georgia, "Times New Roman", serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

  --neutral-0: #ffffff;
  --neutral-50: #faf9f7;
  --neutral-100: #f4f2ee;
  --neutral-200: #e8e4dc;
  --neutral-300: #d5cfc3;
  --neutral-400: #a7a195;
  --neutral-500: #716b5f;
  --neutral-600: #5a554c;
  --neutral-700: #403d37;
  --neutral-800: #2b2924;
  --neutral-900: #1a1917;
  --neutral-950: #0e0d0b;
  --accent-50: #eff4ff;
  --accent-400: #3b82f6;
  --accent-500: #1d4ed8;
  --accent-600: #1e40af;
  --accent-on-dark: #76a7ff;

  --canvas: var(--neutral-50);
  --surface: var(--neutral-0);
  --surface-muted: var(--neutral-100);
  --border: var(--neutral-200);
  --border-strong: var(--neutral-300);
  --text-primary: var(--neutral-900);
  --text-secondary: var(--neutral-600);
  --text-inverse: var(--neutral-0);
  --ring: var(--accent-400);
  --visual-offset: var(--neutral-200);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --duration-short: 180ms;
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);
  --shell: 75rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

.skip-link {
  position: fixed;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 100;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--neutral-950);
  color: var(--neutral-0);
  font-weight: 600;
  transform: translateY(-180%);
  transition: transform var(--duration-short) var(--ease-standard);
}

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

.shell {
  width: min(100% - 6rem, var(--shell));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--border);
  background: var(--canvas);
}

.header-inner {
  display: flex;
  min-height: 4rem;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

.brand {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  gap: var(--space-3);
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.brand img {
  border-radius: var(--radius-md);
}

.site-header nav,
.site-footer nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.site-header nav a,
.site-footer nav a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  padding-inline: var(--space-1);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--duration-short) var(--ease-standard);
}

.site-header nav a:hover,
.site-footer nav a:hover {
  color: var(--text-primary);
}

.hero {
  padding-block: clamp(4.5rem, 9vw, 8rem);
  border-bottom: 1px solid var(--border);
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: center;
  gap: clamp(3rem, 5vw, 6rem);
}

.eyebrow {
  margin: 0 0 var(--space-5);
  color: var(--accent-600);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: var(--space-6);
  font-family: var(--font-serif);
  font-size: clamp(3rem, 5vw, 4.5rem);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 0.98;
}

.hero-line {
  display: block;
}

h1 em {
  color: var(--accent-500);
  font-weight: 500;
}

h2 {
  max-width: 18ch;
  margin-bottom: var(--space-6);
  font-family: var(--font-serif);
  font-size: clamp(2.25rem, 4.2vw, 3.75rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.05;
}

h3 {
  font-size: 1.25rem;
  line-height: 1.4;
}

.hero-lead,
.section-intro > p:last-child,
.boundary-intro > p:last-child,
.evidence-copy > p,
.format-heading > p,
.release-note-grid > div:last-child > p:first-child {
  color: var(--text-secondary);
  font-size: 1.125rem;
  line-height: 1.6;
}

.hero-lead {
  max-width: 35rem;
  margin-bottom: var(--space-4);
}

.hero-detail {
  max-width: 32rem;
  margin: 0 0 var(--space-8);
  padding-left: var(--space-4);
  border-left: 2px solid var(--accent-500);
  color: var(--text-secondary);
  line-height: 1.6;
}

.release-action {
  max-width: 32rem;
}

.primary-action {
  display: inline-flex;
  min-height: 3.25rem;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  padding: var(--space-3) var(--space-5);
  border: 1px solid var(--accent-500);
  border-radius: var(--radius-md);
  background: var(--accent-500);
  color: var(--neutral-0);
  font-weight: 600;
  text-decoration: none;
  transition:
    background-color var(--duration-short) var(--ease-standard),
    border-color var(--duration-short) var(--ease-standard);
}

.primary-action:hover {
  border-color: var(--accent-600);
  background: var(--accent-600);
}

.primary-action:active {
  background: var(--neutral-950);
  border-color: var(--neutral-950);
}

.release-action p {
  margin: var(--space-3) 0 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

code,
pre {
  font-family: var(--font-mono);
}

.release-action code {
  color: var(--text-primary);
}

.row-window {
  position: relative;
  margin: 0;
  padding: var(--space-6);
  border: 1px solid var(--neutral-700);
  border-radius: var(--radius-lg);
  background: var(--neutral-950);
  color: var(--neutral-50);
  box-shadow: 18px 18px 0 var(--visual-offset);
}

.figure-label {
  margin-bottom: var(--space-6);
  color: var(--neutral-300);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.file-scale {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
  color: var(--neutral-400);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.file-scale-track {
  position: relative;
  height: 2px;
  background: var(--neutral-700);
}

.file-scale-window {
  position: absolute;
  top: -3px;
  left: 42%;
  width: 15%;
  height: 8px;
  border: 2px solid var(--accent-400);
  background: var(--neutral-950);
}

.row-table {
  overflow: hidden;
  border: 1px solid var(--neutral-700);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.row-table-head,
.row-table-line {
  display: grid;
  grid-template-columns: 5rem minmax(7rem, 1fr) minmax(6rem, 0.75fr);
}

.row-table-head {
  background: var(--neutral-800);
  color: var(--neutral-300);
  font-size: 0.75rem;
  font-weight: 500;
}

.row-table-head span,
.row-table-line span {
  min-width: 0;
  padding: var(--space-3) var(--space-4);
  overflow: hidden;
  border-right: 1px solid var(--neutral-700);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.row-table-head span:last-child,
.row-table-line span:last-child {
  border-right: 0;
}

.row-table-line {
  border-top: 1px solid var(--neutral-800);
}

.row-table-line span:first-child {
  color: var(--neutral-400);
}

.row-table-line.is-active {
  background: #172a56;
  box-shadow: inset 3px 0 0 var(--accent-400);
}

.row-window figcaption {
  margin-top: var(--space-5);
  color: var(--neutral-400);
  font-size: 0.75rem;
  line-height: 1.5;
}

.orientation {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.capture-section {
  background: var(--surface);
}

.capture-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(18rem, 0.95fr);
  align-items: end;
  gap: clamp(3rem, 8vw, 8rem);
  margin-bottom: var(--space-10);
}

.capture-heading h2,
.capture-heading p {
  margin-bottom: 0;
}

.capture-heading > p {
  color: var(--text-secondary);
  font-size: 1.125rem;
  line-height: 1.6;
}

.app-capture {
  margin: 0;
}

.app-capture-link {
  display: block;
  padding: clamp(0.375rem, 0.8vw, 0.75rem);
  border: 1px solid var(--neutral-700);
  border-radius: var(--radius-lg);
  background: var(--neutral-950);
  text-decoration: none;
  transition: border-color var(--duration-short) var(--ease-standard);
}

.app-capture-link:hover {
  border-color: var(--accent-400);
}

.app-capture-link img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  background: var(--neutral-0);
}

.app-capture figcaption {
  display: flex;
  justify-content: space-between;
  gap: var(--space-6);
  margin-top: var(--space-4);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.app-capture figcaption strong {
  color: var(--text-primary);
  font-weight: 600;
}

.principle-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding-block: var(--space-6);
}

.principle-strip div {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
  padding-inline: var(--space-6);
  border-left: 1px solid var(--border);
}

.principle-strip div:first-child {
  padding-left: 0;
  border-left: 0;
}

.principle-strip div:last-child {
  padding-right: 0;
}

.principle-strip strong {
  font-size: 0.875rem;
  font-weight: 600;
}

.principle-strip span {
  overflow: hidden;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.section {
  padding-block: clamp(5rem, 10vw, 8rem);
  border-bottom: 1px solid var(--border);
}

.split-section,
.boundary-grid,
.evidence-grid,
.release-note-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  gap: clamp(3rem, 8vw, 8rem);
}

.hero-grid > *,
.split-section > *,
.boundary-grid > *,
.evidence-grid > *,
.release-note-grid > *,
.format-heading > * {
  min-width: 0;
}

.section-intro > p:last-child,
.boundary-intro > p:last-child {
  max-width: 34rem;
  margin-bottom: 0;
}

.pipeline {
  align-self: center;
  border-top: 1px solid var(--border-strong);
}

.pipeline-step {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: var(--space-4);
  padding-block: var(--space-5);
  border-bottom: 1px solid var(--border-strong);
}

.step-number {
  color: var(--accent-600);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
}

.pipeline-step div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-6);
}

.pipeline-step strong {
  font-weight: 600;
}

.pipeline-step div span {
  color: var(--text-secondary);
  font-size: 0.875rem;
  text-align: right;
}

.formats-section {
  background: var(--surface);
}

.format-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(18rem, 0.85fr);
  align-items: end;
  gap: clamp(3rem, 8vw, 8rem);
  margin-bottom: var(--space-16);
}

.format-heading h2,
.format-heading p {
  margin-bottom: 0;
}

.format-list {
  border-top: 1px solid var(--border-strong);
}

.format-row {
  display: grid;
  grid-template-columns: minmax(8rem, 0.6fr) minmax(0, 1.65fr) minmax(9rem, 0.75fr);
  align-items: baseline;
  gap: var(--space-6);
  padding-block: var(--space-6);
  border-bottom: 1px solid var(--border-strong);
}

.format-row h3,
.format-row p {
  margin: 0;
}

.format-row h3 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 500;
}

.format-row p {
  color: var(--text-secondary);
}

.format-row > span {
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-align: right;
}

.limits-section {
  background: var(--neutral-100);
}

.limits-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-8);
}

.limits-heading h2 {
  max-width: 20ch;
}

.limit-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: var(--space-12) 0 var(--space-6);
  border-block: 1px solid var(--border-strong);
}

.limit-strip div {
  padding: var(--space-8) var(--space-6);
  border-left: 1px solid var(--border-strong);
}

.limit-strip div:first-child {
  padding-left: 0;
  border-left: 0;
}

.limit-strip div:last-child {
  padding-right: 0;
}

.limit-strip dt {
  margin-bottom: var(--space-2);
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.1;
}

.limit-strip dd {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.limits-note {
  max-width: 49rem;
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.boundary-section {
  background: var(--neutral-950);
  color: var(--neutral-50);
}

.boundary-section .eyebrow {
  color: #76a7ff;
}

.boundary-intro > p:last-child {
  color: var(--neutral-300);
}

.boundary-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--neutral-700);
  list-style: none;
}

.boundary-list li {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: var(--space-4);
  padding-block: var(--space-5);
  border-bottom: 1px solid var(--neutral-700);
}

.boundary-list li > span {
  color: #76a7ff;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.boundary-list p {
  margin: 0;
  color: var(--neutral-300);
}

.boundary-list strong {
  color: var(--neutral-50);
  font-weight: 600;
}

.evidence-section {
  background: var(--surface);
}

.evidence-copy > p {
  max-width: 40rem;
}

.text-link {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  gap: var(--space-2);
  color: var(--accent-600);
  font-weight: 600;
}

.release-note-section {
  padding-block: clamp(4rem, 8vw, 6rem);
  border-bottom: 1px solid var(--border);
  background: #fff8e8;
}

.release-note-section .eyebrow {
  color: #78350f;
}

.release-note-section h2 {
  font-size: clamp(2rem, 3.4vw, 3rem);
}

pre {
  width: 100%;
  max-width: 100%;
  margin: var(--space-6) 0;
  padding: var(--space-4);
  overflow-x: auto;
  border: 1px solid #d6c9a9;
  border-radius: var(--radius-md);
  background: #fffdf8;
  color: #33270d;
  font-size: 0.8125rem;
  line-height: 1.6;
}

.small-copy {
  margin-bottom: 0;
  color: #5f533b;
  font-size: 0.875rem;
}

.site-footer {
  padding-block: var(--space-12);
  background: var(--surface);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--space-8);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.footer-brand img {
  border-radius: var(--radius-sm);
}

.footer-brand p {
  display: flex;
  flex-direction: column;
  margin: 0;
}

.footer-brand strong {
  font-size: 0.875rem;
}

.footer-brand span,
.footer-meta {
  color: var(--text-secondary);
  font-size: 0.75rem;
}

.footer-meta {
  grid-column: 1 / -1;
  margin: 0;
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: var(--neutral-950);
    --surface: var(--neutral-900);
    --surface-muted: var(--neutral-800);
    --border: var(--neutral-800);
    --border-strong: var(--neutral-700);
    --text-primary: var(--neutral-50);
    --text-secondary: var(--neutral-300);
    --text-inverse: var(--neutral-950);
    --visual-offset: var(--neutral-800);
  }

  .site-header {
    background: var(--neutral-950);
  }

  h1 em,
  .eyebrow,
  .step-number,
  .text-link {
    color: var(--accent-on-dark);
  }

  .formats-section,
  .evidence-section,
  .site-footer,
  .orientation {
    background: var(--neutral-900);
  }

  .limits-section {
    background: var(--neutral-900);
  }

  .release-note-section {
    background: #261e0e;
  }

  .release-note-section .eyebrow {
    color: #f4c76b;
  }

  .release-note-grid > div:last-child > p:first-child,
  .small-copy {
    color: #e2d6ba;
  }

  pre {
    border-color: #65563a;
    background: #171207;
    color: #fff4d9;
  }

  .primary-action:active {
    border-color: var(--neutral-50);
    background: var(--neutral-50);
    color: var(--neutral-950);
  }
}

@media (max-width: 64rem) {
  .shell {
    width: min(100% - 4rem, var(--shell));
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: var(--space-16);
  }

  .hero-copy {
    max-width: 46rem;
  }

  .row-window {
    width: min(100%, 46rem);
  }

  .split-section,
  .boundary-grid,
  .evidence-grid,
  .release-note-grid {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }

  .section-intro,
  .boundary-intro,
  .evidence-grid > div:first-child,
  .release-note-grid > div:first-child {
    max-width: 42rem;
  }

  .format-heading {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .capture-heading {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

@media (max-width: 48rem) {
  .shell {
    width: min(100% - 2.5rem, var(--shell));
  }

  .site-header nav {
    gap: var(--space-5);
  }

  .site-header .nav-section {
    display: none;
  }

  .hero {
    padding-block: var(--space-16);
  }

  h1 {
    font-size: clamp(2.625rem, 12vw, 4rem);
  }

  .primary-action {
    width: 100%;
  }

  .row-window {
    padding: var(--space-4);
    box-shadow: 10px 10px 0 var(--visual-offset);
  }

  .principle-strip {
    grid-template-columns: repeat(2, 1fr);
    gap: 0;
  }

  .principle-strip div {
    padding: var(--space-4);
    border-bottom: 1px solid var(--border);
  }

  .principle-strip div:nth-child(odd) {
    padding-left: 0;
    border-left: 0;
  }

  .principle-strip div:nth-child(even) {
    padding-right: 0;
  }

  .principle-strip div:nth-child(n + 3) {
    border-bottom: 0;
  }

  .section {
    padding-block: var(--space-20);
  }

  .pipeline-step div {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
  }

  .pipeline-step div span {
    text-align: left;
  }

  .format-row {
    grid-template-columns: 1fr;
    gap: var(--space-2);
    padding-block: var(--space-5);
  }

  .format-row > span {
    text-align: left;
  }

  .limit-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .limit-strip div {
    padding: var(--space-6) var(--space-4);
    border-bottom: 1px solid var(--border-strong);
  }

  .limit-strip div:nth-child(odd) {
    padding-left: 0;
    border-left: 0;
  }

  .limit-strip div:nth-child(even) {
    padding-right: 0;
  }

  .limit-strip div:nth-child(n + 3) {
    border-bottom: 0;
  }

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

  .app-capture figcaption {
    flex-direction: column;
    gap: var(--space-1);
  }

  .site-footer nav {
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-6);
  }

  .footer-meta {
    grid-column: auto;
  }
}

@media (max-width: 25rem) {
  .shell {
    width: calc(100% - 2rem);
  }

  .row-table-head,
  .row-table-line {
    grid-template-columns: 4.5rem minmax(6rem, 1fr);
  }

  .row-table-head span:last-child,
  .row-table-line span:last-child {
    display: none;
  }

  .row-table-head span:nth-child(2),
  .row-table-line span:nth-child(2) {
    border-right: 0;
  }

  .limit-strip {
    grid-template-columns: 1fr;
  }

  .limit-strip div,
  .limit-strip div:nth-child(even),
  .limit-strip div:nth-child(odd) {
    padding-inline: 0;
    border-left: 0;
    border-bottom: 1px solid var(--border-strong);
  }

  .limit-strip div:last-child {
    border-bottom: 0;
  }
}

@media (prefers-contrast: more) {
  :root {
    --border: var(--neutral-500);
    --border-strong: var(--neutral-600);
  }

  .primary-action {
    border-width: 2px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}