/* =========================================================
   arc: Documentation ("arc wiki") Stylesheet
   Modern CAD design matching the arc application:
   Deep graphite surfaces, crisp hairlines, precision pill badges,
   matte contrast, and clean engineering typography.
   No pulsing lights, no glowing shadows, no neon halos.
   Deeply optimized for mobile and touch devices.
   ========================================================= */

:root {
  --bg-app: #12141a;
  --bg-surface: #171a22;
  --bg-surface-elevated: #1e222d;
  --bg-surface-soft: #232836;
  --bg-card: rgba(23, 26, 34, 0.88);
  --bg-panel: #161922;

  --line: #262c3a;
  --line-strong: #3b455c;
  --line-soft: rgba(255, 255, 255, 0.06);

  --ink: #dce4f2;
  --ink-bright: #ffffff;
  --ink-soft: #94a3b8;
  --ink-faint: #64748b;

  --accent: #00e8ff;
  --accent-hover: #53f0ff;
  --accent-ink: #00b8d8;
  --accent-soft: rgba(0, 232, 255, 0.08);

  --shadow: 0 16px 36px -12px rgba(0, 0, 0, 0.65);
  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.45);

  --kbd-bg: #1c202a;
  --kbd-border: #313a4d;
  --kbd-text: #dce4f2;

  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;

  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-app: #0e1015;
    --bg-surface: #161922;
    --bg-surface-elevated: #1d212c;
    --bg-card: rgba(22, 25, 34, 0.92);
  }
}

* {
  box-sizing: border-box;
  max-width: 100%;
}

html, body {
  overflow-x: hidden;
  width: 100%;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg-app);
}

body {
  margin: 0;
  background-color: var(--bg-app);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--accent);
  color: #0b0e14;
}

.wrap {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3, h4 {
  margin: 0;
  color: var(--ink-bright);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 140ms ease;
}
a:hover {
  color: var(--accent-hover);
}

.mono { font-family: var(--mono); font-size: 0.9em; }
code { font-family: var(--mono); font-size: 0.88em; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---------------- header ---------------- */

header.site {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(18, 20, 26, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.02em;
  color: var(--ink-bright);
  text-decoration: none;
  flex-shrink: 0;
}

.brand img {
  display: block;
  width: 24px;
  height: 24px;
}

.docs-badge {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--line);
  padding: 2px 7px 1px;
  border-radius: 999px;
  margin-left: 5px;
}

nav.top {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

nav.top a {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-soft);
  padding: 6px 10px;
  border-radius: 6px;
  transition: all 120ms ease;
  display: inline-flex;
  align-items: center;
}

nav.top a:hover {
  color: var(--ink-bright);
  background: rgba(255, 255, 255, 0.06);
}

nav.top a[aria-current="page"] {
  color: var(--accent);
  background: var(--bg-surface-elevated);
}

nav.top a.gh {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--ink-bright);
  border: 1px solid var(--line);
  background: var(--bg-surface);
}
nav.top a.gh:hover {
  background: var(--bg-surface-elevated);
  border-color: var(--line-strong);
  color: #ffffff;
}

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

.layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 52px;
  align-items: start;
  padding-top: 40px;
  padding-bottom: 72px;
}

/* ---------------- toc (sidebar navigation) ---------------- */

.toc {
  position: sticky;
  top: 88px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  background: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 14px;
  box-shadow: var(--shadow-sm);
}

.toc-details {
  background: transparent;
  border: none;
  width: 100%;
}

.toc-summary {
  display: none;
}

.toc .label {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 14px 0 6px;
  padding: 0 8px 6px;
  border-bottom: 1px solid var(--line);
}

.toc .label:first-child {
  margin-top: 0;
  counter-reset: toc;
}

.toc a {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--sans);
  font-size: 13.5px;
  font-weight: 500;
  text-decoration: none;
  color: var(--ink-soft);
  padding: 6px 10px;
  border-radius: 6px;
  transition: all 120ms ease;
}

.toc a::before {
  content: counter(toc, decimal-leading-zero);
  counter-increment: toc;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  color: var(--ink-faint);
  min-width: 18px;
}

.toc a[href^="#"] {
  color: var(--ink-faint);
  font-size: 13px;
  padding-left: 24px;
}

.toc a[href^="#"]::before {
  content: "·";
  counter-increment: none;
  min-width: 0;
  color: var(--accent);
}

.toc a[href^="#"]:hover {
  color: var(--ink-bright);
}

.toc a:hover {
  color: var(--ink-bright);
  background: rgba(255, 255, 255, 0.05);
}

.toc a.on {
  color: var(--accent);
  background: var(--bg-surface-elevated);
  font-weight: 600;
}

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

/* ---------------- prose / main content ---------------- */

.page h1 {
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(2.2rem, 4.4vw, 3.2rem);
  letter-spacing: -0.035em;
  line-height: 1.1;
  color: var(--ink-bright);
}

.subline {
  max-width: 68ch;
  margin: 16px 0 10px;
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.65;
}

.subline strong {
  color: var(--ink-bright);
}

.doc {
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  max-width: 74ch;
}

.page > .doc:first-of-type {
  border-top: 1px solid var(--line-strong);
}

.doc h2 {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  color: var(--ink-bright);
  counter-increment: figure;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.doc h2::before {
  content: counter(figure, decimal-leading-zero) " · ";
  font-family: var(--mono);
  font-size: 0.85em;
  color: var(--accent);
  counter-reset: none;
}

.page { counter-reset: figure; }

.doc p {
  margin: 0 0 16px;
  color: var(--ink);
  line-height: 1.68;
}
.doc p:last-child { margin-bottom: 0; }

.doc ul {
  margin: 0 0 16px;
  padding-left: 22px;
  color: var(--ink);
}

.doc li {
  margin-bottom: 8px;
}

.doc strong {
  color: var(--ink-bright);
}

h3 {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.015em;
  color: var(--ink-bright);
  margin: 24px 0 12px;
}

/* ---------------- overview cards ---------------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 16px;
  margin-top: 10px;
}

.card {
  display: flex;
  flex-direction: column;
  padding: 22px;
  background: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  text-decoration: none;
  transition: all 160ms ease;
  box-shadow: var(--shadow-sm);
}

.card:hover {
  background: var(--bg-surface-elevated);
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.card .t {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 16px;
  color: var(--ink-bright);
  margin-bottom: 8px;
}

.card:hover .t {
  color: var(--accent);
}

.card .no {
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 700;
  color: var(--accent);
  background: var(--bg-surface-elevated);
  padding: 1px 6px;
  border-radius: 4px;
}

.card .d {
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-soft);
}

/* ---------------- tables ---------------- */

.tbl {
  width: 100%;
  max-width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 22px 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg-surface);
  font-size: 14.5px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tbl caption {
  caption-side: top;
  text-align: left;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 8px;
  padding-left: 2px;
}

.tbl th {
  background: rgba(18, 20, 26, 0.7);
  padding: 11px 16px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.tbl td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  vertical-align: middle;
}

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

.tbl tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.tbl .keys {
  white-space: nowrap;
}

/* ---------------- keyboards & code ---------------- */

kbd {
  font-family: var(--mono);
  font-size: 0.85em;
  font-weight: 700;
  padding: 2px 7px;
  border: 1px solid var(--kbd-border);
  border-radius: 5px;
  background: var(--kbd-bg);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
  color: var(--kbd-text);
  display: inline-block;
}

pre.code, figure.code {
  margin: 18px 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg-surface);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  max-width: 100%;
}

pre.code code {
  display: block;
  padding: 16px 20px;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--ink);
  white-space: pre;
}

pre.code .k { color: #f2974c; font-weight: 600; }
pre.code .c { color: #64748b; font-style: italic; }
pre.code .fn { color: #53f0ff; }
pre.code .str { color: #86efac; }

.note {
  margin: 22px 0;
  padding: 16px 18px;
  border-left: 3px solid var(--accent);
  background: var(--bg-surface);
  border-radius: 0 8px 8px 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.note strong {
  color: var(--ink-bright);
}

/* ---------------- footer ---------------- */

footer.site {
  background: var(--bg-surface);
  border-top: 1px solid var(--line);
  padding: 36px 0;
  margin-top: 60px;
}

footer.site .wrap {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

footer.site .who {
  font-size: 14.5px;
  color: var(--ink-soft);
}

footer.site .right {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

footer.site .right a {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-soft);
}

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

footer.site .legal {
  font-size: 12.5px;
  color: var(--ink-faint);
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

footer.site .legal a {
  color: var(--ink-soft);
}

/* ---------------- responsive optimization ---------------- */

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 24px;
    padding-bottom: 48px;
  }
  .toc {
    position: static;
    padding: 0;
    background: transparent;
    border: none;
    box-shadow: none;
  }
  .toc-details {
    background: var(--bg-surface);
    border: 1px solid var(--line);
    border-radius: 10px;
    overflow: hidden;
  }
  .toc-summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    font-family: var(--mono);
    font-size: 12.5px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--ink-bright);
    cursor: pointer;
    background: var(--bg-surface-elevated);
    list-style: none;
    user-select: none;
  }
  .toc-summary::-webkit-details-marker {
    display: none;
  }
  .toc-summary::after {
    content: "▾";
    font-size: 12px;
    color: var(--accent);
    transition: transform 160ms ease;
  }
  .toc-details[open] .toc-summary::after {
    transform: rotate(180deg);
  }
  .toc-content {
    padding: 12px 14px;
  }
}

@media (min-width: 901px) {
  .toc-summary {
    display: none !important;
  }
  .toc-content {
    display: block !important;
  }
}

@media (max-width: 768px) {
  .wrap {
    padding: 0 16px;
  }
  header.site .wrap {
    flex-direction: column;
    align-items: stretch;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    min-height: auto;
  }
  nav.top {
    display: flex;
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    gap: 6px;
    margin: 0 -4px;
    padding: 2px 2px 4px;
  }
  nav.top::-webkit-scrollbar {
    display: none;
  }
  nav.top a {
    flex: 0 0 auto;
    white-space: nowrap;
    font-size: 11.5px;
    padding: 5px 9px;
  }
  .page h1 {
    font-size: clamp(1.85rem, 6.5vw, 2.4rem);
    line-height: 1.15;
  }
  .subline {
    font-size: 15px;
    margin: 12px 0 8px;
  }
  .doc {
    margin-top: 36px;
    padding-top: 20px;
  }
  .doc h2 {
    font-size: 1.35rem;
  }
  .cards {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .card {
    padding: 16px 18px;
  }
  .tbl {
    display: block;
    width: 100%;
    font-size: 13px;
    margin: 16px 0;
  }
  .tbl th, .tbl td {
    padding: 9px 12px;
    white-space: nowrap;
  }
  .tbl td:last-child {
    white-space: normal;
    min-width: 160px;
  }
  pre.code code {
    font-size: 12px;
    padding: 12px 14px;
    line-height: 1.55;
    white-space: pre-wrap;
    word-break: break-word;
    overflow-wrap: anywhere;
  }
  .note {
    padding: 12px 14px;
    font-size: 13.5px;
    margin: 16px 0;
  }
  footer.site {
    padding: 28px 0;
    margin-top: 40px;
  }
}