/* Precept documentation — one stylesheet, no framework, no webfont. */

:root {
  --brand: #6667AB;
  --brand-strong: #54559A;
  --brand-soft: #eeeef7;

  --bg: #ffffff;
  --bg-soft: #f7f7fa;
  --bg-code: #f6f6f9;
  --text: #23232b;
  --text-soft: #5c5c6b;
  --text-faint: #85858f;
  --line: #e4e4ec;
  --line-soft: #eeeef2;
  --shadow: 0 10px 30px rgb(20 20 40 / 12%);

  --tok-comment: #7b7b8c;
  --tok-str: #2d7d5a;
  --tok-keyword: #6f3fbe;
  --tok-number: #b0562b;
  --tok-key: #1f6feb;
  --tok-attr: #9a5b1f;

  --sidebar: 250px;
  --toc: 200px;
  --measure: 46rem;

  --sans: ui-sans-serif, -apple-system, "Segoe UI", Roboto, Inter, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --brand: #9c9dda;
    --brand-strong: #b6b7e8;
    --brand-soft: #26263a;

    --bg: #16161c;
    --bg-soft: #1c1c24;
    --bg-code: #1e1e27;
    --text: #e5e5ec;
    --text-soft: #a8a8b8;
    --text-faint: #82828f;
    --line: #2c2c38;
    --line-soft: #24242e;
    --shadow: 0 10px 30px rgb(0 0 0 / 45%);

    --tok-comment: #7e7e92;
    --tok-str: #86d0a4;
    --tok-keyword: #c3a0ff;
    --tok-number: #f0a878;
    --tok-key: #8ab4f8;
    --tok-attr: #e0b070;
  }
}

:root[data-theme="dark"] {
  --brand: #9c9dda;
  --brand-strong: #b6b7e8;
  --brand-soft: #26263a;

  --bg: #16161c;
  --bg-soft: #1c1c24;
  --bg-code: #1e1e27;
  --text: #e5e5ec;
  --text-soft: #a8a8b8;
  --text-faint: #82828f;
  --line: #2c2c38;
  --line-soft: #24242e;
  --shadow: 0 10px 30px rgb(0 0 0 / 45%);

  --tok-comment: #7e7e92;
  --tok-str: #86d0a4;
  --tok-keyword: #c3a0ff;
  --tok-number: #f0a878;
  --tok-key: #8ab4f8;
  --tok-attr: #e0b070;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration-color: color-mix(in srgb, var(--brand) 35%, transparent); text-underline-offset: 2px; }
a:hover { color: var(--brand-strong); text-decoration-color: currentColor; }

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 1rem; top: 1rem; z-index: 100;
  background: var(--bg); padding: .5rem 1rem; border-radius: 8px; border: 1px solid var(--line);
}

/* ---------- top bar ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: .75rem;
  height: 3.5rem;
  padding: 0 1rem;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: .55rem;
  font-weight: 620;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
}
.brand img { border-radius: 6px; }

.version {
  font-family: var(--mono);
  font-size: .72rem;
  color: var(--text-soft);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .1rem .5rem;
}

.topbar svg {
  width: 18px; height: 18px;
  fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round;
}

.icon-button {
  display: grid;
  place-items: center;
  width: 2rem; height: 2rem;
  padding: 0;
  color: var(--text-soft);
  background: none;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}
.icon-button:hover { background: var(--bg-soft); color: var(--text); }

.menu { display: none; }

.search-open {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-left: auto;
  min-width: 13rem;
  padding: .35rem .5rem .35rem .6rem;
  color: var(--text-faint);
  font: inherit;
  font-size: .875rem;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 9px;
  cursor: pointer;
}
.search-open:hover { border-color: var(--brand); color: var(--text-soft); }
.search-open kbd { margin-left: auto; }

kbd {
  font-family: var(--mono);
  font-size: .7rem;
  color: var(--text-faint);
  background: var(--bg);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 0 .35rem;
}

.theme .moon { display: none; }
:root[data-theme="dark"] .theme .sun { display: none; }
:root[data-theme="dark"] .theme .moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme .sun { display: none; }
  :root:not([data-theme="light"]) .theme .moon { display: block; }
}

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

.layout {
  display: grid;
  grid-template-columns: var(--sidebar) minmax(0, 1fr) var(--toc);
  gap: 2.5rem;
  max-width: 88rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.sidebar, .toc {
  position: sticky;
  top: 3.5rem;
  align-self: start;
  max-height: calc(100vh - 3.5rem);
  overflow-y: auto;
  padding: 1.75rem 0 3rem;
  font-size: .875rem;
}

.sidebar nav ul { list-style: none; margin: 0 0 1.5rem; padding: 0; }
.sidebar nav li { margin: 0; }

.nav-group {
  margin: 0 0 .4rem;
  padding-left: .6rem;
  font-size: .72rem;
  font-weight: 660;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.sidebar nav a {
  display: block;
  padding: .25rem .6rem;
  border-left: 2px solid transparent;
  color: var(--text-soft);
  text-decoration: none;
  border-radius: 0 6px 6px 0;
}
.sidebar nav a:hover { color: var(--text); background: var(--bg-soft); }
.sidebar nav a.active {
  color: var(--brand);
  font-weight: 560;
  border-left-color: var(--brand);
  background: var(--brand-soft);
}

.toc { font-size: .82rem; }
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc a {
  display: block;
  padding: .2rem 0 .2rem .75rem;
  border-left: 2px solid var(--line);
  color: var(--text-soft);
  text-decoration: none;
}
.toc a:hover, .toc a.active { color: var(--brand); border-left-color: var(--brand); }
.toc-title {
  margin: 0 0 .5rem .75rem;
  font-size: .72rem;
  font-weight: 660;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--text-faint);
}

main { min-width: 0; padding: 2.25rem 0 4rem; }

/* ---------- prose ---------- */

.prose { max-width: var(--measure); }

.prose h1 {
  margin: 0 0 1.25rem;
  font-size: 2.15rem;
  line-height: 1.15;
  letter-spacing: -0.025em;
  font-weight: 700;
}
.prose h2 {
  margin: 3rem 0 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line-soft);
  font-size: 1.4rem;
  letter-spacing: -0.015em;
  font-weight: 660;
}
.prose h3 { margin: 2rem 0 .75rem; font-size: 1.1rem; font-weight: 640; }
.prose h4 { margin: 1.5rem 0 .5rem; font-size: .95rem; font-weight: 640; color: var(--text-soft); }

.prose h2 a.anchor, .prose h3 a.anchor { opacity: 0; margin-left: .4rem; text-decoration: none; font-weight: 400; }
.prose h2:hover a.anchor, .prose h3:hover a.anchor { opacity: .45; }

.prose p { margin: 0 0 1.1rem; }
.prose ul, .prose ol { margin: 0 0 1.1rem; padding-left: 1.35rem; }
.prose li { margin: .3rem 0; }
.prose li > p { margin-bottom: .5rem; }

.prose strong { font-weight: 640; }

.prose blockquote {
  margin: 1.5rem 0;
  padding: .9rem 1.1rem;
  border-left: 3px solid var(--brand);
  border-radius: 0 8px 8px 0;
  background: var(--bg-soft);
  color: var(--text-soft);
}
.prose blockquote > :last-child { margin-bottom: 0; }

.prose img { max-width: 100%; height: auto; }

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

/* code */

.prose :not(pre) > code {
  font-family: var(--mono);
  font-size: .855em;
  background: var(--bg-code);
  border: 1px solid var(--line-soft);
  border-radius: 5px;
  padding: .1em .35em;
  white-space: nowrap;
}

.prose pre {
  position: relative;
  margin: 0 0 1.35rem;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  background: var(--bg-code);
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: .855rem;
  line-height: 1.6;
  tab-size: 4;
}
.prose pre code { font-family: var(--mono); }

.prose pre[data-lang]::after {
  content: attr(data-lang);
  position: absolute;
  top: .45rem; right: .7rem;
  font-family: var(--mono);
  font-size: .68rem;
  color: var(--text-faint);
  pointer-events: none;
}

.tok-comment { color: var(--tok-comment); font-style: italic; }
.tok-str     { color: var(--tok-str); }
.tok-keyword { color: var(--tok-keyword); }
.tok-number  { color: var(--tok-number); }
.tok-key     { color: var(--tok-key); }
.tok-attr    { color: var(--tok-attr); }

/* tables */

.prose .table-wrap { overflow-x: auto; margin: 0 0 1.35rem; }

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
}
.prose th, .prose td {
  padding: .55rem .75rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line-soft);
}
.prose th {
  font-weight: 640;
  font-size: .78rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--text-faint);
  border-bottom: 1px solid var(--line);
}
.prose tbody tr:hover { background: var(--bg-soft); }
.prose td code { white-space: nowrap; }

/* home page cards */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: .9rem;
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
}
.cards li { margin: 0; }
.cards a {
  display: block;
  height: 100%;
  padding: .9rem 1rem;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 10px;
  text-decoration: none;
  color: var(--text);
}
.cards a:hover { border-color: var(--brand); background: var(--brand-soft); }
.cards strong { display: block; margin-bottom: .15rem; font-weight: 620; color: var(--brand); }
.cards span { font-size: .875rem; color: var(--text-soft); }

/* ---------- pager and footer ---------- */

.pager {
  display: flex;
  gap: 1rem;
  max-width: var(--measure);
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}
.pager a {
  flex: 1;
  padding: .7rem .9rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-weight: 560;
  text-decoration: none;
}
.pager a:hover { border-color: var(--brand); background: var(--bg-soft); }
.pager .next { text-align: right; margin-left: auto; }
.pager span { display: block; font-size: .74rem; font-weight: 500; color: var(--text-faint); }

main > footer {
  max-width: var(--measure);
  margin-top: 2.5rem;
  color: var(--text-faint);
  font-size: .82rem;
}

/* ---------- search ---------- */

dialog.search {
  width: min(38rem, calc(100vw - 2rem));
  margin-top: 8vh;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
}
dialog.search::backdrop { background: rgb(15 15 25 / 45%); backdrop-filter: blur(2px); }

.search-field {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .85rem 1rem;
  border-bottom: 1px solid var(--line);
}
.search-field svg {
  width: 18px; height: 18px; flex: none;
  fill: none; stroke: var(--text-faint); stroke-width: 1.6; stroke-linecap: round;
}
.search-field input {
  flex: 1;
  min-width: 0;
  font: inherit;
  font-size: 1rem;
  color: var(--text);
  background: none;
  border: 0;
  outline: none;
}

.results { list-style: none; margin: 0; padding: .4rem; max-height: 60vh; overflow-y: auto; }
.results li { margin: 0; }
.results a {
  display: block;
  padding: .5rem .7rem;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text);
}
.results a:hover, .results a:focus, .results .selected a { background: var(--brand-soft); outline: none; }
.results .r-title { font-weight: 580; }
.results .r-group { font-size: .72rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: .05em; }
.results .r-text { display: block; font-size: .82rem; color: var(--text-soft); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.results mark { background: color-mix(in srgb, var(--brand) 28%, transparent); color: inherit; border-radius: 3px; }

.search-empty { margin: 0; padding: 1.2rem; color: var(--text-faint); text-align: center; }

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

@media (max-width: 1180px) {
  .layout { grid-template-columns: var(--sidebar) minmax(0, 1fr); }
  .toc { display: none; }
}

@media (max-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr); gap: 0; padding: 0 1.25rem; }
  .menu { display: grid; }
  .version { display: none; }
  .search-open { min-width: 0; }
  .search-open span { display: none; }
  .search-open kbd { display: none; }

  .sidebar {
    position: fixed;
    top: 3.5rem;
    left: 0;
    bottom: 0;
    z-index: 45;
    width: 17rem;
    max-height: none;
    padding: 1.25rem 1rem 3rem;
    background: var(--bg);
    border-right: 1px solid var(--line);
    transform: translateX(-100%);
    transition: transform .18s ease;
  }
  body.nav-open .sidebar { transform: none; }
  body.nav-open .scrim {
    position: fixed;
    inset: 3.5rem 0 0;
    z-index: 44;
    background: rgb(15 15 25 / 35%);
  }

  .prose h1 { font-size: 1.8rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .sidebar { transition: none; }
}