:root {
  color-scheme: light dark;
  --bg: #eef1e9;
  --bg-soft: #e4eadf;
  --surface: #f8f9f4;
  --surface-raised: #ffffff;
  --text: #17221c;
  --text-soft: #526158;
  --text-faint: #77827b;
  --accent: #27634d;
  --accent-strong: #174837;
  --accent-soft: #d5e5da;
  --line: #cbd3ca;
  --line-strong: #9daa9f;
  --code: #13231b;
  --code-text: #dce9df;
  --shadow: 0 18px 54px rgb(30 59 43 / 0.11);
  --radius-card: 18px;
  --radius-control: 10px;
  --content: 1440px;
  --font-sans: "Avenir Next", "SF Pro Display", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  --font-mono: "SFMono-Regular", "Cascadia Code", "Roboto Mono", monospace;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111813;
  --bg-soft: #18231c;
  --surface: #19231d;
  --surface-raised: #202d25;
  --text: #e6ede8;
  --text-soft: #aebbb2;
  --text-faint: #829087;
  --accent: #78b394;
  --accent-strong: #9ec8ae;
  --accent-soft: #233d2f;
  --line: #34443a;
  --line-strong: #52675a;
  --code: #0c120e;
  --code-text: #dce9df;
  --shadow: 0 20px 64px rgb(0 0 0 / 0.28);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #111813;
    --bg-soft: #18231c;
    --surface: #19231d;
    --surface-raised: #202d25;
    --text: #e6ede8;
    --text-soft: #aebbb2;
    --text-faint: #829087;
    --accent: #78b394;
    --accent-strong: #9ec8ae;
    --accent-soft: #233d2f;
    --line: #34443a;
    --line-strong: #52675a;
    --code: #0c120e;
    --code-text: #dce9df;
    --shadow: 0 20px 64px rgb(0 0 0 / 0.28);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 78% 4%, color-mix(in srgb, var(--accent-soft) 72%, transparent), transparent 32rem),
    var(--bg);
  font-family: var(--font-sans);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 68%, transparent);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 30;
  padding: 0.7rem 1rem;
  border-radius: var(--radius-control);
  color: var(--surface);
  background: var(--accent-strong);
  transform: translateY(-180%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 74%, transparent);
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(18px) saturate(130%);
}

.site-header__inner {
  width: min(calc(100% - 2.5rem), var(--content));
  min-height: 68px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 2rem;
  align-items: center;
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  gap: 0.75rem;
  align-items: center;
  color: var(--text);
  text-decoration: none;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 9px;
}

.brand strong {
  display: block;
  font-size: 1rem;
  letter-spacing: 0.08em;
}

.brand small {
  display: block;
  color: var(--text-faint);
  font-size: 0.7rem;
  line-height: 1.2;
}

.site-nav {
  display: flex;
  gap: 0.2rem;
  justify-content: center;
}

.site-nav a {
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  color: var(--text-soft);
  font-size: 0.86rem;
  font-weight: 600;
  text-decoration: none;
  transition: color 180ms ease, background 180ms ease;
}

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

.header-actions {
  display: flex;
  gap: 0.5rem;
}

.icon-button,
.menu-button {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  color: var(--text);
  background: var(--surface);
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.icon-button:hover,
.menu-button:hover {
  border-color: var(--line-strong);
  background: var(--surface-raised);
}

.icon-button:active,
.menu-button:active,
.button:active {
  transform: translateY(1px);
}

.menu-button {
  display: none;
}

.container {
  width: min(calc(100% - 2.5rem), var(--content));
  margin: 0 auto;
}

.hero {
  min-height: min(720px, calc(100dvh - 68px));
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(34rem, 1.18fr);
  gap: clamp(2.5rem, 6vw, 7rem);
  align-items: center;
  padding: clamp(4rem, 9vh, 6.5rem) 0;
}

.hero-copy {
  max-width: 36rem;
}

.hero-kicker,
.section-label {
  margin: 0 0 1rem;
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 9ch;
  margin: 0;
  font-size: clamp(3.2rem, 6vw, 5.2rem);
  font-weight: 650;
  letter-spacing: -0.065em;
  line-height: 0.9;
  text-wrap: balance;
}

.hero-copy > p:not(.hero-kicker) {
  max-width: 34rem;
  margin: 1.75rem 0 0;
  color: var(--text-soft);
  font-size: clamp(1rem, 1.4vw, 1.18rem);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.button {
  min-height: 44px;
  display: inline-flex;
  gap: 0.55rem;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-control);
  color: var(--text);
  background: var(--surface);
  font-size: 0.88rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.button--primary {
  border-color: var(--accent-strong);
  color: #f4f8f5;
  background: var(--accent-strong);
}

.button:hover {
  border-color: var(--accent);
  background: var(--surface-raised);
}

.button--primary:hover {
  color: #f4f8f5;
  background: color-mix(in srgb, var(--accent-strong) 90%, #000);
}

.prototype-window {
  position: relative;
  overflow: hidden;
  min-height: 31rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.prototype-window__bar {
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
  border-bottom: 1px solid var(--line);
  color: var(--text-faint);
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

.prototype-window img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  object-position: top left;
}

.prototype-window__viewport {
  height: 31rem;
  overflow: hidden;
}

.prototype-window__link {
  position: absolute;
  inset: 46px 0 0;
  z-index: 2;
}

.stat-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.stat {
  padding: 1.6rem 1.25rem;
}

.stat + .stat {
  border-left: 1px solid var(--line);
}

.stat strong {
  display: block;
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 2vw, 2rem);
}

.stat span {
  color: var(--text-faint);
  font-size: 0.78rem;
}

.section {
  padding: clamp(5rem, 9vw, 8rem) 0;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section-heading {
  max-width: 48rem;
  margin-bottom: 2.5rem;
}

.section-heading h2,
.catalog-hero h1 {
  margin: 0;
  font-size: clamp(2.2rem, 4vw, 4rem);
  letter-spacing: -0.045em;
  line-height: 1;
  text-wrap: balance;
}

.section-heading p,
.catalog-hero p {
  max-width: 62ch;
  margin: 1rem 0 0;
  color: var(--text-soft);
}

.prototype-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 1rem;
}

.artifact-card {
  position: relative;
  min-height: 18rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  color: var(--text);
  background: var(--surface);
  text-decoration: none;
  transition: transform 220ms cubic-bezier(0.16, 1, 0.3, 1), border-color 220ms ease, box-shadow 220ms ease;
}

.artifact-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.artifact-card--feature {
  min-height: 34rem;
  background:
    linear-gradient(to top, var(--surface) 0 28%, transparent 58%),
    url("/moss/assets/prototype-v4.png") center top / cover no-repeat,
    var(--surface);
}

.artifact-card--tint {
  background:
    radial-gradient(circle at 75% 18%, var(--accent-soft), transparent 14rem),
    var(--surface);
}

.artifact-card__meta {
  margin-bottom: 0.5rem;
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.artifact-card h3 {
  max-width: 18ch;
  margin: 0;
  font-size: clamp(1.4rem, 2.4vw, 2.2rem);
  letter-spacing: -0.03em;
  line-height: 1.08;
}

.artifact-card p {
  max-width: 48ch;
  margin: 0.75rem 0 0;
  color: var(--text-soft);
  font-size: 0.88rem;
}

.artifact-card--feature .artifact-card__content {
  padding-top: 6rem;
}

.prototype-stack {
  display: grid;
  gap: 1rem;
}

.diagram-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 1rem;
}

.diagram-card {
  min-height: 26rem;
}

.diagram-card__drawing {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  align-items: center;
  margin: auto 0 2.5rem;
}

.diagram-card__drawing span {
  min-height: 5rem;
  display: grid;
  place-items: center;
  padding: 0.75rem;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  color: var(--accent-strong);
  background: var(--bg-soft);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-align: center;
}

.diagram-card__drawing span:nth-child(2) {
  transform: translateY(-1.5rem);
}

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

.collection {
  min-height: 15rem;
  padding: 1.6rem;
  border-radius: var(--radius-card);
  background: var(--surface);
}

.collection:nth-child(2),
.collection:nth-child(3) {
  background: var(--accent-soft);
}

.collection h3 {
  margin: 0;
  font-size: 1.35rem;
  letter-spacing: -0.025em;
}

.collection p {
  color: var(--text-soft);
}

.collection a {
  display: inline-flex;
  margin-top: 1.25rem;
  color: var(--accent-strong);
  font-weight: 700;
  text-underline-offset: 0.25rem;
}

.search-panel {
  padding: clamp(1.5rem, 4vw, 3rem);
  border-radius: var(--radius-card);
  background: var(--surface);
}

.search-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.75rem;
  align-items: end;
  max-width: 58rem;
}

.search-field {
  display: grid;
  gap: 0.45rem;
}

.search-field label {
  color: var(--text-soft);
  font-size: 0.78rem;
  font-weight: 700;
}

.search-form input {
  min-width: 0;
  min-height: 48px;
  padding: 0 1rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-control);
  color: var(--text);
  background: var(--surface-raised);
}

.search-form input::placeholder {
  color: var(--text-faint);
}

.search-results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.search-results:empty {
  display: none;
}

.search-result {
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}

.search-result span {
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
}

.search-result strong {
  display: block;
  margin-top: 0.25rem;
}

.search-result small {
  display: block;
  margin-top: 0.35rem;
  color: var(--text-soft);
  line-height: 1.5;
}

.search-empty {
  grid-column: 1 / -1;
  color: var(--text-soft);
}

.search-loading {
  grid-column: 1 / -1;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 0.74rem;
}

.catalog-hero {
  max-width: 58rem;
  padding: clamp(4.5rem, 9vw, 8rem) 0 3rem;
}

.catalog-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  padding-bottom: 7rem;
}

.catalog-item {
  min-height: 13rem;
  display: flex;
  flex-direction: column;
  padding: 1.4rem;
  border-top: 1px solid var(--line-strong);
  color: var(--text);
  text-decoration: none;
  transition: background 180ms ease;
}

.catalog-item:hover {
  background: color-mix(in srgb, var(--surface) 72%, transparent);
}

.catalog-item__type {
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
}

.catalog-item h2,
.catalog-item h3 {
  margin: 1rem 0 0;
  font-size: 1.5rem;
  letter-spacing: -0.025em;
}

.catalog-item p {
  margin: 0.65rem 0 0;
  color: var(--text-soft);
  font-size: 0.9rem;
}

.catalog-item__source {
  margin-top: auto;
  padding-top: 1.5rem;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 0.66rem;
}

.document-layout {
  width: min(calc(100% - 2.5rem), var(--content));
  display: grid;
  grid-template-columns: 16rem minmax(0, 1fr) 14rem;
  gap: clamp(2rem, 4vw, 4.5rem);
  align-items: start;
  margin: 0 auto;
  padding: 3rem 0 7rem;
}

.doc-sidebar,
.doc-toc {
  position: sticky;
  top: 96px;
  max-height: calc(100dvh - 120px);
  overflow: auto;
}

.doc-sidebar h2,
.doc-toc h2 {
  margin: 0 0 0.8rem;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.doc-sidebar nav,
.doc-toc nav {
  display: grid;
  gap: 0.15rem;
}

.doc-sidebar a,
.doc-toc a {
  padding: 0.4rem 0.55rem;
  border-radius: 7px;
  color: var(--text-soft);
  font-size: 0.78rem;
  line-height: 1.35;
  text-decoration: none;
}

.doc-sidebar a:hover,
.doc-sidebar a[aria-current="page"],
.doc-toc a:hover {
  color: var(--accent-strong);
  background: var(--accent-soft);
}

.doc-source {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  overflow-wrap: anywhere;
}

.doc-article {
  min-width: 0;
  max-width: 56rem;
}

.doc-article__header {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--line);
}

.doc-article__header p {
  margin: 0 0 0.75rem;
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
}

.doc-article__header h1 {
  margin: 0;
  font-size: clamp(2.4rem, 5vw, 4.8rem);
  letter-spacing: -0.055em;
  line-height: 0.98;
  text-wrap: balance;
}

.doc-content {
  color: var(--text-soft);
  font-size: 1rem;
}

.doc-content h1 {
  display: none;
}

.doc-content h2,
.doc-content h3,
.doc-content h4 {
  color: var(--text);
  line-height: 1.2;
  scroll-margin-top: 100px;
}

.doc-content h2 {
  margin: 3.75rem 0 1rem;
  font-size: 1.9rem;
  letter-spacing: -0.035em;
}

.doc-content h3 {
  margin: 2.5rem 0 0.8rem;
  font-size: 1.3rem;
}

.doc-content p,
.doc-content li {
  max-width: 72ch;
}

.doc-content a {
  color: var(--accent-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2rem;
}

.doc-content blockquote {
  margin: 2rem 0;
  padding: 0.25rem 0 0.25rem 1.25rem;
  border-left: 3px solid var(--accent);
  color: var(--text);
  font-size: 1.05rem;
}

.doc-content table {
  width: 100%;
  margin: 1.75rem 0;
  border-collapse: collapse;
  font-size: 0.86rem;
}

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

.doc-content th {
  color: var(--text);
  background: var(--bg-soft);
}

.doc-content pre {
  max-width: 100%;
  overflow: auto;
  margin: 1.5rem 0;
  padding: 1.15rem;
  border-radius: 12px;
  color: var(--code-text);
  background: var(--code);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.6;
}

.doc-content :not(pre) > code {
  padding: 0.12rem 0.3rem;
  border-radius: 5px;
  color: var(--accent-strong);
  background: var(--accent-soft);
  font-family: var(--font-mono);
  font-size: 0.84em;
}

.diagram-frame {
  overflow: auto;
  margin: 2rem 0;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--surface-raised);
}

.diagram-frame .mermaid {
  min-width: 42rem;
  color: var(--text);
  background: transparent;
}

.site-footer {
  border-top: 1px solid var(--line);
}

.site-footer__inner {
  width: min(calc(100% - 2.5rem), var(--content));
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  margin: 0 auto;
  padding: 2rem 0;
  color: var(--text-faint);
  font-size: 0.75rem;
}

.site-footer a {
  color: var(--accent-strong);
}

@media (max-width: 1120px) {
  .hero {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .document-layout {
    grid-template-columns: 14rem minmax(0, 1fr);
  }

  .doc-toc {
    display: none;
  }
}

@media (max-width: 820px) {
  .site-header__inner {
    grid-template-columns: 1fr auto;
  }

  .site-nav {
    position: absolute;
    top: 68px;
    right: 1.25rem;
    left: 1.25rem;
    display: none;
    padding: 0.75rem;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--surface-raised);
    box-shadow: var(--shadow);
  }

  .site-nav[data-open="true"] {
    display: grid;
  }

  .site-nav a {
    padding: 0.75rem;
  }

  .menu-button {
    display: grid;
    width: auto;
    padding: 0 0.75rem;
  }

  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    padding: 4.5rem 0;
  }

  .hero-copy {
    max-width: 42rem;
  }

  .hero h1 {
    max-width: 11ch;
    font-size: clamp(3.25rem, 14vw, 5.4rem);
  }

  .prototype-window {
    min-height: 26rem;
  }

  .prototype-window__viewport {
    height: 26rem;
  }

  .prototype-grid,
  .diagram-grid,
  .catalog-list {
    grid-template-columns: 1fr;
  }

  .artifact-card--feature {
    min-height: 28rem;
  }

  .document-layout {
    grid-template-columns: 1fr;
  }

  .doc-sidebar {
    position: static;
    max-height: none;
    padding: 1rem;
    border-radius: 12px;
    background: var(--surface);
  }

  .doc-sidebar nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .site-header__inner,
  .container,
  .document-layout,
  .site-footer__inner {
    width: min(calc(100% - 1.5rem), var(--content));
  }

  .brand small {
    display: none;
  }

  .header-actions {
    gap: 0.35rem;
  }

  .hero {
    padding: 3.25rem 0;
  }

  .hero h1 {
    font-size: clamp(3rem, 17vw, 4.4rem);
  }

  .prototype-window {
    min-height: 20rem;
  }

  .prototype-window__viewport {
    height: 20rem;
  }

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

  .stat:nth-child(3) {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .stat:nth-child(4) {
    border-top: 1px solid var(--line);
  }

  .collection-grid,
  .search-results {
    grid-template-columns: 1fr;
  }

  .search-form {
    grid-template-columns: 1fr;
  }

  .search-form .button {
    width: 100%;
  }

  .doc-sidebar nav {
    grid-template-columns: 1fr;
  }

  .doc-content table {
    display: block;
    overflow-x: auto;
  }

  .site-footer__inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

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

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