@layer reset, base, components, layout, responsive;

@layer reset {
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }

  html {
    scroll-behavior: smooth;
    text-size-adjust: 100%;
  }

  body,
  h1,
  h2,
  h3,
  p,
  figure,
  dl,
  dd,
  ol,
  ul,
  pre {
    margin: 0;
  }

  ol,
  ul {
    padding: 0;
    list-style: none;
  }

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

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

  button,
  input,
  textarea,
  select {
    font: inherit;
  }
}

@layer base {
  :root {
    --ink: #111827;
    --ink-soft: #29364a;
    --paper: #f5f3ed;
    --surface: #fffdf7;
    --surface-muted: #e9ece6;
    --line: #c9cec9;
    --line-strong: #808b91;
    --muted: #5d6870;
    --orange: #c2410c;
    --orange-dark: #9a3412;
    --orange-light: #ffb488;
    --orange-soft: #ffeadc;
    --sky: #0284c7;
    --sky-dark: #075985;
    --sky-soft: #dff3ff;
    --green: #0f6b56;
    --green-soft: #d9f3e9;
    --deep: #101827;
    --deep-raised: #172238;
    --deep-line: #354158;
    --deep-muted: #aeb8ca;
    --warm-dark: #2a2020;
    --warm-line: #65504a;
    --font-display: "Arial Narrow", "Aptos Display", "Segoe UI Variable Display", sans-serif;
    --font-body: Aptos, "Segoe UI Variable Text", "Segoe UI", system-ui, sans-serif;
    --font-mono: "Cascadia Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
    --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;
    --radius-sm: 0.3rem;
    --radius-md: 0.8rem;
    --shadow-panel: 0.7rem 0.7rem 0 rgb(17 24 39 / 10%);
  }

  body {
    min-width: 20rem;
    overflow-x: clip;
    color: var(--ink);
    background: var(--paper);
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
  }

  body::before {
    position: fixed;
    z-index: -1;
    inset: 0;
    content: "";
    pointer-events: none;
    background-image:
      linear-gradient(rgb(17 24 39 / 4%) 1px, transparent 1px),
      linear-gradient(90deg, rgb(17 24 39 / 4%) 1px, transparent 1px);
    background-size: 4rem 4rem;
  }

  h1,
  h2,
  h3 {
    font-family: var(--font-display);
    font-weight: 750;
    line-height: 1.02;
    text-wrap: balance;
  }

  h1 {
    font-size: clamp(3.6rem, 7.5vw, 7.1rem);
    letter-spacing: -0.067em;
  }

  h2 {
    font-size: clamp(2.5rem, 5vw, 4.7rem);
    letter-spacing: -0.052em;
  }

  h3 {
    font-size: 1.3rem;
    letter-spacing: -0.025em;
  }

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

  ::selection {
    color: #fff;
    background: var(--sky-dark);
  }

  :focus-visible {
    outline: 0.2rem solid var(--orange);
    outline-offset: 0.25rem;
  }
}

@layer components {
  .page-shell {
    width: min(76rem, calc(100% - 3rem));
    margin-inline: auto;
  }

  .skip-link {
    position: fixed;
    z-index: 200;
    top: var(--space-3);
    left: var(--space-3);
    padding: var(--space-2) var(--space-4);
    color: #fff;
    background: var(--ink);
    transform: translateY(-180%);
  }

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

  .wordmark {
    display: inline-flex;
    gap: var(--space-3);
    align-items: center;
    font-family: var(--font-display);
    font-size: 1.18rem;
    font-weight: 800;
    letter-spacing: -0.035em;
  }

  .wordmark img {
    width: 2rem;
    height: 2rem;
  }

  .eyebrow {
    display: flex;
    gap: var(--space-3);
    align-items: center;
    color: var(--sky-dark);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 800;
    line-height: 1.4;
    letter-spacing: 0.12em;
    text-transform: uppercase;
  }

  .eyebrow::before {
    width: 1.8rem;
    height: 0.15rem;
    content: "";
    background: var(--orange);
  }

  .eyebrow--light {
    color: #bfe8ff;
  }

  .eyebrow--warm {
    color: var(--orange-light);
  }

  .button {
    display: inline-flex;
    gap: var(--space-3);
    align-items: center;
    justify-content: center;
    min-height: 3.2rem;
    padding: 0.8rem 1.25rem;
    border: 0.0625rem solid transparent;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 800;
    line-height: 1.2;
    transition: transform 160ms ease, color 160ms ease, background-color 160ms ease, border-color 160ms ease;
  }

  .button:hover {
    transform: translateY(-0.15rem);
  }

  .button--primary {
    color: #fff;
    background: var(--orange);
    box-shadow: 0.28rem 0.28rem 0 var(--ink);
  }

  .button--primary:hover {
    background: var(--orange-dark);
  }

  .button--secondary {
    padding-inline: var(--space-2);
    border-bottom-color: var(--line-strong);
    border-radius: 0;
  }

  .button--secondary:hover {
    color: var(--sky-dark);
    border-bottom-color: var(--sky);
  }

  .button--outline {
    color: var(--ink);
    border-color: var(--line-strong);
    background: transparent;
  }

  .button--outline:hover {
    color: var(--sky-dark);
    border-color: var(--sky);
    background: var(--sky-soft);
  }

  .text-link {
    display: inline-flex;
    gap: var(--space-2);
    align-items: center;
    padding-bottom: var(--space-1);
    color: var(--sky-dark);
    border-bottom: 0.0625rem solid;
    font-size: 0.88rem;
    font-weight: 800;
    line-height: 1.3;
  }

  .text-link:hover {
    color: var(--orange-dark);
  }

  .text-link--light {
    color: #c9edff;
  }

  .text-link--light:hover {
    color: #ffb488;
  }

  .tag {
    display: inline-flex;
    align-items: center;
    min-height: 1.7rem;
    padding: 0.25rem 0.5rem;
    color: var(--sky-dark);
    border: 0.0625rem solid #94cce9;
    border-radius: 999px;
    background: var(--sky-soft);
    font-family: var(--font-mono);
    font-size: 0.62rem;
    font-weight: 800;
    line-height: 1;
    letter-spacing: 0.05em;
    text-transform: uppercase;
  }

  .status-dot {
    display: inline-block;
    width: 0.45rem;
    height: 0.45rem;
    border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 0 0.22rem rgb(20 125 100 / 17%);
  }

  .copy-buffer {
    position: fixed;
    top: 0;
    left: 0;
    width: 1px;
    height: 1px;
    opacity: 0;
    pointer-events: none;
  }
}

@layer layout {
  .site-header {
    position: sticky;
    z-index: 100;
    top: 0;
    border-bottom: 0.0625rem solid rgb(128 139 145 / 45%);
    background: rgb(245 243 237 / 91%);
    backdrop-filter: blur(1rem);
  }

  .header-inner {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--space-8);
    align-items: center;
    width: min(76rem, calc(100% - 3rem));
    min-height: 4.5rem;
    margin-inline: auto;
  }

  .primary-nav {
    display: flex;
    gap: var(--space-8);
    align-items: center;
    justify-content: center;
    color: var(--ink-soft);
    font-size: 0.84rem;
    font-weight: 700;
  }

  .primary-nav a {
    position: relative;
    padding-block: var(--space-2);
  }

  .primary-nav a::after {
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    height: 0.13rem;
    content: "";
    background: var(--orange);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 160ms ease;
  }

  .primary-nav a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
  }

  .header-actions {
    display: flex;
    gap: var(--space-3);
    align-items: center;
    justify-self: end;
  }

  .header-inner--simple {
    grid-template-columns: 1fr auto;
  }

  .language-link,
  .github-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.2rem;
    padding: 0.45rem 0.68rem;
    border: 0.0625rem solid var(--line-strong);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 800;
  }

  .language-link:hover,
  .github-link:hover {
    color: #fff;
    border-color: var(--ink);
    background: var(--ink);
  }

  .mobile-menu {
    display: none;
  }

  .hero {
    display: grid;
    grid-template-columns: minmax(0, 0.88fr) minmax(31rem, 1.12fr);
    gap: clamp(var(--space-10), 5vw, var(--space-20));
    align-items: center;
    min-height: calc(100svh - 4.5rem);
    padding-block: clamp(var(--space-16), 8vw, 7.5rem);
  }

  .hero-copy h1 {
    max-width: 10ch;
    margin-top: var(--space-6);
  }

  .hero-copy h1 span,
  .hero-copy h1 strong {
    display: block;
  }

  .hero-copy h1 strong {
    color: var(--orange);
    font-weight: inherit;
  }

  .hero-body {
    max-width: 39rem;
    margin-top: var(--space-8);
    color: var(--ink-soft);
    font-size: clamp(1.04rem, 1.8vw, 1.23rem);
    line-height: 1.67;
  }

  .hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-5);
    align-items: center;
    margin-top: var(--space-8);
  }

  .boundary-note {
    display: flex;
    gap: var(--space-2);
    align-items: flex-start;
    max-width: 38rem;
    margin-top: var(--space-6);
    color: var(--muted);
    font-size: 0.78rem;
  }

  .boundary-note > span {
    display: inline-grid;
    flex: none;
    place-items: center;
    width: 1.25rem;
    height: 1.25rem;
    border: 0.0625rem solid var(--line-strong);
    border-radius: 50%;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-style: normal;
  }

  .lab-map {
    position: relative;
    border: 0.0625rem solid var(--ink);
    border-radius: var(--radius-sm);
    background: var(--surface);
    box-shadow: var(--shadow-panel);
  }

  .lab-map::before,
  .lab-map::after {
    position: absolute;
    z-index: -1;
    width: 5rem;
    height: 5rem;
    content: "";
    border-color: var(--sky);
  }

  .lab-map::before {
    top: -0.75rem;
    left: -0.75rem;
    border-top: 0.18rem solid var(--sky);
    border-left: 0.18rem solid var(--sky);
  }

  .lab-map::after {
    right: -0.75rem;
    bottom: -0.75rem;
    border-right: 0.18rem solid var(--sky);
    border-bottom: 0.18rem solid var(--sky);
  }

  .lab-map__topbar {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    min-height: 2.8rem;
    padding-inline: var(--space-4);
    border-bottom: 0.0625rem solid var(--ink);
    background: var(--surface-muted);
    font-family: var(--font-mono);
    font-size: 0.64rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .panel-lights {
    display: flex;
    gap: 0.38rem;
  }

  .panel-lights i {
    width: 0.52rem;
    height: 0.52rem;
    border: 0.0625rem solid var(--line-strong);
    border-radius: 50%;
    background: var(--surface);
  }

  .panel-lights i:first-child {
    border-color: var(--orange-dark);
    background: var(--orange);
  }

  .panel-state {
    display: inline-flex;
    gap: var(--space-2);
    align-items: center;
    justify-self: end;
    color: var(--green);
  }

  .lab-map__body {
    display: grid;
    grid-template-columns: minmax(0, 0.8fr) 4.5rem minmax(0, 1.2fr);
    min-height: 26rem;
  }

  .command-rail {
    display: grid;
    align-content: center;
    padding: var(--space-6);
    background:
      repeating-linear-gradient(-45deg, transparent, transparent 0.55rem, rgb(17 24 39 / 3%) 0.55rem 1.1rem),
      #eef0eb;
  }

  .map-label {
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.62rem;
    font-weight: 800;
    letter-spacing: 0.09em;
    text-transform: uppercase;
  }

  .command-rail strong {
    margin-top: var(--space-4);
    font-family: var(--font-display);
    font-size: 1.7rem;
    line-height: 1.05;
  }

  .command-rail code {
    margin-top: var(--space-5);
    color: var(--sky-dark);
    font-size: 0.7rem;
    overflow-wrap: anywhere;
  }

  .command-rail ul {
    display: grid;
    gap: var(--space-2);
    margin-top: var(--space-8);
  }

  .command-rail li {
    display: flex;
    gap: var(--space-2);
    align-items: center;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.62rem;
  }

  .command-rail li::before {
    width: 0.42rem;
    height: 0.42rem;
    content: "";
    border-radius: 50%;
    background: var(--orange);
  }

  .mode-boundary {
    display: grid;
    grid-template-rows: auto 1fr auto;
    place-items: center;
    padding-block: var(--space-5);
    color: var(--orange-light);
    border-inline: 0.0625rem solid var(--ink);
    background: var(--ink);
  }

  .mode-boundary span {
    font-family: var(--font-mono);
    font-size: 0.56rem;
    font-weight: 800;
    line-height: 1;
    letter-spacing: 0.11em;
    text-transform: uppercase;
    writing-mode: vertical-rl;
  }

  .mode-boundary i {
    position: relative;
    width: 0.12rem;
    height: calc(100% - 2rem);
    margin-block: var(--space-4);
    background: currentColor;
  }

  .mode-boundary i::before,
  .mode-boundary i::after {
    position: absolute;
    left: 50%;
    width: 0.55rem;
    height: 0.55rem;
    content: "";
    border: 0.12rem solid currentColor;
    background: var(--ink);
    transform: translateX(-50%) rotate(45deg);
  }

  .mode-boundary i::before {
    top: 0;
  }

  .mode-boundary i::after {
    bottom: 0;
  }

  .mode-stack {
    display: grid;
    gap: var(--space-4);
    align-content: start;
    padding: var(--space-5);
    background: var(--sky-soft);
  }

  .mode-card {
    position: relative;
    padding: var(--space-5);
    border: 0.0625rem solid var(--line);
    background: var(--surface);
  }

  .mode-card--active {
    overflow: hidden;
    border-color: var(--sky);
    box-shadow: 0.25rem 0.25rem 0 #b9e4fa;
  }

  .mode-card--active::after {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 0.12rem;
    content: "";
    background: var(--orange);
    box-shadow: 0 0 1rem rgb(249 115 22 / 70%);
    animation: scan 5s ease-in-out infinite;
  }

  .mode-card__head {
    display: flex;
    gap: var(--space-3);
    align-items: center;
    justify-content: space-between;
  }

  .mode-card__head > span:first-child {
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.6rem;
    font-weight: 800;
    letter-spacing: 0.08em;
  }

  .map-status {
    display: inline-flex;
    gap: 0.35rem;
    align-items: center;
    padding: 0.24rem 0.42rem;
    color: var(--green);
    border: 0.0625rem solid var(--green);
    border-radius: 999px;
    background: var(--green-soft);
    font-family: var(--font-mono);
    font-size: 0.56rem;
    font-weight: 800;
    line-height: 1;
  }

  .map-status::before {
    width: 0.32rem;
    height: 0.32rem;
    content: "";
    border-radius: 50%;
    background: currentColor;
  }

  .mode-card h2 {
    margin-top: var(--space-4);
    font-size: 1.45rem;
    letter-spacing: -0.035em;
  }

  .mode-card p {
    margin-top: var(--space-2);
    color: var(--muted);
    font-size: 0.72rem;
    line-height: 1.5;
  }

  .daemon-row,
  .node-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-4);
  }

  .daemon-row span,
  .node-row span {
    padding: 0.23rem 0.42rem;
    color: var(--muted);
    border: 0.0625rem solid var(--line);
    background: #fff;
    font-family: var(--font-mono);
    font-size: 0.55rem;
    line-height: 1.2;
  }

  .lab-map__ports {
    display: grid;
    grid-template-columns: auto repeat(3, 1fr);
    align-items: center;
    min-height: 3.5rem;
    padding-inline: var(--space-4);
    border-top: 0.0625rem solid var(--ink);
    border-bottom: 0.0625rem solid var(--line);
    background: var(--surface);
  }

  .lab-map__ports > span {
    padding-right: var(--space-4);
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.58rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
  }

  .lab-map__ports code {
    padding: 0.38rem var(--space-2);
    color: var(--sky-dark);
    border-left: 0.0625rem solid var(--line);
    background: #f4fbff;
    font-size: 0.62rem;
    text-align: center;
  }

  .lab-map figcaption {
    padding: var(--space-3) var(--space-4);
    color: var(--muted);
    font-size: 0.71rem;
    line-height: 1.5;
    text-align: center;
  }

  .fact-strip {
    color: #fff;
    border-block: 0.0625rem solid var(--ink);
    background: var(--deep);
  }

  .fact-strip__inner {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }

  .fact {
    display: grid;
    gap: var(--space-1);
    align-content: center;
    min-height: 8rem;
    padding: var(--space-6) var(--space-8);
    border-left: 0.0625rem solid var(--deep-line);
  }

  .fact:last-child {
    border-right: 0.0625rem solid var(--deep-line);
  }

  .fact span {
    color: #8fa2bd;
    font-family: var(--font-mono);
    font-size: 0.6rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
  }

  .fact strong {
    font-family: var(--font-display);
    font-size: 1.28rem;
    line-height: 1.3;
  }

  .fact small {
    color: var(--deep-muted);
    font-size: 0.73rem;
  }

  .section {
    padding-block: clamp(var(--space-20), 10vw, 9rem);
    scroll-margin-top: 4.5rem;
  }

  .section-heading--split {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(20rem, 0.8fr);
    gap: var(--space-16);
    align-items: end;
  }

  .section-heading h2 {
    max-width: 14ch;
    margin-top: var(--space-5);
  }

  .section-heading > p,
  .section-heading__aside > p {
    max-width: 37rem;
    color: var(--muted);
    font-size: 1.04rem;
    line-height: 1.72;
  }

  .section-heading__aside .text-link {
    margin-top: var(--space-6);
  }

  .learning-path {
    margin-top: var(--space-20);
    border-top: 0.0625rem solid var(--line-strong);
  }

  .learning-step {
    display: grid;
    grid-template-columns: 5rem 3rem 1fr;
    align-items: stretch;
    min-height: 12.5rem;
    border-bottom: 0.0625rem solid var(--line);
  }

  .learning-step__index {
    padding-top: var(--space-8);
    color: var(--orange);
    font-family: var(--font-display);
    font-size: 2.35rem;
    font-weight: 800;
    line-height: 1;
  }

  .learning-step__line {
    position: relative;
    display: grid;
    place-items: center;
  }

  .learning-step__line::before {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 0.0625rem;
    content: "";
    background: var(--line);
  }

  .learning-step__line span {
    position: relative;
    z-index: 1;
    width: 0.75rem;
    height: 0.75rem;
    border: 0.18rem solid var(--paper);
    border-radius: 50%;
    background: var(--sky);
    box-shadow: 0 0 0 0.0625rem var(--sky);
  }

  .learning-step__content {
    display: grid;
    grid-template-columns: minmax(9rem, 0.35fr) minmax(12rem, 0.65fr);
    column-gap: var(--space-8);
    align-content: center;
    padding: var(--space-8) 0 var(--space-8) var(--space-12);
  }

  .learning-step__label {
    align-self: start;
    color: var(--sky-dark);
    font-family: var(--font-mono);
    font-size: 0.66rem;
    font-weight: 800;
    letter-spacing: 0.1em;
  }

  .learning-step__content h3 {
    grid-column: 1;
    margin-top: var(--space-5);
    font-size: 1.65rem;
  }

  .learning-step__content p {
    grid-area: 1 / 2 / span 2;
    color: var(--ink-soft);
    line-height: 1.72;
  }

  .learning-step__content code {
    align-self: end;
    margin-top: var(--space-5);
    color: var(--muted);
    font-size: 0.68rem;
  }

  .section--modes {
    color: #fff;
    background: var(--deep);
  }

  .mode-layout {
    display: grid;
    grid-template-columns: minmax(16rem, 0.64fr) minmax(31rem, 1.36fr);
    gap: clamp(var(--space-12), 7vw, var(--space-24));
    align-items: start;
  }

  .mode-copy {
    position: sticky;
    top: 7rem;
  }

  .mode-copy h2 {
    max-width: 11ch;
    margin-top: var(--space-5);
  }

  .mode-copy > p:not(.eyebrow) {
    max-width: 31rem;
    margin-top: var(--space-8);
    color: var(--deep-muted);
    line-height: 1.75;
  }

  .mode-copy .text-link {
    margin-top: var(--space-8);
  }

  .mode-board {
    border: 0.0625rem solid #65728b;
    background: #f7f7f2;
    box-shadow: 0.55rem 0.55rem 0 #293650;
  }

  .mode-board__route {
    padding: var(--space-8);
    color: var(--ink);
    border-bottom: 0.0625rem solid var(--line-strong);
    background:
      linear-gradient(90deg, rgb(2 132 199 / 8%) 1px, transparent 1px),
      #edf0ec;
    background-size: 2rem 2rem;
  }

  .mode-board__route > p {
    font-family: var(--font-mono);
    font-size: 0.66rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .route-flow {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--space-4);
    align-items: center;
    margin-top: var(--space-6);
  }

  .route-flow article {
    min-height: 8.5rem;
    padding: var(--space-5);
    border: 0.0625rem solid var(--line);
    background: #fff;
  }

  .route-flow article:first-child {
    border-color: var(--orange);
  }

  .route-flow > span {
    color: var(--orange);
    font-family: var(--font-mono);
    font-size: 1.4rem;
    font-weight: 800;
  }

  .route-flow small {
    color: var(--sky-dark);
    font-family: var(--font-mono);
    font-size: 0.6rem;
    font-weight: 800;
    letter-spacing: 0.08em;
  }

  .route-flow h3 {
    margin-top: var(--space-3);
    color: var(--ink);
    font-size: 1.35rem;
  }

  .route-flow p {
    margin-top: var(--space-3);
    color: var(--muted);
    font-size: 0.76rem;
    line-height: 1.55;
  }

  .role-list {
    padding: var(--space-4) var(--space-8);
  }

  .role {
    display: grid;
    grid-template-columns: 7rem 1fr;
    gap: var(--space-6);
    padding-block: var(--space-6);
    color: var(--ink);
    border-bottom: 0.0625rem solid var(--line);
  }

  .role:last-child {
    border-bottom: 0;
  }

  .role > span {
    align-self: start;
    padding: 0.3rem var(--space-2);
    color: var(--sky-dark);
    border: 0.0625rem solid #9bcde5;
    border-radius: var(--radius-sm);
    background: var(--sky-soft);
    font-family: var(--font-mono);
    font-size: 0.58rem;
    font-weight: 800;
    line-height: 1.2;
    text-align: center;
  }

  .role h3 {
    font-size: 1.2rem;
  }

  .role p {
    margin-top: var(--space-2);
    color: var(--muted);
    font-size: 0.86rem;
    line-height: 1.6;
  }

  .labs-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    margin-top: var(--space-16);
    border-top: 0.0625rem solid var(--ink);
    border-left: 0.0625rem solid var(--ink);
  }

  .lab-card {
    position: relative;
    min-height: 16rem;
    padding: var(--space-8) var(--space-6);
    border-right: 0.0625rem solid var(--ink);
    border-bottom: 0.0625rem solid var(--ink);
    background: rgb(255 253 247 / 58%);
    transition: color 160ms ease, background-color 160ms ease, transform 160ms ease;
  }

  .lab-card:hover {
    z-index: 2;
    color: #fff;
    background: var(--sky-dark);
    transform: translate(-0.2rem, -0.2rem);
    box-shadow: 0.3rem 0.3rem 0 var(--orange);
  }

  .lab-card__top {
    display: flex;
    gap: var(--space-3);
    align-items: center;
    justify-content: space-between;
  }

  .lab-card__index {
    color: var(--orange);
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
  }

  .lab-card .tag {
    transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease;
  }

  .lab-card:hover .tag {
    color: #fff;
    border-color: rgb(255 255 255 / 42%);
    background: rgb(255 255 255 / 12%);
  }

  .lab-card h3 {
    margin-top: var(--space-8);
    font-size: 1.48rem;
  }

  .lab-card p {
    margin-top: var(--space-4);
    color: var(--muted);
    font-size: 0.86rem;
    line-height: 1.65;
    transition: color 160ms ease;
  }

  .lab-card:hover p {
    color: #ccecff;
  }

  .lab-card--cta {
    display: grid;
    align-content: center;
    color: #fff;
    background: var(--orange);
  }

  .lab-card--cta:hover {
    background: var(--orange-dark);
  }

  .lab-card--cta p {
    color: #fff0e6;
  }

  .lab-card--cta .text-link {
    width: max-content;
    margin-top: var(--space-6);
    color: #fff;
  }

  .architecture-map {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    margin-top: var(--space-16);
    border-block: 0.0625rem solid var(--ink);
  }

  .architecture-node {
    position: relative;
    min-height: 18rem;
    padding: var(--space-10) var(--space-6);
    border-left: 0.0625rem solid var(--line-strong);
    background: rgb(255 255 255 / 34%);
  }

  .architecture-node:last-child {
    border-right: 0.0625rem solid var(--line-strong);
  }

  .architecture-node__port {
    display: flex;
    align-items: center;
    height: 2.1rem;
  }

  .architecture-node__port::before,
  .architecture-node__port::after {
    height: 0.0625rem;
    content: "";
    background: var(--line-strong);
  }

  .architecture-node__port::before {
    width: var(--space-4);
  }

  .architecture-node__port::after {
    flex: 1;
  }

  .architecture-node__port span {
    width: 2.1rem;
    height: 2.1rem;
    border: 0.18rem solid var(--sky);
    background: var(--paper);
  }

  .architecture-node__kind {
    display: block;
    margin-top: var(--space-8);
    color: var(--sky-dark);
    font-family: var(--font-mono);
    font-size: 0.62rem;
    font-weight: 800;
    letter-spacing: 0.1em;
  }

  .architecture-node h3 {
    margin-top: var(--space-3);
    font-size: 1.52rem;
  }

  .architecture-node p {
    margin-top: var(--space-5);
    color: var(--muted);
    font-size: 0.86rem;
    line-height: 1.65;
  }

  .architecture-node__arrow {
    position: absolute;
    z-index: 2;
    top: 3.35rem;
    right: -1rem;
    color: var(--orange);
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 800;
  }

  .architecture-note {
    display: flex;
    gap: var(--space-3);
    align-items: flex-start;
    max-width: 55rem;
    margin-top: var(--space-6);
    color: var(--muted);
    font-size: 0.77rem;
    line-height: 1.65;
  }

  .architecture-note > span {
    display: inline-grid;
    flex: none;
    place-items: center;
    width: 1.25rem;
    height: 1.25rem;
    border: 0.0625rem solid var(--line-strong);
    border-radius: 50%;
    font-family: var(--font-mono);
    font-size: 0.65rem;
  }

  .section--boundaries {
    color: #fff;
    background: var(--warm-dark);
  }

  .boundaries-heading {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(18rem, 0.75fr);
    gap: var(--space-8) var(--space-16);
    align-items: end;
  }

  .boundaries-heading .eyebrow {
    grid-column: 1 / -1;
  }

  .boundaries-heading h2 {
    max-width: 12ch;
  }

  .boundaries-heading > p:last-child {
    color: #d4c3bd;
    line-height: 1.75;
  }

  .boundary-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    margin-top: var(--space-16);
    border-top: 0.0625rem solid var(--warm-line);
    border-left: 0.0625rem solid var(--warm-line);
  }

  .boundary-card {
    min-height: 15rem;
    padding: var(--space-8) var(--space-6);
    border-right: 0.0625rem solid var(--warm-line);
    border-bottom: 0.0625rem solid var(--warm-line);
  }

  .boundary-card > span {
    display: grid;
    place-items: center;
    width: 2.5rem;
    height: 2.5rem;
    color: var(--orange);
    border: 0.0625rem solid var(--orange);
    font-family: var(--font-mono);
    font-size: 1.35rem;
  }

  .boundary-card h3 {
    margin-top: var(--space-8);
    font-size: 1.28rem;
  }

  .boundary-card p {
    margin-top: var(--space-4);
    color: #d4c3bd;
    font-size: 0.84rem;
    line-height: 1.65;
  }

  .section--source {
    padding-block: clamp(var(--space-16), 9vw, 8rem);
  }

  .source-card {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(21rem, 0.8fr);
    overflow: hidden;
    border: 0.0625rem solid var(--ink);
    background: #fff;
    box-shadow: 0.55rem 0.55rem 0 var(--sky-soft);
  }

  .source-card__copy {
    padding: var(--space-12);
  }

  .source-card__copy h2 {
    max-width: 12ch;
    margin-top: var(--space-5);
    font-size: clamp(2.4rem, 4.5vw, 4.2rem);
  }

  .source-card__copy > p:not(.eyebrow) {
    max-width: 42rem;
    margin-top: var(--space-6);
    color: var(--muted);
    line-height: 1.72;
  }

  .source-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    margin-top: var(--space-8);
  }

  .terminal {
    display: grid;
    grid-template-rows: auto 1fr auto;
    color: #f7fbff;
    border-left: 0.0625rem solid var(--ink);
    background: var(--deep);
  }

  .terminal__topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 3rem;
    padding-inline: var(--space-4);
    border-bottom: 0.0625rem solid var(--deep-line);
    font-family: var(--font-mono);
    font-size: 0.63rem;
    letter-spacing: 0.07em;
    text-transform: uppercase;
  }

  .terminal__topbar button {
    padding: 0.38rem 0.58rem;
    color: #c7edff;
    border: 0.0625rem solid #63708a;
    border-radius: var(--radius-sm);
    background: transparent;
    cursor: pointer;
  }

  .terminal__topbar button:hover {
    color: #fff;
    border-color: var(--sky);
  }

  .terminal pre {
    padding: var(--space-8) var(--space-6);
    overflow-x: auto;
    color: #d8e7f5;
    font-size: 0.78rem;
    line-height: 1.85;
  }

  .terminal code .prompt {
    color: #65d4ac;
  }

  .terminal code .command {
    color: #ffb488;
  }

  .source-meta {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border-top: 0.0625rem solid var(--deep-line);
  }

  .source-meta > div {
    padding: var(--space-4);
    border-right: 0.0625rem solid var(--deep-line);
  }

  .source-meta > div:last-child {
    border-right: 0;
  }

  .source-meta dt {
    color: #8fa2bd;
    font-family: var(--font-mono);
    font-size: 0.56rem;
    font-weight: 800;
    letter-spacing: 0.08em;
  }

  .source-meta dd {
    margin-top: var(--space-2);
    color: #fff;
    font-family: var(--font-display);
    font-size: 0.88rem;
    font-weight: 750;
    line-height: 1.3;
  }

  .site-footer {
    padding-block: var(--space-12);
    color: #fff;
    background: var(--ink);
  }

  .not-found {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(24rem, 0.85fr);
    gap: clamp(var(--space-10), 6vw, var(--space-20));
    align-items: center;
    min-height: calc(100svh - 16rem);
    padding-block: clamp(var(--space-16), 9vw, 8rem);
  }

  .not-found__copy h1 {
    max-width: 10ch;
    margin-top: var(--space-6);
    font-size: clamp(3.3rem, 7vw, 6.5rem);
  }

  .not-found__copy > p:not(.eyebrow) {
    max-width: 39rem;
    margin-top: var(--space-6);
    color: var(--muted);
    line-height: 1.72;
  }

  .not-found__copy > p[lang] {
    padding-left: var(--space-4);
    border-left: 0.16rem solid var(--orange);
  }

  .not-found__panel {
    border: 0.0625rem solid var(--ink);
    background: var(--surface);
    box-shadow: var(--shadow-panel);
  }

  .not-found__trace {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-5) var(--space-6);
    align-items: center;
    min-height: 22rem;
    padding: var(--space-8);
    background:
      linear-gradient(rgb(17 24 39 / 5%) 1px, transparent 1px),
      linear-gradient(90deg, rgb(17 24 39 / 5%) 1px, transparent 1px),
      #eef0eb;
    background-size: 2rem 2rem;
  }

  .not-found__trace > span {
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.62rem;
    font-weight: 800;
    letter-spacing: 0.08em;
  }

  .not-found__trace code {
    padding: var(--space-3);
    color: var(--sky-dark);
    border: 0.0625rem solid var(--line);
    background: #fff;
    font-size: 0.76rem;
    overflow-wrap: anywhere;
  }

  .not-found__trace strong {
    color: var(--orange);
    font-family: var(--font-display);
    font-size: 5rem;
    line-height: 1;
  }

  .not-found__trace p {
    grid-column: 1 / -1;
    color: var(--muted);
    font-size: 0.82rem;
  }

  .not-found__panel figcaption {
    padding: var(--space-3) var(--space-4);
    color: var(--muted);
    font-size: 0.72rem;
    text-align: center;
  }

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

  .footer-brand p {
    margin-top: var(--space-4);
    color: var(--deep-muted);
    font-size: 0.82rem;
  }

  .footer-links {
    display: flex;
    grid-column: 2;
    flex-wrap: wrap;
    gap: var(--space-6);
    color: #c9edff;
    font-size: 0.77rem;
  }

  .footer-links a:hover {
    color: #fff;
    text-decoration: underline;
    text-underline-offset: 0.25rem;
  }

  .footer-status {
    display: flex;
    gap: var(--space-2);
    align-items: center;
    color: var(--deep-muted);
    font-size: 0.73rem;
  }

  @keyframes scan {
    0%,
    20% {
      left: -0.25rem;
      opacity: 0;
    }

    30%,
    70% {
      opacity: 1;
    }

    80%,
    100% {
      left: calc(100% + 0.25rem);
      opacity: 0;
    }
  }
}

@layer responsive {
  @media (max-width: 69rem) {
    .hero {
      grid-template-columns: minmax(0, 0.8fr) minmax(28rem, 1.2fr);
      min-height: auto;
    }

    .lab-map__body {
      grid-template-columns: minmax(0, 0.72fr) 3.7rem minmax(0, 1.28fr);
    }

    .command-rail,
    .mode-stack,
    .mode-card {
      padding: var(--space-4);
    }

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

    .architecture-node:nth-child(2) {
      border-right: 0.0625rem solid var(--line-strong);
    }

    .architecture-node:nth-child(-n + 2) {
      border-bottom: 0.0625rem solid var(--line);
    }

    .architecture-node:nth-child(2) .architecture-node__arrow {
      right: 50%;
      bottom: -1.05rem;
      top: auto;
      transform: rotate(90deg);
    }
  }

  @media (max-width: 57rem) {
    .primary-nav {
      gap: var(--space-5);
    }

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

    .hero-copy {
      max-width: 44rem;
    }

    .lab-map {
      width: min(100%, 44rem);
      justify-self: end;
    }

    .section-heading--split,
    .mode-layout,
    .boundaries-heading {
      grid-template-columns: 1fr;
      gap: var(--space-8);
    }

    .mode-copy {
      position: static;
    }

    .learning-step__content {
      grid-template-columns: minmax(10rem, 0.4fr) minmax(0, 0.6fr);
    }

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

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

    .boundary-card {
      min-height: 13rem;
    }

    .source-card {
      grid-template-columns: 1fr;
    }

    .not-found {
      grid-template-columns: 1fr;
    }

    .terminal {
      min-height: 27rem;
      border-top: 0.0625rem solid var(--ink);
      border-left: 0;
    }
  }

  @media (max-width: 45rem) {
    .page-shell,
    .header-inner {
      width: min(calc(100% - 2rem), 40rem);
    }

    h1 {
      font-size: clamp(3.2rem, 15vw, 5rem);
    }

    h2 {
      font-size: clamp(2.3rem, 11vw, 3.5rem);
    }

    .header-inner {
      grid-template-columns: 1fr auto;
    }

    .header-inner--simple .github-link {
      display: none;
    }

    .primary-nav,
    .github-link {
      display: none;
    }

    .mobile-menu {
      position: relative;
      display: block;
    }

    .mobile-menu summary {
      padding: 0.45rem 0.62rem;
      border: 0.0625rem solid var(--line-strong);
      border-radius: var(--radius-sm);
      font-family: var(--font-mono);
      font-size: 0.67rem;
      font-weight: 800;
      cursor: pointer;
      list-style: none;
    }

    .mobile-menu summary::-webkit-details-marker {
      display: none;
    }

    .mobile-menu nav {
      position: absolute;
      top: calc(100% + 0.65rem);
      right: 0;
      display: grid;
      width: 13rem;
      padding: var(--space-3);
      border: 0.0625rem solid var(--ink);
      background: var(--surface);
      box-shadow: 0.3rem 0.3rem 0 rgb(17 24 39 / 15%);
    }

    .mobile-menu nav a {
      padding: var(--space-3);
      border-bottom: 0.0625rem solid var(--line);
      font-size: 0.83rem;
      font-weight: 700;
    }

    .mobile-menu nav a:last-child {
      border-bottom: 0;
    }

    .hero {
      padding-block: var(--space-12) var(--space-20);
    }

    .hero-body {
      margin-top: var(--space-6);
      font-size: 1rem;
    }

    .hero-actions {
      flex-direction: column;
      align-items: stretch;
    }

    .button {
      width: 100%;
    }

    .button--secondary {
      justify-content: flex-start;
      border-bottom: 0;
    }

    .lab-map__topbar {
      grid-template-columns: auto 1fr;
    }

    .lab-map__topbar > span:nth-child(2) {
      display: none;
    }

    .lab-map__body {
      grid-template-columns: 1fr;
      min-height: auto;
    }

    .command-rail {
      min-height: 14rem;
    }

    .mode-boundary {
      grid-template-rows: 1fr;
      grid-template-columns: auto 1fr auto;
      min-height: 3.5rem;
      padding: var(--space-2) var(--space-4);
      border-block: 0.0625rem solid var(--ink);
      border-inline: 0;
    }

    .mode-boundary span {
      writing-mode: horizontal-tb;
    }

    .mode-boundary i {
      width: calc(100% - 2rem);
      height: 0.12rem;
      margin: 0 var(--space-4);
    }

    .mode-boundary i::before,
    .mode-boundary i::after {
      top: 50%;
      transform: translateY(-50%) rotate(45deg);
    }

    .mode-boundary i::before {
      right: auto;
      left: 0;
    }

    .mode-boundary i::after {
      right: 0;
      bottom: auto;
      left: auto;
    }

    .lab-map__ports {
      grid-template-columns: 1fr 1fr;
      padding-block: var(--space-3);
    }

    .lab-map__ports > span {
      grid-column: 1 / -1;
      padding: 0 0 var(--space-2);
      text-align: center;
    }

    .lab-map__ports code {
      border-top: 0.0625rem solid var(--line);
      border-left: 0;
    }

    .lab-map__ports code:last-child {
      grid-column: 1 / -1;
    }

    .fact-strip__inner {
      grid-template-columns: 1fr;
    }

    .fact,
    .fact:last-child {
      min-height: auto;
      padding: var(--space-5) 0;
      border-right: 0;
      border-bottom: 0.0625rem solid var(--deep-line);
      border-left: 0;
    }

    .fact:last-child {
      border-bottom: 0;
    }

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

    .learning-path {
      margin-top: var(--space-12);
    }

    .learning-step {
      grid-template-columns: 3rem 1.5rem 1fr;
    }

    .learning-step__index {
      font-size: 1.5rem;
    }

    .learning-step__content {
      grid-template-columns: 1fr;
      padding: var(--space-6) 0 var(--space-6) var(--space-4);
    }

    .learning-step__content h3,
    .learning-step__content p,
    .learning-step__content code {
      grid-area: auto / 1;
    }

    .learning-step__content h3 {
      margin-top: var(--space-3);
    }

    .learning-step__content p {
      margin-top: var(--space-4);
    }

    .mode-board__route,
    .role-list {
      padding: var(--space-5);
    }

    .route-flow {
      grid-template-columns: 1fr;
    }

    .route-flow > span {
      justify-self: center;
      transform: rotate(90deg);
    }

    .role {
      grid-template-columns: 1fr;
      gap: var(--space-3);
    }

    .role > span {
      width: max-content;
    }

    .labs-grid,
    .architecture-map,
    .boundary-grid {
      grid-template-columns: 1fr;
    }

    .lab-card,
    .boundary-card {
      min-height: auto;
    }

    .architecture-node {
      min-height: auto;
      border-right: 0.0625rem solid var(--line-strong);
      border-bottom: 0.0625rem solid var(--line);
    }

    .architecture-node:last-child {
      border-bottom: 0;
    }

    .architecture-node__arrow,
    .architecture-node:nth-child(2) .architecture-node__arrow {
      top: auto;
      right: 50%;
      bottom: -1.08rem;
      transform: rotate(90deg);
    }

    .source-card__copy {
      padding: var(--space-8) var(--space-5);
    }

    .terminal pre {
      padding: var(--space-6) var(--space-4);
      font-size: 0.67rem;
    }

    .source-meta {
      grid-template-columns: 1fr;
    }

    .source-meta > div {
      border-right: 0;
      border-bottom: 0.0625rem solid var(--deep-line);
    }

    .source-meta > div:last-child {
      border-bottom: 0;
    }

    .footer-inner {
      grid-template-columns: 1fr;
      align-items: start;
    }

    .not-found__copy h1 {
      font-size: clamp(3rem, 15vw, 4.7rem);
    }

    .not-found__trace {
      grid-template-columns: 1fr;
      min-height: 18rem;
      padding: var(--space-5);
    }

    .not-found__trace p {
      grid-column: 1;
    }

    .footer-links {
      grid-column: 1;
    }
  }

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

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