/* ---------------------------------------------------------------------------
   fuzgit — docs site stylesheet
   Plain CSS. No build step, no external requests (no CDN, no web fonts).
   Dark is the primary palette; light is provided via prefers-color-scheme.
   --------------------------------------------------------------------------- */

:root {
  color-scheme: dark light;

  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;
  --font-ui: system-ui, -apple-system, "Segoe UI", "Hiragino Sans",
    "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;

  /* dark (default) */
  --bg: #0e1013;
  --bg-elev: #14171c;
  --bg-code: #101318;
  --fg: #d5dbe3;
  --fg-strong: #f2f5f9;
  --muted: #8a94a3;
  --border: #262b33;
  --border-soft: #1c2027;
  --accent: #8fd3a3;
  --accent-dim: #5f9c73;
  --amber: #d9ae6b;
  --sel-bg: #1b2a33;
  --sel-bar: #8fd3a3;
  --link: #9dc6ff;

  --radius: 6px;
  --measure: 74ch;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #fbfaf7;
    --bg-elev: #ffffff;
    --bg-code: #f4f3ef;
    --fg: #22262c;
    --fg-strong: #0d1014;
    --muted: #5c6672;
    --border: #dfdcd4;
    --border-soft: #e9e6df;
    --accent: #1f7a4d;
    --accent-dim: #2f8a5c;
    --amber: #8a5a12;
    --sel-bg: #e7eef3;
    --sel-bar: #1f7a4d;
    --link: #14539a;
  }
}

/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.75;
  -webkit-text-size-adjust: 100%;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-mono);
  color: var(--fg-strong);
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 1.9rem;
  margin: 0 0 0.6rem;
}

h2 {
  font-size: 1.35rem;
  margin: 3.2rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

h3 {
  font-size: 1.08rem;
  margin: 2.2rem 0 0.7rem;
}

h4 {
  font-size: 0.98rem;
  margin: 1.6rem 0 0.5rem;
  color: var(--fg);
}

p,
ul,
ol {
  max-width: var(--measure);
}

a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--link) 35%, transparent);
}

a:hover {
  border-bottom-color: var(--link);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

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

:not(pre) > code {
  background: var(--bg-code);
  border: 1px solid var(--border-soft);
  border-radius: 3px;
  padding: 0.08em 0.35em;
  font-size: 0.88em;
  white-space: nowrap;
}

kbd {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0.05em 0.4em;
  font-size: 0.85em;
  white-space: nowrap;
}

pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.6;
  tab-size: 2;
}

pre code {
  background: none;
  border: 0;
  padding: 0;
  font-size: inherit;
  white-space: pre;
}

blockquote {
  margin: 1.2rem 0;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid var(--amber);
  color: var(--muted);
  max-width: var(--measure);
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

strong {
  color: var(--fg-strong);
  font-weight: 600;
}

.muted {
  color: var(--muted);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--bg-elev);
  color: var(--fg-strong);
  padding: 0.6rem 1rem;
  border: 1px solid var(--accent);
  z-index: 100;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

/* --------------------------------------------------------------------------
   Tables
   -------------------------------------------------------------------------- */

.table-wrap {
  overflow-x: auto;
  margin: 1.2rem 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.9rem;
  min-width: 34rem;
}

th,
td {
  text-align: left;
  vertical-align: top;
  padding: 0.55rem 0.9rem;
  border-bottom: 1px solid var(--border-soft);
}

thead th {
  background: var(--bg-elev);
  color: var(--fg-strong);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

tbody tr:last-child td {
  border-bottom: 0;
}

tbody tr:hover {
  background: var(--sel-bg);
}

td code,
th code {
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   Terminal mock
   -------------------------------------------------------------------------- */

.term {
  margin: 0 0 1.4rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-code);
  overflow: hidden;
}

.term-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 0.8rem;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
}

.term-bar::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-dim);
  flex: none;
}

.term pre {
  border: 0;
  border-radius: 0;
  margin: 0;
  background: none;
  padding: 0.9rem 1rem;
}

.term figcaption {
  border-top: 1px dashed var(--border);
  padding: 0.7rem 1rem;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.6;
}

.term figcaption b {
  color: var(--fg);
  font-weight: 600;
}

.prompt {
  color: var(--accent);
}

.cmd {
  color: var(--fg-strong);
}

.sel {
  display: inline-block;
  width: 100%;
  background: var(--sel-bg);
  box-shadow: inset 2px 0 0 var(--sel-bar);
  color: var(--fg-strong);
}

.hint {
  color: var(--muted);
}

.ok {
  color: var(--accent);
}

.warn {
  color: var(--amber);
}

.caret {
  background: var(--accent);
  color: var(--bg);
}

/* --------------------------------------------------------------------------
   Landing page
   -------------------------------------------------------------------------- */

.wrap {
  max-width: 62rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 3.4rem;
}

.brand {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--fg-strong);
  border: 0;
  font-size: 1rem;
}

.brand::before {
  content: "> ";
  color: var(--accent);
}

.nav-inline {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.hero {
  padding: 4rem 0 3rem;
  border-bottom: 1px solid var(--border);
}

.hero h1 {
  font-size: clamp(2.4rem, 8vw, 3.6rem);
  letter-spacing: -0.03em;
  margin-bottom: 0.4rem;
}

.hero h1::before {
  content: "> ";
  color: var(--accent);
  opacity: 0.75;
}

.tagline {
  font-size: clamp(1.05rem, 3vw, 1.3rem);
  color: var(--fg-strong);
  margin: 0 0 1rem;
  max-width: 42ch;
}

.lede {
  color: var(--muted);
  max-width: 62ch;
  margin: 0 0 1.6rem;
}

.binary-note {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--muted);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 0.5rem 0.8rem;
  display: inline-block;
  margin: 0 0 1.8rem;
  max-width: 100%;
  overflow-x: auto;
}

.binary-note b {
  color: var(--accent);
  font-weight: 600;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  color: var(--fg-strong);
  background: var(--bg-elev);
  text-decoration: none;
}

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

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #0e1013;
  font-weight: 600;
}

.btn-primary:hover {
  background: var(--accent-dim);
  border-color: var(--accent-dim);
  color: #0e1013;
}

.btn svg {
  width: 1em;
  height: 1em;
  fill: currentColor;
  flex: none;
}

section.band {
  padding: 3rem 0;
  border-bottom: 1px solid var(--border);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.4rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: 1.5rem;
}

.feature {
  background: var(--bg);
  padding: 1.3rem 1.2rem;
}

.feature h3 {
  margin: 0 0 0.4rem;
  font-size: 0.98rem;
}

.feature h3::before {
  content: "▸ ";
  color: var(--accent);
}

.feature p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
  max-width: none;
}

.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

@media (max-width: 800px) {
  .two-col {
    grid-template-columns: minmax(0, 1fr);
  }
}

.site-footer {
  padding: 2.5rem 0 3.5rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.5rem;
  align-items: center;
  justify-content: space-between;
}

/* --------------------------------------------------------------------------
   Language switch
   -------------------------------------------------------------------------- */

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  font-family: var(--font-mono);
  flex: none;
}

.lang-switch button {
  appearance: none;
  border: 0;
  background: var(--bg-elev);
  color: var(--muted);
  font: inherit;
  font-size: 0.8rem;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
}

.lang-switch button + button {
  border-left: 1px solid var(--border);
}

.lang-switch button[aria-pressed="true"] {
  background: var(--sel-bg);
  color: var(--fg-strong);
}

/* Default (also the no-JS fallback): English is shown, Japanese is hidden.

   All three rules are scoped under `body` on purpose: <html> itself carries
   lang="en"/lang="ja" so assistive technology reads the document in the right
   language, and an unscoped [lang="ja"] would match the root element and hide
   the entire page. Keeping `body` in every selector also preserves the
   specificity order (default 0,1,1 < data-lang overrides 0,2,2). */
body [lang="ja"] {
  display: none;
}

html[data-lang="ja"] body [lang="ja"] {
  display: revert;
}

html[data-lang="ja"] body [lang="en"] {
  display: none;
}

/* --------------------------------------------------------------------------
   Docs layout
   -------------------------------------------------------------------------- */

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

.docs-header .wrap {
  max-width: 82rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  min-height: 3.4rem;
}

.docs-header .spacer {
  flex: 1;
}

.docs-layout {
  max-width: 82rem;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: grid;
  grid-template-columns: 16.5rem minmax(0, 1fr);
  gap: 2.5rem;
  align-items: start;
}

.toc {
  position: sticky;
  top: 3.4rem;
  max-height: calc(100vh - 3.4rem);
  overflow-y: auto;
  padding: 1.5rem 0 3rem;
  font-size: 0.85rem;
  border-right: 1px solid var(--border-soft);
}

.toc h2 {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  border: 0;
  margin: 1.4rem 0 0.4rem;
  padding: 0;
}

.toc h2:first-child {
  margin-top: 0;
}

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

.toc li {
  margin: 0;
}

.toc a {
  display: block;
  padding: 0.22rem 0.7rem;
  color: var(--muted);
  border: 0;
  border-left: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  overflow-wrap: anywhere;
}

.toc a:hover {
  color: var(--fg-strong);
  background: var(--bg-elev);
}

.toc a.current {
  color: var(--fg-strong);
  border-left-color: var(--accent);
  background: var(--sel-bg);
}

.docs-main {
  padding: 2rem 0 5rem;
  min-width: 0;
}

.docs-main > h1 {
  margin-top: 0;
}

.docs-main section {
  scroll-margin-top: 4.5rem;
}

.docs-main h2 a.anchor,
.docs-main h3 a.anchor {
  color: var(--muted);
  border: 0;
  opacity: 0;
  margin-left: 0.4rem;
  font-weight: 400;
}

.docs-main h2:hover a.anchor,
.docs-main h3:hover a.anchor,
a.anchor:focus-visible {
  opacity: 1;
}

.toc-toggle {
  display: none;
  appearance: none;
  font: inherit;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--bg-elev);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.3rem 0.7rem;
  cursor: pointer;
}

@media (max-width: 900px) {
  .docs-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .toc-toggle {
    display: inline-block;
  }

  .toc {
    position: static;
    max-height: none;
    border-right: 0;
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
  }

  .toc[hidden] {
    display: none;
  }

  .toc a {
    padding: 0.3rem 0.7rem;
  }
}

/* --------------------------------------------------------------------------
   Small print
   -------------------------------------------------------------------------- */

.note {
  border: 1px solid var(--border);
  border-left: 3px solid var(--amber);
  border-radius: var(--radius);
  background: var(--bg-elev);
  padding: 0.8rem 1rem;
  margin: 1.2rem 0;
  font-size: 0.9rem;
  max-width: var(--measure);
}

.note p {
  margin: 0.3rem 0;
}

.note p:first-child {
  margin-top: 0;
}

.note p:last-child {
  margin-bottom: 0;
}

.term.spaced {
  margin-top: 1.4rem;
}

.table-caption {
  text-align: left;
  padding: 0.6rem 0.9rem;
  color: var(--muted);
  font-size: 0.82rem;
}