:root {
  --ink: #151511;
  --ink-soft: #4f514b;
  --paper: #f2efe5;
  --paper-raised: #fffdf5;
  --line: #c5c1b5;
  --line-strong: #8f8e85;
  --orange: #b6420d;
  --orange-contrast: #fffaf0;
  --teal: #006c6d;
  --teal-soft: #c9e4de;
  --focus: #005fcc;
  --max-width: 78rem;
  --gutter: clamp(1.25rem, 4vw, 3.5rem);
  --section-space: clamp(5.5rem, 10vw, 9.5rem);
  --font-sans:
    "Inter", ui-sans-serif, -apple-system, "BlinkMacSystemFont", "Segoe UI",
    "Noto Sans SC", "Microsoft YaHei", "Arial", sans-serif;
  --font-mono:
    "SFMono-Regular", "Consolas", "Liberation Mono", "Noto Sans Mono CJK SC",
    monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f3efe3;
    --ink-soft: #b7b5ad;
    --paper: #121210;
    --paper-raised: #1a1a17;
    --line: #3b3c37;
    --line-strong: #76776f;
    --orange: #f1782f;
    --orange-contrast: #14110d;
    --teal: #47b7ad;
    --teal-soft: #173b38;
    --focus: #80b7ff;
  }
}

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

html {
  color-scheme: light dark;
  scroll-behavior: smooth;
}

body {
  min-width: 20rem;
  margin: 0;
  color: var(--ink);
  background-color: var(--paper);
  font-family: var(--font-sans);
  line-height: 1.6;
  text-rendering: optimizelegibility;
}

body::before {
  position: fixed;
  z-index: -1;
  inset: 0;
  background-image:
    linear-gradient(
      to right,
      color-mix(in srgb, var(--line) 34%, transparent) 1px,
      transparent 1px
    ),
    linear-gradient(
      to bottom,
      color-mix(in srgb, var(--line) 26%, transparent) 1px,
      transparent 1px
    );
  background-size: 4rem 4rem;
  content: "";
  mask-image: linear-gradient(to bottom, rgb(0 0 0 / 42%), transparent 40rem);
  pointer-events: none;
}

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

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-color: var(--orange);
}

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

::selection {
  color: var(--orange-contrast);
  background: var(--orange);
}

[hidden] {
  display: none !important;
}

.shell {
  width: min(100% - (2 * var(--gutter)), var(--max-width));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.75rem 1rem;
  color: var(--orange-contrast);
  background: var(--orange);
  font-weight: 800;
  transform: translateY(-160%);
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(0.75rem);
}

.header-layout {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  min-height: 5rem;
  gap: clamp(1rem, 4vw, 3rem);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  gap: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.wordmark-mark {
  position: relative;
  width: 1rem;
  height: 1rem;
  border: 0.14rem solid var(--ink);
}

.wordmark-mark::after {
  position: absolute;
  right: -0.35rem;
  bottom: -0.35rem;
  width: 0.55rem;
  height: 0.55rem;
  background: var(--orange);
  content: "";
}

.primary-nav {
  display: flex;
  gap: clamp(1rem, 3vw, 2.25rem);
}

.primary-nav a,
.language-switch a {
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.primary-nav a {
  position: relative;
}

.primary-nav a::after {
  position: absolute;
  right: 0;
  bottom: -0.45rem;
  left: 0;
  height: 0.12rem;
  background: var(--orange);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 160ms ease;
}

.primary-nav a:hover::after,
.primary-nav a:focus-visible::after {
  transform: scaleX(1);
}

.language-switch {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
}

.language-switch a {
  color: var(--ink-soft);
}

.language-switch a[aria-current="page"] {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--orange);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(19rem, 0.88fr);
  min-height: min(48rem, calc(100svh - 5rem));
  padding-block: clamp(4.5rem, 8vw, 7.5rem);
  gap: clamp(3rem, 7vw, 7.5rem);
}

.hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
}

.eyebrow,
.section-number,
.project-kind,
.project-index,
.card-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

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

.hero h1 {
  max-width: none;
  margin: 1.25rem 0 1.75rem;
  font-size: clamp(2.8rem, 6vw, 5.8rem);
  font-weight: 850;
  letter-spacing: -0.07em;
  line-height: 0.96;
}

.hero h1 [lang="en"] {
  font-size: 0.82em;
  letter-spacing: -0.055em;
}

.hero-intro {
  max-width: 39rem;
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 2vw, 1.28rem);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  margin-top: 2.25rem;
  gap: 0.75rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  min-width: 10rem;
  min-height: 3.25rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--ink);
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
  text-transform: uppercase;
  transition:
    color 150ms ease,
    background-color 150ms ease,
    transform 150ms ease;
}

.button:hover {
  transform: translateY(-0.16rem);
}

.button-primary {
  color: var(--orange-contrast);
  border-color: var(--orange);
  background: var(--orange);
}

.button-secondary {
  background: var(--paper-raised);
}

.hero-system {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.system-grid {
  position: relative;
  min-height: 18rem;
  border: 1px solid var(--line);
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 25% 25%;
  overflow: hidden;
}

.system-node {
  position: absolute;
  display: block;
  width: 2.75rem;
  height: 2.75rem;
  border: 2px solid currentcolor;
  background: var(--paper-raised);
}

.node-input {
  top: 19%;
  left: 9%;
  color: var(--orange);
}

.node-migrate {
  top: 56%;
  left: 31%;
  color: var(--ink);
  transform: rotate(45deg);
}

.node-test {
  top: 25%;
  right: 25%;
  color: var(--teal);
  border-radius: 50%;
}

.node-release {
  right: 9%;
  bottom: 15%;
  color: var(--teal);
}

.system-path {
  position: absolute;
  display: block;
  height: 0.15rem;
  background: var(--line-strong);
  transform-origin: left;
}

.path-one {
  top: 36%;
  left: 17%;
  width: 47%;
  transform: rotate(10deg);
}

.path-two {
  right: 17%;
  bottom: 32%;
  width: 35%;
  background: var(--teal);
  transform: rotate(18deg);
}

.system-check {
  position: absolute;
  right: 27%;
  bottom: 22%;
  display: grid;
  width: 3.5rem;
  height: 3.5rem;
  color: var(--orange-contrast);
  border-radius: 50%;
  background: var(--teal);
  font-size: 1.75rem;
  font-weight: 900;
  place-items: center;
}

.proof-list {
  padding: 0;
  margin: 1.25rem 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.proof-list li {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
  gap: 0.75rem;
}

.proof-index {
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.proof-list strong {
  display: block;
  font-size: 0.94rem;
}

.proof-list p {
  margin: 0.22rem 0 0;
  color: var(--ink-soft);
  font-size: 0.84rem;
}

.section {
  padding-block: var(--section-space);
  scroll-margin-top: 2rem;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(5rem, 0.3fr) minmax(0, 1.7fr);
  padding-bottom: clamp(2.75rem, 6vw, 5.5rem);
  border-top: 1px solid var(--line-strong);
  gap: 2rem;
}

.section-heading > * {
  padding-top: 1.25rem;
}

.section-number {
  color: var(--ink-soft);
}

.section h2 {
  max-width: none;
  margin: 0.75rem 0 0;
  font-size: clamp(2.25rem, 5vw, 5rem);
  letter-spacing: -0.055em;
  line-height: 1;
}

.section-intro {
  max-width: 46rem;
  margin: 1.5rem 0 0;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-block: 1px solid var(--line);
}

.capability-card {
  min-height: 21rem;
  padding: clamp(1.5rem, 4vw, 2.75rem);
  border-right: 1px solid var(--line);
}

.capability-card:last-child {
  border-right: 0;
}

.card-index {
  color: var(--orange);
}

.capability-card h3 {
  max-width: none;
  margin: clamp(4rem, 8vw, 7rem) 0 1.25rem;
  font-size: clamp(1.35rem, 2.5vw, 2rem);
  letter-spacing: -0.035em;
  line-height: 1.15;
}

.capability-card p:last-child {
  max-width: 27rem;
  margin: 0;
  color: var(--ink-soft);
}

.projects-section {
  border-block: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper-raised) 75%, transparent);
}

.project-list {
  padding: 0;
  margin: 0;
  list-style: none;
}

.project-list > li {
  border-top: 1px solid var(--line);
}

.project-list > li:last-child {
  border-bottom: 1px solid var(--line);
}

.project-card {
  display: grid;
  grid-template-columns: minmax(9rem, 0.36fr) minmax(0, 1.24fr) minmax(
      10rem,
      0.4fr
    );
  padding-block: clamp(2rem, 4vw, 3.5rem);
  gap: clamp(1.5rem, 4vw, 4rem);
}

.project-meta {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 2rem;
}

.project-index {
  color: var(--ink-soft);
  font-size: 1rem;
}

.status {
  display: flex;
  align-items: flex-start;
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  line-height: 1.5;
  text-transform: uppercase;
}

.status > span[aria-hidden="true"] {
  flex: 0 0 auto;
  width: 0.55rem;
  height: 0.55rem;
  margin: 0.22rem 0.5rem 0 0;
  border-radius: 50%;
  background: var(--teal);
}

.status-migration > span[aria-hidden="true"] {
  border: 1px solid var(--orange);
  background: transparent;
}

.project-kind {
  color: var(--orange);
}

.project-body h3 {
  margin: 0.8rem 0 1.2rem;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4vw, 3.6rem);
  letter-spacing: -0.06em;
  line-height: 1;
  overflow-wrap: anywhere;
}

.project-description {
  max-width: 46rem;
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.02rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  padding: 0;
  margin: 1.5rem 0 0;
  gap: 0.45rem;
  list-style: none;
}

.tag-list li {
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.67rem;
  text-transform: uppercase;
}

.project-links {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-end;
  gap: 0.75rem;
}

.project-links a {
  display: flex;
  justify-content: space-between;
  width: 100%;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 800;
  text-decoration: none;
  text-transform: uppercase;
}

.project-links a:hover {
  color: var(--orange);
  border-color: var(--orange);
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
}

.principle-grid article {
  min-height: 17rem;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  background: var(--paper-raised);
}

.principle-mark {
  margin: 0;
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 2rem;
}

.principle-grid h3 {
  margin: 3.5rem 0 0.9rem;
  font-size: 1.25rem;
}

.principle-grid article > p:last-child {
  margin: 0;
  color: var(--ink-soft);
}

.privacy-note {
  display: grid;
  grid-template-columns: minmax(9rem, 0.6fr) minmax(0, 1.4fr);
  padding: 2rem;
  margin-top: 1px;
  color: var(--orange-contrast);
  background: var(--teal);
  gap: 2rem;
}

.privacy-note .eyebrow {
  color: inherit;
}

.privacy-note > p:last-child {
  max-width: 48rem;
  margin: 0;
  font-size: clamp(1.15rem, 2.5vw, 1.75rem);
  font-weight: 700;
  line-height: 1.35;
}

.site-footer {
  padding-block: 3rem;
  color: var(--orange-contrast);
  background: var(--ink);
}

.footer-layout {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
}

.footer-layout p {
  margin: 0.3rem 0 0;
  color: color-mix(in srgb, var(--orange-contrast) 72%, transparent);
  font-size: 0.82rem;
}

.footer-layout .footer-wordmark {
  color: var(--orange-contrast);
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 800;
}

.footer-layout a {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
}

.noscript-note {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  left: 1rem;
  z-index: 10;
  padding: 0.8rem 1rem;
  margin: 0;
  color: var(--orange-contrast);
  background: var(--orange);
  font-size: 0.82rem;
  text-align: center;
}

.error-page {
  display: flex;
  flex-direction: column;
  min-height: 100svh;
}

.error-page .header-layout {
  grid-template-columns: 1fr auto;
}

.error-main {
  display: flex;
  flex: 1;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding-block: 4rem;
}

.error-code {
  margin: 0;
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: clamp(7rem, 24vw, 20rem);
  font-weight: 900;
  letter-spacing: -0.1em;
  line-height: 0.75;
}

.error-main h1 {
  margin: 1rem 0;
  font-size: clamp(2.5rem, 6vw, 5.5rem);
  letter-spacing: -0.06em;
  line-height: 1;
}

.error-main > p:not(.error-code, .eyebrow) {
  max-width: 43rem;
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

@media (max-width: 62rem) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero-system {
    display: grid;
    grid-template-columns: minmax(16rem, 0.8fr) minmax(18rem, 1.2fr);
    gap: 1.5rem;
  }

  .proof-list {
    margin-top: 0;
  }

  .capability-grid,
  .principle-grid {
    grid-template-columns: 1fr;
  }

  .capability-card {
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .capability-card:last-child {
    border-bottom: 0;
  }

  .capability-card h3 {
    margin-top: 3rem;
  }

  .project-card {
    grid-template-columns: minmax(8rem, 0.3fr) minmax(0, 1.2fr);
  }

  .project-links {
    grid-column: 2;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .project-links a {
    width: auto;
    min-width: 9rem;
    gap: 1.5rem;
  }
}

@media (max-width: 46rem) {
  :root {
    --gutter: 1rem;
  }

  .header-layout {
    grid-template-columns: 1fr auto;
    min-height: 4.5rem;
  }

  .primary-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-content: space-between;
    width: 100%;
    padding: 0.75rem 0;
    border-top: 1px solid var(--line);
  }

  .hero {
    min-height: auto;
    padding-top: 4rem;
  }

  .hero h1 {
    font-size: clamp(2.55rem, 13vw, 4.5rem);
  }

  .hero-system {
    display: flex;
  }

  .system-grid {
    min-height: 15rem;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .section-heading > div {
    padding-top: 2rem;
  }

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

  .project-meta {
    flex-direction: row;
    align-items: flex-start;
  }

  .project-links {
    grid-column: auto;
  }

  .privacy-note {
    grid-template-columns: 1fr;
  }

  .footer-layout {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (forced-colors: active) {
  .wordmark-mark::after,
  .status > span[aria-hidden="true"],
  .system-check {
    forced-color-adjust: none;
  }

  .button,
  .project-links a,
  .tag-list li {
    border: 1px solid ButtonText;
  }

  .button-primary {
    color: HighlightText;
    background: Highlight;
  }
}

@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;
  }
}

@media print {
  :root {
    --ink: #000;
    --ink-soft: #222;
    --paper: #fff;
    --paper-raised: #fff;
    --line: #777;
    --line-strong: #333;
  }

  body::before,
  .site-header,
  .hero-system .system-grid,
  .hero-actions,
  .site-footer {
    display: none;
  }

  .hero {
    display: block;
    min-height: 0;
    padding-block: 2rem;
  }

  .section {
    padding-block: 2.5rem;
  }

  .project-card {
    break-inside: avoid;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-family: var(--font-mono);
    font-size: 0.7em;
    font-weight: 400;
    overflow-wrap: anywhere;
  }
}