:root {
  color-scheme: dark;
  --bg: #07100f;
  --bg-soft: #0b1715;
  --surface: #0e1d1a;
  --surface-2: #13241f;
  --line: #263c35;
  --line-strong: #3c5b50;
  --text: #edf7f1;
  --muted: #9cb1a8;
  --accent: #71f6b5;
  --accent-2: #80cfff;
  --warning: #ffc66d;
  --danger: #ff8f8f;
  --shadow: 0 24px 80px rgb(0 0 0 / 0.34);
  --radius: 14px;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f5f8f6;
  --bg-soft: #edf3ef;
  --surface: #ffffff;
  --surface-2: #f2f7f4;
  --line: #d2ddd7;
  --line-strong: #a9bbb2;
  --text: #10251e;
  --muted: #587067;
  --accent: #087d4c;
  --accent-2: #006da3;
  --warning: #9b5d00;
  --danger: #b52f38;
  --shadow: 0 24px 70px rgb(34 66 52 / 0.15);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 70% -10%, color-mix(in srgb, var(--accent) 13%, transparent), transparent 35rem),
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
  text-decoration-color: color-mix(in srgb, var(--accent) 55%, transparent);
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--accent);
}

button,
input {
  color: inherit;
  font: inherit;
}

button {
  cursor: pointer;
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent-2) 75%, transparent);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.6rem;
  left: 0.6rem;
  padding: 0.7rem 1rem;
  transform: translateY(-180%);
  border-radius: 8px;
  background: var(--accent);
  color: #05100c;
  font-weight: 800;
}

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

.reading-progress {
  position: fixed;
  z-index: 90;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.topbar {
  position: sticky;
  z-index: 50;
  top: 0;
  display: grid;
  grid-template-columns: 17.5rem minmax(15rem, 44rem) auto;
  gap: 1rem;
  align-items: center;
  min-height: 4.4rem;
  padding: 0.65rem 1.25rem;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  gap: 0.7rem;
  align-items: center;
  width: fit-content;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.96rem;
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  border: 1px solid color-mix(in srgb, var(--accent) 55%, var(--line));
  border-radius: 9px;
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  color: var(--accent);
  box-shadow: inset 0 0 18px color-mix(in srgb, var(--accent) 8%, transparent);
}

.brand span:last-child {
  color: var(--muted);
  font-weight: 500;
}

.top-actions {
  display: flex;
  gap: 0.55rem;
  justify-content: flex-end;
  align-items: center;
}

.topbar > .top-actions:first-child {
  justify-content: flex-start;
}

.icon-button,
.small-button {
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
}

.icon-button {
  display: none;
  width: 2.65rem;
  height: 2.65rem;
  place-items: center;
}

.small-button {
  padding: 0.52rem 0.8rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.76rem;
}

.small-button:hover,
.icon-button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.search-wrap {
  position: relative;
}

.search-input {
  width: 100%;
  min-height: 2.75rem;
  padding: 0.65rem 0.9rem 0.65rem 2.55rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
}

.search-input:focus {
  border-color: var(--accent-2);
}

.search-wrap::before {
  position: absolute;
  z-index: 1;
  top: 0.74rem;
  left: 0.92rem;
  color: var(--muted);
  content: ">_";
  font-family: var(--mono);
  font-size: 0.8rem;
  pointer-events: none;
}

.search-results {
  position: absolute;
  z-index: 80;
  top: calc(100% + 0.5rem);
  right: 0;
  left: 0;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.search-results a {
  display: grid;
  gap: 0.16rem;
  padding: 0.75rem 0.9rem;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}

.search-results a:last-child {
  border-bottom: 0;
}

.search-results a:hover,
.search-results a:focus {
  background: var(--surface-2);
}

.search-results strong {
  font-family: var(--mono);
  font-size: 0.85rem;
}

.search-results span,
.search-empty {
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1.4;
}

.search-empty {
  margin: 0;
  padding: 0.9rem;
}

.layout {
  display: grid;
  grid-template-columns: 17.5rem minmax(0, 1fr);
  min-height: calc(100vh - 4.4rem);
}

.sidebar {
  position: sticky;
  top: 4.4rem;
  overflow-y: auto;
  height: calc(100vh - 4.4rem);
  padding: 1.2rem 1rem 2rem;
  border-right: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg-soft) 88%, transparent);
}

.sidebar-head {
  display: none;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.nav-section {
  margin-bottom: 1.5rem;
}

.nav-section-title {
  margin: 0 0 0.42rem;
  padding: 0 0.58rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.nav-list {
  display: grid;
  gap: 0.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list a {
  display: flex;
  gap: 0.55rem;
  align-items: center;
  min-height: 2.1rem;
  padding: 0.38rem 0.6rem;
  border-radius: 8px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.35;
  text-decoration: none;
}

.nav-list a::before {
  color: var(--line-strong);
  content: "·";
}

.nav-list a:hover,
.nav-list a.active {
  background: var(--surface-2);
  color: var(--text);
}

.nav-list a.active::before {
  color: var(--accent);
  content: "›";
}

.main {
  min-width: 0;
}

.content {
  width: min(100% - 3rem, 76rem);
  margin: 0 auto;
  padding: 3.8rem 0 6rem;
}

.content.narrow {
  width: min(100% - 3rem, 66rem);
}

.eyebrow,
.breadcrumb {
  margin: 0 0 1rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.13;
}

h1 {
  max-width: 15ch;
  margin-bottom: 1.2rem;
  font-size: clamp(2.5rem, 7vw, 5.3rem);
  letter-spacing: -0.06em;
}

h2 {
  margin-bottom: 1rem;
  font-size: clamp(1.55rem, 3vw, 2.3rem);
  letter-spacing: -0.035em;
}

h3 {
  margin-bottom: 0.65rem;
  font-size: 1.05rem;
}

.lead {
  max-width: 64ch;
  margin: 0 0 2rem;
  color: var(--muted);
  font-size: clamp(1.06rem, 2vw, 1.28rem);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(18rem, 0.6fr);
  gap: 3rem;
  align-items: end;
  padding-bottom: 3.4rem;
}

.hero-code {
  position: relative;
  overflow: hidden;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, var(--surface), var(--bg-soft));
  box-shadow: var(--shadow);
  font-family: var(--mono);
  font-size: 0.78rem;
}

.hero-code::after {
  position: absolute;
  right: -1.5rem;
  bottom: -3rem;
  width: 9rem;
  height: 9rem;
  border-radius: 50%;
  background: var(--accent);
  content: "";
  filter: blur(70px);
  opacity: 0.2;
}

.hero-code p {
  margin: 0.38rem 0;
}

.token-comment { color: #7f9d90; }
.token-key { color: var(--accent-2); }
.token-value { color: var(--accent); }

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 2.85rem;
  padding: 0.65rem 1rem;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  background: var(--surface);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 800;
  text-decoration: none;
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #06110d;
}

.button:hover {
  transform: translateY(-1px);
}

.stat-grid,
.module-grid,
.path-grid,
.principle-grid {
  display: grid;
  gap: 1rem;
}

.stat-grid {
  grid-template-columns: repeat(4, 1fr);
  margin: 0 0 5rem;
}

.stat {
  padding: 1.1rem;
  border-top: 1px solid var(--line-strong);
}

.stat strong {
  display: block;
  margin-bottom: 0.2rem;
  font-family: var(--mono);
  font-size: 1.7rem;
}

.stat span {
  color: var(--muted);
  font-size: 0.8rem;
}

.section {
  margin-top: 5rem;
}

.section-head {
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  align-items: end;
  margin-bottom: 1.5rem;
}

.section-head p {
  max-width: 48ch;
  margin: 0;
  color: var(--muted);
}

.module-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.module-card,
.path-card,
.principle-card,
.info-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface) 84%, transparent);
}

.module-card {
  display: flex;
  min-height: 15rem;
  flex-direction: column;
  padding: 1.15rem;
  transition: border-color 150ms ease, transform 150ms ease;
}

.module-card:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
}

.module-card[hidden] {
  display: none;
}

.card-top,
.module-meta,
.status-row {
  display: flex;
  gap: 0.5rem;
  justify-content: space-between;
  align-items: center;
}

.index-no {
  color: var(--line-strong);
  font-family: var(--mono);
  font-size: 0.7rem;
}

.tag,
.status {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 1.55rem;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.61rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.status.stable { border-color: color-mix(in srgb, var(--accent) 50%, var(--line)); color: var(--accent); }
.status.partial { border-color: color-mix(in srgb, var(--warning) 50%, var(--line)); color: var(--warning); }
.status.prototype { border-color: color-mix(in srgb, var(--accent-2) 50%, var(--line)); color: var(--accent-2); }
.status.stub { border-color: color-mix(in srgb, var(--danger) 50%, var(--line)); color: var(--danger); }

.module-card h3 {
  margin-top: 1.25rem;
  font-family: var(--mono);
  font-size: 1rem;
  overflow-wrap: anywhere;
}

.module-card p {
  margin: 0 0 1.2rem;
  color: var(--muted);
  font-size: 0.86rem;
}

.module-card .card-link {
  margin-top: auto;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 800;
  text-decoration: none;
}

.module-card .card-link::after {
  content: "  →";
}

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

.path-card,
.principle-card {
  padding: 1.35rem;
}

.path-card .step {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.path-card p,
.principle-card p,
.info-card p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.directory-tools {
  display: grid;
  gap: 1rem;
  margin: 2.2rem 0 1.4rem;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.filter-button {
  padding: 0.42rem 0.72rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.filter-button:hover,
.filter-button.active {
  border-color: var(--accent);
  color: var(--accent);
}

.result-count {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.75rem;
}

.module-header {
  padding-bottom: 2.6rem;
  border-bottom: 1px solid var(--line);
}

.module-header h1 {
  max-width: none;
  margin: 0.5rem 0 1rem;
  font-family: var(--mono);
  font-size: clamp(2.1rem, 6vw, 4.5rem);
  overflow-wrap: anywhere;
}

.package-name {
  margin: 0 0 1rem;
  color: var(--accent-2);
  font-family: var(--mono);
  font-size: 0.78rem;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 14rem;
  gap: 4rem;
  align-items: start;
}

.article {
  min-width: 0;
}

.article section {
  padding-top: 3.4rem;
}

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

.article p {
  color: color-mix(in srgb, var(--text) 82%, var(--muted));
}

.toc {
  position: sticky;
  top: 6.3rem;
  padding-top: 3.4rem;
}

.toc strong {
  display: block;
  margin-bottom: 0.6rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
}

.toc a {
  display: block;
  padding: 0.3rem 0;
  color: var(--muted);
  font-size: 0.76rem;
  text-decoration: none;
}

.toc a:hover { color: var(--accent); }

.flow-list,
.recipe-list,
.plain-list {
  margin: 1.2rem 0;
  padding: 0;
  list-style: none;
  counter-reset: item;
}

.flow-list li,
.recipe-list li {
  position: relative;
  margin-left: 1.05rem;
  padding: 0 0 1.25rem 2.1rem;
  border-left: 1px solid var(--line-strong);
  counter-increment: item;
}

.flow-list li:last-child,
.recipe-list li:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.flow-list li::before,
.recipe-list li::before {
  position: absolute;
  top: -0.12rem;
  left: -0.84rem;
  display: grid;
  place-items: center;
  width: 1.6rem;
  height: 1.6rem;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--bg);
  color: var(--accent);
  content: counter(item, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 0.58rem;
  font-weight: 800;
}

.api-list {
  display: grid;
  gap: 0.7rem;
  margin: 1.2rem 0;
}

.api-item {
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
}

.api-item code {
  color: var(--accent-2);
  font-family: var(--mono);
  font-size: 0.8rem;
  overflow-wrap: anywhere;
}

.api-item span {
  display: block;
  margin-top: 0.28rem;
  color: var(--muted);
  font-size: 0.79rem;
}

.code-block {
  position: relative;
  overflow: hidden;
  margin: 1.35rem 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #06100d;
  box-shadow: inset 0 1px rgb(255 255 255 / 0.03);
}

.code-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 2.5rem;
  padding: 0.4rem 0.75rem;
  border-bottom: 1px solid #21372f;
  color: #8eaaa0;
  font-family: var(--mono);
  font-size: 0.65rem;
}

.copy-button {
  padding: 0.26rem 0.5rem;
  border: 1px solid #2e493f;
  border-radius: 6px;
  background: #0c1a16;
  color: #a8beb6;
  font-family: var(--mono);
  font-size: 0.62rem;
}

pre {
  overflow-x: auto;
  margin: 0;
  padding: 1rem;
  color: #d9eee5;
  font-family: var(--mono);
  font-size: 0.76rem;
  line-height: 1.65;
  tab-size: 2;
}

.callout {
  margin: 1.3rem 0;
  padding: 1rem 1.1rem;
  border-left: 3px solid var(--warning);
  border-radius: 0 10px 10px 0;
  background: color-mix(in srgb, var(--warning) 7%, var(--surface));
}

.callout strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--warning);
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
}

.callout p {
  margin: 0;
  font-size: 0.85rem;
}

.plain-list li {
  position: relative;
  margin: 0.55rem 0;
  padding-left: 1.2rem;
}

.plain-list li::before {
  position: absolute;
  left: 0;
  color: var(--accent);
  content: "→";
  font-family: var(--mono);
}

.related-grid,
.principle-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.related-link {
  padding: 0.9rem;
  border: 1px solid var(--line);
  border-radius: 9px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.73rem;
  text-decoration: none;
}

.related-link:hover {
  border-color: var(--accent);
}

.footer {
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  padding: 1.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.74rem;
}

.overlay {
  display: none;
}

@media (max-width: 1050px) {
  .topbar {
    grid-template-columns: auto minmax(10rem, 1fr) auto;
  }

  .brand span:last-child {
    display: none;
  }

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

  .sidebar {
    position: fixed;
    z-index: 75;
    top: 0;
    left: 0;
    width: min(21rem, 88vw);
    height: 100vh;
    transform: translateX(-105%);
    border-right: 1px solid var(--line-strong);
    transition: transform 180ms ease;
    box-shadow: var(--shadow);
  }

  .sidebar-head {
    display: flex;
  }

  .nav-open .sidebar {
    transform: translateX(0);
  }

  .nav-open {
    overflow: hidden;
    height: 100vh;
  }

  .overlay {
    position: fixed;
    z-index: 70;
    inset: 0;
    background: rgb(0 0 0 / 0.62);
  }

  .nav-open .overlay {
    display: block;
  }

  .icon-button {
    display: grid;
  }

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

  .toc {
    display: none;
  }
}

@media (max-width: 780px) {
  .topbar {
    grid-template-columns: auto 1fr auto;
    gap: 0.55rem;
    padding: 0.6rem 0.75rem;
  }

  .topbar > .search-wrap {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .top-actions .small-button:first-child {
    display: none;
  }

  .content,
  .content.narrow {
    width: min(100% - 1.5rem, 76rem);
    padding-top: 2.4rem;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 1.8rem;
  }

  h1 {
    font-size: clamp(2.45rem, 15vw, 4rem);
  }

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

  .module-grid,
  .path-grid,
  .principle-grid,
  .related-grid {
    grid-template-columns: 1fr;
  }

  .section {
    margin-top: 3.8rem;
  }

  .section-head {
    display: block;
  }

  .footer {
    display: grid;
  }
}

@media (max-width: 430px) {
  .brand > strong {
    display: none;
  }

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

  .button-row .button {
    justify-content: center;
    width: 100%;
  }

  .module-header h1 {
    font-size: 2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}